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tcp: reclaim 8 bytes in struct request_sock_queue

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synflood_warned had to be u32 for xchg(), but ensuring
atomicity is not really needed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250919204856.2977245-9-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-09-19 20:48:56 +00:00
committed by Jakub Kicinski
parent 31c4511bbb
commit 649091ef59
2 changed files with 3 additions and 3 deletions
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2
include/net/request_sock.h
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@@ -185,8 +185,8 @@ struct fastopen_queue {
struct request_sock_queue {
spinlock_t rskq_lock;
u8 rskq_defer_accept;
u8 synflood_warned;
u32 synflood_warned;
atomic_t qlen;
atomic_t young;

4
net/ipv4/tcp_input.c
View File

@@ -7282,8 +7282,8 @@ static bool tcp_syn_flood_action(struct sock *sk, const char *proto)
#endif
__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP);
if (!READ_ONCE(queue->synflood_warned) && syncookies != 2 &&
xchg(&queue->synflood_warned, 1) == 0) {
if (syncookies != 2 && !READ_ONCE(queue->synflood_warned)) {
WRITE_ONCE(queue->synflood_warned, 1);
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_family == AF_INET6) {
net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",
proto, inet6_rcv_saddr(sk),