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 > 1) \
75 printk(KERN_DEBUG PFX "%s:" fmt,\
79 #define iser_warn(fmt, arg...) \
81 if (iser_debug_level > 0) \
82 printk(KERN_DEBUG PFX "%s:" fmt,\
86 #define iser_err(fmt, arg...) \
88 printk(KERN_ERR PFX "%s:" fmt, \
93 #define SIZE_4K (1UL << SHIFT_4K)
94 #define MASK_4K (~(SIZE_4K-1))
96 /* support upto 512KB in one RDMA */
97 #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
98 #define ISCSI_ISER_MAX_LUN 256
99 #define ISCSI_ISER_MAX_CMD_LEN 16
102 /* Maximal bounds on received asynchronous PDUs */
103 #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
105 #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
106 * SCSI_TMFUNC(2), LOGOUT(1) */
108 #define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
109 ISER_MAX_RX_MISC_PDUS + \
110 ISER_MAX_TX_MISC_PDUS)
112 /* the max TX (send) WR supported by the iSER QP is defined by *
113 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
114 * to have at max for SCSI command. The tx posting & completion handling code *
115 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
116 * send WR. D=8 comes from 64K/8K */
118 #define ISER_INFLIGHT_DATAOUTS 8
120 #define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
121 (1 + ISER_INFLIGHT_DATAOUTS) + \
122 ISER_MAX_TX_MISC_PDUS + \
123 ISER_MAX_RX_MISC_PDUS)
125 #define ISER_VER 0x10
126 #define ISER_WSV 0x08
127 #define ISER_RSV 0x04
132 __be32 write_stag; /* write rkey */
134 __be32 read_stag; /* read rkey */
136 } __attribute__((packed));
139 /* Length of an object name string */
140 #define ISER_OBJECT_NAME_SIZE 64
142 enum iser_ib_conn_state {
143 ISER_CONN_INIT, /* descriptor allocd, no conn */
144 ISER_CONN_PENDING, /* in the process of being established */
145 ISER_CONN_UP, /* up and running */
146 ISER_CONN_TERMINATING, /* in the process of being terminated */
147 ISER_CONN_DOWN, /* shut down */
151 enum iser_task_status {
152 ISER_TASK_STATUS_INIT = 0,
153 ISER_TASK_STATUS_STARTED,
154 ISER_TASK_STATUS_COMPLETED
158 ISER_DIR_IN = 0, /* to initiator */
159 ISER_DIR_OUT, /* from initiator */
163 struct iser_data_buf {
164 void *buf; /* pointer to the sg list */
165 unsigned int size; /* num entries of this sg */
166 unsigned long data_len; /* total data len */
167 unsigned int dma_nents; /* returned by dma_map_sg */
168 char *copy_buf; /* allocated copy buf for SGs unaligned *
169 * for rdma which are copied */
170 struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
174 /* fwd declarations */
176 struct iscsi_iser_conn;
177 struct iscsi_iser_cmd_task;
179 struct iser_mem_reg {
188 struct iser_regd_buf {
189 struct iser_mem_reg reg; /* memory registration info */
191 struct iser_device *device; /* device->device for dma_unmap */
192 u64 dma_addr; /* if non zero, addr for dma_unmap */
193 enum dma_data_direction direction; /* direction for dma_unmap */
194 unsigned int data_size;
195 atomic_t ref_count; /* refcount, freed when dec to 0 */
198 #define MAX_REGD_BUF_VECTOR_LEN 2
201 struct iscsi_iser_cmd_task *ctask;
202 struct iser_conn *ib_conn;
205 /* vector of registered buffers */
206 unsigned int regd_vector_len;
207 struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
209 /* offset into the registered buffer may be specified */
210 unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
212 /* a smaller size may be specified, if 0, then full size is used */
213 unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
216 enum iser_desc_type {
219 ISCSI_TX_SCSI_COMMAND,
224 struct iser_hdr iser_header;
225 struct iscsi_hdr iscsi_header;
226 struct iser_regd_buf hdr_regd_buf;
227 void *data; /* used by RX & TX_CONTROL */
228 struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
229 enum iser_desc_type type;
234 struct ib_device *ib_device;
