fix mvneta vlan tagging

This is a 3.14.x backport of:
"mvneta: Fix TSO and checksum for non-acceleration vlan traffic"

Upstream commits:

817dbfa5d1bc276a72c1a577310382008e8aca0a
2d39d120781a5770573dc6ed672a5a562f541aea

Fixes vlan tagging on SoC interfaces for the WRT1900AC.  Useful
when using mvsw6171 driver.

Signed-off-by: Mark Milburn <mark.a.milburn@gmail.com>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
SVN-Revision: 43781

diff --git a/target/linux/mvebu/patches-3.14/110-mvneta_fix_tso_and_chksum.patch b/target/linux/mvebu/patches-3.14/110-mvneta_fix_tso_and_chksum.patch
new file mode 100644 (file)
index 0000000..7115468
--- /dev/null
+++ b/target/linux/mvebu/patches-3.14/110-mvneta_fix_tso_and_chksum.patch
@@ -0,0 +1,38 @@
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -20,6 +20,7 @@
+ #include <linux/mbus.h>
+ #include <linux/module.h>
+ #include <linux/interrupt.h>
++#include <linux/if_vlan.h>
+ #include <net/ip.h>
+ #include <net/ipv6.h>
+ #include <linux/io.h>
+@@ -1380,15 +1381,16 @@ static u32 mvneta_skb_tx_csum(struct mvn
+ {
+       if (skb->ip_summed == CHECKSUM_PARTIAL) {
+               int ip_hdr_len = 0;
++              __be16 l3_proto = vlan_get_protocol(skb);
+               u8 l4_proto;
+ 
+-              if (skb->protocol == htons(ETH_P_IP)) {
++              if (l3_proto == htons(ETH_P_IP)) {
+                       struct iphdr *ip4h = ip_hdr(skb);
+ 
+                       /* Calculate IPv4 checksum and L4 checksum */
+                       ip_hdr_len = ip4h->ihl;
+                       l4_proto = ip4h->protocol;
+-              } else if (skb->protocol == htons(ETH_P_IPV6)) {
++              } else if (l3_proto == htons(ETH_P_IPV6)) {
+                       struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ 
+                       /* Read l4_protocol from one of IPv6 extra headers */
+@@ -1399,7 +1401,7 @@ static u32 mvneta_skb_tx_csum(struct mvn
+                       return MVNETA_TX_L4_CSUM_NOT;
+ 
+               return mvneta_txq_desc_csum(skb_network_offset(skb),
+-                              skb->protocol, ip_hdr_len, l4_proto);
++                                      l3_proto, ip_hdr_len, l4_proto);
+       }
+ 
+       return MVNETA_TX_L4_CSUM_NOT;