sync to Linus v4.13-rc2 for subsystem developers to work against

1 files changed, 701 insertions, 0 deletions

diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
new file mode 100644
index 000000000000..c893b9520a67
--- /dev/null
+++ b/include/linux/avf/virtchnl.h
@@ -0,0 +1,701 @@
+/*******************************************************************************
+ *
+ * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
+ * Copyright(c) 2013 - 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+#ifndef _VIRTCHNL_H_
+#define _VIRTCHNL_H_
+
+/* Description:
+ * This header file describes the VF-PF communication protocol used
+ * by the drivers for all devices starting from our 40G product line
+ *
+ * Admin queue buffer usage:
+ * desc->opcode is always aqc_opc_send_msg_to_pf
+ * flags, retval, datalen, and data addr are all used normally.
+ * The Firmware copies the cookie fields when sending messages between the
+ * PF and VF, but uses all other fields internally. Due to this limitation,
+ * we must send all messages as "indirect", i.e. using an external buffer.
+ *
+ * All the VSI indexes are relative to the VF. Each VF can have maximum of
+ * three VSIs. All the queue indexes are relative to the VSI.  Each VF can
+ * have a maximum of sixteen queues for all of its VSIs.
+ *
+ * The PF is required to return a status code in v_retval for all messages
+ * except RESET_VF, which does not require any response. The return value
+ * is of status_code type, defined in the shared type.h.
+ *
+ * In general, VF driver initialization should roughly follow the order of
+ * these opcodes. The VF driver must first validate the API version of the
+ * PF driver, then request a reset, then get resources, then configure
+ * queues and interrupts. After these operations are complete, the VF
+ * driver may start its queues, optionally add MAC and VLAN filters, and
+ * process traffic.
+ */
+
+/* START GENERIC DEFINES
+ * Need to ensure the following enums and defines hold the same meaning and
+ * value in current and future projects
+ */
+
+/* Error Codes */
+enum virtchnl_status_code {
+	VIRTCHNL_STATUS_SUCCESS				= 0,
+	VIRTCHNL_ERR_PARAM				= -5,
+	VIRTCHNL_STATUS_ERR_OPCODE_MISMATCH		= -38,
+	VIRTCHNL_STATUS_ERR_CQP_COMPL_ERROR		= -39,
+	VIRTCHNL_STATUS_ERR_INVALID_VF_ID		= -40,
+	VIRTCHNL_STATUS_NOT_SUPPORTED			= -64,
+};
+
+#define VIRTCHNL_LINK_SPEED_100MB_SHIFT		0x1
+#define VIRTCHNL_LINK_SPEED_1000MB_SHIFT	0x2
+#define VIRTCHNL_LINK_SPEED_10GB_SHIFT		0x3
+#define VIRTCHNL_LINK_SPEED_40GB_SHIFT		0x4
+#define VIRTCHNL_LINK_SPEED_20GB_SHIFT		0x5
+#define VIRTCHNL_LINK_SPEED_25GB_SHIFT		0x6
+
+enum virtchnl_link_speed {
+	VIRTCHNL_LINK_SPEED_UNKNOWN	= 0,
+	VIRTCHNL_LINK_SPEED_100MB	= BIT(VIRTCHNL_LINK_SPEED_100MB_SHIFT),
+	VIRTCHNL_LINK_SPEED_1GB		= BIT(VIRTCHNL_LINK_SPEED_1000MB_SHIFT),
+	VIRTCHNL_LINK_SPEED_10GB	= BIT(VIRTCHNL_LINK_SPEED_10GB_SHIFT),
+	VIRTCHNL_LINK_SPEED_40GB	= BIT(VIRTCHNL_LINK_SPEED_40GB_SHIFT),
+	VIRTCHNL_LINK_SPEED_20GB	= BIT(VIRTCHNL_LINK_SPEED_20GB_SHIFT),
+	VIRTCHNL_LINK_SPEED_25GB	= BIT(VIRTCHNL_LINK_SPEED_25GB_SHIFT),
+};
+
+/* for hsplit_0 field of Rx HMC context */
+/* deprecated with AVF 1.0 */
+enum virtchnl_rx_hsplit {
+	VIRTCHNL_RX_HSPLIT_NO_SPLIT      = 0,
+	VIRTCHNL_RX_HSPLIT_SPLIT_L2      = 1,
+	VIRTCHNL_RX_HSPLIT_SPLIT_IP      = 2,
+	VIRTCHNL_RX_HSPLIT_SPLIT_TCP_UDP = 4,
+	VIRTCHNL_RX_HSPLIT_SPLIT_SCTP    = 8,
+};
+
+/* END GENERIC DEFINES */
+
+/* Opcodes for VF-PF communication. These are placed in the v_opcode field
+ * of the virtchnl_msg structure.
