^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * This file is provided under a dual BSD/GPLv2 license. When using or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * redistributing this file, you may do so under either license.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * GPL LICENSE SUMMARY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright(c) 2012 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This program is free software; you can redistribute it and/or modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * it under the terms of version 2 of the GNU General Public License as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * BSD LICENSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Copyright(c) 2012 Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Copyright (C) 2015 EMC Corporation. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Redistribution and use in source and binary forms, with or without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * modification, are permitted provided that the following conditions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * are met:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * * Redistributions of source code must retain the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * notice, this list of conditions and the following disclaimer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * * Redistributions in binary form must reproduce the above copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * notice, this list of conditions and the following disclaimer in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * the documentation and/or other materials provided with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * distribution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * * Neither the name of Intel Corporation nor the names of its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * contributors may be used to endorse or promote products derived
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * from this software without specific prior written permission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * PCIe NTB Transport Linux driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * Contact Information:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * Jon Mason <jon.mason@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/dmaengine.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include "linux/ntb.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include "linux/ntb_transport.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define NTB_TRANSPORT_VERSION 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define NTB_TRANSPORT_VER "4"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define NTB_TRANSPORT_NAME "ntb_transport"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define NTB_TRANSPORT_MIN_SPADS (MW0_SZ_HIGH + 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) MODULE_DESCRIPTION(NTB_TRANSPORT_DESC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) MODULE_VERSION(NTB_TRANSPORT_VER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) MODULE_LICENSE("Dual BSD/GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) MODULE_AUTHOR("Intel Corporation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static unsigned long max_mw_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) module_param(max_mw_size, ulong, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static unsigned int transport_mtu = 0x10000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) module_param(transport_mtu, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static unsigned char max_num_clients;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) module_param(max_num_clients, byte, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static unsigned int copy_bytes = 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) module_param(copy_bytes, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static bool use_dma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) module_param(use_dma, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static bool use_msi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #ifdef CONFIG_NTB_MSI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) module_param(use_msi, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) MODULE_PARM_DESC(use_msi, "Use MSI interrupts instead of doorbells");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static struct dentry *nt_debugfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* Only two-ports NTB devices are supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define PIDX NTB_DEF_PEER_IDX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct ntb_queue_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* ntb_queue list reference */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct list_head entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* pointers to data to be transferred */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) void *cb_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unsigned int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int retries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int errors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) unsigned int tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unsigned int rx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct ntb_payload_header __iomem *tx_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct ntb_payload_header *rx_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct ntb_rx_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned int entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct ntb_transport_qp {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct ntb_transport_ctx *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct ntb_dev *ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) void *cb_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct dma_chan *tx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct dma_chan *rx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) bool client_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) bool link_is_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) bool active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) u8 qp_num; /* Only 64 QP's are allowed. 0-63 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) u64 qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct ntb_rx_info __iomem *rx_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct ntb_rx_info *remote_rx_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) void *data, int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct list_head tx_free_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) spinlock_t ntb_tx_free_q_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) void __iomem *tx_mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) phys_addr_t tx_mw_phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) size_t tx_mw_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) dma_addr_t tx_mw_dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) unsigned int tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) unsigned int tx_max_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsigned int tx_max_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) void *data, int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct list_head rx_post_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct list_head rx_pend_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct list_head rx_free_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) spinlock_t ntb_rx_q_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void *rx_buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) unsigned int rx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) unsigned int rx_max_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) unsigned int rx_max_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) unsigned int rx_alloc_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) dma_cookie_t last_cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) struct tasklet_struct rxc_db_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) void (*event_handler)(void *data, int status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct delayed_work link_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct work_struct link_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct dentry *debugfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct dentry *debugfs_stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* Stats */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) u64 rx_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) u64 rx_pkts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) u64 rx_ring_empty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) u64 rx_err_no_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) u64 rx_err_oflow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) u64 rx_err_ver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) u64 rx_memcpy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) u64 rx_async;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) u64 tx_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) u64 tx_pkts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) u64 tx_ring_full;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) u64 tx_err_no_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) u64 tx_memcpy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) u64 tx_async;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) bool use_msi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int msi_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) struct ntb_msi_desc msi_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct ntb_msi_desc peer_msi_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct ntb_transport_mw {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) phys_addr_t phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) resource_size_t phys_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) void __iomem *vbase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) size_t xlat_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) size_t buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) size_t alloc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) void *alloc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) void *virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dma_addr_t dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct ntb_transport_client_dev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct list_head entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct ntb_transport_ctx *nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct ntb_transport_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct list_head entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct list_head client_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct ntb_dev *ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) struct ntb_transport_mw *mw_vec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct ntb_transport_qp *qp_vec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) unsigned int mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) unsigned int qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) u64 qp_bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) u64 qp_bitmap_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) bool use_msi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) unsigned int msi_spad_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) u64 msi_db_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) bool link_is_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct delayed_work link_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct work_struct link_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct dentry *debugfs_node_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) DESC_DONE_FLAG = BIT(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) LINK_DOWN_FLAG = BIT(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct ntb_payload_header {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) unsigned int ver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) unsigned int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) VERSION = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) QP_LINKS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) NUM_QPS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) NUM_MWS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) MW0_SZ_HIGH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) MW0_SZ_LOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) #define dev_client_dev(__dev) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) container_of((__dev), struct ntb_transport_client_dev, dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) #define drv_client(__drv) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) container_of((__drv), struct ntb_transport_client, driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) #define NTB_QP_DEF_NUM_ENTRIES 100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) #define NTB_LINK_DOWN_TIMEOUT 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static void ntb_transport_rxc_db(unsigned long data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static const struct ntb_ctx_ops ntb_transport_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static struct ntb_client