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-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.h354
1 files changed, 354 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
new file mode 100644
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1/*
2 * iSER transport for the Open iSCSI Initiator & iSER transport internals
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 Mike Christie
7 * based on code maintained by open-iscsi@googlegroups.com
8 *
9 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
10 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
11 *
12 * This software is available to you under a choice of one of two
13 * licenses. You may choose to be licensed under the terms of the GNU
14 * General Public License (GPL) Version 2, available from the file
15 * COPYING in the main directory of this source tree, or the
16 * OpenIB.org BSD license below:
17 *
18 * Redistribution and use in source and binary forms, with or
19 * without modification, are permitted provided that the following
20 * conditions are met:
21 *
22 * - Redistributions of source code must retain the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer.
25 *
26 * - Redistributions in binary form must reproduce the above
27 * copyright notice, this list of conditions and the following
28 * disclaimer in the documentation and/or other materials
29 * provided with the distribution.
30 *
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
35 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
36 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
37 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 * SOFTWARE.
39 *
40 * $Id: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
41 */
42#ifndef __ISCSI_ISER_H__
43#define __ISCSI_ISER_H__
44
45#include <linux/types.h>
46#include <linux/net.h>
47#include <scsi/libiscsi.h>
48#include <scsi/scsi_transport_iscsi.h>
49
50#include <linux/wait.h>
51#include <linux/sched.h>
52#include <linux/list.h>
53#include <linux/slab.h>
54#include <linux/dma-mapping.h>
55#include <linux/mutex.h>
56#include <linux/mempool.h>
57#include <linux/uio.h>
58
59#include <linux/socket.h>
60#include <linux/in.h>
61#include <linux/in6.h>
62
63#include <rdma/ib_verbs.h>
64#include <rdma/ib_fmr_pool.h>
65#include <rdma/rdma_cm.h>
66
67#define DRV_NAME "iser"
68#define PFX DRV_NAME ": "
69#define DRV_VER "0.1"
70#define DRV_DATE "May 7th, 2006"
71
72#define iser_dbg(fmt, arg...) \
73 do { \
74 if (iser_debug_level > 0) \
75 printk(KERN_DEBUG PFX "%s:" fmt,\
76 __func__ , ## arg); \
77 } while (0)
78
79#define iser_err(fmt, arg...) \
80 do { \
81 printk(KERN_ERR PFX "%s:" fmt, \
82 __func__ , ## arg); \
83 } while (0)
84
85 /* support upto 512KB in one RDMA */
86#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> PAGE_SHIFT)
87#define ISCSI_ISER_MAX_LUN 256
88#define ISCSI_ISER_MAX_CMD_LEN 16
89
90/* QP settings */
91/* Maximal bounds on received asynchronous PDUs */
92#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
93
94#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
95 * SCSI_TMFUNC(2), LOGOUT(1) */
96
97#define ISER_QP_MAX_RECV_DTOS (ISCSI_XMIT_CMDS_MAX + \
98 ISER_MAX_RX_MISC_PDUS + \
99 ISER_MAX_TX_MISC_PDUS)
100
101/* the max TX (send) WR supported by the iSER QP is defined by *
102 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
103 * to have at max for SCSI command. The tx posting & completion handling code *
104 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
105 * send WR. D=8 comes from 64K/8K */
106
107#define ISER_INFLIGHT_DATAOUTS 8
108
109#define ISER_QP_MAX_REQ_DTOS (ISCSI_XMIT_CMDS_MAX * \
110 (1 + ISER_INFLIGHT_DATAOUTS) + \
111 ISER_MAX_TX_MISC_PDUS + \
112 ISER_MAX_RX_MISC_PDUS)
113
114#define ISER_VER 0x10
115#define ISER_WSV 0x08
116#define ISER_RSV 0x04
117
118struct iser_hdr {
119 u8 flags;
120 u8 rsvd[3];
121 __be32 write_stag; /* write rkey */
122 __be64 write_va;
123 __be32 read_stag; /* read rkey */
124 __be64 read_va;
125} __attribute__((packed));
126
127
128/* Length of an object name string */
129#define ISER_OBJECT_NAME_SIZE 64
130
131enum iser_ib_conn_state {
132 ISER_CONN_INIT, /* descriptor allocd, no conn */
133 ISER_CONN_PENDING, /* in the process of being established */
134 ISER_CONN_UP, /* up and running */
135 ISER_CONN_TERMINATING, /* in the process of being terminated */
136 ISER_CONN_DOWN, /* shut down */
137 ISER_CONN_STATES_NUM
138};
139
140enum iser_task_status {
141 ISER_TASK_STATUS_INIT = 0,
142 ISER_TASK_STATUS_STARTED,
143 ISER_TASK_STATUS_COMPLETED
144};
145
146enum iser_data_dir {
147 ISER_DIR_IN = 0, /* to initiator */
148 ISER_DIR_OUT, /* from initiator */
149 ISER_DIRS_NUM
150};
151
152struct iser_data_buf {
153 void *buf; /* pointer to the sg list */
154 unsigned int size; /* num entries of this sg */
155 unsigned long data_len; /* total data len */
156 unsigned int dma_nents; /* returned by dma_map_sg */
157 char *copy_buf; /* allocated copy buf for SGs unaligned *
158 * for rdma which are copied */
159 struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
160 * unaligned SG */
161 };
162
163/* fwd declarations */
164struct iser_device;
165struct iscsi_iser_conn;
166struct iscsi_iser_cmd_task;
167
168struct iser_mem_reg {
169 u32 lkey;
170 u32 rkey;
171 u64 va;
172 u64 len;
173 void *mem_h;
174};
175
176struct iser_regd_buf {
177 struct iser_mem_reg reg; /* memory registration info */
178 void *virt_addr;
179 struct iser_device *device; /* device->device for dma_unmap */
180 dma_addr_t dma_addr; /* if non zero, addr for dma_unmap */
