841 lines
23 KiB
C
841 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2018, Intel Corporation. */
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/* This provides a net_failover interface for paravirtual drivers to
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* provide an alternate datapath by exporting APIs to create and
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* destroy a upper 'net_failover' netdev. The upper dev manages the
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* original paravirtual interface as a 'standby' netdev and uses the
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* generic failover infrastructure to register and manage a direct
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* attached VF as a 'primary' netdev. This enables live migration of
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* a VM with direct attached VF by failing over to the paravirtual
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* datapath when the VF is unplugged.
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*
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* Some of the netdev management routines are based on bond/team driver as
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* this driver provides active-backup functionality similar to those drivers.
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*/
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/netpoll.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_vlan.h>
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#include <linux/pci.h>
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#include <net/sch_generic.h>
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#include <uapi/linux/if_arp.h>
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#include <net/net_failover.h>
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static bool net_failover_xmit_ready(struct net_device *dev)
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{
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return netif_running(dev) && netif_carrier_ok(dev);
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}
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static int net_failover_open(struct net_device *dev)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev, *standby_dev;
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int err;
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primary_dev = rtnl_dereference(nfo_info->primary_dev);
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if (primary_dev) {
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err = dev_open(primary_dev, NULL);
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if (err)
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goto err_primary_open;
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}
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standby_dev = rtnl_dereference(nfo_info->standby_dev);
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if (standby_dev) {
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err = dev_open(standby_dev, NULL);
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if (err)
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goto err_standby_open;
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}
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if ((primary_dev && net_failover_xmit_ready(primary_dev)) ||
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(standby_dev && net_failover_xmit_ready(standby_dev))) {
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netif_carrier_on(dev);
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netif_tx_wake_all_queues(dev);
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}
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return 0;
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err_standby_open:
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dev_close(primary_dev);
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err_primary_open:
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netif_tx_disable(dev);
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return err;
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}
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static int net_failover_close(struct net_device *dev)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *slave_dev;
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netif_tx_disable(dev);
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slave_dev = rtnl_dereference(nfo_info->primary_dev);
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if (slave_dev)
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dev_close(slave_dev);
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slave_dev = rtnl_dereference(nfo_info->standby_dev);
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if (slave_dev)
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dev_close(slave_dev);
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return 0;
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}
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static netdev_tx_t net_failover_drop_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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atomic_long_inc(&dev->tx_dropped);
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dev_kfree_skb_any(skb);
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return NETDEV_TX_OK;
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}
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static netdev_tx_t net_failover_start_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *xmit_dev;
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/* Try xmit via primary netdev followed by standby netdev */
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xmit_dev = rcu_dereference_bh(nfo_info->primary_dev);
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if (!xmit_dev || !net_failover_xmit_ready(xmit_dev)) {
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xmit_dev = rcu_dereference_bh(nfo_info->standby_dev);
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if (!xmit_dev || !net_failover_xmit_ready(xmit_dev))
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return net_failover_drop_xmit(skb, dev);
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}
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skb->dev = xmit_dev;
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skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
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return dev_queue_xmit(skb);
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}
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static u16 net_failover_select_queue(struct net_device *dev,
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struct sk_buff *skb,
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struct net_device *sb_dev)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev;
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u16 txq;
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primary_dev = rcu_dereference(nfo_info->primary_dev);
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if (primary_dev) {
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const struct net_device_ops *ops = primary_dev->netdev_ops;
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if (ops->ndo_select_queue)
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txq = ops->ndo_select_queue(primary_dev, skb, sb_dev);
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else
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txq = netdev_pick_tx(primary_dev, skb, NULL);
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qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
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return txq;
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}
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txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
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/* Save the original txq to restore before passing to the driver */
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qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
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if (unlikely(txq >= dev->real_num_tx_queues)) {
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do {
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txq -= dev->real_num_tx_queues;
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} while (txq >= dev->real_num_tx_queues);
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}
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return txq;
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}
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/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
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* that some drivers can provide 32bit values only.
