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tcp: move recvmsg_inq to tcp_sock_read_txrx

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Fill a hole in tcp_sock_read_txrx, instead of possibly wasting
a cache line.

Note that tcp_recvmsg_locked() is also reading tp->repair,
so this removes one cache line miss in tcp recvmsg().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250919204856.2977245-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-09-19 20:48:53 +00:00 committed by Jakub Kicinski
parent 1b44d70002
commit 969904dcd7
2 changed files with 3 additions and 3 deletions
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2
Documentation/networking/net_cachelines/tcp_sock.rst
View File

@ -57,7 +57,7 @@ u8:1 is_sack_reneg read_m
u8:2 fastopen_client_fail
u8:4 nonagle read_write tcp_skb_entail,tcp_push_pending_frames
u8:1 thin_lto
u8:1 recvmsg_inq
u8:1 recvmsg_inq read_mostly tcp_recvmsg
u8:1 repair read_mostly tcp_write_xmit
u8:1 frto
u8 repair_queue

4
include/linux/tcp.h
View File

@ -232,7 +232,8 @@ struct tcp_sock {
repair : 1,
tcp_usec_ts : 1, /* TSval values in usec */
is_sack_reneg:1, /* in recovery from loss with SACK reneg? */
is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */
is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */
recvmsg_inq : 1;/* Indicate # of bytes in queue upon recvmsg */
__cacheline_group_end(tcp_sock_read_txrx);
/* RX read-mostly hotpath cache lines */
@ -252,7 +253,6 @@ struct tcp_sock {
#if defined(CONFIG_TLS_DEVICE)
void (*tcp_clean_acked)(struct sock *sk, u32 acked_seq);
#endif
u8 recvmsg_inq : 1;/* Indicate # of bytes in queue upon recvmsg */
__cacheline_group_end(tcp_sock_read_rx);
/* TX read-write hotpath cache lines */