team: add peer notification

When port is enabled or disabled, allow to notify peers by unsolicitated
NAs or gratuitous ARPs. Disabled by default.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 94 insertions, 1 deletions

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index bff7e0b0b4e7..0433ee994f8c 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -622,6 +622,46 @@ static int team_change_mode(struct team *team, const char *kind)
 }
 
 
+/*********************
+ * Peers notification
+ *********************/
+
+static void team_notify_peers_work(struct work_struct *work)
+{
+        struct team *team;
+
+        team = container_of(work, struct team, notify_peers.dw.work);
+
+        if (!rtnl_trylock()) {
+                schedule_delayed_work(&team->notify_peers.dw, 0);
+                return;
+        }
+        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, team->dev);
+        rtnl_unlock();
+        if (!atomic_dec_and_test(&team->notify_peers.count_pending))
+                schedule_delayed_work(&team->notify_peers.dw,
+                                      msecs_to_jiffies(team->notify_peers.interval));
+}
+
+static void team_notify_peers(struct team *team)
+{
+        if (!team->notify_peers.count || !netif_running(team->dev))
+                return;
+        atomic_set(&team->notify_peers.count_pending, team->notify_peers.count);
+        schedule_delayed_work(&team->notify_peers.dw, 0);
+}
+
+static void team_notify_peers_init(struct team *team)
+{
+        INIT_DELAYED_WORK(&team->notify_peers.dw, team_notify_peers_work);
+}
+
+static void team_notify_peers_fini(struct team *team)
+{
+        cancel_delayed_work_sync(&team->notify_peers.dw);
+}
+
+
 /************************
  * Rx path frame handler
  ************************/
@@ -846,6 +886,7 @@ static void team_port_enable(struct team *team,
         team_queue_override_port_add(team, port);
         if (team->ops.port_enabled)
                 team->ops.port_enabled(team, port);
+        team_notify_peers(team);
 }
 
 static void __reconstruct_port_hlist(struct team *team, int rm_index)
@@ -875,6 +916,7 @@ static void team_port_disable(struct team *team,
         team->en_port_count--;
         team_queue_override_port_del(team, port);
         team_adjust_ops(team);
+        team_notify_peers(team);
 }
 
 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
@@ -1205,6 +1247,34 @@ static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
         return team_change_mode(team, ctx->data.str_val);
 }
 
+static int team_notify_peers_count_get(struct team *team,
+                                       struct team_gsetter_ctx *ctx)
+{
+        ctx->data.u32_val = team->notify_peers.count;
+        return 0;
+}
+
+static int team_notify_peers_count_set(struct team *team,
+                                       struct team_gsetter_ctx *ctx)
+{
+        team->notify_peers.count = ctx->data.u32_val;
+        return 0;
+}
+
+static int team_notify_peers_interval_get(struct team *team,
+                                          struct team_gsetter_ctx *ctx)
+{
+        ctx->data.u32_val = team->notify_peers.interval;
+        return 0;
+}
+
+static int team_notify_peers_interval_set(struct team *team,
+                                          struct team_gsetter_ctx *ctx)
+{
+        team->notify_peers.interval = ctx->data.u32_val;
+        return 0;
+}
+
 static int team_port_en_option_get(struct team *team,
                                    struct team_gsetter_ctx *ctx)
 {
@@ -1317,6 +1387,18 @@ static const struct team_option team_options[] = {
                 .setter = team_mode_option_set,
         },
         {
+                .name = "notify_peers_count",
+                .type = TEAM_OPTION_TYPE_U32,
+                .getter = team_notify_peers_count_get,
+                .setter = team_notify_peers_count_set,
+        },
+        {
+                .name = "notify_peers_interval",
+                .type = TEAM_OPTION_TYPE_U32,
+                .getter = team_notify_peers_interval_get,
+                .setter = team_notify_peers_interval_set,
+        },
+        {
                 .name = "enabled",
                 .type = TEAM_OPTION_TYPE_BOOL,
                 .per_port = true,
@@ -1396,6 +1478,9 @@ static int team_init(struct net_device *dev)
 
         INIT_LIST_HEAD(&team->option_list);
         INIT_LIST_HEAD(&team->option_inst_list);
+
+        team_notify_peers_init(team);
+
         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
         if (err)
                 goto err_options_register;
@@ -1406,6 +1491,7 @@ static int team_init(struct net_device *dev)
         return 0;
 
 err_options_register:
+        team_notify_peers_fini(team);
         team_queue_override_fini(team);
 err_team_queue_override_init:
         free_percpu(team->pcpu_stats);
@@ -1425,6 +1511,7 @@ static void team_uninit(struct net_device *dev)
 
         __team_change_mode(team, NULL); /* cleanup */
         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
+        team_notify_peers_fini(team);
         team_queue_override_fini(team);
         mutex_unlock(&team->lock);
 }
diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index f6156f91eb1c..b0b83683461e 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -10,9 +10,9 @@
 #ifndef _LINUX_IF_TEAM_H_
 #define _LINUX_IF_TEAM_H_
 
-
 #include <linux/netpoll.h>
 #include <net/sch_generic.h>
+#include <linux/types.h>
 #include <uapi/linux/if_team.h>
 
 struct team_pcpu_stats {
@@ -194,6 +194,12 @@ struct team {
         bool user_carrier_enabled;
         bool queue_override_enabled;
         struct list_head *qom_lists; /* array of queue override mapping lists */
+        struct {
+                unsigned int count;
+                unsigned int interval; /* in ms */
+                atomic_t count_pending;
+                struct delayed_work dw;
+        } notify_peers;
         long mode_priv[TEAM_MODE_PRIV_LONGS];
 };