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| author | Jason Xing <kerneljasonxing@gmail.com> | 2025-03-17 20:03:13 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-03-25 04:27:19 -0700 |
| commit | f38805c5d26fe4af97837c10d58074a7496638bf (patch) | |
| tree | d19c016a9c6069ab703e7c2d7d64abcd95952674 /include/uapi | |
| parent | Merge branch 'mlxsw-add-vxlan-to-the-same-hardware-domain-as-physical-bridge-... (diff) | |
| download | linux-f38805c5d26fe4af97837c10d58074a7496638bf.tar.gz linux-f38805c5d26fe4af97837c10d58074a7496638bf.zip | |
tcp: support TCP_RTO_MIN_US for set/getsockopt use
Support adjusting/reading RTO MIN for socket level by using set/getsockopt().
This new option has the same effect as TCP_BPF_RTO_MIN, which means it
doesn't affect RTAX_RTO_MIN usage (by using ip route...). Considering that
bpf option was implemented before this patch, so we need to use a standalone
new option for pure tcp set/getsockopt() use.
When the socket is created, its icsk_rto_min is set to the default
value that is controlled by sysctl_tcp_rto_min_us. Then if application
calls setsockopt() with TCP_RTO_MIN_US flag to pass a valid value, then
icsk_rto_min will be overridden in jiffies unit.
This patch adds WRITE_ONCE/READ_ONCE to avoid data-race around
icsk_rto_min.
Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250317120314.41404-2-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 92a2e79222ea..a126b3860e63 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -140,6 +140,7 @@ 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_REPAIR_ON 1 #define TCP_REPAIR_OFF 0 |