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net_sched: act_ctinfo: use atomic64_t for three counters

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[ Upstream commit d300335b4e ]

Commit 21c167aa0b ("net/sched: act_ctinfo: use percpu stats")
missed that stats_dscp_set, stats_dscp_error and stats_cpmark_set
might be written (and read) locklessly.

Use atomic64_t for these three fields, I doubt act_ctinfo is used
heavily on big SMP hosts anyway.

Fixes: 24ec483cec ("net: sched: Introduce act_ctinfo action")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Pedro Tammela <pctammela@mojatatu.com>
Link: https://patch.msgid.link/20250709090204.797558-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2025-07-09 09:01:57 +00:00 committed by Greg Kroah-Hartman
parent cab2809944
commit 9cd1537036
2 changed files with 14 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/tc_act/tc_ctinfo.h
View File

@ -18,9 +18,9 @@ struct tcf_ctinfo_params {
struct tcf_ctinfo {
struct tc_action common;
struct tcf_ctinfo_params __rcu *params;
u64 stats_dscp_set;
u64 stats_dscp_error;
u64 stats_cpmark_set;
atomic64_t stats_dscp_set;
atomic64_t stats_dscp_error;
atomic64_t stats_cpmark_set;
};
enum {

19
net/sched/act_ctinfo.c
View File

@ -44,9 +44,9 @@ static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
ipv4_change_dsfield(ip_hdr(skb),
INET_ECN_MASK,
newdscp);
ca->stats_dscp_set++;
atomic64_inc(&ca->stats_dscp_set);
} else {
ca->stats_dscp_error++;
atomic64_inc(&ca->stats_dscp_error);
}
}
break;
@ -57,9 +57,9 @@ static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
ipv6_change_dsfield(ipv6_hdr(skb),
INET_ECN_MASK,
newdscp);
ca->stats_dscp_set++;
atomic64_inc(&ca->stats_dscp_set);
} else {
ca->stats_dscp_error++;
atomic64_inc(&ca->stats_dscp_error);
}
}
break;
@ -72,7 +72,7 @@ static void tcf_ctinfo_cpmark_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
struct tcf_ctinfo_params *cp,
struct sk_buff *skb)
{
ca->stats_cpmark_set++;
atomic64_inc(&ca->stats_cpmark_set);
skb->mark = READ_ONCE(ct->mark) & cp->cpmarkmask;
}
@ -322,15 +322,18 @@ static int tcf_ctinfo_dump(struct sk_buff *skb, struct tc_action *a,
}
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_SET,
ci->stats_dscp_set, TCA_CTINFO_PAD))
atomic64_read(&ci->stats_dscp_set),
TCA_CTINFO_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_ERROR,
ci->stats_dscp_error, TCA_CTINFO_PAD))
atomic64_read(&ci->stats_dscp_error),
TCA_CTINFO_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_CPMARK_SET,
ci->stats_cpmark_set, TCA_CTINFO_PAD))
atomic64_read(&ci->stats_cpmark_set),
TCA_CTINFO_PAD))
goto nla_put_failure;
spin_unlock_bh(&ci->tcf_lock);