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Edit File : target_core_user.h \| Size : 4.52 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef __TARGET_CORE_USER_H #define __TARGET_CORE_USER_H / This header will be used by application too / #include <linux/types.h> #include <linux/uio.h> #define TCMU_VERSION "2.0" /* * DOC: Ring Design * Ring Design * ----------- * * The mmaped area is divided into three parts: * 1) The mailbox (struct tcmu_mailbox, below); * 2) The command ring; * 3) Everything beyond the command ring (data). * * The mailbox tells userspace the offset of the command ring from the * start of the shared memory region, and how big the command ring is. * * The kernel passes SCSI commands to userspace by putting a struct * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking * userspace via UIO's interrupt mechanism. * * tcmu_cmd_entry contains a header. If the header type is PAD, * userspace should skip hdr->length bytes (mod cmdr_size) to find the * next cmd_entry. * * Otherwise, the entry will contain offsets into the mmaped area that * contain the cdb and data buffers -- the latter accessible via the * iov array. iov addresses are also offsets into the shared area. * * When userspace is completed handling the command, set * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate, * and also set mailbox->cmd_tail equal to the old cmd_tail plus * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it * should process the next packet the same way, and so on. / #define TCMU_MAILBOX_VERSION 2 #define ALIGN_SIZE 64 / Should be enough for most CPUs / #define TCMU_MAILBOX_FLAG_CAP_OOOC (1 << 0) / Out-of-order completions / #define TCMU_MAILBOX_FLAG_CAP_READ_LEN (1 << 1) / Read data length / #define TCMU_MAILBOX_FLAG_CAP_TMR (1 << 2) / TMR notifications / #define TCMU_MAILBOX_FLAG_CAP_KEEP_BUF (1<<3) / Keep buf after cmd completion / struct tcmu_mailbox { __u16 version; __u16 flags; __u32 cmdr_off; __u32 cmdr_size; __u32 cmd_head; / Updated by user. On its own cacheline / __u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE))); } __attribute__((packed)); enum tcmu_opcode { TCMU_OP_PAD = 0, TCMU_OP_CMD, TCMU_OP_TMR, }; / * Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode. / struct tcmu_cmd_entry_hdr { __u32 len_op; __u16 cmd_id; __u8 kflags; #define TCMU_UFLAG_UNKNOWN_OP 0x1 #define TCMU_UFLAG_READ_LEN 0x2 #define TCMU_UFLAG_KEEP_BUF 0x4 __u8 uflags; } __attribute__((packed)); #define TCMU_OP_MASK 0x7 static __inline__ enum tcmu_opcode tcmu_hdr_get_op(__u32 len_op) { return len_op & TCMU_OP_MASK; } static __inline__ void tcmu_hdr_set_op(__u32 len_op, enum tcmu_opcode op) { len_op &= ~TCMU_OP_MASK; len_op \|= (op & TCMU_OP_MASK); } static __inline__ __u32 tcmu_hdr_get_len(__u32 len_op) { return len_op & ~TCMU_OP_MASK; } static __inline__ void tcmu_hdr_set_len(__u32 len_op, __u32 len) { len_op &= TCMU_OP_MASK; len_op \|= len; } / Currently the same as SCSI_SENSE_BUFFERSIZE / #define TCMU_SENSE_BUFFERSIZE 96 struct tcmu_cmd_entry { struct tcmu_cmd_entry_hdr hdr; union { struct { __u32 iov_cnt; __u32 iov_bidi_cnt; __u32 iov_dif_cnt; __u64 cdb_off; __u64 __pad1; __u64 __pad2; struct iovec iov[0]; } req; struct { __u8 scsi_status; __u8 __pad1; __u16 __pad2; __u32 read_len; char sense_buffer[TCMU_SENSE_BUFFERSIZE]; } rsp; }; } __attribute__((packed)); struct tcmu_tmr_entry { struct tcmu_cmd_entry_hdr hdr; #define TCMU_TMR_UNKNOWN 0 #define TCMU_TMR_ABORT_TASK 1 #define TCMU_TMR_ABORT_TASK_SET 2 #define TCMU_TMR_CLEAR_ACA 3 #define TCMU_TMR_CLEAR_TASK_SET 4 #define TCMU_TMR_LUN_RESET 5 #define TCMU_TMR_TARGET_WARM_RESET 6 #define TCMU_TMR_TARGET_COLD_RESET 7 / Pseudo reset due to received PR OUT */ #define TCMU_TMR_LUN_RESET_PRO 128 __u8 tmr_type; __u8 __pad1; __u16 __pad2; __u32 cmd_cnt; __u64 __pad3; __u64 __pad4; __u16 cmd_ids[0]; } __attribute__((packed)); #define TCMU_OP_ALIGN_SIZE sizeof(__u64) enum tcmu_genl_cmd { TCMU_CMD_UNSPEC, TCMU_CMD_ADDED_DEVICE, TCMU_CMD_REMOVED_DEVICE, TCMU_CMD_RECONFIG_DEVICE, TCMU_CMD_ADDED_DEVICE_DONE, TCMU_CMD_REMOVED_DEVICE_DONE, TCMU_CMD_RECONFIG_DEVICE_DONE, TCMU_CMD_SET_FEATURES, __TCMU_CMD_MAX, }; #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1) enum tcmu_genl_attr { TCMU_ATTR_UNSPEC, TCMU_ATTR_DEVICE, TCMU_ATTR_MINOR, TCMU_ATTR_PAD, TCMU_ATTR_DEV_CFG, TCMU_ATTR_DEV_SIZE, TCMU_ATTR_WRITECACHE, TCMU_ATTR_CMD_STATUS, TCMU_ATTR_DEVICE_ID, TCMU_ATTR_SUPP_KERN_CMD_REPLY, __TCMU_ATTR_MAX, }; #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1) #endif Back

Edit File : target_core_user.h | Size : 4.52 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __TARGET_CORE_USER_H
#define __TARGET_CORE_USER_H

/* This header will be used by application too */

#include <linux/types.h>
#include <linux/uio.h>

#define TCMU_VERSION "2.0"

/**
 * DOC: Ring Design
 * Ring Design
 * -----------
 *
 * The mmaped area is divided into three parts:
 * 1) The mailbox (struct tcmu_mailbox, below);
 * 2) The command ring;
 * 3) Everything beyond the command ring (data).
 *
 * The mailbox tells userspace the offset of the command ring from the
 * start of the shared memory region, and how big the command ring is.
 *
 * The kernel passes SCSI commands to userspace by putting a struct
 * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking
 * userspace via UIO's interrupt mechanism.
 *
 * tcmu_cmd_entry contains a header. If the header type is PAD,
 * userspace should skip hdr->length bytes (mod cmdr_size) to find the
 * next cmd_entry.
 *
 * Otherwise, the entry will contain offsets into the mmaped area that
 * contain the cdb and data buffers -- the latter accessible via the
 * iov array. iov addresses are also offsets into the shared area.
 *
 * When userspace is completed handling the command, set
 * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate,
 * and also set mailbox->cmd_tail equal to the old cmd_tail plus
 * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it
 * should process the next packet the same way, and so on.
 */

#define TCMU_MAILBOX_VERSION 2
#define ALIGN_SIZE 64 /* Should be enough for most CPUs */
#define TCMU_MAILBOX_FLAG_CAP_OOOC (1 << 0) /* Out-of-order completions */
#define TCMU_MAILBOX_FLAG_CAP_READ_LEN (1 << 1) /* Read data length */
#define TCMU_MAILBOX_FLAG_CAP_TMR (1 << 2) /* TMR notifications */
#define TCMU_MAILBOX_FLAG_CAP_KEEP_BUF (1<<3) /* Keep buf after cmd completion */

struct tcmu_mailbox {
	__u16 version;
	__u16 flags;
	__u32 cmdr_off;
	__u32 cmdr_size;

__u32 cmd_head;

/* Updated by user. On its own cacheline */
	__u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE)));

} __attribute__((packed));

enum tcmu_opcode {
	TCMU_OP_PAD = 0,
	TCMU_OP_CMD,
	TCMU_OP_TMR,
};

