summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cxgbi/libcxgbi.h
blob: dcb190e7534349b42f2a82568a601d14e8a152ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
/*
 * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
 *
 * Copyright (c) 2010-2015 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Karen Xie (kxie@chelsio.com)
 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
 */

#ifndef	__LIBCXGBI_H__
#define	__LIBCXGBI_H__

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <linux/version.h>
#include <scsi/scsi_device.h>
#include <scsi/libiscsi_tcp.h>

#include <libcxgb_ppm.h>

enum cxgbi_dbg_flag {
	CXGBI_DBG_ISCSI,
	CXGBI_DBG_DDP,
	CXGBI_DBG_TOE,
	CXGBI_DBG_SOCK,

	CXGBI_DBG_PDU_TX,
	CXGBI_DBG_PDU_RX,
	CXGBI_DBG_DEV,
};

#define log_debug(level, fmt, ...)	\
	do {	\
		if (dbg_level & (level)) \
			pr_info(fmt, ##__VA_ARGS__); \
	} while (0)

#define pr_info_ipaddr(fmt_trail,					\
			addr1, addr2, args_trail...)			\
do {									\
	if (!((1 << CXGBI_DBG_SOCK) & dbg_level))			\
		break;							\
	pr_info("%pISpc - %pISpc, " fmt_trail,				\
		addr1, addr2, args_trail);				\
} while (0)

/* max. connections per adapter */
#define CXGBI_MAX_CONN		16384

/* always allocate rooms for AHS */
#define SKB_TX_ISCSI_PDU_HEADER_MAX	\
	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)

#define	ISCSI_PDU_NONPAYLOAD_LEN	312 /* bhs(48) + ahs(256) + digest(8)*/

/*
 * align pdu size to multiple of 512 for better performance
 */
#define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)

#define ULP2_MODE_ISCSI		2

#define ULP2_MAX_PKT_SIZE	16224
#define ULP2_MAX_PDU_PAYLOAD	\
	(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)

/*
 * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
 * bytes are not sent by the host but are part of the TCP payload and therefore
 * consume TCP sequence space.
 */
static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
static inline unsigned int cxgbi_ulp_extra_len(int submode)
{
	return ulp2_extra_len[submode & 3];
}

#define CPL_RX_DDP_STATUS_DDP_SHIFT	16 /* ddp'able */
#define CPL_RX_DDP_STATUS_PAD_SHIFT	19 /* pad error */
#define CPL_RX_DDP_STATUS_HCRC_SHIFT	20 /* hcrc error */
#define CPL_RX_DDP_STATUS_DCRC_SHIFT	21 /* dcrc error */

/*
 * sge_opaque_hdr -
 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 * and for which we must reserve space.
 */
struct sge_opaque_hdr {
	void *dev;
	dma_addr_t addr[MAX_SKB_FRAGS + 1];
};

struct cxgbi_sock {
	struct cxgbi_device *cdev;

	int tid;
	int atid;
	unsigned long flags;
	unsigned int mtu;
	unsigned short rss_qid;
	unsigned short txq_idx;
	unsigned short advmss;
	unsigned int tx_chan;
	unsigned int rx_chan;
	unsigned int mss_idx;
	unsigned int smac_idx;
	unsigned char port_id;
	int wr_max_cred;
	int wr_cred;
	int wr_una_cred;
	unsigned char hcrc_len;
	unsigned char dcrc_len;

	void *l2t;
	struct sk_buff *wr_pending_head;
	struct sk_buff *wr_pending_tail;
	struct sk_buff *cpl_close;
	struct sk_buff *cpl_abort_req;
	struct sk_buff *cpl_abort_rpl;
	struct sk_buff *skb_ulp_lhdr;
	spinlock_t lock;
	struct kref refcnt;
	unsigned int state;
	unsigned int csk_family;
	union {
		struct sockaddr_in saddr;
		struct sockaddr_in6 saddr6;
	};
	union {
		struct sockaddr_in daddr;
		struct sockaddr_in6 daddr6;
	};
	struct dst_entry *dst;
	struct sk_buff_head receive_queue;
	struct sk_buff_head write_queue;
	struct timer_list retry_timer;
	int err;
	rwlock_t callback_lock;
	void *user_data;

	u32 rcv_nxt;
	u32 copied_seq;
	u32 rcv_wup;
	u32 snd_nxt;
	u32 snd_una;
	u32 write_seq;
	u32 snd_win;
	u32 rcv_win;
};

