ice: Advertise 802.1ad VLAN filtering and offloads for PF netdev

In order for the driver to support 802.1ad VLAN filtering and offloads,
it needs to advertise those VLAN features and also support modifying
those VLAN features, so make the necessary changes to
ice_set_netdev_features(). By default, enable CTAG insertion/stripping
and CTAG filtering for both Single and Double VLAN Modes (SVM/DVM).
Also, in DVM, enable STAG filtering by default. This is done by
setting the feature bits in netdev->features. Also, in DVM, support
toggling of STAG insertion/stripping, but don't enable them by
default. This is done by setting the feature bits in
netdev->hw_features.

Since 802.1ad VLAN filtering and offloads are only supported in DVM, make
sure they are not enabled by default and that they cannot be enabled
during runtime, when the device is in SVM.

Add an implementation for the ndo_fix_features() callback. This is
needed since the hardware cannot support multiple VLAN ethertypes for
VLAN insertion/stripping simultaneously and all supported VLAN filtering
must either be enabled or disabled together.

Disable inner VLAN stripping by default when DVM is enabled. If a VSI
supports stripping the inner VLAN in DVM, then it will have to configure
that during runtime. For example if a VF is configured in a port VLAN
while DVM is enabled it will be allowed to offload inner VLANs.
Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_lib.c

@@ -839,11 +839,12 @@ static void ice_vsi_set_rss_params(struct ice_vsi *vsi)
 
 /**
  * ice_set_dflt_vsi_ctx - Set default VSI context before adding a VSI
+ * @hw: HW structure used to determine the VLAN mode of the device
  * @ctxt: the VSI context being set
  *
  * This initializes a default VSI context for all sections except the Queues.
  */
-static void ice_set_dflt_vsi_ctx(struct ice_vsi_ctx *ctxt)
+static void ice_set_dflt_vsi_ctx(struct ice_hw *hw, struct ice_vsi_ctx *ctxt)
 {
 	u32 table = 0;
 
@@ -854,13 +855,27 @@ static void ice_set_dflt_vsi_ctx(struct ice_vsi_ctx *ctxt)
 	ctxt->info.sw_flags = ICE_AQ_VSI_SW_FLAG_SRC_PRUNE;
 	/* Traffic from VSI can be sent to LAN */
 	ctxt->info.sw_flags2 = ICE_AQ_VSI_SW_FLAG_LAN_ENA;
-	/* By default bits 3 and 4 in inner_vlan_flags are 0's which results in legacy
-	 * behavior (show VLAN, DEI, and UP) in descriptor. Also, allow all
-	 * packets untagged/tagged.
-	 */
+	/* allow all untagged/tagged packets by default on Tx */
 	ctxt->info.inner_vlan_flags = ((ICE_AQ_VSI_INNER_VLAN_TX_MODE_ALL &
 				  ICE_AQ_VSI_INNER_VLAN_TX_MODE_M) >>
 				 ICE_AQ_VSI_INNER_VLAN_TX_MODE_S);
+	/* SVM - by default bits 3 and 4 in inner_vlan_flags are 0's which
+	 * results in legacy behavior (show VLAN, DEI, and UP) in descriptor.
+	 *
+	 * DVM - leave inner VLAN in packet by default
+	 */
+	if (ice_is_dvm_ena(hw)) {
+		ctxt->info.inner_vlan_flags |=
+			ICE_AQ_VSI_INNER_VLAN_EMODE_NOTHING;
+		ctxt->info.outer_vlan_flags =
+			(ICE_AQ_VSI_OUTER_VLAN_TX_MODE_ALL <<
+			 ICE_AQ_VSI_OUTER_VLAN_TX_MODE_S) &
+			ICE_AQ_VSI_OUTER_VLAN_TX_MODE_M;
+		ctxt->info.outer_vlan_flags |=
+			(ICE_AQ_VSI_OUTER_TAG_VLAN_8100 <<
+			 ICE_AQ_VSI_OUTER_TAG_TYPE_S) &
+			ICE_AQ_VSI_OUTER_TAG_TYPE_M;
+	}
 	/* Have 1:1 UP mapping for both ingress/egress tables */
 	table |= ICE_UP_TABLE_TRANSLATE(0, 0);
 	table |= ICE_UP_TABLE_TRANSLATE(1, 1);
@@ -1137,7 +1152,7 @@ static int ice_vsi_init(struct ice_vsi *vsi, bool init_vsi)
 				~ICE_AQ_VSI_SW_FLAG_RX_VLAN_PRUNE_ENA;
 	}
 
-	ice_set_dflt_vsi_ctx(ctxt);
+	ice_set_dflt_vsi_ctx(hw, ctxt);
 	if (test_bit(ICE_FLAG_FD_ENA, pf->flags))
 		ice_set_fd_vsi_ctx(ctxt, vsi);
 	/* if the switch is in VEB mode, allow VSI loopback */