1cfc80d9aSSridhar Samudrala // SPDX-License-Identifier: GPL-2.0 2cfc80d9aSSridhar Samudrala /* Copyright (c) 2018, Intel Corporation. */ 3cfc80d9aSSridhar Samudrala 4cfc80d9aSSridhar Samudrala /* This provides a net_failover interface for paravirtual drivers to 5cfc80d9aSSridhar Samudrala * provide an alternate datapath by exporting APIs to create and 6cfc80d9aSSridhar Samudrala * destroy a upper 'net_failover' netdev. The upper dev manages the 7cfc80d9aSSridhar Samudrala * original paravirtual interface as a 'standby' netdev and uses the 8cfc80d9aSSridhar Samudrala * generic failover infrastructure to register and manage a direct 9cfc80d9aSSridhar Samudrala * attached VF as a 'primary' netdev. This enables live migration of 10cfc80d9aSSridhar Samudrala * a VM with direct attached VF by failing over to the paravirtual 11cfc80d9aSSridhar Samudrala * datapath when the VF is unplugged. 12cfc80d9aSSridhar Samudrala * 13cfc80d9aSSridhar Samudrala * Some of the netdev management routines are based on bond/team driver as 14cfc80d9aSSridhar Samudrala * this driver provides active-backup functionality similar to those drivers. 15cfc80d9aSSridhar Samudrala */ 16cfc80d9aSSridhar Samudrala 17cfc80d9aSSridhar Samudrala #include <linux/netdevice.h> 18cfc80d9aSSridhar Samudrala #include <linux/etherdevice.h> 19cfc80d9aSSridhar Samudrala #include <linux/ethtool.h> 20cfc80d9aSSridhar Samudrala #include <linux/module.h> 21cfc80d9aSSridhar Samudrala #include <linux/slab.h> 22cfc80d9aSSridhar Samudrala #include <linux/netpoll.h> 23cfc80d9aSSridhar Samudrala #include <linux/rtnetlink.h> 24cfc80d9aSSridhar Samudrala #include <linux/if_vlan.h> 25cfc80d9aSSridhar Samudrala #include <linux/pci.h> 26cfc80d9aSSridhar Samudrala #include <net/sch_generic.h> 27cfc80d9aSSridhar Samudrala #include <uapi/linux/if_arp.h> 28cfc80d9aSSridhar Samudrala #include <net/net_failover.h> 29cfc80d9aSSridhar Samudrala 30cfc80d9aSSridhar Samudrala static bool net_failover_xmit_ready(struct net_device *dev) 31cfc80d9aSSridhar Samudrala { 32cfc80d9aSSridhar Samudrala return netif_running(dev) && netif_carrier_ok(dev); 33cfc80d9aSSridhar Samudrala } 34cfc80d9aSSridhar Samudrala 35cfc80d9aSSridhar Samudrala static int net_failover_open(struct net_device *dev) 36cfc80d9aSSridhar Samudrala { 37cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 38cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 39cfc80d9aSSridhar Samudrala int err; 40cfc80d9aSSridhar Samudrala 41cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 42cfc80d9aSSridhar Samudrala if (primary_dev) { 4300f54e68SPetr Machata err = dev_open(primary_dev, NULL); 44cfc80d9aSSridhar Samudrala if (err) 45cfc80d9aSSridhar Samudrala goto err_primary_open; 46cfc80d9aSSridhar Samudrala } 47cfc80d9aSSridhar Samudrala 48cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 49cfc80d9aSSridhar Samudrala if (standby_dev) { 5000f54e68SPetr Machata err = dev_open(standby_dev, NULL); 51cfc80d9aSSridhar Samudrala if (err) 52cfc80d9aSSridhar Samudrala goto err_standby_open; 53cfc80d9aSSridhar Samudrala } 54cfc80d9aSSridhar Samudrala 55cfc80d9aSSridhar Samudrala if ((primary_dev && net_failover_xmit_ready(primary_dev)) || 56cfc80d9aSSridhar Samudrala (standby_dev && net_failover_xmit_ready(standby_dev))) { 57cfc80d9aSSridhar Samudrala netif_carrier_on(dev); 58cfc80d9aSSridhar Samudrala netif_tx_wake_all_queues(dev); 59cfc80d9aSSridhar Samudrala } 60cfc80d9aSSridhar Samudrala 61cfc80d9aSSridhar Samudrala return 0; 62cfc80d9aSSridhar Samudrala 63cfc80d9aSSridhar Samudrala err_standby_open: 64e8224bfeSVasily Averin if (primary_dev) 65cfc80d9aSSridhar Samudrala dev_close(primary_dev); 66cfc80d9aSSridhar Samudrala err_primary_open: 67cfc80d9aSSridhar Samudrala netif_tx_disable(dev); 68cfc80d9aSSridhar Samudrala return err; 69cfc80d9aSSridhar Samudrala } 70cfc80d9aSSridhar Samudrala 71cfc80d9aSSridhar Samudrala static int net_failover_close(struct net_device *dev) 72cfc80d9aSSridhar Samudrala { 73cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 74cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 75cfc80d9aSSridhar Samudrala 76cfc80d9aSSridhar Samudrala netif_tx_disable(dev); 77cfc80d9aSSridhar Samudrala 78cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->primary_dev); 79cfc80d9aSSridhar Samudrala if (slave_dev) 80cfc80d9aSSridhar Samudrala dev_close(slave_dev); 81cfc80d9aSSridhar Samudrala 82cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->standby_dev); 83cfc80d9aSSridhar Samudrala if (slave_dev) 84cfc80d9aSSridhar Samudrala dev_close(slave_dev); 85cfc80d9aSSridhar Samudrala 86cfc80d9aSSridhar Samudrala return 0; 87cfc80d9aSSridhar Samudrala } 88cfc80d9aSSridhar Samudrala 89cfc80d9aSSridhar Samudrala static netdev_tx_t net_failover_drop_xmit(struct sk_buff *skb, 90cfc80d9aSSridhar Samudrala struct net_device *dev) 91cfc80d9aSSridhar Samudrala { 92*625788b5SEric Dumazet dev_core_stats_tx_dropped_inc(dev); 93cfc80d9aSSridhar Samudrala dev_kfree_skb_any(skb); 94cfc80d9aSSridhar Samudrala return NETDEV_TX_OK; 95cfc80d9aSSridhar Samudrala } 96cfc80d9aSSridhar Samudrala 97cfc80d9aSSridhar Samudrala static netdev_tx_t net_failover_start_xmit(struct sk_buff *skb, 98cfc80d9aSSridhar Samudrala struct net_device *dev) 99cfc80d9aSSridhar Samudrala { 100cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 101cfc80d9aSSridhar Samudrala struct net_device *xmit_dev; 102cfc80d9aSSridhar Samudrala 103cfc80d9aSSridhar Samudrala /* Try xmit via primary netdev followed by standby netdev */ 104cfc80d9aSSridhar Samudrala xmit_dev = rcu_dereference_bh(nfo_info->primary_dev); 105cfc80d9aSSridhar Samudrala if (!xmit_dev || !net_failover_xmit_ready(xmit_dev)) { 106cfc80d9aSSridhar Samudrala xmit_dev = rcu_dereference_bh(nfo_info->standby_dev); 107cfc80d9aSSridhar Samudrala if (!xmit_dev || !net_failover_xmit_ready(xmit_dev)) 