netdev - Re: [PATCH net 2/2] rxrpc: Defer the response to a PING ACK until we've parsed it

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Date: Fri, 17 Nov 2023 01:04:25 -0500
From: Jeffrey E Altman <jaltman@...istor.com>
To: David Howells <dhowells@...hat.com>, netdev@...r.kernel.org
Cc: Marc Dionne <marc.dionne@...istor.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] rxrpc: Defer the response to a PING ACK until
 we've parsed it

On 11/16/2023 8:12 AM, David Howells wrote:

> Defer the generation of a PING RESPONSE ACK in response to a PING ACK until
> we've parsed the PING ACK so that we pick up any changes to the packet
> queue so that we can update ackinfo.
>
> This is also applied to an ACK generated in response to an ACK with the
> REQUEST_ACK flag set.
>
> Note that whilst the problem was added in commit 248f219cb8bc, it didn't
> really matter at that point because the ACK was proposed in softirq mode
> and generated asynchronously later in process context, taking the latest
> values at the time.  But this fix is only needed since the move to parse
> incoming packets in an I/O thread rather than in softirq and generate the
> ACK at point of proposal (b0346843b1076b34a0278ff601f8f287535cb064).
>
> Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code")
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Marc Dionne <marc.dionne@...istor.com>
> cc: "David S. Miller" <davem@...emloft.net>
> cc: Eric Dumazet <edumazet@...gle.com>
> cc: Jakub Kicinski <kuba@...nel.org>
> cc: Paolo Abeni <pabeni@...hat.com>
> cc: linux-afs@...ts.infradead.org
> cc: netdev@...r.kernel.org

Reviewed-by: Jeffrey Altman <jaltman@...istor.com>


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