netdev - [PATCH net-next 5/6] net: ixgbe: use skb_csum_is

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Message-Id: <f58d50ef96eb1504f4a952cc75a19d21dcf85827.1610777159.git.lucien.xin@gmail.com>
Date:   Sat, 16 Jan 2021 14:13:41 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        intel-wired-lan@...ts.osuosl.org
Subject: [PATCH net-next 5/6] net: ixgbe: 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 ixgbe 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@...il.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 6cbbe09..2973c54 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8040,15 +8040,6 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	return 1;
 }
 
-static inline bool ixgbe_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 ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
 			  struct ixgbe_tx_buffer *first,
 			  struct ixgbe_ipsec_tx_data *itd)
@@ -8074,10 +8065,7 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
 		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)) &&
-		     ixgbe_ipv6_csum_is_sctp(skb))) {
+		if (skb_csum_is_sctp(skb)) {
 			type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_SCTP;
 			break;
 		}
-- 
2.1.0