netdev - Re: [PATCH net v4 2/2] vhost_net: fix tx queue stuck when sendmsg fails

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Date:   Wed, 23 Dec 2020 21:39:19 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     wangyunjian <wangyunjian@...wei.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        "Lilijun (Jerry)" <jerry.lilijun@...wei.com>,
        chenchanghu <chenchanghu@...wei.com>,
        xudingke <xudingke@...wei.com>,
        "huangbin (J)" <brian.huangbin@...wei.com>
Subject: Re: [PATCH net v4 2/2] vhost_net: fix tx queue stuck when sendmsg fails

On Wed, Dec 23, 2020 at 9:25 PM wangyunjian <wangyunjian@...wei.com> wrote:
>
> From: Yunjian Wang <wangyunjian@...wei.com>
>
> Currently the driver doesn't drop a packet which can't be sent by tun
> (e.g bad packet). In this case, the driver will always process the
> same packet lead to the tx queue stuck.
>
> To fix this issue:
> 1. in the case of persistent failure (e.g bad packet), the driver
> can skip this descriptor by ignoring the error.
> 2. in the case of transient failure (e.g -EAGAIN and -ENOMEM), the
> driver schedules the worker to try again.
>
> Fixes: 3a4d5c94e959 ("vhost_net: a kernel-level virtio server")
> Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>

Thanks.