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*/
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static void net_failover_fold_stats(struct rtnl_link_stats64 *_res,
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const struct rtnl_link_stats64 *_new,
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const struct rtnl_link_stats64 *_old)
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{
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const u64 *new = (const u64 *)_new;
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const u64 *old = (const u64 *)_old;
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u64 *res = (u64 *)_res;
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int i;
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for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
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u64 nv = new[i];
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u64 ov = old[i];
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s64 delta = nv - ov;
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/* detects if this particular field is 32bit only */
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if (((nv | ov) >> 32) == 0)
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delta = (s64)(s32)((u32)nv - (u32)ov);
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/* filter anomalies, some drivers reset their stats
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* at down/up events.
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*/
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if (delta > 0)
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res[i] += delta;
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}
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}
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static void net_failover_get_stats(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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const struct rtnl_link_stats64 *new;
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struct rtnl_link_stats64 temp;
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struct net_device *slave_dev;
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spin_lock(&nfo_info->stats_lock);
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memcpy(stats, &nfo_info->failover_stats, sizeof(*stats));
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rcu_read_lock();
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slave_dev = rcu_dereference(nfo_info->primary_dev);
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if (slave_dev) {
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new = dev_get_stats(slave_dev, &temp);
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net_failover_fold_stats(stats, new, &nfo_info->primary_stats);
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memcpy(&nfo_info->primary_stats, new, sizeof(*new));
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}
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slave_dev = rcu_dereference(nfo_info->standby_dev);
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if (slave_dev) {
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new = dev_get_stats(slave_dev, &temp);
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net_failover_fold_stats(stats, new, &nfo_info->standby_stats);
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memcpy(&nfo_info->standby_stats, new, sizeof(*new));
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}
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rcu_read_unlock();
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memcpy(&nfo_info->failover_stats, stats, sizeof(*stats));
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spin_unlock(&nfo_info->stats_lock);
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}
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static int net_failover_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev, *standby_dev;
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int ret = 0;
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primary_dev = rtnl_dereference(nfo_info->primary_dev);
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if (primary_dev) {
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ret = dev_set_mtu(primary_dev, new_mtu);
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if (ret)
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return ret;
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}
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standby_dev = rtnl_dereference(nfo_info->standby_dev);
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if (standby_dev) {
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ret = dev_set_mtu(standby_dev, new_mtu);
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if (ret) {
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if (primary_dev)
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dev_set_mtu(primary_dev, dev->mtu);
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return ret;
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}
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}
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dev->mtu = new_mtu;
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return 0;
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}
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static void net_failover_set_rx_mode(struct net_device *dev)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *slave_dev;
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rcu_read_lock();
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slave_dev = rcu_dereference(nfo_info->primary_dev);
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if (slave_dev) {
