diff mbox

[3/8] bna: Support TSO and partial checksum with non-accelerated vlans.

Message ID 1408760230-7457-4-git-send-email-vysevich@gmail.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Vladislav Yasevich Aug. 23, 2014, 2:17 a.m. UTC 
From: Vladislav Yasevich <vyasevic@redhat.com>

This device claims TSO and checksum support for vlans.  It also
allows a user to control vlan acceleration offloading.  As such,
it is possible to turn off vlan acceleration and configure a vlan
which will continue to support TSO.

In such situation the packet passed down the the device will contain
a vlan header and skb->protocol will be set to ETH_P_8021Q.
The device assumes that skb->protocol contains network protocol
value and uses that value to set up TSO information.  This results
in corrupted frames sent on the wire.

This patch extract the protocol value correctly and corrects TSO
and checksums for non-accelerated traffic.

CC: Rasesh Mody <rmody@brocade.com>
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
---
 drivers/net/ethernet/brocade/bna/bnad.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index ff8cae5..ffc92a4 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -2506,7 +2506,7 @@  bnad_tso_prepare(struct bnad *bnad, struct sk_buff *skb)
 	 * For TSO, the TCP checksum field is seeded with pseudo-header sum
 	 * excluding the length field.
 	 */
-	if (skb->protocol == htons(ETH_P_IP)) {
+	if (vlan_get_protocol(skb) == htons(ETH_P_IP)) {
 		struct iphdr *iph = ip_hdr(skb);
 
 		/* Do we really need these? */
@@ -2870,12 +2870,13 @@  bnad_txq_wi_prepare(struct bnad *bnad, struct bna_tcb *tcb,
 		}
 
 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
+			__be16 net_proto = vlan_get_protocol(skb);
 			u8 proto = 0;
 
-			if (skb->protocol == htons(ETH_P_IP))
+			if (net_proto == htons(ETH_P_IP))
 				proto = ip_hdr(skb)->protocol;
 #ifdef NETIF_F_IPV6_CSUM
-			else if (skb->protocol == htons(ETH_P_IPV6)) {
+			else if (net_proto == htons(ETH_P_IPV6)) {
 				/* nexthdr may not be TCP immediately. */
 				proto = ipv6_hdr(skb)->nexthdr;
 			}