iavf: Add support for VIRTCHNL_VF_OFFLOAD_VLAN_V2 offload enable/disable

The new VIRTCHNL_VF_OFFLOAD_VLAN_V2 capability added support that allows
the VF to support 802.1Q and 802.1ad VLAN insertion and stripping if
successfully negotiated via VIRTCHNL_OP_GET_OFFLOAD_VLAN_V2_CAPS.
Multiple changes were needed to support this new functionality.

1. Added new aq_required flags to support any kind of VLAN stripping and
   insertion offload requests via virtchnl.

2. Added the new method iavf_set_vlan_offload_features() that's
   used during VF initialization, VF reset, and iavf_set_features() to
   set the aq_required bits based on the current VLAN offload
   configuration of the VF's netdev.

3. Added virtchnl handling for VIRTCHNL_OP_ENABLE_STRIPPING_V2,
   VIRTCHNL_OP_DISABLE_STRIPPING_V2, VIRTCHNL_OP_ENABLE_INSERTION_V2,
   and VIRTCHNL_OP_ENABLE_INSERTION_V2.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 203 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 3e1b95011146..5ee1d118fd30 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -1124,6 +1124,204 @@ void iavf_disable_vlan_stripping(struct iavf_adapter *adapter)
 	iavf_send_pf_msg(adapter, VIRTCHNL_OP_DISABLE_VLAN_STRIPPING, NULL, 0);
 }
 
