netdev - Re: [PATCH net-next] virtio-net: invoke zerocopy callback on xmit path if no tx napi

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Date:   Tue, 29 Aug 2017 15:53:08 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Koichiro Den <den@...ipeden.com>, Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] virtio-net: invoke zerocopy callback on xmit
 path if no tx napi

On Tue, Aug 29, 2017 at 3:42 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> On Tue, Aug 29, 2017 at 03:35:38PM -0400, Willem de Bruijn wrote:
>> By the way, I have had an unrelated patch outstanding for a while
>> to have virtio-net support the VIRTIO_CONFIG_S_NEEDS_RESET
>> command. Will send that as RFC.
>
> Oh nice.

Great :)

> One needs to be careful about locking there which is why
> no devices support that yet.

I originally wrote it based on the virtnet_reset function introduced
for xdp. Calling this from virtnet_config_changed_work is non trivial,
as virtnet_freeze_down waits until no config worker is running.

Otherwise, I could not find any constraints on when freeze may be
called, and it largely follows the same path. I hope I didn't miss anything.