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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
88a678bb BL |
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, | |
464fd641 MC |
34 | MIGRATED = 6, |
35 | PREPARE_FOR_SUSPEND = 9, | |
36 | RESUME_FROM_SUSP = 0xA | |
88a678bb BL |
37 | }; |
38 | ||
39 | enum srp_status { | |
464fd641 | 40 | CRQ_ENTRY_OVERWRITTEN = 0x20, |
88a678bb BL |
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 |