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
  33 #define FCOE_MAX_CMD_LEN        16      /* Supported CDB length */
  34
  35 /*
  36  * 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 /*
  42  * 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 */
  47 #define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3   /* max. VN2VN rport login retries */
  48
  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.
  56  * @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
  61  */
  62 enum fip_state {
  63         FIP_ST_DISABLED,
  64         FIP_ST_LINK_WAIT,
  65         FIP_ST_AUTO,
  66         FIP_ST_NON_FIP,
  67         FIP_ST_ENABLED,
  68         FIP_ST_VNMP_START,
  69         FIP_ST_VNMP_PROBE1,
  70         FIP_ST_VNMP_PROBE2,
  71         FIP_ST_VNMP_CLAIM,
  72         FIP_ST_VNMP_UP,
  73 };
  74
  75 /*
  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
  83 #define FIP_MODE_VN2VN          FIP_ST_VNMP_START
  84
  85 /**
  86  * struct fcoe_ctlr - FCoE Controller and FIP state
  87  * @state:         internal FIP state for network link and FIP or non-FIP mode.
  88  * @mode:          LLD-selected mode.
  89  * @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.
  98  * @timer_work:    &work_struct for doing keep-alives and resets.
  99  * @recv_work:     &work_struct for receiving FIP frames.
 100  * @fip_recv_list: list of received FIP frames.
 101  * @flogi_req:     clone of FLOGI request sent
 102  * @rnd_state:     state for pseudo-random number generator.
 103  * @port_id:       proposed or selected local-port ID.
 104  * @user_mfs:      configured maximum FC frame size, including FC header.
 105  * @flogi_oxid:    exchange ID of most recent fabric login.
 106  * @flogi_req_send: send of FLOGI requested
 107  * @flogi_count:   number of FLOGI attempts in AUTO mode.
 108  * @map_dest:      use the FC_MAP mode for destination MAC addresses.
 109  * @spma:          supports SPMA server-provided MACs mode
 110  * @probe_tries:   number of FC_IDs probed
 111  * @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.
 116  * @ctlr_mutex:    lock protecting this structure.
 117  * @ctlr_lock:     spinlock covering flogi_req
 118  *
 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  */
 123 struct fcoe_ctlr {
 124         enum fip_state state;
 125         enum fip_state mode;
 126         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;
 135         struct work_struct timer_work;
 136         struct work_struct recv_work;
 137         struct sk_buff_head fip_recv_list;
 138         struct sk_buff *flogi_req;
 139
 140         struct rnd_state rnd_state;
 141         u32 port_id;
 142
 143         u16 user_mfs;
 144         u16 flogi_oxid;
 145         u8 flogi_req_send;
 146         u8 flogi_count;
 147         u8 map_dest;
 148         u8 spma;
 149         u8 probe_tries;
 150         u8 dest_addr[ETH_ALEN];
 151         u8 ctl_src_addr[ETH_ALEN];
 152
 153         void (*send)(struct fcoe_ctlr *, struct sk_buff *);
 154         void (*update_mac)(struct fc_lport *, u8 *addr);
 155         u8 * (*get_src_addr)(struct fc_lport *);
 156         struct mutex ctlr_mutex;
 157         spinlock_t ctlr_lock;
 158 };
 159
 160 /**
 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
 170  * @flogi_sent:  current FLOGI sent to this FCF
 171  * @flags:       flags received from advertisement
 172  * @fka_period:  keep-alive period, in jiffies
 173  *
 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  */
 181 struct 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;
 192         u8 flogi_sent;
 193         u16 flags;
 194         u32 fka_period;
 195         u8 fd_flags:1;
 196 };
 197
 198 /**
 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  */
 207 struct 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
 216 /* FIP API functions */
 217 void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_state);
 218 void fcoe_ctlr_destroy(struct fcoe_ctlr *);
 219 void fcoe_ctlr_link_up(struct fcoe_ctlr *);
 220 int fcoe_ctlr_link_down(struct fcoe_ctlr *);
 221 int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *);
 222 void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
 223 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *,
 224                          struct fc_frame *);
 225
 226 /* libfcoe funcs */
 227 u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
 228 int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *,
 229                       const struct libfc_function_template *, int init_fcp);
 230 u32 fcoe_fc_crc(struct fc_frame *fp);
 231 int fcoe_start_io(struct sk_buff *skb);
 232
 233 /**
 234  * is_fip_mode() - returns true if FIP mode selected.
 235  * @fip:        FCoE controller.
 236  */
 237 static inline bool is_fip_mode(struct fcoe_ctlr *fip)
 238 {
 239         return fip->state == FIP_ST_ENABLED;
 240 }
 241
 242 /* 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  */
 266 struct 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 /**
 278  * 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  */
 285 struct 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  */
 309 struct 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 };
 320 void fcoe_clean_pending_queue(struct fc_lport *);
 321 void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb);
 322 void fcoe_queue_timer(ulong lport);
 323 int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
 324                            struct fcoe_percpu_s *fps);
 325
 326 /**
 327  * struct netdev_list
 328  * A mapping from netdevice to fcoe_transport
 329  */
 330 struct 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 */
 337 int fcoe_transport_attach(struct fcoe_transport *ft);
 338 int fcoe_transport_detach(struct fcoe_transport *ft);
 339
 340 #endif /* _LIBFCOE_H */