net/mlx4_en: Fix wrong csum complete report when rxvlan offload is disabled

[ Upstream commit 79a258526ce1051cb9684018c25a89d51ac21be8 ]

The check_csum() function relied on hwtstamp_rx_filter to know if rxvlan
offload is disabled. This is wrong since rxvlan offload can be switched
on/off regardless of hwtstamp_rx_filter.

Also moved check_csum to query CQE information to identify VLAN packets
and removed the check of IP packets, since it has been validated before.

Fixes: f8c6455bb04b ('net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE')
Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 11 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 2a77a6b19121..eab4e080ebd2 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -723,7 +723,7 @@ static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
 }
 #endif
 static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
-                      int hwtstamp_rx_filter)
+                      netdev_features_t dev_features)
 {
         __wsum hw_checksum = 0;
 
@@ -731,14 +731,8 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
 
         hw_checksum = csum_unfold((__force __sum16)cqe->checksum);
 
-        if (((struct ethhdr *)va)->h_proto == htons(ETH_P_8021Q) &&
-            hwtstamp_rx_filter != HWTSTAMP_FILTER_NONE) {
-                /* next protocol non IPv4 or IPv6 */
-                if (((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
-                    != htons(ETH_P_IP) &&
-                    ((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
-                    != htons(ETH_P_IPV6))
-                        return -1;
+        if (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK) &&
+            !(dev_features & NETIF_F_HW_VLAN_CTAG_RX)) {
                 hw_checksum = get_fixed_vlan_csum(hw_checksum, hdr);
                 hdr += sizeof(struct vlan_hdr);
         }
@@ -901,7 +895,8 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 
                         if (ip_summed == CHECKSUM_COMPLETE) {
                                 void *va = skb_frag_address(skb_shinfo(gro_skb)->frags);
-                                if (check_csum(cqe, gro_skb, va, ring->hwtstamp_rx_filter)) {
+                                if (check_csum(cqe, gro_skb, va,
+                                               dev->features)) {
                                         ip_summed = CHECKSUM_NONE;
                                         ring->csum_none++;
                                         ring->csum_complete--;
@@ -956,7 +951,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
                 }
 
                 if (ip_summed == CHECKSUM_COMPLETE) {
-                        if (check_csum(cqe, skb, skb->data, ring->hwtstamp_rx_filter)) {
+                        if (check_csum(cqe, skb, skb->data, dev->features)) {
                                 ip_summed = CHECKSUM_NONE;
                                 ring->csum_complete--;
                                 ring->csum_none++;