netdev - [net-next 13/15] ixgbe: Handle extended IPv6 headers in tx path

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Date:	Wed,  2 Dec 2015 04:31:06 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Mark Rustad <mark.d.rustad@...el.com>, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 13/15] ixgbe: Handle extended IPv6 headers in tx path

From: Mark Rustad <mark.d.rustad@...el.com>

Check for and handle IPv6 extended headers so that Tx checksum
offload can be done. Thanks to Tom Herbert for noticing this
problem. Note that the goto back to process the final protocol
value can never result in a loop, because it cannot be yet
another extended header. Handling them in this manner avoids
adding further checks to the non-extended header hot path.

Reported-by: Tom Herbert <tom@...bertland.com>
Signed-off-by: Mark Rustad <mark.d.rustad@...el.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index a10a0fa..b7f1133 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7095,6 +7095,7 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
 			}
 		}
 
+again:
 		switch (l4_hdr) {
 		case IPPROTO_TCP:
 			type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
@@ -7111,7 +7112,23 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
 					IXGBE_ADVTXD_L4LEN_SHIFT;
 			break;
 		default:
-			if (unlikely(net_ratelimit())) {
+			if (network_hdr.ipv4->version == 6 &&
+			    ipv6_ext_hdr(l4_hdr)) {
+				unsigned int offset = 0;
+				int ret;
+
+				ret = ipv6_find_hdr(skb, &offset, -1, NULL,
+						    NULL);
+				if (ret > 0) {
+					l4_hdr = ret;
+					goto again;
+				}
+				if (unlikely(net_ratelimit())) {
+					dev_warn(tx_ring->dev,
+						 "ipv6_find_hdr returned %d\n",
+						 ret);
+				}
+			} else if (unlikely(net_ratelimit())) {
 				dev_warn(tx_ring->dev,
 				 "partial checksum but l4 proto=%x!\n",
 				 l4_hdr);
-- 
2.5.0

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