ntb_transport_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) struct ntb_queue_entry *entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static int ntb_transport_bus_match(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) struct device_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return !strncmp(dev_name(dev), drv->name, strlen(drv->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int ntb_transport_bus_probe(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) const struct ntb_transport_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) get_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) client = drv_client(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) rc = client->probe(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static int ntb_transport_bus_remove(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) const struct ntb_transport_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) client = drv_client(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) client->remove(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static struct bus_type ntb_transport_bus = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) .name = "ntb_transport",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) .match = ntb_transport_bus_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .probe = ntb_transport_bus_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) .remove = ntb_transport_bus_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static LIST_HEAD(ntb_transport_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static int ntb_bus_init(struct ntb_transport_ctx *nt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) list_add_tail(&nt->entry, &ntb_transport_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static void ntb_bus_remove(struct ntb_transport_ctx *nt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct ntb_transport_client_dev *client_dev, *cd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) dev_name(&client_dev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) list_del(&client_dev->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) device_unregister(&client_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) list_del(&nt->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static void ntb_transport_client_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) struct ntb_transport_client_dev *client_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) client_dev = dev_client_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) kfree(client_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * ntb_transport_unregister_client_dev - Unregister NTB client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * @device_name: Name of NTB client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * Unregister an NTB client device with the NTB transport layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) void ntb_transport_unregister_client_dev(char *device_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct ntb_transport_client_dev *client, *cd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct ntb_transport_ctx *nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) list_for_each_entry(nt, &ntb_transport_list, entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) list_for_each_entry_safe(client, cd, &nt->client_devs, entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (!strncmp(dev_name(&client->dev), device_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) strlen(device_name))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) list_del(&client->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) device_unregister(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) EXPORT_SYMBOL_GPL(ntb_transport_unregister_client_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * ntb_transport_register_client_dev - Register NTB client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * @device_name: Name of NTB client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * Register an NTB client device with the NTB transport layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) int ntb_transport_register_client_dev(char *device_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) struct ntb_transport_client_dev *client_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) struct ntb_transport_ctx *nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) int node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) int rc, i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (list_empty(&ntb_transport_list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) list_for_each_entry(nt, &ntb_transport_list, entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) node = dev_to_node(&nt->ndev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) client_dev = kzalloc_node(sizeof(*client_dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (!client_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) dev = &client_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) /* setup and register client devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) dev_set_name(dev, "%s%d", device_name, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) dev->bus = &ntb_transport_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dev->release = ntb_transport_client_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) dev->parent = &nt->ndev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) rc = device_register(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) kfree(client_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) list_add_tail(&client_dev->entry, &nt->client_devs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) ntb_transport_unregister_client_dev(device_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * ntb_transport_register_client - Register NTB client driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * @drv: NTB client driver to be registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * Register an NTB client driver with the NTB transport layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) int ntb_transport_register_client(struct ntb_transport_client *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) drv->driver.bus = &ntb_transport_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (list_empty(&ntb_transport_list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return driver_register(&drv->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) EXPORT_SYMBOL_GPL(ntb_transport_register_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * ntb_transport_unregister_client - Unregister NTB client driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * @drv: NTB client driver to be unregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * Unregister an NTB client driver with the NTB transport layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) void ntb_transport_unregister_client(struct ntb_transport_client *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) driver_unregister(&drv->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) EXPORT_SYMBOL_GPL(ntb_transport_unregister_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) loff_t *offp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) ssize_t ret, out_offset, out_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) qp = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (!qp || !qp->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) out_count = 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) buf = kmalloc(out_count, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) out_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) "\nNTB QP stats:\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) "rx_bytes - \t%llu\n", qp->rx_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) "rx_pkts - \t%llu\n", qp->rx_pkts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) "rx_memcpy - \t%llu\n", qp->rx_memcpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) "rx_async - \t%llu\n", qp->rx_async);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) "rx_ring_empty - %llu\n", qp->rx_ring_empty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) "rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) "rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) "rx_err_ver - \t%llu\n", qp->rx_err_ver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) "rx_buff - \t0x%p\n", qp->rx_buff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) "rx_index - \t%u\n", qp->rx_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) "rx_max_entry - \t%u\n", qp->rx_max_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) "tx_bytes - \t%llu\n", qp->tx_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) "tx_pkts - \t%llu\n", qp->tx_pkts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) "tx_memcpy - \t%llu\n", qp->tx_memcpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) "tx_async - \t%llu\n", qp->tx_async);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) "tx_ring_full - \t%llu\n", qp->tx_ring_full);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) "tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) "tx_mw - \t0x%p\n", qp->tx_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) "tx_index (H) - \t%u\n", qp->tx_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) "RRI (T) - \t%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) qp->remote_rx_info->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) "tx_max_entry - \t%u\n", qp->tx_max_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) "free tx - \t%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) ntb_transport_tx_free_entry(qp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) "Using TX DMA - \t%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) qp->tx_dma_chan ? "Yes" : "No");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) "Using RX DMA - \t%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) qp->rx_dma_chan ? "Yes" : "No");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) "QP Link - \t%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) qp->link_is_up ? "Up" : "Down");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) out_offset += scnprintf(buf + out_offset, out_count - out_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (out_offset > out_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) out_offset = out_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) static const struct file_operations ntb_qp_debugfs_stats = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) .open = simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) .read = debugfs_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) static void ntb_list_add(spinlock_t *lock, struct list_head *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) spin_lock_irqsave(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) list_add_tail(entry, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) spin_unlock_irqrestore(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) struct list_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) spin_lock_irqsave(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (list_empty(list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) entry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) entry = list_first_entry(list, struct ntb_queue_entry, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) list_del(&entry->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) spin_unlock_irqrestore(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) static struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) struct list_head *list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct list_head *to_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) spin_lock_irqsave(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (list_empty(list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) entry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) entry = list_first_entry(list, struct ntb_queue_entry, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) list_move_tail(&entry->entry, to_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) spin_unlock_irqrestore(lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) unsigned int qp_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) struct ntb_transport_mw *mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) struct ntb_dev *ndev = nt->ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) unsigned int rx_size, num_qps_mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) unsigned int mw_num, mw_count, qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) int node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) mw_count = nt->mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) qp_count = nt->qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) mw_num = QP_TO_MW(nt, qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) mw = &nt->mw_vec[mw_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (!mw->virt_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) if (mw_num < qp_count % mw_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) num_qps_mw = qp_count / mw_count + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) num_qps_mw = qp_count / mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) rx_size = (unsigned int)mw->xlat_size / num_qps_mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) rx_size -= sizeof(struct ntb_rx_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) qp->remote_rx_info = qp->rx_buff + rx_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /* Due to housekeeping, there must be atleast 2 buffs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) qp->rx_max_frame = min(transport_mtu, rx_size / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) qp->rx_max_entry = rx_size / qp->rx_max_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) qp->rx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) * Checking to see if we have more entries than the default.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) * We should add additional entries if that is the case so we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) * can be in sync with the transport frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) node = dev_to_node(&ndev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) entry->qp = qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) &qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) qp->rx_alloc_entry++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) qp->remote_rx_info->entry = qp->rx_max_entry - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) /* setup the hdr offsets with 0's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) for (i = 0; i < qp->rx_max_entry; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) void *offset = (qp->rx_buff + qp->rx_max_frame * (i + 1) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) sizeof(struct ntb_payload_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) memset(offset, 0, sizeof(struct ntb_payload_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) qp->rx_pkts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) qp->tx_pkts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) qp->tx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) static irqreturn_t ntb_transport_isr(int irq, void *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) struct ntb_transport_qp *qp = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) static void ntb_transport_setup_qp_peer_msi(struct ntb_transport_ctx *nt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) unsigned int qp_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) int spad = qp_num * 2 + nt->msi_spad_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (!nt->use_msi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (spad >= ntb_spad_count(nt->ndev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) qp->peer_msi_desc.addr_offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) ntb_peer_spad_read(qp->ndev, PIDX, spad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) qp->peer_msi_desc.data =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) ntb_peer_spad_read(qp->ndev, PIDX, spad + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) dev_dbg(&qp->ndev->pdev->dev, "QP%d Peer MSI addr=%x data=%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) qp_num, qp->peer_msi_desc.addr_offset, qp->peer_msi_desc.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) if (qp->peer_msi_desc.addr_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) qp->use_msi = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) dev_info(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) "Using MSI interrupts for QP%d\n", qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) static void ntb_transport_setup_qp_msi(struct ntb_transport_ctx *nt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) unsigned int qp_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) int spad = qp_num * 2 + nt->msi_spad_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) if (!nt->use_msi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (spad >= ntb_spad_count(nt->ndev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) dev_warn_once(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) "Not enough SPADS to use MSI interrupts\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) ntb_spad_write(qp->ndev, spad, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) ntb_spad_write(qp->ndev, spad + 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) if (!qp->msi_irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) qp->msi_irq = ntbm_msi_request_irq(qp->ndev, ntb_transport_isr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) KBUILD_MODNAME, qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) &qp->msi_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (qp->msi_irq < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) dev_warn(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) "Unable to allocate MSI interrupt for qp%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) rc = ntb_spad_write(qp->ndev, spad, qp->msi_desc.addr_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) goto err_free_interrupt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) rc = ntb_spad_write(qp->ndev, spad + 1, qp->msi_desc.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) goto err_free_interrupt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) dev_dbg(&qp->ndev->pdev->dev, "QP%d MSI %d addr=%x data=%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) qp_num, qp->msi_irq, qp->msi_desc.addr_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) qp->msi_desc.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) err_free_interrupt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) devm_free_irq(&nt->ndev->dev, qp->msi_irq, qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) static void ntb_transport_msi_peer_desc_changed(struct ntb_transport_ctx *nt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) dev_dbg(&nt->ndev->pdev->dev, "Peer MSI descriptors changed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) for (i = 0; i < nt->qp_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) ntb_transport_setup_qp_peer_msi(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) static void ntb_transport_msi_desc_changed(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) struct ntb_transport_ctx *nt = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) dev_dbg(&nt->ndev->pdev->dev, "MSI descriptors changed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) for (i = 0; i < nt->qp_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) ntb_transport_setup_qp_msi(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) ntb_peer_db_set(nt->ndev, nt->msi_db_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) struct pci_dev *pdev = nt->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) if (!mw->virt_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) ntb_mw_clear_trans(nt->ndev, PIDX, num_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) dma_free_coherent(&pdev->dev, mw->alloc_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) mw->alloc_addr, mw->dma_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) mw->xlat_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) mw->buff_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) mw->alloc_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) mw->alloc_addr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) mw->virt_addr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) static int ntb_alloc_mw_buffer(struct ntb_transport_mw *mw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) struct device *dma_dev, size_t align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) dma_addr_t dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) void *alloc_addr, *virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) alloc_addr = dma_alloc_coherent(dma_dev, mw->alloc_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) &dma_addr, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (!alloc_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) dev_err(dma_dev, "Unable to alloc MW buff of size %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) mw->alloc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) virt_addr = alloc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * we must ensure that the memory address allocated is BAR size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) * aligned in order for the XLAT register to take the value. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * is a requirement of the hardware. It is recommended to setup CMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * for BAR sizes equal or greater than 4MB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) if (!IS_ALIGNED(dma_addr, align)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) if (mw->alloc_size > mw->buff_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) virt_addr = PTR_ALIGN(alloc_addr, align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) dma_addr = ALIGN(dma_addr, align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) mw->alloc_addr = alloc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) mw->virt_addr = virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) mw->dma_addr = dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) dma_free_coherent(dma_dev, mw->alloc_size, alloc_addr, dma_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) resource_size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) struct pci_dev *pdev = nt->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) size_t xlat_size, buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) resource_size_t xlat_align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) resource_size_t xlat_align_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) &xlat_align_size, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) xlat_size = round_up(size, xlat_align_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) buff_size = round_up(size, xlat_align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) /* No need to re-setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) if (mw->xlat_size == xlat_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (mw->buff_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) ntb_free_mw(nt, num_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) /* Alloc memory for receiving data. Must be aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) mw->xlat_size = xlat_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) mw->buff_size = buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) mw->alloc_size = buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) mw->alloc_size *= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) "Unable to alloc aligned MW buff\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) mw->xlat_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) mw->buff_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) mw->alloc_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) /* Notify HW the memory location of the receive buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) rc = ntb_mw_set_trans(nt->ndev, PIDX, num_mw, mw->dma_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) mw->xlat_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) ntb_free_mw(nt, num_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) qp->link_is_up = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) qp->active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) qp->tx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) qp->rx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) qp->rx_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) qp->rx_pkts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) qp->rx_ring_empty = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) qp->rx_err_no_buf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) qp->rx_err_oflow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) qp->rx_err_ver = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) qp->rx_memcpy = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) qp->rx_async = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) qp->tx_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) qp->tx_pkts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) qp->tx_ring_full = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) qp->tx_err_no_buf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) qp->tx_memcpy = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) qp->tx_async = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) struct ntb_transport_ctx *nt = qp->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) struct pci_dev *pdev = nt->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) cancel_delayed_work_sync(&qp->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) ntb_qp_link_down_reset(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) if (qp->event_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) qp->event_handler(qp->cb_data, qp->link_is_up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) static void ntb_qp_link_cleanup_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) struct ntb_transport_qp *qp = container_of(work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) struct ntb_transport_qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) struct ntb_transport_ctx *nt = qp->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) ntb_qp_link_cleanup(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) if (nt->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) schedule_delayed_work(&qp->link_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) static void ntb_qp_link_down(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) schedule_work(&qp->link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) u64 qp_bitmap_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) unsigned int i, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) /* Pass along the info to any clients */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) for (i = 0; i < nt->qp_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (qp_bitmap_alloc & BIT_ULL(i)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) qp = &nt->qp_vec[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) ntb_qp_link_cleanup(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) cancel_work_sync(&qp->link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) cancel_delayed_work_sync(&qp->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) if (!nt->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) cancel_delayed_work_sync(&nt->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) for (i = 0; i < nt->mw_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) ntb_free_mw(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) /* The scratchpad registers keep the values if the remote side