108cfc80d9aSSridhar Samudrala return net_failover_drop_xmit(skb, dev); 109cfc80d9aSSridhar Samudrala } 110cfc80d9aSSridhar Samudrala 111cfc80d9aSSridhar Samudrala skb->dev = xmit_dev; 112cfc80d9aSSridhar Samudrala skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 113cfc80d9aSSridhar Samudrala 114cfc80d9aSSridhar Samudrala return dev_queue_xmit(skb); 115cfc80d9aSSridhar Samudrala } 116cfc80d9aSSridhar Samudrala 117cfc80d9aSSridhar Samudrala static u16 net_failover_select_queue(struct net_device *dev, 1184f49dec9SAlexander Duyck struct sk_buff *skb, 119a350ecceSPaolo Abeni struct net_device *sb_dev) 120cfc80d9aSSridhar Samudrala { 121cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 122cfc80d9aSSridhar Samudrala struct net_device *primary_dev; 123cfc80d9aSSridhar Samudrala u16 txq; 124cfc80d9aSSridhar Samudrala 125cfc80d9aSSridhar Samudrala primary_dev = rcu_dereference(nfo_info->primary_dev); 126cfc80d9aSSridhar Samudrala if (primary_dev) { 127cfc80d9aSSridhar Samudrala const struct net_device_ops *ops = primary_dev->netdev_ops; 128cfc80d9aSSridhar Samudrala 129cfc80d9aSSridhar Samudrala if (ops->ndo_select_queue) 130a350ecceSPaolo Abeni txq = ops->ndo_select_queue(primary_dev, skb, sb_dev); 131cfc80d9aSSridhar Samudrala else 132a350ecceSPaolo Abeni txq = netdev_pick_tx(primary_dev, skb, NULL); 133cfc80d9aSSridhar Samudrala 134cfc80d9aSSridhar Samudrala qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 135cfc80d9aSSridhar Samudrala 136cfc80d9aSSridhar Samudrala return txq; 137cfc80d9aSSridhar Samudrala } 138cfc80d9aSSridhar Samudrala 139cfc80d9aSSridhar Samudrala txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 140cfc80d9aSSridhar Samudrala 141cfc80d9aSSridhar Samudrala /* Save the original txq to restore before passing to the driver */ 142cfc80d9aSSridhar Samudrala qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 143cfc80d9aSSridhar Samudrala 144cfc80d9aSSridhar Samudrala if (unlikely(txq >= dev->real_num_tx_queues)) { 145cfc80d9aSSridhar Samudrala do { 146cfc80d9aSSridhar Samudrala txq -= dev->real_num_tx_queues; 147cfc80d9aSSridhar Samudrala } while (txq >= dev->real_num_tx_queues); 148cfc80d9aSSridhar Samudrala } 149cfc80d9aSSridhar Samudrala 150cfc80d9aSSridhar Samudrala return txq; 151cfc80d9aSSridhar Samudrala } 152cfc80d9aSSridhar Samudrala 153cfc80d9aSSridhar Samudrala /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 154cfc80d9aSSridhar Samudrala * that some drivers can provide 32bit values only. 155cfc80d9aSSridhar Samudrala */ 156cfc80d9aSSridhar Samudrala static void net_failover_fold_stats(struct rtnl_link_stats64 *_res, 157cfc80d9aSSridhar Samudrala const struct rtnl_link_stats64 *_new, 158cfc80d9aSSridhar Samudrala const struct rtnl_link_stats64 *_old) 159cfc80d9aSSridhar Samudrala { 160cfc80d9aSSridhar Samudrala const u64 *new = (const u64 *)_new; 161cfc80d9aSSridhar Samudrala const u64 *old = (const u64 *)_old; 162cfc80d9aSSridhar Samudrala u64 *res = (u64 *)_res; 163cfc80d9aSSridhar Samudrala int i; 164cfc80d9aSSridhar Samudrala 165cfc80d9aSSridhar Samudrala for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 166cfc80d9aSSridhar Samudrala u64 nv = new[i]; 167cfc80d9aSSridhar Samudrala u64 ov = old[i]; 168cfc80d9aSSridhar Samudrala s64 delta = nv - ov; 169cfc80d9aSSridhar Samudrala 170cfc80d9aSSridhar Samudrala /* detects if this particular field is 32bit only */ 171cfc80d9aSSridhar Samudrala if (((nv | ov) >> 32) == 0) 172cfc80d9aSSridhar Samudrala delta = (s64)(s32)((u32)nv - (u32)ov); 173cfc80d9aSSridhar Samudrala 174cfc80d9aSSridhar Samudrala /* filter anomalies, some drivers reset their stats 175cfc80d9aSSridhar Samudrala * at down/up events. 176cfc80d9aSSridhar Samudrala */ 177cfc80d9aSSridhar Samudrala if (delta > 0) 178cfc80d9aSSridhar Samudrala res[i] += delta; 179cfc80d9aSSridhar Samudrala } 180cfc80d9aSSridhar Samudrala } 181cfc80d9aSSridhar Samudrala 182cfc80d9aSSridhar Samudrala static void net_failover_get_stats(struct net_device *dev, 183cfc80d9aSSridhar Samudrala struct rtnl_link_stats64 *stats) 184cfc80d9aSSridhar Samudrala { 185cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 186cfc80d9aSSridhar Samudrala const struct rtnl_link_stats64 *new; 187cfc80d9aSSridhar Samudrala struct rtnl_link_stats64 temp; 188cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 189cfc80d9aSSridhar Samudrala 190cfc80d9aSSridhar Samudrala spin_lock(&nfo_info->stats_lock); 191cfc80d9aSSridhar Samudrala memcpy(stats, &nfo_info->failover_stats, sizeof(*stats)); 192cfc80d9aSSridhar Samudrala 193cfc80d9aSSridhar Samudrala rcu_read_lock(); 194cfc80d9aSSridhar Samudrala 195cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->primary_dev); 196cfc80d9aSSridhar Samudrala if (slave_dev) { 197cfc80d9aSSridhar Samudrala new = dev_get_stats(slave_dev, &temp); 198cfc80d9aSSridhar Samudrala net_failover_fold_stats(stats, new, &nfo_info->primary_stats); 199cfc80d9aSSridhar Samudrala memcpy(&nfo_info->primary_stats, new, sizeof(*new)); 200cfc80d9aSSridhar Samudrala } 201cfc80d9aSSridhar Samudrala 202cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->standby_dev); 203cfc80d9aSSridhar Samudrala if (slave_dev) { 204cfc80d9aSSridhar Samudrala new = dev_get_stats(slave_dev, &temp); 205cfc80d9aSSridhar Samudrala net_failover_fold_stats(stats, new, &nfo_info->standby_stats); 206cfc80d9aSSridhar Samudrala memcpy(&nfo_info->standby_stats, new, sizeof(*new)); 207cfc80d9aSSridhar Samudrala } 208cfc80d9aSSridhar Samudrala 209cfc80d9aSSridhar Samudrala rcu_read_unlock(); 210cfc80d9aSSridhar Samudrala 211cfc80d9aSSridhar Samudrala memcpy(&nfo_info->failover_stats, stats, sizeof(*stats)); 212cfc80d9aSSridhar Samudrala spin_unlock(&nfo_info->stats_lock); 213cfc80d9aSSridhar Samudrala } 214cfc80d9aSSridhar Samudrala 215cfc80d9aSSridhar Samudrala static int