On 02/02/2011 10:05 PM, Mike Christie wrote:
On 02/02/2011 09:42 PM, Bhanu Gollapudi wrote:
Actually you do not have to wait for the scsi eh to run, right. It
looks
like bnx2fc would log out the port, which ends up calling
fc_remote_port_delete and that would cause the fc timed out function
to
return BLK_EH_RESET_TIMER to prevent the scsi eh from running. Is
that
right? That type of eh strategy behavior seems like something you
want
to sync up with libfc or the fc class so all drivers do something
similar.
As per FCP-4, if the ABTS times out, we will have to explicitly LOGO the
What section is that in?
Ok read it (12.5.1, right).
target and relogin back. If we rely on 60 sec eh_abort_handler, and if
ABTS times out, SCSI error handling will go to LUN RESET, TGT reset
path, which is a generic error handling than transport specific error
handling.
If that is right, then it seems the other FC drivers are doing it wrong
then, and you hit that problem if someone sets the scsi cmd timer lower
than BNX2FC_IO_TIMEOUT. If that is right, that just does not seem right
to hack around the issue in the driver too.
So if your reading of 12.5.1 is right then libfc is wrong and it seems
other drivers (if they are not doing some magic in firmware) are wrong too.
My confidence in my FCP skills are very shaken right now :) I am not
sure I what I was thinking when I read it and reviewed libfc. I think
you need to discuss this out the fcoe list people and James Smart and
Andrew Vasquez.
I think some of them disagree with the other aborting commands (or maybe
just disagree about some of the details), so that should be discussed too.
But if you are right then you cannot work around this in a driver
specific way. You need to change libfc and the fc class in a way that
the error strategy is correct. For example from fc_timed_out you could
kick off the abort. I was slightly off on the other comment about libfc
not doing a abort from their internal timeout handler. They do an abort
still, but if that fails they let the scsi eh run eventually. I thought
they were going to clean that up too when they removed their internal
timer value in the "libfc: use rport timeout values for fcp recovery" patch.
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