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) * goes down, blast them now to give them a sane value the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) * time they are accessed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) count = ntb_spad_count(nt->ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) for (i = 0; i < count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) ntb_spad_write(nt->ndev, i, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) static void ntb_transport_link_cleanup_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) struct ntb_transport_ctx *nt =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) container_of(work, struct ntb_transport_ctx, link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) ntb_transport_link_cleanup(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) static void ntb_transport_event_callback(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) struct ntb_transport_ctx *nt = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) schedule_delayed_work(&nt->link_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) schedule_work(&nt->link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) static void ntb_transport_link_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) struct ntb_transport_ctx *nt =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) container_of(work, struct ntb_transport_ctx, link_work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) struct ntb_dev *ndev = nt->ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) struct pci_dev *pdev = ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) resource_size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) int rc = 0, i, spad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) /* send the local info, in the opposite order of the way we read it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (nt->use_msi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) rc = ntb_msi_setup_mws(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) dev_warn(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) "Failed to register MSI memory window: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) nt->use_msi = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) for (i = 0; i < nt->qp_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) ntb_transport_setup_qp_msi(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) for (i = 0; i < nt->mw_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) size = nt->mw_vec[i].phys_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) if (max_mw_size && size > max_mw_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) size = max_mw_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) spad = MW0_SZ_HIGH + (i * 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) ntb_peer_spad_write(ndev, PIDX, spad, upper_32_bits(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) spad = MW0_SZ_LOW + (i * 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) ntb_peer_spad_write(ndev, PIDX, spad, lower_32_bits(size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) ntb_peer_spad_write(ndev, PIDX, NUM_MWS, nt->mw_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) ntb_peer_spad_write(ndev, PIDX, NUM_QPS, nt->qp_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) ntb_peer_spad_write(ndev, PIDX, VERSION, NTB_TRANSPORT_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) /* Query the remote side for its info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) val = ntb_spad_read(ndev, VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) dev_dbg(&pdev->dev, "Remote version = %d\n", val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) if (val != NTB_TRANSPORT_VERSION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) val = ntb_spad_read(ndev, NUM_QPS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) if (val != nt->qp_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) val = ntb_spad_read(ndev, NUM_MWS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) if (val != nt->mw_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) for (i = 0; i < nt->mw_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) u64 val64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) val64 = (u64)val << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) val64 |= val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) rc = ntb_set_mw(nt, i, val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) nt->link_is_up = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) for (i = 0; i < nt->qp_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) struct ntb_transport_qp *qp = &nt->qp_vec[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) ntb_transport_setup_qp_mw(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) ntb_transport_setup_qp_peer_msi(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) if (qp->client_ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) schedule_delayed_work(&qp->link_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) for (i = 0; i < nt->mw_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) ntb_free_mw(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) /* if there's an actual failure, we should just bail */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (ntb_link_is_up(ndev, NULL, NULL) == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) schedule_delayed_work(&nt->link_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) static void ntb_qp_link_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) struct ntb_transport_qp *qp = container_of(work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) struct ntb_transport_qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) link_work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) struct pci_dev *pdev = qp->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) struct ntb_transport_ctx *nt = qp->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) WARN_ON(!nt->link_is_up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) val = ntb_spad_read(nt->ndev, QP_LINKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) ntb_peer_spad_write(nt->ndev, PIDX, QP_LINKS, val | BIT(qp->qp_num));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) /* query remote spad for qp ready bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) /* See if the remote side is up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (val & BIT(qp->qp_num)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) qp->link_is_up = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) qp->active = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (qp->event_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) qp->event_handler(qp->cb_data, qp->link_is_up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) if (qp->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) } else if (nt->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) schedule_delayed_work(&qp->link_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) unsigned int qp_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) phys_addr_t mw_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) resource_size_t mw_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) unsigned int num_qps_mw, tx_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) unsigned int mw_num, mw_count, qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) u64 qp_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) mw_count = nt->mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) qp_count = nt->qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) mw_num = QP_TO_MW(nt, qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) qp = &nt->qp_vec[qp_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) qp->qp_num = qp_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) qp->transport = nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) qp->ndev = nt->ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) qp->client_ready = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) qp->event_handler = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) ntb_qp_link_down_reset(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) if (mw_num < qp_count % mw_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) num_qps_mw = qp_count / mw_count + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) num_qps_mw = qp_count / mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) mw_base = nt->mw_vec[mw_num].phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) mw_size = nt->mw_vec[mw_num].phys_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) if (max_mw_size && mw_size > max_mw_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) mw_size = max_mw_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) tx_size = (unsigned int)mw_size / num_qps_mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) qp_offset = tx_size * (qp_num / mw_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) qp->tx_mw_size = tx_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) if (!qp->tx_mw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) qp->tx_mw_phys = mw_base + qp_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) if (!qp->tx_mw_phys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) tx_size -= sizeof(struct ntb_rx_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) qp->rx_info = qp->tx_mw + tx_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) /* Due to housekeeping, there must be atleast 2 buffs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) qp->tx_max_frame = min(transport_mtu, tx_size / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) qp->tx_max_entry = tx_size / qp->tx_max_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) if (nt->debugfs_node_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) char debugfs_name[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) snprintf(debugfs_name, 4, "qp%d", qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) qp->debugfs_dir = debugfs_create_dir(debugfs_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) nt->debugfs_node_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) qp->debugfs_dir, qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) &ntb_qp_debugfs_stats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) qp->debugfs_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) qp->debugfs_stats = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) spin_lock_init(&qp->ntb_rx_q_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) spin_lock_init(&qp->ntb_tx_free_q_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) INIT_LIST_HEAD(&qp->rx_post_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) INIT_LIST_HEAD(&qp->rx_pend_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) INIT_LIST_HEAD(&qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) INIT_LIST_HEAD(&qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) (unsigned long)qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) struct ntb_transport_ctx *nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) struct ntb_transport_mw *mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) unsigned int mw_count, qp_count, spad_count, max_mw_count_for_spads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) u64 qp_bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) int node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) int rc, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) mw_count = ntb_peer_mw_count(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) if (!ndev->ops->mw_set_trans) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) dev_err(&ndev->dev, "Inbound MW based NTB API is required\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) if (ntb_db_is_unsafe(ndev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) dev_dbg(&ndev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) "doorbell is unsafe, proceed anyway...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) if (ntb_spad_is_unsafe(ndev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) dev_dbg(&ndev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) "scratchpad is unsafe, proceed anyway...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) node = dev_to_node(&ndev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) if (!nt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) nt->ndev = ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) * If we are using MSI, and have at least one extra memory window,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) * we will reserve the last MW for the MSI window.