[PATCH 5.10 097/125] vmxnet3: fix cksum offload issues for tunnels with non-default udp ports

[Greg Kroah-Hartman]

From: Ronak Doshi <doshir@xxxxxxxxxx>

commit b22580233d473dbf7bbfa4f6549c09e2c80e9e64 upstream.

Commit dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload
support") added support for encapsulation offload. However, the inner
offload capability is to be restricted to UDP tunnels with default
Vxlan and Geneve ports.

This patch fixes the issue for tunnels with non-default ports using
features check capability and filtering appropriate features for such
tunnels.

Fixes: dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload support")
Signed-off-by: Ronak Doshi <doshir@xxxxxxxxxx>
Acked-by: Guolin Yang <gyang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/vmxnet3/vmxnet3_ethtool.c |   22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -1,7 +1,7 @@
 /*
  * Linux driver for VMware's vmxnet3 ethernet NIC.
  *
- * Copyright (C) 2008-2020, VMware, Inc. All Rights Reserved.
+ * Copyright (C) 2008-2021, VMware, Inc. All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -26,6 +26,10 @@
 
 
 #include "vmxnet3_int.h"
+#include <net/vxlan.h>
+#include <net/geneve.h>
+
+#define VXLAN_UDP_PORT 8472
 
 struct vmxnet3_stat_desc {
 	char desc[ETH_GSTRING_LEN];
@@ -277,6 +281,8 @@ netdev_features_t vmxnet3_features_check
 	if (VMXNET3_VERSION_GE_4(adapter) &&
 	    skb->encapsulation && skb->ip_summed == CHECKSUM_PARTIAL) {
 		u8 l4_proto = 0;
+		u16 port;
+		struct udphdr *udph;
 
 		switch (vlan_get_protocol(skb)) {
 		case htons(ETH_P_IP):
@@ -289,8 +295,20 @@ netdev_features_t vmxnet3_features_check
 			return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 		}
 
-		if (l4_proto != IPPROTO_UDP)
+		switch (l4_proto) {
+		case IPPROTO_UDP:
+			udph = udp_hdr(skb);
+			port = be16_to_cpu(udph->dest);
+			/* Check if offloaded port is supported */
+			if (port != GENEVE_UDP_PORT &&
+			    port != IANA_VXLAN_UDP_PORT &&
+			    port != VXLAN_UDP_PORT) {
+				return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
+			}
+			break;
+		default:
 			return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
+		}
 	}
 	return features;
 }