xref: /openbmc/linux/drivers/scsi/cxgbi/libcxgbi.h (revision 80602aca)
1 /*
2  * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
3  *
4  * Copyright (c) 2010-2015 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 
30 #include <libcxgb_ppm.h>
31 
32 enum cxgbi_dbg_flag {
33 	CXGBI_DBG_ISCSI,
34 	CXGBI_DBG_DDP,
35 	CXGBI_DBG_TOE,
36 	CXGBI_DBG_SOCK,
37 
38 	CXGBI_DBG_PDU_TX,
39 	CXGBI_DBG_PDU_RX,
40 	CXGBI_DBG_DEV,
41 };
42 
43 #define log_debug(level, fmt, ...)	\
44 	do {	\
45 		if (dbg_level & (level)) \
46 			pr_info(fmt, ##__VA_ARGS__); \
47 	} while (0)
48 
49 #define pr_info_ipaddr(fmt_trail,					\
50 			addr1, addr2, args_trail...)			\
51 do {									\
52 	if (!((1 << CXGBI_DBG_SOCK) & dbg_level))			\
53 		break;							\
54 	pr_info("%pISpc - %pISpc, " fmt_trail,				\
55 		addr1, addr2, args_trail);				\
56 } while (0)
57 
58 /* max. connections per adapter */
59 #define CXGBI_MAX_CONN		16384
60 
61 /* always allocate rooms for AHS */
62 #define SKB_TX_ISCSI_PDU_HEADER_MAX	\
63 	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
64 
65 #define	ISCSI_PDU_NONPAYLOAD_LEN	312 /* bhs(48) + ahs(256) + digest(8)*/
66 
67 /*
68  * align pdu size to multiple of 512 for better performance
69  */
70 #define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
71 
72 #define ULP2_MODE_ISCSI		2
73 
74 #define ULP2_MAX_PKT_SIZE	16224
75 #define ULP2_MAX_PDU_PAYLOAD	\
76 	(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
77 
78 #define CXGBI_ULP2_MAX_ISO_PAYLOAD	65535
79 
80 #define CXGBI_MAX_ISO_DATA_IN_SKB	\
81 	min_t(u32, MAX_SKB_FRAGS << PAGE_SHIFT, CXGBI_ULP2_MAX_ISO_PAYLOAD)
82 
83 #define cxgbi_is_iso_config(csk)	((csk)->cdev->skb_iso_txhdr)
84 #define cxgbi_is_iso_disabled(csk)	((csk)->disable_iso)
85 
86 /*
87  * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
88  * bytes are not sent by the host but are part of the TCP payload and therefore
89  * consume TCP sequence space.
90  */
91 static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
cxgbi_ulp_extra_len(int submode)92 static inline unsigned int cxgbi_ulp_extra_len(int submode)
93 {
94 	return ulp2_extra_len[submode & 3];
95 }
96 
97 #define CPL_RX_DDP_STATUS_DDP_SHIFT	16 /* ddp'able */
98 #define CPL_RX_DDP_STATUS_PAD_SHIFT	19 /* pad error */
99 #define CPL_RX_DDP_STATUS_HCRC_SHIFT	20 /* hcrc error */
100 #define CPL_RX_DDP_STATUS_DCRC_SHIFT	21 /* dcrc error */
101 
102 /*
103  * sge_opaque_hdr -
104  * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
105  * and for which we must reserve space.
