On Mon, Feb 24, 2020 at 8:26 AM <anton.ivanov@xxxxxxxxxxxxxxxxxx> wrote:
>
> From: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
>
> Some of the locally generated frames marked as GSO which
> arrive at virtio_net_hdr_from_skb() have no GSO_TYPE, no
> fragments (data_len = 0) and length significantly shorter
> than the MTU (752 in my experiments).
Do we understand how these packets are generated? Else it seems this
might be papering over a deeper problem.
The stack should not create GSO packets less than or equal to
skb_shinfo(skb)->gso_size. See for instance the check in
tcp_gso_segment after pulling the tcp header:
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss))
goto out;
What is the gso_type, and does it include SKB_GSO_DODGY?
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