> -----Original Message-----
> From: Ivan Malov <ivan.ma...@oktetlabs.ru>
> Sent: Friday, September 17, 2021 2:50 AM
> To: dev@dpdk.org
> Cc: Maxime Coquelin <maxime.coque...@redhat.com>; sta...@dpdk.org; Andrew
> Rybchenko <andrew.rybche...@oktetlabs.ru>; Xia, Chenbo <chenbo....@intel.com>;
> Yuanhan Liu <yuanhan....@linux.intel.com>; Olivier Matz
> <olivier.m...@6wind.com>
> Subject: [PATCH v2] net/virtio: handle Tx checksums correctly for tunnel
> packets
>
> Tx prepare method calls rte_net_intel_cksum_prepare(), which
> handles tunnel packets correctly, but Tx burst path does not
> take tunnel presence into account when computing the offsets.
>
> Fixes: 58169a9c8153 ("net/virtio: support Tx checksum offload")
> Cc: sta...@dpdk.org
>
> Signed-off-by: Ivan Malov <ivan.ma...@oktetlabs.ru>
> Reviewed-by: Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>
> ---
> drivers/net/virtio/virtqueue.h | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
> index 03957b2bd0..b83ff32efb 100644
> --- a/drivers/net/virtio/virtqueue.h
> +++ b/drivers/net/virtio/virtqueue.h
> @@ -620,19 +620,21 @@ static inline void
> virtqueue_xmit_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *cookie)
> {
> uint64_t csum_l4 = cookie->ol_flags & PKT_TX_L4_MASK;
> + uint16_t o_l23_len = (cookie->ol_flags & PKT_TX_TUNNEL_MASK) ?
> + cookie->outer_l2_len + cookie->outer_l3_len : 0;
>
> if (cookie->ol_flags & PKT_TX_TCP_SEG)
> csum_l4 |= PKT_TX_TCP_CKSUM;
>
> switch (csum_l4) {
> case PKT_TX_UDP_CKSUM:
> - hdr->csum_start = cookie->l2_len + cookie->l3_len;
> + hdr->csum_start = o_l23_len + cookie->l2_len + cookie->l3_len;
> hdr->csum_offset = offsetof(struct rte_udp_hdr, dgram_cksum);
> hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
> break;
>
> case PKT_TX_TCP_CKSUM:
> - hdr->csum_start = cookie->l2_len + cookie->l3_len;
> + hdr->csum_start = o_l23_len + cookie->l2_len + cookie->l3_len;
> hdr->csum_offset = offsetof(struct rte_tcp_hdr, cksum);
> hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
> break;
> @@ -650,7 +652,8 @@ virtqueue_xmit_offload(struct virtio_net_hdr *hdr, struct
> rte_mbuf *cookie)
> VIRTIO_NET_HDR_GSO_TCPV6 :
> VIRTIO_NET_HDR_GSO_TCPV4;
> hdr->gso_size = cookie->tso_segsz;
> - hdr->hdr_len = cookie->l2_len + cookie->l3_len + cookie->l4_len;
> + hdr->hdr_len = o_l23_len + cookie->l2_len + cookie->l3_len +
> + cookie->l4_len;
> } else {
> ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
> ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
> --
> 2.20.1
Reviewed-by: Chenbo Xia <chenbo....@intel.com>
