From: Simon Horman <simon.horman@corigine.com>
To: Duan Muquan <duanmuquan@baidu.com>
Cc: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] tcp: fix connection reset due to tw hashdance race.
Date: Tue, 6 Jun 2023 10:57:50 +0200 [thread overview]
Message-ID: <ZH71DvVRewnmRdC9@corigine.com> (raw)
In-Reply-To: <20230605035140.89106-1-duanmuquan@baidu.com>
On Mon, Jun 05, 2023 at 11:51:40AM +0800, Duan Muquan wrote:
...
> Brief of the scenario:
>
> 1. Server runs on CPU 0 and Client runs on CPU 1. Server closes
> connection actively and sends a FIN to client. The lookback's driver
> enqueues the FIN segment to backlog queue of CPU 0 via
> loopback_xmit()->netif_rx(), one of the conditions for non-delay ack
> meets in __tcp_ack_snd_check(), and the ACK is sent immediately.
>
> 2. On loopback interface, the ACK is received and processed on CPU 0,
> the 'dance' from original sock to tw sock will perfrom, tw sock will
Hi Duan Muquan,
a minor nit from my side: perfrom -> perform
> be inserted to ehash table, then the original sock will be removed.
...
next prev parent reply other threads:[~2023-06-06 8:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-05 3:51 [PATCH v1] tcp: fix connection reset due to tw hashdance race Duan Muquan
2023-06-05 4:56 ` Jason Xing
2023-06-06 8:57 ` Simon Horman [this message]
2023-06-07 12:01 ` Duan,Muquan
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