drivers/scsi/lpfc/lpfc_disc.h

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  *                                                                 *
   8  * This program is free software; you can redistribute it and/or   *
   9  * modify it under the terms of version 2 of the GNU General       *
  10  * Public License as published by the Free Software Foundation.    *
  11  * This program is distributed in the hope that it will be useful. *
  12  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  13  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  14  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  15  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  16  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  17  * more details, a copy of which can be found in the file COPYING  *
  18  * included with this package.                                     *
  19  *******************************************************************/
  20
  21 #define FC_MAX_HOLD_RSCN     32       /* max number of deferred RSCNs */
  22 #define FC_MAX_NS_RSP        65536    /* max size NameServer rsp */
  23 #define FC_MAXLOOP           126      /* max devices supported on a fc loop */
  24 #define LPFC_DISC_FLOGI_TMO  10       /* Discovery FLOGI ratov */
  25
  26
  27 /* This is the protocol dependent definition for a Node List Entry.
  28  * This is used by Fibre Channel protocol to support FCP.
  29  */
  30
  31 /* worker thread events */
  32 enum lpfc_work_type {
  33         LPFC_EVT_ONLINE,
  34         LPFC_EVT_OFFLINE_PREP,
  35         LPFC_EVT_OFFLINE,
  36         LPFC_EVT_WARM_START,
  37         LPFC_EVT_KILL,
  38         LPFC_EVT_ELS_RETRY,
  39 };
  40
  41 /* structure used to queue event to the discovery tasklet */
  42 struct lpfc_work_evt {
  43         struct list_head      evt_listp;
  44         void                * evt_arg1;
  45         void                * evt_arg2;
  46         enum lpfc_work_type   evt;
  47 };
  48
  49
  50 struct lpfc_nodelist {
  51         struct list_head nlp_listp;
  52         struct lpfc_name nlp_portname;          /* port name */
  53         struct lpfc_name nlp_nodename;          /* node name */
  54         uint32_t         nlp_flag;              /* entry  flags */
  55         uint32_t         nlp_DID;               /* FC D_ID of entry */
  56         uint32_t         nlp_last_elscmd;       /* Last ELS cmd sent */
  57         uint16_t         nlp_type;
  58 #define NLP_FC_NODE        0x1                  /* entry is an FC node */
  59 #define NLP_FABRIC         0x4                  /* entry rep a Fabric entity */
  60 #define NLP_FCP_TARGET     0x8                  /* entry is an FCP target */
  61 #define NLP_FCP_INITIATOR  0x10                 /* entry is an FCP Initiator */
  62
  63         uint16_t        nlp_rpi;
  64         uint16_t        nlp_state;              /* state transition indicator */
  65         uint16_t        nlp_prev_state;         /* state transition indicator */
  66         uint16_t        nlp_xri;                /* output exchange id for RPI */
  67         uint16_t        nlp_sid;                /* scsi id */
  68 #define NLP_NO_SID              0xffff
  69         uint16_t        nlp_maxframe;           /* Max RCV frame size */
  70         uint8_t         nlp_class_sup;          /* Supported Classes */
  71         uint8_t         nlp_retry;              /* used for ELS retries */
  72         uint8_t         nlp_fcp_info;           /* class info, bits 0-3 */
  73 #define NLP_FCP_2_DEVICE   0x10                 /* FCP-2 device */
  74
  75         struct timer_list   nlp_delayfunc;      /* Used for delayed ELS cmds */
  76         struct fc_rport *rport;                 /* Corresponding FC transport
  77                                                    port structure */
  78         struct lpfc_hba      *nlp_phba;
  79         struct lpfc_work_evt els_retry_evt;
  80         unsigned long last_ramp_up_time;        /* jiffy of last ramp up */
  81         unsigned long last_q_full_time;         /* jiffy of last queue full */
  82         struct kref     kref;
  83 };
  84
  85 /* Defines for nlp_flag (uint32) */
  86 #define NLP_PLOGI_SND      0x20         /* sent PLOGI request for this entry */
  87 #define NLP_PRLI_SND       0x40         /* sent PRLI request for this entry */
  88 #define NLP_ADISC_SND      0x80         /* sent ADISC request for this entry */
  89 #define NLP_LOGO_SND       0x100        /* sent LOGO request for this entry */
  90 #define NLP_RNID_SND       0x400        /* sent RNID request for this entry */
  91 #define NLP_ELS_SND_MASK   0x7e0        /* sent ELS request for this entry */
  92 #define NLP_DELAY_TMO      0x20000      /* delay timeout is running for node */
  93 #define NLP_NPR_2B_DISC    0x40000      /* node is included in num_disc_nodes */
  94 #define NLP_RCV_PLOGI      0x80000      /* Rcv'ed PLOGI from remote system */
  95 #define NLP_LOGO_ACC       0x100000     /* Process LOGO after ACC completes */
  96 #define NLP_TGT_NO_SCSIID  0x200000     /* good PRLI but no binding for scsid */
  97 #define NLP_ACC_REGLOGIN   0x1000000    /* Issue Reg Login after successful
  98                                            ACC */
  99 #define NLP_NPR_ADISC      0x2000000    /* Issue ADISC when dq'ed from
 100                                            NPR list */
 101 #define NLP_NODEV_REMOVE   0x8000000    /* Defer removal till discovery ends */
 102
 103 /* There are 4 different double linked lists nodelist entries can reside on.
 104  * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
 105  * when Link Up discovery or Registered State Change Notification (RSCN)
 106  * processing is needed.  Each list holds the nodes that require a PLOGI or
 107  * ADISC Extended Link Service (ELS) request.  These lists keep track of the
 108  * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
 109  * by Link Up) event.  The unmapped_list contains all nodes that have
 110  * successfully logged into at the Fibre Channel level.  The
 111  * mapped_list will contain all nodes that are mapped FCP targets.
 112  *
 113  * The bind list is a list of undiscovered (potentially non-existent) nodes
 114  * that we have saved binding information on. This information is used when
 115  * nodes transition from the unmapped to the mapped list.
 116  */
 117
 118 /* Defines for nlp_state */
 119 #define NLP_STE_UNUSED_NODE       0x0   /* node is just allocated */
 120 #define NLP_STE_PLOGI_ISSUE       0x1   /* PLOGI was sent to NL_PORT */
 121 #define NLP_STE_ADISC_ISSUE       0x2   /* ADISC was sent to NL_PORT */
 122 #define NLP_STE_REG_LOGIN_ISSUE   0x3   /* REG_LOGIN was issued for NL_PORT */
 123 #define NLP_STE_PRLI_ISSUE        0x4   /* PRLI was sent to NL_PORT */
 124 #define NLP_STE_UNMAPPED_NODE     0x5   /* PRLI completed from NL_PORT */
 125 #define NLP_STE_MAPPED_NODE       0x6   /* Identified as a FCP Target */
 126 #define NLP_STE_NPR_NODE          0x7   /* NPort disappeared */
 127 #define NLP_STE_MAX_STATE         0x8
 128 #define NLP_STE_FREED_NODE        0xff  /* node entry was freed to MEM_NLP */
 129
 130 /* For UNUSED_NODE state, the node has just been allocated.
 131  * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
 132  * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
 133  * and put on the unmapped list. For ADISC processing, the node is taken off
 134  * the ADISC list and placed on either the mapped or unmapped list (depending
 135  * on its previous state). Once on the unmapped list, a PRLI is issued and the
 136  * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
 137  * changed to PRLI_COMPL. If the completion indicates a mapped
 138  * node, the node is taken off the unmapped list. The binding list is checked
 139  * for a valid binding, or a binding is automatically assigned. If binding
 140  * assignment is unsuccessful, the node is left on the unmapped list. If
 141  * binding assignment is successful, the associated binding list entry (if
 142  * any) is removed, and the node is placed on the mapped list.
 143  */
 144 /*
 145  * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
 146  * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
 147  * expire, all effected nodes will receive a DEVICE_RM event.
 148  */
 149 /*
 150  * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
 151  * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
 152  * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
 153  * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
 154  * we will first process the ADISC list.  32 entries are processed initially and
 155  * ADISC is initited for each one.  Completions / Events for each node are
 156  * funnelled thru the state machine.  As each node finishes ADISC processing, it
 157  * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
 158  * waiting, and the ADISC list count is identically 0, then we are done. For
 159  * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
 160  * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
 161  * list.  32 entries are processed initially and PLOGI is initited for each one.
 162  * Completions / Events for each node are funnelled thru the state machine.  As
 163  * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
 164  * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
 165  * identically 0, then we are done. We have now completed discovery / RSCN
 166  * handling. Upon completion, ALL nodes should be on either the mapped or
 167  * unmapped lists.
 168  */
 169
 170 /* Defines for Node List Entry Events that could happen */
 171 #define NLP_EVT_RCV_PLOGI         0x0   /* Rcv'd an ELS PLOGI command */
 172 #define NLP_EVT_RCV_PRLI          0x1   /* Rcv'd an ELS PRLI  command */
 173 #define NLP_EVT_RCV_LOGO          0x2   /* Rcv'd an ELS LOGO  command */
 174 #define NLP_EVT_RCV_ADISC         0x3   /* Rcv'd an ELS ADISC command */
 175 #define NLP_EVT_RCV_PDISC         0x4   /* Rcv'd an ELS PDISC command */
 176 #define NLP_EVT_RCV_PRLO          0x5   /* Rcv'd an ELS PRLO  command */
 177 #define NLP_EVT_CMPL_PLOGI        0x6   /* Sent an ELS PLOGI command */
 178 #define NLP_EVT_CMPL_PRLI         0x7   /* Sent an ELS PRLI  command */
 179 #define NLP_EVT_CMPL_LOGO         0x8   /* Sent an ELS LOGO  command */
 180 #define NLP_EVT_CMPL_ADISC        0x9   /* Sent an ELS ADISC command */
 181 #define NLP_EVT_CMPL_REG_LOGIN    0xa   /* REG_LOGIN mbox cmd completed */
 182 #define NLP_EVT_DEVICE_RM         0xb   /* Device not found in NS / ALPAmap */
 183 #define NLP_EVT_DEVICE_RECOVERY   0xc   /* Device existence unknown */
 184 #define NLP_EVT_MAX_EVENT         0xd
 185