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virtio-net: disable the hole mechanism for xdp

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XDP core assumes that the frame_size of xdp_buff and the length of
the frag are PAGE_SIZE. The hole may cause the processing of xdp to
fail, so we disable the hole mechanism when xdp is set.

Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heng Qi 2023-01-14 16:22:20 +08:00 committed by David S. Miller
parent 5129bd8e88
commit 484beac2ff
1 changed files with 4 additions and 1 deletions
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5
drivers/net/virtio_net.c
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@ -1426,8 +1426,11 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi,
/* To avoid internal fragmentation, if there is very likely not
* enough space for another buffer, add the remaining space to
* the current buffer.
* XDP core assumes that frame_size of xdp_buff and the length
* of the frag are PAGE_SIZE, so we disable the hole mechanism.
*/
len += hole;
if (!headroom)
len += hole;
alloc_frag->offset += hole;
}