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libcxgbi.h
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1 /*
2  * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
3  *
4  * Copyright (c) 2010 Chelsio Communications, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation.
9  *
10  * Written by: Karen Xie ([email protected])
11  * Written by: Rakesh Ranjan ([email protected])
12  */
13 
14 #ifndef __LIBCXGBI_H__
15 #define __LIBCXGBI_H__
16 
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/debugfs.h>
21 #include <linux/list.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_vlan.h>
24 #include <linux/scatterlist.h>
25 #include <linux/skbuff.h>
26 #include <linux/vmalloc.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/libiscsi_tcp.h>
29 
35 
39 };
40 
41 #define log_debug(level, fmt, ...) \
42  do { \
43  if (dbg_level & (level)) \
44  pr_info(fmt, ##__VA_ARGS__); \
45  } while (0)
46 
47 /* max. connections per adapter */
48 #define CXGBI_MAX_CONN 16384
49 
50 /* always allocate rooms for AHS */
51 #define SKB_TX_ISCSI_PDU_HEADER_MAX \
52  (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
53 
54 #define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8)*/
55 
56 /*
57  * align pdu size to multiple of 512 for better performance
58  */
59 #define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
60 
61 #define ULP2_MODE_ISCSI 2
62 
63 #define ULP2_MAX_PKT_SIZE 16224
64 #define ULP2_MAX_PDU_PAYLOAD \
65  (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
66 
67 /*
68  * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
69  * bytes are not sent by the host but are part of the TCP payload and therefore
70  * consume TCP sequence space.
71  */
72 static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
73 static inline unsigned int cxgbi_ulp_extra_len(int submode)
74 {
75  return ulp2_extra_len[submode & 3];
76 }
77 
78 /*
79  * struct pagepod_hdr, pagepod - pagepod format
80  */
81 
82 #define CPL_RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
83 #define CPL_RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
84 #define CPL_RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
85 #define CPL_RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
86 
93 };
94 
95 #define PPOD_PAGES_MAX 4
96 struct cxgbi_pagepod {
99 };
100 
102  unsigned char sw_bits;
103  unsigned char rsvd_bits;
104  unsigned char rsvd_shift;
105  unsigned char filler[1];
107 };
108 
110  unsigned int tag;
111  unsigned int length;
112  unsigned int offset;
113  unsigned int nelem;
114  struct page **pages;
116 };
117 
119  struct kref refcnt;
121  struct pci_dev *pdev;
122  unsigned int max_txsz;
123  unsigned int max_rxsz;
124  unsigned int llimit;
125  unsigned int ulimit;
126  unsigned int nppods;
127  unsigned int idx_last;
128  unsigned char idx_bits;
129  unsigned char filler[3];
130  unsigned int idx_mask;
131  unsigned int rsvd_tag_mask;
134 };
135 
136 #define DDP_PGIDX_MAX 4
137 #define DDP_THRESHOLD 2048
138 
139 #define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
140 
141 #define PPOD_SIZE sizeof(struct cxgbi_pagepod) /* 64 */
142 #define PPOD_SIZE_SHIFT 6
143 
144 #define ULPMEM_DSGL_MAX_NPPODS 16 /* 1024/PPOD_SIZE */
145 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
146 #define PCIE_MEMWIN_MAX_NPPODS 16 /* 1024/PPOD_SIZE */
147 
148 #define PPOD_COLOR_SHIFT 0
149 #define PPOD_COLOR(x) ((x) << PPOD_COLOR_SHIFT)
150 
151 #define PPOD_IDX_SHIFT 6
152 #define PPOD_IDX_MAX_SIZE 24
153 
154 #define PPOD_TID_SHIFT 0
155 #define PPOD_TID(x) ((x) << PPOD_TID_SHIFT)
156 
157 #define PPOD_TAG_SHIFT 6
158 #define PPOD_TAG(x) ((x) << PPOD_TAG_SHIFT)
159 
160 #define PPOD_VALID_SHIFT 24
161 #define PPOD_VALID(x) ((x) << PPOD_VALID_SHIFT)
162 #define PPOD_VALID_FLAG PPOD_VALID(1U)
163 
164 /*
165  * sge_opaque_hdr -
166  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
167  * and for which we must reserve space.
