Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/* sunvnet.c: Sun LDOM Virtual Network Driver.
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 * Copyright (C) 2016-2017 Oracle. All rights reserved.
 */
 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/mutex.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
 
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/icmpv6.h>
#endif
 
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
 
#include <asm/vio.h>
#include <asm/ldc.h>
 
#include "sunvnet_common.h"
 
/* length of time before we decide the hardware is borked,
 * and dev->tx_timeout() should be called to fix the problem
 */
#define VNET_TX_TIMEOUT			(5 * HZ)
 
#define DRV_MODULE_NAME		"sunvnet"
#define DRV_MODULE_VERSION	"2.0"
#define DRV_MODULE_RELDATE	"February 3, 2017"
 
static char version[] =
<------>DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
 
/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
<------>{ .major = 1, .minor = 8 },
<------>{ .major = 1, .minor = 7 },
<------>{ .major = 1, .minor = 6 },
<------>{ .major = 1, .minor = 0 },
};
 
static void vnet_get_drvinfo(struct net_device *dev,
<------><------><------>     struct ethtool_drvinfo *info)
{
<------>strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
<------>strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
}
 
static u32 vnet_get_msglevel(struct net_device *dev)
{
<------>struct vnet *vp = netdev_priv(dev);
 
<------>return vp->msg_enable;
}
 
static void vnet_set_msglevel(struct net_device *dev, u32 value)
{
<------>struct vnet *vp = netdev_priv(dev);
 
<------>vp->msg_enable = value;
}
 
static const struct {
<------>const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
<------>{ "rx_packets" },
<------>{ "tx_packets" },
<------>{ "rx_bytes" },
<------>{ "tx_bytes" },
<------>{ "rx_errors" },
<------>{ "tx_errors" },
<------>{ "rx_dropped" },
<------>{ "tx_dropped" },
<------>{ "multicast" },
<------>{ "rx_length_errors" },
<------>{ "rx_frame_errors" },
<------>{ "rx_missed_errors" },
<------>{ "tx_carrier_errors" },
<------>{ "nports" },
};
 
static int vnet_get_sset_count(struct net_device *dev, int sset)
{
<------>struct vnet *vp = (struct vnet *)netdev_priv(dev);
 
<------>switch (sset) {
<------>case ETH_SS_STATS:
<------><------>return ARRAY_SIZE(ethtool_stats_keys)
<------><------><------>+ (NUM_VNET_PORT_STATS * vp->nports);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
 
static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
<------>struct vnet *vp = (struct vnet *)netdev_priv(dev);
<------>struct vnet_port *port;
<------>char *p = (char *)buf;
 
<------>switch (stringset) {
<------>case ETH_SS_STATS:
<------><------>memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
<------><------>p += sizeof(ethtool_stats_keys);
 
<------><------>rcu_read_lock();
<------><------>list_for_each_entry_rcu(port, &vp->port_list, list) {
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
<------><------><------><------> port->q_index, port->switch_port ? "s" : "q",
<------><------><------><------> port->raddr);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------><------>snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
<------><------><------><------> port->q_index);
<------><------><------>p += ETH_GSTRING_LEN;
<------><------>}
<------><------>rcu_read_unlock();
<------><------>break;
<------>default:
<------><------>WARN_ON(1);
<------><------>break;
<------>}
}
 
static void vnet_get_ethtool_stats(struct net_device *dev,
<------><------><------><------>   struct ethtool_stats *estats, u64 *data)
{
<------>struct vnet *vp = (struct vnet *)netdev_priv(dev);
<------>struct vnet_port *port;
<------>int i = 0;
 
<------>data[i++] = dev->stats.rx_packets;
<------>data[i++] = dev->stats.tx_packets;
<------>data[i++] = dev->stats.rx_bytes;
<------>data[i++] = dev->stats.tx_bytes;
<------>data[i++] = dev->stats.rx_errors;
<------>data[i++] = dev->stats.tx_errors;
<------>data[i++] = dev->stats.rx_dropped;
<------>data[i++] = dev->stats.tx_dropped;
<------>data[i++] = dev->stats.multicast;
<------>data[i++] = dev->stats.rx_length_errors;
<------>data[i++] = dev->stats.rx_frame_errors;
<------>data[i++] = dev->stats.rx_missed_errors;
<------>data[i++] = dev->stats.tx_carrier_errors;
<------>data[i++] = vp->nports;
 
