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Robert Love85b4aa42008-12-09 15:10:24 -08001/*
Joe Eykholt97c83892009-03-17 11:42:40 -07002 * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007-2008 Intel Corporation. All rights reserved.
Robert Love85b4aa42008-12-09 15:10:24 -08004 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Maintained at www.Open-FCoE.org
19 */
20
21#ifndef _LIBFCOE_H
22#define _LIBFCOE_H
23
Joe Eykholt97c83892009-03-17 11:42:40 -070024#include <linux/etherdevice.h>
25#include <linux/if_ether.h>
Robert Love85b4aa42008-12-09 15:10:24 -080026#include <linux/netdevice.h>
27#include <linux/skbuff.h>
Joe Eykholt97c83892009-03-17 11:42:40 -070028#include <linux/workqueue.h>
Joe Eykholte10f8c62010-07-20 15:20:30 -070029#include <linux/random.h>
Robert Love85b4aa42008-12-09 15:10:24 -080030#include <scsi/fc/fc_fcoe.h>
31#include <scsi/libfc.h>
32
Vasu Devda87bfa2010-04-09 14:22:59 -070033#define FCOE_MAX_CMD_LEN 16 /* Supported CDB length */
34
Joe Eykholt97c83892009-03-17 11:42:40 -070035/*
Bhanu Prakash Gollapudif4d2b2b2011-02-25 15:03:12 -080036 * Max MTU for FCoE: 14 (FCoE header) + 24 (FC header) + 2112 (max FC payload)
37 * + 4 (FC CRC) + 4 (FCoE trailer) = 2158 bytes
38 */
39#define FCOE_MTU 2158
40
41/*
Joe Eykholt97c83892009-03-17 11:42:40 -070042 * FIP tunable parameters.
43 */
44#define FCOE_CTLR_START_DELAY 2000 /* mS after first adv. to choose FCF */
45#define FCOE_CTRL_SOL_TOV 2000 /* min. solicitation interval (mS) */
46#define FCOE_CTLR_FCF_LIMIT 20 /* max. number of FCF entries */
Joe Eykholte10f8c62010-07-20 15:20:30 -070047#define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3 /* max. VN2VN rport login retries */
Joe Eykholt97c83892009-03-17 11:42:40 -070048
49/**
50 * enum fip_state - internal state of FCoE controller.
51 * @FIP_ST_DISABLED: controller has been disabled or not yet enabled.
52 * @FIP_ST_LINK_WAIT: the physical link is down or unusable.
53 * @FIP_ST_AUTO: determining whether to use FIP or non-FIP mode.
54 * @FIP_ST_NON_FIP: non-FIP mode selected.
55 * @FIP_ST_ENABLED: FIP mode selected.
Joe Eykholte10f8c62010-07-20 15:20:30 -070056 * @FIP_ST_VNMP_START: VN2VN multipath mode start, wait
57 * @FIP_ST_VNMP_PROBE1: VN2VN sent first probe, listening
58 * @FIP_ST_VNMP_PROBE2: VN2VN sent second probe, listening
59 * @FIP_ST_VNMP_CLAIM: VN2VN sent claim, waiting for responses
60 * @FIP_ST_VNMP_UP: VN2VN multipath mode operation
Joe Eykholt97c83892009-03-17 11:42:40 -070061 */
62enum fip_state {
63 FIP_ST_DISABLED,
64 FIP_ST_LINK_WAIT,
65 FIP_ST_AUTO,
66 FIP_ST_NON_FIP,
67 FIP_ST_ENABLED,
Joe Eykholte10f8c62010-07-20 15:20:30 -070068 FIP_ST_VNMP_START,
69 FIP_ST_VNMP_PROBE1,
70 FIP_ST_VNMP_PROBE2,
71 FIP_ST_VNMP_CLAIM,
72 FIP_ST_VNMP_UP,
Joe Eykholt97c83892009-03-17 11:42:40 -070073};
74
Joe Eykholt3d902ac2010-07-20 15:19:58 -070075/*
76 * Modes:
77 * The mode is the state that is to be entered after link up.
78 * It must not change after fcoe_ctlr_init() sets it.
79 */
80#define FIP_MODE_AUTO FIP_ST_AUTO
81#define FIP_MODE_NON_FIP FIP_ST_NON_FIP
82#define FIP_MODE_FABRIC FIP_ST_ENABLED
Joe Eykholte10f8c62010-07-20 15:20:30 -070083#define FIP_MODE_VN2VN FIP_ST_VNMP_START
Joe Eykholt3d902ac2010-07-20 15:19:58 -070084
Joe Eykholt97c83892009-03-17 11:42:40 -070085/**
Robert Love70b51aa2009-11-03 11:47:45 -080086 * struct fcoe_ctlr - FCoE Controller and FIP state
87 * @state: internal FIP state for network link and FIP or non-FIP mode.
Joe Eykholt22bcd222009-11-03 11:48:11 -080088 * @mode: LLD-selected mode.
Robert Love70b51aa2009-11-03 11:47:45 -080089 * @lp: &fc_lport: libfc local port.
90 * @sel_fcf: currently selected FCF, or NULL.
91 * @fcfs: list of discovered FCFs.
92 * @fcf_count: number of discovered FCF entries.
93 * @sol_time: time when a multicast solicitation was last sent.
94 * @sel_time: time after which to select an FCF.
95 * @port_ka_time: time of next port keep-alive.
96 * @ctlr_ka_time: time of next controller keep-alive.
97 * @timer: timer struct used for all delayed events.
Joe Eykholt42913652010-03-12 16:08:23 -080098 * @timer_work: &work_struct for doing keep-alives and resets.
Robert Love70b51aa2009-11-03 11:47:45 -080099 * @recv_work: &work_struct for receiving FIP frames.
Joe Eykholt97c83892009-03-17 11:42:40 -0700100 * @fip_recv_list: list of received FIP frames.
Joe Eykholt794d98e2010-11-30 16:19:56 -0800101 * @flogi_req: clone of FLOGI request sent
Joe Eykholte10f8c62010-07-20 15:20:30 -0700102 * @rnd_state: state for pseudo-random number generator.
103 * @port_id: proposed or selected local-port ID.
Robert Love70b51aa2009-11-03 11:47:45 -0800104 * @user_mfs: configured maximum FC frame size, including FC header.
105 * @flogi_oxid: exchange ID of most recent fabric login.
Joe Eykholt794d98e2010-11-30 16:19:56 -0800106 * @flogi_req_send: send of FLOGI requested
Robert Love70b51aa2009-11-03 11:47:45 -0800107 * @flogi_count: number of FLOGI attempts in AUTO mode.
Robert Love70b51aa2009-11-03 11:47:45 -0800108 * @map_dest: use the FC_MAP mode for destination MAC addresses.
109 * @spma: supports SPMA server-provided MACs mode
Joe Eykholte10f8c62010-07-20 15:20:30 -0700110 * @probe_tries: number of FC_IDs probed
Robert Love70b51aa2009-11-03 11:47:45 -0800111 * @dest_addr: MAC address of the selected FC forwarder.
112 * @ctl_src_addr: the native MAC address of our local port.
113 * @send: LLD-supplied function to handle sending FIP Ethernet frames
114 * @update_mac: LLD-supplied function to handle changes to MAC addresses.
115 * @get_src_addr: LLD-supplied function to supply a source MAC address.
Joe Eykholtfdb068c2010-07-20 15:19:47 -0700116 * @ctlr_mutex: lock protecting this structure.
Joe Eykholt794d98e2010-11-30 16:19:56 -0800117 * @ctlr_lock: spinlock covering flogi_req
Joe Eykholt97c83892009-03-17 11:42:40 -0700118 *
119 * This structure is used by all FCoE drivers. It contains information
120 * needed by all FCoE low-level drivers (LLDs) as well as internal state
121 * for FIP, and fields shared with the LLDS.
122 */
123struct fcoe_ctlr {
124 enum fip_state state;
Joe Eykholt22bcd222009-11-03 11:48:11 -0800125 enum fip_state mode;
Joe Eykholt97c83892009-03-17 11:42:40 -0700126 struct fc_lport *lp;
127 struct fcoe_fcf *sel_fcf;
128 struct list_head fcfs;
129 u16 fcf_count;
130 unsigned long sol_time;
131 unsigned long sel_time;
132 unsigned long port_ka_time;
133 unsigned long ctlr_ka_time;
134 struct timer_list timer;
Joe Eykholt42913652010-03-12 16:08:23 -0800135 struct work_struct timer_work;
Joe Eykholt97c83892009-03-17 11:42:40 -0700136 struct work_struct recv_work;
137 struct sk_buff_head fip_recv_list;
Joe Eykholt794d98e2010-11-30 16:19:56 -0800138 struct sk_buff *flogi_req;
Joe Eykholte10f8c62010-07-20 15:20:30 -0700139
140 struct rnd_state rnd_state;
141 u32 port_id;
142
Joe Eykholt97c83892009-03-17 11:42:40 -0700143 u16 user_mfs;
144 u16 flogi_oxid;
Joe Eykholt794d98e2010-11-30 16:19:56 -0800145 u8 flogi_req_send;
Joe Eykholt97c83892009-03-17 11:42:40 -0700146 u8 flogi_count;
Joe Eykholt97c83892009-03-17 11:42:40 -0700147 u8 map_dest;
Vasu Dev184dd342009-05-17 12:33:28 +0000148 u8 spma;
Joe Eykholte10f8c62010-07-20 15:20:30 -0700149 u8 probe_tries;
Joe Eykholt97c83892009-03-17 11:42:40 -0700150 u8 dest_addr[ETH_ALEN];
151 u8 ctl_src_addr[ETH_ALEN];
Joe Eykholt97c83892009-03-17 11:42:40 -0700152
153 void (*send)(struct fcoe_ctlr *, struct sk_buff *);
Chris Leech11b56182009-11-03 11:46:29 -0800154 void (*update_mac)(struct fc_lport *, u8 *addr);
155 u8 * (*get_src_addr)(struct fc_lport *);
Joe Eykholtfdb068c2010-07-20 15:19:47 -0700156 struct mutex ctlr_mutex;
Joe Eykholt794d98e2010-11-30 16:19:56 -0800157 spinlock_t ctlr_lock;
Joe Eykholt97c83892009-03-17 11:42:40 -0700158};
159
Robert Love70b51aa2009-11-03 11:47:45 -0800160/**
161 * struct fcoe_fcf - Fibre-Channel Forwarder
162 * @list: list linkage
163 * @time: system time (jiffies) when an advertisement was last received
164 * @switch_name: WWN of switch from advertisement
165 * @fabric_name: WWN of fabric from advertisement
166 * @fc_map: FC_MAP value from advertisement
167 * @fcf_mac: Ethernet address of the FCF
168 * @vfid: virtual fabric ID
169 * @pri: selection priority, smaller values are better
Joe Eykholt794d98e2010-11-30 16:19:56 -0800170 * @flogi_sent: current FLOGI sent to this FCF
Robert Love70b51aa2009-11-03 11:47:45 -0800171 * @flags: flags received from advertisement
172 * @fka_period: keep-alive period, in jiffies
Joe Eykholt97c83892009-03-17 11:42:40 -0700173 *
174 * A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
175 * passes FCoE frames on to an FC fabric. This structure represents
176 * one FCF from which advertisements have been received.
177 *
178 * When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
179 * @fcf_mac together form the lookup key.
180 */
181struct fcoe_fcf {
182 struct list_head list;
183 unsigned long time;
184
185 u64 switch_name;
186 u64 fabric_name;
187 u32 fc_map;
188 u16 vfid;
189 u8 fcf_mac[ETH_ALEN];
190
191 u8 pri;
Joe Eykholt794d98e2010-11-30 16:19:56 -0800192 u8 flogi_sent;
Joe Eykholt97c83892009-03-17 11:42:40 -0700193 u16 flags;
194 u32 fka_period;
Yi Zou8cdffdc2009-11-20 14:54:57 -0800195 u8 fd_flags:1;
Joe Eykholt97c83892009-03-17 11:42:40 -0700196};
197
Joe Eykholte10f8c62010-07-20 15:20:30 -0700198/**
199 * struct fcoe_rport - VN2VN remote port
200 * @time: time of create or last beacon packet received from node
201 * @fcoe_len: max FCoE frame size, not including VLAN or Ethernet headers
202 * @flags: flags from probe or claim
203 * @login_count: number of unsuccessful rport logins to this port
204 * @enode_mac: E_Node control MAC address
205 * @vn_mac: VN_Node assigned MAC address for data
206 */
207struct fcoe_rport {
208 unsigned long time;
209 u16 fcoe_len;
210 u16 flags;
211 u8 login_count;
212 u8 enode_mac[ETH_ALEN];
213 u8 vn_mac[ETH_ALEN];
214};
215
Joe Eykholt97c83892009-03-17 11:42:40 -0700216/* FIP API functions */
Joe Eykholt3d902ac2010-07-20 15:19:58 -0700217void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_state);
Joe Eykholt97c83892009-03-17 11:42:40 -0700218void fcoe_ctlr_destroy(struct fcoe_ctlr *);
219void fcoe_ctlr_link_up(struct fcoe_ctlr *);
220int fcoe_ctlr_link_down(struct fcoe_ctlr *);
Chris Leech11b56182009-11-03 11:46:29 -0800221int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *);
Joe Eykholt97c83892009-03-17 11:42:40 -0700222void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
Robert Love70b51aa2009-11-03 11:47:45 -0800223int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *,
Joe Eykholt386309ce2009-11-03 11:49:16 -0800224 struct fc_frame *);
Joe Eykholt97c83892009-03-17 11:42:40 -0700225
Robert Love85b4aa42008-12-09 15:10:24 -0800226/* libfcoe funcs */
Vasu Devfdd78022009-03-17 11:42:24 -0700227u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
Joe Eykholte10f8c62010-07-20 15:20:30 -0700228int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *,
229 const struct libfc_function_template *, int init_fcp);
Bhanu Prakash Gollapudi8597ae82011-01-28 16:05:37 -0800230u32 fcoe_fc_crc(struct fc_frame *fp);
231int fcoe_start_io(struct sk_buff *skb);
Vasu Devfdd78022009-03-17 11:42:24 -0700232
Vasu Dev519e5132010-07-20 15:19:32 -0700233/**
234 * is_fip_mode() - returns true if FIP mode selected.
235 * @fip: FCoE controller.
236 */
237static inline bool is_fip_mode(struct fcoe_ctlr *fip)
238{
239 return fip->state == FIP_ST_ENABLED;
240}
241
Yi Zou0ade7d22011-01-28 16:04:50 -0800242/* helper for FCoE SW HBA drivers, can include subven and subdev if needed. The
243 * modpost would use pci_device_id table to auto-generate formatted module alias
244 * into the corresponding .mod.c file, but there may or may not be a pci device
245 * id table for FCoE drivers so we use the following helper for build the fcoe
246 * driver module alias.
247 */
248#define MODULE_ALIAS_FCOE_PCI(ven, dev) \
249 MODULE_ALIAS("fcoe-pci:" \
250 "v" __stringify(ven) \
251 "d" __stringify(dev) "sv*sd*bc*sc*i*")
252
253/* the name of the default FCoE transport driver fcoe.ko */
254#define FCOE_TRANSPORT_DEFAULT "fcoe"
255
256/* struct fcoe_transport - The FCoE transport interface
257 * @name: a vendor specific name for their FCoE transport driver
258 * @attached: whether this transport is already attached
259 * @list: list linkage to all attached transports
260 * @match: handler to allow the transport driver to match up a given netdev
261 * @create: handler to sysfs entry of create for FCoE instances
262 * @destroy: handler to sysfs entry of destroy for FCoE instances
263 * @enable: handler to sysfs entry of enable for FCoE instances
264 * @disable: handler to sysfs entry of disable for FCoE instances
265 */
266struct fcoe_transport {
267 char name[IFNAMSIZ];
268 bool attached;
269 struct list_head list;
270 bool (*match) (struct net_device *device);
271 int (*create) (struct net_device *device, enum fip_state fip_mode);
272 int (*destroy) (struct net_device *device);
273 int (*enable) (struct net_device *device);
274 int (*disable) (struct net_device *device);
275};
276
277/**
Bhanu Prakash Gollapudi8597ae82011-01-28 16:05:37 -0800278 * struct fcoe_percpu_s - The context for FCoE receive thread(s)
279 * @thread: The thread context
280 * @fcoe_rx_list: The queue of pending packets to process
281 * @page: The memory page for calculating frame trailer CRCs
282 * @crc_eof_offset: The offset into the CRC page pointing to available
283 * memory for a new trailer
284 */
285struct fcoe_percpu_s {
286 struct task_struct *thread;
287 struct sk_buff_head fcoe_rx_list;
288 struct page *crc_eof_page;
289 int crc_eof_offset;
290};
291
292/**
293 * struct fcoe_port - The FCoE private structure
294 * @priv: The associated fcoe interface. The structure is
295 * defined by the low level driver
296 * @lport: The associated local port
297 * @fcoe_pending_queue: The pending Rx queue of skbs
298 * @fcoe_pending_queue_active: Indicates if the pending queue is active
299 * @max_queue_depth: Max queue depth of pending queue
300 * @min_queue_depth: Min queue depth of pending queue
301 * @timer: The queue timer
302 * @destroy_work: Handle for work context
303 * (to prevent RTNL deadlocks)
304 * @data_srt_addr: Source address for data
305 *
306 * An instance of this structure is to be allocated along with the
307 * Scsi_Host and libfc fc_lport structures.
308 */
309struct fcoe_port {
310 void *priv;
311 struct fc_lport *lport;
312 struct sk_buff_head fcoe_pending_queue;
313 u8 fcoe_pending_queue_active;
314 u32 max_queue_depth;
315 u32 min_queue_depth;
316 struct timer_list timer;
317 struct work_struct destroy_work;
318 u8 data_src_addr[ETH_ALEN];
319};
320void fcoe_clean_pending_queue(struct fc_lport *);
321void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb);
322void fcoe_queue_timer(ulong lport);
323int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
324 struct fcoe_percpu_s *fps);
325
326/**
Yi Zou0ade7d22011-01-28 16:04:50 -0800327 * struct netdev_list
328 * A mapping from netdevice to fcoe_transport
329 */
330struct fcoe_netdev_mapping {
331 struct list_head list;
332 struct net_device *netdev;
333 struct fcoe_transport *ft;
334};
335
336/* fcoe transports registration and deregistration */
337int fcoe_transport_attach(struct fcoe_transport *ft);
338int fcoe_transport_detach(struct fcoe_transport *ft);
Vasu Dev519e5132010-07-20 15:19:32 -0700339
Robert Love85b4aa42008-12-09 15:10:24 -0800340#endif /* _LIBFCOE_H */