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 #ifndef __ISCSI_ISER_H__
41 #define __ISCSI_ISER_H__
43 #include <linux/types.h>
44 #include <linux/net.h>
45 #include <scsi/libiscsi.h>
46 #include <scsi/scsi_transport_iscsi.h>
48 #include <linux/wait.h>
49 #include <linux/sched.h>
50 #include <linux/list.h>
51 #include <linux/slab.h>
52 #include <linux/dma-mapping.h>
53 #include <linux/mutex.h>
54 #include <linux/mempool.h>
55 #include <linux/uio.h>
57 #include <linux/socket.h>
59 #include <linux/in6.h>
61 #include <rdma/ib_verbs.h>
62 #include <rdma/ib_fmr_pool.h>
63 #include <rdma/rdma_cm.h>
65 #define DRV_NAME "iser"
66 #define PFX DRV_NAME ": "
68 #define DRV_DATE "May 7th, 2006"
70 #define iser_dbg(fmt, arg...) \
72 if (iser_debug_level > 1) \
73 printk(KERN_DEBUG PFX "%s:" fmt,\
77 #define iser_warn(fmt, arg...) \
79 if (iser_debug_level > 0) \
80 printk(KERN_DEBUG PFX "%s:" fmt,\
84 #define iser_err(fmt, arg...) \
86 printk(KERN_ERR PFX "%s:" fmt, \
91 #define SIZE_4K (1UL << SHIFT_4K)
92 #define MASK_4K (~(SIZE_4K-1))
94 /* support upto 512KB in one RDMA */
95 #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
96 #define ISER_DEF_CMD_PER_LUN 128
99 /* Maximal bounds on received asynchronous PDUs */
100 #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
102 #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
103 * SCSI_TMFUNC(2), LOGOUT(1) */
105 #define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
106 ISER_MAX_RX_MISC_PDUS + \
107 ISER_MAX_TX_MISC_PDUS)
109 /* the max TX (send) WR supported by the iSER QP is defined by *
110 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
111 * to have at max for SCSI command. The tx posting & completion handling code *
112 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
113 * send WR. D=8 comes from 64K/8K */
115 #define ISER_INFLIGHT_DATAOUTS 8
117 #define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
118 (1 + ISER_INFLIGHT_DATAOUTS) + \
119 ISER_MAX_TX_MISC_PDUS + \
120 ISER_MAX_RX_MISC_PDUS)
122 #define ISER_VER 0x10
123 #define ISER_WSV 0x08
124 #define ISER_RSV 0x04
129 __be32 write_stag; /* write rkey */
131 __be32 read_stag; /* read rkey */
133 } __attribute__((packed));
136 /* Length of an object name string */
137 #define ISER_OBJECT_NAME_SIZE 64
139 enum iser_ib_conn_state {
140 ISER_CONN_INIT, /* descriptor allocd, no conn */
141 ISER_CONN_PENDING, /* in the process of being established */
142 ISER_CONN_UP, /* up and running */
143 ISER_CONN_TERMINATING, /* in the process of being terminated */
144 ISER_CONN_DOWN, /* shut down */
148 enum iser_task_status {
149 ISER_TASK_STATUS_INIT = 0,
150 ISER_TASK_STATUS_STARTED,
151 ISER_TASK_STATUS_COMPLETED
155 ISER_DIR_IN = 0, /* to initiator */
156 ISER_DIR_OUT, /* from initiator */
160 struct iser_data_buf {
161 void *buf; /* pointer to the sg list */
162 unsigned int size; /* num entries of this sg */
163 unsigned long data_len; /* total data len */
164 unsigned int dma_nents; /* returned by dma_map_sg */
165 char *copy_buf; /* allocated copy buf for SGs unaligned *
166 * for rdma which are copied */
167 struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
171 /* fwd declarations */
173 struct iscsi_iser_conn;
174 struct iscsi_iser_task;
175 struct iscsi_endpoint;
177 struct iser_mem_reg {
186 struct iser_regd_buf {
187 struct iser_mem_reg reg; /* memory registration info */
189 struct iser_device *device; /* device->device for dma_unmap */
190 u64 dma_addr; /* if non zero, addr for dma_unmap */
191 enum dma_data_direction direction; /* direction for dma_unmap */
192 unsigned int data_size;
193 atomic_t ref_count; /* refcount, freed when dec to 0 */
196 #define MAX_REGD_BUF_VECTOR_LEN 2
199 struct iscsi_iser_task *task;
200 struct iser_conn *ib_conn;
203 /* vector of registered buffers */
204 unsigned int regd_vector_len;
205 struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
207 /* offset into the registered buffer may be specified */
