1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2018-2021, Intel Corporation. */
4 /* Link Aggregation code */
10 * ice_lag_nop_handler - no-op Rx handler to disable LAG
11 * @pskb: pointer to skb pointer
13 rx_handler_result_t ice_lag_nop_handler(struct sk_buff __always_unused **pskb)
15 return RX_HANDLER_PASS;
19 * ice_lag_set_primary - set PF LAG state as Primary
20 * @lag: LAG info struct
22 static void ice_lag_set_primary(struct ice_lag *lag)
24 struct ice_pf *pf = lag->pf;
29 if (lag->role != ICE_LAG_UNSET && lag->role != ICE_LAG_BACKUP) {
30 dev_warn(ice_pf_to_dev(pf), "%s: Attempt to be Primary, but incompatible state.\n",
31 netdev_name(lag->netdev));
35 lag->role = ICE_LAG_PRIMARY;
39 * ice_lag_set_backup - set PF LAG state to Backup
40 * @lag: LAG info struct
42 static void ice_lag_set_backup(struct ice_lag *lag)
44 struct ice_pf *pf = lag->pf;
49 if (lag->role != ICE_LAG_UNSET && lag->role != ICE_LAG_PRIMARY) {
50 dev_dbg(ice_pf_to_dev(pf), "%s: Attempt to be Backup, but incompatible state\n",
51 netdev_name(lag->netdev));
55 lag->role = ICE_LAG_BACKUP;
59 * ice_display_lag_info - print LAG info
60 * @lag: LAG info struct
62 static void ice_display_lag_info(struct ice_lag *lag)
64 const char *name, *peer, *upper, *role, *bonded, *master;
65 struct device *dev = &lag->pf->pdev->dev;
67 name = lag->netdev ? netdev_name(lag->netdev) : "unset";
68 peer = lag->peer_netdev ? netdev_name(lag->peer_netdev) : "unset";
69 upper = lag->upper_netdev ? netdev_name(lag->upper_netdev) : "unset";
70 master = lag->master ? "TRUE" : "FALSE";
71 bonded = lag->bonded ? "BONDED" : "UNBONDED";
90 dev_dbg(dev, "%s %s, peer:%s, upper:%s, role:%s, master:%s\n", name,
91 bonded, peer, upper, role, master);
95 * ice_lag_info_event - handle NETDEV_BONDING_INFO event
96 * @lag: LAG info struct
97 * @ptr: opaque data pointer
99 * ptr is to be cast to (netdev_notifier_bonding_info *)
101 static void ice_lag_info_event(struct ice_lag *lag, void *ptr)
103 struct netdev_notifier_bonding_info *info;
104 struct netdev_bonding_info *bonding_info;
105 struct net_device *event_netdev;
106 const char *lag_netdev_name;
108 event_netdev = netdev_notifier_info_to_dev(ptr);
110 lag_netdev_name = netdev_name(lag->netdev);
111 bonding_info = &info->bonding_info;
113 if (event_netdev != lag->netdev || !lag->bonded || !lag->upper_netdev)
116 if (bonding_info->master.bond_mode != BOND_MODE_ACTIVEBACKUP) {
117 netdev_dbg(lag->netdev, "Bonding event recv, but mode not active/backup\n");
121 if (strcmp(bonding_info->slave.slave_name, lag_netdev_name)) {
122 netdev_dbg(lag->netdev, "Bonding event recv, but slave info not for us\n");
126 if (bonding_info->slave.state)
127 ice_lag_set_backup(lag);
129 ice_lag_set_primary(lag);
132 ice_display_lag_info(lag);
136 * ice_lag_link - handle LAG link event
137 * @lag: LAG info struct
138 * @info: info from the netdev notifier
141 ice_lag_link(struct ice_lag *lag, struct netdev_notifier_changeupper_info *info)
143 struct net_device *netdev_tmp, *upper = info->upper_dev;
144 struct ice_pf *pf = lag->pf;
148 dev_warn(ice_pf_to_dev(pf), "%s Already part of a bond\n",
149 netdev_name(lag->netdev));
152 for_each_netdev_in_bond_rcu(upper, netdev_tmp)
156 if (lag->upper_netdev != upper) {
158 lag->upper_netdev = upper;
161 ice_clear_sriov_cap(pf);
162 ice_clear_rdma_cap(pf);
165 lag->role = ICE_LAG_UNSET;
167 /* if this is the first element in an LAG mark as master */
168 lag->master = !!(peers == 1);
172 * ice_lag_unlink - handle unlink event
173 * @lag: LAG info struct
174 * @info: info from netdev notification
177 ice_lag_unlink(struct ice_lag *lag,
178 struct netdev_notifier_changeupper_info *info)
180 struct net_device *netdev_tmp, *upper = info->upper_dev;
181 struct ice_pf *pf = lag->pf;
185 netdev_dbg(lag->netdev, "bonding unlink event on non-LAG netdev\n");
189 /* determine if we are in the new LAG config or not */
191 for_each_netdev_in_bond_rcu(upper, netdev_tmp) {
192 if (netdev_tmp == lag->netdev) {
202 if (lag->upper_netdev) {
203 dev_put(lag->upper_netdev);
204 lag->upper_netdev = NULL;
207 if (lag->peer_netdev) {
208 dev_put(lag->peer_netdev);
209 lag->peer_netdev = NULL;