+ */
+enum virtchnl_ops {
+/* The PF sends status change events to VFs using
+ * the VIRTCHNL_OP_EVENT opcode.
+ * VFs send requests to the PF using the other ops.
+ * Use of "advanced opcode" features must be negotiated as part of capabilities
+ * exchange and are not considered part of base mode feature set.
+ */
+	VIRTCHNL_OP_UNKNOWN = 0,
+	VIRTCHNL_OP_VERSION = 1, /* must ALWAYS be 1 */
+	VIRTCHNL_OP_RESET_VF = 2,
+	VIRTCHNL_OP_GET_VF_RESOURCES = 3,
+	VIRTCHNL_OP_CONFIG_TX_QUEUE = 4,
+	VIRTCHNL_OP_CONFIG_RX_QUEUE = 5,
+	VIRTCHNL_OP_CONFIG_VSI_QUEUES = 6,
+	VIRTCHNL_OP_CONFIG_IRQ_MAP = 7,
+	VIRTCHNL_OP_ENABLE_QUEUES = 8,
+	VIRTCHNL_OP_DISABLE_QUEUES = 9,
+	VIRTCHNL_OP_ADD_ETH_ADDR = 10,
+	VIRTCHNL_OP_DEL_ETH_ADDR = 11,
+	VIRTCHNL_OP_ADD_VLAN = 12,
+	VIRTCHNL_OP_DEL_VLAN = 13,
+	VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE = 14,
+	VIRTCHNL_OP_GET_STATS = 15,
+	VIRTCHNL_OP_RSVD = 16,
+	VIRTCHNL_OP_EVENT = 17, /* must ALWAYS be 17 */
+	VIRTCHNL_OP_IWARP = 20, /* advanced opcode */
+	VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP = 21, /* advanced opcode */
+	VIRTCHNL_OP_RELEASE_IWARP_IRQ_MAP = 22, /* advanced opcode */
+	VIRTCHNL_OP_CONFIG_RSS_KEY = 23,
+	VIRTCHNL_OP_CONFIG_RSS_LUT = 24,
+	VIRTCHNL_OP_GET_RSS_HENA_CAPS = 25,
+	VIRTCHNL_OP_SET_RSS_HENA = 26,
+};
+
+/* This macro is used to generate a compilation error if a structure
+ * is not exactly the correct length. It gives a divide by zero error if the
+ * structure is not of the correct size, otherwise it creates an enum that is
+ * never used.
+ */
+#define VIRTCHNL_CHECK_STRUCT_LEN(n, X) enum virtchnl_static_assert_enum_##X \
+	{ virtchnl_static_assert_##X = (n)/((sizeof(struct X) == (n)) ? 1 : 0) }
+
+/* Virtual channel message descriptor. This overlays the admin queue
+ * descriptor. All other data is passed in external buffers.
+ */
+
+struct virtchnl_msg {
+	u8 pad[8];			 /* AQ flags/opcode/len/retval fields */
+	enum virtchnl_ops v_opcode; /* avoid confusion with desc->opcode */
+	enum virtchnl_status_code v_retval;  /* ditto for desc->retval */
+	u32 vfid;			 /* used by PF when sending to VF */
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(20, virtchnl_msg);
+
+/* Message descriptions and data structures.*/
+
+/* VIRTCHNL_OP_VERSION
+ * VF posts its version number to the PF. PF responds with its version number
+ * in the same format, along with a return code.
+ * Reply from PF has its major/minor versions also in param0 and param1.
+ * If there is a major version mismatch, then the VF cannot operate.