168  */
170  void *dev;
172 };
173 
174 struct cxgbi_sock {
176 
177  int tid;
178  int atid;
179  unsigned long flags;
180  unsigned int mtu;
181  unsigned short rss_qid;
182  unsigned short txq_idx;
183  unsigned short advmss;
184  unsigned int tx_chan;
185  unsigned int rx_chan;
186  unsigned int mss_idx;
187  unsigned int smac_idx;
188  unsigned char port_id;
190  int wr_cred;
192  unsigned char hcrc_len;
193  unsigned char dcrc_len;
194 
195  void *l2t;
203  struct kref refcnt;
204  unsigned int state;
207  struct dst_entry *dst;
211  int err;
213  void *user_data;
214 
221 };
222 
223 /*
224  * connection states
225  */
236 };
237 
238 /*
239  * Connection flags -- many to track some close related events.
240  */
242  CTPF_ABORT_RPL_RCVD, /*received one ABORT_RPL_RSS message */
243  CTPF_ABORT_REQ_RCVD, /*received one ABORT_REQ_RSS message */
244  CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
245  CTPF_TX_DATA_SENT, /* already sent a TX_DATA WR */
246  CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
247  CTPF_HAS_ATID, /* reserved atid */
248  CTPF_HAS_TID, /* reserved hw tid */
249  CTPF_OFFLOAD_DOWN, /* offload function off */
250 };
251 
255 };
256 
258  void *l2t;
259  struct sk_buff *wr_next;
260 };
261 
263  SKCBF_TX_NEED_HDR, /* packet needs a header */
264  SKCBF_RX_COALESCED, /* received whole pdu */
265  SKCBF_RX_HDR, /* received pdu header */
266  SKCBF_RX_DATA, /* received pdu payload */
267  SKCBF_RX_STATUS, /* received ddp status */
268  SKCBF_RX_DATA_DDPD, /* pdu payload ddp'd */
269  SKCBF_RX_HCRC_ERR, /* header digest error */
270  SKCBF_RX_DCRC_ERR, /* data digest error */
271  SKCBF_RX_PAD_ERR, /* padding byte error */
272 };
273 
274 struct cxgbi_skb_cb {
275  unsigned char ulp_mode;
276  unsigned long flags;
277  unsigned int seq;
278  union {
281  };
282 };
283 
284 #define CXGBI_SKB_CB(skb) ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
285 #define cxgbi_skcb_flags(skb) (CXGBI_SKB_CB(skb)->flags)
286 #define cxgbi_skcb_ulp_mode(skb) (CXGBI_SKB_CB(skb)->ulp_mode)
287 #define cxgbi_skcb_tcp_seq(skb) (CXGBI_SKB_CB(skb)->seq)
288 #define cxgbi_skcb_rx_ddigest(skb) (CXGBI_SKB_CB(skb)->rx.ddigest)
289 #define cxgbi_skcb_rx_pdulen(skb) (CXGBI_SKB_CB(skb)->rx.pdulen)
290 #define cxgbi_skcb_tx_wr_next(skb) (CXGBI_SKB_CB(skb)->tx.wr_next)
291 
292 static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
293  enum cxgbi_skcb_flags flag)
294 {
295  __set_bit(flag, &(cxgbi_skcb_flags(skb)));
296 }
297 
298 static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
299  enum cxgbi_skcb_flags flag)
300 {
301  __clear_bit(flag, &(cxgbi_skcb_flags(skb)));
302 }
303 
304 static inline int cxgbi_skcb_test_flag(struct sk_buff *skb,
305  enum cxgbi_skcb_flags flag)
306 {
307  return test_bit(flag, &(cxgbi_skcb_flags(skb)));
308 }
309 
310 static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
311  enum cxgbi_sock_flags flag)
312 {
313  __set_bit(flag, &csk->flags);
315  "csk 0x%p,%u,0x%lx, bit %d.\n",
316  csk, csk->state, csk->flags, flag);
317 }
318 
319 static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
320  enum cxgbi_sock_flags flag)
321 {
322  __clear_bit(flag, &csk->flags);
