[SRU][N:linux-bluefield][PATCH v1 09/10] net/mlx5: Extend Ethtool loopback selftest to support non-linear SKB

[Stav Aviram]

From: Alexei Lazar <alazar at nvidia.com>

BugLink: https://bugs.launchpad.net/bugs/2126876

Current loopback test validation ignores non-linear SKB case in
the SKB access, which can lead to failures in scenarios such as
when HW GRO is enabled.
Linearize the SKB so both cases will be handled.

Signed-off-by: Alexei Lazar <alazar at nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea at nvidia.com>
Signed-off-by: Tariq Toukan <tariqt at nvidia.com>
Link: https://patch.msgid.link/20250209101716.112774-15-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
(cherry picked from commit 95b9606b15bb3ce1198d28d2393dd0e1f0a5f3e9)
Signed-off-by: Stav Aviram <saviram at nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
index 08a75654f5f1..c170503b3aac 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
@@ -165,6 +165,9 @@ mlx5e_test_loopback_validate(struct sk_buff *skb,
 	struct udphdr *udph;
 	struct iphdr *iph;
 
+	if (skb_linearize(skb))
+		goto out;
+
 	/* We are only going to peek, no need to clone the SKB */
 	if (MLX5E_TEST_PKT_SIZE - ETH_HLEN > skb_headlen(skb))
 		goto out;
-- 
2.38.1