/*
 * connection states
 */
enum cxgbi_sock_states{
	CTP_CLOSED,
	CTP_CONNECTING,
	CTP_ACTIVE_OPEN,
	CTP_ESTABLISHED,
	CTP_ACTIVE_CLOSE,
	CTP_PASSIVE_CLOSE,
	CTP_CLOSE_WAIT_1,
	CTP_CLOSE_WAIT_2,
	CTP_ABORTING,
};

/*
 * Connection flags -- many to track some close related events.
 */
enum cxgbi_sock_flags {
	CTPF_ABORT_RPL_RCVD,	/*received one ABORT_RPL_RSS message */
	CTPF_ABORT_REQ_RCVD,	/*received one ABORT_REQ_RSS message */
	CTPF_ABORT_RPL_PENDING,	/* expecting an abort reply */
	CTPF_TX_DATA_SENT,	/* already sent a TX_DATA WR */
	CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
	CTPF_HAS_ATID,		/* reserved atid */
	CTPF_HAS_TID,		/* reserved hw tid */
	CTPF_OFFLOAD_DOWN,	/* offload function off */
	CTPF_LOGOUT_RSP_RCVD,   /* received logout response */
};

struct cxgbi_skb_rx_cb {
	__u32 ddigest;
	__u32 pdulen;
};

struct cxgbi_skb_tx_cb {
	void *handle;
	void *arp_err_handler;
	struct sk_buff *wr_next;
};

enum cxgbi_skcb_flags {
	SKCBF_TX_NEED_HDR,	/* packet needs a header */
	SKCBF_TX_MEM_WRITE,     /* memory write */
	SKCBF_TX_FLAG_COMPL,    /* wr completion flag */
	SKCBF_RX_COALESCED,	/* received whole pdu */
	SKCBF_RX_HDR,		/* received pdu header */
	SKCBF_RX_DATA,		/* received pdu payload */
	SKCBF_RX_STATUS,	/* received ddp status */
	SKCBF_RX_ISCSI_COMPL,   /* received iscsi completion */
	SKCBF_RX_DATA_DDPD,	/* pdu payload ddp'd */
	SKCBF_RX_HCRC_ERR,	/* header digest error */
	SKCBF_RX_DCRC_ERR,	/* data digest error */
	SKCBF_RX_PAD_ERR,	/* padding byte error */
};

struct cxgbi_skb_cb {
	union {
		struct cxgbi_skb_rx_cb rx;
		struct cxgbi_skb_tx_cb tx;
	};
	unsigned char ulp_mode;
	unsigned long flags;
	unsigned int seq;
};

#define CXGBI_SKB_CB(skb)	((struct cxgbi_skb_cb *)&((skb)->cb[0]))
#define cxgbi_skcb_flags(skb)		(CXGBI_SKB_CB(skb)->flags)
#define cxgbi_skcb_ulp_mode(skb)	(CXGBI_SKB_CB(skb)->ulp_mode)
#define cxgbi_skcb_tcp_seq(skb)		(CXGBI_SKB_CB(skb)->seq)
#define cxgbi_skcb_rx_ddigest(skb)	(CXGBI_SKB_CB(skb)->rx.ddigest)
#define cxgbi_skcb_rx_pdulen(skb)	(CXGBI_SKB_CB(skb)->rx.pdulen)
#define cxgbi_skcb_tx_wr_next(skb)	(CXGBI_SKB_CB(skb)->tx.wr_next)

static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
					enum cxgbi_skcb_flags flag)
{
	__set_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
					enum cxgbi_skcb_flags flag)
{
	__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
				       enum cxgbi_skcb_flags flag)
{
	return test_bit(flag, &(cxgbi_skcb_flags(skb)));
}

static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
					enum cxgbi_sock_flags flag)
{
	__set_bit(flag, &csk->flags);
	log_debug(1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, bit %d.\n",
		csk, csk->state, csk->flags, flag);
}

static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
					enum cxgbi_sock_flags flag)
{
	__clear_bit(flag, &csk->flags);
	log_debug(1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, bit %d.\n",
		csk, csk->state, csk->flags, flag);
}

static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
				enum cxgbi_sock_flags flag)
{
	if (csk == NULL)
		return 0;
	return test_bit(flag, &csk->flags);
}

static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
{
	log_debug(1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, state -> %u.\n",
		csk, csk->state, csk->flags, state);
	csk->state = state;
}

static inline void cxgbi_sock_free(struct kref *kref)
{
	struct cxgbi_sock *csk = container_of(kref,
						struct cxgbi_sock,
						refcnt);
	if (csk) {
		log_debug(1 << CXGBI_DBG_SOCK,
			"free csk 0x%p, state %u, flags 0x%lx\n",
			csk, csk->state, csk->flags);
		kfree(csk);
	}
}

static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
{
	log_debug(1 << CXGBI_DBG_SOCK,
		"%s, put csk 0x%p, ref %u-1.\n",
		fn, csk, kref_read(&csk->refcnt));
	kref_put(&csk->refcnt, cxgbi_sock_free);
}
#define cxgbi_sock_put(csk)	__cxgbi_sock_put(__func__, csk)

static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
{
	log_debug(1 << CXGBI_DBG_SOCK,
		"%s, get csk 0x%p, ref %u+1.\n",
		fn, csk, kref_read(&csk->refcnt));
	kref_get(&csk->refcnt);
}
#define cxgbi_sock_get(csk)	__cxgbi_sock_get(__func__, csk)

static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
{
	return csk->state >= CTP_ACTIVE_CLOSE;
}

static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
{
	return csk->state == CTP_ESTABLISHED;
}

static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
{
	struct sk_buff *skb;

	while ((skb = __skb_dequeue(&csk->write_queue)))
		__kfree_skb(skb);
}

static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
{
	unsigned int wscale = 0;

	while (wscale < 14 && (65535 << wscale) < win)
		wscale++;
	return wscale;
}

static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
{
	struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);

	if (skb) {
		__skb_put(skb, wrlen);
		memset(skb->head, 0, wrlen + dlen);
	} else
		pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
	return skb;
}


/*
 * The number of WRs needed for an skb depends on the number of fragments
 * in the skb and whether it has any payload in its main body.  This maps the
 * length of the gather list represented by an skb into the # of necessary WRs.
 * The extra two fragments are for iscsi bhs and payload padding.
 */
#define SKB_WR_LIST_SIZE	 (MAX_SKB_FRAGS + 2)

static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
{
	csk->wr_pending_head = csk->wr_pending_tail = NULL;
}

static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
					  struct sk_buff *skb)
{
	cxgbi_skcb_tx_wr_next(skb) = NULL;
	/*
	 * We want to take an extra reference since both us and the driver
	 * need to free the packet before it's really freed.
	 */
	skb_get(skb);

	if (!csk->wr_pending_head)
		csk->wr_pending_head = skb;
	else
		cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
	csk->wr_pending_tail = skb;
}

static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
{
	int n = 0;
	const struct sk_buff *skb = csk->wr_pending_head;

	while (skb) {
		n += skb->csum;
		skb = cxgbi_skcb_tx_wr_next(skb);
	}
	return n;
}

static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
{
	return csk->wr_pending_head;
}

static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
{
	struct sk_buff *skb = csk->wr_pending_head;

	if (likely(skb)) {
		csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
		cxgbi_skcb_tx_wr_next(skb) = NULL;
	}
	return skb;
}

void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
void cxgbi_sock_closed(struct cxgbi_sock *);
void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
				int);
unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);

struct cxgbi_hba {
	struct net_device *ndev;
	struct net_device *vdev;	/* vlan dev */
	struct Scsi_Host *shost;
	struct cxgbi_device *cdev;
	__be32 ipv4addr;
	unsigned char port_id;
};

struct cxgbi_ports_map {
	unsigned int max_connect;
	unsigned int used;
	unsigned short sport_base;
	spinlock_t lock;
	unsigned int next;
	struct cxgbi_sock **port_csk;
};

#define CXGBI_FLAG_DEV_T3		0x1
#define CXGBI_FLAG_DEV_T4		0x2
#define CXGBI_FLAG_ADAPTER_RESET	0x4
#define CXGBI_FLAG_IPV4_SET		0x10
#define CXGBI_FLAG_USE_PPOD_OFLDQ       0x40
#define CXGBI_FLAG_DDP_OFF		0x100

struct cxgbi_device {
	struct list_head list_head;
	struct list_head rcu_node;
	unsigned int flags;
	struct net_device **ports;
	void *lldev;
	struct cxgbi_hba **hbas;
	const unsigned short *mtus;
	unsigned char nmtus;
	unsigned char nports;
	struct pci_dev *pdev;
	struct dentry *debugfs_root;
	struct iscsi_transport *itp;
	struct module *owner;

	unsigned int pfvf;
	unsigned int rx_credit_thres;
	unsigned int skb_tx_rsvd;
	unsigned int skb_rx_extra;	/* for msg coalesced mode */
	unsigned int tx_max_size;
	unsigned int rx_max_size;
	unsigned int rxq_idx_cntr;
	struct cxgbi_ports_map pmap;

	void (*dev_ddp_cleanup)(struct cxgbi_device *);
	struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
	int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
			       struct cxgbi_task_tag_info *);
	void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
				  struct cxgbi_ppm *,
				  struct cxgbi_task_tag_info *);
	int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
				unsigned int, int, int, int);
	int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
				unsigned int, int, bool);

	void (*csk_release_offload_resources)(struct cxgbi_sock *);
	int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
	u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
	int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
	void (*csk_send_abort_req)(struct cxgbi_sock *);
	void (*csk_send_close_req)(struct cxgbi_sock *);
	int (*csk_alloc_cpls)(struct cxgbi_sock *);
	int (*csk_init_act_open)(struct cxgbi_sock *);

	void *dd_data;
};
#define cxgbi_cdev_priv(cdev)	((cdev)->dd_data)

struct cxgbi_conn {
	struct cxgbi_endpoint *cep;
	struct iscsi_conn *iconn;
	struct cxgbi_hba *chba;
	u32 task_idx_bits;
	unsigned int ddp_full;
	unsigned int ddp_tag_full;
};

struct cxgbi_endpoint {
	struct cxgbi_conn *cconn;
	struct cxgbi_hba *chba;
	struct cxgbi_sock *csk;
};

#define MAX_PDU_FRAGS	((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
struct cxgbi_task_data {
	unsigned short nr_frags;
	struct page_frag frags[MAX_PDU_FRAGS];
	struct sk_buff *skb;
	unsigned int dlen;
	unsigned int offset;
	unsigned int count;
	unsigned int sgoffset;
	struct cxgbi_task_tag_info ttinfo;
};
#define iscsi_task_cxgbi_data(task) \
	((task)->dd_data + sizeof(struct iscsi_tcp_task))

static inline void *cxgbi_alloc_big_mem(unsigned int size,
					gfp_t gfp)
{
	void *p = kzalloc(size, gfp | __GFP_NOWARN);

	if (!p)
		p = vzalloc(size);

	return p;
}

static inline void cxgbi_free_big_mem(void *addr)
{
	kvfree(addr);
}

static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
{
	if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
		chba->ipv4addr = ipaddr;
	else
		pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
			chba->ndev->name);
}

struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
void cxgbi_device_unregister(struct cxgbi_device *);
void cxgbi_device_unregister_all(unsigned int flag);
struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
						     int *);
int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
			struct scsi_host_template *,
			struct scsi_transport_template *);
void cxgbi_hbas_remove(struct cxgbi_device *);

int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
			unsigned int max_conn);
void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);

void cxgbi_conn_tx_open(struct cxgbi_sock *);
void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
int cxgbi_conn_xmit_pdu(struct iscsi_task *);

void cxgbi_cleanup_task(struct iscsi_task *task);

umode_t cxgbi_attr_is_visible(int param_type, int param);
void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
int cxgbi_set_conn_param(struct iscsi_cls_conn *,
			enum iscsi_param, char *, int);
int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
int cxgbi_bind_conn(struct iscsi_cls_session *,
			struct iscsi_cls_conn *, u64, int);
void cxgbi_destroy_session(struct iscsi_cls_session *);
struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
			u16, u16, u32);
int cxgbi_set_host_param(struct Scsi_Host *,
			enum iscsi_host_param, char *, int);
int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
			struct sockaddr *, int);
int cxgbi_ep_poll(struct iscsi_endpoint *, int);
void cxgbi_ep_disconnect(struct iscsi_endpoint *);

int cxgbi_iscsi_init(struct iscsi_transport *,
			struct scsi_transport_template **);
void cxgbi_iscsi_cleanup(struct iscsi_transport *,
			struct scsi_transport_template **);
void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
			unsigned int, unsigned int);
int cxgbi_ddp_cleanup(struct cxgbi_device *);
void cxgbi_ddp_page_size_factor(int *);
void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
			    struct cxgbi_task_tag_info *,
			    struct scatterlist **sg_pp, unsigned int *sg_off);
void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *,
			 struct cxgbi_tag_format *, unsigned int ppmax,
			 unsigned int llimit, unsigned int start,
			 unsigned int rsvd_factor);
#endif	/*__LIBCXGBI_H__*/