net_failover_change_mtu(struct net_device *dev, int new_mtu) 216cfc80d9aSSridhar Samudrala { 217cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 218cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 219cfc80d9aSSridhar Samudrala int ret = 0; 220cfc80d9aSSridhar Samudrala 2213260155aSStephen Hemminger primary_dev = rtnl_dereference(nfo_info->primary_dev); 222cfc80d9aSSridhar Samudrala if (primary_dev) { 223cfc80d9aSSridhar Samudrala ret = dev_set_mtu(primary_dev, new_mtu); 224cfc80d9aSSridhar Samudrala if (ret) 225cfc80d9aSSridhar Samudrala return ret; 226cfc80d9aSSridhar Samudrala } 227cfc80d9aSSridhar Samudrala 2283260155aSStephen Hemminger standby_dev = rtnl_dereference(nfo_info->standby_dev); 229cfc80d9aSSridhar Samudrala if (standby_dev) { 230cfc80d9aSSridhar Samudrala ret = dev_set_mtu(standby_dev, new_mtu); 231cfc80d9aSSridhar Samudrala if (ret) { 232cfc80d9aSSridhar Samudrala if (primary_dev) 233cfc80d9aSSridhar Samudrala dev_set_mtu(primary_dev, dev->mtu); 234cfc80d9aSSridhar Samudrala return ret; 235cfc80d9aSSridhar Samudrala } 236cfc80d9aSSridhar Samudrala } 237cfc80d9aSSridhar Samudrala 238cfc80d9aSSridhar Samudrala dev->mtu = new_mtu; 239cfc80d9aSSridhar Samudrala 240cfc80d9aSSridhar Samudrala return 0; 241cfc80d9aSSridhar Samudrala } 242cfc80d9aSSridhar Samudrala 243cfc80d9aSSridhar Samudrala static void net_failover_set_rx_mode(struct net_device *dev) 244cfc80d9aSSridhar Samudrala { 245cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 246cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 247cfc80d9aSSridhar Samudrala 248cfc80d9aSSridhar Samudrala rcu_read_lock(); 249cfc80d9aSSridhar Samudrala 250cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->primary_dev); 251cfc80d9aSSridhar Samudrala if (slave_dev) { 252cfc80d9aSSridhar Samudrala dev_uc_sync_multiple(slave_dev, dev); 253cfc80d9aSSridhar Samudrala dev_mc_sync_multiple(slave_dev, dev); 254cfc80d9aSSridhar Samudrala } 255cfc80d9aSSridhar Samudrala 256cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->standby_dev); 257cfc80d9aSSridhar Samudrala if (slave_dev) { 258cfc80d9aSSridhar Samudrala dev_uc_sync_multiple(slave_dev, dev); 259cfc80d9aSSridhar Samudrala dev_mc_sync_multiple(slave_dev, dev); 260cfc80d9aSSridhar Samudrala } 261cfc80d9aSSridhar Samudrala 262cfc80d9aSSridhar Samudrala rcu_read_unlock(); 263cfc80d9aSSridhar Samudrala } 264cfc80d9aSSridhar Samudrala 265cfc80d9aSSridhar Samudrala static int net_failover_vlan_rx_add_vid(struct net_device *dev, __be16 proto, 266cfc80d9aSSridhar Samudrala u16 vid) 267cfc80d9aSSridhar Samudrala { 268cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 269cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 270cfc80d9aSSridhar Samudrala int ret = 0; 271cfc80d9aSSridhar Samudrala 272cfc80d9aSSridhar Samudrala primary_dev = rcu_dereference(nfo_info->primary_dev); 273cfc80d9aSSridhar Samudrala if (primary_dev) { 274cfc80d9aSSridhar Samudrala ret = vlan_vid_add(primary_dev, proto, vid); 275cfc80d9aSSridhar Samudrala if (ret) 276cfc80d9aSSridhar Samudrala return ret; 277cfc80d9aSSridhar Samudrala } 278cfc80d9aSSridhar Samudrala 279cfc80d9aSSridhar Samudrala standby_dev = rcu_dereference(nfo_info->standby_dev); 280cfc80d9aSSridhar Samudrala if (standby_dev) { 281cfc80d9aSSridhar Samudrala ret = vlan_vid_add(standby_dev, proto, vid); 282cfc80d9aSSridhar Samudrala if (ret) 283cfc80d9aSSridhar Samudrala if (primary_dev) 284cfc80d9aSSridhar Samudrala vlan_vid_del(primary_dev, proto, vid); 285cfc80d9aSSridhar Samudrala } 286cfc80d9aSSridhar Samudrala 287cfc80d9aSSridhar Samudrala return ret; 288cfc80d9aSSridhar Samudrala } 289cfc80d9aSSridhar Samudrala 290cfc80d9aSSridhar Samudrala static int net_failover_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 291cfc80d9aSSridhar Samudrala u16 vid) 292cfc80d9aSSridhar Samudrala { 293cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 294cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 295cfc80d9aSSridhar Samudrala 296cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->primary_dev); 297cfc80d9aSSridhar Samudrala if (slave_dev) 298cfc80d9aSSridhar Samudrala vlan_vid_del(slave_dev, proto, vid); 299cfc80d9aSSridhar Samudrala 300cfc80d9aSSridhar Samudrala slave_dev = rcu_dereference(nfo_info->standby_dev); 301cfc80d9aSSridhar Samudrala if (slave_dev) 302cfc80d9aSSridhar Samudrala vlan_vid_del(slave_dev, proto, vid); 303cfc80d9aSSridhar Samudrala 304cfc80d9aSSridhar Samudrala return 0; 305cfc80d9aSSridhar Samudrala } 306cfc80d9aSSridhar Samudrala 307cfc80d9aSSridhar Samudrala static const struct net_device_ops failover_dev_ops = { 308cfc80d9aSSridhar Samudrala .ndo_open = net_failover_open, 309cfc80d9aSSridhar Samudrala .ndo_stop = net_failover_close, 310cfc80d9aSSridhar Samudrala .ndo_start_xmit = net_failover_start_xmit, 311cfc80d9aSSridhar Samudrala .ndo_select_queue = net_failover_select_queue, 312cfc80d9aSSridhar Samudrala .ndo_get_stats64 = net_failover_get_stats, 313cfc80d9aSSridhar Samudrala .ndo_change_mtu = net_failover_change_mtu, 314cfc80d9aSSridhar Samudrala .ndo_set_rx_mode = net_failover_set_rx_mode, 315cfc80d9aSSridhar Samudrala .ndo_vlan_rx_add_vid = net_failover_vlan_rx_add_vid, 316cfc80d9aSSridhar Samudrala .ndo_vlan_rx_kill_vid = net_failover_vlan_rx_kill_vid, 317cfc80d9aSSridhar Samudrala .ndo_validate_addr = eth_validate_addr, 318cfc80d9aSSridhar Samudrala .ndo_features_check = passthru_features_check, 319cfc80d9aSSridhar Samudrala }; 320cfc80d9aSSridhar Samudrala 321cfc80d9aSSridhar Samudrala #define FAILOVER_NAME "net_failover" 322cfc80d9aSSridhar Samudrala #define FAILOVER_VERSION "0.1" 323cfc80d9aSSridhar Samudrala 324cfc80d9aSSridhar Samudrala static void nfo_ethtool_get_drvinfo(struct net_device *dev, 325cfc80d9aSSridhar Samudrala struct ethtool_drvinfo *drvinfo) 326cfc80d9aSSridhar Samudrala { 