# Re: \[PATCH v3\] tcp: Use BPF timeout setting for SYN ACK RTO

- From: Eric Dumazet \<hidden\>
- Date: 2021-11-03 20:54:43 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/11/11215611
- Thread: https://ratatoskr.run/netdev/2021/10/11214414/t.md

```text


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 <redacted>
> ---
>  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 <redacted>

```