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) if (use_msi && mw_count > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) rc = ntb_msi_init(ndev, ntb_transport_msi_desc_changed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) mw_count -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) nt->use_msi = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) spad_count = ntb_spad_count(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) /* Limit the MW's based on the availability of scratchpads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) if (spad_count < NTB_TRANSPORT_MIN_SPADS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) nt->mw_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) nt->mw_count = min(mw_count, max_mw_count_for_spads);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) nt->msi_spad_offset = nt->mw_count * 2 + MW0_SZ_HIGH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) nt->mw_vec = kcalloc_node(mw_count, sizeof(*nt->mw_vec),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) if (!nt->mw_vec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) for (i = 0; i < mw_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) mw = &nt->mw_vec[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) rc = ntb_peer_mw_get_addr(ndev, i, &mw->phys_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) &mw->phys_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) if (!mw->vbase) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) mw->buff_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) mw->xlat_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) mw->virt_addr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) mw->dma_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) qp_bitmap = ntb_db_valid_mask(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) qp_count = ilog2(qp_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) if (nt->use_msi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) qp_count -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) nt->msi_db_mask = 1 << qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) ntb_db_clear_mask(ndev, nt->msi_db_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) if (max_num_clients && max_num_clients < qp_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) qp_count = max_num_clients;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) else if (nt->mw_count < qp_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) qp_count = nt->mw_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) qp_bitmap &= BIT_ULL(qp_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) nt->qp_count = qp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) nt->qp_bitmap = qp_bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) nt->qp_bitmap_free = qp_bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) nt->qp_vec = kcalloc_node(qp_count, sizeof(*nt->qp_vec),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) if (!nt->qp_vec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) if (nt_debugfs_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) nt->debugfs_node_dir =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) debugfs_create_dir(pci_name(ndev->pdev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) nt_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) for (i = 0; i < qp_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) rc = ntb_transport_init_queue(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) goto err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) goto err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) INIT_LIST_HEAD(&nt->client_devs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) rc = ntb_bus_init(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) goto err3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) nt->link_is_up = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) ntb_link_event(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) err3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) ntb_clear_ctx(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) err2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) kfree(nt->qp_vec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) err1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) while (i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) mw = &nt->mw_vec[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) iounmap(mw->vbase);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) kfree(nt->mw_vec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) kfree(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) struct ntb_transport_ctx *nt = ndev->ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) u64 qp_bitmap_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) ntb_transport_link_cleanup(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) cancel_work_sync(&nt->link_cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) cancel_delayed_work_sync(&nt->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) /* verify that all the qp's are freed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) for (i = 0; i < nt->qp_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) qp = &nt->qp_vec[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) if (qp_bitmap_alloc & BIT_ULL(i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) ntb_transport_free_queue(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) debugfs_remove_recursive(qp->debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) ntb_link_disable(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) ntb_clear_ctx(ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) ntb_bus_remove(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) for (i = nt->mw_count; i--; ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) ntb_free_mw(nt, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) iounmap(nt->mw_vec[i].vbase);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) kfree(nt->qp_vec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) kfree(nt->mw_vec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) kfree(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) static void ntb_complete_rxc(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) void *cb_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) unsigned long irqflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) while (!list_empty(&qp->rx_post_q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) entry = list_first_entry(&qp->rx_post_q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) struct ntb_queue_entry, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) if (!(entry->flags & DESC_DONE_FLAG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) entry->rx_hdr->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) iowrite32(entry->rx_index, &qp->rx_info->entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) cb_data = entry->cb_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) len = entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) list_move_tail(&entry->entry, &qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) if (qp->rx_handler && qp->client_ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) qp->rx_handler(qp, qp->cb_data, cb_data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) static void ntb_rx_copy_callback(void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) const struct dmaengine_result *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) struct ntb_queue_entry *entry = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) /* we need to check DMA results if we are using DMA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) enum dmaengine_tx_result dma_err = res->result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) switch (dma_err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) case DMA_TRANS_READ_FAILED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) case DMA_TRANS_WRITE_FAILED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) entry->errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) case DMA_TRANS_ABORTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) struct ntb_transport_qp *qp = entry->qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) void *offset = qp->rx_buff + qp->rx_max_frame *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) qp->rx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) ntb_memcpy_rx(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) qp->rx_memcpy++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) case DMA_TRANS_NOERROR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) entry->flags |= DESC_DONE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) ntb_complete_rxc(entry->qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) void *buf = entry->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) size_t len = entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) memcpy(buf, offset, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) /* Ensure that the data is fully copied out before clearing the flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) ntb_rx_copy_callback(entry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) struct dma_async_tx_descriptor *txd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) struct ntb_transport_qp *qp = entry->qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) struct dma_chan *chan = qp->rx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) struct dma_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) size_t pay_off, buff_off, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) struct dmaengine_unmap_data *unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) dma_cookie_t cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) void *buf = entry->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) len = entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) device = chan->device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) pay_off = (size_t)offset & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) buff_off = (size_t)buf & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) if (!is_dma_copy_aligned(device, pay_off, buff_off, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) if (!unmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) unmap->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) pay_off, len, DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) if (dma_mapping_error(device->dev, unmap->addr[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) goto err_get_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) unmap->to_cnt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) buff_off, len, DMA_FROM_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) if (dma_mapping_error(device->dev, unmap->addr[1]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) goto err_get_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) unmap->from_cnt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) txd = device->device_prep_dma_memcpy(chan, unmap->addr[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) unmap->addr[0], len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) DMA_PREP_INTERRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) if (!txd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) goto err_get_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) txd->callback_result = ntb_rx_copy_callback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) txd->callback_param = entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) dma_set_unmap(txd, unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) cookie = dmaengine_submit(txd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) if (dma_submit_error(cookie))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) goto err_set_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) qp->last_cookie = cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) qp->rx_async++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) err_set_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) err_get_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) struct ntb_transport_qp *qp = entry->qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) struct dma_chan *chan = qp->rx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) if (!chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) if (entry->len < copy_bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) res = ntb_async_rx_submit(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) if (res < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) if (!entry->retries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) qp->rx_async++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) ntb_memcpy_rx(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) qp->rx_memcpy++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) static int ntb_process_rxc(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) struct ntb_payload_header *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) void *offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) qp->qp_num, hdr->ver, hdr->len, hdr->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) if (!