327cfc80d9aSSridhar Samudrala strlcpy(drvinfo->driver, FAILOVER_NAME, sizeof(drvinfo->driver)); 328cfc80d9aSSridhar Samudrala strlcpy(drvinfo->version, FAILOVER_VERSION, sizeof(drvinfo->version)); 329cfc80d9aSSridhar Samudrala } 330cfc80d9aSSridhar Samudrala 331cfc80d9aSSridhar Samudrala static int nfo_ethtool_get_link_ksettings(struct net_device *dev, 332cfc80d9aSSridhar Samudrala struct ethtool_link_ksettings *cmd) 333cfc80d9aSSridhar Samudrala { 334cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 335cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 336cfc80d9aSSridhar Samudrala 337cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->primary_dev); 338cfc80d9aSSridhar Samudrala if (!slave_dev || !net_failover_xmit_ready(slave_dev)) { 339cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->standby_dev); 340cfc80d9aSSridhar Samudrala if (!slave_dev || !net_failover_xmit_ready(slave_dev)) { 341cfc80d9aSSridhar Samudrala cmd->base.duplex = DUPLEX_UNKNOWN; 342cfc80d9aSSridhar Samudrala cmd->base.port = PORT_OTHER; 343cfc80d9aSSridhar Samudrala cmd->base.speed = SPEED_UNKNOWN; 344cfc80d9aSSridhar Samudrala 345cfc80d9aSSridhar Samudrala return 0; 346cfc80d9aSSridhar Samudrala } 347cfc80d9aSSridhar Samudrala } 348cfc80d9aSSridhar Samudrala 349cfc80d9aSSridhar Samudrala return __ethtool_get_link_ksettings(slave_dev, cmd); 350cfc80d9aSSridhar Samudrala } 351cfc80d9aSSridhar Samudrala 352cfc80d9aSSridhar Samudrala static const struct ethtool_ops failover_ethtool_ops = { 353cfc80d9aSSridhar Samudrala .get_drvinfo = nfo_ethtool_get_drvinfo, 354cfc80d9aSSridhar Samudrala .get_link = ethtool_op_get_link, 355cfc80d9aSSridhar Samudrala .get_link_ksettings = nfo_ethtool_get_link_ksettings, 356cfc80d9aSSridhar Samudrala }; 357cfc80d9aSSridhar Samudrala 358cfc80d9aSSridhar Samudrala /* Called when slave dev is injecting data into network stack. 359cfc80d9aSSridhar Samudrala * Change the associated network device from lower dev to failover dev. 360cfc80d9aSSridhar Samudrala * note: already called with rcu_read_lock 361cfc80d9aSSridhar Samudrala */ 362cfc80d9aSSridhar Samudrala static rx_handler_result_t net_failover_handle_frame(struct sk_buff **pskb) 363cfc80d9aSSridhar Samudrala { 364cfc80d9aSSridhar Samudrala struct sk_buff *skb = *pskb; 365cfc80d9aSSridhar Samudrala struct net_device *dev = rcu_dereference(skb->dev->rx_handler_data); 366cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 367cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 368cfc80d9aSSridhar Samudrala 369cfc80d9aSSridhar Samudrala primary_dev = rcu_dereference(nfo_info->primary_dev); 370cfc80d9aSSridhar Samudrala standby_dev = rcu_dereference(nfo_info->standby_dev); 371cfc80d9aSSridhar Samudrala 372cfc80d9aSSridhar Samudrala if (primary_dev && skb->dev == standby_dev) 373cfc80d9aSSridhar Samudrala return RX_HANDLER_EXACT; 374cfc80d9aSSridhar Samudrala 375cfc80d9aSSridhar Samudrala skb->dev = dev; 376cfc80d9aSSridhar Samudrala 377cfc80d9aSSridhar Samudrala return RX_HANDLER_ANOTHER; 378cfc80d9aSSridhar Samudrala } 379cfc80d9aSSridhar Samudrala 380cfc80d9aSSridhar Samudrala static void net_failover_compute_features(struct net_device *dev) 381cfc80d9aSSridhar Samudrala { 382a746407aSDan Carpenter netdev_features_t vlan_features = FAILOVER_VLAN_FEATURES & 383a746407aSDan Carpenter NETIF_F_ALL_FOR_ALL; 384cfc80d9aSSridhar Samudrala netdev_features_t enc_features = FAILOVER_ENC_FEATURES; 385cfc80d9aSSridhar Samudrala unsigned short max_hard_header_len = ETH_HLEN; 386cfc80d9aSSridhar Samudrala unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 387cfc80d9aSSridhar Samudrala IFF_XMIT_DST_RELEASE_PERM; 388cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info = netdev_priv(dev); 389cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 390cfc80d9aSSridhar Samudrala 391cfc80d9aSSridhar Samudrala primary_dev = rcu_dereference(nfo_info->primary_dev); 392cfc80d9aSSridhar Samudrala if (primary_dev) { 393cfc80d9aSSridhar Samudrala vlan_features = 394cfc80d9aSSridhar Samudrala netdev_increment_features(vlan_features, 395cfc80d9aSSridhar Samudrala primary_dev->vlan_features, 396cfc80d9aSSridhar Samudrala FAILOVER_VLAN_FEATURES); 397cfc80d9aSSridhar Samudrala enc_features = 398cfc80d9aSSridhar Samudrala netdev_increment_features(enc_features, 399cfc80d9aSSridhar Samudrala primary_dev->hw_enc_features, 400cfc80d9aSSridhar Samudrala FAILOVER_ENC_FEATURES); 401cfc80d9aSSridhar Samudrala 402cfc80d9aSSridhar Samudrala dst_release_flag &= primary_dev->priv_flags; 403cfc80d9aSSridhar Samudrala if (primary_dev->hard_header_len > max_hard_header_len) 404cfc80d9aSSridhar Samudrala max_hard_header_len = primary_dev->hard_header_len; 405cfc80d9aSSridhar Samudrala } 406cfc80d9aSSridhar Samudrala 407cfc80d9aSSridhar Samudrala standby_dev = rcu_dereference(nfo_info->standby_dev); 408cfc80d9aSSridhar Samudrala if (standby_dev) { 409cfc80d9aSSridhar Samudrala vlan_features = 410cfc80d9aSSridhar Samudrala netdev_increment_features(vlan_features, 411cfc80d9aSSridhar Samudrala standby_dev->vlan_features, 412cfc80d9aSSridhar Samudrala FAILOVER_VLAN_FEATURES); 413cfc80d9aSSridhar Samudrala enc_features = 414cfc80d9aSSridhar Samudrala netdev_increment_features(enc_features, 415cfc80d9aSSridhar Samudrala standby_dev->hw_enc_features, 416cfc80d9aSSridhar Samudrala FAILOVER_ENC_FEATURES); 417cfc80d9aSSridhar Samudrala 418cfc80d9aSSridhar Samudrala dst_release_flag &= standby_dev->priv_flags; 419cfc80d9aSSridhar Samudrala if (standby_dev->hard_header_len > max_hard_header_len) 420cfc80d9aSSridhar Samudrala max_hard_header_len = standby_dev->hard_header_len; 421cfc80d9aSSridhar Samudrala } 422cfc80d9aSSridhar Samudrala 423cfc80d9aSSridhar Samudrala dev->vlan_features = vlan_features; 424cfc80d9aSSridhar Samudrala dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 