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dev_uc_sync_multiple(slave_dev, dev);
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dev_mc_sync_multiple(slave_dev, dev);
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}
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slave_dev = rcu_dereference(nfo_info->standby_dev);
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if (slave_dev) {
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dev_uc_sync_multiple(slave_dev, dev);
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dev_mc_sync_multiple(slave_dev, dev);
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}
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rcu_read_unlock();
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}
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static int net_failover_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
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u16 vid)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev, *standby_dev;
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int ret = 0;
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primary_dev = rcu_dereference(nfo_info->primary_dev);
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if (primary_dev) {
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ret = vlan_vid_add(primary_dev, proto, vid);
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if (ret)
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return ret;
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}
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standby_dev = rcu_dereference(nfo_info->standby_dev);
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if (standby_dev) {
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ret = vlan_vid_add(standby_dev, proto, vid);
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if (ret)
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if (primary_dev)
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vlan_vid_del(primary_dev, proto, vid);
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}
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return ret;
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}
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static int net_failover_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
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u16 vid)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *slave_dev;
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slave_dev = rcu_dereference(nfo_info->primary_dev);
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if (slave_dev)
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vlan_vid_del(slave_dev, proto, vid);
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slave_dev = rcu_dereference(nfo_info->standby_dev);
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if (slave_dev)
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vlan_vid_del(slave_dev, proto, vid);
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return 0;
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}
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static const struct net_device_ops failover_dev_ops = {
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.ndo_open = net_failover_open,
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.ndo_stop = net_failover_close,
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.ndo_start_xmit = net_failover_start_xmit,
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.ndo_select_queue = net_failover_select_queue,
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.ndo_get_stats64 = net_failover_get_stats,
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.ndo_change_mtu = net_failover_change_mtu,
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.ndo_set_rx_mode = net_failover_set_rx_mode,
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.ndo_vlan_rx_add_vid = net_failover_vlan_rx_add_vid,
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.ndo_vlan_rx_kill_vid = net_failover_vlan_rx_kill_vid,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_features_check = passthru_features_check,
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};
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#define FAILOVER_NAME "net_failover"
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#define FAILOVER_VERSION "0.1"
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static void nfo_ethtool_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *drvinfo)
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{
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strlcpy(drvinfo->driver, FAILOVER_NAME, sizeof(drvinfo->driver));
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strlcpy(drvinfo->version, FAILOVER_VERSION, sizeof(drvinfo->version));
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}
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static int nfo_ethtool_get_link_ksettings(struct net_device *dev,
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struct ethtool_link_ksettings *cmd)
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{
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *slave_dev;
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slave_dev = rtnl_dereference(nfo_info->primary_dev);
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if (!slave_dev || !net_failover_xmit_ready(slave_dev)) {
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slave_dev = rtnl_dereference(nfo_info->standby_dev);
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if (!slave_dev || !net_failover_xmit_ready(slave_dev)) {
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cmd->base.duplex = DUPLEX_UNKNOWN;