181 enum dma_data_direction direction; /* direction for dma_unmap */
182 unsigned int data_size;
183 atomic_t ref_count; /* refcount, freed when dec to 0 */
184};
185
186#define MAX_REGD_BUF_VECTOR_LEN 2
187
188struct iser_dto {
189 struct iscsi_iser_cmd_task *ctask;
190 struct iscsi_iser_conn *conn;
191 int notify_enable;
192
193 /* vector of registered buffers */
194 unsigned int regd_vector_len;
195 struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
196
197 /* offset into the registered buffer may be specified */
198 unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
199
200 /* a smaller size may be specified, if 0, then full size is used */
201 unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
202};
203
204enum iser_desc_type {
205 ISCSI_RX,
206 ISCSI_TX_CONTROL ,
207 ISCSI_TX_SCSI_COMMAND,
208 ISCSI_TX_DATAOUT
209};
210
211struct iser_desc {
212 struct iser_hdr iser_header;
213 struct iscsi_hdr iscsi_header;
214 struct iser_regd_buf hdr_regd_buf;
215 void *data; /* used by RX & TX_CONTROL */
216 struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
217 enum iser_desc_type type;
218 struct iser_dto dto;
219};
220
221struct iser_device {
222 struct ib_device *ib_device;
223 struct ib_pd *pd;
224 struct ib_cq *cq;
225 struct ib_mr *mr;
226 struct tasklet_struct cq_tasklet;
227 struct list_head ig_list; /* entry in ig devices list */
228 int refcount;
229};
230
231struct iser_conn {
232 struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
233 enum iser_ib_conn_state state; /* rdma connection state */
234 spinlock_t lock; /* used for state changes */
235 struct iser_device *device; /* device context */
236 struct rdma_cm_id *cma_id; /* CMA ID */
237 struct ib_qp *qp; /* QP */
238 struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
239 int disc_evt_flag; /* disconn event delivered */
240 wait_queue_head_t wait; /* waitq for conn/disconn */
241 atomic_t post_recv_buf_count; /* posted rx count */
242 atomic_t post_send_buf_count; /* posted tx count */
243 struct work_struct comperror_work; /* conn term sleepable ctx*/
244 char name[ISER_OBJECT_NAME_SIZE];
245 struct iser_page_vec *page_vec; /* represents SG to fmr maps*
246 * maps serialized as tx is*/
247 struct list_head conn_list; /* entry in ig conn list */
248};
249
250struct iscsi_iser_conn {
251 struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
252 struct iser_conn *ib_conn; /* iSER IB conn */
253
254 rwlock_t lock;
255};
256
257struct iscsi_iser_cmd_task {
258 struct iser_desc desc;
259 struct iscsi_iser_conn *iser_conn;
260 int rdma_data_count;/* RDMA bytes */
261 enum iser_task_status status;
262 int command_sent; /* set if command sent */
263 int dir[ISER_DIRS_NUM]; /* set if dir use*/
264 struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
265 struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
266 struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
267};
268
269struct iser_page_vec {
270 u64 *pages;
271 int length;
272 int offset;
273 int data_size;
274};
275
276struct iser_global {
277 struct mutex device_list_mutex;/* */
278 struct list_head device_list; /* all iSER devices */
279 struct mutex connlist_mutex;
280 struct list_head connlist; /* all iSER IB connections */
281
282 kmem_cache_t *desc_cache;
283};
284
285extern struct iser_global ig;
286extern int iser_debug_level;
287
288/* allocate connection resources needed for rdma functionality */
289int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
290
291int iser_send_control(struct iscsi_conn *conn,
292 struct iscsi_mgmt_task *mtask);
293
294int iser_send_command(struct iscsi_conn *conn,
295 struct iscsi_cmd_task *ctask);
296
297int iser_send_data_out(struct iscsi_conn *conn,
298 struct iscsi_cmd_task *ctask,
299 struct iscsi_data *hdr);
300
301void iscsi_iser_recv(struct iscsi_conn *conn,
302 struct iscsi_hdr *hdr,
303 char *rx_data,
304 int rx_data_len);
305
306int iser_conn_init(struct iser_conn **ib_conn);
307
308void iser_conn_terminate(struct iser_conn *ib_conn);
309
310void iser_conn_release(struct iser_conn *ib_conn);
311
312void iser_rcv_completion(struct iser_desc *desc,
313 unsigned long dto_xfer_len);
314
315void iser_snd_completion(struct iser_desc *desc);
316
317void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
318
319void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
320
321void iser_dto_buffs_release(struct iser_dto *dto);
322
323int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
324
325void iser_reg_single(struct iser_device *device,
326 struct iser_regd_buf *regd_buf,
327 enum dma_data_direction direction);
328
329int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
330 enum iser_data_dir cmd_dir);
331
332void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
333 enum iser_data_dir cmd_dir);
334
335int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
336 enum iser_data_dir cmd_dir);
337
338int iser_connect(struct iser_conn *ib_conn,
339 struct sockaddr_in *src_addr,
340 struct sockaddr_in *dst_addr,
341 int non_blocking);
342
343int iser_reg_page_vec(struct iser_conn *ib_conn,
344 struct iser_page_vec *page_vec,
345 struct iser_mem_reg *mem_reg);
346
347void iser_unreg_mem(struct iser_mem_reg *mem_reg);
348
349int iser_post_recv(struct iser_desc *rx_desc);
350int iser_post_send(struct iser_desc *tx_desc);
351
352int iser_conn_state_comp(struct iser_conn *ib_conn,
353 enum iser_ib_conn_state comp);
354#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 08:36:44 -0500