324  "csk 0x%p,%u,0x%lx, bit %d.\n",
325  csk, csk->state, csk->flags, flag);
326 }
327 
328 static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
329  enum cxgbi_sock_flags flag)
330 {
331  if (csk == NULL)
332  return 0;
333  return test_bit(flag, &csk->flags);
334 }
335 
336 static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
337 {
339  "csk 0x%p,%u,0x%lx, state -> %u.\n",
340  csk, csk->state, csk->flags, state);
341  csk->state = state;
342 }
343 
344 static inline void cxgbi_sock_free(struct kref *kref)
345 {
346  struct cxgbi_sock *csk = container_of(kref,
347  struct cxgbi_sock,
348  refcnt);
349  if (csk) {
351  "free csk 0x%p, state %u, flags 0x%lx\n",
352  csk, csk->state, csk->flags);
353  kfree(csk);
354  }
355 }
356 
357 static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
358 {
360  "%s, put csk 0x%p, ref %u-1.\n",
361  fn, csk, atomic_read(&csk->refcnt.refcount));
362  kref_put(&csk->refcnt, cxgbi_sock_free);
363 }
364 #define cxgbi_sock_put(csk) __cxgbi_sock_put(__func__, csk)
365 
366 static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
367 {
369  "%s, get csk 0x%p, ref %u+1.\n",
370  fn, csk, atomic_read(&csk->refcnt.refcount));
371  kref_get(&csk->refcnt);
372 }
373 #define cxgbi_sock_get(csk) __cxgbi_sock_get(__func__, csk)
374 
375 static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
376 {
377  return csk->state >= CTP_ACTIVE_CLOSE;
378 }
379 
380 static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
381 {
382  return csk->state == CTP_ESTABLISHED;
383 }
384 
385 static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
386 {
387  struct sk_buff *skb;
388 
389  while ((skb = __skb_dequeue(&csk->write_queue)))
390  __kfree_skb(skb);
391 }
392 
393 static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
394 {
395  unsigned int wscale = 0;
396 
397  while (wscale < 14 && (65535 << wscale) < win)
398  wscale++;
399  return wscale;
400 }
401 
402 static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
403 {
404  struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
405 
406  if (skb) {
407  __skb_put(skb, wrlen);
408  memset(skb->head, 0, wrlen + dlen);
409  } else
410  pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
411  return skb;
412 }
413 
414 
415 /*
416  * The number of WRs needed for an skb depends on the number of fragments
417  * in the skb and whether it has any payload in its main body. This maps the
418  * length of the gather list represented by an skb into the # of necessary WRs.
419  * The extra two fragments are for iscsi bhs and payload padding.
420  */
421 #define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2)
422 
423 static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
424 {
425  csk->wr_pending_head = csk->wr_pending_tail = NULL;
426 }
427 
428 static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
429  struct sk_buff *skb)
430 {
432  /*
433  * We want to take an extra reference since both us and the driver
434  * need to free the packet before it's really freed. We know there's
435  * just one user currently so we use atomic_set rather than skb_get
436  * to avoid the atomic op.
