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FC_REMOTE_PORT_ADD(9)                     SCSI mid layer                    FC_REMOTE_PORT_ADD(9)



NAME
       fc_remote_port_add - notify fc transport of the existence of a remote FC port.

SYNOPSIS
       struct fc_rport * fc_remote_port_add(struct Scsi_Host * shost, int channel,
                                            struct fc_rport_identifiers * ids);

ARGUMENTS
       shost
           scsi host the remote port is connected to.

       channel
           Channel on shost port connected to.

       ids
           The world wide names, fc address, and FC4 port roles for the remote port.

DESCRIPTION
       The LLDD calls this routine to notify the transport of the existence of a remote port. The
       LLDD provides the unique identifiers (wwpn,wwn) of the port, it's FC address (port_id),
       and the FC4 roles that are active for the port.

       For ports that are FCP targets (aka scsi targets), the FC transport maintains consistent
       target id bindings on behalf of the LLDD. A consistent target id binding is an assignment
       of a target id to a remote port identifier, which persists while the scsi host is
       attached. The remote port can disappear, then later reappear, and it's target id
       assignment remains the same. This allows for shifts in FC addressing (if binding by wwpn
       or wwnn) with no apparent changes to the scsi subsystem which is based on scsi host number
       and target id values. Bindings are only valid during the attachment of the scsi host. If
       the host detaches, then later re-attaches, target id bindings may change.

       This routine is responsible for returning a remote port structure. The routine will search
       the list of remote ports it maintains internally on behalf of consistent target id
       mappings. If found, the remote port structure will be reused. Otherwise, a new remote port
       structure will be allocated.

       Whenever a remote port is allocated, a new fc_remote_port class device is created.

       Should not be called from interrupt context.

NOTES
       This routine assumes no locks are held on entry.

AUTHORS
       James Bottomley <James.Bottomley AT hansenpartnership.com>
           Author.

       Rob Landley <rob AT landley.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                     FC_REMOTE_PORT_ADD(9)


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