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  * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
12  *
13  * This software is available to you under a choice of one of two
14  * licenses.  You may choose to be licensed under the terms of the GNU
15  * General Public License (GPL) Version 2, available from the file
16  * COPYING in the main directory of this source tree, or the
17  * OpenIB.org BSD license below:
18  *
19  *     Redistribution and use in source and binary forms, with or
20  *     without modification, are permitted provided that the following
21  *     conditions are met:
22  *
23  *	- Redistributions of source code must retain the above
24  *	  copyright notice, this list of conditions and the following
25  *	  disclaimer.
26  *
27  *	- Redistributions in binary form must reproduce the above
28  *	  copyright notice, this list of conditions and the following
29  *	  disclaimer in the documentation and/or other materials
30  *	  provided with the distribution.
31  *
32  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
34  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
35  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
36  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
37  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
38  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
39  * SOFTWARE.
40  */
41 #ifndef __ISCSI_ISER_H__
42 #define __ISCSI_ISER_H__
43 
44 #include <linux/types.h>
45 #include <linux/net.h>
46 #include <linux/printk.h>
47 #include <scsi/libiscsi.h>
48 #include <scsi/scsi_transport_iscsi.h>
49 #include <scsi/scsi_cmnd.h>
50 #include <scsi/scsi_device.h>
51 #include <scsi/iser.h>
52 
53 #include <linux/interrupt.h>
54 #include <linux/wait.h>
55 #include <linux/sched.h>
56 #include <linux/list.h>
57 #include <linux/slab.h>
58 #include <linux/dma-mapping.h>
59 #include <linux/mutex.h>
60 #include <linux/mempool.h>
61 #include <linux/uio.h>
62 
63 #include <linux/socket.h>
64 #include <linux/in.h>
65 #include <linux/in6.h>
66 
67 #include <rdma/ib_verbs.h>
68 #include <rdma/ib_fmr_pool.h>
69 #include <rdma/rdma_cm.h>
70 
71 #define DRV_NAME	"iser"
72 #define PFX		DRV_NAME ": "
73 #define DRV_VER		"1.6"
74 
75 #define iser_dbg(fmt, arg...)				 \
76 	do {						 \
77 		if (unlikely(iser_debug_level > 2))	 \
78 			printk(KERN_DEBUG PFX "%s: " fmt,\
79 				__func__ , ## arg);	 \
80 	} while (0)
81 
82 #define iser_warn(fmt, arg...)				\
83 	do {						\
84 		if (unlikely(iser_debug_level > 0))	\
85 			pr_warn(PFX "%s: " fmt,		\
86 				__func__ , ## arg);	\
87 	} while (0)
88 
89 #define iser_info(fmt, arg...)				\
90 	do {						\
91 		if (unlikely(iser_debug_level > 1))	\
92 			pr_info(PFX "%s: " fmt,		\
93 				__func__ , ## arg);	\
94 	} while (0)
95 
96 #define iser_err(fmt, arg...) \
97 	pr_err(PFX "%s: " fmt, __func__ , ## arg)
98 
99 /* Default support is 512KB I/O size */
100 #define ISER_DEF_MAX_SECTORS		1024
101 #define ISCSI_ISER_DEF_SG_TABLESIZE                                            \
102 	((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
103 /* Maximum support is 16MB I/O size */
104 #define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
105 
106 #define ISER_DEF_XMIT_CMDS_DEFAULT		512
107 #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
108 	#define ISER_DEF_XMIT_CMDS_MAX		ISCSI_DEF_XMIT_CMDS_MAX
109 #else
110 	#define ISER_DEF_XMIT_CMDS_MAX		ISER_DEF_XMIT_CMDS_DEFAULT
111 #endif
112 #define ISER_DEF_CMD_PER_LUN		ISER_DEF_XMIT_CMDS_MAX
113 
114 /* QP settings */
115 /* Maximal bounds on received asynchronous PDUs */
116 #define ISER_MAX_RX_MISC_PDUS		4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
117 
118 #define ISER_MAX_TX_MISC_PDUS		6 /* NOOP_OUT(2), TEXT(1),         *
119 					   * SCSI_TMFUNC(2), LOGOUT(1) */
120 
121 #define ISER_QP_MAX_RECV_DTOS		(ISER_DEF_XMIT_CMDS_MAX)
122 
123 #define ISER_MIN_POSTED_RX		(ISER_DEF_XMIT_CMDS_MAX >> 2)
