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  * FIP tunable parameters.
  37  */
  38 #define FCOE_CTLR_START_DELAY   2000    /* mS after first adv. to choose FCF */
  39 #define FCOE_CTRL_SOL_TOV       2000    /* min. solicitation interval (mS) */
  40 #define FCOE_CTLR_FCF_LIMIT     20      /* max. number of FCF entries */
  41 #define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3   /* max. VN2VN rport login retries */
  42
  43 /**
  44  * enum fip_state - internal state of FCoE controller.
  45  * @FIP_ST_DISABLED:    controller has been disabled or not yet enabled.
  46  * @FIP_ST_LINK_WAIT:   the physical link is down or unusable.
  47  * @FIP_ST_AUTO:        determining whether to use FIP or non-FIP mode.
  48  * @FIP_ST_NON_FIP:     non-FIP mode selected.
  49  * @FIP_ST_ENABLED:     FIP mode selected.
  50  * @FIP_ST_VNMP_START:  VN2VN multipath mode start, wait
  51  * @FIP_ST_VNMP_PROBE1: VN2VN sent first probe, listening
  52  * @FIP_ST_VNMP_PROBE2: VN2VN sent second probe, listening
  53  * @FIP_ST_VNMP_CLAIM:  VN2VN sent claim, waiting for responses
  54  * @FIP_ST_VNMP_UP:     VN2VN multipath mode operation
  55  */
  56 enum fip_state {
  57         FIP_ST_DISABLED,
  58         FIP_ST_LINK_WAIT,
  59         FIP_ST_AUTO,
  60         FIP_ST_NON_FIP,
  61         FIP_ST_ENABLED,
  62         FIP_ST_VNMP_START,
  63         FIP_ST_VNMP_PROBE1,
  64         FIP_ST_VNMP_PROBE2,
  65         FIP_ST_VNMP_CLAIM,
  66         FIP_ST_VNMP_UP,
  67 };
  68
  69 /*
  70  * Modes:
  71  * The mode is the state that is to be entered after link up.
  72  * It must not change after fcoe_ctlr_init() sets it.
  73  */
  74 #define FIP_MODE_AUTO           FIP_ST_AUTO
  75 #define FIP_MODE_NON_FIP        FIP_ST_NON_FIP
  76 #define FIP_MODE_FABRIC         FIP_ST_ENABLED
  77 #define FIP_MODE_VN2VN          FIP_ST_VNMP_START
  78
  79 /**
  80  * struct fcoe_ctlr - FCoE Controller and FIP state
  81  * @state:         internal FIP state for network link and FIP or non-FIP mode.
  82  * @mode:          LLD-selected mode.
  83  * @lp:            &fc_lport: libfc local port.
  84  * @sel_fcf:       currently selected FCF, or NULL.
  85  * @fcfs:          list of discovered FCFs.
  86  * @fcf_count:     number of discovered FCF entries.
  87  * @sol_time:      time when a multicast solicitation was last sent.
  88  * @sel_time:      time after which to select an FCF.
  89  * @port_ka_time:  time of next port keep-alive.
  90  * @ctlr_ka_time:  time of next controller keep-alive.
  91  * @timer:         timer struct used for all delayed events.
  92  * @timer_work:    &work_struct for doing keep-alives and resets.
  93  * @recv_work:     &work_struct for receiving FIP frames.
  94  * @fip_recv_list: list of received FIP frames.
  95  * @flogi_req:     clone of FLOGI request sent
  96  * @rnd_state:     state for pseudo-random number generator.
  97  * @port_id:       proposed or selected local-port ID.
  98  * @user_mfs:      configured maximum FC frame size, including FC header.
  99  * @flogi_oxid:    exchange ID of most recent fabric login.
 100  * @flogi_req_send: send of FLOGI requested
 101  * @flogi_count:   number of FLOGI attempts in AUTO mode.
 102  * @map_dest:      use the FC_MAP mode for destination MAC addresses.
 103  * @spma:          supports SPMA server-provided MACs mode
 104  * @probe_tries:   number of FC_IDs probed
 105  * @dest_addr:     MAC address of the selected FC forwarder.
 106  * @ctl_src_addr:  the native MAC address of our local port.
 107  * @send:          LLD-supplied function to handle sending FIP Ethernet frames
 108  * @update_mac:    LLD-supplied function to handle changes to MAC addresses.
 109  * @get_src_addr:  LLD-supplied function to supply a source MAC address.
 110  * @ctlr_mutex:    lock protecting this structure.
 111  * @ctlr_lock:     spinlock covering flogi_req
 112  *
 113  * This structure is used by all FCoE drivers.  It contains information
 114  * needed by all FCoE low-level drivers (LLDs) as well as internal state
 115  * for FIP, and fields shared with the LLDS.
 116  */
 117 struct fcoe_ctlr {
 118         enum fip_state state;
 119         enum fip_state mode;
 120         struct fc_lport *lp;
 121         struct fcoe_fcf *sel_fcf;
 122         struct list_head fcfs;
 123         u16 fcf_count;
 124         unsigned long sol_time;
 125         unsigned long sel_time;
 126         unsigned long port_ka_time;
 127         unsigned long ctlr_ka_time;
 128         struct timer_list timer;
 129         struct work_struct timer_work;
 130         struct work_struct recv_work;
 131         struct sk_buff_head fip_recv_list;
 132         struct sk_buff *flogi_req;
 133
 134         struct rnd_state rnd_state;
 135         u32 port_id;
 136
 137         u16 user_mfs;
 138         u16 flogi_oxid;
 139         u8 flogi_req_send;
 140         u8 flogi_count;
 141         u8 map_dest;
 142         u8 spma;
 143         u8 probe_tries;
 144         u8 dest_addr[ETH_ALEN];
 145         u8 ctl_src_addr[ETH_ALEN];
 146
 147         void (*send)(struct fcoe_ctlr *, struct sk_buff *);
 148         void (*update_mac)(struct fc_lport *, u8 *addr);
 149         u8 * (*get_src_addr)(struct fc_lport *);
 150         struct mutex ctlr_mutex;
 151         spinlock_t ctlr_lock;
 152 };
 153
 154 /**
 155  * struct fcoe_fcf - Fibre-Channel Forwarder
 156  * @list:        list linkage
 157  * @time:        system time (jiffies) when an advertisement was last received
 158  * @switch_name: WWN of switch from advertisement
 159  * @fabric_name: WWN of fabric from advertisement
 160  * @fc_map:      FC_MAP value from advertisement
 161  * @fcf_mac:     Ethernet address of the FCF
 162  * @vfid:        virtual fabric ID
 163  * @pri:         selection priority, smaller values are better
 164  * @flogi_sent:  current FLOGI sent to this FCF
 165  * @flags:       flags received from advertisement
 166  * @fka_period:  keep-alive period, in jiffies
 167  *
 168  * A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
 169  * passes FCoE frames on to an FC fabric.  This structure represents
 170  * one FCF from which advertisements have been received.
 171  *
 172  * When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
 173  * @fcf_mac together form the lookup key.
 174  */
 175 struct fcoe_fcf {
 176         struct list_head list;
 177         unsigned long time;
 178
 179         u64 switch_name;
 180         u64 fabric_name;
 181         u32 fc_map;
 182         u16 vfid;
 183         u8 fcf_mac[ETH_ALEN];
 184
 185         u8 pri;
 186         u8 flogi_sent;
 187         u16 flags;
 188         u32 fka_period;
 189         u8 fd_flags:1;
 190 };
 191
 192 /**
 193  * struct fcoe_rport - VN2VN remote port
 194  * @time:       time of create or last beacon packet received from node
 195  * @fcoe_len:   max FCoE frame size, not including VLAN or Ethernet headers
 196  * @flags:      flags from probe or claim
 197  * @login_count: number of unsuccessful rport logins to this port
 198  * @enode_mac:  E_Node control MAC address
 199  * @vn_mac:     VN_Node assigned MAC address for data
 200  */
 201 struct fcoe_rport {
 202         unsigned long time;
 203         u16 fcoe_len;
 204         u16 flags;
 205         u8 login_count;
 206         u8 enode_mac[ETH_ALEN];
 207         u8 vn_mac[ETH_ALEN];
 208 };
 209
 210 /* FIP API functions */
 211 void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_state);
 212 void fcoe_ctlr_destroy(struct fcoe_ctlr *);
 213 void fcoe_ctlr_link_up(struct fcoe_ctlr *);
 214 int fcoe_ctlr_link_down(struct fcoe_ctlr *);
 215 int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *);
 216 void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
 217 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *,
 218                          struct fc_frame *);
 219
 220 /* libfcoe funcs */
 221 u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
 222 int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *,
 223                       const struct libfc_function_template *, int init_fcp);
 224
 225 /**
 226  * is_fip_mode() - returns true if FIP mode selected.
 227  * @fip:        FCoE controller.
 228  */
 229 static inline bool is_fip_mode(struct fcoe_ctlr *fip)
 230 {
 231         return fip->state == FIP_ST_ENABLED;
 232 }
 233
 234
 235 #endif /* _LIBFCOE_H */