Re: [PATCH net] virtio-net: alloc big buffers also when guest can receive UFO
From: Jason Wang <jasowang@redhat.com>
Date: 2014-02-13 03:02:32
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On 02/12/2014 07:59 PM, Michael S. Tsirkin wrote:
On Wed, Feb 12, 2014 at 01:43:28PM +0800, Jason Wang wrote:quoted
quoted
We should alloc big buffers also when guest can receive UFO pakcets. Otherwise the big packets will be truncated when mergeable rx buffer is disabled.Not truncated, they will be dropped.
Why dropped? We enable the ufo on tap0 if VIRTIO_NET_F_GUEST_UFO is negotiated. So skb was queued on the receive queue. But since the receive buffer is small, it will be truncated during tun_put_user().