net: hns3: Add STRP_TAGP field support for hardware revision 0x21

Hardware Revision(0x21) Buffer Descriptor adds a field STRP_TAGP
for vlan stripped processed indication. STRP_TAGP field has 2 bits,
bit 0 is stripped indication of the vlan tag in outer vlan tag
field, bit 1 is stripped indication of the vlan tag in inner vlan
tag field. For each bit, 0 indicates the tag is not stripped and
1 indicates the tag is stripped.

This patch adds STRP_TAGP support for revision(0x21), and does not
change the revision(0x20) action.
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -2066,6 +2066,39 @@ static void hns3_rx_skb(struct hns3_enet_ring *ring, struct sk_buff *skb)
 	napi_gro_receive(&ring->tqp_vector->napi, skb);
 }
 
+static u16 hns3_parse_vlan_tag(struct hns3_enet_ring *ring,
+			       struct hns3_desc *desc, u32 l234info)
+{
+	struct pci_dev *pdev = ring->tqp->handle->pdev;
+	u16 vlan_tag;
+
+	if (pdev->revision == 0x20) {
+		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);
+
+		return vlan_tag;
+	}
+
+#define HNS3_STRP_OUTER_VLAN	0x1
+#define HNS3_STRP_INNER_VLAN	0x2
+
+	switch (hnae_get_field(l234info, HNS3_RXD_STRP_TAGP_M,
+			       HNS3_RXD_STRP_TAGP_S)) {
+	case HNS3_STRP_OUTER_VLAN:
+		vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
+		break;
+	case HNS3_STRP_INNER_VLAN:
+		vlan_tag = le16_to_cpu(desc->rx.vlan_tag);
+		break;
+	default:
+		vlan_tag = 0;
+		break;
+	}
+
+	return vlan_tag;
+}
+
 static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
 			     struct sk_buff **out_skb, int *out_bnum)
 {
@@ -2155,6 +2188,9 @@ static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
 	}
 
 	*out_bnum = bnum;
+
+	l234info = le32_to_cpu(desc->rx.l234_info);
+
 	/* 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.
@@ -2162,17 +2198,13 @@ static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
 	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);
+		vlan_tag = hns3_parse_vlan_tag(ring, desc, l234info);
 		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",
 			   ((u64 *)desc)[0], ((u64 *)desc)[1]);

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

@@ -104,6 +104,9 @@ enum hns3_nic_state {
 #define HNS3_RXD_L4ID_S				8
 #define HNS3_RXD_L4ID_M				(0xf << HNS3_RXD_L4ID_S)
 #define HNS3_RXD_FRAG_B				12
+#define HNS3_RXD_STRP_TAGP_S			13
+#define HNS3_RXD_STRP_TAGP_M			(0x3 << HNS3_RXD_STRP_TAGP_S)
+
 #define HNS3_RXD_L2E_B				16
 #define HNS3_RXD_L3E_B				17
 #define HNS3_RXD_L4E_B				18