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 
52 #include <linux/interrupt.h>
53 #include <linux/wait.h>
54 #include <linux/sched.h>
55 #include <linux/list.h>
56 #include <linux/slab.h>
57 #include <linux/dma-mapping.h>
58 #include <linux/mutex.h>
59 #include <linux/mempool.h>
60 #include <linux/uio.h>
61 
62 #include <linux/socket.h>
63 #include <linux/in.h>
64 #include <linux/in6.h>
65 
66 #include <rdma/ib_verbs.h>
67 #include <rdma/ib_fmr_pool.h>
68 #include <rdma/rdma_cm.h>
69 
70 #define DRV_NAME	"iser"
71 #define PFX		DRV_NAME ": "
72 #define DRV_VER		"1.4.8"
73 
74 #define iser_dbg(fmt, arg...)				 \
75 	do {						 \
76 		if (iser_debug_level > 2)		 \
77 			printk(KERN_DEBUG PFX "%s: " fmt,\
78 				__func__ , ## arg);	 \
79 	} while (0)
80 
81 #define iser_warn(fmt, arg...)				\
82 	do {						\
83 		if (iser_debug_level > 0)		\
84 			pr_warn(PFX "%s: " fmt,		\
85 				__func__ , ## arg);	\
86 	} while (0)
87 
88 #define iser_info(fmt, arg...)				\
89 	do {						\
90 		if (iser_debug_level > 1)		\
91 			pr_info(PFX "%s: " fmt,		\
92 				__func__ , ## arg);	\
93 	} while (0)
94 
95 #define iser_err(fmt, arg...)				\
96 	do {						\
97 		printk(KERN_ERR PFX "%s: " fmt,		\
98 		       __func__ , ## arg);		\
99 	} while (0)
100 
101 #define SHIFT_4K	12
102 #define SIZE_4K	(1ULL << SHIFT_4K)
103 #define MASK_4K	(~(SIZE_4K-1))
104 					/* support up to 512KB in one RDMA */
105 #define ISCSI_ISER_SG_TABLESIZE         (0x80000 >> SHIFT_4K)
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_WC_BATCH_COUNT   16
148 #define ISER_SIGNAL_CMD_COUNT 32
149 
150 #define ISER_VER			0x10
151 #define ISER_WSV			0x08
152 #define ISER_RSV			0x04
153 
154 #define ISER_FASTREG_LI_WRID		0xffffffffffffffffULL
155 #define ISER_BEACON_WRID		0xfffffffffffffffeULL
156 
157 /**
158  * struct iser_hdr - iSER header
159  *
160  * @flags:        flags support (zbva, remote_inv)
161  * @rsvd:         reserved
162  * @write_stag:   write rkey
163  * @write_va:     write virtual address
164  * @reaf_stag:    read rkey
165  * @read_va:      read virtual address
166  */
167 struct iser_hdr {
168 	u8      flags;
169 	u8      rsvd[3];
170 	__be32  write_stag;
171 	__be64  write_va;
172 	__be32  read_stag;
173 	__be64  read_va;
174 } __attribute__((packed));
175 
176 
177 #define ISER_ZBVA_NOT_SUPPORTED		0x80
178 #define ISER_SEND_W_INV_NOT_SUPPORTED	0x40
179 
180 struct iser_cm_hdr {
181 	u8      flags;
182 	u8      rsvd[3];
183 } __packed;
184 
185 /* Constant PDU lengths calculations */
186 #define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
187 
188 #define ISER_RECV_DATA_SEG_LEN	128
189 #define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
190 #define ISER_RX_LOGIN_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
191 
192 /* Length of an object name string */
193 #define ISER_OBJECT_NAME_SIZE		    64
194 
195 enum iser_conn_state {
196 	ISER_CONN_INIT,		   /* descriptor allocd, no conn          */
197 	ISER_CONN_PENDING,	   /* in the process of being established */
198 	ISER_CONN_UP,		   /* up and running                      */
199 	ISER_CONN_TERMINATING,	   /* in the process of being terminated  */
200 	ISER_CONN_DOWN,		   /* shut down                           */
201 	ISER_CONN_STATES_NUM
202 };
203 
204 enum iser_task_status {
205 	ISER_TASK_STATUS_INIT = 0,
206 	ISER_TASK_STATUS_STARTED,
207 	ISER_TASK_STATUS_COMPLETED
208 };
209 
210 enum iser_data_dir {
211 	ISER_DIR_IN = 0,	   /* to initiator */
212 	ISER_DIR_OUT,		   /* from initiator */
213 	ISER_DIRS_NUM
214 };
215 
216 /**
217  * struct iser_data_buf - iSER data buffer
218  *
219  * @buf:          pointer to the sg list
220  * @size:         num entries of this sg
221  * @data_len:     total beffer byte len
222  * @dma_nents:    returned by dma_map_sg
223  * @copy_buf:     allocated copy buf for SGs unaligned
224  *                for rdma which are copied
225  * @sg_single:    SG-ified clone of a non SG SC or
226  *                unaligned SG
227  */
228 struct iser_data_buf {
229 	void               *buf;
230 	unsigned int       size;
231 	unsigned long      data_len;
232 	unsigned int       dma_nents;
233 	char               *copy_buf;
234 	struct scatterlist sg_single;
235   };
236 
237 /* fwd declarations */
238 struct iser_device;
239 struct iscsi_iser_task;
240 struct iscsi_endpoint;
241 
242 /**
243  * struct iser_mem_reg - iSER memory registration info
244  *
245  * @lkey:         MR local key
246  * @rkey:         MR remote key
247  * @va:           MR start address (buffer va)
248  * @len:          MR length
249  * @mem_h:        pointer to registration context (FMR/Fastreg)
250  * @is_mr:        indicates weather we registered the buffer
251  */
252 struct iser_mem_reg {
253 	u32  lkey;
254 	u32  rkey;
255 	u64  va;
256 	u64  len;
257 	void *mem_h;
258 	int  is_mr;
259 };
260 
261 /**
262  * struct iser_regd_buf - iSER buffer registration desc
263  *
264  * @reg:          memory registration info
265  * @virt_addr:    virtual address of buffer
266  * @device:       reference to iser device
267  * @direction:    dma direction (for dma_unmap)
268  * @data_size:    data buffer size in bytes
269  */
270 struct iser_regd_buf {
271 	struct iser_mem_reg     reg;
272 	void                    *virt_addr;
273 	struct iser_device      *device;
274 	enum dma_data_direction direction;
275 	unsigned int            data_size;
276 };
277 
278 enum iser_desc_type {
279 	ISCSI_TX_CONTROL ,
280 	ISCSI_TX_SCSI_COMMAND,
281 	ISCSI_TX_DATAOUT
282 };
283 
284 /**
285  * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
286  *
287  * @iser_header:   iser header
288  * @iscsi_header:  iscsi header
289  * @type:          command/control/dataout
290  * @dam_addr:      header buffer dma_address
291  * @tx_sg:         sg[0] points to iser/iscsi headers
292  *                 sg[1] optionally points to either of immediate data
293  *                 unsolicited data-out or control
294  * @num_sge:       number sges used on this TX task
295  */
296 struct iser_tx_desc {
297 	struct iser_hdr              iser_header;
298 	struct iscsi_hdr             iscsi_header;
299 	enum   iser_desc_type        type;
300 	u64		             dma_addr;
301 	struct ib_sge		     tx_sg[2];
302 	int                          num_sge;
303 };
304 
305 #define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
306 					sizeof(u64) + sizeof(struct ib_sge)))
307 /**
308  * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
309  *
310  * @iser_header:   iser header
311  * @iscsi_header:  iscsi header
312  * @data:          received data segment
313  * @dma_addr:      receive buffer dma address
314  * @rx_sg:         ib_sge of receive buffer
315  * @pad:           for sense data TODO: Modify to maximum sense length supported
316  */
317 struct iser_rx_desc {
318 	struct iser_hdr              iser_header;
319 	struct iscsi_hdr             iscsi_header;
320 	char		             data[ISER_RECV_DATA_SEG_LEN];
321 	u64		             dma_addr;
322 	struct ib_sge		     rx_sg;
323 	char		             pad[ISER_RX_PAD_SIZE];
324 } __attribute__((packed));
325 
326 #define ISER_MAX_CQ 4
327 
328 struct iser_conn;
329 struct ib_conn;
330 struct iscsi_iser_task;
331 
332 /**
333  * struct iser_comp - iSER completion context
334  *
335  * @device:     pointer to device handle
336  * @cq:         completion queue
337  * @wcs:        work completion array
338  * @tasklet:    Tasklet handle
339  * @active_qps: Number of active QPs attached
340  *              to completion context
341  */
342 struct iser_comp {
343 	struct iser_device      *device;
344 	struct ib_cq		*cq;
345 	struct ib_wc		 wcs[ISER_WC_BATCH_COUNT];
346 	struct tasklet_struct	 tasklet;
347 	int                      active_qps;
348 };
349 
350 /**
351  * struct iser_device - iSER device handle
352  *
353  * @ib_device:     RDMA device
354  * @pd:            Protection Domain for this device
355  * @dev_attr:      Device attributes container
356  * @mr:            Global DMA memory region
357  * @event_handler: IB events handle routine
358  * @ig_list:	   entry in devices list
359  * @refcount:      Reference counter, dominated by open iser connections
360  * @comps_used:    Number of completion contexts used, Min between online
361  *                 cpus and device max completion vectors
362  * @comps:         Dinamically allocated array of completion handlers
363  * Memory registration pool Function pointers (FMR or Fastreg):
364  *     @iser_alloc_rdma_reg_res: Allocation of memory regions pool
365  *     @iser_free_rdma_reg_res:  Free of memory regions pool
366  *     @iser_reg_rdma_mem:       Memory registration routine
367  *     @iser_unreg_rdma_mem:     Memory deregistration routine
368  */
369 struct iser_device {
370 	struct ib_device             *ib_device;
371 	struct ib_pd	             *pd;
372 	struct ib_device_attr	     dev_attr;
373 	struct ib_mr	             *mr;
374 	struct ib_event_handler      event_handler;
375 	struct list_head             ig_list;
376 	int                          refcount;
377 	int			     comps_used;
378 	struct iser_comp	     comps[ISER_MAX_CQ];
379 	int                          (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn,
380 								unsigned cmds_max);
381 	void                         (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn);
382 	int                          (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task,
383 							  enum iser_data_dir cmd_dir);
384 	void                         (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
385 							    enum iser_data_dir cmd_dir);
386 };
387 
388 #define ISER_CHECK_GUARD	0xc0
389 #define ISER_CHECK_REFTAG	0x0f
390 #define ISER_CHECK_APPTAG	0x30
391 
392 enum iser_reg_indicator {
393 	ISER_DATA_KEY_VALID	= 1 << 0,
394 	ISER_PROT_KEY_VALID	= 1 << 1,
395 	ISER_SIG_KEY_VALID	= 1 << 2,
396 	ISER_FASTREG_PROTECTED	= 1 << 3,
397 };
398 
399 /**
400  * struct iser_pi_context - Protection information context
401  *
402  * @prot_mr:        protection memory region
403  * @prot_frpl:      protection fastreg page list
404  * @sig_mr:         signature feature enabled memory region
405  */
406 struct iser_pi_context {
407 	struct ib_mr                   *prot_mr;
408 	struct ib_fast_reg_page_list   *prot_frpl;
409 	struct ib_mr                   *sig_mr;
410 };
411 
412 /**
413  * struct fast_reg_descriptor - Fast registration descriptor
414  *
415  * @list:           entry in connection fastreg pool
416  * @data_mr:        data memory region
417  * @data_frpl:      data fastreg page list
418  * @pi_ctx:         protection information context
419  * @reg_indicators: fast registration indicators
420  */
421 struct fast_reg_descriptor {
422 	struct list_head		  list;
423 	struct ib_mr			 *data_mr;
424 	struct ib_fast_reg_page_list     *data_frpl;
425 	struct iser_pi_context		 *pi_ctx;
426 	u8				  reg_indicators;
427 };
428 
429 /**
430  * struct ib_conn - Infiniband related objects
431  *
432  * @cma_id:              rdma_cm connection maneger handle
433  * @qp:                  Connection Queue-pair
434  * @post_recv_buf_count: post receive counter
435  * @rx_wr:               receive work request for batch posts
436  * @device:              reference to iser device
437  * @comp:                iser completion context
438  * @pi_support:          Indicate device T10-PI support
439  * @beacon:              beacon send wr to signal all flush errors were drained
440  * @flush_comp:          completes when all connection completions consumed
441  * @lock:                protects fmr/fastreg pool
442  * @union.fmr:
443  *     @pool:            FMR pool for fast registrations
444  *     @page_vec:        page vector to hold mapped commands pages
445  *                       used for registration
446  * @union.fastreg:
447  *     @pool:            Fast registration descriptors pool for fast
448  *                       registrations
449  *     @pool_size:       Size of pool
450  */
451 struct ib_conn {
452 	struct rdma_cm_id           *cma_id;
453 	struct ib_qp	            *qp;
454 	int                          post_recv_buf_count;
455 	struct ib_recv_wr	     rx_wr[ISER_MIN_POSTED_RX];
456 	struct iser_device          *device;
457 	struct iser_comp	    *comp;
458 	bool			     pi_support;
459 	struct ib_send_wr	     beacon;
460 	struct completion	     flush_comp;
461 	spinlock_t		     lock;
462 	union {
463 		struct {
464 			struct ib_fmr_pool      *pool;
465 			struct iser_page_vec	*page_vec;
466 		} fmr;
467 		struct {
468 			struct list_head	 pool;
469 			int			 pool_size;
470 		} fastreg;
471 	};
472 };
473 
474 /**
475  * struct iser_conn - iSER connection context
476  *
477  * @ib_conn:          connection RDMA resources
478  * @iscsi_conn:       link to matching iscsi connection
479  * @ep:               transport handle
480  * @state:            connection logical state
481  * @qp_max_recv_dtos: maximum number of data outs, corresponds
482  *                    to max number of post recvs
483  * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
484  * @min_posted_rx:    (qp_max_recv_dtos >> 2)
485  * @name:             connection peer portal
486  * @release_work:     deffered work for release job
487  * @state_mutex:      protects iser onnection state
488  * @stop_completion:  conn_stop completion
489  * @ib_completion:    RDMA cleanup completion
490  * @up_completion:    connection establishment completed
491  *                    (state is ISER_CONN_UP)
492  * @conn_list:        entry in ig conn list
493  * @login_buf:        login data buffer (stores login parameters)
494  * @login_req_buf:    login request buffer
495  * @login_req_dma:    login request buffer dma address
496  * @login_resp_buf:   login response buffer
497  * @login_resp_dma:   login response buffer dma address
498  * @rx_desc_head:     head of rx_descs cyclic buffer
499  * @rx_descs:         rx buffers array (cyclic buffer)
500  * @num_rx_descs:     number of rx descriptors
501  */
502 struct iser_conn {
503 	struct ib_conn		     ib_conn;
504 	struct iscsi_conn	     *iscsi_conn;
505 	struct iscsi_endpoint	     *ep;
506 	enum iser_conn_state	     state;
507 	unsigned		     qp_max_recv_dtos;
508 	unsigned		     qp_max_recv_dtos_mask;
509 	unsigned		     min_posted_rx;
510 	char 			     name[ISER_OBJECT_NAME_SIZE];
511 	struct work_struct	     release_work;
512 	struct mutex		     state_mutex;
513 	struct completion	     stop_completion;
514 	struct completion	     ib_completion;
515 	struct completion	     up_completion;
516 	struct list_head	     conn_list;
517 
518 	char  			     *login_buf;
519 	char			     *login_req_buf, *login_resp_buf;
520 	u64			     login_req_dma, login_resp_dma;
521 	unsigned int 		     rx_desc_head;
522 	struct iser_rx_desc	     *rx_descs;
523 	u32                          num_rx_descs;
524 };
525 
526 /**
527  * struct iscsi_iser_task - iser task context
528  *
529  * @desc:     TX descriptor
530  * @iser_conn:        link to iser connection
531  * @status:           current task status
532  * @sc:               link to scsi command
533  * @command_sent:     indicate if command was sent
534  * @dir:              iser data direction
535  * @rdma_regd:        task rdma registration desc
536  * @data:             iser data buffer desc
537  * @data_copy:        iser data copy buffer desc (bounce buffer)
538  * @prot:             iser protection buffer desc
539  * @prot_copy:        iser protection copy buffer desc (bounce buffer)
540  */
541 struct iscsi_iser_task {
542 	struct iser_tx_desc          desc;
543 	struct iser_conn	     *iser_conn;
544 	enum iser_task_status 	     status;
545 	struct scsi_cmnd	     *sc;
546 	int                          command_sent;
547 	int                          dir[ISER_DIRS_NUM];
548 	struct iser_regd_buf         rdma_regd[ISER_DIRS_NUM];
549 	struct iser_data_buf         data[ISER_DIRS_NUM];
550 	struct iser_data_buf         data_copy[ISER_DIRS_NUM];
551 	struct iser_data_buf         prot[ISER_DIRS_NUM];
552 	struct iser_data_buf         prot_copy[ISER_DIRS_NUM];
553 };
554 
555 struct iser_page_vec {
556 	u64 *pages;
557 	int length;
558 	int offset;
559 	int data_size;
560 };
561 
562 /**
563  * struct iser_global: iSER global context
564  *
565  * @device_list_mutex:    protects device_list
566  * @device_list:          iser devices global list
567  * @connlist_mutex:       protects connlist
568  * @connlist:             iser connections global list
569  * @desc_cache:           kmem cache for tx dataout
570  */
571 struct iser_global {
572 	struct mutex      device_list_mutex;
573 	struct list_head  device_list;
574 	struct mutex      connlist_mutex;
575 	struct list_head  connlist;
576 	struct kmem_cache *desc_cache;
577 };
578 
579 extern struct iser_global ig;
580 extern int iser_debug_level;
581 extern bool iser_pi_enable;
582 extern int iser_pi_guard;
583 
584 int iser_send_control(struct iscsi_conn *conn,
585 		      struct iscsi_task *task);
586 
587 int iser_send_command(struct iscsi_conn *conn,
588 		      struct iscsi_task *task);
589 
590 int iser_send_data_out(struct iscsi_conn *conn,
591 		       struct iscsi_task *task,
592 		       struct iscsi_data *hdr);
593 
594 void iscsi_iser_recv(struct iscsi_conn *conn,
595 		     struct iscsi_hdr *hdr,
596 		     char *rx_data,
597 		     int rx_data_len);
598 
599 void iser_conn_init(struct iser_conn *iser_conn);
600 
601 void iser_conn_release(struct iser_conn *iser_conn);
602 
603 int iser_conn_terminate(struct iser_conn *iser_conn);
604 
605 void iser_release_work(struct work_struct *work);
606 
607 void iser_rcv_completion(struct iser_rx_desc *desc,
608 			 unsigned long dto_xfer_len,
609 			 struct ib_conn *ib_conn);
610 
611 void iser_snd_completion(struct iser_tx_desc *desc,
612 			 struct ib_conn *ib_conn);
613 
614 void iser_task_rdma_init(struct iscsi_iser_task *task);
615 
616 void iser_task_rdma_finalize(struct iscsi_iser_task *task);
617 
618 void iser_free_rx_descriptors(struct iser_conn *iser_conn);
619 
620 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
621 				     struct iser_data_buf *mem,
622 				     struct iser_data_buf *mem_copy,
623 				     enum iser_data_dir cmd_dir);
624 
625 int  iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
626 			   enum iser_data_dir cmd_dir);
627 int  iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
628 			       enum iser_data_dir cmd_dir);
629 
630 int  iser_connect(struct iser_conn *iser_conn,
631 		  struct sockaddr *src_addr,
632 		  struct sockaddr *dst_addr,
633 		  int non_blocking);
634 
635 int  iser_reg_page_vec(struct ib_conn *ib_conn,
636 		       struct iser_page_vec *page_vec,
637 		       struct iser_mem_reg *mem_reg);
638 
639 void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
640 			enum iser_data_dir cmd_dir);
641 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
642 			    enum iser_data_dir cmd_dir);
643 
644 int  iser_post_recvl(struct iser_conn *iser_conn);
645 int  iser_post_recvm(struct iser_conn *iser_conn, int count);
646 int  iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
647 		    bool signal);
648 
649 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
650 			   struct iser_data_buf *data,
651 			   enum iser_data_dir iser_dir,
652 			   enum dma_data_direction dma_dir);
653 
654 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
655 			      struct iser_data_buf *data);
656 int  iser_initialize_task_headers(struct iscsi_task *task,
657 			struct iser_tx_desc *tx_desc);
658 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
659 			      struct iscsi_session *session);
660 int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max);
661 void iser_free_fmr_pool(struct ib_conn *ib_conn);
662 int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max);
663 void iser_free_fastreg_pool(struct ib_conn *ib_conn);
664 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
665 			     enum iser_data_dir cmd_dir, sector_t *sector);
666 #endif
667