1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
4  * Copyright (c) 2007-2008 Intel Corporation.  All rights reserved.
5  *
6  * Maintained at www.Open-FCoE.org
7  */
8 
9 #ifndef _LIBFCOE_H
10 #define _LIBFCOE_H
11 
12 #include <linux/etherdevice.h>
13 #include <linux/if_ether.h>
14 #include <linux/netdevice.h>
15 #include <linux/skbuff.h>
16 #include <linux/workqueue.h>
17 #include <linux/local_lock.h>
18 #include <linux/random.h>
19 #include <scsi/fc/fc_fcoe.h>
20 #include <scsi/libfc.h>
21 #include <scsi/fcoe_sysfs.h>
22 
23 #define FCOE_MAX_CMD_LEN	16	/* Supported CDB length */
24 
25 /*
26  * Max MTU for FCoE: 14 (FCoE header) + 24 (FC header) + 2112 (max FC payload)
27  * + 4 (FC CRC) + 4 (FCoE trailer) =  2158 bytes
28  */
29 #define FCOE_MTU	2158
30 
31 /*
32  * FIP tunable parameters.
33  */
34 #define FCOE_CTLR_START_DELAY	2000	/* mS after first adv. to choose FCF */
35 #define FCOE_CTLR_SOL_TOV	2000	/* min. solicitation interval (mS) */
36 #define FCOE_CTLR_FCF_LIMIT	20	/* max. number of FCF entries */
37 #define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3	/* max. VN2VN rport login retries */
38 
39 /**
40  * enum fip_state - internal state of FCoE controller.
41  * @FIP_ST_DISABLED: 	controller has been disabled or not yet enabled.
42  * @FIP_ST_LINK_WAIT:	the physical link is down or unusable.
43  * @FIP_ST_AUTO:	determining whether to use FIP or non-FIP mode.
44  * @FIP_ST_NON_FIP:	non-FIP mode selected.
45  * @FIP_ST_ENABLED:	FIP mode selected.
46  * @FIP_ST_VNMP_START:	VN2VN multipath mode start, wait
47  * @FIP_ST_VNMP_PROBE1:	VN2VN sent first probe, listening
48  * @FIP_ST_VNMP_PROBE2:	VN2VN sent second probe, listening
49  * @FIP_ST_VNMP_CLAIM:	VN2VN sent claim, waiting for responses
50  * @FIP_ST_VNMP_UP:	VN2VN multipath mode operation
51  */
52 enum fip_state {
53 	FIP_ST_DISABLED,
54 	FIP_ST_LINK_WAIT,
55 	FIP_ST_AUTO,
56 	FIP_ST_NON_FIP,
57 	FIP_ST_ENABLED,
58 	FIP_ST_VNMP_START,
59 	FIP_ST_VNMP_PROBE1,
60 	FIP_ST_VNMP_PROBE2,
61 	FIP_ST_VNMP_CLAIM,
62 	FIP_ST_VNMP_UP,
63 };
64 
65 /*
66  * Modes:
67  * The mode is the state that is to be entered after link up.
68  * It must not change after fcoe_ctlr_init() sets it.
69  */
70 enum fip_mode {
71 	FIP_MODE_AUTO,
72 	FIP_MODE_NON_FIP,
73 	FIP_MODE_FABRIC,
74 	FIP_MODE_VN2VN,
75 };
76 
77 /**
78  * struct fcoe_ctlr - FCoE Controller and FIP state
79  * @state:	   internal FIP state for network link and FIP or non-FIP mode.
80  * @mode:	   LLD-selected mode.
81  * @lp:		   &fc_lport: libfc local port.
82  * @sel_fcf:	   currently selected FCF, or NULL.
83  * @fcfs:	   list of discovered FCFs.
84  * @cdev:          (Optional) pointer to sysfs fcoe_ctlr_device.
85  * @fcf_count:	   number of discovered FCF entries.
86  * @sol_time:	   time when a multicast solicitation was last sent.
87  * @sel_time:	   time after which to select an FCF.
88  * @port_ka_time:  time of next port keep-alive.
89  * @ctlr_ka_time:  time of next controller keep-alive.
90  * @timer:	   timer struct used for all delayed events.
91  * @timer_work:	   &work_struct for doing keep-alives and resets.
92  * @recv_work:	   &work_struct for receiving FIP frames.
93  * @fip_recv_list: list of received FIP frames.
94  * @flogi_req:	   clone of FLOGI request sent
95  * @rnd_state:	   state for pseudo-random number generator.
