1 /*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #ifndef IB_SRP_H
34 #define IB_SRP_H
35
36 #include <linux/types.h>
37 #include <linux/list.h>
38 #include <linux/mutex.h>
39 #include <linux/scatterlist.h>
40
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi_cmnd.h>
43
44 #include <rdma/ib_verbs.h>
45 #include <rdma/ib_sa.h>
46 #include <rdma/ib_cm.h>
47 #include <rdma/ib_fmr_pool.h>
48
49 enum {
50 SRP_PATH_REC_TIMEOUT_MS = 1000,
51 SRP_ABORT_TIMEOUT_MS = 5000,
52
53 SRP_PORT_REDIRECT = 1,
54 SRP_DLID_REDIRECT = 2,
55 SRP_STALE_CONN = 3,
56
57 SRP_MAX_LUN = 512,
58 SRP_DEF_SG_TABLESIZE = 12,
59
60 SRP_RQ_SHIFT = 6,
61 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
62 SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
63 SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
64
65 SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1),
66
67 SRP_FMR_SIZE = 256,
68 SRP_FMR_POOL_SIZE = 1024,
69 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4
70 };
71
72 #define SRP_OP_RECV (1 << 31)
73
74 enum srp_target_state {
75 SRP_TARGET_LIVE,
76 SRP_TARGET_CONNECTING,
77 SRP_TARGET_DEAD,
78 SRP_TARGET_REMOVED
79 };
80
81 enum srp_request_type {
82 SRP_REQ_NORMAL,
83 SRP_REQ_TASK_MGMT,
84 };
85
86 struct srp_device {
87 struct list_head dev_list;
88 struct ib_device *dev;
89 struct ib_pd *pd;
90 struct ib_mr *mr;
91 struct ib_fmr_pool *fmr_pool;
92 int fmr_page_shift;
93 int fmr_page_size;
94 u64 fmr_page_mask;
95 };
96
97 struct srp_host {
98 struct srp_device *srp_dev;
99 u8 port;
100 struct device dev;
101 struct list_head target_list;
102 spinlock_t target_lock;
103 struct completion released;
104 struct list_head list;
105 };
106
107 struct srp_request {
108 struct list_head list;
109 struct scsi_cmnd *scmnd;
110 struct srp_iu *cmd;
111 struct srp_iu *tsk_mgmt;
112 struct ib_pool_fmr *fmr;
113 struct completion done;
114 short index;
115 u8 cmd_done;
116 u8 tsk_status;
117 };
118
119 struct srp_target_port {
120 __be64 id_ext;
121 __be64 ioc_guid;
122 __be64 service_id;
123 __be64 initiator_ext;
124 u16 io_class;
125 struct srp_host *srp_host;
126 struct Scsi_Host *scsi_host;
127 char target_name[32];
128 unsigned int scsi_id;
129
130 struct ib_sa_path_rec path;
131 __be16 orig_dgid[8];
132 struct ib_sa_query *path_query;
133 int path_query_id;
134
135 struct ib_cm_id *cm_id;
136 struct ib_cq *cq;
137 struct ib_qp *qp;
138
139 int max_ti_iu_len;
140 s32 req_lim;
141
142 int zero_req_lim;
143
144 unsigned rx_head;
145 struct srp_iu *rx_ring[SRP_RQ_SIZE];
146
147 unsigned tx_head;
148 unsigned tx_tail;
149 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1];
150
151 struct list_head free_reqs;
152 struct list_head req_queue;
153 struct srp_request req_ring[SRP_SQ_SIZE];
154
155 struct work_struct work;
156
157 struct list_head list;
158 struct completion done;
159 int status;
160 enum srp_target_state state;
161 int qp_in_error;
162 };
163
164 struct srp_iu {
165 u64 dma;
166 void *buf;
167 size_t size;
168 enum dma_data_direction direction;
169 };
170
171 #endif /* IB_SRP_H */
172
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