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docs: networking: timestamping: mention MSG_EOR flag

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TCP got MSG_EOR support in linux-4.7.

This is a canonical way of making sure no coalescing
will be performed on the skb, even if it could not be
immediately sent.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20231212110608.3673677-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-12-12 11:06:08 +00:00 committed by Jakub Kicinski
parent 85c2674d53
commit 173b6d1cdf
1 changed files with 2 additions and 1 deletions
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Documentation/networking/timestamping.rst
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@ -357,7 +357,8 @@ enabling SOF_TIMESTAMPING_OPT_ID and comparing the byte offset at
send time with the value returned for each timestamp. It can prevent
the situation by always flushing the TCP stack in between requests,
for instance by enabling TCP_NODELAY and disabling TCP_CORK and
autocork.
autocork. After linux-4.7, a better way to prevent coalescing is
to use MSG_EOR flag at sendmsg() time.
These precautions ensure that the timestamp is generated only when all
bytes have passed a timestamp point, assuming that the network stack