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author | Jarod Wilson <jwilson@redhat.com> | 2008-03-07 07:43:01 +0100 |
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committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-03-14 00:56:59 +0100 |
commit | 51f9dbef5be41f3ff6000c874741a3a357f9bad7 (patch) | |
tree | 9ee2f70c6ce881624fc35aabc0129cafeb8fee0c /Documentation/magic-number.txt | |
parent | firewire: fw-ohci: Apple UniNorth 1st generation support (diff) | |
download | linux-51f9dbef5be41f3ff6000c874741a3a357f9bad7.tar.xz linux-51f9dbef5be41f3ff6000c874741a3a357f9bad7.zip |
firewire: fw-sbp2: set single-phase retry_limit
Per the SBP-2 specification, all SBP-2 target devices must have a BUSY_TIMEOUT
register. Per the 1394-1995 specification, the retry_limt portion of the
register should be set to 0x0 initially, and set on the target by a logged in
initiator (i.e., a Linux host w/firewire controller(s)).
Well, as it turns out, lots of devices these days have actually moved on to
starting to implement SBP-3 compliance, which says that retry_limit should
default to 0xf instead (yes, SBP-3 stomps directly on 1394-1995, oops).
Prior to this change, the firewire driver stack didn't touch retry_limit, and
any SBP-3 compliant device worked fine, while SBP-2 compliant ones were unable
to retransmit when the host returned an ack_busy_X, which resulted in stalled
out I/O, eventually causing the SCSI layer to give up and offline the device.
The simple fix is for us to set retry_limit to 0xf in the register for all
devices (which actually matches what the old ieee1394 stack did).
Prior to this change, a hard disk behind an SBP-2 Prolific PL-3507 bridge chip
would routinely encounter buffer I/O errors and wind up offlined by the SCSI
layer. With this change, I've encountered zero I/O failures moving tens of GB
of data around.
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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