linux-kernel - Re: [PATCH net-next V2] virito-net: set queues after reset during xdp

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Message-Id: <20170220.222309.245000834571259773.davem@davemloft.net>
Date:   Mon, 20 Feb 2017 22:23:09 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.fastabend@...il.com
Subject: Re: [PATCH net-next V2] virito-net: set queues after reset during
 xdp_set

From: Jason Wang <jasowang@...hat.com>
Date: Mon, 20 Feb 2017 11:50:20 +0800

> We set queues before reset which will cause a crash[1]. This is
> because is_xdp_raw_buffer_queue() depends on the old xdp queue pairs
> number to do the correct detection. So fix this by
> 
> - passing xdp queue pairs and current queue pairs to virtnet_reset()
> - change vi->xdp_qp after reset but before refill, to make sure both
>   free_unused_bufs() and refill can make correct detection of XDP.
> - remove the duplicated queue pairs setting before virtnet_reset()
>   since we will do it inside virtnet_reset()
> 
> [1]
 ...
> Fixes: 2de2f7f40ef9 ("virtio_net: XDP support for adjust_head")
> Cc: John Fastabend <john.fastabend@...il.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied and queued up for -stable, thanks Jason.