net: stmmac: selftests: Add selftest for VLAN TX Offload

Add 2 new selftests for VLAN Insertion offloading. Tests are for inner
and outer VLAN offloading.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c

@@ -296,7 +296,9 @@ static int __stmmac_test_loopback(struct stmmac_priv *priv,
 	tpriv->pt.dev = priv->dev;
 	tpriv->pt.af_packet_priv = tpriv;
 	tpriv->packet = attr;
-	dev_add_pack(&tpriv->pt);
+
+	if (!attr->dont_wait)
+		dev_add_pack(&tpriv->pt);
 
 	skb = stmmac_test_get_udp_skb(priv, attr);
 	if (!skb) {
@@ -319,7 +321,8 @@ static int __stmmac_test_loopback(struct stmmac_priv *priv,
 	ret = !tpriv->ok;
 
 cleanup:
-	dev_remove_pack(&tpriv->pt);
+	if (!attr->dont_wait)
+		dev_remove_pack(&tpriv->pt);
 	kfree(tpriv);
 	return ret;
 }
@@ -731,6 +734,9 @@ static int stmmac_test_vlan_validate(struct sk_buff *skb,
 	struct ethhdr *ehdr;
 	struct udphdr *uhdr;
 	struct iphdr *ihdr;
+	u16 proto;
+
+	proto = tpriv->double_vlan ? ETH_P_8021AD : ETH_P_8021Q;
 
 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (!skb)
@@ -740,6 +746,12 @@ static int stmmac_test_vlan_validate(struct sk_buff *skb,
 		goto out;
 	if (skb_headlen(skb) < (STMMAC_TEST_PKT_SIZE - ETH_HLEN))
 		goto out;
+	if (tpriv->vlan_id) {
+		if (skb->vlan_proto != htons(proto))
+			goto out;
+		if (skb->vlan_tci != tpriv->vlan_id)
+			goto out;
+	}
 
 	ehdr = (struct ethhdr *)skb_mac_header(skb);
 	if (!ether_addr_equal(ehdr->h_dest, tpriv->packet->dst))
@@ -1084,6 +1096,78 @@ static int stmmac_test_reg_sar(struct stmmac_priv *priv)
 	return ret;
 }
 
+static int stmmac_test_vlanoff_common(struct stmmac_priv *priv, bool svlan)
+{
+	struct stmmac_packet_attrs attr = { };
+	struct stmmac_test_priv *tpriv;
+	struct sk_buff *skb = NULL;
+	int ret = 0;
+	u16 proto;
+
+	if (!priv->dma_cap.vlins)
+		return -EOPNOTSUPP;
+
+	tpriv = kzalloc(sizeof(*tpriv), GFP_KERNEL);
+	if (!tpriv)
+		return -ENOMEM;
+
+	proto = svlan ? ETH_P_8021AD : ETH_P_8021Q;
+
+	tpriv->ok = false;
+	tpriv->double_vlan = svlan;
+	init_completion(&tpriv->comp);
+
+	tpriv->pt.type = svlan ? htons(ETH_P_8021Q) : htons(ETH_P_IP);
+	tpriv->pt.func = stmmac_test_vlan_validate;
+	tpriv->pt.dev = priv->dev;
+	tpriv->pt.af_packet_priv = tpriv;
+	tpriv->packet = &attr;
+	tpriv->vlan_id = 0x123;
+	dev_add_pack(&tpriv->pt);
+
+	ret = vlan_vid_add(priv->dev, htons(proto), tpriv->vlan_id);
+	if (ret)
+		goto cleanup;
+
+	attr.dst = priv->dev->dev_addr;
+
+	skb = stmmac_test_get_udp_skb(priv, &attr);
+	if (!skb) {
+		ret = -ENOMEM;
+		goto vlan_del;
+	}
+
+	__vlan_hwaccel_put_tag(skb, htons(proto), tpriv->vlan_id);
+	skb->protocol = htons(proto);
+
+	skb_set_queue_mapping(skb, 0);
+	ret = dev_queue_xmit(skb);
+	if (ret)
+		goto vlan_del;
+
+	wait_for_completion_timeout(&tpriv->comp, STMMAC_LB_TIMEOUT);
+	ret = tpriv->ok ? 0 : -ETIMEDOUT;
+
+vlan_del:
+	vlan_vid_del(priv->dev, htons(proto), tpriv->vlan_id);
+cleanup:
+	dev_remove_pack(&tpriv->pt);
+	kfree(tpriv);
+	return ret;
+}
+
+static int stmmac_test_vlanoff(struct stmmac_priv *priv)
+{
+	return stmmac_test_vlanoff_common(priv, false);
+}
+
+static int stmmac_test_svlanoff(struct stmmac_priv *priv)
+{
+	if (!priv->dma_cap.dvlan)
+		return -EOPNOTSUPP;
+	return stmmac_test_vlanoff_common(priv, true);
+}
+
 #define STMMAC_LOOPBACK_NONE	0
 #define STMMAC_LOOPBACK_MAC	1
 #define STMMAC_LOOPBACK_PHY	2
@@ -1161,6 +1245,14 @@ static const struct stmmac_test {
 		.name = "SA Replacement (reg)",
 		.lb = STMMAC_LOOPBACK_PHY,
 		.fn = stmmac_test_reg_sar,
+	}, {
+		.name = "VLAN TX Insertion   ",
+		.lb = STMMAC_LOOPBACK_PHY,
+		.fn = stmmac_test_vlanoff,
+	}, {
+		.name = "SVLAN TX Insertion  ",
+		.lb = STMMAC_LOOPBACK_PHY,
+		.fn = stmmac_test_svlanoff,
 	},
 };