+ * If there is a minor version mismatch, then the VF can operate but should
+ * add a warning to the system log.
+ *
+ * This enum element MUST always be specified as == 1, regardless of other
+ * changes in the API. The PF must always respond to this message without
+ * error regardless of version mismatch.
+ */
+#define VIRTCHNL_VERSION_MAJOR		1
+#define VIRTCHNL_VERSION_MINOR		1
+#define VIRTCHNL_VERSION_MINOR_NO_VF_CAPS	0
+
+struct virtchnl_version_info {
+	u32 major;
+	u32 minor;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_version_info);
+
+#define VF_IS_V10(_v) (((_v)->major == 1) && ((_v)->minor == 0))
+#define VF_IS_V11(_ver) (((_ver)->major == 1) && ((_ver)->minor == 1))
+
+/* VIRTCHNL_OP_RESET_VF
+ * VF sends this request to PF with no parameters
+ * PF does NOT respond! VF driver must delay then poll VFGEN_RSTAT register
+ * until reset completion is indicated. The admin queue must be reinitialized
+ * after this operation.
+ *
+ * When reset is complete, PF must ensure that all queues in all VSIs associated
+ * with the VF are stopped, all queue configurations in the HMC are set to 0,
+ * and all MAC and VLAN filters (except the default MAC address) on all VSIs
+ * are cleared.
+ */
+
+/* VSI types that use VIRTCHNL interface for VF-PF communication. VSI_SRIOV
+ * vsi_type should always be 6 for backward compatibility. Add other fields
+ * as needed.
+ */
+enum virtchnl_vsi_type {
+	VIRTCHNL_VSI_TYPE_INVALID = 0,
+	VIRTCHNL_VSI_SRIOV = 6,
+};
+
+/* VIRTCHNL_OP_GET_VF_RESOURCES
+ * Version 1.0 VF sends this request to PF with no parameters
+ * Version 1.1 VF sends this request to PF with u32 bitmap of its capabilities
+ * PF responds with an indirect message containing
+ * virtchnl_vf_resource and one or more
+ * virtchnl_vsi_resource structures.
+ */
+
+struct virtchnl_vsi_resource {
+	u16 vsi_id;
+	u16 num_queue_pairs;
+	enum virtchnl_vsi_type vsi_type;
+	u16 qset_handle;
+	u8 default_mac_addr[ETH_ALEN];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_vsi_resource);
+
+/* VF offload flags
+ * VIRTCHNL_VF_OFFLOAD_L2 flag is inclusive of base mode L2 offloads including
+ * TX/RX Checksum offloading and TSO for non-tunnelled packets.
+ */
+#define VIRTCHNL_VF_OFFLOAD_L2			0x00000001
+#define VIRTCHNL_VF_OFFLOAD_IWARP		0x00000002
+#define VIRTCHNL_VF_OFFLOAD_RSVD		0x00000004
+#define VIRTCHNL_VF_OFFLOAD_RSS_AQ		0x00000008
+#define VIRTCHNL_VF_OFFLOAD_RSS_REG		0x00000010
+#define VIRTCHNL_VF_OFFLOAD_WB_ON_ITR		0x00000020
+#define VIRTCHNL_VF_OFFLOAD_VLAN		0x00010000
+#define VIRTCHNL_VF_OFFLOAD_RX_POLLING		0x00020000
+#define VIRTCHNL_VF_OFFLOAD_RSS_PCTYPE_V2	0x00040000
+#define VIRTCHNL_VF_OFFLOAD_RSS_PF		0X00080000
+#define VIRTCHNL_VF_OFFLOAD_ENCAP		0X00100000
+#define VIRTCHNL_VF_OFFLOAD_ENCAP_CSUM		0X00200000
+#define VIRTCHNL_VF_OFFLOAD_RX_ENCAP_CSUM	0X00400000
+
+#define VF_BASE_MODE_OFFLOADS (VIRTCHNL_VF_OFFLOAD_L2 | \
+			       VIRTCHNL_VF_OFFLOAD_VLAN | \
+			       VIRTCHNL_VF_OFFLOAD_RSS_PF)
+
+struct virtchnl_vf_resource {
+	u16 num_vsis;
+	u16 num_queue_pairs;
+	u16 max_vectors;
+	u16 max_mtu;
+
+	u32 vf_offload_flags;
+	u32 rss_key_size;
+	u32 rss_lut_size;
+
+	struct virtchnl_vsi_resource vsi_res[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(36, virtchnl_vf_resource);
+
+/* VIRTCHNL_OP_CONFIG_TX_QUEUE
+ * VF sends this message to set up parameters for one TX queue.
