IB/srp: allow task management without a previous request
[linux-2.6.git] / drivers / infiniband / ulp / srp / ib_srp.h
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_RQ_MASK             = SRP_RQ_SIZE - 1,
63
64         SRP_SQ_SIZE             = SRP_RQ_SIZE,
65         SRP_SQ_MASK             = SRP_SQ_SIZE - 1,
66         SRP_RSP_SQ_SIZE         = 1,
67         SRP_REQ_SQ_SIZE         = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
68         SRP_TSK_MGMT_SQ_SIZE    = 1,
69         SRP_CMD_SQ_SIZE         = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
70
71         SRP_TAG_NO_REQ          = ~0U,
72         SRP_TAG_TSK_MGMT        = 1U << 31,
73
74         SRP_FMR_SIZE            = 256,
75         SRP_FMR_POOL_SIZE       = 1024,
76         SRP_FMR_DIRTY_SIZE      = SRP_FMR_POOL_SIZE / 4
77 };
78
79 enum srp_target_state {
80         SRP_TARGET_LIVE,
81         SRP_TARGET_CONNECTING,
82         SRP_TARGET_DEAD,
83         SRP_TARGET_REMOVED
84 };
85
86 enum srp_iu_type {
87         SRP_IU_CMD,
88         SRP_IU_TSK_MGMT,
89         SRP_IU_RSP,
90 };
91
92 struct srp_device {
93         struct list_head        dev_list;
94         struct ib_device       *dev;
95         struct ib_pd           *pd;
96         struct ib_mr           *mr;
97         struct ib_fmr_pool     *fmr_pool;
98         int                     fmr_page_shift;
99         int                     fmr_page_size;
100         u64                     fmr_page_mask;
101 };
102
103 struct srp_host {
104         struct srp_device      *srp_dev;
105         u8                      port;
106         struct device           dev;
107         struct list_head        target_list;
108         spinlock_t              target_lock;
109         struct completion       released;
110         struct list_head        list;
111 };
112
113 struct srp_request {
114         struct list_head        list;
115         struct scsi_cmnd       *scmnd;
116         struct srp_iu          *cmd;
117         struct ib_pool_fmr     *fmr;
118         short                   index;
119 };
120
121 struct srp_target_port {
122         __be64                  id_ext;
123         __be64                  ioc_guid;
124         __be64                  service_id;
125         __be64                  initiator_ext;
126         u16                     io_class;
127         struct srp_host        *srp_host;
128         struct Scsi_Host       *scsi_host;
129         char                    target_name[32];
130         unsigned int            scsi_id;
131
132         struct ib_sa_path_rec   path;
133         __be16                  orig_dgid[8];
134         struct ib_sa_query     *path_query;
135         int                     path_query_id;
136
137         struct ib_cm_id        *cm_id;
138         struct ib_cq           *recv_cq;
139         struct ib_cq           *send_cq;
140         struct ib_qp           *qp;
141
142         int                     max_ti_iu_len;
143         s32                     req_lim;
144
145         int                     zero_req_lim;
146
147         unsigned                rx_head;
148         struct srp_iu          *rx_ring[SRP_RQ_SIZE];
149
150         unsigned                tx_head;
151         unsigned                tx_tail;
152         struct srp_iu          *tx_ring[SRP_SQ_SIZE];
153
154         struct list_head        free_reqs;
155         struct list_head        req_queue;
156         struct srp_request      req_ring[SRP_CMD_SQ_SIZE];
157
158         struct work_struct      work;
159
160         struct list_head        list;
161         struct completion       done;
162         int                     status;
163         enum srp_target_state   state;
164         int                     qp_in_error;
165
166         struct completion       tsk_mgmt_done;
167         u8                      tsk_mgmt_status;
168 };
169
170 struct srp_iu {
171         u64                     dma;
172         void                   *buf;
173         size_t                  size;
174         enum dma_data_direction direction;
175         enum srp_iu_type        type;
176 };
177
178 #endif /* IB_SRP_H */