linux_kernel/drivers/net/ethernet/intel/ice/ice_controlq.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018, Intel Corporation. */

#ifndef _ICE_CONTROLQ_H_
#define _ICE_CONTROLQ_H_

#include "ice_adminq_cmd.h"

/* Maximum buffer lengths for all control queue types */
#define ICE_AQ_MAX_BUF_LEN 4096
#define ICE_MBXQ_MAX_BUF_LEN 4096

#define ICE_CTL_Q_DESC(R, i) \
	(&(((struct ice_aq_desc *)((R).desc_buf.va))[i]))

#define ICE_CTL_Q_DESC_UNUSED(R) \
	(u16)((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
	      (R)->next_to_clean - (R)->next_to_use - 1)

/* Defines that help manage the driver vs FW API checks.
 * Take a look at ice_aq_ver_check in ice_controlq.c for actual usage.
 *
 */
#define EXP_FW_API_VER_BRANCH		0x00
#define EXP_FW_API_VER_MAJOR		0x00
#define EXP_FW_API_VER_MINOR		0x01

/* Different control queue types: These are mainly for SW consumption. */
enum ice_ctl_q {
	ICE_CTL_Q_UNKNOWN = 0,
	ICE_CTL_Q_ADMIN,
	ICE_CTL_Q_MAILBOX,
};

/* Control Queue default settings */
#define ICE_CTL_Q_SQ_CMD_TIMEOUT	250  /* msecs */

struct ice_ctl_q_ring {
	void *dma_head;			/* Virtual address to dma head */
	struct ice_dma_mem desc_buf;	/* descriptor ring memory */
	void *cmd_buf;			/* command buffer memory */

	union {
		struct ice_dma_mem *sq_bi;
		struct ice_dma_mem *rq_bi;
	} r;

	u16 count;		/* Number of descriptors */

	/* used for interrupt processing */
	u16 next_to_use;
	u16 next_to_clean;

	/* used for queue tracking */
	u32 head;
	u32 tail;
	u32 len;
	u32 bah;
	u32 bal;
	u32 len_mask;
	u32 len_ena_mask;
	u32 head_mask;
};

/* sq transaction details */
struct ice_sq_cd {
	struct ice_aq_desc *wb_desc;
};

#define ICE_CTL_Q_DETAILS(R, i) (&(((struct ice_sq_cd *)((R).cmd_buf))[i]))

/* rq event information */
struct ice_rq_event_info {
	struct ice_aq_desc desc;
	u16 msg_len;
	u16 buf_len;
	u8 *msg_buf;
};

/* Control Queue information */
struct ice_ctl_q_info {
	enum ice_ctl_q qtype;
	struct ice_ctl_q_ring rq;	/* receive queue */
	struct ice_ctl_q_ring sq;	/* send queue */
	u32 sq_cmd_timeout;		/* send queue cmd write back timeout */
	u16 num_rq_entries;		/* receive queue depth */
	u16 num_sq_entries;		/* send queue depth */
	u16 rq_buf_size;		/* receive queue buffer size */
	u16 sq_buf_size;		/* send queue buffer size */
	struct mutex sq_lock;		/* Send queue lock */
	struct mutex rq_lock;		/* Receive queue lock */
	enum ice_aq_err sq_last_status;	/* last status on send queue */
	enum ice_aq_err rq_last_status;	/* last status on receive queue */
};

#endif /* _ICE_CONTROLQ_H_ */