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cmd->base.port = PORT_OTHER;
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cmd->base.speed = SPEED_UNKNOWN;
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return 0;
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}
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}
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return __ethtool_get_link_ksettings(slave_dev, cmd);
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}
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static const struct ethtool_ops failover_ethtool_ops = {
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.get_drvinfo = nfo_ethtool_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_link_ksettings = nfo_ethtool_get_link_ksettings,
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};
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/* Called when slave dev is injecting data into network stack.
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* Change the associated network device from lower dev to failover dev.
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* note: already called with rcu_read_lock
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*/
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static rx_handler_result_t net_failover_handle_frame(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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struct net_device *dev = rcu_dereference(skb->dev->rx_handler_data);
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev, *standby_dev;
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primary_dev = rcu_dereference(nfo_info->primary_dev);
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standby_dev = rcu_dereference(nfo_info->standby_dev);
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if (primary_dev && skb->dev == standby_dev)
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return RX_HANDLER_EXACT;
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skb->dev = dev;
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return RX_HANDLER_ANOTHER;
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}
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static void net_failover_compute_features(struct net_device *dev)
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{
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netdev_features_t vlan_features = FAILOVER_VLAN_FEATURES &
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NETIF_F_ALL_FOR_ALL;
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netdev_features_t enc_features = FAILOVER_ENC_FEATURES;
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unsigned short max_hard_header_len = ETH_HLEN;
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unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
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IFF_XMIT_DST_RELEASE_PERM;
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struct net_failover_info *nfo_info = netdev_priv(dev);
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struct net_device *primary_dev, *standby_dev;
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primary_dev = rcu_dereference(nfo_info->primary_dev);
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if (primary_dev) {
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vlan_features =
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netdev_increment_features(vlan_features,
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primary_dev->vlan_features,
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FAILOVER_VLAN_FEATURES);
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enc_features =
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netdev_increment_features(enc_features,
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primary_dev->hw_enc_features,
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FAILOVER_ENC_FEATURES);
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dst_release_flag &= primary_dev->priv_flags;
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if (primary_dev->hard_header_len > max_hard_header_len)
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max_hard_header_len = primary_dev->hard_header_len;
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}
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standby_dev = rcu_dereference(nfo_info->standby_dev);
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if (standby_dev) {
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vlan_features =
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netdev_increment_features(vlan_features,
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standby_dev->vlan_features,
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FAILOVER_VLAN_FEATURES);
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enc_features =
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netdev_increment_features(enc_features,
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standby_dev->hw_enc_features,
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FAILOVER_ENC_FEATURES);
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dst_release_flag &= standby_dev->priv_flags;
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if (standby_dev->hard_header_len > max_hard_header_len)
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max_hard_header_len = standby_dev->hard_header_len;
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}
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dev->vlan_features = vlan_features;
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dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
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dev->hard_header_len = max_hard_header_len;
