^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * iSCSI over TCP/IP Data-Path lib
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 Mike Christie
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * maintained by open-iscsi@googlegroups.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #ifndef LIBISCSI_TCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define LIBISCSI_TCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <scsi/libiscsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct iscsi_tcp_conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct iscsi_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct sk_buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct ahash_request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct iscsi_segment *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct iscsi_segment {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned char *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned int total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned int total_copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct ahash_request *hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned char padbuf[ISCSI_PAD_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned char recv_digest[ISCSI_DIGEST_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned char digest[ISCSI_DIGEST_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned int digest_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct scatterlist *sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) void *sg_mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned int sg_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) bool atomic_mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) iscsi_segment_done_fn_t *done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /* Socket connection receive helper */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct iscsi_tcp_recv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct iscsi_hdr *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct iscsi_segment segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Allocate buffer for BHS + AHS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) uint32_t hdr_buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* copied and flipped values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) int datalen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct iscsi_tcp_conn {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct iscsi_conn *iscsi_conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) void *dd_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int stop_stage; /* conn_stop() flag: *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * stop to recover, *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * stop to terminate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* control data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct iscsi_tcp_recv in; /* TCP receive context */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* CRC32C (Rx) LLD should set this is they do not offload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct ahash_request *rx_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct iscsi_tcp_task {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct iscsi_r2t_info *r2t; /* in progress solict R2T */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct iscsi_pool r2tpool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct kfifo r2tqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) void *dd_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) spinlock_t pool2queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) spinlock_t queue2pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ISCSI_TCP_SKB_DONE, /* skb is out of data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) ISCSI_TCP_SUSPENDED, /* conn is suspended */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) extern void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) extern int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned int offset, bool offloaded, int *status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) extern void iscsi_tcp_cleanup_task(struct iscsi_task *task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) extern int iscsi_tcp_task_init(struct iscsi_task *task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) extern int iscsi_tcp_task_xmit(struct iscsi_task *task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* segment helpers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) extern int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) extern int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct iscsi_segment *segment, int recv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned copied);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) extern void iscsi_tcp_segment_unmap(struct iscsi_segment *segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) extern void iscsi_segment_init_linear(struct iscsi_segment *segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) void *data, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) iscsi_segment_done_fn_t *done,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct ahash_request *hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) extern int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) iscsi_segment_seek_sg(struct iscsi_segment *segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct scatterlist *sg_list, unsigned int sg_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) unsigned int offset, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) iscsi_segment_done_fn_t *done,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct ahash_request *hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* digest helpers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) extern void iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) size_t hdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unsigned char digest[ISCSI_DIGEST_SIZE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) extern struct iscsi_cls_conn *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) uint32_t conn_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) extern void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* misc helpers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) extern int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) extern void iscsi_tcp_r2tpool_free(struct iscsi_session *session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) extern int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) extern void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct iscsi_stats *stats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #endif /* LIBISCSI_TCP_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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