Driver: Vmxnet3: Copy TCP header to mapped frame for IPv6 packets

Allows for packet parsing to be done by the fast path. This performance
optimization already exists for IPv4. Add similar logic for IPv6.
Signed-off-by: NAmitabha Banerjee <banerjeea@vmware.com>
Signed-off-by: NShrikrishna Khare <skhare@vmware.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/vmxnet3/vmxnet3_drv.c

@@ -819,6 +819,7 @@ vmxnet3_parse_and_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 			   struct vmxnet3_adapter *adapter)
 {
 	struct Vmxnet3_TxDataDesc *tdd;
+	u8 protocol = 0;
 
 	if (ctx->mss) {	/* TSO */
 		ctx->eth_ip_hdr_size = skb_transport_offset(skb);
@@ -831,16 +832,25 @@ vmxnet3_parse_and_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 			if (ctx->ipv4) {
 				const struct iphdr *iph = ip_hdr(skb);
 
-				if (iph->protocol == IPPROTO_TCP)
-					ctx->l4_hdr_size = tcp_hdrlen(skb);
-				else if (iph->protocol == IPPROTO_UDP)
-					ctx->l4_hdr_size = sizeof(struct udphdr);
-				else
-					ctx->l4_hdr_size = 0;
-			} else {
-				/* for simplicity, don't copy L4 headers */
+				protocol = iph->protocol;
+			} else if (ctx->ipv6) {
+				const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
+				protocol = ipv6h->nexthdr;
+			}
+
+			switch (protocol) {
+			case IPPROTO_TCP:
+				ctx->l4_hdr_size = tcp_hdrlen(skb);
+				break;
+			case IPPROTO_UDP:
+				ctx->l4_hdr_size = sizeof(struct udphdr);
+				break;
+			default:
 				ctx->l4_hdr_size = 0;
+				break;
 			}
+
 			ctx->copy_size = min(ctx->eth_ip_hdr_size +
 					 ctx->l4_hdr_size, skb->len);
 		} else {
@@ -887,7 +897,7 @@ vmxnet3_prepare_tso(struct sk_buff *skb,
 		iph->check = 0;
 		tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, 0,
 						 IPPROTO_TCP, 0);
-	} else {
+	} else if (ctx->ipv6) {
 		struct ipv6hdr *iph = ipv6_hdr(skb);
 
 		tcph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, 0,
@@ -938,6 +948,7 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 	count = txd_estimate(skb);
 
 	ctx.ipv4 = (vlan_get_protocol(skb) == cpu_to_be16(ETH_P_IP));
+	ctx.ipv6 = (vlan_get_protocol(skb) == cpu_to_be16(ETH_P_IPV6));
 
 	ctx.mss = skb_shinfo(skb)->gso_size;
 	if (ctx.mss) {

drivers/net/vmxnet3/vmxnet3_int.h

@@ -69,10 +69,10 @@
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.3.4.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.3.5.0-k"
 
 /* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01030400
+#define VMXNET3_DRIVER_VERSION_NUM      0x01030500
 
 #if defined(CONFIG_PCI_MSI)
 	/* RSS only makes sense if MSI-X is supported. */
@@ -211,6 +211,7 @@ struct vmxnet3_tq_driver_stats {
 
 struct vmxnet3_tx_ctx {
 	bool   ipv4;
+	bool   ipv6;
 	u16 mss;
 	u32 eth_ip_hdr_size; /* only valid for pkts requesting tso or csum
 				 * offloading