Messages in this thread | | | Subject | Re: [PATCH net 3/4] virtio-net: reset num_buf to 1 after linearizing packet | From | Jason Wang <> | Date | Tue, 22 May 2018 11:36:18 +0800 |
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On 2018年05月21日 22:59, Michael S. Tsirkin wrote: > On Mon, May 21, 2018 at 04:35:05PM +0800, Jason Wang wrote: >> If we successfully linearize the packets, num_buf were set to zero >> which was wrong since we now have only 1 buffer to be used for e.g in >> the error path of receive_mergeable(). Zero num_buf will lead the code >> try to pop the buffers of next packet and drop it. Fixing this by set >> num_buf to 1 if we successfully linearize the packet. >> >> Fixes: 4941d472bf95 ("virtio-net: do not reset during XDP set") >> Signed-off-by: Jason Wang <jasowang@redhat.com> >> --- >> drivers/net/virtio_net.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c >> index 6260d65..165a922 100644 >> --- a/drivers/net/virtio_net.c >> +++ b/drivers/net/virtio_net.c >> @@ -722,6 +722,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, >> &len); >> if (!xdp_page) >> goto err_xdp; >> + num_buf = 1; > So this is tweaked here for the benefit of err_skb below. > That's confusing and we won't remember to change it > if we change the error handling. > > How about fixing the error path? > > > - while (--num_buf) { > + while (num_buf-- > 1) { > > Seems more robust to me.
Looks good, will do this in V2.
Thanks
> >> offset = VIRTIO_XDP_HEADROOM; >> } else { >> xdp_page = page; >> -- >> 2.7.4
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