net: igc: use skb_csum_is_sctp instead of protocol check

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

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index afd6a62..43aec42 100644 (file)
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -949,15 +949,6 @@ static void igc_tx_ctxtdesc(struct igc_ring *tx_ring,
        }
 }
 
-static inline bool igc_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 void igc_tx_csum(struct igc_ring *tx_ring, struct igc_tx_buffer *first)
 {
        struct sk_buff *skb = first->skb;
@@ -980,10 +971,7 @@ csum_failed:
                break;
        case offsetof(struct sctphdr, checksum):
                /* validate that this is actually an SCTP request */
-               if ((first->protocol == htons(ETH_P_IP) &&
-                    (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
-                   (first->protocol == htons(ETH_P_IPV6) &&
-                    igc_ipv6_csum_is_sctp(skb))) {
+               if (skb_csum_is_sctp(skb)) {
                        type_tucmd = IGC_ADVTXD_TUCMD_L4T_SCTP;
                        break;
                }