libcxgbi.h revision 0b3d8947972bfd2dd6d55c8009427ad2941ef038 
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 (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
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
30enum cxgbi_dbg_flag {
31	CXGBI_DBG_ISCSI,
32	CXGBI_DBG_DDP,
33	CXGBI_DBG_TOE,
34	CXGBI_DBG_SOCK,
35
36	CXGBI_DBG_PDU_TX,
37	CXGBI_DBG_PDU_RX,
38	CXGBI_DBG_DEV,
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 */
72static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
73static 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
87struct cxgbi_pagepod_hdr {
88	u32 vld_tid;
89	u32 pgsz_tag_clr;
90	u32 max_offset;
91	u32 page_offset;
92	u64 rsvd;
93};
94
95#define PPOD_PAGES_MAX			4
96struct cxgbi_pagepod {
97	struct cxgbi_pagepod_hdr hdr;
98	u64 addr[PPOD_PAGES_MAX + 1];
99};
100
101struct cxgbi_tag_format {
102	unsigned char sw_bits;
103	unsigned char rsvd_bits;
104	unsigned char rsvd_shift;
105	unsigned char filler[1];
106	u32 rsvd_mask;
107};
108
109struct cxgbi_gather_list {
110	unsigned int tag;
111	unsigned int length;
112	unsigned int offset;
113	unsigned int nelem;
114	struct page **pages;
115	dma_addr_t phys_addr[0];
116};
117
118struct cxgbi_ddp_info {
119	struct kref refcnt;
120	struct cxgbi_device *cdev;
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;
132	spinlock_t map_lock;
133	struct cxgbi_gather_list **gl_map;
134	struct sk_buff **gl_skb;
135};
136
137#define DDP_PGIDX_MAX		4
138#define DDP_THRESHOLD		2048
139
140#define PPOD_PAGES_SHIFT	2       /*  4 pages per pod */
141
142#define PPOD_SIZE               sizeof(struct cxgbi_pagepod)  /*  64 */
143#define PPOD_SIZE_SHIFT         6
144
145#define ULPMEM_DSGL_MAX_NPPODS	16	/*  1024/PPOD_SIZE */
146#define ULPMEM_IDATA_MAX_NPPODS	4	/*  256/PPOD_SIZE */
147#define PCIE_MEMWIN_MAX_NPPODS	16	/*  1024/PPOD_SIZE */
148
149#define PPOD_COLOR_SHIFT	0
150#define PPOD_COLOR(x)		((x) << PPOD_COLOR_SHIFT)
151
152#define PPOD_IDX_SHIFT          6
153#define PPOD_IDX_MAX_SIZE       24
154
155#define PPOD_TID_SHIFT		0
156#define PPOD_TID(x)		((x) << PPOD_TID_SHIFT)
157
158#define PPOD_TAG_SHIFT		6
159#define PPOD_TAG(x)		((x) << PPOD_TAG_SHIFT)
160
161#define PPOD_VALID_SHIFT	24
162#define PPOD_VALID(x)		((x) << PPOD_VALID_SHIFT)
163#define PPOD_VALID_FLAG		PPOD_VALID(1U)
164
165#define W_TCB_ULP_TYPE          0
166#define TCB_ULP_TYPE_SHIFT      0
167#define TCB_ULP_TYPE_MASK       0xfULL
168#define TCB_ULP_TYPE(x)         ((x) << TCB_ULP_TYPE_SHIFT)
169
170#define W_TCB_ULP_RAW           0
171#define TCB_ULP_RAW_SHIFT       4
172#define TCB_ULP_RAW_MASK        0xffULL
173#define TCB_ULP_RAW(x)          ((x) << TCB_ULP_RAW_SHIFT)
174
175/*
176 * sge_opaque_hdr -
177 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
178 * and for which we must reserve space.
179 */
180struct sge_opaque_hdr {
181	void *dev;
182	dma_addr_t addr[MAX_SKB_FRAGS + 1];
183};
184
185struct cxgbi_sock {
186	struct cxgbi_device *cdev;
187
188	int tid;
189	int atid;
190	unsigned long flags;
191	unsigned int mtu;
192	unsigned short rss_qid;
193	unsigned short txq_idx;
194	unsigned short advmss;
195	unsigned int tx_chan;
196	unsigned int rx_chan;
197	unsigned int mss_idx;
198	unsigned int smac_idx;
199	unsigned char port_id;
200	int wr_max_cred;
201	int wr_cred;
202	int wr_una_cred;
203	unsigned char hcrc_len;
204	unsigned char dcrc_len;
205
206	void *l2t;
207	struct sk_buff *wr_pending_head;
208	struct sk_buff *wr_pending_tail;
209	struct sk_buff *cpl_close;
210	struct sk_buff *cpl_abort_req;
211	struct sk_buff *cpl_abort_rpl;
212	struct sk_buff *skb_ulp_lhdr;
213	spinlock_t lock;
214	struct kref refcnt;
215	unsigned int state;
216	struct sockaddr_in saddr;
217	struct sockaddr_in daddr;
218	struct dst_entry *dst;
219	struct sk_buff_head receive_queue;
220	struct sk_buff_head write_queue;
221	struct timer_list retry_timer;
222	int err;
223	rwlock_t callback_lock;
224	void *user_data;
225
226	u32 rcv_nxt;
227	u32 copied_seq;
228	u32 rcv_wup;
229	u32 snd_nxt;
230	u32 snd_una;
231	u32 write_seq;
232};
233
234/*
235 * connection states
236 */
237enum cxgbi_sock_states{
238	CTP_CLOSED,
239	CTP_CONNECTING,
240	CTP_ACTIVE_OPEN,
241	CTP_ESTABLISHED,
242	CTP_ACTIVE_CLOSE,
243	CTP_PASSIVE_CLOSE,
244	CTP_CLOSE_WAIT_1,
245	CTP_CLOSE_WAIT_2,
246	CTP_ABORTING,
247};
248
249/*
250 * Connection flags -- many to track some close related events.
251 */
252enum cxgbi_sock_flags {
253	CTPF_ABORT_RPL_RCVD,	/*received one ABORT_RPL_RSS message */
254	CTPF_ABORT_REQ_RCVD,	/*received one ABORT_REQ_RSS message */
255	CTPF_ABORT_RPL_PENDING,	/* expecting an abort reply */
256	CTPF_TX_DATA_SENT,	/* already sent a TX_DATA WR */
257	CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
258	CTPF_HAS_ATID,		/* reserved atid */
259	CTPF_HAS_TID,		/* reserved hw tid */
260	CTPF_OFFLOAD_DOWN,	/* offload function off */
261};
262
263struct cxgbi_skb_rx_cb {
264	__u32 ddigest;
265	__u32 pdulen;
266};
267
268struct cxgbi_skb_tx_cb {
269	void *l2t;
270	struct sk_buff *wr_next;
271};
272
273enum cxgbi_skcb_flags {
274	SKCBF_TX_NEED_HDR,	/* packet needs a header */
275	SKCBF_RX_COALESCED,	/* received whole pdu */
276	SKCBF_RX_HDR,		/* recieved pdu header */
277	SKCBF_RX_DATA,		/* recieved pdu payload */
278	SKCBF_RX_STATUS,	/* recieved ddp status */
279	SKCBF_RX_DATA_DDPD,	/* pdu payload ddp'd */
280	SKCBF_RX_HCRC_ERR,	/* header digest error */
281	SKCBF_RX_DCRC_ERR,	/* data digest error */
282	SKCBF_RX_PAD_ERR,	/* padding byte error */
283};
284
285struct cxgbi_skb_cb {
286	unsigned char ulp_mode;
287	unsigned long flags;
288	unsigned int seq;
289	union {
290		struct cxgbi_skb_rx_cb rx;
291		struct cxgbi_skb_tx_cb tx;
292	};
293};
294
295#define CXGBI_SKB_CB(skb)	((struct cxgbi_skb_cb *)&((skb)->cb[0]))
296#define cxgbi_skcb_flags(skb)		(CXGBI_SKB_CB(skb)->flags)
297#define cxgbi_skcb_ulp_mode(skb)	(CXGBI_SKB_CB(skb)->ulp_mode)
298#define cxgbi_skcb_tcp_seq(skb)		(CXGBI_SKB_CB(skb)->seq)
299#define cxgbi_skcb_rx_ddigest(skb)	(CXGBI_SKB_CB(skb)->rx.ddigest)
300#define cxgbi_skcb_rx_pdulen(skb)	(CXGBI_SKB_CB(skb)->rx.pdulen)
301#define cxgbi_skcb_tx_wr_next(skb)	(CXGBI_SKB_CB(skb)->tx.wr_next)
302
303static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
304					enum cxgbi_skcb_flags flag)
305{
306	__set_bit(flag, &(cxgbi_skcb_flags(skb)));
307}
308
309static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
310					enum cxgbi_skcb_flags flag)
311{
312	__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
313}
314
315static inline int cxgbi_skcb_test_flag(struct sk_buff *skb,
316					enum cxgbi_skcb_flags flag)
317{
318	return test_bit(flag, &(cxgbi_skcb_flags(skb)));
319}
320
321static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
322					enum cxgbi_sock_flags flag)
323{
324	__set_bit(flag, &csk->flags);
325	log_debug(1 << CXGBI_DBG_SOCK,
326		"csk 0x%p,%u,0x%lx, bit %d.\n",
327		csk, csk->state, csk->flags, flag);
328}
329
330static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
331					enum cxgbi_sock_flags flag)
332{
333	__clear_bit(flag, &csk->flags);
334	log_debug(1 << CXGBI_DBG_SOCK,
335		"csk 0x%p,%u,0x%lx, bit %d.\n",
336		csk, csk->state, csk->flags, flag);
337}
338
339static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
340				enum cxgbi_sock_flags flag)
341{
342	if (csk == NULL)
343		return 0;
344	return test_bit(flag, &csk->flags);
345}
346
347static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
348{
349	log_debug(1 << CXGBI_DBG_SOCK,
350		"csk 0x%p,%u,0x%lx, state -> %u.\n",
351		csk, csk->state, csk->flags, state);
352	csk->state = state;
353}
354
355static inline void cxgbi_sock_free(struct kref *kref)
356{
357	struct cxgbi_sock *csk = container_of(kref,
358						struct cxgbi_sock,
359						refcnt);
360	if (csk) {
361		log_debug(1 << CXGBI_DBG_SOCK,
362			"free csk 0x%p, state %u, flags 0x%lx\n",
363			csk, csk->state, csk->flags);
364		kfree(csk);
365	}
366}
367
368static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
369{
370	log_debug(1 << CXGBI_DBG_SOCK,
371		"%s, put csk 0x%p, ref %u-1.\n",
372		fn, csk, atomic_read(&csk->refcnt.refcount));
373	kref_put(&csk->refcnt, cxgbi_sock_free);
374}
375#define cxgbi_sock_put(csk)	__cxgbi_sock_put(__func__, csk)
376
377static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
378{
379	log_debug(1 << CXGBI_DBG_SOCK,
380		"%s, get csk 0x%p, ref %u+1.\n",
381		fn, csk, atomic_read(&csk->refcnt.refcount));
382	kref_get(&csk->refcnt);
383}
384#define cxgbi_sock_get(csk)	__cxgbi_sock_get(__func__, csk)
385
386static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
387{
388	return csk->state >= CTP_ACTIVE_CLOSE;
389}
390
391static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
392{
393	return csk->state == CTP_ESTABLISHED;
394}
395
396static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
397{
398	struct sk_buff *skb;
399
400	while ((skb = __skb_dequeue(&csk->write_queue)))
401		__kfree_skb(skb);
402}
403
404static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
405{
406	unsigned int wscale = 0;
407
408	while (wscale < 14 && (65535 << wscale) < win)
409		wscale++;
410	return wscale;
411}
412
413static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
414{
415	struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
416
417	if (skb) {
418		__skb_put(skb, wrlen);
419		memset(skb->head, 0, wrlen + dlen);
420	} else
421		pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
422	return skb;
423}
424
425
426/*
427 * The number of WRs needed for an skb depends on the number of fragments
428 * in the skb and whether it has any payload in its main body.  This maps the
429 * length of the gather list represented by an skb into the # of necessary WRs.
430 * The extra two fragments are for iscsi bhs and payload padding.
431 */
432#define SKB_WR_LIST_SIZE	 (MAX_SKB_FRAGS + 2)
433
434static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
435{
436	csk->wr_pending_head = csk->wr_pending_tail = NULL;
437}
438
439static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
440					  struct sk_buff *skb)
441{
442	cxgbi_skcb_tx_wr_next(skb) = NULL;
443	/*
444	 * We want to take an extra reference since both us and the driver
445	 * need to free the packet before it's really freed. We know there's
446	 * just one user currently so we use atomic_set rather than skb_get
447	 * to avoid the atomic op.
448	 */
449	atomic_set(&skb->users, 2);
450
451	if (!csk->wr_pending_head)
452		csk->wr_pending_head = skb;
453	else
454		cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
455	csk->wr_pending_tail = skb;
456}
457
458static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
459{
460	int n = 0;
461	const struct sk_buff *skb = csk->wr_pending_head;
462
463	while (skb) {
464		n += skb->csum;
465		skb = cxgbi_skcb_tx_wr_next(skb);
466	}
467	return n;
468}
469
470static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
471{
472	return csk->wr_pending_head;
473}
474
475static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
476{
477	struct sk_buff *skb = csk->wr_pending_head;
478
479	if (likely(skb)) {
480		csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
481		cxgbi_skcb_tx_wr_next(skb) = NULL;
482	}
483	return skb;
484}
485
486void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
487void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
488void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
489void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
490void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
491void cxgbi_sock_closed(struct cxgbi_sock *);
492void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
493void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
494void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
495void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
496void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
497				int);
498unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
499void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
500
501struct cxgbi_hba {
502	struct net_device *ndev;
503	struct net_device *vdev;	/* vlan dev */
504	struct Scsi_Host *shost;
505	struct cxgbi_device *cdev;
506	__be32 ipv4addr;
507	unsigned char port_id;
508};
509
510struct cxgbi_ports_map {
511	unsigned int max_connect;
512	unsigned int used;
513	unsigned short sport_base;
514	spinlock_t lock;
515	unsigned int next;
516	struct cxgbi_sock **port_csk;
517};
518
519#define CXGBI_FLAG_DEV_T3		0x1
520#define CXGBI_FLAG_DEV_T4		0x2
521#define CXGBI_FLAG_ADAPTER_RESET	0x4
522#define CXGBI_FLAG_IPV4_SET		0x10
523struct cxgbi_device {
524	struct list_head list_head;
525	unsigned int flags;
526	struct net_device **ports;
527	void *lldev;
528	struct cxgbi_hba **hbas;
529	const unsigned short *mtus;
530	unsigned char nmtus;
531	unsigned char nports;
532	struct pci_dev *pdev;
533	struct dentry *debugfs_root;
534	struct iscsi_transport *itp;
535
536	unsigned int pfvf;
537	unsigned int snd_win;
538	unsigned int rcv_win;
539	unsigned int rx_credit_thres;
540	unsigned int skb_tx_rsvd;
541	unsigned int skb_rx_extra;	/* for msg coalesced mode */
542	unsigned int tx_max_size;
543	unsigned int rx_max_size;
544	struct cxgbi_ports_map pmap;
545	struct cxgbi_tag_format tag_format;
546	struct cxgbi_ddp_info *ddp;
547
548	void (*dev_ddp_cleanup)(struct cxgbi_device *);
549	void (*csk_ddp_free_gl_skb)(struct cxgbi_ddp_info *, int, int);
550	int (*csk_ddp_alloc_gl_skb)(struct cxgbi_ddp_info *, int, int, gfp_t);
551	int (*csk_ddp_set)(struct cxgbi_sock *, struct cxgbi_pagepod_hdr *,
552				unsigned int, unsigned int,
553				struct cxgbi_gather_list *);
554	void (*csk_ddp_clear)(struct cxgbi_hba *,
555				unsigned int, unsigned int, unsigned int);
556	int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
557				unsigned int, int, int, int);
558	int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
559				unsigned int, int, bool);
560
561	void (*csk_release_offload_resources)(struct cxgbi_sock *);
562	int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
563	u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
564	int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
565	void (*csk_send_abort_req)(struct cxgbi_sock *);
566	void (*csk_send_close_req)(struct cxgbi_sock *);
567	int (*csk_alloc_cpls)(struct cxgbi_sock *);
568	int (*csk_init_act_open)(struct cxgbi_sock *);
569
570	void *dd_data;
571};
572#define cxgbi_cdev_priv(cdev)	((cdev)->dd_data)
573
574struct cxgbi_conn {
575	struct cxgbi_endpoint *cep;
576	struct iscsi_conn *iconn;
577	struct cxgbi_hba *chba;
578	u32 task_idx_bits;
579};
580
581struct cxgbi_endpoint {
582	struct cxgbi_conn *cconn;
583	struct cxgbi_hba *chba;
584	struct cxgbi_sock *csk;
585};
586
587#define MAX_PDU_FRAGS	((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
588struct cxgbi_task_data {
589	unsigned short nr_frags;
590	skb_frag_t frags[MAX_PDU_FRAGS];
591	struct sk_buff *skb;
592	unsigned int offset;
593	unsigned int count;
594	unsigned int sgoffset;
595};
596#define iscsi_task_cxgbi_data(task) \
597	((task)->dd_data + sizeof(struct iscsi_tcp_task))
598
599static inline int cxgbi_is_ddp_tag(struct cxgbi_tag_format *tformat, u32 tag)
600{
601	return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
602}
603
604static inline int cxgbi_sw_tag_usable(struct cxgbi_tag_format *tformat,
605					u32 sw_tag)
606{
607	sw_tag >>= (32 - tformat->rsvd_bits);
608	return !sw_tag;
609}
610
611static inline u32 cxgbi_set_non_ddp_tag(struct cxgbi_tag_format *tformat,
612					u32 sw_tag)
613{
614	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
615	u32 mask = (1 << shift) - 1;
616
617	if (sw_tag && (sw_tag & ~mask)) {
618		u32 v1 = sw_tag & ((1 << shift) - 1);
619		u32 v2 = (sw_tag >> (shift - 1)) << shift;
620
621		return v2 | v1 | 1 << shift;
622	}
623
624	return sw_tag | 1 << shift;
625}
626
627static inline u32 cxgbi_ddp_tag_base(struct cxgbi_tag_format *tformat,
628					u32 sw_tag)
629{
630	u32 mask = (1 << tformat->rsvd_shift) - 1;
631
632	if (sw_tag && (sw_tag & ~mask)) {
633		u32 v1 = sw_tag & mask;
634		u32 v2 = sw_tag >> tformat->rsvd_shift;
635
636		v2 <<= tformat->rsvd_bits + tformat->rsvd_shift;
637
638		return v2 | v1;
639	}
640
641	return sw_tag;
642}
643
644static inline u32 cxgbi_tag_rsvd_bits(struct cxgbi_tag_format *tformat,
645					u32 tag)
646{
647	if (cxgbi_is_ddp_tag(tformat, tag))
648		return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
649
650	return 0;
651}
652
653static inline u32 cxgbi_tag_nonrsvd_bits(struct cxgbi_tag_format *tformat,
654					u32 tag)
655{
656	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
657	u32 v1, v2;
658
659	if (cxgbi_is_ddp_tag(tformat, tag)) {
660		v1 = tag & ((1 << tformat->rsvd_shift) - 1);
661		v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
662	} else {
663		u32 mask = (1 << shift) - 1;
664		tag &= ~(1 << shift);
665		v1 = tag & mask;
666		v2 = (tag >> 1) & ~mask;
667	}
668	return v1 | v2;
669}
670
671static inline void *cxgbi_alloc_big_mem(unsigned int size,
672					gfp_t gfp)
673{
674	void *p = kmalloc(size, gfp);
675	if (!p)
676		p = vmalloc(size);
677	if (p)
678		memset(p, 0, size);
679	return p;
680}
681
682static inline void cxgbi_free_big_mem(void *addr)
683{
684	if (is_vmalloc_addr(addr))
685		vfree(addr);
686	else
687		kfree(addr);
688}
689
690static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
691{
692	if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
693		chba->ipv4addr = ipaddr;
694	else
695		pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
696			chba->ndev->name);
697}
698
699static inline __be32 cxgbi_get_iscsi_ipv4(struct cxgbi_hba *chba)
700{
701	return chba->ipv4addr;
702}
703
704struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
705void cxgbi_device_unregister(struct cxgbi_device *);
706void cxgbi_device_unregister_all(unsigned int flag);
707struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
708int cxgbi_hbas_add(struct cxgbi_device *, unsigned int, unsigned int,
709			struct scsi_host_template *,
710			struct scsi_transport_template *);
711void cxgbi_hbas_remove(struct cxgbi_device *);
712
713int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
714			unsigned int max_conn);
715void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
716
717void cxgbi_conn_tx_open(struct cxgbi_sock *);
718void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
719int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
720int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
721int cxgbi_conn_xmit_pdu(struct iscsi_task *);
722
723void cxgbi_cleanup_task(struct iscsi_task *task);
724
725void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
726int cxgbi_set_conn_param(struct iscsi_cls_conn *,
727			enum iscsi_param, char *, int);
728int cxgbi_get_conn_param(struct iscsi_cls_conn *, enum iscsi_param, char *);
729struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
730int cxgbi_bind_conn(struct iscsi_cls_session *,
731			struct iscsi_cls_conn *, u64, int);
732void cxgbi_destroy_session(struct iscsi_cls_session *);
733struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
734			u16, u16, u32);
735int cxgbi_set_host_param(struct Scsi_Host *,
736			enum iscsi_host_param, char *, int);
737int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
738struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
739			struct sockaddr *, int);
740int cxgbi_ep_poll(struct iscsi_endpoint *, int);
741void cxgbi_ep_disconnect(struct iscsi_endpoint *);
742
743int cxgbi_iscsi_init(struct iscsi_transport *,
744			struct scsi_transport_template **);
745void cxgbi_iscsi_cleanup(struct iscsi_transport *,
746			struct scsi_transport_template **);
747void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
748int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
749			unsigned int, unsigned int);
750int cxgbi_ddp_cleanup(struct cxgbi_device *);
751void cxgbi_ddp_page_size_factor(int *);
752void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *);
753void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *, struct cxgbi_pagepod_hdr *,
754			struct cxgbi_gather_list *, unsigned int);
755#endif	/*__LIBCXGBI_H__*/
756