425cfc80d9aSSridhar Samudrala dev->hard_header_len = max_hard_header_len; 426cfc80d9aSSridhar Samudrala 427cfc80d9aSSridhar Samudrala dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 428cfc80d9aSSridhar Samudrala if (dst_release_flag == (IFF_XMIT_DST_RELEASE | 429cfc80d9aSSridhar Samudrala IFF_XMIT_DST_RELEASE_PERM)) 430cfc80d9aSSridhar Samudrala dev->priv_flags |= IFF_XMIT_DST_RELEASE; 431cfc80d9aSSridhar Samudrala 432cfc80d9aSSridhar Samudrala netdev_change_features(dev); 433cfc80d9aSSridhar Samudrala } 434cfc80d9aSSridhar Samudrala 435cfc80d9aSSridhar Samudrala static void net_failover_lower_state_changed(struct net_device *slave_dev, 436cfc80d9aSSridhar Samudrala struct net_device *primary_dev, 437cfc80d9aSSridhar Samudrala struct net_device *standby_dev) 438cfc80d9aSSridhar Samudrala { 439cfc80d9aSSridhar Samudrala struct netdev_lag_lower_state_info info; 440cfc80d9aSSridhar Samudrala 441cfc80d9aSSridhar Samudrala if (netif_carrier_ok(slave_dev)) 442cfc80d9aSSridhar Samudrala info.link_up = true; 443cfc80d9aSSridhar Samudrala else 444cfc80d9aSSridhar Samudrala info.link_up = false; 445cfc80d9aSSridhar Samudrala 446cfc80d9aSSridhar Samudrala if (slave_dev == primary_dev) { 447cfc80d9aSSridhar Samudrala if (netif_running(primary_dev)) 448cfc80d9aSSridhar Samudrala info.tx_enabled = true; 449cfc80d9aSSridhar Samudrala else 450cfc80d9aSSridhar Samudrala info.tx_enabled = false; 451cfc80d9aSSridhar Samudrala } else { 452cfc80d9aSSridhar Samudrala if ((primary_dev && netif_running(primary_dev)) || 453cfc80d9aSSridhar Samudrala (!netif_running(standby_dev))) 454cfc80d9aSSridhar Samudrala info.tx_enabled = false; 455cfc80d9aSSridhar Samudrala else 456cfc80d9aSSridhar Samudrala info.tx_enabled = true; 457cfc80d9aSSridhar Samudrala } 458cfc80d9aSSridhar Samudrala 459cfc80d9aSSridhar Samudrala netdev_lower_state_changed(slave_dev, &info); 460cfc80d9aSSridhar Samudrala } 461cfc80d9aSSridhar Samudrala 462cfc80d9aSSridhar Samudrala static int net_failover_slave_pre_register(struct net_device *slave_dev, 463cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 464cfc80d9aSSridhar Samudrala { 465cfc80d9aSSridhar Samudrala struct net_device *standby_dev, *primary_dev; 466cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 467cfc80d9aSSridhar Samudrala bool slave_is_standby; 468cfc80d9aSSridhar Samudrala 469cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 470cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 471cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 472cfc80d9aSSridhar Samudrala slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent; 473cfc80d9aSSridhar Samudrala if (slave_is_standby ? standby_dev : primary_dev) { 474cfc80d9aSSridhar Samudrala netdev_err(failover_dev, "%s attempting to register as slave dev when %s already present\n", 475cfc80d9aSSridhar Samudrala slave_dev->name, 476cfc80d9aSSridhar Samudrala slave_is_standby ? "standby" : "primary"); 477cfc80d9aSSridhar Samudrala return -EINVAL; 478cfc80d9aSSridhar Samudrala } 479cfc80d9aSSridhar Samudrala 480cfc80d9aSSridhar Samudrala /* We want to allow only a direct attached VF device as a primary 481cfc80d9aSSridhar Samudrala * netdev. As there is no easy way to check for a VF device, restrict 482cfc80d9aSSridhar Samudrala * this to a pci device. 483cfc80d9aSSridhar Samudrala */ 484cfc80d9aSSridhar Samudrala if (!slave_is_standby && (!slave_dev->dev.parent || 485cfc80d9aSSridhar Samudrala !dev_is_pci(slave_dev->dev.parent))) 486cfc80d9aSSridhar Samudrala return -EINVAL; 487cfc80d9aSSridhar Samudrala 488cfc80d9aSSridhar Samudrala if (failover_dev->features & NETIF_F_VLAN_CHALLENGED && 489cfc80d9aSSridhar Samudrala vlan_uses_dev(failover_dev)) { 490cfc80d9aSSridhar Samudrala netdev_err(failover_dev, "Device %s is VLAN challenged and failover device has VLAN set up\n", 491cfc80d9aSSridhar Samudrala failover_dev->name); 492cfc80d9aSSridhar Samudrala return -EINVAL; 493cfc80d9aSSridhar Samudrala } 494cfc80d9aSSridhar Samudrala 495cfc80d9aSSridhar Samudrala return 0; 496cfc80d9aSSridhar Samudrala } 497cfc80d9aSSridhar Samudrala 498cfc80d9aSSridhar Samudrala static int net_failover_slave_register(struct net_device *slave_dev, 499cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 500cfc80d9aSSridhar Samudrala { 501cfc80d9aSSridhar Samudrala struct net_device *standby_dev, *primary_dev; 502cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 503cfc80d9aSSridhar Samudrala bool slave_is_standby; 504cfc80d9aSSridhar Samudrala u32 orig_mtu; 505cfc80d9aSSridhar Samudrala int err; 506cfc80d9aSSridhar Samudrala 507cfc80d9aSSridhar Samudrala /* Align MTU of slave with failover dev */ 508cfc80d9aSSridhar Samudrala orig_mtu = slave_dev->mtu; 509cfc80d9aSSridhar Samudrala err = dev_set_mtu(slave_dev, failover_dev->mtu); 510cfc80d9aSSridhar Samudrala if (err) { 511cfc80d9aSSridhar Samudrala netdev_err(failover_dev, "unable to change mtu of %s to %u register failed\n", 512cfc80d9aSSridhar Samudrala slave_dev->name, failover_dev->mtu); 513cfc80d9aSSridhar Samudrala goto done; 514cfc80d9aSSridhar Samudrala } 515cfc80d9aSSridhar Samudrala 516cfc80d9aSSridhar Samudrala dev_hold(slave_dev); 517cfc80d9aSSridhar Samudrala 518cfc80d9aSSridhar Samudrala if (netif_running(failover_dev)) { 51900f54e68SPetr Machata err = dev_open(slave_dev, NULL); 520cfc80d9aSSridhar Samudrala if (err && (err != -EBUSY)) { 521cfc80d9aSSridhar Samudrala netdev_err(failover_dev, "Opening slave %s failed err:%d\n", 522cfc80d9aSSridhar Samudrala slave_dev->name, err); 523cfc80d9aSSridhar Samudrala goto err_dev_open; 524cfc80d9aSSridhar Samudrala } 525cfc80d9aSSridhar Samudrala } 526cfc80d9aSSridhar Samudrala 527cfc80d9aSSridhar Samudrala netif_addr_lock_bh(failover_dev); 528cfc80d9aSSridhar Samudrala dev_uc_sync_multiple(slave_dev, failover_dev); 529e5223438SLiran Alon