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net/sched: cls_api: conditional notification of events

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[ Upstream commit 93775590b1 ]

As of today tc-filter/chain events are unconditionally built and sent to
RTNLGRP_TC. As with the introduction of rtnl_notify_needed we can check
before-hand if they are really needed. This will help to alleviate
system pressure when filters are concurrently added without the rtnl
lock as in tc-flower.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20231208192847.714940-8-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 369609fc62 ("tc: Ensure we have enough buffer space when sending filter netlink notifications")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pedro Tammela
2023-12-08 16:28:47 -03:00
committed by Greg Kroah-Hartman
parent aa258dbf45
commit 28f2cd143b
1 changed files with 12 additions and 0 deletions
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net/sched/cls_api.c
+12
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@@ -2038,6 +2038,9 @@ static int tfilter_notify(struct net *net, struct sk_buff *oskb,
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
int err = 0;
if (!unicast && !rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
return 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
@@ -2067,6 +2070,9 @@ static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
int err;
if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
return tp->ops->delete(tp, fh, last, rtnl_held, extack);
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
@@ -2891,6 +2897,9 @@ static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
struct sk_buff *skb;
int err = 0;
if (!unicast && !rtnl_notify_needed(net, flags, RTNLGRP_TC))
return 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
@@ -2920,6 +2929,9 @@ static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
struct net *net = block->net;
struct sk_buff *skb;
if (!rtnl_notify_needed(net, flags, RTNLGRP_TC))
return 0;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;