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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LIBSRP_H__
#define __LIBSRP_H__
#include <linux/list.h>
#include <linux/kfifo.h>
#include <scsi/srp.h>
enum srp_valid {
INVALIDATE_CMD_RESP_EL = 0,
VALID_CMD_RESP_EL = 0x80,
VALID_INIT_MSG = 0xC0,
VALID_TRANS_EVENT = 0xFF
};
enum srp_format {
SRP_FORMAT = 1,
MAD_FORMAT = 2,
OS400_FORMAT = 3,
AIX_FORMAT = 4,
LINUX_FORMAT = 5,
MESSAGE_IN_CRQ = 6
};
enum srp_init_msg {
INIT_MSG = 1,
INIT_COMPLETE_MSG = 2
};
enum srp_trans_event {
UNUSED_FORMAT = 0,
PARTNER_FAILED = 1,
PARTNER_DEREGISTER = 2,
MIGRATED = 6,
PREPARE_FOR_SUSPEND = 9,
RESUME_FROM_SUSP = 0xA
};
enum srp_status {
CRQ_ENTRY_OVERWRITTEN = 0x20,
HEADER_DESCRIPTOR = 0xF1,
PING = 0xF5,
PING_RESPONSE = 0xF6
};
enum srp_mad_version {
MAD_VERSION_1 = 1
};
enum srp_os_type {
OS400 = 1,
LINUX = 2,
AIX = 3,
OFW = 4
};
enum srp_task_attributes {
SRP_SIMPLE_TASK = 0,
SRP_HEAD_TASK = 1,
SRP_ORDERED_TASK = 2,
SRP_ACA_TASK = 4
};
enum {
SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE = 0,
SRP_REQUEST_FIELDS_INVALID = 2,
SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED = 4,
SRP_TASK_MANAGEMENT_FUNCTION_FAILED = 5
};
struct srp_buf {
dma_addr_t dma;
void *buf;
};
struct srp_queue {
void *pool;
void *items;
struct kfifo queue;
spinlock_t lock;
};
struct srp_target {
struct device *dev;
spinlock_t lock;
struct list_head cmd_queue;
size_t srp_iu_size;
struct srp_queue iu_queue;
size_t rx_ring_size;
struct srp_buf **rx_ring;
void *ldata;
};
struct iu_entry {
struct srp_target *target;
struct list_head ilist;
dma_addr_t remote_token;
unsigned long flags;
struct srp_buf *sbuf;
u16 iu_len;
};
struct ibmvscsis_cmd;
typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,
struct srp_direct_buf *, int,
enum dma_data_direction, unsigned int);
int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
void srp_target_free(struct srp_target *);
struct iu_entry *srp_iu_get(struct srp_target *);
void srp_iu_put(struct iu_entry *);
int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,
srp_rdma_t, int, int);
u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);
int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
u64 *data_len);
static inline int srp_cmd_direction(struct srp_cmd *cmd)
{
return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
}
#endif
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