net/mlx4_en: CHECKSUM_COMPLETE support for fragments

Refine the RX check summing handling to propagate the
hardware provided checksum so that we do not have to
compute it later in software.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 6 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 05787efef492..5c613c6663da 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -821,14 +821,12 @@ xdp_drop_no_cnt:
                 skb_record_rx_queue(skb, cq_ring);
 
                 if (likely(dev->features & NETIF_F_RXCSUM)) {
-                        if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
-                                                      MLX4_CQE_STATUS_UDP)) {
+                        if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
+                                                       MLX4_CQE_STATUS_UDP)) &&
+                            (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
+                            cqe->checksum == cpu_to_be16(0xffff)) {
                                 bool l2_tunnel;
 
-                                if (!((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
-                                      cqe->checksum == cpu_to_be16(0xffff)))
-                                        goto csum_none;
-
                                 l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
                                         (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
                                 ip_summed = CHECKSUM_UNNECESSARY;