238 struct tasklet_struct cq_tasklet;
239 struct list_head ig_list; /* entry in ig devices list */
244 struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
245 enum iser_ib_conn_state state; /* rdma connection state */
246 spinlock_t lock; /* used for state changes */
247 struct iser_device *device; /* device context */
248 struct rdma_cm_id *cma_id; /* CMA ID */
249 struct ib_qp *qp; /* QP */
250 struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
251 int disc_evt_flag; /* disconn event delivered */
252 wait_queue_head_t wait; /* waitq for conn/disconn */
253 atomic_t post_recv_buf_count; /* posted rx count */
254 atomic_t post_send_buf_count; /* posted tx count */
255 char name[ISER_OBJECT_NAME_SIZE];
256 struct iser_page_vec *page_vec; /* represents SG to fmr maps*
257 * maps serialized as tx is*/
258 struct list_head conn_list; /* entry in ig conn list */
261 struct iscsi_iser_conn {
262 struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
263 struct iser_conn *ib_conn; /* iSER IB conn */
268 struct iscsi_iser_cmd_task {
269 struct iser_desc desc;
270 struct iscsi_iser_conn *iser_conn;
271 enum iser_task_status status;
272 int command_sent; /* set if command sent */
273 int dir[ISER_DIRS_NUM]; /* set if dir use*/
274 struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
275 struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
276 struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
279 struct iser_page_vec {
287 struct mutex device_list_mutex;/* */
288 struct list_head device_list; /* all iSER devices */
289 struct mutex connlist_mutex;
290 struct list_head connlist; /* all iSER IB connections */
292 struct kmem_cache *desc_cache;
295 extern struct iser_global ig;
296 extern int iser_debug_level;
298 /* allocate connection resources needed for rdma functionality */
299 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
301 int iser_send_control(struct iscsi_conn *conn,
302 struct iscsi_mgmt_task *mtask);
304 int iser_send_command(struct iscsi_conn *conn,
305 struct iscsi_cmd_task *ctask);
307 int iser_send_data_out(struct iscsi_conn *conn,
308 struct iscsi_cmd_task *ctask,
309 struct iscsi_data *hdr);
311 void iscsi_iser_recv(struct iscsi_conn *conn,
312 struct iscsi_hdr *hdr,
316 int iser_conn_init(struct iser_conn **ib_conn);
318 void iser_conn_terminate(struct iser_conn *ib_conn);
320 void iser_rcv_completion(struct iser_desc *desc,
321 unsigned long dto_xfer_len);
323 void iser_snd_completion(struct iser_desc *desc);
325 void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
327 void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
329 void iser_dto_buffs_release(struct iser_dto *dto);
331 int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
333 void iser_reg_single(struct iser_device *device,
334 struct iser_regd_buf *regd_buf,
335 enum dma_data_direction direction);
337 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
338 enum iser_data_dir cmd_dir);
340 int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
341 enum iser_data_dir cmd_dir);
343 int iser_connect(struct iser_conn *ib_conn,
344 struct sockaddr_in *src_addr,
345 struct sockaddr_in *dst_addr,
348 int iser_reg_page_vec(struct iser_conn *ib_conn,
349 struct iser_page_vec *page_vec,
350 struct iser_mem_reg *mem_reg);
352 void iser_unreg_mem(struct iser_mem_reg *mem_reg);
354 int iser_post_recv(struct iser_desc *rx_desc);
355 int iser_post_send(struct iser_desc *tx_desc);
357 int iser_conn_state_comp(struct iser_conn *ib_conn,
358 enum iser_ib_conn_state comp);
360 int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
361 struct iser_data_buf *data,
362 enum iser_data_dir iser_dir,
363 enum dma_data_direction dma_dir);
365 void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask);