[dpdk-stable] patch 'app/testpmd: fix Tx checksum calculation for tunnel' has been queued to stable release 20.11.3

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/05/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/c9c391ea6083a312e532f1f3139d36eb7b3de20e

Thanks.

Luca Boccassi

---
>From c9c391ea6083a312e532f1f3139d36eb7b3de20e Mon Sep 17 00:00:00 2001
From: Gregory Etelson <getelson at nvidia.com>
Date: Thu, 29 Jul 2021 20:01:41 +0300
Subject: [PATCH] app/testpmd: fix Tx checksum calculation for tunnel

[ upstream commit b2a9e4a855d0e5b4e3fdba5b126bcf00aa8f0ada ]

csumonly engine calculates Tx checksum of a tunnelled packet
for outer headers only or separately for outer and inner headers.
The calculation method is determined by checksum configuration options.
If Tx checksum calculation is separated,
the inner headers are processed before outer headers.

Inner headers processing sets checksum values to 0 unconditionally.
If Tx configuration offloads inner checksums only, outer checksum
calculation in software will read 0 instead of real values
and produce wrong result.

The patch zeroes inner checksums only before software calculation.

Fixes: 6b520d54ebfe ("app/testpmd: use Tx preparation in checksum engine")

Signed-off-by: Gregory Etelson <getelson at nvidia.com>
Acked-by: Ori Kam <orika at nvidia.com>
Acked-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Acked-by: Xiaoyun Li <xiaoyun.li at intel.com>
Acked-by: Olivier Matz <olivier.matz at 6wind.com>
---
 app/test-pmd/csumonly.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index d813d4fae0..73a78f955c 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -480,17 +480,18 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 
 	if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 		ipv4_hdr = l3_hdr;
-		ipv4_hdr->hdr_checksum = 0;
 
 		ol_flags |= PKT_TX_IPV4;
 		if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 			ol_flags |= PKT_TX_IP_CKSUM;
 		} else {
-			if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
+			if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM) {
 				ol_flags |= PKT_TX_IP_CKSUM;
-			else
+			} else if (ipv4_hdr->hdr_checksum != 0) {
+				ipv4_hdr->hdr_checksum = 0;
 				ipv4_hdr->hdr_checksum =
 					rte_ipv4_cksum(ipv4_hdr);
+			}
 		}
 	} else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV6))
 		ol_flags |= PKT_TX_IPV6;
@@ -501,10 +502,10 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 		udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len);
 		/* do not recalculate udp cksum if it was 0 */
 		if (udp_hdr->dgram_cksum != 0) {
-			udp_hdr->dgram_cksum = 0;
-			if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
+			if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM) {
 				ol_flags |= PKT_TX_UDP_CKSUM;
-			else {
+			} else {
+				udp_hdr->dgram_cksum = 0;
 				udp_hdr->dgram_cksum =
 					get_udptcp_checksum(l3_hdr, udp_hdr,
 						info->ethertype);
@@ -514,12 +515,12 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 			ol_flags |= PKT_TX_UDP_SEG;
 	} else if (info->l4_proto == IPPROTO_TCP) {
 		tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
-		tcp_hdr->cksum = 0;
 		if (tso_segsz)
 			ol_flags |= PKT_TX_TCP_SEG;
-		else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
+		else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM) {
 			ol_flags |= PKT_TX_TCP_CKSUM;
-		else {
+		} else if (tcp_hdr->cksum != 0) {
+			tcp_hdr->cksum = 0;
 			tcp_hdr->cksum =
 				get_udptcp_checksum(l3_hdr, tcp_hdr,
 					info->ethertype);
@@ -529,13 +530,13 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 	} else if (info->l4_proto == IPPROTO_SCTP) {
 		sctp_hdr = (struct rte_sctp_hdr *)
 			((char *)l3_hdr + info->l3_len);
-		sctp_hdr->cksum = 0;
 		/* sctp payload must be a multiple of 4 to be
 		 * offloaded */
 		if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 			((ipv4_hdr->total_length & 0x3) == 0)) {
 			ol_flags |= PKT_TX_SCTP_CKSUM;
-		} else {
+		} else if (sctp_hdr->cksum != 0) {
+			sctp_hdr->cksum = 0;
 			/* XXX implement CRC32c, example available in
 			 * RFC3309 */
 		}
-- 
2.30.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-08-03 12:35:08.906339131 +0100
+++ 0017-app-testpmd-fix-Tx-checksum-calculation-for-tunnel.patch	2021-08-03 12:35:08.238819208 +0100
@@ -1 +1 @@
-From b2a9e4a855d0e5b4e3fdba5b126bcf00aa8f0ada Mon Sep 17 00:00:00 2001
+From c9c391ea6083a312e532f1f3139d36eb7b3de20e Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit b2a9e4a855d0e5b4e3fdba5b126bcf00aa8f0ada ]
+
@@ -20 +21,0 @@
-Cc: stable at dpdk.org
@@ -32 +33 @@
-index 0161f72175..bd5ad64a57 100644
+index d813d4fae0..73a78f955c 100644