netdev - Re: [PATCH v3] tcp: Use BPF timeout setting for SYN ACK RTO

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Date:   Wed, 3 Nov 2021 13:54:39 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Akhmat Karakotov <hmukos@...dex-team.ru>, kafai@...com
Cc:     brakmo@...com, eric.dumazet@...il.com, mitradir@...dex-team.ru,
        ncardwell@...gle.com, netdev@...r.kernel.org, ycheng@...gle.com,
        zeil@...dex-team.ru
Subject: Re: [PATCH v3] tcp: Use BPF timeout setting for SYN ACK RTO



On 11/3/21 1:46 PM, Akhmat Karakotov wrote:
> When setting RTO through BPF program, some SYN ACK packets were unaffected
> and continued to use TCP_TIMEOUT_INIT constant. This patch adds timeout
> option to struct request_sock. Option is initialized with TCP_TIMEOUT_INIT
> and is reassigned through BPF using tcp_timeout_init call. SYN ACK
> retransmits now use newly added timeout option.
> 
> Signed-off-by: Akhmat Karakotov <hmukos@...dex-team.ru>
> ---
>  include/net/request_sock.h      |  2 ++
>  include/net/tcp.h               |  2 +-
>  net/ipv4/inet_connection_sock.c |  4 +++-
>  net/ipv4/tcp_input.c            |  8 +++++---
>  net/ipv4/tcp_minisocks.c        | 12 +++++++++---
>  5 files changed, 20 insertions(+), 8 deletions(-)

SGTM, thanks.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>