+ * External data buffer contains one instance of virtchnl_txq_info.
+ * PF configures requested queue and returns a status code.
+ */
+
+/* Tx queue config info */
+struct virtchnl_txq_info {
+	u16 vsi_id;
+	u16 queue_id;
+	u16 ring_len;		/* number of descriptors, multiple of 8 */
+	u16 headwb_enabled; /* deprecated with AVF 1.0 */
+	u64 dma_ring_addr;
+	u64 dma_headwb_addr; /* deprecated with AVF 1.0 */
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(24, virtchnl_txq_info);
+
+/* VIRTCHNL_OP_CONFIG_RX_QUEUE
+ * VF sends this message to set up parameters for one RX queue.
+ * External data buffer contains one instance of virtchnl_rxq_info.
+ * PF configures requested queue and returns a status code.
+ */
+
+/* Rx queue config info */
+struct virtchnl_rxq_info {
+	u16 vsi_id;
+	u16 queue_id;
+	u32 ring_len;		/* number of descriptors, multiple of 32 */
+	u16 hdr_size;
+	u16 splithdr_enabled; /* deprecated with AVF 1.0 */
+	u32 databuffer_size;
+	u32 max_pkt_size;
+	u32 pad1;
+	u64 dma_ring_addr;
+	enum virtchnl_rx_hsplit rx_split_pos; /* deprecated with AVF 1.0 */
+	u32 pad2;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(40, virtchnl_rxq_info);
+
+/* VIRTCHNL_OP_CONFIG_VSI_QUEUES
+ * VF sends this message to set parameters for all active TX and RX queues
+ * associated with the specified VSI.
+ * PF configures queues and returns status.
+ * If the number of queues specified is greater than the number of queues
+ * associated with the VSI, an error is returned and no queues are configured.
+ */
+struct virtchnl_queue_pair_info {
+	/* NOTE: vsi_id and queue_id should be identical for both queues. */
+	struct virtchnl_txq_info txq;
+	struct virtchnl_rxq_info rxq;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(64, virtchnl_queue_pair_info);
+
+struct virtchnl_vsi_queue_config_info {
+	u16 vsi_id;
+	u16 num_queue_pairs;
+	u32 pad;
+	struct virtchnl_queue_pair_info qpair[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(72, virtchnl_vsi_queue_config_info);
+
+/* VIRTCHNL_OP_CONFIG_IRQ_MAP
+ * VF uses this message to map vectors to queues.
+ * The rxq_map and txq_map fields are bitmaps used to indicate which queues
+ * are to be associated with the specified vector.
+ * The "other" causes are always mapped to vector 0.
+ * PF configures interrupt mapping and returns status.
+ */
+struct virtchnl_vector_map {
+	u16 vsi_id;
+	u16 vector_id;
+	u16 rxq_map;
+	u16 txq_map;
+	u16 rxitr_idx;
+	u16 txitr_idx;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_vector_map);
+
+struct virtchnl_irq_map_info {
+	u16 num_vectors;
+	struct virtchnl_vector_map vecmap[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(14, virtchnl_irq_map_info);
+
+/* VIRTCHNL_OP_ENABLE_QUEUES
+ * VIRTCHNL_OP_DISABLE_QUEUES
+ * VF sends these message to enable or disable TX/RX queue pairs.
+ * The queues fields are bitmaps indicating which queues to act upon.
+ * (Currently, we only support 16 queues per VF, but we make the field
+ * u32 to allow for expansion.)
+ * PF performs requested action and returns status.
+ */
+struct virtchnl_queue_select {
+	u16 vsi_id;
+	u16 pad;
+	u32 rx_queues;
+	u32 tx_queues;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_queue_select);
+
+/* VIRTCHNL_OP_ADD_ETH_ADDR
+ * VF sends this message in order to add one or more unicast or multicast
+ * address filters for the specified VSI.
