[PATCH net-next 2/6] qede: GSO support for tunnels with outer csum

[Yuval Mintz]

From: Manish Chopra <manish.cho...@caviumnetworks.com>

This patch adds GSO support for GRE and UDP tunnels
where outer checksums are enabled.

Signed-off-by: Manish Chopra <manish.cho...@caviumnetworks.com>
Signed-off-by: Yuval Mintz <yuval.mi...@caviumnetworks.com>
---
 drivers/net/ethernet/qlogic/qede/qede.h      |  1 +
 drivers/net/ethernet/qlogic/qede/qede_main.c | 26 +++++++++++++++++++++++---
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede.h 
b/drivers/net/ethernet/qlogic/qede/qede.h
index 28c0e9f..f50e527 100644
--- a/drivers/net/ethernet/qlogic/qede/qede.h
+++ b/drivers/net/ethernet/qlogic/qede/qede.h
@@ -320,6 +320,7 @@ struct qede_fastpath {
 #define XMIT_L4_CSUM           BIT(0)
 #define XMIT_LSO               BIT(1)
 #define XMIT_ENC               BIT(2)
+#define XMIT_ENC_GSO_L4_CSUM   BIT(3)
 
 #define QEDE_CSUM_ERROR                        BIT(0)
 #define QEDE_CSUM_UNNECESSARY          BIT(1)
diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c 
b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 9866d95..7d5dc1e 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -400,8 +400,19 @@ static u32 qede_xmit_type(struct qede_dev *edev,
            (ipv6_hdr(skb)->nexthdr == NEXTHDR_IPV6))
                *ipv6_ext = 1;
 
-       if (skb->encapsulation)
+       if (skb->encapsulation) {
                rc |= XMIT_ENC;
+               if (skb_is_gso(skb)) {
+                       unsigned short gso_type = skb_shinfo(skb)->gso_type;
+
+                       if ((gso_type & SKB_GSO_UDP_TUNNEL_CSUM) ||
+                           (gso_type & SKB_GSO_GRE_CSUM))
+                               rc |= XMIT_ENC_GSO_L4_CSUM;
+
+                       rc |= XMIT_LSO;
+                       return rc;
+               }
+       }
 
        if (skb_is_gso(skb))
                rc |= XMIT_LSO;
@@ -637,6 +648,12 @@ static netdev_tx_t qede_start_xmit(struct sk_buff *skb,
                if (unlikely(xmit_type & XMIT_ENC)) {
                        first_bd->data.bd_flags.bitfields |=
                                1 << ETH_TX_1ST_BD_FLAGS_TUNN_IP_CSUM_SHIFT;
+
+                       if (xmit_type & XMIT_ENC_GSO_L4_CSUM) {
+                               u8 tmp = ETH_TX_1ST_BD_FLAGS_TUNN_L4_CSUM_SHIFT;
+
+                               first_bd->data.bd_flags.bitfields |= 1 << tmp;
+                       }
                        hlen = qede_get_skb_hlen(skb, true);
                } else {
                        first_bd->data.bd_flags.bitfields |=
@@ -2320,11 +2337,14 @@ static void qede_init_ndev(struct qede_dev *edev)
 
        /* Encap features*/
        hw_features |= NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL |
-                      NETIF_F_TSO_ECN;
+                      NETIF_F_TSO_ECN | NETIF_F_GSO_UDP_TUNNEL_CSUM |
+                      NETIF_F_GSO_GRE_CSUM;
        ndev->hw_enc_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                                NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO_ECN |
                                NETIF_F_TSO6 | NETIF_F_GSO_GRE |
-                               NETIF_F_GSO_UDP_TUNNEL | NETIF_F_RXCSUM;
+                               NETIF_F_GSO_UDP_TUNNEL | NETIF_F_RXCSUM |
+                               NETIF_F_GSO_UDP_TUNNEL_CSUM |
+                               NETIF_F_GSO_GRE_CSUM;
 
        ndev->vlan_features = hw_features | NETIF_F_RXHASH | NETIF_F_RXCSUM |
                              NETIF_F_HIGHDMA;
-- 
1.9.3