dev_mc_sync_multiple(slave_dev, failover_dev); 530cfc80d9aSSridhar Samudrala netif_addr_unlock_bh(failover_dev); 531cfc80d9aSSridhar Samudrala 532cfc80d9aSSridhar Samudrala err = vlan_vids_add_by_dev(slave_dev, failover_dev); 533cfc80d9aSSridhar Samudrala if (err) { 534cfc80d9aSSridhar Samudrala netdev_err(failover_dev, "Failed to add vlan ids to device %s err:%d\n", 535cfc80d9aSSridhar Samudrala slave_dev->name, err); 536cfc80d9aSSridhar Samudrala goto err_vlan_add; 537cfc80d9aSSridhar Samudrala } 538cfc80d9aSSridhar Samudrala 539cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 540cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 541cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 542cfc80d9aSSridhar Samudrala slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent; 543cfc80d9aSSridhar Samudrala 544cfc80d9aSSridhar Samudrala if (slave_is_standby) { 545cfc80d9aSSridhar Samudrala rcu_assign_pointer(nfo_info->standby_dev, slave_dev); 546cfc80d9aSSridhar Samudrala standby_dev = slave_dev; 547cfc80d9aSSridhar Samudrala dev_get_stats(standby_dev, &nfo_info->standby_stats); 548cfc80d9aSSridhar Samudrala } else { 549cfc80d9aSSridhar Samudrala rcu_assign_pointer(nfo_info->primary_dev, slave_dev); 550cfc80d9aSSridhar Samudrala primary_dev = slave_dev; 551cfc80d9aSSridhar Samudrala dev_get_stats(primary_dev, &nfo_info->primary_stats); 552cfc80d9aSSridhar Samudrala failover_dev->min_mtu = slave_dev->min_mtu; 553cfc80d9aSSridhar Samudrala failover_dev->max_mtu = slave_dev->max_mtu; 554cfc80d9aSSridhar Samudrala } 555cfc80d9aSSridhar Samudrala 556cfc80d9aSSridhar Samudrala net_failover_lower_state_changed(slave_dev, primary_dev, standby_dev); 557cfc80d9aSSridhar Samudrala net_failover_compute_features(failover_dev); 558cfc80d9aSSridhar Samudrala 559cfc80d9aSSridhar Samudrala call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 560cfc80d9aSSridhar Samudrala 561cfc80d9aSSridhar Samudrala netdev_info(failover_dev, "failover %s slave:%s registered\n", 562cfc80d9aSSridhar Samudrala slave_is_standby ? "standby" : "primary", slave_dev->name); 563cfc80d9aSSridhar Samudrala 564cfc80d9aSSridhar Samudrala return 0; 565cfc80d9aSSridhar Samudrala 566cfc80d9aSSridhar Samudrala err_vlan_add: 567cfc80d9aSSridhar Samudrala dev_uc_unsync(slave_dev, failover_dev); 568cfc80d9aSSridhar Samudrala dev_mc_unsync(slave_dev, failover_dev); 569cfc80d9aSSridhar Samudrala dev_close(slave_dev); 570cfc80d9aSSridhar Samudrala err_dev_open: 571cfc80d9aSSridhar Samudrala dev_put(slave_dev); 572cfc80d9aSSridhar Samudrala dev_set_mtu(slave_dev, orig_mtu); 573cfc80d9aSSridhar Samudrala done: 574cfc80d9aSSridhar Samudrala return err; 575cfc80d9aSSridhar Samudrala } 576cfc80d9aSSridhar Samudrala 577cfc80d9aSSridhar Samudrala static int net_failover_slave_pre_unregister(struct net_device *slave_dev, 578cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 579cfc80d9aSSridhar Samudrala { 580cfc80d9aSSridhar Samudrala struct net_device *standby_dev, *primary_dev; 581cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 582cfc80d9aSSridhar Samudrala 583cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 584cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 585cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 586cfc80d9aSSridhar Samudrala 587cfc80d9aSSridhar Samudrala if (slave_dev != primary_dev && slave_dev != standby_dev) 588cfc80d9aSSridhar Samudrala return -ENODEV; 589cfc80d9aSSridhar Samudrala 590cfc80d9aSSridhar Samudrala return 0; 591cfc80d9aSSridhar Samudrala } 592cfc80d9aSSridhar Samudrala 593cfc80d9aSSridhar Samudrala static int net_failover_slave_unregister(struct net_device *slave_dev, 594cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 595cfc80d9aSSridhar Samudrala { 596cfc80d9aSSridhar Samudrala struct net_device *standby_dev, *primary_dev; 597cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 598cfc80d9aSSridhar Samudrala bool slave_is_standby; 599cfc80d9aSSridhar Samudrala 600cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 601cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 602cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 603cfc80d9aSSridhar Samudrala 6049e7e6cabSYueHaibing if (WARN_ON_ONCE(slave_dev != primary_dev && slave_dev != standby_dev)) 6059e7e6cabSYueHaibing return -ENODEV; 6069e7e6cabSYueHaibing 607cfc80d9aSSridhar Samudrala vlan_vids_del_by_dev(slave_dev, failover_dev); 608cfc80d9aSSridhar Samudrala dev_uc_unsync(slave_dev, failover_dev); 609cfc80d9aSSridhar Samudrala dev_mc_unsync(slave_dev, failover_dev); 610cfc80d9aSSridhar Samudrala dev_close(slave_dev); 611cfc80d9aSSridhar Samudrala 612cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 613cfc80d9aSSridhar Samudrala dev_get_stats(failover_dev, &nfo_info->failover_stats); 614cfc80d9aSSridhar Samudrala 615cfc80d9aSSridhar Samudrala slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent; 616cfc80d9aSSridhar Samudrala if (slave_is_standby) { 617cfc80d9aSSridhar Samudrala RCU_INIT_POINTER(nfo_info->standby_dev, NULL); 618cfc80d9aSSridhar Samudrala } else { 619cfc80d9aSSridhar Samudrala RCU_INIT_POINTER(nfo_info->primary_dev, NULL); 620cfc80d9aSSridhar Samudrala if (standby_dev) { 621cfc80d9aSSridhar Samudrala failover_dev->min_mtu = standby_dev->min_mtu; 622cfc80d9aSSridhar Samudrala failover_dev->max_mtu = standby_dev->max_mtu; 623cfc80d9aSSridhar Samudrala } 624cfc80d9aSSridhar Samudrala } 625cfc80d9aSSridhar Samudrala 626cfc80d9aSSridhar Samudrala dev_put(slave_dev); 627cfc80d9aSSridhar Samudrala 628cfc80d9aSSridhar Samudrala net_failover_compute_features(failover_dev); 629cfc80d9aSSridhar Samudrala 630cfc80d9aSSridhar Samudrala netdev_info(failover_dev, "failover %s slave:%s unregistered\n", 631cfc80d9aSSridhar Samudrala slave_is_standby ? "standby" : "primary", slave_dev->name); 632cfc80d9aSSridhar Samudrala 