106  */
107 struct sge_opaque_hdr {
108 	void *dev;
109 	dma_addr_t addr[MAX_SKB_FRAGS + 1];
110 };
111 
112 struct cxgbi_sock {
113 	struct cxgbi_device *cdev;
114 
115 	int tid;
116 	int atid;
117 	unsigned long flags;
118 	unsigned int mtu;
119 	unsigned short rss_qid;
120 	unsigned short txq_idx;
121 	unsigned short advmss;
122 	unsigned int tx_chan;
123 	unsigned int rx_chan;
124 	unsigned int mss_idx;
125 	unsigned int smac_idx;
126 	unsigned char port_id;
127 	int wr_max_cred;
128 	int wr_cred;
129 	int wr_una_cred;
130 #ifdef CONFIG_CHELSIO_T4_DCB
131 	u8 dcb_priority;
132 #endif
133 	unsigned char hcrc_len;
134 	unsigned char dcrc_len;
135 
136 	void *l2t;
137 	struct sk_buff *wr_pending_head;
138 	struct sk_buff *wr_pending_tail;
139 	struct sk_buff *cpl_close;
140 	struct sk_buff *cpl_abort_req;
141 	struct sk_buff *cpl_abort_rpl;
142 	struct sk_buff *skb_ulp_lhdr;
143 	spinlock_t lock;
144 	struct kref refcnt;
145 	unsigned int state;
146 	unsigned int csk_family;
147 	union {
148 		struct sockaddr_in saddr;
149 		struct sockaddr_in6 saddr6;
150 	};
151 	union {
152 		struct sockaddr_in daddr;
153 		struct sockaddr_in6 daddr6;
154 	};
155 	struct dst_entry *dst;
156 	struct sk_buff_head receive_queue;
157 	struct sk_buff_head write_queue;
158 	struct timer_list retry_timer;
159 	struct completion cmpl;
160 	int err;
161 	rwlock_t callback_lock;
162 	void *user_data;
163 
164 	u32 rcv_nxt;
165 	u32 copied_seq;
166 	u32 rcv_wup;
167 	u32 snd_nxt;
168 	u32 snd_una;
169 	u32 write_seq;
170 	u32 snd_win;
171 	u32 rcv_win;
172 
173 	bool disable_iso;
174 	u32 no_tx_credits;
175 	unsigned long prev_iso_ts;
176 };
177 
178 /*
179  * connection states
180  */
181 enum cxgbi_sock_states{
182 	CTP_CLOSED,
183 	CTP_CONNECTING,
184 	CTP_ACTIVE_OPEN,
185 	CTP_ESTABLISHED,
186 	CTP_ACTIVE_CLOSE,
187 	CTP_PASSIVE_CLOSE,
188 	CTP_CLOSE_WAIT_1,
189 	CTP_CLOSE_WAIT_2,
190 	CTP_ABORTING,
191 };
192 
193 /*
194  * Connection flags -- many to track some close related events.
195  */
196 enum cxgbi_sock_flags {
197 	CTPF_ABORT_RPL_RCVD,	/*received one ABORT_RPL_RSS message */
198 	CTPF_ABORT_REQ_RCVD,	/*received one ABORT_REQ_RSS message */
199 	CTPF_ABORT_RPL_PENDING,	/* expecting an abort reply */
200 	CTPF_TX_DATA_SENT,	/* already sent a TX_DATA WR */
201 	CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
202 	CTPF_HAS_ATID,		/* reserved atid */
203 	CTPF_HAS_TID,		/* reserved hw tid */
204 	CTPF_OFFLOAD_DOWN,	/* offload function off */
205 	CTPF_LOGOUT_RSP_RCVD,   /* received logout response */
206 };
207 
208 struct cxgbi_skb_rx_cb {
209 	__u32 ddigest;
210 	__u32 pdulen;
211 };
212 
213 struct cxgbi_skb_tx_cb {
214 	void *handle;
215 	void *arp_err_handler;
216 	struct sk_buff *wr_next;
217 	u16 iscsi_hdr_len;
218 	u8 ulp_mode;
219 };
220 
221 enum cxgbi_skcb_flags {
222 	SKCBF_TX_NEED_HDR,	/* packet needs a header */
223 	SKCBF_TX_MEM_WRITE,     /* memory write */
224 	SKCBF_TX_FLAG_COMPL,    /* wr completion flag */
225 	SKCBF_RX_COALESCED,	/* received whole pdu */
226 	SKCBF_RX_HDR,		/* received pdu header */
227 	SKCBF_RX_DATA,		/* received pdu payload */