+ * PF adds the filters and returns status.
+ */
+
+/* VIRTCHNL_OP_DEL_ETH_ADDR
+ * VF sends this message in order to remove one or more unicast or multicast
+ * filters for the specified VSI.
+ * PF removes the filters and returns status.
+ */
+
+struct virtchnl_ether_addr {
+	u8 addr[ETH_ALEN];
+	u8 pad[2];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_ether_addr);
+
+struct virtchnl_ether_addr_list {
+	u16 vsi_id;
+	u16 num_elements;
+	struct virtchnl_ether_addr list[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_ether_addr_list);
+
+/* VIRTCHNL_OP_ADD_VLAN
+ * VF sends this message to add one or more VLAN tag filters for receives.
+ * PF adds the filters and returns status.
+ * If a port VLAN is configured by the PF, this operation will return an
+ * error to the VF.
+ */
+
+/* VIRTCHNL_OP_DEL_VLAN
+ * VF sends this message to remove one or more VLAN tag filters for receives.
+ * PF removes the filters and returns status.
+ * If a port VLAN is configured by the PF, this operation will return an
+ * error to the VF.
+ */
+
+struct virtchnl_vlan_filter_list {
+	u16 vsi_id;
+	u16 num_elements;
+	u16 vlan_id[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_vlan_filter_list);
+
+/* VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE
+ * VF sends VSI id and flags.
+ * PF returns status code in retval.
+ * Note: we assume that broadcast accept mode is always enabled.
+ */
+struct virtchnl_promisc_info {
+	u16 vsi_id;
+	u16 flags;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_promisc_info);
+
+#define FLAG_VF_UNICAST_PROMISC	0x00000001
+#define FLAG_VF_MULTICAST_PROMISC	0x00000002
+
+/* VIRTCHNL_OP_GET_STATS
+ * VF sends this message to request stats for the selected VSI. VF uses
+ * the virtchnl_queue_select struct to specify the VSI. The queue_id
+ * field is ignored by the PF.
+ *
+ * PF replies with struct eth_stats in an external buffer.
+ */
+
+/* VIRTCHNL_OP_CONFIG_RSS_KEY
+ * VIRTCHNL_OP_CONFIG_RSS_LUT
+ * VF sends these messages to configure RSS. Only supported if both PF
+ * and VF drivers set the VIRTCHNL_VF_OFFLOAD_RSS_PF bit during
+ * configuration negotiation. If this is the case, then the RSS fields in
+ * the VF resource struct are valid.
+ * Both the key and LUT are initialized to 0 by the PF, meaning that
+ * RSS is effectively disabled until set up by the VF.
+ */
+struct virtchnl_rss_key {
+	u16 vsi_id;
+	u16 key_len;
+	u8 key[1];         /* RSS hash key, packed bytes */
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_key);
+
+struct virtchnl_rss_lut {
+	u16 vsi_id;
+	u16 lut_entries;
+	u8 lut[1];        /* RSS lookup table*/
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_lut);
+
+/* VIRTCHNL_OP_GET_RSS_HENA_CAPS
+ * VIRTCHNL_OP_SET_RSS_HENA
+ * VF sends these messages to get and set the hash filter enable bits for RSS.
+ * By default, the PF sets these to all possible traffic types that the
+ * hardware supports. The VF can query this value if it wants to change the
+ * traffic types that are hashed by the hardware.
+ */
+struct virtchnl_rss_hena {
+	u64 hena;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_rss_hena);
+
+/* VIRTCHNL_OP_EVENT
+ * PF sends this message to inform the VF driver of events that may affect it.
+ * No direct response is expected from the VF, though it may generate other
+ * messages in response to this one.