437  */
438  atomic_set(&skb->users, 2);
439 
440  if (!csk->wr_pending_head)
441  csk->wr_pending_head = skb;
442  else
444  csk->wr_pending_tail = skb;
445 }
446 
447 static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
448 {
449  int n = 0;
450  const struct sk_buff *skb = csk->wr_pending_head;
451 
452  while (skb) {
453  n += skb->csum;
454  skb = cxgbi_skcb_tx_wr_next(skb);
455  }
456  return n;
457 }
458 
459 static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
460 {
461  return csk->wr_pending_head;
462 }
463 
464 static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
465 {
466  struct sk_buff *skb = csk->wr_pending_head;
467 
468  if (likely(skb)) {
471  }
472  return skb;
473 }
474 
475 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
477 void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
478 void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
479 void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
480 void cxgbi_sock_closed(struct cxgbi_sock *);
481 void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
482 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
485 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
486  int);
487 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
488 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
489 
490 struct cxgbi_hba {
491  struct net_device *ndev;
492  struct net_device *vdev; /* vlan dev */
493  struct Scsi_Host *shost;
496  unsigned char port_id;
497 };
498 
500  unsigned int max_connect;
501  unsigned int used;
502  unsigned short sport_base;
504  unsigned int next;
506 };
507 
508 #define CXGBI_FLAG_DEV_T3 0x1
509 #define CXGBI_FLAG_DEV_T4 0x2
510 #define CXGBI_FLAG_ADAPTER_RESET 0x4
511 #define CXGBI_FLAG_IPV4_SET 0x10
512 struct cxgbi_device {
514  unsigned int flags;
515  struct net_device **ports;
516  void *lldev;
517  struct cxgbi_hba **hbas;
518  const unsigned short *mtus;
519  unsigned char nmtus;
520  unsigned char nports;
521  struct pci_dev *pdev;
524 
525  unsigned int pfvf;
526  unsigned int snd_win;
527  unsigned int rcv_win;
528  unsigned int rx_credit_thres;
529  unsigned int skb_tx_rsvd;
530  unsigned int skb_rx_extra; /* for msg coalesced mode */
531  unsigned int tx_max_size;
532  unsigned int rx_max_size;
536 
539  unsigned int, unsigned int,
540  struct cxgbi_gather_list *);
542  unsigned int, unsigned int, unsigned int);
544  unsigned int, int, int, int);
546  unsigned int, int, bool);
547 
549  int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
556 
557  void *dd_data;
558 };
559 #define cxgbi_cdev_priv(cdev) ((cdev)->dd_data)
560 
561 struct cxgbi_conn {
563  struct iscsi_conn *iconn;
564  struct cxgbi_hba *chba;
566 };
567 
569  struct cxgbi_conn *cconn;
570  struct cxgbi_hba *chba;
571  struct cxgbi_sock *csk;
572 };
573 
574 #define MAX_PDU_FRAGS ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
576  unsigned short nr_frags;
578  struct sk_buff *skb;
579  unsigned int offset;
580  unsigned int count;
581  unsigned int sgoffset;
582 };
583 #define iscsi_task_cxgbi_data(task) \
584  ((task)->dd_data + sizeof(struct iscsi_tcp_task))
585 
586 static inline int cxgbi_is_ddp_tag(struct cxgbi_tag_format *tformat, u32 tag)
587 {
588  return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
589 }
590 
591 static inline int cxgbi_sw_tag_usable(struct cxgbi_tag_format *tformat,
592  u32 sw_tag)
593 {
594  sw_tag >>= (32 - tformat->rsvd_bits);
595  return !sw_tag;
596 }
597 
598 static inline u32 cxgbi_set_non_ddp_tag(struct cxgbi_tag_format *tformat,
599  u32 sw_tag)
600 {
601  unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
602  u32 mask = (1 << shift) - 1;
603 
604  if (sw_tag && (sw_tag & ~mask)) {
605  u32 v1 = sw_tag & ((1 << shift) - 1);
606  u32 v2 = (sw_tag >> (shift - 1)) << shift;
607 
608  return v2 | v1 | 1 << shift;
609  }
610 
