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/*******************************************************************************

Copyright (c) 2013 - 2015, Intel Corporation
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 1. Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

 3. Neither the name of the Intel Corporation nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

***************************************************************************/

#ifndef _I40E_VIRTCHNL_H_
#define _I40E_VIRTCHNL_H_

#include "i40e_type.h"

/* Description:
 * This header file describes the VF-PF communication protocol used
 * by the various i40e drivers.
 *
 * Admin queue buffer usage:
 * desc->opcode is always i40e_aqc_opc_send_msg_to_pf
 * flags, retval, datalen, and data addr are all used normally.
 * 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
 * i40e_status_code type, defined in the i40e_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.
 */

/* Opcodes for VF-PF communication. These are placed in the v_opcode field
 * of the virtchnl_msg structure.
 */
enum i40e_virtchnl_ops {
/* The PF sends status change events to VFs using
 * the I40E_VIRTCHNL_OP_EVENT opcode.
 * VFs send requests to the PF using the other ops.
 */
	I40E_VIRTCHNL_OP_UNKNOWN = 0,
	I40E_VIRTCHNL_OP_VERSION = 1, /* must ALWAYS be 1 */
	I40E_VIRTCHNL_OP_RESET_VF = 2,
	I40E_VIRTCHNL_OP_GET_VF_RESOURCES = 3,
	I40E_VIRTCHNL_OP_CONFIG_TX_QUEUE = 4,
	I40E_VIRTCHNL_OP_CONFIG_RX_QUEUE = 5,
	I40E_VIRTCHNL_OP_CONFIG_VSI_QUEUES = 6,
	I40E_VIRTCHNL_OP_CONFIG_IRQ_MAP = 7,
	I40E_VIRTCHNL_OP_ENABLE_QUEUES = 8,
	I40E_VIRTCHNL_OP_DISABLE_QUEUES = 9,
	I40E_VIRTCHNL_OP_ADD_ETHER_ADDRESS = 10,
	I40E_VIRTCHNL_OP_DEL_ETHER_ADDRESS = 11,
	I40E_VIRTCHNL_OP_ADD_VLAN = 12,
	I40E_VIRTCHNL_OP_DEL_VLAN = 13,
	I40E_VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE = 14,
	I40E_VIRTCHNL_OP_GET_STATS = 15,
	I40E_VIRTCHNL_OP_FCOE = 16,
	I40E_VIRTCHNL_OP_EVENT = 17, /* must ALWAYS be 17 */
#ifdef I40E_SOL_VF_SUPPORT
	I40E_VIRTCHNL_OP_GET_ADDNL_SOL_CONFIG = 19,
#endif
	I40E_VIRTCHNL_OP_CONFIG_RSS_KEY = 23,
	I40E_VIRTCHNL_OP_CONFIG_RSS_LUT = 24,
	I40E_VIRTCHNL_OP_GET_RSS_HENA_CAPS = 25,
	I40E_VIRTCHNL_OP_SET_RSS_HENA = 26,

};

/* Virtual channel message descriptor. This overlays the admin queue
 * descriptor. All other data is passed in external buffers.
 */

struct i40e_virtchnl_msg {
	u8 pad[8];			 /* AQ flags/opcode/len/retval fields */
	enum i40e_virtchnl_ops v_opcode; /* avoid confusion with desc->opcode */
	enum i40e_status_code v_retval;  /* ditto for desc->retval */
	u32 vfid;			 /* used by PF when sending to VF */
};

/* Message descriptions and data structures.*/

/* I40E_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 I40E_VIRTCHNL_VERSION_MAJOR		1
#define I40E_VIRTCHNL_VERSION_MINOR		1
#define I40E_VIRTCHNL_VERSION_MINOR_NO_VF_CAPS	0

struct i40e_virtchnl_version_info {
	u32 major;
	u32 minor;
};

