net: mana: Add support for vlan tagging

BugLink: https://bugs.launchpad.net/bugs/2023695

To support vlan, use MANA_LONG_PKT_FMT if vlan tag is present in TX
skb. Then extract the vlan tag from the skb struct, and save it to
tx_oob for the NIC to transmit. For vlan tags on the payload, they
are accepted by the NIC too.

For RX, extract the vlan tag from CQE and put it into skb.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(backported from commit b803d1f linux-next)
[rtg - context adjustments due to missing XDP features]
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Andrei Gherzan <andrei.gherzan@canonical.com>
Acked-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

Author: haiyangz

drivers/net/ethernet/microsoft/mana/mana_en.c

@@ -164,6 +164,14 @@ int mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 		pkg.tx_oob.s_oob.short_vp_offset = txq->vp_offset;
 	}
 
+	if (skb_vlan_tag_present(skb)) {
+		pkt_fmt = MANA_LONG_PKT_FMT;
+		pkg.tx_oob.l_oob.inject_vlan_pri_tag = 1;
+		pkg.tx_oob.l_oob.pcp = skb_vlan_tag_get_prio(skb);
+		pkg.tx_oob.l_oob.dei = skb_vlan_tag_get_cfi(skb);
+		pkg.tx_oob.l_oob.vlan_id = skb_vlan_tag_get_id(skb);
+	}
+
 	pkg.tx_oob.s_oob.pkt_fmt = pkt_fmt;
 
 	if (pkt_fmt == MANA_SHORT_PKT_FMT)
@@ -1356,6 +1364,12 @@ static void mana_rx_skb(void *buf_va, struct mana_rxcomp_oob *cqe,
 			skb_set_hash(skb, hash_value, PKT_HASH_TYPE_L3);
 	}
 
+	if (cqe->rx_vlantag_present) {
+		u16 vlan_tci = cqe->rx_vlan_id;
+
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
+	}
+
 	u64_stats_update_begin(&rx_stats->syncp);
 	rx_stats->packets++;
 	rx_stats->bytes += pkt_len;
@@ -2338,8 +2352,9 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
 	ndev->hw_features |= NETIF_F_RXCSUM;
 	ndev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
 	ndev->hw_features |= NETIF_F_RXHASH;
-	ndev->features = ndev->hw_features;
-	ndev->vlan_features = 0;
+	ndev->features = ndev->hw_features | NETIF_F_HW_VLAN_CTAG_TX |
+			 NETIF_F_HW_VLAN_CTAG_RX;
+	ndev->vlan_features = ndev->features;
 
 	err = register_netdev(ndev);
 	if (err) {