nfp: fix incorrectly set csum flag for nfdk path

The csum flag of IPsec packet are set repeatedly. Therefore, the csum
flag set of IPsec and non-IPsec packet need to be distinguished.

As the ipv6 header does not have a csum field, so l3-csum flag is not
required to be set for ipv6 case.

Fixes: 436396f2 ("nfp: support IPsec offloading for NFP3800")
Signed-off-by: Huanhuan Wang <huanhuan.wang@corigine.com>
Reviewed-by: Louis Peens <louis.peens@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfdk/dp.c

@@ -387,7 +387,8 @@ netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
 	if (!skb_is_gso(skb)) {
 		real_len = skb->len;
 		/* Metadata desc */
-		metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
+		if (!ipsec)
+			metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
 		txd->raw = cpu_to_le64(metadata);
 		txd++;
 	} else {
@@ -395,7 +396,8 @@ netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
 		(txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);
 		real_len = txbuf->real_len;
 		/* Metadata desc */
-		metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
+		if (!ipsec)
+			metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
 		txd->raw = cpu_to_le64(metadata);
 		txd += 2;
 		txbuf++;

drivers/net/ethernet/netronome/nfp/nfdk/ipsec.c

@@ -9,9 +9,13 @@
 u64 nfp_nfdk_ipsec_tx(u64 flags, struct sk_buff *skb)
 {
 	struct xfrm_state *x = xfrm_input_state(skb);
+	struct iphdr *iph = ip_hdr(skb);
 
-	if (x->xso.dev && (x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM))
-		flags |= NFDK_DESC_TX_L3_CSUM | NFDK_DESC_TX_L4_CSUM;
+	if (x->xso.dev && (x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)) {
+		if (iph->version == 4)
+			flags |= NFDK_DESC_TX_L3_CSUM;
+		flags |= NFDK_DESC_TX_L4_CSUM;
+	}
 
 	return flags;
 }