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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __LIBSRP_H__3#define __LIBSRP_H__4 5#include <linux/list.h>6#include <linux/kfifo.h>7#include <scsi/srp.h>8 9enum srp_valid {10 INVALIDATE_CMD_RESP_EL = 0,11 VALID_CMD_RESP_EL = 0x80,12 VALID_INIT_MSG = 0xC0,13 VALID_TRANS_EVENT = 0xFF14};15 16enum srp_format {17 SRP_FORMAT = 1,18 MAD_FORMAT = 2,19 OS400_FORMAT = 3,20 AIX_FORMAT = 4,21 LINUX_FORMAT = 5,22 MESSAGE_IN_CRQ = 623};24 25enum srp_init_msg {26 INIT_MSG = 1,27 INIT_COMPLETE_MSG = 228};29 30enum srp_trans_event {31 UNUSED_FORMAT = 0,32 PARTNER_FAILED = 1,33 PARTNER_DEREGISTER = 2,34 MIGRATED = 6,35 PREPARE_FOR_SUSPEND = 9,36 RESUME_FROM_SUSP = 0xA37};38 39enum srp_status {40 CRQ_ENTRY_OVERWRITTEN = 0x20,41 HEADER_DESCRIPTOR = 0xF1,42 PING = 0xF5,43 PING_RESPONSE = 0xF644};45 46enum srp_mad_version {47 MAD_VERSION_1 = 148};49 50enum srp_os_type {51 OS400 = 1,52 LINUX = 2,53 AIX = 3,54 OFW = 455};56 57enum srp_task_attributes {58 SRP_SIMPLE_TASK = 0,59 SRP_HEAD_TASK = 1,60 SRP_ORDERED_TASK = 2,61 SRP_ACA_TASK = 462};63 64enum {65 SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE = 0,66 SRP_REQUEST_FIELDS_INVALID = 2,67 SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED = 4,68 SRP_TASK_MANAGEMENT_FUNCTION_FAILED = 569};70 71struct srp_buf {72 dma_addr_t dma;73 void *buf;74};75 76struct srp_queue {77 void *pool;78 void *items;79 struct kfifo queue;80 spinlock_t lock;81};82 83struct srp_target {84 struct device *dev;85 86 spinlock_t lock;87 struct list_head cmd_queue;88 89 size_t srp_iu_size;90 struct srp_queue iu_queue;91 size_t rx_ring_size;92 struct srp_buf **rx_ring;93 94 void *ldata;95};96 97struct iu_entry {98 struct srp_target *target;99 100 struct list_head ilist;101 dma_addr_t remote_token;102 unsigned long flags;103 104 struct srp_buf *sbuf;105 u16 iu_len;106};107 108struct ibmvscsis_cmd;109 110typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int,111 struct srp_direct_buf *, int,112 enum dma_data_direction, unsigned int);113int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);114void srp_target_free(struct srp_target *);115struct iu_entry *srp_iu_get(struct srp_target *);116void srp_iu_put(struct iu_entry *);117int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *,118 srp_rdma_t, int, int);119u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir);120int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir,121 u64 *data_len);122static inline int srp_cmd_direction(struct srp_cmd *cmd)123{124 return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;125}126 127#endif128