patch 'net/dpaa: fix checksum offload with empty L3 length' has been queued to stable release 25.11.3

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 25.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/04/26. 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/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/51f4252b7aa93562e27763b22b44d455b9c9b737

Thanks.

Kevin

---
>From 51f4252b7aa93562e27763b22b44d455b9c9b737 Mon Sep 17 00:00:00 2001
From: Hemant Agrawal <hemant.agrawal at nxp.com>
Date: Mon, 13 Jul 2026 15:47:45 +0530
Subject: [PATCH] net/dpaa: fix checksum offload with empty L3 length

[ upstream commit a1fad4fb708be358968f341624a2a5cb8afaa2a4 ]

In dpaa_checksum(), if mbuf->l3_len is zero the L4 header pointer
calculation (l3_hdr + mbuf->l3_len) points to the start of the L3
header rather than the L4 header, leading to incorrect checksum
computation. Add an early return guard when l3_len is zero.

A debug warning is logged to aid diagnosis of mbufs with
uninitialized or corrupt l3_len, since silently skipping checksum
offload would cause the packet to be transmitted without the
requested checksum.

Fixes: 5a8cf1bef775 ("net/dpaa: support checksum offload")

Signed-off-by: Hemant Agrawal <hemant.agrawal at nxp.com>
---
 drivers/net/dpaa/dpaa_rxtx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dpaa/dpaa_rxtx.c b/drivers/net/dpaa/dpaa_rxtx.c
index c5e393159a..3734496d6f 100644
--- a/drivers/net/dpaa/dpaa_rxtx.c
+++ b/drivers/net/dpaa/dpaa_rxtx.c
@@ -378,4 +378,8 @@ static inline void dpaa_checksum(struct rte_mbuf *mbuf)
 
 	DPAA_DP_LOG(DEBUG, "Calculating checksum for mbuf: %p", mbuf);
+	if (mbuf->l3_len == 0) {
+		DPAA_DP_LOG(WARNING, "l3_len is 0, skipping checksum for mbuf: %p", mbuf);
+		return;
+	}
 
 	if (((mbuf->packet_type & RTE_PTYPE_L3_MASK) == RTE_PTYPE_L3_IPV4) ||
-- 
2.55.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-07-30 10:16:03.884537964 +0100
+++ 0085-net-dpaa-fix-checksum-offload-with-empty-L3-length.patch	2026-07-30 10:16:01.508357829 +0100
@@ -1 +1 @@
-From a1fad4fb708be358968f341624a2a5cb8afaa2a4 Mon Sep 17 00:00:00 2001
+From 51f4252b7aa93562e27763b22b44d455b9c9b737 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit a1fad4fb708be358968f341624a2a5cb8afaa2a4 ]
+
@@ -17 +18,0 @@
-Cc: stable at dpdk.org