/*
 * Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode.
 */
struct tcmu_cmd_entry_hdr {
	__u32 len_op;
	__u16 cmd_id;
	__u8 kflags;
#define TCMU_UFLAG_UNKNOWN_OP 0x1
#define TCMU_UFLAG_READ_LEN   0x2
#define TCMU_UFLAG_KEEP_BUF   0x4
	__u8 uflags;

} __attribute__((packed));

#define TCMU_OP_MASK 0x7

static __inline__ enum tcmu_opcode tcmu_hdr_get_op(__u32 len_op)
{
	return len_op & TCMU_OP_MASK;
}

static __inline__ void tcmu_hdr_set_op(__u32 *len_op, enum tcmu_opcode op)
{
	*len_op &= ~TCMU_OP_MASK;
	*len_op |= (op & TCMU_OP_MASK);
}

static __inline__ __u32 tcmu_hdr_get_len(__u32 len_op)
{
	return len_op & ~TCMU_OP_MASK;
}

static __inline__ void tcmu_hdr_set_len(__u32 *len_op, __u32 len)
{
	*len_op &= TCMU_OP_MASK;
	*len_op |= len;
}

/* Currently the same as SCSI_SENSE_BUFFERSIZE */
#define TCMU_SENSE_BUFFERSIZE 96

struct tcmu_cmd_entry {
	struct tcmu_cmd_entry_hdr hdr;

union {
		struct {
			__u32 iov_cnt;
			__u32 iov_bidi_cnt;
			__u32 iov_dif_cnt;
			__u64 cdb_off;
			__u64 __pad1;
			__u64 __pad2;
			struct iovec iov[0];
		} req;
		struct {
			__u8 scsi_status;
			__u8 __pad1;
			__u16 __pad2;
			__u32 read_len;
			char sense_buffer[TCMU_SENSE_BUFFERSIZE];
		} rsp;
	};

} __attribute__((packed));

struct tcmu_tmr_entry {
	struct tcmu_cmd_entry_hdr hdr;

#define TCMU_TMR_UNKNOWN		0
#define TCMU_TMR_ABORT_TASK		1
#define TCMU_TMR_ABORT_TASK_SET		2
#define TCMU_TMR_CLEAR_ACA		3
#define TCMU_TMR_CLEAR_TASK_SET		4
#define TCMU_TMR_LUN_RESET		5
#define TCMU_TMR_TARGET_WARM_RESET	6
#define TCMU_TMR_TARGET_COLD_RESET	7
/* Pseudo reset due to received PR OUT */
#define TCMU_TMR_LUN_RESET_PRO		128
	__u8 tmr_type;

__u8 __pad1;
	__u16 __pad2;
	__u32 cmd_cnt;
	__u64 __pad3;
	__u64 __pad4;
	__u16 cmd_ids[0];
} __attribute__((packed));

#define TCMU_OP_ALIGN_SIZE sizeof(__u64)

enum tcmu_genl_cmd {
	TCMU_CMD_UNSPEC,
	TCMU_CMD_ADDED_DEVICE,
	TCMU_CMD_REMOVED_DEVICE,
	TCMU_CMD_RECONFIG_DEVICE,
	TCMU_CMD_ADDED_DEVICE_DONE,
	TCMU_CMD_REMOVED_DEVICE_DONE,
	TCMU_CMD_RECONFIG_DEVICE_DONE,
	TCMU_CMD_SET_FEATURES,
	__TCMU_CMD_MAX,
};
#define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)

enum tcmu_genl_attr {
	TCMU_ATTR_UNSPEC,
	TCMU_ATTR_DEVICE,
	TCMU_ATTR_MINOR,
	TCMU_ATTR_PAD,
	TCMU_ATTR_DEV_CFG,
	TCMU_ATTR_DEV_SIZE,
	TCMU_ATTR_WRITECACHE,
	TCMU_ATTR_CMD_STATUS,
	TCMU_ATTR_DEVICE_ID,
	TCMU_ATTR_SUPP_KERN_CMD_REPLY,
	__TCMU_ATTR_MAX,
};
#define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)

#endif

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