summaryrefslogtreecommitdiffstats
path: root/include/scsi/libfcoe.h
blob: 71a00fb2279f8975fb398679db7a603e64479187 (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
/*
 * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2007-2008 Intel Corporation.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

#ifndef _LIBFCOE_H
#define _LIBFCOE_H

#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/random.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/fcoe_sysfs.h>

#define FCOE_MAX_CMD_LEN	16	/* Supported CDB length */

/*
 * Max MTU for FCoE: 14 (FCoE header) + 24 (FC header) + 2112 (max FC payload)
 * + 4 (FC CRC) + 4 (FCoE trailer) =  2158 bytes
 */
#define FCOE_MTU	2158

/*
 * FIP tunable parameters.
 */
#define FCOE_CTLR_START_DELAY	2000	/* mS after first adv. to choose FCF */
#define FCOE_CTRL_SOL_TOV	2000	/* min. solicitation interval (mS) */
#define FCOE_CTLR_FCF_LIMIT	20	/* max. number of FCF entries */
#define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3	/* max. VN2VN rport login retries */

/**
 * enum fip_state - internal state of FCoE controller.
 * @FIP_ST_DISABLED: 	controller has been disabled or not yet enabled.
 * @FIP_ST_LINK_WAIT:	the physical link is down or unusable.
 * @FIP_ST_AUTO:	determining whether to use FIP or non-FIP mode.
 * @FIP_ST_NON_FIP:	non-FIP mode selected.
 * @FIP_ST_ENABLED:	FIP mode selected.
 * @FIP_ST_VNMP_START:	VN2VN multipath mode start, wait
 * @FIP_ST_VNMP_PROBE1:	VN2VN sent first probe, listening
 * @FIP_ST_VNMP_PROBE2:	VN2VN sent second probe, listening
 * @FIP_ST_VNMP_CLAIM:	VN2VN sent claim, waiting for responses
 * @FIP_ST_VNMP_UP:	VN2VN multipath mode operation
 */
enum fip_state {
	FIP_ST_DISABLED,
	FIP_ST_LINK_WAIT,
	FIP_ST_AUTO,
	FIP_ST_NON_FIP,
	FIP_ST_ENABLED,
	FIP_ST_VNMP_START,
	FIP_ST_VNMP_PROBE1,
	FIP_ST_VNMP_PROBE2,
	FIP_ST_VNMP_CLAIM,
	FIP_ST_VNMP_UP,
};

/*
 * Modes:
 * The mode is the state that is to be entered after link up.
 * It must not change after fcoe_ctlr_init() sets it.
 */
enum fip_mode {
	FIP_MODE_AUTO,
	FIP_MODE_NON_FIP,
	FIP_MODE_FABRIC,
	FIP_MODE_VN2VN,
};

/**
 * struct fcoe_ctlr - FCoE Controller and FIP state
 * @state:	   internal FIP state for network link and FIP or non-FIP mode.
 * @mode:	   LLD-selected mode.
 * @lp:		   &fc_lport: libfc local port.
 * @sel_fcf:	   currently selected FCF, or NULL.
 * @fcfs:	   list of discovered FCFs.
 * @cdev:          (Optional) pointer to sysfs fcoe_ctlr_device.
 * @fcf_count:	   number of discovered FCF entries.
 * @sol_time:	   time when a multicast solicitation was last sent.
 * @sel_time:	   time after which to select an FCF.
 * @port_ka_time:  time of next port keep-alive.
 * @ctlr_ka_time:  time of next controller keep-alive.
 * @timer:	   timer struct used for all delayed events.
 * @timer_work:	   &work_struct for doing keep-alives and resets.
 * @recv_work:	   &work_struct for receiving FIP frames.
 * @fip_recv_list: list of received FIP frames.
 * @flogi_req:	   clone of FLOGI request sent
 * @rnd_state:	   state for pseudo-random number generator.
 * @port_id:	   proposed or selected local-port ID.
 * @user_mfs:	   configured maximum FC frame size, including FC header.
 * @flogi_oxid:    exchange ID of most recent fabric login.
 * @flogi_req_send: send of FLOGI requested
 * @flogi_count:   number of FLOGI attempts in AUTO mode.
 * @map_dest:	   use the FC_MAP mode for destination MAC addresses.
 * @fip_resp:	   start FIP VLAN discovery responder
 * @spma:	   supports SPMA server-provided MACs mode
 * @probe_tries:   number of FC_IDs probed
 * @priority:      DCBx FCoE APP priority
 * @dest_addr:	   MAC address of the selected FC forwarder.
 * @ctl_src_addr:  the native MAC address of our local port.
 * @send:	   LLD-supplied function to handle sending FIP Ethernet frames
 * @update_mac:    LLD-supplied function to handle changes to MAC addresses.
 * @get_src_addr:  LLD-supplied function to supply a source MAC address.
 * @ctlr_mutex:	   lock protecting this structure.
 * @ctlr_lock:     spinlock covering flogi_req
 *
 * This structure is used by all FCoE drivers.  It contains information
 * needed by all FCoE low-level drivers (LLDs) as well as internal state
 * for FIP, and fields shared with the LLDS.
 */
struct fcoe_ctlr {
	enum fip_state state;
	enum fip_mode mode;
	struct fc_lport *lp;
	struct fcoe_fcf *sel_fcf;
	struct list_head fcfs;
	struct fcoe_ctlr_device *cdev;
	u16 fcf_count;
	unsigned long sol_time;
	unsigned long sel_time;
	unsigned long port_ka_time;
	unsigned long ctlr_ka_time;
	struct timer_list timer;
	struct work_struct timer_work;
	struct work_struct recv_work;
	struct sk_buff_head fip_recv_list;
	struct sk_buff *flogi_req;

	struct rnd_state rnd_state;
	u32 port_id;

	u16 user_mfs;
	u16 flogi_oxid;
	u8 flogi_req_send;
	u8 flogi_count;
	bool map_dest;
	bool fip_resp;
	u8 spma;
	u8 probe_tries;
	u8 priority;
	u8 dest_addr[ETH_ALEN];
	u8 ctl_src_addr[ETH_ALEN];

	void (*send)(struct fcoe_ctlr *, struct sk_buff *);
	void (*update_mac)(struct fc_lport *, u8 *addr);
	u8 * (*get_src_addr)(struct fc_lport *);
	struct mutex ctlr_mutex;
	spinlock_t ctlr_lock;
};

/**
 * fcoe_ctlr_priv() - Return the private data from a fcoe_ctlr
 * @cltr: The fcoe_ctlr whose private data will be returned
 */
static inline void *fcoe_ctlr_priv(const struct fcoe_ctlr *ctlr)
{
	return (void *)(ctlr + 1);
}

/*
 * This assumes that the fcoe_ctlr (x) is allocated with the fcoe_ctlr_device.
 */
#define fcoe_ctlr_to_ctlr_dev(x)					\
	(x)->cdev

/**
 * struct fcoe_fcf - Fibre-Channel Forwarder
 * @list:	 list linkage
 * @event_work:  Work for FC Transport actions queue
 * @event:       The event to be processed
 * @fip:         The controller that the FCF was discovered on
 * @fcf_dev:     The associated fcoe_fcf_device instance
 * @time:	 system time (jiffies) when an advertisement was last received
 * @switch_name: WWN of switch from advertisement
 * @fabric_name: WWN of fabric from advertisement
 * @fc_map:	 FC_MAP value from advertisement
 * @fcf_mac:	 Ethernet address of the FCF for FIP traffic
 * @fcoe_mac:	 Ethernet address of the FCF for FCoE traffic
 * @vfid:	 virtual fabric ID
 * @pri:	 selection priority, smaller values are better
 * @flogi_sent:	 current FLOGI sent to this FCF
 * @flags:	 flags received from advertisement
 * @fka_period:	 keep-alive period, in jiffies
 *
 * A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
 * passes FCoE frames on to an FC fabric.  This structure represents
 * one FCF from which advertisements have been received.
 *
 * When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
 * @fcf_mac together form the lookup key.
 */
struct fcoe_fcf {
	struct list_head list;
	struct work_struct event_work;
	struct fcoe_ctlr *fip;
	struct fcoe_fcf_device *fcf_dev;
	unsigned long time;

	u64 switch_name;
	u64 fabric_name;
	u32 fc_map;
	u16 vfid;
	u8 fcf_mac[ETH_ALEN];
	u8 fcoe_mac[ETH_ALEN];

	u8 pri;
	u8 flogi_sent;
	u16 flags;
	u32 fka_period;
	u8 fd_flags:1;
};

#define fcoe_fcf_to_fcf_dev(x)			\
	((x)->fcf_dev)

/**
 * struct fcoe_rport - VN2VN remote port
 * @time:	time of create or last beacon packet received from node
 * @fcoe_len:	max FCoE frame size, not including VLAN or Ethernet headers
 * @flags:	flags from probe or claim
 * @login_count: number of unsuccessful rport logins to this port
 * @enode_mac:	E_Node control MAC address
 * @vn_mac:	VN_Node assigned MAC address for data
 */
struct fcoe_rport {
	struct fc_rport_priv rdata;
	unsigned long time;
	u16 fcoe_len;
	u16 flags;
	u8 login_count;
	u8 enode_mac[ETH_ALEN];
	u8 vn_mac[ETH_ALEN];
};

/* FIP API functions */
void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_mode);
void fcoe_ctlr_destroy(struct fcoe_ctlr *);
void fcoe_ctlr_link_up(struct fcoe_ctlr *);
int fcoe_ctlr_link_down(struct fcoe_ctlr *);
int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *);
void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *,
			 struct fc_frame *);

/* libfcoe funcs */
u64 fcoe_wwn_from_mac(unsigned char mac[ETH_ALEN], unsigned int scheme,
		      unsigned int port);
int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *,
		      const struct libfc_function_template *, int init_fcp);
u32 fcoe_fc_crc(struct fc_frame *fp);
int fcoe_start_io(struct sk_buff *skb);
int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type);
void __fcoe_get_lesb(struct fc_lport *lport, struct fc_els_lesb *fc_lesb,
		     struct net_device *netdev);
void fcoe_wwn_to_str(u64 wwn, char *buf, int len);
int fcoe_validate_vport_create(struct fc_vport *vport);
int fcoe_link_speed_update(struct fc_lport *);
void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev);

/**
 * is_fip_mode() - returns true if FIP mode selected.
 * @fip:	FCoE controller.
 */
static inline bool is_fip_mode(struct fcoe_ctlr *fip)
{
	return fip->state == FIP_ST_ENABLED;
}

/* helper for FCoE SW HBA drivers, can include subven and subdev if needed. The
 * modpost would use pci_device_id table to auto-generate formatted module alias
 * into the corresponding .mod.c file, but there may or may not be a pci device
 * id table for FCoE drivers so we use the following helper for build the fcoe
 * driver module alias.
 */
#define MODULE_ALIAS_FCOE_PCI(ven, dev) \
	MODULE_ALIAS("fcoe-pci:"	\
		"v" __stringify(ven)	\
		"d" __stringify(dev) "sv*sd*bc*sc*i*")

/* the name of the default FCoE transport driver fcoe.ko */
#define FCOE_TRANSPORT_DEFAULT	"fcoe"

/* struct fcoe_transport - The FCoE transport interface
 * @name:	a vendor specific name for their FCoE transport driver
 * @attached:	whether this transport is already attached
 * @list:	list linkage to all attached transports
 * @match:	handler to allow the transport driver to match up a given netdev
 * @alloc:      handler to allocate per-instance FCoE structures
 *		(no discovery or login)
 * @create:	handler to sysfs entry of create for FCoE instances
 * @destroy:    handler to delete per-instance FCoE structures
 *		(frees all memory)
 * @enable:	handler to sysfs entry of enable for FCoE instances
 * @disable:	handler to sysfs entry of disable for FCoE instances
 */
struct fcoe_transport {
	char name[IFNAMSIZ];
	bool attached;
	struct list_head list;
	bool (*match) (struct net_device *device);
	int (*alloc) (struct net_device *device);
	int (*create) (struct net_device *device, enum fip_mode fip_mode);
	int (*destroy) (struct net_device *device);
	int (*enable) (struct net_device *device);
	int (*disable) (struct net_device *device);
};

/**
 * struct fcoe_percpu_s - The context for FCoE receive thread(s)
 * @kthread:	    The thread context (used by bnx2fc)
 * @work:	    The work item (used by fcoe)
 * @fcoe_rx_list:   The queue of pending packets to process
 * @page:	    The memory page for calculating frame trailer CRCs
 * @crc_eof_offset: The offset into the CRC page pointing to available
 *		    memory for a new trailer
 */
struct fcoe_percpu_s {
	struct task_struct *kthread;
	struct work_struct work;
	struct sk_buff_head fcoe_rx_list;
	struct page *crc_eof_page;
	int crc_eof_offset;
};

/**
 * struct fcoe_port - The FCoE private structure
 * @priv:		       The associated fcoe interface. The structure is
 *			       defined by the low level driver
 * @lport:		       The associated local port
 * @fcoe_pending_queue:	       The pending Rx queue of skbs
 * @fcoe_pending_queue_active: Indicates if the pending queue is active
 * @max_queue_depth:	       Max queue depth of pending queue
 * @min_queue_depth:	       Min queue depth of pending queue
 * @timer:		       The queue timer
 * @destroy_work:	       Handle for work context
 *			       (to prevent RTNL deadlocks)
 * @data_srt_addr:	       Source address for data
 *
 * An instance of this structure is to be allocated along with the
 * Scsi_Host and libfc fc_lport structures.
 */
struct fcoe_port {
	void		      *priv;
	struct fc_lport	      *lport;
	struct sk_buff_head   fcoe_pending_queue;
	u8		      fcoe_pending_queue_active;
	u32		      max_queue_depth;
	u32		      min_queue_depth;
	struct timer_list     timer;
	struct work_struct    destroy_work;
	u8		      data_src_addr[ETH_ALEN];
	struct net_device * (*get_netdev)(const struct fc_lport *lport);
};

/**
 * fcoe_get_netdev() - Return the net device associated with a local port
 * @lport: The local port to get the net device from
 */
static inline struct net_device *fcoe_get_netdev(const struct fc_lport *lport)
{
	struct fcoe_port *port = ((struct fcoe_port *)lport_priv(lport));

	return (port->get_netdev) ? port->get_netdev(lport) : NULL;
}

void fcoe_clean_pending_queue(struct fc_lport *);
void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb);
void fcoe_queue_timer(struct timer_list *t);
int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
			   struct fcoe_percpu_s *fps);

/* FCoE Sysfs helpers */
void fcoe_fcf_get_selected(struct fcoe_fcf_device *);
void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *);

/**
 * struct netdev_list
 * A mapping from netdevice to fcoe_transport
 */
struct fcoe_netdev_mapping {
	struct list_head list;
	struct net_device *netdev;
	struct fcoe_transport *ft;
};

/* fcoe transports registration and deregistration */
int fcoe_transport_attach(struct fcoe_transport *ft);
int fcoe_transport_detach(struct fcoe_transport *ft);

/* sysfs store handler for ctrl_control interface */
ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
			       const char *buf, size_t count);
ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus,
				const char *buf, size_t count);

#endif /* _LIBFCOE_H */