[dpdk-dev] [PATCH 3/5] net/virtio: do not touch Tx offload flags

[David Marchand <david.marchand@redhat.com>]

Tx offload flags are of the application responsibility.
Leave the mbuf alone and use a local storage for implicit tcp checksum
offloading in case of TSO.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/virtio/virtqueue.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 71b66f3208..2e8826bc28 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -618,10 +618,12 @@ virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
 			uint8_t offload)
 {
 	if (offload) {
+		uint64_t csum_l4 = cookie->ol_flags & PKT_TX_L4_MASK;
+
 		if (cookie->ol_flags & PKT_TX_TCP_SEG)
-			cookie->ol_flags |= PKT_TX_TCP_CKSUM;
+			csum_l4 |= PKT_TX_TCP_CKSUM;
 
-		switch (cookie->ol_flags & PKT_TX_L4_MASK) {
+		switch (csum_l4) {
 		case PKT_TX_UDP_CKSUM:
 			hdr->csum_start = cookie->l2_len + cookie->l3_len;
 			hdr->csum_offset = offsetof(struct rte_udp_hdr,
-- 
2.23.0