<------>rcu_read_lock();
<------>list_for_each_entry_rcu(port, &vp->port_list, list) {
<------><------>data[i++] = port->q_index;
<------><------>data[i++] = port->stats.rx_packets;
<------><------>data[i++] = port->stats.tx_packets;
<------><------>data[i++] = port->stats.rx_bytes;
<------><------>data[i++] = port->stats.tx_bytes;
<------><------>data[i++] = port->stats.event_up;
<------><------>data[i++] = port->stats.event_reset;
<------>}
<------>rcu_read_unlock();
}
 
static const struct ethtool_ops vnet_ethtool_ops = {
<------>.get_drvinfo		= vnet_get_drvinfo,
<------>.get_msglevel		= vnet_get_msglevel,
<------>.set_msglevel		= vnet_set_msglevel,
<------>.get_link		= ethtool_op_get_link,
<------>.get_sset_count		= vnet_get_sset_count,
<------>.get_strings		= vnet_get_strings,
<------>.get_ethtool_stats	= vnet_get_ethtool_stats,
};
 
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
 
static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
{
<------>unsigned int hash = vnet_hashfn(skb->data);
<------>struct hlist_head *hp = &vp->port_hash[hash];
<------>struct vnet_port *port;
 
<------>hlist_for_each_entry_rcu(port, hp, hash) {
<------><------>if (!sunvnet_port_is_up_common(port))
<------><------><------>continue;
<------><------>if (ether_addr_equal(port->raddr, skb->data))
<------><------><------>return port;
<------>}
<------>list_for_each_entry_rcu(port, &vp->port_list, list) {
<------><------>if (!port->switch_port)
<------><------><------>continue;
<------><------>if (!sunvnet_port_is_up_common(port))
<------><------><------>continue;
<------><------>return port;
<------>}
<------>return NULL;
}
 
/* func arg to vnet_start_xmit_common() to get the proper tx port */
static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
<------><------><------><------><------>   struct net_device *dev)
{
<------>struct vnet *vp = netdev_priv(dev);
 
<------>return __tx_port_find(vp, skb);
}
 
static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
<------><------><------>     struct net_device *sb_dev)
{
<------>struct vnet *vp = netdev_priv(dev);
<------>struct vnet_port *port = __tx_port_find(vp, skb);
 
<------>if (!port)
<------><------>return 0;
 
<------>return port->q_index;
}
 
/* Wrappers to common functions */
static netdev_tx_t vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
<------>return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
}
 
static void vnet_set_rx_mode(struct net_device *dev)
{
<------>struct vnet *vp = netdev_priv(dev);
 
<------>return sunvnet_set_rx_mode_common(dev, vp);
}
 
#ifdef CONFIG_NET_POLL_CONTROLLER
static void vnet_poll_controller(struct net_device *dev)
{
<------>struct vnet *vp = netdev_priv(dev);
 
<------>return sunvnet_poll_controller_common(dev, vp);
}
#endif
 
static const struct net_device_ops vnet_ops = {
<------>.ndo_open		= sunvnet_open_common,
<------>.ndo_stop		= sunvnet_close_common,
<------>.ndo_set_rx_mode	= vnet_set_rx_mode,
<------>.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
<------>.ndo_validate_addr	= eth_validate_addr,
<------>.ndo_tx_timeout		= sunvnet_tx_timeout_common,
<------>.ndo_start_xmit		= vnet_start_xmit,
<------>.ndo_select_queue	= vnet_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
<------>.ndo_poll_controller	= vnet_poll_controller,
#endif
};
 
static struct vnet *vnet_new(const u64 *local_mac,
<------><------><------>     struct vio_dev *vdev)
{
<------>struct net_device *dev;
<------>struct vnet *vp;
<------>int err, i;
 
<------>dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
<------>if (!dev)
<------><------>return ERR_PTR(-ENOMEM);
<------>dev->needed_headroom = VNET_PACKET_SKIP + 8;
<------>dev->needed_tailroom = 8;
 
<------>for (i = 0; i < ETH_ALEN; i++)
<------><------>dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
 
<------>vp = netdev_priv(dev);
 