+/**
+ * iavf_tpid_to_vc_ethertype - transform from VLAN TPID to virtchnl ethertype
+ * @tpid: VLAN TPID (i.e. 0x8100, 0x88a8, etc.)
+ */
+static u32 iavf_tpid_to_vc_ethertype(u16 tpid)
+{
+	switch (tpid) {
+	case ETH_P_8021Q:
+		return VIRTCHNL_VLAN_ETHERTYPE_8100;
+	case ETH_P_8021AD:
+		return VIRTCHNL_VLAN_ETHERTYPE_88A8;
+	}
+
+	return 0;
+}
+
+/**
+ * iavf_set_vc_offload_ethertype - set virtchnl ethertype for offload message
+ * @adapter: adapter structure
+ * @msg: message structure used for updating offloads over virtchnl to update
+ * @tpid: VLAN TPID (i.e. 0x8100, 0x88a8, etc.)
+ * @offload_op: opcode used to determine which support structure to check
+ */
+static int
+iavf_set_vc_offload_ethertype(struct iavf_adapter *adapter,
+			      struct virtchnl_vlan_setting *msg, u16 tpid,
+			      enum virtchnl_ops offload_op)
+{
+	struct virtchnl_vlan_supported_caps *offload_support;
+	u16 vc_ethertype = iavf_tpid_to_vc_ethertype(tpid);
+
+	/* reference the correct offload support structure */
+	switch (offload_op) {
+	case VIRTCHNL_OP_ENABLE_VLAN_STRIPPING_V2:
+	case VIRTCHNL_OP_DISABLE_VLAN_STRIPPING_V2:
+		offload_support =
+			&adapter->vlan_v2_caps.offloads.stripping_support;
+		break;
+	case VIRTCHNL_OP_ENABLE_VLAN_INSERTION_V2:
+	case VIRTCHNL_OP_DISABLE_VLAN_INSERTION_V2:
+		offload_support =
+			&adapter->vlan_v2_caps.offloads.insertion_support;
+		break;
+	default:
+		dev_err(&adapter->pdev->dev, "Invalid opcode %d for setting virtchnl ethertype to enable/disable VLAN offloads\n",
+			offload_op);
+		return -EINVAL;
+	}
+
+	/* make sure ethertype is supported */
+	if (offload_support->outer & vc_ethertype &&
+	    offload_support->outer & VIRTCHNL_VLAN_TOGGLE) {
+		msg->outer_ethertype_setting = vc_ethertype;
+	} else if (offload_support->inner & vc_ethertype &&
+		   offload_support->inner & VIRTCHNL_VLAN_TOGGLE) {
+		msg->inner_ethertype_setting = vc_ethertype;
+	} else {
+		dev_dbg(&adapter->pdev->dev, "opcode %d unsupported for VLAN TPID 0x%04x\n",
+			offload_op, tpid);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * iavf_clear_offload_v2_aq_required - clear AQ required bit for offload request
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID
+ * @offload_op: opcode used to determine which AQ required bit to clear
+ */
+static void
+iavf_clear_offload_v2_aq_required(struct iavf_adapter *adapter, u16 tpid,
+				  enum virtchnl_ops offload_op)
+{
+	switch (offload_op) {
+	case VIRTCHNL_OP_ENABLE_VLAN_STRIPPING_V2:
+		if (tpid == ETH_P_8021Q)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_ENABLE_CTAG_VLAN_STRIPPING;
+		else if (tpid == ETH_P_8021AD)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_ENABLE_STAG_VLAN_STRIPPING;
+		break;
+	case VIRTCHNL_OP_DISABLE_VLAN_STRIPPING_V2:
+		if (tpid == ETH_P_8021Q)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_DISABLE_CTAG_VLAN_STRIPPING;
+		else if (tpid == ETH_P_8021AD)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_DISABLE_STAG_VLAN_STRIPPING;
+		break;
+	case VIRTCHNL_OP_ENABLE_VLAN_INSERTION_V2:
+		if (tpid == ETH_P_8021Q)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_ENABLE_CTAG_VLAN_INSERTION;
+		else if (tpid == ETH_P_8021AD)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_ENABLE_STAG_VLAN_INSERTION;
+		break;
+	case VIRTCHNL_OP_DISABLE_VLAN_INSERTION_V2:
+		if (tpid == ETH_P_8021Q)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_DISABLE_CTAG_VLAN_INSERTION;
+		else if (tpid == ETH_P_8021AD)
+			adapter->aq_required &=
+				~IAVF_FLAG_AQ_DISABLE_STAG_VLAN_INSERTION;
+		break;
+	default:
+		dev_err(&adapter->pdev->dev, "Unsupported opcode %d specified for clearing aq_required bits for VIRTCHNL_VF_OFFLOAD_VLAN_V2 offload request\n",
+			offload_op);
+	}
+}
+
+/**
+ * iavf_send_vlan_offload_v2 - send offload enable/disable over virtchnl
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID used for the command (i.e. 0x8100 or 0x88a8)
+ * @offload_op: offload_op used to make the request over virtchnl
+ */
+static void
+iavf_send_vlan_offload_v2(struct iavf_adapter *adapter, u16 tpid,
+			  enum virtchnl_ops offload_op)
+{
+	struct virtchnl_vlan_setting *msg;
+	int len = sizeof(*msg);
+
+	if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
+		/* bail because we already have a command pending */
+		dev_err(&adapter->pdev->dev, "Cannot send %d, command %d pending\n",
+			offload_op, adapter->current_op);
+		return;
+	}
+
+	adapter->current_op = offload_op;
+
+	msg = kzalloc(len, GFP_KERNEL);
+	if (!msg)
+		return;
+
+	msg->vport_id = adapter->vsi_res->vsi_id;
+
+	/* always clear to prevent unsupported and endless requests */
+	iavf_clear_offload_v2_aq_required(adapter, tpid, offload_op);
+
+	/* only send valid offload requests */
+	if (!iavf_set_vc_offload_ethertype(adapter, msg, tpid, offload_op))
+		iavf_send_pf_msg(adapter, offload_op, (u8 *)msg, len);
+	else
+		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
+
+	kfree(msg);
+}
+
+/**
+ * iavf_enable_vlan_stripping_v2 - enable VLAN stripping
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID used to enable VLAN stripping
+ */
+void iavf_enable_vlan_stripping_v2(struct iavf_adapter *adapter, u16 tpid)
+{
+	iavf_send_vlan_offload_v2(adapter, tpid,
+				  VIRTCHNL_OP_ENABLE_VLAN_STRIPPING_V2);
+}
+
+/**
+ * iavf_disable_vlan_stripping_v2 - disable VLAN stripping
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID used to disable VLAN stripping
+ */
+void iavf_disable_vlan_stripping_v2(struct iavf_adapter *adapter, u16 tpid)
+{
+	iavf_send_vlan_offload_v2(adapter, tpid,
+				  VIRTCHNL_OP_DISABLE_VLAN_STRIPPING_V2);
+}
+
+/**
+ * iavf_enable_vlan_insertion_v2 - enable VLAN insertion
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID used to enable VLAN insertion
+ */
+void iavf_enable_vlan_insertion_v2(struct iavf_adapter *adapter, u16 tpid)
+{
+	iavf_send_vlan_offload_v2(adapter, tpid,
+				  VIRTCHNL_OP_ENABLE_VLAN_INSERTION_V2);
+}
+
+/**
+ * iavf_disable_vlan_insertion_v2 - disable VLAN insertion
+ * @adapter: adapter structure
+ * @tpid: VLAN TPID used to disable VLAN insertion
+ */
+void iavf_disable_vlan_insertion_v2(struct iavf_adapter *adapter, u16 tpid)
+{
+	iavf_send_vlan_offload_v2(adapter, tpid,
+				  VIRTCHNL_OP_DISABLE_VLAN_INSERTION_V2);
+}
+
 #define IAVF_MAX_SPEED_STRLEN	13
 
 /**
@@ -1964,6 +2162,11 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 			dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n",
 				 __FUNCTION__);
 
+		/* Request VLAN offload settings */
+		if (VLAN_V2_ALLOWED(adapter))
+			iavf_set_vlan_offload_features(adapter, 0,
+						       netdev->features);
+
 		iavf_set_queue_vlan_tag_loc(adapter);
 
 		}