hv_netvsc: Fix IP header checksum for coalesced packets

[ Upstream commit bf48648d650db1146b75b9bd358502431e86cf4f ]

Incoming packets may have IP header checksum verified by the host.
They may not have IP header checksum computed after coalescing.
This patch re-compute the checksum when necessary, otherwise the
packets may be dropped, because Linux network stack always checks it.
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/hyperv/netvsc_drv.c

@@ -743,6 +743,14 @@ void netvsc_linkstatus_callback(struct net_device *net,
 	schedule_delayed_work(&ndev_ctx->dwork, 0);
 }
 
+static void netvsc_comp_ipcsum(struct sk_buff *skb)
+{
+	struct iphdr *iph = (struct iphdr *)skb->data;
+
+	iph->check = 0;
+	iph->check = ip_fast_csum(iph, iph->ihl);
+}
+
 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 					     struct napi_struct *napi,
 					     const struct ndis_tcp_ip_checksum_info *csum_info,
@@ -766,9 +774,17 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 	/* skb is already created with CHECKSUM_NONE */
 	skb_checksum_none_assert(skb);
 
-	/*
-	 * In Linux, the IP checksum is always checked.
-	 * Do L4 checksum offload if enabled and present.
+	/* Incoming packets may have IP header checksum verified by the host.
+	 * They may not have IP header checksum computed after coalescing.
+	 * We compute it here if the flags are set, because on Linux, the IP
+	 * checksum is always checked.
+	 */
+	if (csum_info && csum_info->receive.ip_checksum_value_invalid &&
+	    csum_info->receive.ip_checksum_succeeded &&
+	    skb->protocol == htons(ETH_P_IP))
+		netvsc_comp_ipcsum(skb);
+
+	/* Do L4 checksum offload if enabled and present.
 	 */
 	if (csum_info && (net->features & NETIF_F_RXCSUM)) {
 		if (csum_info->receive.tcp_checksum_succeeded ||