tcp_vu, udp_vu: Account for virtio net header in minimum frame size

In the vhost-user paths, the buffers provided by the virtio queue
include the virtio net header (VNET_HLEN) prepended to the Ethernet
frame. The minimum size checks using ETH_ZLEN must therefore account
for this additional header length, otherwise we underestimate the
minimum buffer size needed.

Use ETH_ZLEN + VNET_HLEN instead of bare ETH_ZLEN in vu_collect()
calls and the corresponding ASSERT() checks.

In tcp_vu_prepare(), revert the ASSERT to just check for hdrlen,
because at that point iov[0].iov_len has been trimmed to the actual
received data size plus headers.

Fixes: 0cb8f9003654 ("tcp, udp: Pad batched frames for vhost-user modes to 60 bytes (802.3 minimum)")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions