[PATCH 6.1 441/473] net/mlx5e: Fix UDP GSO for encapsulated packets

Greg Kroah-Hartman
2024-06-06T14:20:51Z

From: Gal Pressman <gal@nvidia.com>

[ Upstream commit 83fea49f2711fc90c0d115b0ed04046b45155b65 ]

When the skb is encapsulated, adjust the inner UDP header instead of the
outer one, and account for UDP header (instead of TCP) in the inline
header size calculation.

Fixes: 689adf0d4892 ("net/mlx5e: Add UDP GSO support")
Reported-by: Jason Baron <jbaron@akamai.com>
Closes: https://lore.kernel.org/netdev/c42961cb-50b9-4a9a-bd43-87fe48d88d29@akamai.com/
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Boris Pismenny <borisp@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h | 8 +++++++-
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c | 6 +++++-
2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
index 07187028f0d35..1445a9a46baea 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
@@ -102,8 +102,14 @@ static inline void
mlx5e_udp_gso_handle_tx_skb(struct sk_buff *skb)
{
int payload_len = skb_shinfo(skb)->gso_size + sizeof(struct udphdr);
+ struct udphdr *udphdr;

- udp_hdr(skb)->len = htons(payload_len);
+ if (skb->encapsulation)
+ udphdr = (struct udphdr *)skb_inner_transport_header(skb);
+ else
+ udphdr = udp_hdr(skb);
+
+ udphdr->len = htons(payload_len);
}

struct mlx5e_accel_tx_state {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
index a6d7e2cfcd0e1..e6e792a38a640 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
@@ -153,7 +153,11 @@ mlx5e_tx_get_gso_ihs(struct mlx5e_txqsq *sq, struct sk_buff *skb, int *hopbyhop)

*hopbyhop = 0;
if (skb->encapsulation) {
- ihs = skb_inner_tcp_all_headers(skb);
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
+ ihs = skb_inner_transport_offset(skb) +
+ sizeof(struct udphdr);
+ else
+ ihs = skb_inner_tcp_all_headers(skb);
stats->tso_inner_packets++;
stats->tso_inner_bytes += skb->len - ihs;
} else {
--
2.43.0