212 ice_set_sriov_cap(pf);
213 ice_set_rdma_cap(pf);
215 lag->role = ICE_LAG_NONE;
219 * ice_lag_changeupper_event - handle LAG changeupper event
220 * @lag: LAG info struct
221 * @ptr: opaque pointer data
223 * ptr is to be cast into netdev_notifier_changeupper_info
225 static void ice_lag_changeupper_event(struct ice_lag *lag, void *ptr)
227 struct netdev_notifier_changeupper_info *info;
228 struct net_device *netdev;
231 netdev = netdev_notifier_info_to_dev(ptr);
233 /* not for this netdev */
234 if (netdev != lag->netdev)
237 if (!info->upper_dev) {
238 netdev_dbg(netdev, "changeupper rcvd, but no upper defined\n");
242 netdev_dbg(netdev, "bonding %s\n", info->linking ? "LINK" : "UNLINK");
244 if (!netif_is_lag_master(info->upper_dev)) {
245 netdev_dbg(netdev, "changeupper rcvd, but not master. bail\n");
250 ice_lag_link(lag, info);
252 ice_lag_unlink(lag, info);
254 ice_display_lag_info(lag);
258 * ice_lag_changelower_event - handle LAG changelower event
259 * @lag: LAG info struct
260 * @ptr: opaque data pointer
262 * ptr to be cast to netdev_notifier_changelowerstate_info
264 static void ice_lag_changelower_event(struct ice_lag *lag, void *ptr)
266 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
268 if (netdev != lag->netdev)
271 netdev_dbg(netdev, "bonding info\n");
273 if (!netif_is_lag_port(netdev))
274 netdev_dbg(netdev, "CHANGELOWER rcvd, but netdev not in LAG. Bail\n");
278 * ice_lag_event_handler - handle LAG events from netdev
279 * @notif_blk: notifier block registered by this netdev
281 * @ptr: opaque data containing notifier event
284 ice_lag_event_handler(struct notifier_block *notif_blk, unsigned long event,
287 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
290 lag = container_of(notif_blk, struct ice_lag, notif_block);
295 /* Check that the netdev is in the working namespace */
296 if (!net_eq(dev_net(netdev), &init_net))
300 case NETDEV_CHANGEUPPER:
301 ice_lag_changeupper_event(lag, ptr);
303 case NETDEV_CHANGELOWERSTATE:
304 ice_lag_changelower_event(lag, ptr);
306 case NETDEV_BONDING_INFO:
307 ice_lag_info_event(lag, ptr);
309 case NETDEV_UNREGISTER:
310 ice_lag_unlink(lag, ptr);
320 * ice_register_lag_handler - register LAG handler on netdev
323 static int ice_register_lag_handler(struct ice_lag *lag)
325 struct device *dev = ice_pf_to_dev(lag->pf);
326 struct notifier_block *notif_blk;
328 notif_blk = &lag->notif_block;
330 if (!notif_blk->notifier_call) {
331 notif_blk->notifier_call = ice_lag_event_handler;
332 if (register_netdevice_notifier(notif_blk)) {
333 notif_blk->notifier_call = NULL;
334 dev_err(dev, "FAIL register LAG event handler!\n");
337 dev_dbg(dev, "LAG event handler registered\n");
343 * ice_unregister_lag_handler - unregister LAG handler on netdev
346 static void ice_unregister_lag_handler(struct ice_lag *lag)
348 struct device *dev = ice_pf_to_dev(lag->pf);
349 struct notifier_block *notif_blk;
351 notif_blk = &lag->notif_block;
352 if (notif_blk->notifier_call) {
353 unregister_netdevice_notifier(notif_blk);
354 dev_dbg(dev, "LAG event handler unregistered\n");
359 * ice_init_lag - initialize support for LAG
362 * Alloc memory for LAG structs and initialize the elements.
363 * Memory will be freed in ice_deinit_lag
365 int ice_init_lag(struct ice_pf *pf)
367 struct device *dev = ice_pf_to_dev(pf);
372 pf->lag = kzalloc(sizeof(*lag), GFP_KERNEL);
377 vsi = ice_get_main_vsi(pf);
379 dev_err(dev, "couldn't get main vsi, link aggregation init fail\n");
385 lag->netdev = vsi->netdev;
386 lag->role = ICE_LAG_NONE;
388 lag->peer_netdev = NULL;
389 lag->upper_netdev = NULL;
390 lag->notif_block.notifier_call = NULL;
392 err = ice_register_lag_handler(lag);
394 dev_warn(dev, "INIT LAG: Failed to register event handler\n");
398 ice_display_lag_info(lag);
400 dev_dbg(dev, "INIT LAG complete\n");
410 * ice_deinit_lag - Clean up LAG
413 * Clean up kernel LAG info and free memory
414 * This function is meant to only be called on driver remove/shutdown
416 void ice_deinit_lag(struct ice_pf *pf)
426 ice_unregister_lag_handler(lag);
428 if (lag->upper_netdev)
429 dev_put(lag->upper_netdev);
431 if (lag->peer_netdev)
432 dev_put(lag->peer_netdev);