diff options
| author | Nikolay Aleksandrov <nikolay@nvidia.com> | 2021-08-13 17:59:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-08-14 16:02:43 +0300 |
| commit | bb18ef8e7e180d8590df2808ec4014af114756cb (patch) | |
| tree | 8c37a3ae08cb262aff32315e609bb787dc1ad23a /net/bridge | |
| parent | 2fa16787c47437318fc6ceeeddc34ceabd9313c7 (diff) | |
| download | linux-bb18ef8e7e180d8590df2808ec4014af114756cb.tar.xz | |
net: bridge: mcast: record querier port device ifindex instead of pointer
Currently when a querier port is detected its net_bridge_port pointer is
recorded, but it's used only for comparisons so it's fine to have stale
pointer, in order to dereference and use the port pointer a proper
accounting of its usage must be implemented adding unnecessary
complexity. To solve the problem we can just store the netdevice ifindex
instead of the port pointer and retrieve the bridge port. It is a best
effort and the device needs to be validated that is still part of that
bridge before use, but that is small price to pay for avoiding querier
reference counting for each port/vlan.
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/br_multicast.c | 19 | ||||
| -rw-r--r-- | net/bridge/br_private.h | 2 |
2 files changed, 13 insertions, 8 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index df6bf6a237aa..853b947edf87 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -2850,7 +2850,8 @@ update: brmctx->ip4_querier.addr.src.ip4 = saddr; /* update protected by general multicast_lock by caller */ - rcu_assign_pointer(brmctx->ip4_querier.port, port); + if (port) + brmctx->ip4_querier.port_ifidx = port->dev->ifindex; return true; } @@ -2875,7 +2876,8 @@ update: brmctx->ip6_querier.addr.src.ip6 = *saddr; /* update protected by general multicast_lock by caller */ - rcu_assign_pointer(brmctx->ip6_querier.port, port); + if (port) + brmctx->ip6_querier.port_ifidx = port->dev->ifindex; return true; } @@ -3675,7 +3677,7 @@ static void br_multicast_query_expired(struct net_bridge_mcast *brmctx, if (query->startup_sent < brmctx->multicast_startup_query_count) query->startup_sent++; - RCU_INIT_POINTER(querier->port, NULL); + querier->port_ifidx = 0; br_multicast_send_query(brmctx, NULL, query); out: spin_unlock(&brmctx->br->multicast_lock); @@ -3732,12 +3734,12 @@ void br_multicast_ctx_init(struct net_bridge *br, brmctx->multicast_membership_interval = 260 * HZ; brmctx->ip4_other_query.delay_time = 0; - brmctx->ip4_querier.port = NULL; + brmctx->ip4_querier.port_ifidx = 0; brmctx->multicast_igmp_version = 2; #if IS_ENABLED(CONFIG_IPV6) brmctx->multicast_mld_version = 1; brmctx->ip6_other_query.delay_time = 0; - brmctx->ip6_querier.port = NULL; + brmctx->ip6_querier.port_ifidx = 0; #endif timer_setup(&brmctx->ip4_mc_router_timer, @@ -4479,6 +4481,7 @@ bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) struct net_bridge *br; struct net_bridge_port *port; bool ret = false; + int port_ifidx; rcu_read_lock(); if (!netif_is_bridge_port(dev)) @@ -4493,14 +4496,16 @@ bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto) switch (proto) { case ETH_P_IP: + port_ifidx = brmctx->ip4_querier.port_ifidx; if (!timer_pending(&brmctx->ip4_other_query.timer) || - rcu_dereference(brmctx->ip4_querier.port) == port) + port_ifidx == port->dev->ifindex) goto unlock; break; #if IS_ENABLED(CONFIG_IPV6) case ETH_P_IPV6: + port_ifidx = brmctx->ip6_querier.port_ifidx; if (!timer_pending(&brmctx->ip6_other_query.timer) || - rcu_dereference(brmctx->ip6_querier.port) == port) + port_ifidx == port->dev->ifindex) goto unlock; break; #endif diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index c4a8fee990c9..30ca978676f3 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -81,7 +81,7 @@ struct bridge_mcast_other_query { /* selected querier */ struct bridge_mcast_querier { struct br_ip addr; - struct net_bridge_port __rcu *port; + int port_ifidx; }; /* IGMP/MLD statistics */ |