(hdr->flags & DESC_DONE_FLAG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) qp->rx_ring_empty++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) if (hdr->flags & LINK_DOWN_FLAG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) ntb_qp_link_down(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) hdr->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) if (hdr->ver != (u32)qp->rx_pkts) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) dev_dbg(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) "version mismatch, expected %llu - got %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) qp->rx_pkts, hdr->ver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) qp->rx_err_ver++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) if (!entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) qp->rx_err_no_buf++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) entry->rx_hdr = hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) entry->rx_index = qp->rx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) if (hdr->len > entry->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) dev_dbg(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) "receive buffer overflow! Wanted %d got %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) hdr->len, entry->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) qp->rx_err_oflow++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) entry->len = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) entry->flags |= DESC_DONE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) ntb_complete_rxc(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) dev_dbg(&qp->ndev->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) "RX OK index %u ver %u size %d into buf size %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) qp->rx_index, hdr->ver, hdr->len, entry->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) qp->rx_bytes += hdr->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) qp->rx_pkts++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) entry->len = hdr->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) ntb_async_rx(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) qp->rx_index++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) qp->rx_index %= qp->rx_max_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) static void ntb_transport_rxc_db(unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) struct ntb_transport_qp *qp = (void *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) int rc, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) __func__, qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) /* Limit the number of packets processed in a single interrupt to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) * provide fairness to others
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) for (i = 0; i < qp->rx_max_entry; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) rc = ntb_process_rxc(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) if (i && qp->rx_dma_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) dma_async_issue_pending(qp->rx_dma_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) if (i == qp->rx_max_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) /* there is more work to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) if (qp->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) /* the doorbell bit is set: clear it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) /* ntb_db_read ensures ntb_db_clear write is committed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) ntb_db_read(qp->ndev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) /* an interrupt may have arrived between finishing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) * ntb_process_rxc and clearing the doorbell bit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) * there might be some more work to do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) if (qp->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) static void ntb_tx_copy_callback(void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) const struct dmaengine_result *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) struct ntb_queue_entry *entry = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) struct ntb_transport_qp *qp = entry->qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) struct ntb_payload_header __iomem *hdr = entry->tx_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) /* we need to check DMA results if we are using DMA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) enum dmaengine_tx_result dma_err = res->result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) switch (dma_err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) case DMA_TRANS_READ_FAILED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) case DMA_TRANS_WRITE_FAILED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) entry->errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) case DMA_TRANS_ABORTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) void __iomem *offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) qp->tx_mw + qp->tx_max_frame *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) entry->tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) /* resubmit via CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) ntb_memcpy_tx(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) qp->tx_memcpy++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) case DMA_TRANS_NOERROR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) if (qp->use_msi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) ntb_msi_peer_trigger(qp->ndev, PIDX, &qp->peer_msi_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) /* The entry length can only be zero if the packet is intended to be a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) * "link down" or similar. Since no payload is being sent in these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) * cases, there is nothing to add to the completion queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) if (entry->len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) qp->tx_bytes += entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) if (qp->tx_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) qp->tx_handler(qp, qp->cb_data, entry->cb_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) entry->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) #ifdef ARCH_HAS_NOCACHE_UACCESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) * Using non-temporal mov to improve performance on non-cached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) * writes, even though we aren't actually copying from user space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) memcpy_toio(offset, entry->buf, entry->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) /* Ensure that the data is fully copied out before setting the flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) ntb_tx_copy_callback(entry, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) struct ntb_queue_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) struct dma_async_tx_descriptor *txd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) struct dma_chan *chan = qp->tx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) struct dma_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) size_t len = entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) void *buf = entry->buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) size_t dest_off, buff_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) struct dmaengine_unmap_data *unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) dma_addr_t dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) dma_cookie_t cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) device = chan->device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) dest = qp->tx_mw_dma_addr + qp->tx_max_frame * entry->tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) buff_off = (size_t)buf & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) dest_off = (size_t)dest & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) if (!is_dma_copy_aligned(device, buff_off, dest_off, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) if (!unmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) unmap->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) buff_off, len, DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) if (dma_mapping_error(device->dev, unmap->addr[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) goto err_get_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) unmap->to_cnt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) DMA_PREP_INTERRUPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) if (!txd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) goto err_get_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) txd->callback_result = ntb_tx_copy_callback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) txd->callback_param = entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) dma_set_unmap(txd, unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) cookie = dmaengine_submit(txd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) if (dma_submit_error(cookie))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) goto err_set_unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) dma_async_issue_pending(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) err_set_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) err_get_unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) static void ntb_async_tx(struct ntb_transport_qp *qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) struct ntb_queue_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) struct ntb_payload_header __iomem *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) struct dma_chan *chan = qp->tx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) void __iomem *offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) entry->tx_index = qp->tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) entry->tx_hdr = hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) iowrite32(entry->len, &hdr->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) iowrite32((u32)qp->tx_pkts, &hdr->ver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) if (!chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) if (entry->len < copy_bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) res = ntb_async_tx_submit(qp, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) if (res < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) if (!entry->retries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) qp->tx_async++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) ntb_memcpy_tx(entry, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) qp->tx_memcpy++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) static int ntb_process_tx(struct ntb_transport_qp *qp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) struct ntb_queue_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) if (qp->tx_index == qp->remote_rx_info->entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) qp->tx_ring_full++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) if (qp->tx_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) qp->tx_handler(qp, qp->cb_data, NULL, -EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) ntb_async_tx(qp, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) qp->tx_index++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) qp->tx_index %= qp->tx_max_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) qp->tx_pkts++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) static void ntb_send_link_down(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) struct pci_dev *pdev = qp->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) int i, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) if (!qp->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) dev_info(&pdev->dev, "qp %d: Send Link Down\n", qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) if (entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) msleep(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) entry->cb_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) entry->buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) entry->len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) entry->flags = LINK_DOWN_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) rc = ntb_process_tx(qp, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) ntb_qp_link_down_reset(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) return dev_to_node(&chan->dev->device) == (int)(unsigned long)node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) * ntb_transport_create_queue - Create a new NTB transport layer queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) * @rx_handler: receive callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) * @tx_handler: transmit callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) * @event_handler: event callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) * Create a new NTB transport layer queue and provide the queue with a callback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) * routine for both transmit and receive. The receive callback routine will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) * used to pass up data when the transport has received it on the queue. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) * transmit callback routine will be called when the transport has completed the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) * transmission of the data on the queue and the data is ready to be freed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) * RETURNS: pointer to newly created ntb_queue, NULL on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) struct ntb_transport_qp *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) ntb_transport_create_queue(void *data, struct device *client_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) const struct ntb_queue_handlers *handlers)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) struct ntb_dev *ndev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) struct pci_dev *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) struct ntb_transport_ctx *nt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) u64 qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) unsigned int free_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) dma_cap_mask_t dma_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) int node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) ndev = dev_ntb(client_dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) pdev = ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) nt = ndev->ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) node = dev_to_node(&ndev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) free_queue = ffs(nt->qp_bitmap_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) if (!free_queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) /* decrement free_queue to make it zero based */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) free_queue--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) qp = &nt->qp_vec[free_queue];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005) qp_bit = BIT_ULL(qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) nt->qp_bitmap_free &= ~qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) qp->cb_data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) qp->rx_handler = handlers->rx_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) qp->tx_handler = handlers->tx_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) qp->event_handler = handlers->event_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) dma_cap_zero(dma_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) dma_cap_set(DMA_MEMCPY, dma_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) if (use_dma) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) qp->tx_dma_chan =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) dma_request_channel(dma_mask, ntb_dma_filter_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) (void *)(unsigned long)node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) if (!qp->tx_dma_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) qp->rx_dma_chan =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) dma_request_channel(dma_mask, ntb_dma_filter_fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026) (void *)(unsigned long)node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) if (!qp->rx_dma_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) qp->tx_dma_chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) qp->rx_dma_chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) qp->tx_mw_dma_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) if (qp->tx_dma_chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036) qp->tx_mw_dma_addr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) dma_map_resource(qp->tx_dma_chan->device->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) qp->tx_mw_phys, qp->tx_mw_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) DMA_FROM_DEVICE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) if (dma_mapping_error(qp->tx_dma_chan->device->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) qp->tx_mw_dma_addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042) qp->tx_mw_dma_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047) dev_dbg(&pdev->dev, "Using %s memcpy for TX\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048) qp->tx_dma_chan ? "DMA" : "CPU");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) dev_dbg(&pdev->dev, "Using %s memcpy for RX\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) qp->rx_dma_chan ? "DMA" : "CPU");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053) for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) goto err1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) entry->qp = qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059) ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060) &qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062) qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) for (i = 0; i < qp->tx_max_entry; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065) entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067) goto err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069) entry->qp = qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071) &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074) ntb_db_clear(qp->ndev, qp_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075) ntb_db_clear_mask(qp->ndev, qp_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079) return qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081) err2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082) while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) err1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085) qp->rx_alloc_entry = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) if (qp->tx_mw_dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089) dma_unmap_resource(qp->tx_dma_chan->device->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) qp->tx_mw_dma_addr, qp->tx_mw_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) DMA_FROM_DEVICE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) if (qp->tx_dma_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093) dma_release_channel(qp->tx_dma_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094) if (qp->rx_dma_chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) dma_release_channel(qp->rx_dma_chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) nt->qp_bitmap_free |= qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100) EXPORT_SYMBOL_GPL(ntb_transport_create_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103) * ntb_transport_free_queue - Frees NTB transport queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) * @qp: NTB queue to be freed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) * Frees NTB transport queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108) void ntb_transport_free_queue(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) struct pci_dev *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112) u64 qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117) pdev = qp->ndev->pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119) qp->active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) if (qp->tx_dma_chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122) struct dma_chan *chan = qp->tx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) /* Putting the dma_chan to NULL will force any new traffic to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124) * processed by the CPU instead of the DAM engine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126) qp->tx_dma_chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) /* Try to be nice and wait for any queued DMA engine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) * transactions to process before smashing it with a rock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) dma_sync_wait(chan, qp->last_cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132) dmaengine_terminate_all(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134) dma_unmap_resource(chan->device->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) qp->tx_mw_dma_addr, qp->tx_mw_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136) DMA_FROM_DEVICE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) dma_release_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) if (qp->rx_dma_chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142) struct dma_chan *chan = qp->rx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143) /* Putting the dma_chan to NULL will force any new traffic to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) * processed by the CPU instead of the DAM engine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146) qp->rx_dma_chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) /* Try to be nice and wait for any queued DMA engine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) * transactions to process before smashing it with a rock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151) dma_sync_wait(chan, qp->last_cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152) dmaengine_terminate_all(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) dma_release_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156) qp_bit = BIT_ULL(qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158) ntb_db_set_mask(qp->ndev, qp_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159) tasklet_kill(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161) cancel_delayed_work_sync(&qp->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163) qp->cb_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) qp->rx_handler = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) qp->tx_handler = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) qp->event_handler = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2177) dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2178) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2181) while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2182) kfree(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2184) qp->transport->qp_bitmap_free |= qp_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2186) dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2188) EXPORT_SYMBOL_GPL(ntb_transport_free_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2190) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2191) * ntb_transport_rx_remove - Dequeues enqueued rx packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2192) * @qp: NTB queue to be freed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2193) * @len: pointer to variable to write enqueued buffers length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2194) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2195) * Dequeues unused buffers from receive queue. Should only be used during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2196) * shutdown of qp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2197) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2198) * RETURNS: NULL error value on error, or void* for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2199) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2200) void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2202) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2203) void *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2205) if (!qp || qp->client_ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2206) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2208) entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2209) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2210) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2212) buf = entry->cb_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2213) *len = entry->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2215) ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2217) return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2219) EXPORT_SYMBOL_GPL(ntb_transport_rx_remove);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2221) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2222) * ntb_transport_rx_enqueue - Enqueue a new NTB queue entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2223) * @qp: NTB transport layer queue the entry is to be enqueued on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2224) * @cb: per buffer pointer for callback function to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2225) * @data: pointer to data buffer that incoming packets will be copied into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2226) * @len: length of the data buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2227) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2228) * Enqueue a new receive buffer onto the transport queue into which a NTB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2229) * payload can be received into.