+ */
+enum virtchnl_event_codes {
+	VIRTCHNL_EVENT_UNKNOWN = 0,
+	VIRTCHNL_EVENT_LINK_CHANGE,
+	VIRTCHNL_EVENT_RESET_IMPENDING,
+	VIRTCHNL_EVENT_PF_DRIVER_CLOSE,
+};
+
+#define PF_EVENT_SEVERITY_INFO		0
+#define PF_EVENT_SEVERITY_CERTAIN_DOOM	255
+
+struct virtchnl_pf_event {
+	enum virtchnl_event_codes event;
+	union {
+		struct {
+			enum virtchnl_link_speed link_speed;
+			bool link_status;
+		} link_event;
+	} event_data;
+
+	int severity;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_pf_event);
+
+/* VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP
+ * VF uses this message to request PF to map IWARP vectors to IWARP queues.
+ * The request for this originates from the VF IWARP driver through
+ * a client interface between VF LAN and VF IWARP driver.
+ * A vector could have an AEQ and CEQ attached to it although
+ * there is a single AEQ per VF IWARP instance in which case
+ * most vectors will have an INVALID_IDX for aeq and valid idx for ceq.
+ * There will never be a case where there will be multiple CEQs attached
+ * to a single vector.
+ * PF configures interrupt mapping and returns status.
+ */
+
+struct virtchnl_iwarp_qv_info {
+	u32 v_idx; /* msix_vector */
+	u16 ceq_idx;
+	u16 aeq_idx;
+	u8 itr_idx;
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
+
+struct virtchnl_iwarp_qvlist_info {
+	u32 num_vectors;
+	struct virtchnl_iwarp_qv_info qv_info[1];
+};
+
+VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
+
+/* VF reset states - these are written into the RSTAT register:
+ * VFGEN_RSTAT on the VF
+ * When the PF initiates a reset, it writes 0
+ * When the reset is complete, it writes 1
+ * When the PF detects that the VF has recovered, it writes 2
+ * VF checks this register periodically to determine if a reset has occurred,
+ * then polls it to know when the reset is complete.
+ * If either the PF or VF reads the register while the hardware
+ * is in a reset state, it will return DEADBEEF, which, when masked
+ * will result in 3.
+ */
+enum virtchnl_vfr_states {
+	VIRTCHNL_VFR_INPROGRESS = 0,
+	VIRTCHNL_VFR_COMPLETED,
+	VIRTCHNL_VFR_VFACTIVE,
+};
+
+/**
+ * virtchnl_vc_validate_vf_msg
+ * @ver: Virtchnl version info
+ * @v_opcode: Opcode for the message
+ * @msg: pointer to the msg buffer
+ * @msglen: msg length
+ *
+ * validate msg format against struct for each opcode
+ */
+static inline int
+virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
+			    u8 *msg, u16 msglen)
+{
+	bool err_msg_format = false;
+	int valid_len = 0;
+
+	/* Validate message length. */
+	switch (v_opcode) {
+	case VIRTCHNL_OP_VERSION:
+		valid_len = sizeof(struct virtchnl_version_info);
+		break;
+	case VIRTCHNL_OP_RESET_VF:
+		break;
+	case VIRTCHNL_OP_GET_VF_RESOURCES:
+		if (VF_IS_V11(ver))
+			valid_len = sizeof(u32);
+		break;
+	case VIRTCHNL_OP_CONFIG_TX_QUEUE:
+		valid_len = sizeof(struct virtchnl_txq_info);
+		break;
+	case VIRTCHNL_OP_CONFIG_RX_QUEUE:
+		valid_len = sizeof(struct virtchnl_rxq_info);
+		break;
+	case VIRTCHNL_OP_CONFIG_VSI_QUEUES:
+		valid_len = sizeof(struct virtchnl_vsi_queue_config_info);
+		if (msglen >= valid_len) {
+			struct virtchnl_vsi_queue_config_info *vqc =
+			    (struct virtchnl_vsi_queue_config_info *)msg;
+			valid_len += (vqc->num_queue_pairs *
+				      sizeof(struct