124 
125 /* the max TX (send) WR supported by the iSER QP is defined by                 *
126  * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
127  * to have at max for SCSI command. The tx posting & completion handling code  *
128  * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
129  * send WR. D=8 comes from 64K/8K                                              */
130 
131 #define ISER_INFLIGHT_DATAOUTS		8
132 
133 #define ISER_QP_MAX_REQ_DTOS		(ISER_DEF_XMIT_CMDS_MAX *    \
134 					(1 + ISER_INFLIGHT_DATAOUTS) + \
135 					ISER_MAX_TX_MISC_PDUS        + \
136 					ISER_MAX_RX_MISC_PDUS)
137 
138 /* Max registration work requests per command */
139 #define ISER_MAX_REG_WR_PER_CMD		5
140 
141 /* For Signature we don't support DATAOUTs so no need to make room for them */
142 #define ISER_QP_SIG_MAX_REQ_DTOS	(ISER_DEF_XMIT_CMDS_MAX	*       \
143 					(1 + ISER_MAX_REG_WR_PER_CMD) + \
144 					ISER_MAX_TX_MISC_PDUS         + \
145 					ISER_MAX_RX_MISC_PDUS)
146 
147 #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr			\
148 					 - ISER_MAX_TX_MISC_PDUS	\
149 					 - ISER_MAX_RX_MISC_PDUS) /	\
150 					 (1 + ISER_INFLIGHT_DATAOUTS))
151 
152 #define ISER_SIGNAL_CMD_COUNT 32
153 
154 /* Constant PDU lengths calculations */
155 #define ISER_HEADERS_LEN	(sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
156 
157 #define ISER_RECV_DATA_SEG_LEN	128
158 #define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
159 #define ISER_RX_LOGIN_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
160 
161 /* Length of an object name string */
162 #define ISER_OBJECT_NAME_SIZE		    64
163 
164 enum iser_conn_state {
165 	ISER_CONN_INIT,		   /* descriptor allocd, no conn          */
166 	ISER_CONN_PENDING,	   /* in the process of being established */
167 	ISER_CONN_UP,		   /* up and running                      */
168 	ISER_CONN_TERMINATING,	   /* in the process of being terminated  */
169 	ISER_CONN_DOWN,		   /* shut down                           */
170 	ISER_CONN_STATES_NUM
171 };
172 
173 enum iser_task_status {
174 	ISER_TASK_STATUS_INIT = 0,
175 	ISER_TASK_STATUS_STARTED,
176 	ISER_TASK_STATUS_COMPLETED
177 };
178 
179 enum iser_data_dir {
180 	ISER_DIR_IN = 0,	   /* to initiator */
181 	ISER_DIR_OUT,		   /* from initiator */
182 	ISER_DIRS_NUM
183 };
184 
185 /**
186  * struct iser_data_buf - iSER data buffer
187  *
188  * @sg:           pointer to the sg list
189  * @size:         num entries of this sg
190  * @data_len:     total beffer byte len
191  * @dma_nents:    returned by dma_map_sg
192  */
193 struct iser_data_buf {
194 	struct scatterlist *sg;
195 	int                size;
196 	unsigned long      data_len;
197 	int                dma_nents;
198 };
199 
200 /* fwd declarations */
201 struct iser_device;
202 struct iscsi_iser_task;
203 struct iscsi_endpoint;
204 struct iser_reg_resources;
205 
206 /**
207  * struct iser_mem_reg - iSER memory registration info
208  *
209  * @sge:          memory region sg element
210  * @rkey:         memory region remote key
211  * @mem_h:        pointer to registration context (FMR/Fastreg)
212  */
213 struct iser_mem_reg {
214 	struct ib_sge	 sge;
215 	u32		 rkey;
216 	void		*mem_h;
217 };
218 
219 enum iser_desc_type {
220 	ISCSI_TX_CONTROL ,
221 	ISCSI_TX_SCSI_COMMAND,
222 	ISCSI_TX_DATAOUT
223 };
224 
225 /**
226  * struct iser_tx_desc - iSER TX descriptor
227  *
228  * @iser_header:   iser header
229  * @iscsi_header:  iscsi header
230  * @type:          command/control/dataout
231  * @dma_addr:      header buffer dma_address
232  * @tx_sg:         sg[0] points to iser/iscsi headers
233  *                 sg[1] optionally points to either of immediate data
234  *                 unsolicited data-out or control
235  * @num_sge:       number sges used on this TX task
236  * @cqe:           completion handler
237  * @mapped:        Is the task header mapped
238  * @reg_wr:        registration WR
