i40e: VLAN field for flow director

Allow user to specify VLAN field and add it to flow director. Show VLAN
field in "ethtool -n ethx" command.
Handle VLAN type and tag field provided by ethtool command. Refactored
filter addition, by replacing static arrays with runtime dummy packet
creation, which allows specifying VLAN field.
Previously, VLAN field was omitted.

Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -223,6 +223,8 @@ struct i40e_fdir_filter {
 	__be16 dst_port;
 	__be32 sctp_v_tag;
 
+	__be16 vlan_etype;
+	__be16 vlan_tag;
 	/* Flexible data to match within the packet payload */
 	__be16 flex_word;
 	u16 flex_offset;

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -3318,6 +3318,14 @@ static int i40e_get_ethtool_fdir_entry(struct i40e_pf *pf,
 	else
 		fsp->ring_cookie = rule->q_index;
 
+	if (rule->vlan_tag) {
+		fsp->h_ext.vlan_etype = rule->vlan_etype;
+		fsp->m_ext.vlan_etype = htons(0xFFFF);
+		fsp->h_ext.vlan_tci = rule->vlan_tag;
+		fsp->m_ext.vlan_tci = htons(0xFFFF);
+		fsp->flow_type |= FLOW_EXT;
+	}
+
 	if (rule->dest_vsi != pf->vsi[pf->lan_vsi]->id) {
 		struct i40e_vsi *vsi;
 
@@ -4350,6 +4358,19 @@ static int i40e_check_fdir_input_set(struct i40e_vsi *vsi,
 		return -EOPNOTSUPP;
 	}
 
+	if (fsp->flow_type & FLOW_EXT) {
+		/* Allow only 802.1Q and no etype defined, as
+		 * later it's modified to 0x8100
+		 */
+		if (fsp->h_ext.vlan_etype != htons(ETH_P_8021Q) &&
+		    fsp->h_ext.vlan_etype != 0)
+			return -EOPNOTSUPP;
+		if (fsp->m_ext.vlan_tci == htons(0xFFFF))
+			new_mask |= I40E_VLAN_SRC_MASK;
+		else
+			new_mask &= ~I40E_VLAN_SRC_MASK;
+	}
+
 	/* First, clear all flexible filter entries */
 	new_mask &= ~I40E_FLEX_INPUT_MASK;
 
@@ -4529,7 +4550,9 @@ static bool i40e_match_fdir_filter(struct i40e_fdir_filter *a,
 	    a->dst_port != b->dst_port ||
 	    a->src_port != b->src_port ||
 	    a->flow_type != b->flow_type ||
-	    a->ipl4_proto != b->ipl4_proto)
+	    a->ipl4_proto != b->ipl4_proto ||
+	    a->vlan_tag != b->vlan_tag ||
+	    a->vlan_etype != b->vlan_etype)
 		return false;
 
 	return true;
@@ -4688,6 +4711,11 @@ static int i40e_add_fdir_ethtool(struct i40e_vsi *vsi,
 	input->src_ip = fsp->h_u.tcp_ip4_spec.ip4dst;
 	input->flow_type = fsp->flow_type & ~FLOW_EXT;
 
+	input->vlan_etype = fsp->h_ext.vlan_etype;
+	if (!fsp->m_ext.vlan_etype && fsp->h_ext.vlan_tci)
+		input->vlan_etype = cpu_to_be16(ETH_P_8021Q);
+	if (fsp->m_ext.vlan_tci && input->vlan_etype)
+		input->vlan_tag = fsp->h_ext.vlan_tci;
 	if (input->flow_type == IPV6_USER_FLOW ||
 	    input->flow_type == UDP_V6_FLOW ||
 	    input->flow_type == TCP_V6_FLOW ||