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