633cfc80d9aSSridhar Samudrala return 0; 634cfc80d9aSSridhar Samudrala } 635cfc80d9aSSridhar Samudrala 636cfc80d9aSSridhar Samudrala static int net_failover_slave_link_change(struct net_device *slave_dev, 637cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 638cfc80d9aSSridhar Samudrala { 639cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 640cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 641cfc80d9aSSridhar Samudrala 642cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 643cfc80d9aSSridhar Samudrala 644cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 645cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 646cfc80d9aSSridhar Samudrala 647cfc80d9aSSridhar Samudrala if (slave_dev != primary_dev && slave_dev != standby_dev) 648cfc80d9aSSridhar Samudrala return -ENODEV; 649cfc80d9aSSridhar Samudrala 650cfc80d9aSSridhar Samudrala if ((primary_dev && net_failover_xmit_ready(primary_dev)) || 651cfc80d9aSSridhar Samudrala (standby_dev && net_failover_xmit_ready(standby_dev))) { 652cfc80d9aSSridhar Samudrala netif_carrier_on(failover_dev); 653cfc80d9aSSridhar Samudrala netif_tx_wake_all_queues(failover_dev); 654cfc80d9aSSridhar Samudrala } else { 655cfc80d9aSSridhar Samudrala dev_get_stats(failover_dev, &nfo_info->failover_stats); 656cfc80d9aSSridhar Samudrala netif_carrier_off(failover_dev); 657cfc80d9aSSridhar Samudrala netif_tx_stop_all_queues(failover_dev); 658cfc80d9aSSridhar Samudrala } 659cfc80d9aSSridhar Samudrala 660cfc80d9aSSridhar Samudrala net_failover_lower_state_changed(slave_dev, primary_dev, standby_dev); 661cfc80d9aSSridhar Samudrala 662cfc80d9aSSridhar Samudrala return 0; 663cfc80d9aSSridhar Samudrala } 664cfc80d9aSSridhar Samudrala 665cfc80d9aSSridhar Samudrala static int net_failover_slave_name_change(struct net_device *slave_dev, 666cfc80d9aSSridhar Samudrala struct net_device *failover_dev) 667cfc80d9aSSridhar Samudrala { 668cfc80d9aSSridhar Samudrala struct net_device *primary_dev, *standby_dev; 669cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 670cfc80d9aSSridhar Samudrala 671cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 672cfc80d9aSSridhar Samudrala 673cfc80d9aSSridhar Samudrala primary_dev = rtnl_dereference(nfo_info->primary_dev); 674cfc80d9aSSridhar Samudrala standby_dev = rtnl_dereference(nfo_info->standby_dev); 675cfc80d9aSSridhar Samudrala 676cfc80d9aSSridhar Samudrala if (slave_dev != primary_dev && slave_dev != standby_dev) 677cfc80d9aSSridhar Samudrala return -ENODEV; 678cfc80d9aSSridhar Samudrala 679cfc80d9aSSridhar Samudrala /* We need to bring up the slave after the rename by udev in case 680cfc80d9aSSridhar Samudrala * open failed with EBUSY when it was registered. 681cfc80d9aSSridhar Samudrala */ 68200f54e68SPetr Machata dev_open(slave_dev, NULL); 683cfc80d9aSSridhar Samudrala 684cfc80d9aSSridhar Samudrala return 0; 685cfc80d9aSSridhar Samudrala } 686cfc80d9aSSridhar Samudrala 687cfc80d9aSSridhar Samudrala static struct failover_ops net_failover_ops = { 688cfc80d9aSSridhar Samudrala .slave_pre_register = net_failover_slave_pre_register, 689cfc80d9aSSridhar Samudrala .slave_register = net_failover_slave_register, 690cfc80d9aSSridhar Samudrala .slave_pre_unregister = net_failover_slave_pre_unregister, 691cfc80d9aSSridhar Samudrala .slave_unregister = net_failover_slave_unregister, 692cfc80d9aSSridhar Samudrala .slave_link_change = net_failover_slave_link_change, 693cfc80d9aSSridhar Samudrala .slave_name_change = net_failover_slave_name_change, 694cfc80d9aSSridhar Samudrala .slave_handle_frame = net_failover_handle_frame, 695cfc80d9aSSridhar Samudrala }; 696cfc80d9aSSridhar Samudrala 697cfc80d9aSSridhar Samudrala /** 698cfc80d9aSSridhar Samudrala * net_failover_create - Create and register a failover instance 699cfc80d9aSSridhar Samudrala * 700c1c0f6eaSLee Jones * @standby_dev: standby netdev 701cfc80d9aSSridhar Samudrala * 702cfc80d9aSSridhar Samudrala * Creates a failover netdev and registers a failover instance for a standby 703cfc80d9aSSridhar Samudrala * netdev. Used by paravirtual drivers that use 3-netdev model. 704cfc80d9aSSridhar Samudrala * The failover netdev acts as a master device and controls 2 slave devices - 705cfc80d9aSSridhar Samudrala * the original standby netdev and a VF netdev with the same MAC gets 706cfc80d9aSSridhar Samudrala * registered as primary netdev. 707cfc80d9aSSridhar Samudrala * 708cfc80d9aSSridhar Samudrala * Return: pointer to failover instance 709cfc80d9aSSridhar Samudrala */ 710cfc80d9aSSridhar Samudrala struct failover *net_failover_create(struct net_device *standby_dev) 711cfc80d9aSSridhar Samudrala { 712cfc80d9aSSridhar Samudrala struct device *dev = standby_dev->dev.parent; 713cfc80d9aSSridhar Samudrala struct net_device *failover_dev; 714cfc80d9aSSridhar Samudrala struct failover *failover; 715cfc80d9aSSridhar Samudrala int err; 716cfc80d9aSSridhar Samudrala 717cfc80d9aSSridhar Samudrala /* Alloc at least 2 queues, for now we are going with 16 assuming 718cfc80d9aSSridhar Samudrala * that VF devices being enslaved won't have too many queues. 719cfc80d9aSSridhar Samudrala */ 720cfc80d9aSSridhar Samudrala failover_dev = alloc_etherdev_mq(sizeof(struct net_failover_info), 16); 721cfc80d9aSSridhar Samudrala if (!failover_dev) { 722cfc80d9aSSridhar Samudrala dev_err(dev, "Unable to allocate failover_netdev!