+					     virtchnl_queue_pair_info));
+			if (vqc->num_queue_pairs == 0)
+				err_msg_format = true;
+		}
+		break;
+	case VIRTCHNL_OP_CONFIG_IRQ_MAP:
+		valid_len = sizeof(struct virtchnl_irq_map_info);
+		if (msglen >= valid_len) {
+			struct virtchnl_irq_map_info *vimi =
+			    (struct virtchnl_irq_map_info *)msg;
+			valid_len += (vimi->num_vectors *
+				      sizeof(struct virtchnl_vector_map));
+			if (vimi->num_vectors == 0)
+				err_msg_format = true;
+		}
+		break;
+	case VIRTCHNL_OP_ENABLE_QUEUES:
+	case VIRTCHNL_OP_DISABLE_QUEUES:
+		valid_len = sizeof(struct virtchnl_queue_select);
+		break;
+	case VIRTCHNL_OP_ADD_ETH_ADDR:
+	case VIRTCHNL_OP_DEL_ETH_ADDR:
+		valid_len = sizeof(struct virtchnl_ether_addr_list);
+		if (msglen >= valid_len) {
+			struct virtchnl_ether_addr_list *veal =
+			    (struct virtchnl_ether_addr_list *)msg;
+			valid_len += veal->num_elements *
+			    sizeof(struct virtchnl_ether_addr);
+			if (veal->num_elements == 0)
+				err_msg_format = true;
+		}
+		break;
+	case VIRTCHNL_OP_ADD_VLAN:
+	case VIRTCHNL_OP_DEL_VLAN:
+		valid_len = sizeof(struct virtchnl_vlan_filter_list);
+		if (msglen >= valid_len) {
+			struct virtchnl_vlan_filter_list *vfl =
+			    (struct virtchnl_vlan_filter_list *)msg;
+			valid_len += vfl->num_elements * sizeof(u16);
+			if (vfl->num_elements == 0)
+				err_msg_format = true;
+		}
+		break;
+	case VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE:
+		valid_len = sizeof(struct virtchnl_promisc_info);
+		break;
+	case VIRTCHNL_OP_GET_STATS:
+		valid_len = sizeof(struct virtchnl_queue_select);
+		break;
+	case VIRTCHNL_OP_IWARP:
+		/* These messages are opaque to us and will be validated in
+		 * the RDMA client code. We just need to check for nonzero
+		 * length. The firmware will enforce max length restrictions.
+		 */
+		if (msglen)
+			valid_len = msglen;
+		else
+			err_msg_format = true;
+		break;
+	case VIRTCHNL_OP_RELEASE_IWARP_IRQ_MAP:
+		break;
+	case VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP:
+		valid_len = sizeof(struct virtchnl_iwarp_qvlist_info);
+		if (msglen >= valid_len) {
+			struct virtchnl_iwarp_qvlist_info *qv =
+				(struct virtchnl_iwarp_qvlist_info *)msg;
+			if (qv->num_vectors == 0) {
+				err_msg_format = true;
+				break;
+			}
+			valid_len += ((qv->num_vectors - 1) *
+				sizeof(struct virtchnl_iwarp_qv_info));
+		}
+		break;
+	case VIRTCHNL_OP_CONFIG_RSS_KEY:
+		valid_len = sizeof(struct virtchnl_rss_key);
+		if (msglen >= valid_len) {
+			struct virtchnl_rss_key *vrk =
+				(struct virtchnl_rss_key *)msg;
+			valid_len += vrk->key_len - 1;
+		}
+		break;
+	case VIRTCHNL_OP_CONFIG_RSS_LUT:
+		valid_len = sizeof(struct virtchnl_rss_lut);
+		if (msglen >= valid_len) {
+			struct virtchnl_rss_lut *vrl =
+				(struct virtchnl_rss_lut *)msg;
+			valid_len += vrl->lut_entries - 1;
+		}
+		break;
+	case VIRTCHNL_OP_GET_RSS_HENA_CAPS:
+		break;
+	case VIRTCHNL_OP_SET_RSS_HENA:
+		valid_len = sizeof(struct virtchnl_rss_hena);
+		break;
+	/* These are always errors coming from the VF. */
+	case VIRTCHNL_OP_EVENT:
+	case VIRTCHNL_OP_UNKNOWN:
+	default:
+		return VIRTCHNL_ERR_PARAM;
+	}
+	/* few more checks */
+	if ((valid_len != msglen) || (err_msg_format))
+		return VIRTCHNL_STATUS_ERR_OPCODE_MISMATCH;
+
+	return 0;
+}
+#endif /* _VIRTCHNL_H_ */