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dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
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if (dst_release_flag == (IFF_XMIT_DST_RELEASE |
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IFF_XMIT_DST_RELEASE_PERM))
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dev->priv_flags |= IFF_XMIT_DST_RELEASE;
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netdev_change_features(dev);
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}
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static void net_failover_lower_state_changed(struct net_device *slave_dev,
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struct net_device *primary_dev,
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struct net_device *standby_dev)
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{
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struct netdev_lag_lower_state_info info;
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if (netif_carrier_ok(slave_dev))
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info.link_up = true;
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else
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info.link_up = false;
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if (slave_dev == primary_dev) {
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if (netif_running(primary_dev))
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info.tx_enabled = true;
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else
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info.tx_enabled = false;
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} else {
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if ((primary_dev && netif_running(primary_dev)) ||
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(!netif_running(standby_dev)))
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info.tx_enabled = false;
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else
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info.tx_enabled = true;
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}
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netdev_lower_state_changed(slave_dev, &info);
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}
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static int net_failover_slave_pre_register(struct net_device *slave_dev,
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struct net_device *failover_dev)
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{
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struct net_device *standby_dev, *primary_dev;
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struct net_failover_info *nfo_info;
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bool slave_is_standby;
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nfo_info = netdev_priv(failover_dev);
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standby_dev = rtnl_dereference(nfo_info->standby_dev);
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primary_dev = rtnl_dereference(nfo_info->primary_dev);
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slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
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if (slave_is_standby ? standby_dev : primary_dev) {
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netdev_err(failover_dev, "%s attempting to register as slave dev when %s already present\n",
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slave_dev->name,
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slave_is_standby ? "standby" : "primary");
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return -EINVAL;
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}
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/* We want to allow only a direct attached VF device as a primary
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|
* netdev. As there is no easy way to check for a VF device, restrict
|
|
* this to a pci device.
|
|
*/
|
|
if (!slave_is_standby && (!slave_dev->dev.parent ||
|
|
!dev_is_pci(slave_dev->dev.parent)))
|
|
return -EINVAL;
|
|
|
|
if (failover_dev->features & NETIF_F_VLAN_CHALLENGED &&
|
|
vlan_uses_dev(failover_dev)) {
|
|
netdev_err(failover_dev, "Device %s is VLAN challenged and failover device has VLAN set up\n",
|
|
failover_dev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_failover_slave_register(struct net_device *slave_dev,
|
|
struct net_device *failover_dev)
|
|
{
|
|
struct net_device *standby_dev, *primary_dev;
|
|
struct net_failover_info *nfo_info;
|
|
bool slave_is_standby;
|
|
u32 orig_mtu;
|
|
int err;
|
|
|
|
/* Align MTU of slave with failover dev */
|
|
orig_mtu = slave_dev->mtu;
|
|
err = dev_set_mtu(slave_dev, failover_dev->mtu);
|
|
if (err) {
|
|
netdev_err(failover_dev, "unable to change mtu of %s to %u register failed\n",
|
|
slave_dev->name, failover_dev->mtu);
|
|
goto done;
|
|
}
|
|
|
|
dev_hold(slave_dev);
|
|
|
|
if (netif_running(failover_dev)) {
|
|
err = dev_open(slave_dev, NULL);
|
|
if (err && (err != -EBUSY)) {
|
|
netdev_err(failover_dev, "Opening slave %s failed err:%d\n",
|
|
slave_dev->name, err);
|
|
goto err_dev_open;
|
|
}
|
|
}
|
|
|
|
netif_addr_lock_bh(failover_dev);
|
|
dev_uc_sync_multiple(slave_dev, failover_dev);
|
|
dev_mc_sync_multiple(slave_dev, failover_dev);
|
|
netif_addr_unlock_bh(failover_dev);
|
|
|
|
err = vlan_vids_add_by_dev(slave_dev, failover_dev);
|
|
if (err) {
|
|
netdev_err(failover_dev, "Failed to add vlan ids to device %s err:%d\n",
|
|
slave_dev->name, err);
|
|
goto err_vlan_add;
|
|
}
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
standby_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
primary_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
|
|
|
|