228 	SKCBF_RX_STATUS,	/* received ddp status */
229 	SKCBF_RX_ISCSI_COMPL,   /* received iscsi completion */
230 	SKCBF_RX_DATA_DDPD,	/* pdu payload ddp'd */
231 	SKCBF_RX_HCRC_ERR,	/* header digest error */
232 	SKCBF_RX_DCRC_ERR,	/* data digest error */
233 	SKCBF_RX_PAD_ERR,	/* padding byte error */
234 	SKCBF_TX_ISO,		/* iso cpl in tx skb */
235 };
236 
237 struct cxgbi_skb_cb {
238 	union {
239 		struct cxgbi_skb_rx_cb rx;
240 		struct cxgbi_skb_tx_cb tx;
241 	};
242 	unsigned long flags;
243 	unsigned int seq;
244 };
245 
246 #define CXGBI_SKB_CB(skb)	((struct cxgbi_skb_cb *)&((skb)->cb[0]))
247 #define cxgbi_skcb_flags(skb)		(CXGBI_SKB_CB(skb)->flags)
248 #define cxgbi_skcb_tcp_seq(skb)		(CXGBI_SKB_CB(skb)->seq)
249 #define cxgbi_skcb_rx_ddigest(skb)	(CXGBI_SKB_CB(skb)->rx.ddigest)
250 #define cxgbi_skcb_rx_pdulen(skb)	(CXGBI_SKB_CB(skb)->rx.pdulen)
251 #define cxgbi_skcb_tx_wr_next(skb)	(CXGBI_SKB_CB(skb)->tx.wr_next)
252 #define cxgbi_skcb_tx_iscsi_hdrlen(skb)	(CXGBI_SKB_CB(skb)->tx.iscsi_hdr_len)
253 #define cxgbi_skcb_tx_ulp_mode(skb)	(CXGBI_SKB_CB(skb)->tx.ulp_mode)
254 
cxgbi_skcb_set_flag(struct sk_buff * skb,enum cxgbi_skcb_flags flag)255 static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
256 					enum cxgbi_skcb_flags flag)
257 {
258 	__set_bit(flag, &(cxgbi_skcb_flags(skb)));
259 }
260 
cxgbi_skcb_clear_flag(struct sk_buff * skb,enum cxgbi_skcb_flags flag)261 static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
262 					enum cxgbi_skcb_flags flag)
263 {
264 	__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
265 }
266 
cxgbi_skcb_test_flag(const struct sk_buff * skb,enum cxgbi_skcb_flags flag)267 static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
268 				       enum cxgbi_skcb_flags flag)
269 {
270 	return test_bit(flag, &(cxgbi_skcb_flags(skb)));
271 }
272 
cxgbi_sock_set_flag(struct cxgbi_sock * csk,enum cxgbi_sock_flags flag)273 static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
274 					enum cxgbi_sock_flags flag)
275 {
276 	__set_bit(flag, &csk->flags);
277 	log_debug(1 << CXGBI_DBG_SOCK,
278 		"csk 0x%p,%u,0x%lx, bit %d.\n",
279 		csk, csk->state, csk->flags, flag);
280 }
281 
cxgbi_sock_clear_flag(struct cxgbi_sock * csk,enum cxgbi_sock_flags flag)282 static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
283 					enum cxgbi_sock_flags flag)
284 {
285 	__clear_bit(flag, &csk->flags);
286 	log_debug(1 << CXGBI_DBG_SOCK,
287 		"csk 0x%p,%u,0x%lx, bit %d.\n",
288 		csk, csk->state, csk->flags, flag);
289 }
290 
cxgbi_sock_flag(struct cxgbi_sock * csk,enum cxgbi_sock_flags flag)291 static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
292 				enum cxgbi_sock_flags flag)
293 {
294 	if (csk == NULL)
295 		return 0;
296 	return test_bit(flag, &csk->flags);
297 }
298 
cxgbi_sock_set_state(struct cxgbi_sock * csk,int state)299 static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
300 {
301 	log_debug(1 << CXGBI_DBG_SOCK,
302 		"csk 0x%p,%u,0x%lx, state -> %u.\n",
303 		csk, csk->state, csk->flags, state);
304 	csk->state = state;
305 }
306 
cxgbi_sock_free(struct kref * kref)307 static inline void cxgbi_sock_free(struct kref *kref)
308 {
309 	struct cxgbi_sock *csk = container_of(kref,
310 						struct cxgbi_sock,
311 						refcnt);
312 	if (csk) {
313 		log_debug(1 << CXGBI_DBG_SOCK,
314 			"free csk 0x%p, state %u, flags 0x%lx\n",
315 			csk, csk->state, csk->flags);
316 		kfree(csk);
317 	}
318 }
319 
__cxgbi_sock_put(const char * fn,struct cxgbi_sock * csk)320 static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
321 {
322 	log_debug(1 << CXGBI_DBG_SOCK,
323 		"%s, put csk 0x%p, ref %u-1.\n",
324 		fn, csk, kref_read(&csk->refcnt));
325 	kref_put(&csk->refcnt, cxgbi_sock_free);
326 }
327 #define cxgbi_sock_put(csk)	__cxgbi_sock_put(__func__, csk)
328 
__cxgbi_sock_get(const char * fn,struct cxgbi_sock * csk)329 static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
330 {
331 	log_debug(1 << CXGBI_DBG_SOCK,
332 		"%s, get csk 0x%p, ref %u+1.\n",
333 		fn, csk, kref_read(&csk->refcnt));
334 	kref_get(&csk->refcnt);
335 }
336 #define cxgbi_sock_get(csk)	__cxgbi_sock_get(__func__, csk)
337 
cxgbi_sock_is_closing(struct cxgbi_sock * csk)338 static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
339 {
340 	return csk->state >= CTP_ACTIVE_CLOSE;
341 }
342 
cxgbi_sock_is_established(struct cxgbi_sock * csk)343 static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
344 {
345 	return csk->state == CTP_ESTABLISHED;
346 }
347 
cxgbi_sock_purge_write_queue(struct cxgbi_sock * csk)348 static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
349 {
350 	struct sk_buff *skb;
351 
352 	while ((skb = __skb_dequeue(&csk->write_queue)))
353 		__kfree_skb(skb);
354 }
355 
cxgbi_sock_compute_wscale(unsigned int win)356 static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
357 {
358 	unsigned int wscale = 0;
359 
360 	while (wscale < 14 && (65535 << wscale) < win)
361 		wscale++;
362 	return wscale;
363 }
364 
alloc_wr(int wrlen,int dlen,gfp_t gfp)365 static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
366 {
367 	struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
368 
369 	if (skb) {
370 		__skb_put(skb, wrlen);
371 		memset(skb->head, 0, wrlen + dlen);
372 	} else
373 		pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
374 	return skb;
375 }
376 
377 
378 /*
379  * The number of WRs needed for an skb depends on the number of fragments
380  * in the skb and whether it has any payload in its main body.  This maps the
381  * length of the gather list represented by an skb into the # of necessary WRs.
382  * The extra two fragments are for iscsi bhs and payload padding.
383  */
384 #define SKB_WR_LIST_SIZE	 (MAX_SKB_FRAGS + 2)
385 
cxgbi_sock_reset_wr_list(struct cxgbi_sock * csk)386 static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
387 {
388 	csk->wr_pending_head = csk->wr_pending_tail = NULL;
389 }
390 
cxgbi_sock_enqueue_wr(struct cxgbi_sock * csk,struct sk_buff * skb)391 static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
392 					  struct sk_buff *skb)
393 {
394 	cxgbi_skcb_tx_wr_next(skb) = NULL;
395 	/*
396 	 * We want to take an extra reference since both us and the driver
397 	 * need to free the packet before it's really freed.
398 	 */
399 	skb_get(skb);
400 
401 	if (!csk->wr_pending_head)
402 		csk->wr_pending_head = skb;
403 	else
404 		cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
405 	csk->wr_pending_tail = skb;
406 }
407 
cxgbi_sock_count_pending_wrs(const struct cxgbi_sock * csk)408 static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
409 {
410 	int n = 0;
411 	const struct sk_buff *skb = csk->wr_pending_head;
412 
413 	while (skb) {
414 		n += skb->csum;
415 		skb = cxgbi_skcb_tx_wr_next(skb);
416 	}
417 	return n;
418 }
419 
cxgbi_sock_peek_wr(const struct cxgbi_sock * csk)420 static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
421 {
422 	return csk->wr_pending_head;
423 }
424 
cxgbi_sock_dequeue_wr(struct cxgbi_sock * csk)425 static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
426 {
427 	struct sk_buff *skb = csk->wr_pending_head;
428 
429 	if (likely(skb)) {
430 		csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
431 		cxgbi_skcb_tx_wr_next(skb) = NULL;
432 	}
433 	return skb;
434 }
435 
436 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
437 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
438 void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
439 void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
440 void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
441 void cxgbi_sock_closed(struct cxgbi_sock *);
442 void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
443 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
444 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
445 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
446 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
447 				int);
448 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
449 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
450 
451 struct cxgbi_hba {
452 	struct net_device *ndev;
453 	struct net_device *vdev;	/* vlan dev */
454 	struct Scsi_Host *shost;
455 	struct cxgbi_device *cdev;
456 	__be32 ipv4addr;
457 	unsigned char port_id;
458 };
459 
460 struct cxgbi_ports_map {
461 	unsigned int max_connect;
462 	unsigned int used;
463 	unsigned short sport_base;
464 	spinlock_t lock;
465 	unsigned int next;
466 	struct cxgbi_sock **port_csk;
467 };
468 
469 #define CXGBI_FLAG_DEV_T3		0x1
470 #define CXGBI_FLAG_DEV_T4		0x2
471 #define CXGBI_FLAG_ADAPTER_RESET	0x4
472 #define CXGBI_FLAG_IPV4_SET		0x10
473 #define CXGBI_FLAG_USE_PPOD_OFLDQ       0x40
474 #define CXGBI_FLAG_DDP_OFF		0x100
475 #define CXGBI_FLAG_DEV_ISO_OFF		0x400
476 
477 struct cxgbi_device {
478 	struct list_head list_head;
479 	struct list_head rcu_node;
480 	unsigned int flags;
481 	struct net_device **ports;
482 	void *lldev;
483 	struct cxgbi_hba **hbas;
484 	const unsigned short *mtus;
485 	unsigned char nmtus;
486 	unsigned char nports;
487 	struct pci_dev *pdev;
488 	struct dentry *debugfs_root;
489 	struct iscsi_transport *itp;
490 	struct module *owner;
491 
492 	unsigned int pfvf;
493 	unsigned int rx_credit_thres;
494 	unsigned int skb_tx_rsvd;
495 	u32 skb_iso_txhdr;
496 	unsigned int skb_rx_extra;	/* for msg coalesced mode */
497 	unsigned int tx_max_size;
498 	unsigned int rx_max_size;
499 	unsigned int rxq_idx_cntr;
500 	struct cxgbi_ports_map pmap;
501 
502 	void (*dev_ddp_cleanup)(struct cxgbi_device *);
503 	struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
504 	int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
505 			       struct cxgbi_task_tag_info *);
506 	void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
507 				  struct cxgbi_ppm *,
508 				  struct cxgbi_task_tag_info *);
509 	int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
510 				    unsigned int, int, int);
511 	int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
512 				   unsigned int, int);
513 
514 	void (*csk_release_offload_resources)(struct cxgbi_sock *);
515 	int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
516 	u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
517 	int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
518 	void (*csk_send_abort_req)(struct cxgbi_sock *);
519 	void (*csk_send_close_req)(struct cxgbi_sock *);
520 	int (*csk_alloc_cpls)(struct cxgbi_sock *);
521 	int (*csk_init_act_open)(struct cxgbi_sock *);
522 
523 	void *dd_data;
524 };
525 #define cxgbi_cdev_priv(cdev)	((cdev)->dd_data)
526 
527 struct cxgbi_conn {
528 	struct cxgbi_endpoint *cep;
529 	struct iscsi_conn *iconn;
530 	struct cxgbi_hba *chba;
531 	u32 task_idx_bits;
532 	unsigned int ddp_full;
533 	unsigned int ddp_tag_full;
534 };
535 
536 struct cxgbi_endpoint {
537 	struct cxgbi_conn *cconn;
538 	struct cxgbi_hba *chba;
539 	struct cxgbi_sock *csk;
540 };
541 
542 struct cxgbi_task_data {
543 #define CXGBI_TASK_SGL_CHECKED	0x1
544 #define CXGBI_TASK_SGL_COPY	0x2
545 	u8 flags;
546 	unsigned short nr_frags;
547 	struct page_frag frags[MAX_SKB_FRAGS];
548 	struct sk_buff *skb;
549 	unsigned int dlen;
550 	unsigned int offset;
551 	unsigned int count;
552 	unsigned int sgoffset;
553 	u32 total_count;
554 	u32 total_offset;
555 	u32 max_xmit_dlength;
556 	struct cxgbi_task_tag_info ttinfo;
557 };
558 #define iscsi_task_cxgbi_data(task) \
559 	((task)->dd_data + sizeof(struct iscsi_tcp_task))
560 
561 struct cxgbi_iso_info {
562 #define CXGBI_ISO_INFO_FSLICE		0x1
563 #define CXGBI_ISO_INFO_LSLICE		0x2
564 #define CXGBI_ISO_INFO_IMM_ENABLE	0x4
565 	u8 flags;
566 	u8 op;
567 	u8 ahs;
568 	u8 num_pdu;
569 	u32 mpdu;
570 	u32 burst_size;
571 	u32 len;
572 	u32 segment_offset;
573 	u32 datasn_offset;
574 	u32 buffer_offset;
575 };
576 
cxgbi_set_iscsi_ipv4(struct cxgbi_hba * chba,__be32 ipaddr)577 static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
578 {
579 	if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
580 		chba->ipv4addr = ipaddr;
581 	else
582 		pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
583 			chba->ndev->name);
584 }
585 
586 struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
587 void cxgbi_device_unregister(struct cxgbi_device *);
588 void cxgbi_device_unregister_all(unsigned int flag);
589 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
590 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
591 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
592 						     int *);
593 int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
594 			const struct scsi_host_template *,
595 			struct scsi_transport_template *);
596 void cxgbi_hbas_remove(struct cxgbi_device *);
597 
598 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
599 			unsigned int max_conn);
600 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
601 
602 void cxgbi_conn_tx_open(struct cxgbi_sock *);
603 void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
604 int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
605 int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
606 int cxgbi_conn_xmit_pdu(struct iscsi_task *);
607 
608 void cxgbi_cleanup_task(struct iscsi_task *task);
609 
610 umode_t cxgbi_attr_is_visible(int param_type, int param);
611 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
612 int cxgbi_set_conn_param(struct iscsi_cls_conn *,
613 			enum iscsi_param, char *, int);
614 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
615 struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
616 int cxgbi_bind_conn(struct iscsi_cls_session *,
617 			struct iscsi_cls_conn *, u64, int);
618 void cxgbi_destroy_session(struct iscsi_cls_session *);
619 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
620 			u16, u16, u32);
621 int cxgbi_set_host_param(struct Scsi_Host *,
622 			enum iscsi_host_param, char *, int);
623 int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
624 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
625 			struct sockaddr *, int);
626 int cxgbi_ep_poll(struct iscsi_endpoint *, int);
627 void cxgbi_ep_disconnect(struct iscsi_endpoint *);
628 
629 int cxgbi_iscsi_init(struct iscsi_transport *,
630 			struct scsi_transport_template **);
631 void cxgbi_iscsi_cleanup(struct iscsi_transport *,
632 			struct scsi_transport_template **);
633 void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
634 int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
635 			unsigned int, unsigned int);
636 int cxgbi_ddp_cleanup(struct cxgbi_device *);
637 void cxgbi_ddp_page_size_factor(int *);
638 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
639 			    struct cxgbi_task_tag_info *,
640 			    struct scatterlist **sg_pp, unsigned int *sg_off);
641 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
642 			struct cxgbi_tag_format *tformat,
643 			unsigned int iscsi_size, unsigned int llimit,
644 			unsigned int start, unsigned int rsvd_factor,
645 			unsigned int edram_start, unsigned int edram_size);
646 #endif	/*__LIBCXGBI_H__*/
647