2 * iSER transport for the Open iSCSI Initiator & iSER transport internals
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
9 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
10 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
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:
18 * Redistribution and use in source and binary forms, with or
19 * without modification, are permitted provided that the following
22 * - Redistributions of source code must retain the above
23 * copyright notice, this list of conditions and the following
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.
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
40 * $Id: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
42 #ifndef __ISCSI_ISER_H__
43 #define __ISCSI_ISER_H__
45 #include <linux/types.h>
46 #include <linux/net.h>
47 #include <scsi/libiscsi.h>
48 #include <scsi/scsi_transport_iscsi.h>
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>
59 #include <linux/socket.h>
61 #include <linux/in6.h>
63 #include <rdma/ib_verbs.h>
64 #include <rdma/ib_fmr_pool.h>
65 #include <rdma/rdma_cm.h>
67 #define DRV_NAME "iser"
68 #define PFX DRV_NAME ": "
70 #define DRV_DATE "May 7th, 2006"
72 #define iser_dbg(fmt, arg...) \
74 if (iser_debug_level > 0) \
75 printk(KERN_DEBUG PFX "%s:" fmt,\
79 #define iser_err(fmt, arg...) \
81 printk(KERN_ERR PFX "%s:" fmt, \
86 #define SIZE_4K (1UL << SHIFT_4K)
87 #define MASK_4K (~(SIZE_4K-1))
89 /* support upto 512KB in one RDMA */
90 #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
91 #define ISCSI_ISER_MAX_LUN 256
92 #define ISCSI_ISER_MAX_CMD_LEN 16
95 /* Maximal bounds on received asynchronous PDUs */
96 #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
98 #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
99 * SCSI_TMFUNC(2), LOGOUT(1) */
101 #define ISER_QP_MAX_RECV_DTOS (ISCSI_XMIT_CMDS_MAX + \
102 ISER_MAX_RX_MISC_PDUS + \
103 ISER_MAX_TX_MISC_PDUS)
105 /* the max TX (send) WR supported by the iSER QP is defined by *
106 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
107 * to have at max for SCSI command. The tx posting & completion handling code *
108 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
109 * send WR. D=8 comes from 64K/8K */
111 #define ISER_INFLIGHT_DATAOUTS 8
113 #define ISER_QP_MAX_REQ_DTOS (ISCSI_XMIT_CMDS_MAX * \
114 (1 + ISER_INFLIGHT_DATAOUTS) + \
115 ISER_MAX_TX_MISC_PDUS + \
116 ISER_MAX_RX_MISC_PDUS)
118 #define ISER_VER 0x10
119 #define ISER_WSV 0x08
120 #define ISER_RSV 0x04
125 __be32 write_stag; /* write rkey */
127 __be32 read_stag; /* read rkey */
129 } __attribute__((packed));
132 /* Length of an object name string */
133 #define ISER_OBJECT_NAME_SIZE 64
135 enum iser_ib_conn_state {
136 ISER_CONN_INIT, /* descriptor allocd, no conn */
137 ISER_CONN_PENDING, /* in the process of being established */
138 ISER_CONN_UP, /* up and running */
139 ISER_CONN_TERMINATING, /* in the process of being terminated */
140 ISER_CONN_DOWN, /* shut down */
144 enum iser_task_status {
145 ISER_TASK_STATUS_INIT = 0,
146 ISER_TASK_STATUS_STARTED,
147 ISER_TASK_STATUS_COMPLETED
151 ISER_DIR_IN = 0, /* to initiator */
152 ISER_DIR_OUT, /* from initiator */
156 struct iser_data_buf {
157 void *buf; /* pointer to the sg list */
158 unsigned int size; /* num entries of this sg */
159 unsigned long data_len; /* total data len */
160 unsigned int dma_nents; /* returned by dma_map_sg */
161 char *copy_buf; /* allocated copy buf for SGs unaligned *
162 * for rdma which are copied */
163 struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
167 /* fwd declarations */
169 struct iscsi_iser_conn;
170 struct iscsi_iser_cmd_task;
172 struct iser_mem_reg {
181 struct iser_regd_buf {
182 struct iser_mem_reg reg; /* memory registration info */
184 struct iser_device *device; /* device->device for dma_unmap */
185 u64 dma_addr; /* if non zero, addr for dma_unmap */
186 enum dma_data_direction direction; /* direction for dma_unmap */
187 unsigned int data_size;
188 atomic_t ref_count; /* refcount, freed when dec to 0 */
191 #define MAX_REGD_BUF_VECTOR_LEN 2
194 struct iscsi_iser_cmd_task *ctask;
195 struct iser_conn *ib_conn;
198 /* vector of registered buffers */
199 unsigned int regd_vector_len;
200 struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
202 /* offset into the registered buffer may be specified */
203 unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