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2230) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2231) * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2233) int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2234) unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2236) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2238) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2239) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2241) entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2242) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2243) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2245) entry->cb_data = cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2246) entry->buf = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2247) entry->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2248) entry->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2249) entry->retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2250) entry->errors = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2251) entry->rx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2253) ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2255) if (qp->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2256) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2258) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2260) EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2262) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2263) * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2264) * @qp: NTB transport layer queue the entry is to be enqueued on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2265) * @cb: per buffer pointer for callback function to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2266) * @data: pointer to data buffer that will be sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2267) * @len: length of the data buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2268) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2269) * Enqueue a new transmit buffer onto the transport queue from which a NTB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2270) * payload will be transmitted. This assumes that a lock is being held to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2271) * serialize access to the qp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2272) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2273) * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2275) int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2276) unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2278) struct ntb_queue_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2279) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2281) if (!qp || !qp->link_is_up || !len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2282) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2284) entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2285) if (!entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2286) qp->tx_err_no_buf++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2287) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2290) entry->cb_data = cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2291) entry->buf = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2292) entry->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2293) entry->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2294) entry->errors = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2295) entry->retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2296) entry->tx_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2298) rc = ntb_process_tx(qp, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2299) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2300) ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2301) &qp->tx_free_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2303) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2305) EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2307) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2308) * ntb_transport_link_up - Notify NTB transport of client readiness to use queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2309) * @qp: NTB transport layer queue to be enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2310) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2311) * Notify NTB transport layer of client readiness to use queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2313) void ntb_transport_link_up(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2315) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2316) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2318) qp->client_ready = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2320) if (qp->transport->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2321) schedule_delayed_work(&qp->link_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2323) EXPORT_SYMBOL_GPL(ntb_transport_link_up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2325) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2326) * ntb_transport_link_down - Notify NTB transport to no longer enqueue data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2327) * @qp: NTB transport layer queue to be disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2328) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2329) * Notify NTB transport layer of client's desire to no longer receive data on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2330) * transport queue specified. It is the client's responsibility to ensure all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2331) * entries on queue are purged or otherwise handled appropriately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2332) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2333) void ntb_transport_link_down(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2334) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2335) int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2337) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2338) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2340) qp->client_ready = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2342) val = ntb_spad_read(qp->ndev, QP_LINKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2344) ntb_peer_spad_write(qp->ndev, PIDX, QP_LINKS, val & ~BIT(qp->qp_num));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2346) if (qp->link_is_up)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2347) ntb_send_link_down(qp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2348) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2349) cancel_delayed_work_sync(&qp->link_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2351) EXPORT_SYMBOL_GPL(ntb_transport_link_down);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2353) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2354) * ntb_transport_link_query - Query transport link state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2355) * @qp: NTB transport layer queue to be queried
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2356) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2357) * Query connectivity to the remote system of the NTB transport queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2358) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2359) * RETURNS: true for link up or false for link down
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2360) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2361) bool ntb_transport_link_query(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2363) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2364) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2366) return qp->link_is_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2368) EXPORT_SYMBOL_GPL(ntb_transport_link_query);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2370) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2371) * ntb_transport_qp_num - Query the qp number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2372) * @qp: NTB transport layer queue to be queried
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2373) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2374) * Query qp number of the NTB transport queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2375) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2376) * RETURNS: a zero based number specifying the qp number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2378) unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2380) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2381) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2383) return qp->qp_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2385) EXPORT_SYMBOL_GPL(ntb_transport_qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2387) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2388) * ntb_transport_max_size - Query the max payload size of a qp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2389) * @qp: NTB transport layer queue to be queried
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2390) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2391) * Query the maximum payload size permissible on the given qp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2392) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2393) * RETURNS: the max payload size of a qp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2395) unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2397) unsigned int max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2398) unsigned int copy_align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2399) struct dma_chan *rx_chan, *tx_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2401) if (!qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2402) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2404) rx_chan = qp->rx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2405) tx_chan = qp->tx_dma_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2407) copy_align = max(rx_chan ? rx_chan->device->copy_align : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2408) tx_chan ? tx_chan->device->copy_align : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2410) /* If DMA engine usage is possible, try to find the max size for that */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2411) max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2412) max_size = round_down(max_size, 1 << copy_align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2414) return max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2416) EXPORT_SYMBOL_GPL(ntb_transport_max_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2418) unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2420) unsigned int head = qp->tx_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2421) unsigned int tail = qp->remote_rx_info->entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2423) return tail > head ? tail - head : qp->tx_max_entry + tail - head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2425) EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2427) static void ntb_transport_doorbell_callback(void *data, int vector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2429) struct ntb_transport_ctx *nt = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2430) struct ntb_transport_qp *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2431) u64 db_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2432) unsigned int qp_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2434) if (ntb_db_read(nt->ndev) & nt->msi_db_mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2435) ntb_transport_msi_peer_desc_changed(nt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2436) ntb_db_clear(nt->ndev, nt->msi_db_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2439) db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2440) ntb_db_vector_mask(nt->ndev, vector));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2442) while (db_bits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2443) qp_num = __ffs(db_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2444) qp = &nt->qp_vec[qp_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2446) if (qp->active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2447) tasklet_schedule(&qp->rxc_db_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2449) db_bits &= ~BIT_ULL(qp_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2453) static const struct ntb_ctx_ops ntb_transport_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2454) .link_event = ntb_transport_event_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2455) .db_event = ntb_transport_doorbell_callback,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2456) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2458) static struct ntb_client ntb_transport_client = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2459) .ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2460) .probe = ntb_transport_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2461) .remove = ntb_transport_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2462) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2463) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2465) static int __init ntb_transport_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2467) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2469) pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2471) if (debugfs_initialized())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2472) nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2474) rc = bus_register(&ntb_transport_bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2475) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2476) goto err_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2478) rc = ntb_register_client(&ntb_transport_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2479) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2480) goto err_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2482) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2484) err_client:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2485) bus_unregister(&ntb_transport_bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2486) err_bus:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2487) debugfs_remove_recursive(nt_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2488) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2490) module_init(ntb_transport_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2492) static void __exit ntb_transport_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2494) ntb_unregister_client(&ntb_transport_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2495) bus_unregister(&ntb_transport_bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2496) debugfs_remove_recursive(nt_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2498) module_exit(ntb_transport_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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