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 9 enum srp_valid { 10 INVALIDATE_CMD_RESP_EL = 0, 11 VALID_CMD_RESP_EL = 0x80, 12 VALID_INIT_MSG = 0xC0, 13 VALID_TRANS_EVENT = 0xFF 14 }; 15 16 enum 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 = 6 23 }; 24 25 enum srp_init_msg { 26 INIT_MSG = 1, 27 INIT_COMPLETE_MSG = 2 28 }; 29 30 enum 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 = 0xA 37 }; 38 39 enum srp_status { 40 CRQ_ENTRY_OVERWRITTEN = 0x20, 41 HEADER_DESCRIPTOR = 0xF1, 42 PING = 0xF5, 43 PING_RESPONSE = 0xF6 44 }; 45 46 enum srp_mad_version { 47 MAD_VERSION_1 = 1 48 }; 49 50 enum srp_os_type { 51 OS400 = 1, 52 LINUX = 2, 53 AIX = 3, 54 OFW = 4 55 }; 56 57 enum srp_task_attributes { 58 SRP_SIMPLE_TASK = 0, 59 SRP_HEAD_TASK = 1, 60 SRP_ORDERED_TASK = 2, 61 SRP_ACA_TASK = 4 62 }; 63 64 enum { 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 = 5 69 }; 70 71 struct srp_buf { 72 dma_addr_t dma; 73 void *buf; 74 }; 75 76 struct srp_queue { 77 void *pool; 78 void *items; 79 struct kfifo queue; 80 spinlock_t lock; 81 }; 82 83 struct 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 97 struct 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 }; 107 108 struct ibmvscsis_cmd; 109 110 typedef int (srp_rdma_t)(struct ibmvscsis_cmd *, struct scatterlist *, int, 111 struct srp_direct_buf *, int, 112 enum dma_data_direction, unsigned int); 113 int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t); 114 void srp_target_free(struct srp_target *); 115 struct iu_entry *srp_iu_get(struct srp_target *); 116 void srp_iu_put(struct iu_entry *); 117 int srp_transfer_data(struct ibmvscsis_cmd *, struct srp_cmd *, 118 srp_rdma_t, int, int); 119 u64 srp_data_length(struct srp_cmd *cmd, enum dma_data_direction dir); 120 int srp_get_desc_table(struct srp_cmd *srp_cmd, enum dma_data_direction *dir, 121 u64 *data_len); 122 static 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 #endif 128