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tcp: support TCP_DELACK_MAX_US for set/getsockopt use

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Support adjusting/reading delayed ack max for socket level by using
set/getsockopt().

This option aligns with TCP_BPF_DELACK_MAX usage. Considering that bpf
option was implemented before this patch, so we need to use a standalone
new option for pure tcp set/getsockopt() use.

Add WRITE_ONCE/READ_ONCE() to prevent data-race if setsockopt()
happens to write one value to icsk_delack_max while icsk_delack_max is
being read.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250317120314.41404-3-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason Xing
2025-03-25 04:27:20 -07:00
committed by Jakub Kicinski
parent f38805c5d2
commit 9552f90835
3 changed files with 14 additions and 2 deletions
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include/uapi/linux/tcp.h
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@@ -141,6 +141,7 @@ enum {
#define TCP_IS_MPTCP 43 /* Is MPTCP being used? */
#define TCP_RTO_MAX_MS 44 /* max rto time in ms */
#define TCP_RTO_MIN_US 45 /* min rto time in us */
#define TCP_DELACK_MAX_US 46 /* max delayed ack time in us */
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF 0