release/src-rt-6.x.4708/linux/linux-2.6.36/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) 2004-2008 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        64512    /* 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         LPFC_EVT_DEV_LOSS,
  40         LPFC_EVT_FASTPATH_MGMT_EVT,
  41         LPFC_EVT_RESET_HBA,
  42 };
  43
  44 /* structure used to queue event to the discovery tasklet */
  45 struct lpfc_work_evt {
  46         struct list_head      evt_listp;
  47         void                 *evt_arg1;
  48         void                 *evt_arg2;
  49         enum lpfc_work_type   evt;
  50 };
  51
  52 struct lpfc_scsi_check_condition_event;
  53 struct lpfc_scsi_varqueuedepth_event;
  54 struct lpfc_scsi_event_header;
  55 struct lpfc_fabric_event_header;
  56 struct lpfc_fcprdchkerr_event;
  57
  58 /* structure used for sending events from fast path */
  59 struct lpfc_fast_path_event {
  60         struct lpfc_work_evt work_evt;
  61         struct lpfc_vport     *vport;
  62         union {
  63                 struct lpfc_scsi_check_condition_event check_cond_evt;
  64                 struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
  65                 struct lpfc_scsi_event_header scsi_evt;
  66                 struct lpfc_fabric_event_header fabric_evt;
  67                 struct lpfc_fcprdchkerr_event read_check_error;
  68         } un;
  69 };
  70
  71 struct lpfc_nodelist {
  72         struct list_head nlp_listp;
  73         struct lpfc_name nlp_portname;
  74         struct lpfc_name nlp_nodename;
  75         uint32_t         nlp_flag;              /* entry  flags */
  76         uint32_t         nlp_DID;               /* FC D_ID of entry */
  77         uint32_t         nlp_last_elscmd;       /* Last ELS cmd sent */
  78         uint16_t         nlp_type;
  79 #define NLP_FC_NODE        0x1                  /* entry is an FC node */
  80 #define NLP_FABRIC         0x4                  /* entry rep a Fabric entity */
  81 #define NLP_FCP_TARGET     0x8                  /* entry is an FCP target */
  82 #define NLP_FCP_INITIATOR  0x10                 /* entry is an FCP Initiator */
  83
  84         uint16_t        nlp_rpi;
  85         uint16_t        nlp_state;              /* state transition indicator */
  86         uint16_t        nlp_prev_state;         /* state transition indicator */
  87         uint16_t        nlp_xri;                /* output exchange id for RPI */
  88         uint16_t        nlp_sid;                /* scsi id */
  89 #define NLP_NO_SID              0xffff
  90         uint16_t        nlp_maxframe;           /* Max RCV frame size */
  91         uint8_t         nlp_class_sup;          /* Supported Classes */
  92         uint8_t         nlp_retry;              /* used for ELS retries */
  93         uint8_t         nlp_fcp_info;           /* class info, bits 0-3 */
  94 #define NLP_FCP_2_DEVICE   0x10                 /* FCP-2 device */
  95
  96         uint16_t        nlp_usg_map;    /* ndlp management usage bitmap */
  97 #define NLP_USG_NODE_ACT_BIT    0x1     /* Indicate ndlp is actively used */
  98 #define NLP_USG_IACT_REQ_BIT    0x2     /* Request to inactivate ndlp */
  99 #define NLP_USG_FREE_REQ_BIT    0x4     /* Request to invoke ndlp memory free */
 100 #define NLP_USG_FREE_ACK_BIT    0x8     /* Indicate ndlp memory free invoked */
 101
 102         struct timer_list   nlp_delayfunc;      /* Used for delayed ELS cmds */
 103         struct lpfc_hba *phba;
 104         struct fc_rport *rport;                 /* Corresponding FC transport
 105                                                    port structure */
 106         struct lpfc_vport *vport;
 107         struct lpfc_work_evt els_retry_evt;
 108         struct lpfc_work_evt dev_loss_evt;
 109         struct kref     kref;
 110         atomic_t cmd_pending;
 111         uint32_t cmd_qdepth;
 112         unsigned long last_change_time;
 113         struct lpfc_scsicmd_bkt *lat_data;      /* Latency data */
 114 };
 115
 116 /* Defines for nlp_flag (uint32) */
 117 #define NLP_IGNR_REG_CMPL  0x00000001 /* Rcvd rscn before we cmpl reg login */
 118 #define NLP_REG_LOGIN_SEND 0x00000002   /* sent reglogin to adapter */
 119 #define NLP_PLOGI_SND      0x00000020   /* sent PLOGI request for this entry */
 120 #define NLP_PRLI_SND       0x00000040   /* sent PRLI request for this entry */
 121 #define NLP_ADISC_SND      0x00000080   /* sent ADISC request for this entry */
 122 #define NLP_LOGO_SND       0x00000100   /* sent LOGO request for this entry */
 123 #define NLP_RNID_SND       0x00000400   /* sent RNID request for this entry */
 124 #define NLP_ELS_SND_MASK   0x000007e0   /* sent ELS request for this entry */
 125 #define NLP_DEFER_RM       0x00010000   /* Remove this ndlp if no longer used */
 126 #define NLP_DELAY_TMO      0x00020000   /* delay timeout is running for node */
 127 #define NLP_NPR_2B_DISC    0x00040000   /* node is included in num_disc_nodes */
 128 #define NLP_RCV_PLOGI      0x00080000   /* Rcv'ed PLOGI from remote system */
 129 #define NLP_LOGO_ACC       0x00100000   /* Process LOGO after ACC completes */
 130 #define NLP_TGT_NO_SCSIID  0x00200000   /* good PRLI but no binding for scsid */
 131 #define NLP_ACC_REGLOGIN   0x01000000   /* Issue Reg Login after successful
 132                                            ACC */
 133 #define NLP_NPR_ADISC      0x02000000   /* Issue ADISC when dq'ed from
 134                                            NPR list */
 135 #define NLP_RM_DFLT_RPI    0x04000000   /* need to remove leftover dflt RPI */
 136 #define NLP_NODEV_REMOVE   0x08000000   /* Defer removal till discovery ends */
 137 #define NLP_TARGET_REMOVE  0x10000000   /* Target remove in process */
 138 #define NLP_SC_REQ         0x20000000   /* Target requires authentication */
 139 #define NLP_RPI_VALID      0x80000000   /* nlp_rpi is valid */
 140
 141 /* ndlp usage management macros */
 142 #define NLP_CHK_NODE_ACT(ndlp)          (((ndlp)->nlp_usg_map \
 143                                                 & NLP_USG_NODE_ACT_BIT) \
 144                                         && \
 145                                         !((ndlp)->nlp_usg_map \
 146                                                 & NLP_USG_FREE_ACK_BIT))
 147 #define NLP_SET_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
 148                                                 |= NLP_USG_NODE_ACT_BIT)
 149 #define NLP_INT_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
 150                                                 = NLP_USG_NODE_ACT_BIT)
 151 #define NLP_CLR_NODE_ACT(ndlp)          ((ndlp)->nlp_usg_map \
 152                                                 &= ~NLP_USG_NODE_ACT_BIT)
 153 #define NLP_CHK_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
 154                                                 & NLP_USG_IACT_REQ_BIT)
 155 #define NLP_SET_IACT_REQ(ndlp)          ((ndlp)->nlp_usg_map \
 156                                                 |= NLP_USG_IACT_REQ_BIT)
 157 #define NLP_CHK_FREE_REQ(ndlp)          ((ndlp)->nlp_usg_map \
 158                                                 & NLP_USG_FREE_REQ_BIT)
 159 #define NLP_SET_FREE_REQ(ndlp)          ((ndlp)->nlp_usg_map \
 160                                                 |= NLP_USG_FREE_REQ_BIT)
 161 #define NLP_CHK_FREE_ACK(ndlp)          ((ndlp)->nlp_usg_map \
 162                                                 & NLP_USG_FREE_ACK_BIT)
 163 #define NLP_SET_FREE_ACK(ndlp)          ((ndlp)->nlp_usg_map \
 164                                                 |= NLP_USG_FREE_ACK_BIT)
 165
 166 /* There are 4 different double linked lists nodelist entries can reside on.
 167  * The Port Login (PLOGI) list and Address Discovery (ADISC) list are used
 168  * when Link Up discovery or Registered State Change Notification (RSCN)
 169  * processing is needed.  Each list holds the nodes that require a PLOGI or
 170  * ADISC Extended Link Service (ELS) request.  These lists keep track of the
 171  * nodes affected by an RSCN, or a Link Up (Typically, all nodes are effected
 172  * by Link Up) event.  The unmapped_list contains all nodes that have
 173  * successfully logged into at the Fibre Channel level.  The
 174  * mapped_list will contain all nodes that are mapped FCP targets.
 175  *
 176  * The bind list is a list of undiscovered (potentially non-existent) nodes
 177  * that we have saved binding information on. This information is used when
 178  * nodes transition from the unmapped to the mapped list.
 179  */
 180
 181 /* Defines for nlp_state */
 182 #define NLP_STE_UNUSED_NODE       0x0   /* node is just allocated */
 183 #define NLP_STE_PLOGI_ISSUE       0x1   /* PLOGI was sent to NL_PORT */
 184 #define NLP_STE_ADISC_ISSUE       0x2   /* ADISC was sent to NL_PORT */
 185 #define NLP_STE_REG_LOGIN_ISSUE   0x3   /* REG_LOGIN was issued for NL_PORT */
 186 #define NLP_STE_PRLI_ISSUE        0x4   /* PRLI was sent to NL_PORT */
 187 #define NLP_STE_UNMAPPED_NODE     0x5   /* PRLI completed from NL_PORT */
 188 #define NLP_STE_MAPPED_NODE       0x6   /* Identified as a FCP Target */
 189 #define NLP_STE_NPR_NODE          0x7   /* NPort disappeared */
 190 #define NLP_STE_MAX_STATE         0x8
 191 #define NLP_STE_FREED_NODE        0xff  /* node entry was freed to MEM_NLP */
 192
 193 /* For UNUSED_NODE state, the node has just been allocated.
 194  * For PLOGI_ISSUE and REG_LOGIN_ISSUE, the node is on
 195  * the PLOGI list. For REG_LOGIN_COMPL, the node is taken off the PLOGI list
 196  * and put on the unmapped list. For ADISC processing, the node is taken off
 197  * the ADISC list and placed on either the mapped or unmapped list (depending
 198  * on its previous state). Once on the unmapped list, a PRLI is issued and the
 199  * state changed to PRLI_ISSUE. When the PRLI completion occurs, the state is
 200  * changed to PRLI_COMPL. If the completion indicates a mapped
 201  * node, the node is taken off the unmapped list. The binding list is checked
 202  * for a valid binding, or a binding is automatically assigned. If binding
 203  * assignment is unsuccessful, the node is left on the unmapped list. If
 204  * binding assignment is successful, the associated binding list entry (if
 205  * any) is removed, and the node is placed on the mapped list.
 206  */
 207 /*
 208  * For a Link Down, all nodes on the ADISC, PLOGI, unmapped or mapped
 209  * lists will receive a DEVICE_RECOVERY event. If the linkdown or devloss timers
 210  * expire, all effected nodes will receive a DEVICE_RM event.
 211  */
 212 /*
 213  * For a Link Up or RSCN, all nodes will move from the mapped / unmapped lists
 214  * to either the ADISC or PLOGI list.  After a Nameserver query or ALPA loopmap
 215  * check, additional nodes may be added (DEVICE_ADD) or removed (DEVICE_RM) to /
 216  * from the PLOGI or ADISC lists. Once the PLOGI and ADISC lists are populated,
 217  * we will first process the ADISC list.  32 entries are processed initially and
 218  * ADISC is initited for each one.  Completions / Events for each node are
 219  * funnelled thru the state machine.  As each node finishes ADISC processing, it
 220  * starts ADISC for any nodes waiting for ADISC processing. If no nodes are
 221  * waiting, and the ADISC list count is identically 0, then we are done. For
 222  * Link Up discovery, since all nodes on the PLOGI list are UNREG_LOGIN'ed, we
 223  * can issue a CLEAR_LA and reenable Link Events. Next we will process the PLOGI
 224  * list.  32 entries are processed initially and PLOGI is initited for each one.
 225  * Completions / Events for each node are funnelled thru the state machine.  As
 226  * each node finishes PLOGI processing, it starts PLOGI for any nodes waiting
 227  * for PLOGI processing. If no nodes are waiting, and the PLOGI list count is
 228  * identically 0, then we are done. We have now completed discovery / RSCN
 229  * handling. Upon completion, ALL nodes should be on either the mapped or
 230  * unmapped lists.
 231  */
 232
 233 /* Defines for Node List Entry Events that could happen */
 234 #define NLP_EVT_RCV_PLOGI         0x0   /* Rcv'd an ELS PLOGI command */
 235 #define NLP_EVT_RCV_PRLI          0x1   /* Rcv'd an ELS PRLI  command */
 236 #define NLP_EVT_RCV_LOGO          0x2   /* Rcv'd an ELS LOGO  command */
 237 #define NLP_EVT_RCV_ADISC         0x3   /* Rcv'd an ELS ADISC command */
 238 #define NLP_EVT_RCV_PDISC         0x4   /* Rcv'd an ELS PDISC command */
 239 #define NLP_EVT_RCV_PRLO          0x5   /* Rcv'd an ELS PRLO  command */
 240 #define NLP_EVT_CMPL_PLOGI        0x6   /* Sent an ELS PLOGI command */
 241 #define NLP_EVT_CMPL_PRLI         0x7   /* Sent an ELS PRLI  command */
 242 #define NLP_EVT_CMPL_LOGO         0x8   /* Sent an ELS LOGO  command */
 243 #define NLP_EVT_CMPL_ADISC        0x9   /* Sent an ELS ADISC command */
 244 #define NLP_EVT_CMPL_REG_LOGIN    0xa   /* REG_LOGIN mbox cmd completed */
 245 #define NLP_EVT_DEVICE_RM         0xb   /* Device not found in NS / ALPAmap */
 246 #define NLP_EVT_DEVICE_RECOVERY   0xc   /* Device existence unknown */
 247 #define NLP_EVT_MAX_EVENT         0xd