From: Ronak Doshi <doshir@vmware.com>
Date: Thu, 28 May 2020 19:53:52 -0700
Subject: vmxnet3: use correct hdr reference when packet is encapsulated
Patch-mainline: v5.8-rc1
Git-commit: 36432797641ff0013be9252eecf7ad1ba73171a2
References: bsc#1172484

'Commit dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload
support")' added support for encapsulation offload. However, while
preparing inner tso packet, it uses reference to outer ip headers.

This patch fixes this issue by using correct reference for inner
headers.

Fixes: dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload support")
Signed-off-by: Ronak Doshi <doshir@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/vmxnet3/vmxnet3_drv.c |   35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -860,14 +860,29 @@ vmxnet3_parse_hdr(struct sk_buff *skb, s
 			 */
 			ctx->l4_offset = skb_checksum_start_offset(skb);
 
-			if (ctx->ipv4) {
-				const struct iphdr *iph = ip_hdr(skb);
-
-				protocol = iph->protocol;
-			} else if (ctx->ipv6) {
-				const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
-
-				protocol = ipv6h->nexthdr;
+			if (VMXNET3_VERSION_GE_4(adapter) &&
+			    skb->encapsulation) {
+				struct iphdr *iph = inner_ip_hdr(skb);
+
+				if (iph->version == 4) {
+					protocol = iph->protocol;
+				} else {
+					const struct ipv6hdr *ipv6h;
+
+					ipv6h = inner_ipv6_hdr(skb);
+					protocol = ipv6h->nexthdr;
+				}
+			} else {
+				if (ctx->ipv4) {
+					const struct iphdr *iph = ip_hdr(skb);
+
+					protocol = iph->protocol;
+				} else if (ctx->ipv6) {
+					const struct ipv6hdr *ipv6h;
+
+					ipv6h = ipv6_hdr(skb);
+					protocol = ipv6h->nexthdr;
+				}
 			}
 
 			switch (protocol) {
@@ -947,11 +962,11 @@ vmxnet3_prepare_inner_tso(struct sk_buff
 	struct tcphdr *tcph = inner_tcp_hdr(skb);
 	struct iphdr *iph = inner_ip_hdr(skb);
 
-	if (ctx->ipv4) {
+	if (iph->version == 4) {
 		iph->check = 0;
 		tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, 0,
 						 IPPROTO_TCP, 0);
-	} else if (ctx->ipv6) {
+	} else {
 		struct ipv6hdr *iph = inner_ipv6_hdr(skb);
 
 		tcph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, 0,