\n"); 723cfc80d9aSSridhar Samudrala return ERR_PTR(-ENOMEM); 724cfc80d9aSSridhar Samudrala } 725cfc80d9aSSridhar Samudrala 726cfc80d9aSSridhar Samudrala dev_net_set(failover_dev, dev_net(standby_dev)); 727cfc80d9aSSridhar Samudrala SET_NETDEV_DEV(failover_dev, dev); 728cfc80d9aSSridhar Samudrala 729cfc80d9aSSridhar Samudrala failover_dev->netdev_ops = &failover_dev_ops; 730cfc80d9aSSridhar Samudrala failover_dev->ethtool_ops = &failover_ethtool_ops; 731cfc80d9aSSridhar Samudrala 732cfc80d9aSSridhar Samudrala /* Initialize the device options */ 733cfc80d9aSSridhar Samudrala failover_dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 734cfc80d9aSSridhar Samudrala failover_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | 735cfc80d9aSSridhar Samudrala IFF_TX_SKB_SHARING); 736cfc80d9aSSridhar Samudrala 737cfc80d9aSSridhar Samudrala /* don't acquire failover netdev's netif_tx_lock when transmitting */ 738cfc80d9aSSridhar Samudrala failover_dev->features |= NETIF_F_LLTX; 739cfc80d9aSSridhar Samudrala 740cfc80d9aSSridhar Samudrala /* Don't allow failover devices to change network namespaces. */ 741cfc80d9aSSridhar Samudrala failover_dev->features |= NETIF_F_NETNS_LOCAL; 742cfc80d9aSSridhar Samudrala 743cfc80d9aSSridhar Samudrala failover_dev->hw_features = FAILOVER_VLAN_FEATURES | 744cfc80d9aSSridhar Samudrala NETIF_F_HW_VLAN_CTAG_TX | 745cfc80d9aSSridhar Samudrala NETIF_F_HW_VLAN_CTAG_RX | 746cfc80d9aSSridhar Samudrala NETIF_F_HW_VLAN_CTAG_FILTER; 747cfc80d9aSSridhar Samudrala 748cfc80d9aSSridhar Samudrala failover_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 749cfc80d9aSSridhar Samudrala failover_dev->features |= failover_dev->hw_features; 750cfc80d9aSSridhar Samudrala 751ea52a0b5SJakub Kicinski dev_addr_set(failover_dev, standby_dev->dev_addr); 752cfc80d9aSSridhar Samudrala 753cfc80d9aSSridhar Samudrala failover_dev->min_mtu = standby_dev->min_mtu; 754cfc80d9aSSridhar Samudrala failover_dev->max_mtu = standby_dev->max_mtu; 755cfc80d9aSSridhar Samudrala 756cfc80d9aSSridhar Samudrala err = register_netdev(failover_dev); 757cfc80d9aSSridhar Samudrala if (err) { 758cfc80d9aSSridhar Samudrala dev_err(dev, "Unable to register failover_dev!\n"); 759cfc80d9aSSridhar Samudrala goto err_register_netdev; 760cfc80d9aSSridhar Samudrala } 761cfc80d9aSSridhar Samudrala 762cfc80d9aSSridhar Samudrala netif_carrier_off(failover_dev); 763cfc80d9aSSridhar Samudrala 764cfc80d9aSSridhar Samudrala failover = failover_register(failover_dev, &net_failover_ops); 76509317da3SYueHaibing if (IS_ERR(failover)) { 76609317da3SYueHaibing err = PTR_ERR(failover); 767cfc80d9aSSridhar Samudrala goto err_failover_register; 76809317da3SYueHaibing } 769cfc80d9aSSridhar Samudrala 770cfc80d9aSSridhar Samudrala return failover; 771cfc80d9aSSridhar Samudrala 772cfc80d9aSSridhar Samudrala err_failover_register: 773cfc80d9aSSridhar Samudrala unregister_netdev(failover_dev); 774cfc80d9aSSridhar Samudrala err_register_netdev: 775cfc80d9aSSridhar Samudrala free_netdev(failover_dev); 776cfc80d9aSSridhar Samudrala 777cfc80d9aSSridhar Samudrala return ERR_PTR(err); 778cfc80d9aSSridhar Samudrala } 779cfc80d9aSSridhar Samudrala EXPORT_SYMBOL_GPL(net_failover_create); 780cfc80d9aSSridhar Samudrala 781cfc80d9aSSridhar Samudrala /** 782cfc80d9aSSridhar Samudrala * net_failover_destroy - Destroy a failover instance 783cfc80d9aSSridhar Samudrala * 784cfc80d9aSSridhar Samudrala * @failover: pointer to failover instance 785cfc80d9aSSridhar Samudrala * 786cfc80d9aSSridhar Samudrala * Unregisters any slave netdevs associated with the failover instance by 787cfc80d9aSSridhar Samudrala * calling failover_slave_unregister(). 788cfc80d9aSSridhar Samudrala * unregisters the failover instance itself and finally frees the failover 789cfc80d9aSSridhar Samudrala * netdev. Used by paravirtual drivers that use 3-netdev model. 790cfc80d9aSSridhar Samudrala * 791cfc80d9aSSridhar Samudrala */ 792cfc80d9aSSridhar Samudrala void net_failover_destroy(struct failover *failover) 793cfc80d9aSSridhar Samudrala { 794cfc80d9aSSridhar Samudrala struct net_failover_info *nfo_info; 795cfc80d9aSSridhar Samudrala struct net_device *failover_dev; 796cfc80d9aSSridhar Samudrala struct net_device *slave_dev; 797cfc80d9aSSridhar Samudrala 798cfc80d9aSSridhar Samudrala if (!failover) 799cfc80d9aSSridhar Samudrala return; 800cfc80d9aSSridhar Samudrala 801cfc80d9aSSridhar Samudrala failover_dev = rcu_dereference(failover->failover_dev); 802cfc80d9aSSridhar Samudrala nfo_info = netdev_priv(failover_dev); 803cfc80d9aSSridhar Samudrala 804cfc80d9aSSridhar Samudrala netif_device_detach(failover_dev); 805cfc80d9aSSridhar Samudrala 806cfc80d9aSSridhar Samudrala rtnl_lock(); 807cfc80d9aSSridhar Samudrala 808cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->primary_dev); 809cfc80d9aSSridhar Samudrala if (slave_dev) 810cfc80d9aSSridhar Samudrala failover_slave_unregister(slave_dev); 811cfc80d9aSSridhar Samudrala 812cfc80d9aSSridhar Samudrala slave_dev = rtnl_dereference(nfo_info->standby_dev); 813cfc80d9aSSridhar Samudrala if (slave_dev) 814cfc80d9aSSridhar Samudrala failover_slave_unregister(slave_dev); 815cfc80d9aSSridhar Samudrala 816cfc80d9aSSridhar Samudrala failover_unregister(failover); 817cfc80d9aSSridhar Samudrala 818cfc80d9aSSridhar Samudrala unregister_netdevice(failover_dev); 819cfc80d9aSSridhar Samudrala 820cfc80d9aSSridhar Samudrala rtnl_unlock(); 821cfc80d9aSSridhar Samudrala 822cfc80d9aSSridhar Samudrala free_netdev(failover_dev); 823cfc80d9aSSridhar Samudrala } 824cfc80d9aSSridhar Samudrala EXPORT_SYMBOL_GPL(net_failover_destroy); 825cfc80d9aSSridhar Samudrala 826cfc80d9aSSridhar Samudrala static __init int 827cfc80d9aSSridhar Samudrala net_failover_init(void) 828cfc80d9aSSridhar Samudrala { 829cfc80d9aSSridhar Samudrala return 0; 830cfc80d9aSSridhar Samudrala } 831cfc80d9aSSridhar Samudrala module_init(net_failover_init); 832cfc80d9aSSridhar Samudrala 833cfc80d9aSSridhar Samudrala static __exit 834cfc80d9aSSridhar Samudrala void net_failover_exit(void) 835cfc80d9aSSridhar Samudrala { 836cfc80d9aSSridhar Samudrala } 837cfc80d9aSSridhar Samudrala module_exit(net_failover_exit); 838cfc80d9aSSridhar Samudrala 839cfc80d9aSSridhar Samudrala MODULE_DESCRIPTION("Failover driver for Paravirtual drivers"); 840cfc80d9aSSridhar Samudrala MODULE_LICENSE("GPL v2"); 841