96  * @port_id:	   proposed or selected local-port ID.
97  * @user_mfs:	   configured maximum FC frame size, including FC header.
98  * @flogi_oxid:    exchange ID of most recent fabric login.
99  * @flogi_req_send: send of FLOGI requested
100  * @flogi_count:   number of FLOGI attempts in AUTO mode.
101  * @map_dest:	   use the FC_MAP mode for destination MAC addresses.
102  * @fip_resp:	   start FIP VLAN discovery responder
103  * @spma:	   supports SPMA server-provided MACs mode
104  * @probe_tries:   number of FC_IDs probed
105  * @priority:      DCBx FCoE APP priority
106  * @dest_addr:	   MAC address of the selected FC forwarder.
107  * @ctl_src_addr:  the native MAC address of our local port.
108  * @send:	   LLD-supplied function to handle sending FIP Ethernet frames
109  * @update_mac:    LLD-supplied function to handle changes to MAC addresses.
110  * @get_src_addr:  LLD-supplied function to supply a source MAC address.
111  * @ctlr_mutex:	   lock protecting this structure.
112  * @ctlr_lock:     spinlock covering flogi_req
113  *
114  * This structure is used by all FCoE drivers.  It contains information
115  * needed by all FCoE low-level drivers (LLDs) as well as internal state
116  * for FIP, and fields shared with the LLDS.
117  */
118 struct fcoe_ctlr {
119 	enum fip_state state;
120 	enum fip_mode mode;
121 	struct fc_lport *lp;
122 	struct fcoe_fcf *sel_fcf;
123 	struct list_head fcfs;
124 	struct fcoe_ctlr_device *cdev;
125 	u16 fcf_count;
126 	unsigned long sol_time;
127 	unsigned long sel_time;
128 	unsigned long port_ka_time;
129 	unsigned long ctlr_ka_time;
130 	struct timer_list timer;
131 	struct work_struct timer_work;
132 	struct work_struct recv_work;
133 	struct sk_buff_head fip_recv_list;
134 	struct sk_buff *flogi_req;
135 
136 	struct rnd_state rnd_state;
137 	u32 port_id;
138 
139 	u16 user_mfs;
140 	u16 flogi_oxid;
141 	u8 flogi_req_send;
142 	u8 flogi_count;
143 	bool map_dest;
144 	bool fip_resp;
145 	u8 spma;
146 	u8 probe_tries;
147 	u8 priority;
148 	u8 dest_addr[ETH_ALEN];
149 	u8 ctl_src_addr[ETH_ALEN];
150 
151 	void (*send)(struct fcoe_ctlr *, struct sk_buff *);
152 	void (*update_mac)(struct fc_lport *, u8 *addr);
153 	u8 * (*get_src_addr)(struct fc_lport *);
154 	struct mutex ctlr_mutex;
155 	spinlock_t ctlr_lock;
156 };
157 
158 /**
159  * fcoe_ctlr_priv() - Return the private data from a fcoe_ctlr
160  * @cltr: The fcoe_ctlr whose private data will be returned
161  */
fcoe_ctlr_priv(const struct fcoe_ctlr * ctlr)162 static inline void *fcoe_ctlr_priv(const struct fcoe_ctlr *ctlr)
163 {
164 	return (void *)(ctlr + 1);
165 }
166 
167 /*
168  * This assumes that the fcoe_ctlr (x) is allocated with the fcoe_ctlr_device.
169  */
170 #define fcoe_ctlr_to_ctlr_dev(x)					\
171 	(x)->cdev
172 
173 /**
174  * struct fcoe_fcf - Fibre-Channel Forwarder
175  * @list:	 list linkage
176  * @event_work:  Work for FC Transport actions queue
177  * @event:       The event to be processed
178  * @fip:         The controller that the FCF was discovered on
179  * @fcf_dev:     The associated fcoe_fcf_device instance
180  * @time:	 system time (jiffies) when an advertisement was last received
181  * @switch_name: WWN of switch from advertisement
182  * @fabric_name: WWN of fabric from advertisement
183  * @fc_map:	 FC_MAP value from advertisement
184  * @fcf_mac:	 Ethernet address of the FCF for FIP traffic
185  * @fcoe_mac:	 Ethernet address of the FCF for FCoE traffic
186  * @vfid:	 virtual fabric ID
187  * @pri:	 selection priority, smaller values are better
188  * @flogi_sent:	 current FLOGI sent to this FCF
189  * @flags:	 flags received from advertisement
190  * @fka_period:	 keep-alive period, in jiffies
191  *
192  * A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
193  * passes FCoE frames on to an FC fabric.  This structure represents
194  * one FCF from which advertisements have been received.
195  *
196  * When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
197  * @fcf_mac together form the lookup key.
198  */
199 struct fcoe_fcf {
200 	struct list_head list;
201 	struct work_struct event_work;
202 	struct fcoe_ctlr *fip;
203 	struct fcoe_fcf_device *fcf_dev;
204 	unsigned long time;
205 
206 	u64 switch_name;
207 	u64 fabric_name;
208 	u32 fc_map;
209 	u16 vfid;
210 	u8 fcf_mac[ETH_ALEN];
211 	u8 fcoe_mac[ETH_ALEN];
212 
213 	u8 pri;
214 	u8 flogi_sent;
215 	u16 flags;
216 	u32 fka_period;
217 	u8 fd_flags:1;
218 };
219 
220 #define fcoe_fcf_to_fcf_dev(x)			\
221 	((x)->fcf_dev)
222 
223 /**
224  * struct fcoe_rport - VN2VN remote port
225  * @time:	time of create or last beacon packet received from node
226  * @fcoe_len:	max FCoE frame size, not including VLAN or Ethernet headers
227  * @flags:	flags from probe or claim
228  * @login_count: number of unsuccessful rport logins to this port
229  * @enode_mac:	E_Node control MAC address
230  * @vn_mac:	VN_Node assigned MAC address for data
231  */
232 struct fcoe_rport {
233 	struct fc_rport_priv rdata;
234 	unsigned long time;
235 	u16 fcoe_len;
236 	u16 flags;
237 	u8 login_count;
238 	u8 enode_mac[ETH_ALEN];
239 	u8 vn_mac[ETH_ALEN];
240 };
241 
242 /* FIP API functions */
243 void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_mode);
244 void fcoe_ctlr_destroy(struct fcoe_ctlr *);
245 void fcoe_ctlr_link_up(struct fcoe_ctlr *);
246 int fcoe_ctlr_link_down(struct fcoe_ctlr *);
247 int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *);
248 void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
249 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *,
250 			 struct fc_frame *);
251 
252 /* libfcoe funcs */
253 u64 fcoe_wwn_from_mac(unsigned char mac[ETH_ALEN], unsigned int scheme,
254 		      unsigned int port);
255 int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *,
256 		      const struct libfc_function_template *, int init_fcp);
257 u32 fcoe_fc_crc(struct fc_frame *fp);
258 int fcoe_start_io(struct sk_buff *skb);
259 int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type);
260 void __fcoe_get_lesb(struct fc_lport *lport, struct fc_els_lesb *fc_lesb,
261 		     struct net_device *netdev);
262 void fcoe_wwn_to_str(u64 wwn, char *buf, int len);
263 int fcoe_validate_vport_create(struct fc_vport *vport);
264 int fcoe_link_speed_update(struct fc_lport *);
265 void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
266 void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev);
267 
268 /**
269  * is_fip_mode() - returns true if FIP mode selected.
270  * @fip:	FCoE controller.
271  */
is_fip_mode(struct fcoe_ctlr * fip)272 static inline bool is_fip_mode(struct fcoe_ctlr *fip)
273 {
274 	return fip->state == FIP_ST_ENABLED;
275 }
276 
277 /* helper for FCoE SW HBA drivers, can include subven and subdev if needed. The
278  * modpost would use pci_device_id table to auto-generate formatted module alias
279  * into the corresponding .mod.c file, but there may or may not be a pci device
280  * id table for FCoE drivers so we use the following helper for build the fcoe
281  * driver module alias.
282  */
283 #define MODULE_ALIAS_FCOE_PCI(ven, dev) \
284 	MODULE_ALIAS("fcoe-pci:"	\
285 		"v" __stringify(ven)	\
286 		"d" __stringify(dev) "sv*sd*bc*sc*i*")
287 
288 /* the name of the default FCoE transport driver fcoe.ko */
289 #define FCOE_TRANSPORT_DEFAULT	"fcoe"
290 
291 /* struct fcoe_transport - The FCoE transport interface
292  * @name:	a vendor specific name for their FCoE transport driver
293  * @attached:	whether this transport is already attached
294  * @list:	list linkage to all attached transports
295  * @match:	handler to allow the transport driver to match up a given netdev
296  * @alloc:      handler to allocate per-instance FCoE structures
297  *		(no discovery or login)
298  * @create:	handler to sysfs entry of create for FCoE instances
299  * @destroy:    handler to delete per-instance FCoE structures
300  *		(frees all memory)
301  * @enable:	handler to sysfs entry of enable for FCoE instances
302  * @disable:	handler to sysfs entry of disable for FCoE instances
303  */
304 struct fcoe_transport {
305 	char name[IFNAMSIZ];
306 	bool attached;
307 	struct list_head list;
308 	bool (*match) (struct net_device *device);
309 	int (*alloc) (struct net_device *device);
310 	int (*create) (struct net_device *device, enum fip_mode fip_mode);
311 	int (*destroy) (struct net_device *device);
312 	int (*enable) (struct net_device *device);
313 	int (*disable) (struct net_device *device);
314 };
315 
316 /**
317  * struct fcoe_percpu_s - The context for FCoE receive thread(s)
318  * @kthread:	    The thread context (used by bnx2fc)
319  * @work:	    The work item (used by fcoe)
320  * @fcoe_rx_list:   The queue of pending packets to process
321  * @page:	    The memory page for calculating frame trailer CRCs
322  * @crc_eof_offset: The offset into the CRC page pointing to available
323  *		    memory for a new trailer
324  */
325 struct fcoe_percpu_s {
326 	struct task_struct *kthread;
327 	struct work_struct work;
328 	struct sk_buff_head fcoe_rx_list;
329 	struct page *crc_eof_page;
330 	int crc_eof_offset;
331 	local_lock_t lock;
332 };
333 
334 /**
335  * struct fcoe_port - The FCoE private structure
336  * @priv:		       The associated fcoe interface. The structure is
337  *			       defined by the low level driver
338  * @lport:		       The associated local port
339  * @fcoe_pending_queue:	       The pending Rx queue of skbs
340  * @fcoe_pending_queue_active: Indicates if the pending queue is active
341  * @max_queue_depth:	       Max queue depth of pending queue
342  * @min_queue_depth:	       Min queue depth of pending queue
343  * @timer:		       The queue timer
344  * @destroy_work:	       Handle for work context
345  *			       (to prevent RTNL deadlocks)
346  * @data_srt_addr:	       Source address for data
347  *
348  * An instance of this structure is to be allocated along with the
349  * Scsi_Host and libfc fc_lport structures.
350  */
351 struct fcoe_port {
352 	void		      *priv;
353 	struct fc_lport	      *lport;
354 	struct sk_buff_head   fcoe_pending_queue;
355 	u8		      fcoe_pending_queue_active;
356 	u32		      max_queue_depth;
357 	u32		      min_queue_depth;
358 	struct timer_list     timer;
359 	struct work_struct    destroy_work;
360 	u8		      data_src_addr[ETH_ALEN];
361 	struct net_device * (*get_netdev)(const struct fc_lport *lport);
362 };
363 
364 /**
365  * fcoe_get_netdev() - Return the net device associated with a local port
366  * @lport: The local port to get the net device from
367  */
fcoe_get_netdev(const struct fc_lport * lport)368 static inline struct net_device *fcoe_get_netdev(const struct fc_lport *lport)
369 {
370 	struct fcoe_port *port = ((struct fcoe_port *)lport_priv(lport));
371 
372 	return (port->get_netdev) ? port->get_netdev(lport) : NULL;
373 }
374 
375 void fcoe_clean_pending_queue(struct fc_lport *);
376 void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb);
377 void fcoe_queue_timer(struct timer_list *t);
378 int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
379 			   struct fcoe_percpu_s *fps);
380 
381 /* FCoE Sysfs helpers */
382 void fcoe_fcf_get_selected(struct fcoe_fcf_device *);
383 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *);
384 
385 /**
386  * struct netdev_list
387  * A mapping from netdevice to fcoe_transport
388  */
389 struct fcoe_netdev_mapping {
390 	struct list_head list;
391 	struct net_device *netdev;
392 	struct fcoe_transport *ft;
393 };
394 
395 /* fcoe transports registration and deregistration */
396 int fcoe_transport_attach(struct fcoe_transport *ft);
397 int fcoe_transport_detach(struct fcoe_transport *ft);
398 
399 /* sysfs store handler for ctrl_control interface */
400 ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
401 			       const char *buf, size_t count);
402 ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus,
403 				const char *buf, size_t count);
404 
405 #endif /* _LIBFCOE_H */
406 
407 
408