/* I40E_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.
 */

/* I40E_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
 * i40e_virtchnl_vf_resource and one or more
 * i40e_virtchnl_vsi_resource structures.
 */

struct i40e_virtchnl_vsi_resource {
	u16 vsi_id;
	u16 num_queue_pairs;
	enum i40e_vsi_type vsi_type;
	u16 qset_handle;
	u8 default_mac_addr[I40E_ETH_LENGTH_OF_ADDRESS];
};
/* VF offload flags */
#define I40E_VIRTCHNL_VF_OFFLOAD_L2		0x00000001
#define I40E_VIRTCHNL_VF_OFFLOAD_IWARP		0x00000002
#define I40E_VIRTCHNL_VF_OFFLOAD_FCOE		0x00000004
#define I40E_VIRTCHNL_VF_OFFLOAD_RSS_AQ		0x00000008
#define I40E_VIRTCHNL_VF_OFFLOAD_RSS_REG	0x00000010
#define I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR	0x00000020
#define I40E_VIRTCHNL_VF_OFFLOAD_VLAN		0x00010000
#define I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING	0x00020000
#define I40E_VIRTCHNL_VF_OFFLOAD_RSS_PCTYPE_V2	0x00040000
#define I40E_VIRTCHNL_VF_OFFLOAD_RSS_PF		0X00080000

struct i40e_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 i40e_virtchnl_vsi_resource vsi_res[1];
};

/* I40E_VIRTCHNL_OP_CONFIG_TX_QUEUE
 * VF sends this message to set up parameters for one TX queue.
 * External data buffer contains one instance of i40e_virtchnl_txq_info.
 * PF configures requested queue and returns a status code.
 */

/* Tx queue config info */
struct i40e_virtchnl_txq_info {
	u16 vsi_id;
	u16 queue_id;
	u16 ring_len;		/* number of descriptors, multiple of 8 */
	u16 headwb_enabled;
	u64 dma_ring_addr;
	u64 dma_headwb_addr;
};

/* I40E_VIRTCHNL_OP_CONFIG_RX_QUEUE
 * VF sends this message to set up parameters for one RX queue.
 * External data buffer contains one instance of i40e_virtchnl_rxq_info.
 * PF configures requested queue and returns a status code.
 */

/* Rx queue config info */
struct i40e_virtchnl_rxq_info {
	u16 vsi_id;
	u16 queue_id;
	u32 ring_len;		/* number of descriptors, multiple of 32 */
	u16 hdr_size;
	u16 splithdr_enabled;
	u32 databuffer_size;
	u32 max_pkt_size;
	u64 dma_ring_addr;
	enum i40e_hmc_obj_rx_hsplit_0 rx_split_pos;
};

/* I40E_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 i40e_virtchnl_queue_pair_info {
	/* NOTE: vsi_id and queue_id should be identical for both queues. */
	struct i40e_virtchnl_txq_info txq;
	struct i40e_virtchnl_rxq_info rxq;
};

struct i40e_virtchnl_vsi_queue_config_info {
	u16 vsi_id;
	u16 num_queue_pairs;
	struct i40e_virtchnl_queue_pair_info qpair[1];
};

/* I40E_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 i40e_virtchnl_vector_map {
	u16 vsi_id;
	u16 vector_id;
	u16 rxq_map;
	u16 txq_map;
	u16 rxitr_idx;
	u16 txitr_idx;
};

struct i40e_virtchnl_irq_map_info {
	u16 num_vectors;
	struct i40e_virtchnl_vector_map vecmap[1];
};

/* I40E_VIRTCHNL_OP_ENABLE_QUEUES
 * I40E_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 i40e_virtchnl_queue_select {
	u16 vsi_id;
	u16 pad;
	u32 rx_queues;
	u32 tx_queues;
};

/* I40E_VIRTCHNL_OP_ADD_ETHER_ADDRESS
 * 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.
 */

/* I40E_VIRTCHNL_OP_DEL_ETHER_ADDRESS
 * 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 i40e_virtchnl_ether_addr {
	u8 addr[I40E_ETH_LENGTH_OF_ADDRESS];
	u8 pad[2];
};

struct i40e_virtchnl_ether_addr_list {
	u16 vsi_id;
	u16 num_elements;
	struct i40e_virtchnl_ether_addr list[1];
};

#ifdef I40E_SOL_VF_SUPPORT
/* I40E_VIRTCHNL_OP_GET_ADDNL_SOL_CONFIG
 * VF sends this message to get the default MTU and list of additional ethernet
 * addresses it is allowed to use.
 * PF responds with an indirect message containing
 * i40e_virtchnl_addnl_solaris_config with zero or more
 * i40e_virtchnl_ether_addr structures.
 *
 * It is expected that this operation will only ever be needed for Solaris VFs
 * running under a Solaris PF.
 */
struct i40e_virtchnl_addnl_solaris_config {
	u16 default_mtu;
	struct i40e_virtchnl_ether_addr_list al;
};

#endif
/* I40E_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.
 */

/* I40E_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 i40e_virtchnl_vlan_filter_list {
	u16 vsi_id;
	u16 num_elements;
	u16 vlan_id[1];
};

/* I40E_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 i40e_virtchnl_promisc_info {
	u16 vsi_id;
	u16 flags;
};

#define I40E_FLAG_VF_UNICAST_PROMISC	0x00000001
#define I40E_FLAG_VF_MULTICAST_PROMISC	0x00000002

/* I40E_VIRTCHNL_OP_GET_STATS
 * VF sends this message to request stats for the selected VSI. VF uses
 * the i40e_virtchnl_queue_select struct to specify the VSI. The queue_id
 * field is ignored by the PF.
 *
 * PF replies with struct i40e_eth_stats in an external buffer.
 */

/* I40E_VIRTCHNL_OP_CONFIG_RSS_KEY
 * I40E_VIRTCHNL_OP_CONFIG_RSS_LUT
 * VF sends these messages to configure RSS. Only supported if both PF
 * and VF drivers set the I40E_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 i40e_virtchnl_rss_key {
	u16 vsi_id;
	u16 key_len;
	u8 key[1];         /* RSS hash key, packed bytes */
};

struct i40e_virtchnl_rss_lut {
	u16 vsi_id;
	u16 lut_entries;
	u8 lut[1];        /* RSS lookup table*/
};

/* I40E_VIRTCHNL_OP_GET_RSS_HENA_CAPS
 * I40E_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.
 * Traffic types are defined in the i40e_filter_pctype enum in i40e_type.h
 */
struct i40e_virtchnl_rss_hena {
	u64 hena;
};

/* I40E_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 i40e_virtchnl_event_codes {
	I40E_VIRTCHNL_EVENT_UNKNOWN = 0,
	I40E_VIRTCHNL_EVENT_LINK_CHANGE,
	I40E_VIRTCHNL_EVENT_RESET_IMPENDING,
	I40E_VIRTCHNL_EVENT_PF_DRIVER_CLOSE,
};
#define I40E_PF_EVENT_SEVERITY_INFO		0
#define I40E_PF_EVENT_SEVERITY_ATTENTION	1
#define I40E_PF_EVENT_SEVERITY_ACTION_REQUIRED	2
#define I40E_PF_EVENT_SEVERITY_CERTAIN_DOOM	255

struct i40e_virtchnl_pf_event {
	enum i40e_virtchnl_event_codes event;
	union {
		struct {
			enum i40e_aq_link_speed link_speed;
			bool link_status;
		} link_event;
	} event_data;

	int severity;
};

/* VF reset states - these are written into the RSTAT register:
 * I40E_VFGEN_RSTAT1 on the PF
 * I40E_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 i40e_vfr_states {
	I40E_VFR_INPROGRESS = 0,
	I40E_VFR_COMPLETED,
	I40E_VFR_VFACTIVE,
	I40E_VFR_UNKNOWN,
};

#endif /* _I40E_VIRTCHNL_H_ */