[PATCH v2 2/2] app/testpmd: fix SW L4 checksum in multi-segments

[Kevin Liu <kevinx.liu@intel.com>]

Testpmd forwards packets in checksum mode that it needs to calculate
the checksum of each layer's protocol.

In process_inner_cksums, when parsing tunnel packets, inner L4 offset should be
outer_l2_len + outer_l3_len + l2_len + l3_len.

In process_outer_cksums, when parsing tunnel packets, outer L4 offset should be
outer_l2_len + outer_l3_len.

Fixes: e6b9d6411e91 ("app/testpmd: add SW L4 checksum in multi-segments")
Cc: stable@dpdk.org

Signed-off-by: Kevin Liu <kevinx.liu@intel.com>
---
 app/test-pmd/csumonly.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index 02bc3929c7..c235456e58 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -513,7 +513,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 				ol_flags |= RTE_MBUF_F_TX_UDP_CKSUM;
 			} else {
 				if (info->is_tunnel)
-					l4_off = info->l2_len +
+					l4_off = info->outer_l2_len +
 						 info->outer_l3_len +
 						 info->l2_len + info->l3_len;
 				else
@@ -536,7 +536,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 			ol_flags |= RTE_MBUF_F_TX_TCP_CKSUM;
 		} else {
 			if (info->is_tunnel)
-				l4_off = info->l2_len + info->outer_l3_len +
+				l4_off = info->outer_l2_len + info->outer_l3_len +
 					 info->l2_len + info->l3_len;
 			else
 				l4_off = info->l2_len + info->l3_len;
@@ -625,7 +625,7 @@ process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 	if (udp_hdr->dgram_cksum != 0) {
 		udp_hdr->dgram_cksum = 0;
 		udp_hdr->dgram_cksum = get_udptcp_checksum(m, outer_l3_hdr,
-					info->l2_len + info->outer_l3_len,
+					info->outer_l2_len + info->outer_l3_len,
 					info->outer_ethertype);
 	}
 
-- 
2.33.1