if (slave_is_standby) {
|
|
rcu_assign_pointer(nfo_info->standby_dev, slave_dev);
|
|
standby_dev = slave_dev;
|
|
dev_get_stats(standby_dev, &nfo_info->standby_stats);
|
|
} else {
|
|
rcu_assign_pointer(nfo_info->primary_dev, slave_dev);
|
|
primary_dev = slave_dev;
|
|
dev_get_stats(primary_dev, &nfo_info->primary_stats);
|
|
failover_dev->min_mtu = slave_dev->min_mtu;
|
|
failover_dev->max_mtu = slave_dev->max_mtu;
|
|
}
|
|
|
|
net_failover_lower_state_changed(slave_dev, primary_dev, standby_dev);
|
|
net_failover_compute_features(failover_dev);
|
|
|
|
call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
|
|
|
|
netdev_info(failover_dev, "failover %s slave:%s registered\n",
|
|
slave_is_standby ? "standby" : "primary", slave_dev->name);
|
|
|
|
return 0;
|
|
|
|
err_vlan_add:
|
|
dev_uc_unsync(slave_dev, failover_dev);
|
|
dev_mc_unsync(slave_dev, failover_dev);
|
|
dev_close(slave_dev);
|
|
err_dev_open:
|
|
dev_put(slave_dev);
|
|
dev_set_mtu(slave_dev, orig_mtu);
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static int net_failover_slave_pre_unregister(struct net_device *slave_dev,
|
|
struct net_device *failover_dev)
|
|
{
|
|
struct net_device *standby_dev, *primary_dev;
|
|
struct net_failover_info *nfo_info;
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
primary_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
standby_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
|
|
if (slave_dev != primary_dev && slave_dev != standby_dev)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_failover_slave_unregister(struct net_device *slave_dev,
|
|
struct net_device *failover_dev)
|
|
{
|
|
struct net_device *standby_dev, *primary_dev;
|
|
struct net_failover_info *nfo_info;
|
|
bool slave_is_standby;
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
primary_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
standby_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
|
|
if (WARN_ON_ONCE(slave_dev != primary_dev && slave_dev != standby_dev))
|
|
return -ENODEV;
|
|
|
|
vlan_vids_del_by_dev(slave_dev, failover_dev);
|
|
dev_uc_unsync(slave_dev, failover_dev);
|
|
dev_mc_unsync(slave_dev, failover_dev);
|
|
dev_close(slave_dev);
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
dev_get_stats(failover_dev, &nfo_info->failover_stats);
|
|
|
|
slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
|
|
if (slave_is_standby) {
|
|
RCU_INIT_POINTER(nfo_info->standby_dev, NULL);
|
|
} else {
|
|
RCU_INIT_POINTER(nfo_info->primary_dev, NULL);
|
|
if (standby_dev) {
|
|
failover_dev->min_mtu = standby_dev->min_mtu;
|
|
failover_dev->max_mtu = standby_dev->max_mtu;
|
|
}
|
|
}
|
|
|
|
dev_put(slave_dev);
|
|
|
|
net_failover_compute_features(failover_dev);
|
|
|
|
netdev_info(failover_dev, "failover %s slave:%s unregistered\n",
|
|
slave_is_standby ? "standby" : "primary", slave_dev->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_failover_slave_link_change(struct net_device *slave_dev,
|
|
struct net_device *failover_dev)
|
|
{
|
|
struct net_device *primary_dev, *standby_dev;
|
|
struct net_failover_info *nfo_info;
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
|
|
primary_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
standby_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
|
|
if (slave_dev != primary_dev && slave_dev != standby_dev)
|
|
return -ENODEV;
|
|
|
|
if ((primary_dev && net_failover_xmit_ready(primary_dev)) ||
|
|
(standby_dev && net_failover_xmit_ready(standby_dev))) {
|
|
netif_carrier_on(failover_dev);
|
|
netif_tx_wake_all_queues(failover_dev);
|
|
} else {
|
|
dev_get_stats(failover_dev, &nfo_info->failover_stats);
|
|
netif_carrier_off(failover_dev);
|
|
netif_tx_stop_all_queues(failover_dev);
|
|
}
|
|
|
|
net_failover_lower_state_changed(slave_dev, primary_dev, standby_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_failover_slave_name_change(struct net_device *slave_dev,
|
|
struct net_device *failover_dev)
|
|
{
|
|
struct net_device *primary_dev, *standby_dev;
|
|
struct net_failover_info *nfo_info;
|
|
|
|
nfo_info = netdev_priv(failover_dev);
|
|
|
|
primary_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
standby_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
|
|
if (slave_dev != primary_dev && slave_dev != standby_dev)
|
|
return -ENODEV;
|
|
|
|
/* We need to bring up the slave after the rename by udev in case
|
|
* open failed with EBUSY when it was registered.
|
|
*/
|
|
dev_open(slave_dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct failover_ops net_failover_ops = {
|
|
.slave_pre_register = net_failover_slave_pre_register,
|
|
.slave_register = net_failover_slave_register,
|
|
.slave_pre_unregister = net_failover_slave_pre_unregister,
|
|
.slave_unregister = net_failover_slave_unregister,
|
|
.slave_link_change = net_failover_slave_link_change,
|
|
.slave_name_change = net_failover_slave_name_change,
|
|
.slave_handle_frame = net_failover_handle_frame,
|
|
};
|
|
|
|
/**
|
|
* net_failover_create - Create and register a failover instance
|
|
*
|
|
* @dev: standby netdev
|
|
*
|
|
* Creates a failover netdev and registers a failover instance for a standby
|
|
* netdev. Used by paravirtual drivers that use 3-netdev model.
|
|
* The failover netdev acts as a master device and controls 2 slave devices -
|
|
* the original standby netdev and a VF netdev with the same MAC gets
|
|
* registered as primary netdev.
|
|
*
|
|
* Return: pointer to failover instance
|
|
*/
|
|
struct failover *net_failover_create(struct net_device *standby_dev)
|
|
{
|
|
struct device *dev = standby_dev->dev.parent;
|
|
struct net_device *failover_dev;
|
|
struct failover *failover;
|
|
int err;
|
|
|
|
/* Alloc at least 2 queues, for now we are going with 16 assuming
|
|
* that VF devices being enslaved won't have too many queues.
|
|
*/
|
|
failover_dev = alloc_etherdev_mq(sizeof(struct net_failover_info), 16);
|
|
if (!failover_dev) {
|
|
dev_err(dev, "Unable to allocate failover_netdev!\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
dev_net_set(failover_dev, dev_net(standby_dev));
|
|
SET_NETDEV_DEV(failover_dev, dev);
|
|
|
|
failover_dev->netdev_ops = &failover_dev_ops;
|
|
failover_dev->ethtool_ops = &failover_ethtool_ops;
|
|
|
|
/* Initialize the device options */
|
|
failover_dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
|
|
failover_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE |
|
|
IFF_TX_SKB_SHARING);
|
|
|
|
/* don't acquire failover netdev's netif_tx_lock when transmitting */
|
|
failover_dev->features |= NETIF_F_LLTX;
|
|
|
|
/* Don't allow failover devices to change network namespaces. */
|
|
failover_dev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
failover_dev->hw_features = FAILOVER_VLAN_FEATURES |
|
|
NETIF_F_HW_VLAN_CTAG_TX |
|
|
NETIF_F_HW_VLAN_CTAG_RX |
|
|
NETIF_F_HW_VLAN_CTAG_FILTER;
|
|
|
|
failover_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
|
|
failover_dev->features |= failover_dev->hw_features;
|
|
|
|
memcpy(failover_dev->dev_addr, standby_dev->dev_addr,
|
|
failover_dev->addr_len);
|
|
|
|
failover_dev->min_mtu = standby_dev->min_mtu;
|
|
failover_dev->max_mtu = standby_dev->max_mtu;
|
|
|
|
err = register_netdev(failover_dev);
|
|
if (err) {
|
|
dev_err(dev, "Unable to register failover_dev!\n");
|
|
goto err_register_netdev;
|
|
}
|
|
|
|
netif_carrier_off(failover_dev);
|
|
|
|
failover = failover_register(failover_dev, &net_failover_ops);
|
|
if (IS_ERR(failover)) {
|
|
err = PTR_ERR(failover);
|
|
goto err_failover_register;
|
|
}
|
|
|
|
return failover;
|
|
|
|
err_failover_register:
|
|
unregister_netdev(failover_dev);
|
|
err_register_netdev:
|
|
free_netdev(failover_dev);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(net_failover_create);
|
|
|
|
/**
|
|
* net_failover_destroy - Destroy a failover instance
|
|
*
|
|
* @failover: pointer to failover instance
|
|
*
|
|
* Unregisters any slave netdevs associated with the failover instance by
|
|
* calling failover_slave_unregister().
|
|
* unregisters the failover instance itself and finally frees the failover
|
|
* netdev. Used by paravirtual drivers that use 3-netdev model.
|
|
*
|
|
*/
|
|
void net_failover_destroy(struct failover *failover)
|
|
{
|
|
struct net_failover_info *nfo_info;
|
|
struct net_device *failover_dev;
|
|
struct net_device *slave_dev;
|
|
|
|
if (!failover)
|
|
return;
|
|
|
|
failover_dev = rcu_dereference(failover->failover_dev);
|
|
nfo_info = netdev_priv(failover_dev);
|
|
|
|
netif_device_detach(failover_dev);
|
|
|
|
rtnl_lock();
|
|
|
|
slave_dev = rtnl_dereference(nfo_info->primary_dev);
|
|
if (slave_dev)
|
|
failover_slave_unregister(slave_dev);
|
|
|
|
slave_dev = rtnl_dereference(nfo_info->standby_dev);
|
|
if (slave_dev)
|
|
failover_slave_unregister(slave_dev);
|
|
|
|
failover_unregister(failover);
|
|
|
|
unregister_netdevice(failover_dev);
|
|
|
|
rtnl_unlock();
|
|
|
|
free_netdev(failover_dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(net_failover_destroy);
|
|
|
|
static __init int
|
|
net_failover_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
module_init(net_failover_init);
|
|
|
|
static __exit
|
|
void net_failover_exit(void)
|
|
{
|
|
}
|
|
module_exit(net_failover_exit);
|
|
|
|
MODULE_DESCRIPTION("Failover driver for Paravirtual drivers");
|
|
MODULE_LICENSE("GPL v2");
|