208 unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
210 /* a smaller size may be specified, if 0, then full size is used */
211 unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
214 enum iser_desc_type {
217 ISCSI_TX_SCSI_COMMAND,
222 struct iser_hdr iser_header;
223 struct iscsi_hdr iscsi_header;
224 struct iser_regd_buf hdr_regd_buf;
225 void *data; /* used by RX & TX_CONTROL */
226 struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
227 enum iser_desc_type type;
232 struct ib_device *ib_device;
236 struct tasklet_struct cq_tasklet;
237 struct list_head ig_list; /* entry in ig devices list */
242 struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
243 struct iscsi_endpoint *ep;
244 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 atomic_t unexpected_pdu_count;/* count of received *
258 char name[ISER_OBJECT_NAME_SIZE];
259 struct iser_page_vec *page_vec; /* represents SG to fmr maps*
260 * maps serialized as tx is*/
261 struct list_head conn_list; /* entry in ig conn list */
264 struct iscsi_iser_conn {
265 struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
266 struct iser_conn *ib_conn; /* iSER IB conn */
269 struct iscsi_iser_task {
270 struct iser_desc desc;
271 struct iscsi_iser_conn *iser_conn;
272 enum iser_task_status status;
273 int command_sent; /* set if command sent */
274 int dir[ISER_DIRS_NUM]; /* set if dir use*/
275 struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
276 struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
277 struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
280 struct iser_page_vec {
288 struct mutex device_list_mutex;/* */
289 struct list_head device_list; /* all iSER devices */
290 struct mutex connlist_mutex;
291 struct list_head connlist; /* all iSER IB connections */
293 struct kmem_cache *desc_cache;
296 extern struct iser_global ig;
297 extern int iser_debug_level;
299 /* allocate connection resources needed for rdma functionality */
300 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
302 int iser_send_control(struct iscsi_conn *conn,
303 struct iscsi_task *task);
305 int iser_send_command(struct iscsi_conn *conn,
306 struct iscsi_task *task);
308 int iser_send_data_out(struct iscsi_conn *conn,
309 struct iscsi_task *task,
310 struct iscsi_data *hdr);
312 void iscsi_iser_recv(struct iscsi_conn *conn,
313 struct iscsi_hdr *hdr,
317 void iser_conn_init(struct iser_conn *ib_conn);
319 void iser_conn_get(struct iser_conn *ib_conn);
321 void iser_conn_put(struct iser_conn *ib_conn);
323 void iser_conn_terminate(struct iser_conn *ib_conn);
325 void iser_rcv_completion(struct iser_desc *desc,
326 unsigned long dto_xfer_len);
328 void iser_snd_completion(struct iser_desc *desc);
330 void iser_task_rdma_init(struct iscsi_iser_task *task);
332 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
334 void iser_dto_buffs_release(struct iser_dto *dto);
336 int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
338 void iser_reg_single(struct iser_device *device,
339 struct iser_regd_buf *regd_buf,
340 enum dma_data_direction direction);
342 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
343 enum iser_data_dir cmd_dir);
345 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
346 enum iser_data_dir cmd_dir);
348 int iser_connect(struct iser_conn *ib_conn,
349 struct sockaddr_in *src_addr,
350 struct sockaddr_in *dst_addr,
353 int iser_reg_page_vec(struct iser_conn *ib_conn,
354 struct iser_page_vec *page_vec,
355 struct iser_mem_reg *mem_reg);
357 void iser_unreg_mem(struct iser_mem_reg *mem_reg);
359 int iser_post_recv(struct iser_desc *rx_desc);
360 int iser_post_send(struct iser_desc *tx_desc);
362 int iser_conn_state_comp(struct iser_conn *ib_conn,
363 enum iser_ib_conn_state comp);
365 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
366 struct iser_data_buf *data,
367 enum iser_data_dir iser_dir,
368 enum dma_data_direction dma_dir);
370 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);