[PATCH net-next 3/6] net: igbvf: use skb_csum_is_sctp instead of protocol check

[Xin Long]

Using skb_csum_is_sctp is a easier way to validate it's a SCTP CRC
checksum offload packet, and yet it also makes igbvf support SCTP
CRC checksum offload for UDP and GRE encapped packets, just as it
does in igb driver.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 drivers/net/ethernet/intel/igbvf/netdev.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c 
b/drivers/net/ethernet/intel/igbvf/netdev.c
index 30fdea2..fb3fbcb 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2072,15 +2072,6 @@ static int igbvf_tso(struct igbvf_ring *tx_ring,
        return 1;
 }
 
-static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
-{
-       unsigned int offset = 0;
-
-       ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
-
-       return offset == skb_checksum_start_offset(skb);
-}
-
 static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, struct sk_buff *skb,
                          u32 tx_flags, __be16 protocol)
 {
@@ -2102,10 +2093,7 @@ static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, 
struct sk_buff *skb,
                break;
        case offsetof(struct sctphdr, checksum):
                /* validate that this is actually an SCTP request */
-               if (((protocol == htons(ETH_P_IP)) &&
-                    (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
-                   ((protocol == htons(ETH_P_IPV6)) &&
-                    igbvf_ipv6_csum_is_sctp(skb))) {
+               if (skb_csum_is_sctp(skb)) {
                        type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
                        break;
                }
-- 
2.1.0