<------>spin_lock_init(&vp->lock);
<------>vp->dev = dev;
 
<------>INIT_LIST_HEAD(&vp->port_list);
<------>for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
<------><------>INIT_HLIST_HEAD(&vp->port_hash[i]);
<------>INIT_LIST_HEAD(&vp->list);
<------>vp->local_mac = *local_mac;
 
<------>dev->netdev_ops = &vnet_ops;
<------>dev->ethtool_ops = &vnet_ethtool_ops;
<------>dev->watchdog_timeo = VNET_TX_TIMEOUT;
 
<------>dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_ALL_TSO |
<------><------><------>   NETIF_F_HW_CSUM | NETIF_F_SG;
<------>dev->features = dev->hw_features;
 
<------>/* MTU range: 68 - 65535 */
<------>dev->min_mtu = ETH_MIN_MTU;
<------>dev->max_mtu = VNET_MAX_MTU;
 
<------>SET_NETDEV_DEV(dev, &vdev->dev);
 
<------>err = register_netdev(dev);
<------>if (err) {
<------><------>pr_err("Cannot register net device, aborting\n");
<------><------>goto err_out_free_dev;
<------>}
 
<------>netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
 
<------>list_add(&vp->list, &vnet_list);
 
<------>return vp;
 
err_out_free_dev:
<------>free_netdev(dev);
 
<------>return ERR_PTR(err);
}
 
static struct vnet *vnet_find_or_create(const u64 *local_mac,
<------><------><------><------><------>struct vio_dev *vdev)
{
<------>struct vnet *iter, *vp;
 
<------>mutex_lock(&vnet_list_mutex);
<------>vp = NULL;
<------>list_for_each_entry(iter, &vnet_list, list) {
<------><------>if (iter->local_mac == *local_mac) {
<------><------><------>vp = iter;
<------><------><------>break;
<------><------>}
<------>}
<------>if (!vp)
<------><------>vp = vnet_new(local_mac, vdev);
<------>mutex_unlock(&vnet_list_mutex);
 
<------>return vp;
}
 
static void vnet_cleanup(void)
{
<------>struct vnet *vp;
<------>struct net_device *dev;
 
<------>mutex_lock(&vnet_list_mutex);
<------>while (!list_empty(&vnet_list)) {
<------><------>vp = list_first_entry(&vnet_list, struct vnet, list);
<------><------>list_del(&vp->list);
<------><------>dev = vp->dev;
<------><------>/* vio_unregister_driver() should have cleaned up port_list */
<------><------>BUG_ON(!list_empty(&vp->port_list));
<------><------>unregister_netdev(dev);
<------><------>free_netdev(dev);
<------>}
<------>mutex_unlock(&vnet_list_mutex);
}
 
static const char *local_mac_prop = "local-mac-address";
 
static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
<------><------><------><------>     u64 port_node,
<------><------><------><------>     struct vio_dev *vdev)
{
<------>const u64 *local_mac = NULL;
<------>u64 a;
 
<------>mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
<------><------>u64 target = mdesc_arc_target(hp, a);
<------><------>const char *name;
 
<------><------>name = mdesc_get_property(hp, target, "name", NULL);
<------><------>if (!name || strcmp(name, "network"))
<------><------><------>continue;
 
<------><------>local_mac = mdesc_get_property(hp, target,
<------><------><------><------><------>       local_mac_prop, NULL);
<------><------>if (local_mac)
<------><------><------>break;
<------>}
<------>if (!local_mac)
<------><------>return ERR_PTR(-ENODEV);
 
<------>return vnet_find_or_create(local_mac, vdev);
}
 
static struct ldc_channel_config vnet_ldc_cfg = {
<------>.event		= sunvnet_event_common,
<------>.mtu		= 64,
<------>.mode		= LDC_MODE_UNRELIABLE,
};
 
static struct vio_driver_ops vnet_vio_ops = {
<------>.send_attr		= sunvnet_send_attr_common,
<------>.handle_attr		= sunvnet_handle_attr_common,
<------>.handshake_complete	= sunvnet_handshake_complete_common,
};
 
const char *remote_macaddr_prop = "remote-mac-address";
 
static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
<------>struct mdesc_handle *hp;
<------>struct vnet_port *port;
<------>unsigned long flags;
<------>struct vnet *vp;
<------>const u64 *rmac;
<------>int len, i, err, switch_port;
 
<------>hp = mdesc_grab();
 
<------>vp = vnet_find_parent(hp, vdev->mp, vdev);
<------>if (IS_ERR(vp)) {
<------><------>pr_err("Cannot find port parent vnet\n");
<------><------>err = PTR_ERR(vp);
<------><------>goto err_out_put_mdesc;
<------>}
 
<------>rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
<------>err = -ENODEV;
<------>if (!rmac) {
<------><------>pr_err("Port lacks %s property\n", remote_macaddr_prop);
<------><------>goto err_out_put_mdesc;
<------>}
 
<------>port = kzalloc(sizeof(*port), GFP_KERNEL);
<------>err = -ENOMEM;
<------>if (!port)
<------><------>goto err_out_put_mdesc;
 
<------>for (i = 0; i < ETH_ALEN; i++)
<------><------>port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
 
<------>port->vp = vp;
 
<------>err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
<------><------><------>      vnet_versions, ARRAY_SIZE(vnet_versions),
<------><------><------>      &vnet_vio_ops, vp->dev->name);
<------>if (err)
<------><------>goto err_out_free_port;
 
<------>err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
<------>if (err)
<------><------>goto err_out_free_port;
 
<------>netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
<------><------>       NAPI_POLL_WEIGHT);
 
<------>INIT_HLIST_NODE(&port->hash);
<------>INIT_LIST_HEAD(&port->list);
 
<------>switch_port = 0;
<------>if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
<------><------>switch_port = 1;
<------>port->switch_port = switch_port;
<------>port->tso = true;
<------>port->tsolen = 0;
 
<------>spin_lock_irqsave(&vp->lock, flags);
<------>if (switch_port)
<------><------>list_add_rcu(&port->list, &vp->port_list);
<------>else
<------><------>list_add_tail_rcu(&port->list, &vp->port_list);
<------>hlist_add_head_rcu(&port->hash,
<------><------><------>   &vp->port_hash[vnet_hashfn(port->raddr)]);
<------>sunvnet_port_add_txq_common(port);
<------>spin_unlock_irqrestore(&vp->lock, flags);
 
<------>dev_set_drvdata(&vdev->dev, port);
 
<------>pr_info("%s: PORT ( remote-mac %pM%s )\n",
<------><------>vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
 
<------>timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
 
<------>napi_enable(&port->napi);
<------>vio_port_up(&port->vio);
 
<------>mdesc_release(hp);
 
<------>return 0;
 
err_out_free_port:
<------>kfree(port);
 
err_out_put_mdesc:
<------>mdesc_release(hp);
<------>return err;
}
 
static int vnet_port_remove(struct vio_dev *vdev)
{
<------>struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 
<------>if (port) {
<------><------>del_timer_sync(&port->vio.timer);
 
<------><------>napi_disable(&port->napi);
 
<------><------>list_del_rcu(&port->list);
<------><------>hlist_del_rcu(&port->hash);
 
<------><------>synchronize_rcu();
<------><------>del_timer_sync(&port->clean_timer);
<------><------>sunvnet_port_rm_txq_common(port);
<------><------>netif_napi_del(&port->napi);
<------><------>sunvnet_port_free_tx_bufs_common(port);
<------><------>vio_ldc_free(&port->vio);
 
<------><------>dev_set_drvdata(&vdev->dev, NULL);
 
<------><------>kfree(port);
<------>}
<------>return 0;
}
 
static const struct vio_device_id vnet_port_match[] = {
<------>{
<------><------>.type = "vnet-port",
<------>},
<------>{},
};
MODULE_DEVICE_TABLE(vio, vnet_port_match);
 
static struct vio_driver vnet_port_driver = {
<------>.id_table	= vnet_port_match,
<------>.probe		= vnet_port_probe,
<------>.remove		= vnet_port_remove,
<------>.name		= "vnet_port",
};
 
static int __init vnet_init(void)
{
<------>pr_info("%s\n", version);
<------>return vio_register_driver(&vnet_port_driver);
}
 
static void __exit vnet_exit(void)
{
<------>vio_unregister_driver(&vnet_port_driver);
<------>vnet_cleanup();
}
 
module_init(vnet_init);
module_exit(vnet_exit);