ixv: Separate VFTA table for each interface

The vlan setting is independent for each interface. Use VFTA table in
'struct ixgbe_softc' that is already defined.

This pull request fixes following bug scenario.

    create ixv0.10
    create ixv1.10
    destroy ixv1.10
    create ixv0.11
    ixv0.10 no longer receives vlan 10 packets.

In this case, destroying ixv1.10 affects to ixv0.

MFC after:	1 week
Pull Request:	freebsd/freebsd-src#774

sys/dev/ixgbe/if_ixv.c

@@ -197,12 +197,6 @@ TUNABLE_INT("hw.ixv.flow_control", &ixv_flow_control);
 static int ixv_header_split = false;
 TUNABLE_INT("hw.ixv.hdr_split", &ixv_header_split);
 
-/*
- * Shadow VFTA table, this is needed because
- * the real filter table gets cleared during
- * a soft reset and we need to repopulate it.
- */
-static u32 ixv_shadow_vfta[IXGBE_VFTA_SIZE];
 extern struct if_txrx ixgbe_txrx;
 
 static struct if_shared_ctx ixv_sctx_init = {
@@ -1541,9 +1535,9 @@ ixv_setup_vlan_support(if_ctx_t ctx)
 	 * we need to repopulate it now.
 	 */
 	for (int i = 0; i < IXGBE_VFTA_SIZE; i++) {
-		if (ixv_shadow_vfta[i] == 0)
+		if (sc->shadow_vfta[i] == 0)
 			continue;
-		vfta = ixv_shadow_vfta[i];
+		vfta = sc->shadow_vfta[i];
 		/*
 		 * Reconstruct the vlan id's
 		 * based on the bits set in each
@@ -1579,7 +1573,7 @@ ixv_if_register_vlan(if_ctx_t ctx, u16 vtag)
 
 	index = (vtag >> 5) & 0x7F;
 	bit = vtag & 0x1F;
-	ixv_shadow_vfta[index] |= (1 << bit);
+	sc->shadow_vfta[index] |= (1 << bit);
 	++sc->num_vlans;
 } /* ixv_if_register_vlan */
 
@@ -1597,7 +1591,7 @@ ixv_if_unregister_vlan(if_ctx_t ctx, u16 vtag)
 
 	index = (vtag >> 5) & 0x7F;
 	bit = vtag & 0x1F;
-	ixv_shadow_vfta[index] &= ~(1 << bit);
+	sc->shadow_vfta[index] &= ~(1 << bit);
 	--sc->num_vlans;
 } /* ixv_if_unregister_vlan */