srp_reconnect_rport(9) [centos man page]

SRP_RECONNECT_RPORT(9)						  SCSI mid layer					    SRP_RECONNECT_RPORT(9)

NAME

       srp_reconnect_rport - reconnect to an SRP target port

SYNOPSIS

       int srp_reconnect_rport(struct srp_rport * rport);

ARGUMENTS

       rport
	   -- undescribed --

DESCRIPTION

       Blocks SCSI command queueing before invoking reconnect such that queuecommand won't be invoked concurrently with reconnect from outside the
       SCSI EH. This is important since a reconnect implementation may reallocate resources needed by queuecommand.

NOTES

       - This function neither waits until outstanding requests have finished nor tries to abort these. It is the responsibility of the reconnect
       function to finish outstanding commands before reconnecting to the target port. - It is the responsibility of the caller to ensure that the
       resources reallocated by the reconnect function won't be used while this function is in progress. One possible strategy is to invoke this
       function from the context of the SCSI EH thread only. Another possible strategy is to lock the rport mutex inside each SCSI LLD callback
       that can be invoked by the SCSI EH (the scsi_host_template.eh_*() functions and also the scsi_host_template.queuecommand function).

AUTHORS

       James Bottomley <James.Bottomley@hansenpartnership.com>
	   Author.

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						    SRP_RECONNECT_RPORT(9)

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@hansenpartnership.com>
	   Author.

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						     FC_REMOTE_PORT_ADD(9)