[dpdk-dev] [PATCH] app/testpmd: fix IPv4 checksum

[Gregory Etelson]

UDP protocol reserves 0 checksum value for special purposes.
Other protocols, like IPv4, TCP and SCTP must calculate checksum value
in software or offload checksum calculation to hardware.

If IPv4 TX checksum offload was off and header checksum was set to 0,
testpmd csum engine did not calculate checksum value for IPv4, TCP and
SCTP.

The patch always calculates IPv4, TCP and SCTP TX checksums if it is
not offloaded.

Fixes: b2a9e4a855d0 ("app/testpmd: fix Tx checksum calculation for tunnel")

Signed-off-by: Gregory Etelson <getelson at nvidia.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 bd5ad64a57..607c889359 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -487,7 +487,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 		} else {
 			if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM) {
 				ol_flags |= PKT_TX_IP_CKSUM;
-			} else if (ipv4_hdr->hdr_checksum != 0) {
+			} else {
 				ipv4_hdr->hdr_checksum = 0;
 				ipv4_hdr->hdr_checksum =
 					rte_ipv4_cksum(ipv4_hdr);
@@ -519,7 +519,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 			ol_flags |= PKT_TX_TCP_SEG;
 		else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM) {
 			ol_flags |= PKT_TX_TCP_CKSUM;
-		} else if (tcp_hdr->cksum != 0) {
+		} else {
 			tcp_hdr->cksum = 0;
 			tcp_hdr->cksum =
 				get_udptcp_checksum(l3_hdr, tcp_hdr,
@@ -535,7 +535,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 		if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 			((ipv4_hdr->total_length & 0x3) == 0)) {
 			ol_flags |= PKT_TX_SCTP_CKSUM;
-		} else if (sctp_hdr->cksum != 0) {
+		} else {
 			sctp_hdr->cksum = 0;
 			/* XXX implement CRC32c, example available in
 			 * RFC3309 */
-- 
2.32.0