net/mlx4_en: Add support for inner IPv6 checksum offloads and TSO

>From what I can tell the ConnectX-3 will support an inner IPv6 checksum and
segmentation offload, however it cannot support outer IPv6 headers.  This
assumption is based on the fact that I could see the checksum being
offloaded for inner header on IPv4 tunnels, but not on IPv6 tunnels.

For this reason I am adding the feature to the hw_enc_features and adding
an extra check to the features_check call that will disable GSO and
checksum offload in the case that the encapsulated frame has an outer IP
version of that is not 4.  The check in mlx4_en_features_check could be
removed if at some point in the future a fix is found that allows the
hardware to offload segmentation/checksum on tunnels with an outer IPv6
header.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index bce37cb..6f28ac5 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2357,8 +2357,10 @@ out:
        }
 
        /* set offloads */
-       priv->dev->hw_enc_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
-                                     NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL |
+       priv->dev->hw_enc_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+                                     NETIF_F_RXCSUM |
+                                     NETIF_F_TSO | NETIF_F_TSO6 |
+                                     NETIF_F_GSO_UDP_TUNNEL |
                                      NETIF_F_GSO_UDP_TUNNEL_CSUM |
                                      NETIF_F_GSO_PARTIAL;
 }
@@ -2369,8 +2371,10 @@ static void mlx4_en_del_vxlan_offloads(struct work_struct *work)
        struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
                                                 vxlan_del_task);
        /* unset offloads */
-       priv->dev->hw_enc_features &= ~(NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
-                                       NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL |
+       priv->dev->hw_enc_features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+                                       NETIF_F_RXCSUM |
+                                       NETIF_F_TSO | NETIF_F_TSO6 |
+                                       NETIF_F_GSO_UDP_TUNNEL |
                                        NETIF_F_GSO_UDP_TUNNEL_CSUM |
                                        NETIF_F_GSO_PARTIAL);
 
@@ -2431,7 +2435,18 @@ static netdev_features_t mlx4_en_features_check(struct sk_buff *skb,
                                                netdev_features_t features)
 {
        features = vlan_features_check(skb, features);
-       return vxlan_features_check(skb, features);
+       features = vxlan_features_check(skb, features);
+
+       /* The ConnectX-3 doesn't support outer IPv6 checksums but it does
+        * support inner IPv6 checksums and segmentation so  we need to
+        * strip that feature if this is an IPv6 encapsulated frame.
+        */
+       if (skb->encapsulation &&
+           (skb->ip_summed == CHECKSUM_PARTIAL) &&
+           (ip_hdr(skb)->version != 4))
+               features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
+
+       return features;
 }
 #endif
 

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index a386f04..0f206a9 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -41,6 +41,7 @@
 #include <linux/vmalloc.h>
 #include <linux/tcp.h>
 #include <linux/ip.h>
+#include <linux/ipv6.h>
 #include <linux/moduleparam.h>
 
 #include "mlx4_en.h"
@@ -920,8 +921,18 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
                                 tx_ind, fragptr);
 
        if (skb->encapsulation) {
-               struct iphdr *ipv4 = (struct iphdr *)skb_inner_network_header(skb);
-               if (ipv4->protocol == IPPROTO_TCP || ipv4->protocol == IPPROTO_UDP)
+               union {
+                       struct iphdr *v4;
+                       struct ipv6hdr *v6;
+                       unsigned char *hdr;
+               } ip;
+               u8 proto;
+
+               ip.hdr = skb_inner_network_header(skb);
+               proto = (ip.v4->version == 4) ? ip.v4->protocol :
+                                               ip.v6->nexthdr;
+
+               if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
                        op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP);
                else
                        op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP);