[dpdk-dev] [PATCH] net/virtio: fix mbuf data and pkt length mismatch

Stephen Hemminger stephen at networkplumber.org
Mon Sep 23 17:22:00 CEST 2019

On Mon, 23 Sep 2019 22:05:11 +0800
Marvin Liu <yong.liu at intel.com> wrote:

> If reserve virtio header room by function rte_pktmbuf_prepend, both
> segment data length and packet length of mbuf will be increased.
> Data length will be equal to descriptor length, while packet length
> should be decreased as virtio-net header won't be taken into packet.
> Thus will cause mismatch in mbuf structure. Fix this issue by access
> mbuf data directly and increase descriptor length if it is needed.
> Fixes: 58169a9c8153 ("net/virtio: support Tx checksum offload")
> Fixes: 892dc798fa9c ("net/virtio: implement Tx path for packed queues")
> Fixes: 4905ed3a523f ("net/virtio: optimize Tx enqueue for packed ring")
> Fixes: e5f456a98d3c ("net/virtio: support in-order Rx and Tx")
> Cc: stable at dpdk.org
> Reported-by: Stephen Hemminger <stephen at networkplumber.org>
> Signed-off-by: Marvin Liu <yong.liu at intel.com>

Looks good, for current code.
Won't apply cleanly to 18.11. Could you send a version for that as well?

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