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ib_srp.h
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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 
63  SRP_SQ_SIZE = SRP_RQ_SIZE,
64  SRP_RSP_SQ_SIZE = 1,
65  SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
66  SRP_TSK_MGMT_SQ_SIZE = 1,
67  SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
68 
69  SRP_TAG_NO_REQ = ~0U,
70  SRP_TAG_TSK_MGMT = 1U << 31,
71 
72  SRP_FMR_SIZE = 512,
73  SRP_FMR_MIN_SIZE = 128,
74  SRP_FMR_POOL_SIZE = 1024,
75  SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4,
76 
77  SRP_MAP_ALLOW_FMR = 0,
78  SRP_MAP_NO_FMR = 1,
79 };
80 
81 enum srp_target_state {
82  SRP_TARGET_LIVE,
83  SRP_TARGET_CONNECTING,
84  SRP_TARGET_DEAD,
85  SRP_TARGET_REMOVED
86 };
87 
88 enum srp_iu_type {
89  SRP_IU_CMD,
90  SRP_IU_TSK_MGMT,
91  SRP_IU_RSP,
92 };
93 
94 struct srp_device {
95  struct list_head dev_list;
96  struct ib_device *dev;
97  struct ib_pd *pd;
98  struct ib_mr *mr;
99  struct ib_fmr_pool *fmr_pool;
100  u64 fmr_page_mask;
101  int fmr_page_size;
102  int fmr_max_size;
103 };
104 
105 struct srp_host {
106  struct srp_device *srp_dev;
107  u8 port;
108  struct device dev;
109  struct list_head target_list;
110  spinlock_t target_lock;
111  struct completion released;
112  struct list_head list;
113 };
114 
115 struct srp_request {
116  struct list_head list;
117  struct scsi_cmnd *scmnd;
118  struct srp_iu *cmd;
119  struct ib_pool_fmr **fmr_list;
120  u64 *map_page;
121  struct srp_direct_buf *indirect_desc;
122  dma_addr_t indirect_dma_addr;
123  short nfmr;
124  short index;
125 };
126 
127 struct srp_target_port {
128  /* These are RW in the hot path, and commonly used together */
129  struct list_head free_tx;
130  struct list_head free_reqs;
131  spinlock_t lock;
132  s32 req_lim;
133 
134  /* These are read-only in the hot path */
135  struct ib_cq *send_cq ____cacheline_aligned_in_smp;
136  struct ib_cq *recv_cq;
137  struct ib_qp *qp;
138  u32 lkey;
139  u32 rkey;
140  enum srp_target_state state;
141  unsigned int max_iu_len;
142  unsigned int cmd_sg_cnt;
143  unsigned int indirect_size;
144  bool allow_ext_sg;
145 
146  /* Everything above this point is used in the hot path of
147  * command processing. Try to keep them packed into cachelines.
148  */
149 
150  __be64 id_ext;
151  __be64 ioc_guid;
152  __be64 service_id;
153  __be64 initiator_ext;
154  u16 io_class;
155  struct srp_host *srp_host;
156  struct Scsi_Host *scsi_host;
157  char target_name[32];
158  unsigned int scsi_id;
159  unsigned int sg_tablesize;
160 
161  struct ib_sa_path_rec path;
162  __be16 orig_dgid[8];
163  struct ib_sa_query *path_query;
164  int path_query_id;
165 
166  struct ib_cm_id *cm_id;
167 
168  int max_ti_iu_len;
169 
170  int zero_req_lim;
171 
172  struct srp_iu *tx_ring[SRP_SQ_SIZE];
173  struct srp_iu *rx_ring[SRP_RQ_SIZE];
174  struct srp_request req_ring[SRP_CMD_SQ_SIZE];
175 
176  struct work_struct work;
177 
178  struct list_head list;
179  struct completion done;
180  int status;
181  int qp_in_error;
182 
183  struct completion tsk_mgmt_done;
184  u8 tsk_mgmt_status;
185 };
186 
187 struct srp_iu {
188  struct list_head list;
189  u64 dma;
190  void *buf;
191  size_t size;
192  enum dma_data_direction direction;
193 };
194 
195 struct srp_map_state {
196  struct ib_pool_fmr **next_fmr;
197  struct srp_direct_buf *desc;
198  u64 *pages;
199  dma_addr_t base_dma_addr;
200  u32 fmr_len;
201  u32 total_len;
202  unsigned int npages;
203  unsigned int nfmr;
204  unsigned int ndesc;
205  struct scatterlist *unmapped_sg;
206  int unmapped_index;
207  dma_addr_t unmapped_addr;
208 };
209 
210 #endif /* IB_SRP_H */
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