netdev - Re: [PATCH net v2] tcp: fix mishandling when the sack compression is deferred

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Message-ID: <CANn89iKopAb_TGWtqHZB40Gs9VW=UfLj+h2za1=Pr8c6+Lcn=Q@mail.gmail.com>
Date: Tue, 30 May 2023 16:50:55 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Jason Xing <kerneljasonxing@...il.com>
Cc: fuyuanli <fuyuanli@...iglobal.com>, "David S. Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Neal Cardwell <ncardwell@...gle.com>, ycheng <ycheng@...gle.com>, toke <toke@...e.dk>, 
	netdev@...r.kernel.org, Weiping Zhang <zhangweiping@...iglobal.com>, 
	Tio Zhang <tiozhang@...iglobal.com>
Subject: Re: [PATCH net v2] tcp: fix mishandling when the sack compression is deferred

On Tue, May 30, 2023 at 4:32 PM Jason Xing <kerneljasonxing@...il.com> wrote:
>
> I'm confused. You said in the previous email:
> "As a bonus, no need to send one patch for net, and another in net-next,
> trying to 'fix' issues that should have been fixed cleanly in a single patch."
>
> So we added "introducing ICSK_ACK_TIMER flag for sack compression" to
> fix them on top of the patch you suggested.
>
> I can remove the Suggested-by label. For now, I do care about your
> opinion on the current patch.
>
> Well...should I give up introducing that flag and then leave that
> 'issue' behind? :S

Please let the fix go alone.

Then I will look at your patch, but honestly I fail to see the _reason_ for it.

In case you missed it, tcp_event_ack_sent() calls
inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);