205 /* a smaller size may be specified, if 0, then full size is used */
206 unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
209 enum iser_desc_type {
212 ISCSI_TX_SCSI_COMMAND,
217 struct iser_hdr iser_header;
218 struct iscsi_hdr iscsi_header;
219 struct iser_regd_buf hdr_regd_buf;
220 void *data; /* used by RX & TX_CONTROL */
221 struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
222 enum iser_desc_type type;
227 struct ib_device *ib_device;
231 struct tasklet_struct cq_tasklet;
232 struct list_head ig_list; /* entry in ig devices list */
237 struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
238 enum iser_ib_conn_state state; /* rdma connection state */
239 spinlock_t lock; /* used for state changes */
240 struct iser_device *device; /* device context */
241 struct rdma_cm_id *cma_id; /* CMA ID */
242 struct ib_qp *qp; /* QP */
243 struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
244 int disc_evt_flag; /* disconn event delivered */
245 wait_queue_head_t wait; /* waitq for conn/disconn */
246 atomic_t post_recv_buf_count; /* posted rx count */
247 atomic_t post_send_buf_count; /* posted tx count */
248 struct work_struct comperror_work; /* conn term sleepable ctx*/
249 char name[ISER_OBJECT_NAME_SIZE];
250 struct iser_page_vec *page_vec; /* represents SG to fmr maps*
251 * maps serialized as tx is*/
252 struct list_head conn_list; /* entry in ig conn list */
255 struct iscsi_iser_conn {
256 struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
257 struct iser_conn *ib_conn; /* iSER IB conn */
262 struct iscsi_iser_cmd_task {
263 struct iser_desc desc;
264 struct iscsi_iser_conn *iser_conn;
265 enum iser_task_status status;
266 int command_sent; /* set if command sent */
267 int dir[ISER_DIRS_NUM]; /* set if dir use*/
268 struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
269 struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
270 struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
273 struct iser_page_vec {
281 struct mutex device_list_mutex;/* */
282 struct list_head device_list; /* all iSER devices */
283 struct mutex connlist_mutex;
284 struct list_head connlist; /* all iSER IB connections */
286 struct kmem_cache *desc_cache;
289 extern struct iser_global ig;
290 extern int iser_debug_level;
292 /* allocate connection resources needed for rdma functionality */
293 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
295 int iser_send_control(struct iscsi_conn *conn,
296 struct iscsi_mgmt_task *mtask);
298 int iser_send_command(struct iscsi_conn *conn,
299 struct iscsi_cmd_task *ctask);
301 int iser_send_data_out(struct iscsi_conn *conn,
302 struct iscsi_cmd_task *ctask,
303 struct iscsi_data *hdr);
305 void iscsi_iser_recv(struct iscsi_conn *conn,
306 struct iscsi_hdr *hdr,
310 int iser_conn_init(struct iser_conn **ib_conn);
312 void iser_conn_terminate(struct iser_conn *ib_conn);
314 void iser_conn_release(struct iser_conn *ib_conn);
316 void iser_rcv_completion(struct iser_desc *desc,
317 unsigned long dto_xfer_len);
319 void iser_snd_completion(struct iser_desc *desc);
321 void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
323 void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
325 void iser_dto_buffs_release(struct iser_dto *dto);
327 int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
329 void iser_reg_single(struct iser_device *device,
330 struct iser_regd_buf *regd_buf,
331 enum dma_data_direction direction);
333 int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
334 enum iser_data_dir cmd_dir);
336 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
337 enum iser_data_dir cmd_dir);
339 int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
340 enum iser_data_dir cmd_dir);
342 int iser_connect(struct iser_conn *ib_conn,
343 struct sockaddr_in *src_addr,
344 struct sockaddr_in *dst_addr,
347 int iser_reg_page_vec(struct iser_conn *ib_conn,
348 struct iser_page_vec *page_vec,
349 struct iser_mem_reg *mem_reg);
351 void iser_unreg_mem(struct iser_mem_reg *mem_reg);
353 int iser_post_recv(struct iser_desc *rx_desc);
354 int iser_post_send(struct iser_desc *tx_desc);
356 int iser_conn_state_comp(struct iser_conn *ib_conn,
357 enum iser_ib_conn_state comp);
359 int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
360 struct iser_data_buf *data,
361 enum iser_data_dir iser_dir,
362 enum dma_data_direction dma_dir);
364 void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask);