net: hns3: Updates RX packet info fetch in case of multi BD

BugLink: https://bugs.launchpad.net/bugs/1787477
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>
(cherry picked from commit 846fcc83638f8908a465583fa93f4d6f14161420)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index f2b31d278bc9b9bb45080e6a044d304472f86e81..50750adad193b6fdf3a96556b09c7f61fb192334 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2240,6 +2240,23 @@ static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
        }
 
        *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);
 
        l234info = le32_to_cpu(desc->rx.l234_info);