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Message-ID: <c21f3ce9-632e-49c8-a740-a8004c886f3c@auristor.com>
Date:   Fri, 17 Nov 2023 01:04:25 -0500
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Subject: Re: [PATCH net 2/2] rxrpc: Defer the response to a PING ACK until
 we've parsed it
Content-Language: en-US
To:     David Howells <dhowells@redhat.com>, netdev@vger.kernel.org
Cc:     Marc Dionne <marc.dionne@auristor.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, linux-afs@lists.infradead.org,
        linux-kernel@vger.kernel.org
References: <20231116131259.103513-1-dhowells@redhat.com>
 <20231116131259.103513-3-dhowells@redhat.com>
From:   Jeffrey E Altman <jaltman@auristor.com>
Organization: AuriStor, Inc.
In-Reply-To: <20231116131259.103513-3-dhowells@redhat.com>
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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@redhat.com>
> cc: Marc Dionne <marc.dionne@auristor.com>
> cc: "David S. Miller" <davem@davemloft.net>
> cc: Eric Dumazet <edumazet@google.com>
> cc: Jakub Kicinski <kuba@kernel.org>
> cc: Paolo Abeni <pabeni@redhat.com>
> cc: linux-afs@lists.infradead.org
> cc: netdev@vger.kernel.org

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


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