linux/include/scsi
Mike Christie 35e9a9f939 SCSI: add 1024 max sectors black list flag
This works around a issue with qnap iscsi targets not handling large IOs
very well.

The target returns:

VPD INQUIRY: Block limits page (SBC)
  Maximum compare and write length: 1 blocks
  Optimal transfer length granularity: 1 blocks
  Maximum transfer length: 4294967295 blocks
  Optimal transfer length: 4294967295 blocks
  Maximum prefetch, xdread, xdwrite transfer length: 0 blocks
  Maximum unmap LBA count: 8388607
  Maximum unmap block descriptor count: 1
  Optimal unmap granularity: 16383
  Unmap granularity alignment valid: 0
  Unmap granularity alignment: 0
  Maximum write same length: 0xffffffff blocks
  Maximum atomic transfer length: 0
  Atomic alignment: 0
  Atomic transfer length granularity: 0

and it is *sometimes* able to handle at least one IO of size up to 8 MB. We
have seen in traces where it will sometimes work, but other times it
looks like it fails and it looks like it returns failures if we send
multiple large IOs sometimes. Also it looks like it can return 2 different
errors. It will sometimes send iscsi reject errors indicating out of
resources or it will send invalid cdb illegal requests check conditions.
And then when it sends iscsi rejects it does not seem to handle retries
when there are command sequence holes, so I could not just add code to
try and gracefully handle that error code.

The problem is that we do not have a good contact for the company,
so we are not able to determine under what conditions it returns
which error and why it sometimes works.

So, this patch just adds a new black list flag to set targets like this to
the old max safe sectors of 1024. The max_hw_sectors changes added in 3.19
caused this regression, so I also ccing stable.

Reported-by: Christian Hesse <list@eworm.de>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: stable@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-27 09:38:06 -07:00
..
fc
fc_encode.h
fc_frame.h
fcoe_sysfs.h
iscsi_if.h libiscsi: return new error code when nop times out 2014-08-01 08:16:39 -04:00
iscsi_proto.h
libfc.h scsi: drop reason argument from ->change_queue_depth 2014-11-24 14:45:27 +01:00
libfcoe.h
libiscsi.h scsi: drop reason argument from ->change_queue_depth 2014-11-24 14:45:27 +01:00
libiscsi_tcp.h
libsas.h Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus 2014-12-18 05:56:29 -08:00
osd_attributes.h
osd_initiator.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
osd_ore.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
osd_protocol.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
osd_sec.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
osd_sense.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
osd_types.h Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
sas.h
sas_ata.h
scsi.h scsi: use external buffer for command logging 2015-01-09 15:44:29 +01:00
scsi_bsg_iscsi.h
scsi_cmnd.h scsi: stop passing a gfp_mask argument down the command setup path 2014-11-24 19:56:55 +01:00
scsi_dbg.h scsi: Conditionally compile in constants.c 2015-01-09 15:44:31 +01:00
scsi_device.h scsi_logging: return void for dev_printk() functions 2015-02-04 08:00:24 -08:00
scsi_devinfo.h SCSI: add 1024 max sectors black list flag 2015-04-27 09:38:06 -07:00
scsi_dh.h
scsi_driver.h scsi: remove scsi_driver owner field 2014-11-24 20:01:28 +01:00
scsi_eh.h libata-eh: Set 'information' field for autosense 2015-03-27 11:59:22 -04:00
scsi_host.h block: support different tag allocation policy 2015-01-23 14:15:46 -07:00
scsi_ioctl.h scsi: split scsi_nonblockable_ioctl 2014-11-12 11:16:11 +01:00
scsi_tcq.h block: support different tag allocation policy 2015-01-23 14:15:46 -07:00
scsi_transport.h scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
scsi_transport_fc.h scsi_transport_fc: Add support for 25Gbit speed 2015-04-10 07:40:32 -07:00
scsi_transport_iscsi.h
scsi_transport_sas.h
scsi_transport_spi.h scsi: remove abuses of scsi_populate_tag 2014-11-12 11:19:41 +01:00
scsi_transport_srp.h
scsicam.h
sg.h scsi: add SG_SCSI_RESET_NO_ESCALATE flag to SG_SCSI_RESET ioctl 2014-11-12 11:15:54 +01:00
srp.h