aborting an out of sequence cmdSN

["Eddy Quicksall" <Eddy@Quicksall.com>]

If a command is received out of sequence, it is not passed to the SCSI
Target Layer. So, it must be queued waiting for the prior command. Now, if
the prior command never comes the operating system may attempt to abort the
lost command by sending an abort to the driver.

The abort can't be turned into an ABORT TASK TMF because the target iSCSI
has not acknowledged that it has received the original command yet. And,
even if the ABORT TASK was sent, it can't get to the SCSI Target Layer
because its cmdSN will be higher than the most recent command.

The iSCSI initiator drive could just jerk it out of its queue (knowing that
it hasn't been acknowledged yet) but then the iSCSI target may still execute
it when the missing PDU's arrive.

Does iSCSI have a way to abort the commands that are in the target but not
yet in the SCSI Target Layer?

Eddy