[dpdk-dev] [PATCH v1] gso: fix marking TCP checksum flag in TCP segments

[Ophir Munk]

Large TCP packets which are marked with PKT_TX_TCP_SEG flag are
segmented and the flag is cleared in the resulting segments, however,
the segments checksum is not updated. It is therefore required to set
the PKT_TX_TCP_CKSUM flag in each TCP segment in order to mark for the
sending driver the need to update the TCP checksum before transmitting
the segment.

Fixes: 119583797b6a ("gso: support TCP/IPv4 GSO")
Cc: stable at dpdk.org

Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
 lib/librte_gso/rte_gso.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/librte_gso/rte_gso.c b/lib/librte_gso/rte_gso.c
index a44e3d4..e9ce9ce 100644
--- a/lib/librte_gso/rte_gso.c
+++ b/lib/librte_gso/rte_gso.c
@@ -50,12 +50,14 @@ rte_gso_segment(struct rte_mbuf *pkt,
 			((IS_IPV4_GRE_TCP4(pkt->ol_flags) &&
 			 (gso_ctx->gso_types & DEV_TX_OFFLOAD_GRE_TNL_TSO)))) {
 		pkt->ol_flags &= (~PKT_TX_TCP_SEG);
+		pkt->ol_flags |= PKT_TX_TCP_CKSUM;
 		ret = gso_tunnel_tcp4_segment(pkt, gso_size, ipid_delta,
 				direct_pool, indirect_pool,
 				pkts_out, nb_pkts_out);
 	} else if (IS_IPV4_TCP(pkt->ol_flags) &&
 			(gso_ctx->gso_types & DEV_TX_OFFLOAD_TCP_TSO)) {
 		pkt->ol_flags &= (~PKT_TX_TCP_SEG);
+		pkt->ol_flags |= PKT_TX_TCP_CKSUM;
 		ret = gso_tcp4_segment(pkt, gso_size, ipid_delta,
 				direct_pool, indirect_pool,
 				pkts_out, nb_pkts_out);
-- 
2.7.4