net: hns3: add handling vlan tag offload in bd

This patch deals with the vlan tag information between
sk_buff and rx/tx bd.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 78 insertions, 5 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 301b3296856e..320ae8892a68 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -723,6 +723,58 @@ static void hns3_set_txbd_baseinfo(u16 *bdtp_fe_sc_vld_ra_ri, int frag_end)
         hnae_set_field(*bdtp_fe_sc_vld_ra_ri, HNS3_TXD_SC_M, HNS3_TXD_SC_S, 0);
 }
 
+static int hns3_fill_desc_vtags(struct sk_buff *skb,
+                                struct hns3_enet_ring *tx_ring,
+                                u32 *inner_vlan_flag,
+                                u32 *out_vlan_flag,
+                                u16 *inner_vtag,
+                                u16 *out_vtag)
+{
+#define HNS3_TX_VLAN_PRIO_SHIFT 13
+
+        if (skb->protocol == htons(ETH_P_8021Q) &&
+            !(tx_ring->tqp->handle->kinfo.netdev->features &
+            NETIF_F_HW_VLAN_CTAG_TX)) {
+                /* When HW VLAN acceleration is turned off, and the stack
+                 * sets the protocol to 802.1q, the driver just need to
+                 * set the protocol to the encapsulated ethertype.
+                 */
+                skb->protocol = vlan_get_protocol(skb);
+                return 0;
+        }
+
+        if (skb_vlan_tag_present(skb)) {
+                u16 vlan_tag;
+
+                vlan_tag = skb_vlan_tag_get(skb);
+                vlan_tag |= (skb->priority & 0x7) << HNS3_TX_VLAN_PRIO_SHIFT;
+
+                /* Based on hw strategy, use out_vtag in two layer tag case,
+                 * and use inner_vtag in one tag case.
+                 */
+                if (skb->protocol == htons(ETH_P_8021Q)) {
+                        hnae_set_bit(*out_vlan_flag, HNS3_TXD_OVLAN_B, 1);
+                        *out_vtag = vlan_tag;
+                } else {
+                        hnae_set_bit(*inner_vlan_flag, HNS3_TXD_VLAN_B, 1);
+                        *inner_vtag = vlan_tag;
+                }
+        } else if (skb->protocol == htons(ETH_P_8021Q)) {
+                struct vlan_ethhdr *vhdr;
+                int rc;
+
+                rc = skb_cow_head(skb, 0);
+                if (rc < 0)
+                        return rc;
+                vhdr = (struct vlan_ethhdr *)skb->data;
+                vhdr->h_vlan_TCI |= cpu_to_be16((skb->priority & 0x7)
+                                        << HNS3_TX_VLAN_PRIO_SHIFT);
+        }
+
+        skb->protocol = vlan_get_protocol(skb);
+        return 0;
+}
+
 static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                           int size, dma_addr_t dma, int frag_end,
                           enum hns_desc_type type)
@@ -733,6 +785,8 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
         u16 bdtp_fe_sc_vld_ra_ri = 0;
         u32 type_cs_vlan_tso = 0;
         struct sk_buff *skb;
+        u16 inner_vtag = 0;
+        u16 out_vtag = 0;
         u32 paylen = 0;
         u16 mss = 0;
         __be16 protocol;
@@ -756,15 +810,16 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                 skb = (struct sk_buff *)priv;
                 paylen = skb->len;
 
+                ret = hns3_fill_desc_vtags(skb, ring, &type_cs_vlan_tso,
+                                           &ol_type_vlan_len_msec,
+                                           &inner_vtag, &out_vtag);
+                if (unlikely(ret))
+                        return ret;
+
                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
                         skb_reset_mac_len(skb);
                         protocol = skb->protocol;
 
-                        /* vlan packet*/
-                        if (protocol == htons(ETH_P_8021Q)) {
-                                protocol = vlan_get_protocol(skb);
-                                skb->protocol = protocol;
-                        }
                         ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
                         if (ret)
                                 return ret;
@@ -790,6 +845,8 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                         cpu_to_le32(type_cs_vlan_tso);
                 desc->tx.paylen = cpu_to_le32(paylen);
                 desc->tx.mss = cpu_to_le16(mss);
+                desc->tx.vlan_tag = cpu_to_le16(inner_vtag);
+                desc->tx.outer_vlan_tag = cpu_to_le16(out_vtag);
         }
 
         /* move ring pointer to next.*/
@@ -2101,6 +2158,22 @@ static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
 
         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)));