From: Peng Li <lipeng321@huawei.com>
Date: Fri, 25 May 2018 19:42:56 +0100
Subject: net: hns3: Updates RX packet info fetch in case of multi BD
Patch-mainline: v4.18-rc1
Git-commit: 846fcc83638f8908a465583fa93f4d6f14161420
References: bsc#1104353 FATE#326415

In the latest revision of the hardware, if a packet is spanning
across multiple BDs then only VLD bit and current data size info
is valid in each BD, and rest of the information is only valid
in the last BD of the packet. In such case we should make sure
we are fetching RX packet size from the first descriptor and
information like VLAN should be fetched from last BD.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Reviewed-by: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |   36 ++++++++++++------------
 1 file changed, 18 insertions(+), 18 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2063,9 +2063,8 @@ static int hns3_handle_rx_bd(struct hns3
 
 	prefetch(desc);
 
-	length = le16_to_cpu(desc->rx.pkt_len);
+	length = le16_to_cpu(desc->rx.size);
 	bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
-	l234info = le32_to_cpu(desc->rx.l234_info);
 
 	/* Check valid BD */
 	if (!hnae_get_bit(bd_base_info, HNS3_RXD_VLD_B))
@@ -2099,22 +2098,6 @@ static int hns3_handle_rx_bd(struct hns3
 
 	prefetchw(skb->data);
 
-	/* Based on hw strategy, the tag offloaded will be stored at
-	 * ot_vlan_tag in two layer tag case, and stored at vlan_tag
-	 * in one layer tag case.
-	 */
-	if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
-		u16 vlan_tag;
-
-		vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
-		if (!(vlan_tag & VLAN_VID_MASK))
-			vlan_tag = le16_to_cpu(desc->rx.vlan_tag);
-		if (vlan_tag & VLAN_VID_MASK)
-			__vlan_hwaccel_put_tag(skb,
-					       htons(ETH_P_8021Q),
-					       vlan_tag);
-	}
-
 	bnum = 1;
 	if (length <= HNS3_RX_HEAD_SIZE) {
 		memcpy(__skb_put(skb, length), va, ALIGN(length, sizeof(long)));
@@ -2150,6 +2133,23 @@ static int hns3_handle_rx_bd(struct hns3
 	}
 
 	*out_bnum = bnum;
+	/* Based on hw strategy, the tag offloaded will be stored at
+	 * ot_vlan_tag in two layer tag case, and stored at vlan_tag
+	 * in one layer tag case.
+	 */
+	if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
+		u16 vlan_tag;
+
+		vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
+		if (!(vlan_tag & VLAN_VID_MASK))
+			vlan_tag = le16_to_cpu(desc->rx.vlan_tag);
+		if (vlan_tag & VLAN_VID_MASK)
+			__vlan_hwaccel_put_tag(skb,
+					       htons(ETH_P_8021Q),
+					       vlan_tag);
+	}
+
+	l234info = le32_to_cpu(desc->rx.l234_info);
 
 	if (unlikely(!hnae_get_bit(bd_base_info, HNS3_RXD_VLD_B))) {
 		netdev_err(netdev, "no valid bd,%016llx,%016llx\n",