239  * @send_wr:       send WR
240  * @inv_wr:        invalidate WR
241  */
242 struct iser_tx_desc {
243 	struct iser_ctrl             iser_header;
244 	struct iscsi_hdr             iscsi_header;
245 	enum   iser_desc_type        type;
246 	u64		             dma_addr;
247 	struct ib_sge		     tx_sg[2];
248 	int                          num_sge;
249 	struct ib_cqe		     cqe;
250 	bool			     mapped;
251 	struct ib_reg_wr	     reg_wr;
252 	struct ib_send_wr	     send_wr;
253 	struct ib_send_wr	     inv_wr;
254 };
255 
256 #define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
257 				 sizeof(u64) + sizeof(struct ib_sge) + \
258 				 sizeof(struct ib_cqe)))
259 /**
260  * struct iser_rx_desc - iSER RX descriptor
261  *
262  * @iser_header:   iser header
263  * @iscsi_header:  iscsi header
264  * @data:          received data segment
265  * @dma_addr:      receive buffer dma address
266  * @rx_sg:         ib_sge of receive buffer
267  * @cqe:           completion handler
268  * @pad:           for sense data TODO: Modify to maximum sense length supported
269  */
270 struct iser_rx_desc {
271 	struct iser_ctrl             iser_header;
272 	struct iscsi_hdr             iscsi_header;
273 	char		             data[ISER_RECV_DATA_SEG_LEN];
274 	u64		             dma_addr;
275 	struct ib_sge		     rx_sg;
276 	struct ib_cqe		     cqe;
277 	char		             pad[ISER_RX_PAD_SIZE];
278 } __packed;
279 
280 /**
281  * struct iser_login_desc - iSER login descriptor
282  *
283  * @req:           pointer to login request buffer
284  * @rsp:           pointer to login response buffer
285  * @req_dma:       DMA address of login request buffer
286  * @rsp_dma:       DMA address of login response buffer
287  * @sge:           IB sge for login post recv
288  * @cqe:           completion handler
289  */
290 struct iser_login_desc {
291 	void                         *req;
292 	void                         *rsp;
293 	u64                          req_dma;
294 	u64                          rsp_dma;
295 	struct ib_sge                sge;
296 	struct ib_cqe		     cqe;
297 } __packed;
298 
299 struct iser_conn;
300 struct ib_conn;
301 struct iscsi_iser_task;
302 
303 /**
304  * struct iser_comp - iSER completion context
305  *
306  * @cq:         completion queue
307  * @active_qps: Number of active QPs attached
308  *              to completion context
309  */
310 struct iser_comp {
311 	struct ib_cq		*cq;
312 	int                      active_qps;
313 };
314 
315 /**
316  * struct iser_reg_ops - Memory registration operations
317  *     per-device registration schemes
318  *
319  * @alloc_reg_res:     Allocate registration resources
320  * @free_reg_res:      Free registration resources
321  * @reg_mem:           Register memory buffers
322  * @unreg_mem:         Un-register memory buffers
323  * @reg_desc_get:      Get a registration descriptor for pool
324  * @reg_desc_put:      Get a registration descriptor to pool
325  */
326 struct iser_reg_ops {
327 	int            (*alloc_reg_res)(struct ib_conn *ib_conn,
328 					unsigned cmds_max,
329 					unsigned int size);
330 	void           (*free_reg_res)(struct ib_conn *ib_conn);
331 	int            (*reg_mem)(struct iscsi_iser_task *iser_task,
332 				  struct iser_data_buf *mem,
333 				  struct iser_reg_resources *rsc,
334 				  struct iser_mem_reg *reg);
335 	void           (*unreg_mem)(struct iscsi_iser_task *iser_task,
336 				    enum iser_data_dir cmd_dir);
337 	struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn);
338 	void           (*reg_desc_put)(struct ib_conn *ib_conn,
339 				       struct iser_fr_desc *desc);
340 };
341 
342 /**
343  * struct iser_device - iSER device handle
344  *
345  * @ib_device:     RDMA device
346  * @pd:            Protection Domain for this device
347  * @mr:            Global DMA memory region
348  * @event_handler: IB events handle routine
349  * @ig_list:	   entry in devices list
350  * @refcount:      Reference counter, dominated by open iser connections
351  * @comps_used:    Number of completion contexts used, Min between online
352  *                 cpus and device max completion vectors
353  * @comps:         Dinamically allocated array of completion handlers
354  * @reg_ops:       Registration ops
355  * @remote_inv_sup: Remote invalidate is supported on this device
356  */
357 struct iser_device {
358 	struct ib_device             *ib_device;
359 	struct ib_pd	             *pd;
360 	struct ib_event_handler      event_handler;
361 	struct list_head             ig_list;
362 	int                          refcount;
363 	int			     comps_used;
364 	struct iser_comp	     *comps;
365 	const struct iser_reg_ops    *reg_ops;
366 	bool                         remote_inv_sup;
367 };
368 
369 /**
370  * struct iser_reg_resources - Fast registration resources
371  *
372  * @mr:         memory region
373  * @fmr_pool:   pool of fmrs
374  * @sig_mr:     signature memory region
375  * @page_vec:   fast reg page list used by fmr pool
376  * @mr_valid:   is mr valid indicator
377  */
378 struct iser_reg_resources {
379 	union {
380 		struct ib_mr             *mr;
381 		struct ib_fmr_pool       *fmr_pool;
382 	};
383 	struct ib_mr                     *sig_mr;
384 	struct iser_page_vec             *page_vec;
385 	u8				  mr_valid:1;
386 };
387 
388 /**
389  * struct iser_fr_desc - Fast registration descriptor
390  *
391  * @list:           entry in connection fastreg pool
392  * @rsc:            data buffer registration resources
393  * @sig_protected:  is region protected indicator
394  */
395 struct iser_fr_desc {
396 	struct list_head		  list;
397 	struct iser_reg_resources	  rsc;
398 	bool				  sig_protected;
399 	struct list_head                  all_list;
400 };
401 
402 /**
403  * struct iser_fr_pool - connection fast registration pool
404  *
405  * @list:                list of fastreg descriptors
406  * @lock:                protects fmr/fastreg pool
407  * @size:                size of the pool
408  */
409 struct iser_fr_pool {
410 	struct list_head        list;
411 	spinlock_t              lock;
412 	int                     size;
413 	struct list_head        all_list;
414 };
415 
416 /**
417  * struct ib_conn - Infiniband related objects
418  *
419  * @cma_id:              rdma_cm connection maneger handle
420  * @qp:                  Connection Queue-pair
421  * @post_recv_buf_count: post receive counter
422  * @sig_count:           send work request signal count
423  * @rx_wr:               receive work request for batch posts
424  * @device:              reference to iser device
425  * @comp:                iser completion context
426  * @fr_pool:             connection fast registration poool
427  * @pi_support:          Indicate device T10-PI support
428  * @reg_cqe:             completion handler
429  */
430 struct ib_conn {
431 	struct rdma_cm_id           *cma_id;
432 	struct ib_qp	            *qp;
433 	int                          post_recv_buf_count;
434 	u8                           sig_count;
435 	struct ib_recv_wr	     rx_wr[ISER_MIN_POSTED_RX];
436 	struct iser_device          *device;
437 	struct iser_comp	    *comp;
438 	struct iser_fr_pool          fr_pool;
439 	bool			     pi_support;
440 	struct ib_cqe		     reg_cqe;
441 };
442 
443 /**
444  * struct iser_conn - iSER connection context
445  *
446  * @ib_conn:          connection RDMA resources
447  * @iscsi_conn:       link to matching iscsi connection
448  * @ep:               transport handle
449  * @state:            connection logical state
450  * @qp_max_recv_dtos: maximum number of data outs, corresponds
451  *                    to max number of post recvs
452  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
453  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
454  * @max_cmds:         maximum cmds allowed for this connection
455  * @name:             connection peer portal
456  * @release_work:     deffered work for release job
457  * @state_mutex:      protects iser onnection state
458  * @stop_completion:  conn_stop completion
459  * @ib_completion:    RDMA cleanup completion
460  * @up_completion:    connection establishment completed
461  *                    (state is ISER_CONN_UP)
462  * @conn_list:        entry in ig conn list
463  * @login_desc:       login descriptor
464  * @rx_desc_head:     head of rx_descs cyclic buffer
465  * @rx_descs:         rx buffers array (cyclic buffer)
466  * @num_rx_descs:     number of rx descriptors
467  * @scsi_sg_tablesize: scsi host sg_tablesize
468  * @pages_per_mr:     maximum pages available for registration
469  * @snd_w_inv:        connection uses remote invalidation
470  */
471 struct iser_conn {
472 	struct ib_conn		     ib_conn;
473 	struct iscsi_conn	     *iscsi_conn;
474 	struct iscsi_endpoint	     *ep;
475 	enum iser_conn_state	     state;
476 	unsigned		     qp_max_recv_dtos;
477 	unsigned		     qp_max_recv_dtos_mask;
478 	unsigned		     min_posted_rx;
479 	u16                          max_cmds;
480 	char 			     name[ISER_OBJECT_NAME_SIZE];
481 	struct work_struct	     release_work;
482 	struct mutex		     state_mutex;
483 	struct completion	     stop_completion;
484 	struct completion	     ib_completion;
485 	struct completion	     up_completion;
486 	struct list_head	     conn_list;
487 	struct iser_login_desc       login_desc;
488 	unsigned int 		     rx_desc_head;
489 	struct iser_rx_desc	     *rx_descs;
490 	u32                          num_rx_descs;
491 	unsigned short               scsi_sg_tablesize;
492 	unsigned short               pages_per_mr;
493 	bool			     snd_w_inv;
494 };
495 
496 /**
497  * struct iscsi_iser_task - iser task context
498  *
499  * @desc:     TX descriptor
500  * @iser_conn:        link to iser connection
501  * @status:           current task status
502  * @sc:               link to scsi command
503  * @command_sent:     indicate if command was sent
504  * @dir:              iser data direction
505  * @rdma_reg:         task rdma registration desc
506  * @data:             iser data buffer desc
507  * @prot:             iser protection buffer desc
508  */
509 struct iscsi_iser_task {
510 	struct iser_tx_desc          desc;
511 	struct iser_conn	     *iser_conn;
512 	enum iser_task_status 	     status;
513 	struct scsi_cmnd	     *sc;
514 	int                          command_sent;
515 	int                          dir[ISER_DIRS_NUM];
516 	struct iser_mem_reg          rdma_reg[ISER_DIRS_NUM];
517 	struct iser_data_buf         data[ISER_DIRS_NUM];
518 	struct iser_data_buf         prot[ISER_DIRS_NUM];
519 };
520 
521 struct iser_page_vec {
522 	u64 *pages;
523 	int npages;
524 	struct ib_mr fake_mr;
525 };
526 
527 /**
528  * struct iser_global - iSER global context
529  *
530  * @device_list_mutex:    protects device_list
531  * @device_list:          iser devices global list
532  * @connlist_mutex:       protects connlist
533  * @connlist:             iser connections global list
534  * @desc_cache:           kmem cache for tx dataout
535  */
536 struct iser_global {
537 	struct mutex      device_list_mutex;
538 	struct list_head  device_list;
539 	struct mutex      connlist_mutex;
540 	struct list_head  connlist;
541 	struct kmem_cache *desc_cache;
542 };
543 
544 extern struct iser_global ig;
545 extern int iser_debug_level;
546 extern bool iser_pi_enable;
547 extern int iser_pi_guard;
548 extern unsigned int iser_max_sectors;
549 extern bool iser_always_reg;
550 
551 int iser_assign_reg_ops(struct iser_device *device);
552 
553 int iser_send_control(struct iscsi_conn *conn,
554 		      struct iscsi_task *task);
555 
556 int iser_send_command(struct iscsi_conn *conn,
557 		      struct iscsi_task *task);
558 
559 int iser_send_data_out(struct iscsi_conn *conn,
560 		       struct iscsi_task *task,
561 		       struct iscsi_data *hdr);
562 
563 void iscsi_iser_recv(struct iscsi_conn *conn,
564 		     struct iscsi_hdr *hdr,
565 		     char *rx_data,
566 		     int rx_data_len);
567 
568 void iser_conn_init(struct iser_conn *iser_conn);
569 
570 void iser_conn_release(struct iser_conn *iser_conn);
571 
572 int iser_conn_terminate(struct iser_conn *iser_conn);
573 
574 void iser_release_work(struct work_struct *work);
575 
576 void iser_err_comp(struct ib_wc *wc, const char *type);
577 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
578 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
579 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
580 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
581 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
582 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
583 
584 void iser_task_rdma_init(struct iscsi_iser_task *task);
585 
586 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
587 
588 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
589 
590 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
591 				     struct iser_data_buf *mem,
592 				     enum iser_data_dir cmd_dir);
593 
594 int iser_reg_rdma_mem(struct iscsi_iser_task *task,
595 		      enum iser_data_dir dir,
596 		      bool all_imm);
597 void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
598 			 enum iser_data_dir dir);
599 
600 int  iser_connect(struct iser_conn *iser_conn,
601 		  struct sockaddr *src_addr,
602 		  struct sockaddr *dst_addr,
603 		  int non_blocking);
604 
605 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
606 			enum iser_data_dir cmd_dir);
607 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
608 			    enum iser_data_dir cmd_dir);
609 
610 int  iser_post_recvl(struct iser_conn *iser_conn);
611 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
612 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
613 		    bool signal);
614 
615 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
616 			   struct iser_data_buf *data,
617 			   enum iser_data_dir iser_dir,
618 			   enum dma_data_direction dma_dir);
619 
620 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
621 			      struct iser_data_buf *data,
622 			      enum dma_data_direction dir);
623 
624 int  iser_initialize_task_headers(struct iscsi_task *task,
625 			struct iser_tx_desc *tx_desc);
626 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
627 			      struct iscsi_session *session);
628 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
629 			unsigned cmds_max,
630 			unsigned int size);
631 void iser_free_fmr_pool(struct ib_conn *ib_conn);
632 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
633 			    unsigned cmds_max,
634 			    unsigned int size);
635 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
636 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
637 			     enum iser_data_dir cmd_dir, sector_t *sector);
638 struct iser_fr_desc *
639 iser_reg_desc_get_fr(struct ib_conn *ib_conn);
640 void
641 iser_reg_desc_put_fr(struct ib_conn *ib_conn,
642 		     struct iser_fr_desc *desc);
643 struct iser_fr_desc *
644 iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
645 void
646 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
647 		      struct iser_fr_desc *desc);
648 
649 static inline struct iser_conn *
650 to_iser_conn(struct ib_conn *ib_conn)
651 {
652 	return container_of(ib_conn, struct iser_conn, ib_conn);
653 }
654 
655 static inline struct iser_rx_desc *
656 iser_rx(struct ib_cqe *cqe)
657 {
658 	return container_of(cqe, struct iser_rx_desc, cqe);
659 }
660 
661 static inline struct iser_tx_desc *
662 iser_tx(struct ib_cqe *cqe)
663 {
664 	return container_of(cqe, struct iser_tx_desc, cqe);
665 }
666 
667 static inline struct iser_login_desc *
668 iser_login(struct ib_cqe *cqe)
669 {
670 	return container_of(cqe, struct iser_login_desc, cqe);
671 }
672 
673 #endif
674