611  return sw_tag | 1 << shift;
612 }
613 
614 static inline u32 cxgbi_ddp_tag_base(struct cxgbi_tag_format *tformat,
615  u32 sw_tag)
616 {
617  u32 mask = (1 << tformat->rsvd_shift) - 1;
618 
619  if (sw_tag && (sw_tag & ~mask)) {
620  u32 v1 = sw_tag & mask;
621  u32 v2 = sw_tag >> tformat->rsvd_shift;
622 
623  v2 <<= tformat->rsvd_bits + tformat->rsvd_shift;
624 
625  return v2 | v1;
626  }
627 
628  return sw_tag;
629 }
630 
631 static inline u32 cxgbi_tag_rsvd_bits(struct cxgbi_tag_format *tformat,
632  u32 tag)
633 {
634  if (cxgbi_is_ddp_tag(tformat, tag))
635  return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
636 
637  return 0;
638 }
639 
640 static inline u32 cxgbi_tag_nonrsvd_bits(struct cxgbi_tag_format *tformat,
641  u32 tag)
642 {
643  unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
644  u32 v1, v2;
645 
646  if (cxgbi_is_ddp_tag(tformat, tag)) {
647  v1 = tag & ((1 << tformat->rsvd_shift) - 1);
648  v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
649  } else {
650  u32 mask = (1 << shift) - 1;
651  tag &= ~(1 << shift);
652  v1 = tag & mask;
653  v2 = (tag >> 1) & ~mask;
654  }
655  return v1 | v2;
656 }
657 
658 static inline void *cxgbi_alloc_big_mem(unsigned int size,
659  gfp_t gfp)
660 {
661  void *p = kmalloc(size, gfp);
662  if (!p)
663  p = vmalloc(size);
664  if (p)
665  memset(p, 0, size);
666  return p;
667 }
668 
669 static inline void cxgbi_free_big_mem(void *addr)
670 {
671  if (is_vmalloc_addr(addr))
672  vfree(addr);
673  else
674  kfree(addr);
675 }
676 
677 static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
678 {
679  if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
680  chba->ipv4addr = ipaddr;
681  else
682  pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
683  chba->ndev->name);
684 }
685 
686 static inline __be32 cxgbi_get_iscsi_ipv4(struct cxgbi_hba *chba)
687 {
688  return chba->ipv4addr;
689 }
690 
691 struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
693 void cxgbi_device_unregister_all(unsigned int flag);
695 int cxgbi_hbas_add(struct cxgbi_device *, unsigned int, unsigned int,
696  struct scsi_host_template *,
697  struct scsi_transport_template *);
698 void cxgbi_hbas_remove(struct cxgbi_device *);
699 
700 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
701  unsigned int max_conn);
703 
704 void cxgbi_conn_tx_open(struct cxgbi_sock *);
705 void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
706 int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
707 int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
708 int cxgbi_conn_xmit_pdu(struct iscsi_task *);
709 
710 void cxgbi_cleanup_task(struct iscsi_task *task);
711 
713 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
715  enum iscsi_param, char *, int);
716 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
719  struct iscsi_cls_conn *, u64, int);
722  u16, u16, u32);
723 int cxgbi_set_host_param(struct Scsi_Host *,
724  enum iscsi_host_param, char *, int);
725 int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
726 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
727  struct sockaddr *, int);
728 int cxgbi_ep_poll(struct iscsi_endpoint *, int);
729 void cxgbi_ep_disconnect(struct iscsi_endpoint *);
730 
731 int cxgbi_iscsi_init(struct iscsi_transport *,
732  struct scsi_transport_template **);
734  struct scsi_transport_template **);
735 void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
736 int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
737  unsigned int, unsigned int);
738 int cxgbi_ddp_cleanup(struct cxgbi_device *);
739 void cxgbi_ddp_page_size_factor(int *);
740 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *);
741 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *, struct cxgbi_pagepod_hdr *,
742  struct cxgbi_gather_list *, unsigned int);
743 #endif /*__LIBCXGBI_H__*/