drivers/scsi/bfa/n2n.c

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 /**
  19  *  n2n.c n2n implementation.
  20  */
  21 #include <bfa.h>
  22 #include <bfa_svc.h>
  23 #include "fcs_lport.h"
  24 #include "fcs_rport.h"
  25 #include "fcs_trcmod.h"
  26 #include "lport_priv.h"
  27
  28 BFA_TRC_FILE(FCS, N2N);
  29
  30 /**
  31  *   Called by fcs/port to initialize N2N topology.
  32  */
  33 void
  34 bfa_fcs_port_n2n_init(struct bfa_fcs_port_s *port)
  35 {
  36 }
  37
  38 /**
  39  *   Called by fcs/port to notify transition to online state.
  40  */
  41 void
  42 bfa_fcs_port_n2n_online(struct bfa_fcs_port_s *port)
  43 {
  44         struct bfa_fcs_port_n2n_s *n2n_port = &port->port_topo.pn2n;
  45         struct bfa_port_cfg_s *pcfg = &port->port_cfg;
  46         struct bfa_fcs_rport_s *rport;
  47
  48         bfa_trc(port->fcs, pcfg->pwwn);
  49
  50         /*
  51          * If our PWWN is > than that of the r-port, we have to initiate PLOGI
  52          * and assign an Address. if not, we need to wait for its PLOGI.
  53          *
  54          * If our PWWN is < than that of the remote port, it will send a PLOGI
  55          * with the PIDs assigned. The rport state machine take care of this
  56          * incoming PLOGI.
  57          */
  58         if (memcmp
  59             ((void *)&pcfg->pwwn, (void *)&n2n_port->rem_port_wwn,
  60              sizeof(wwn_t)) > 0) {
  61                 port->pid = N2N_LOCAL_PID;
  62                 /**
  63                  * First, check if we know the device by pwwn.
  64                  */
  65                 rport = bfa_fcs_port_get_rport_by_pwwn(port,
  66                                                        n2n_port->rem_port_wwn);
  67                 if (rport) {
  68                         bfa_trc(port->fcs, rport->pid);
  69                         bfa_trc(port->fcs, rport->pwwn);
  70                         rport->pid = N2N_REMOTE_PID;
  71                         bfa_fcs_rport_online(rport);
  72                         return;
  73                 }
  74
  75                 /*
  76                  * In n2n there can be only one rport. Delete the old one whose
  77                  * pid should be zero, because it is offline.
  78                  */
  79                 if (port->num_rports > 0) {
  80                         rport = bfa_fcs_port_get_rport_by_pid(port, 0);
  81                         bfa_assert(rport != NULL);
  82                         if (rport) {
  83                                 bfa_trc(port->fcs, rport->pwwn);
  84                                 bfa_fcs_rport_delete(rport);
  85                         }
  86                 }
  87                 bfa_fcs_rport_create(port, N2N_REMOTE_PID);
  88         }
  89 }
  90
  91 /**
  92  *   Called by fcs/port to notify transition to offline state.
  93  */
  94 void
  95 bfa_fcs_port_n2n_offline(struct bfa_fcs_port_s *port)
  96 {
  97         struct bfa_fcs_port_n2n_s *n2n_port = &port->port_topo.pn2n;
  98
  99         bfa_trc(port->fcs, port->pid);
 100         port->pid = 0;
 101         n2n_port->rem_port_wwn = 0;
 102         n2n_port->reply_oxid = 0;
 103 }
 104
 105