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 | = 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 | |