include/scsi/libfcoe.h

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