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>

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 262ab837a7040d5586e4212b59e569aa55a2df0c..9f77d23239a264d85a2331ea50737cbfdc88ee36 100644 (file)
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -226,6 +226,7 @@ static struct {
        {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
        {"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
        {"Promise", "", NULL, BLIST_SPARSELUN},
+       {"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
        {"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
        {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
        {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 60aae01caa89d96cd8c78681a8f0a97b44cae8ec..6efab1c455e158a71a2792c07d9b6d3fadc7595c 100644 (file)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -897,6 +897,12 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
         */
        if (*bflags & BLIST_MAX_512)
                blk_queue_max_hw_sectors(sdev->request_queue, 512);
+       /*
+        * Max 1024 sector transfer length for targets that report incorrect
+        * max/optimal lengths and relied on the old block layer safe default
+        */
+       else if (*bflags & BLIST_MAX_1024)
+               blk_queue_max_hw_sectors(sdev->request_queue, 1024);
 
        /*
         * Some devices may not want to have a start command automatically

diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index 183eaab7c3803dcd081b5a9c30a3b9963767ffe5..96e3f56519e7d9831e4b4c4ce19f78afd436242f 100644 (file)
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -36,5 +36,6 @@
                                             for sequential scan */
 #define BLIST_TRY_VPD_PAGES    0x10000000 /* Attempt to read VPD pages */
 #define BLIST_NO_RSOC          0x20000000 /* don't try to issue RSOC */
+#define BLIST_MAX_1024         0x40000000 /* maximum 1024 sector cdb length */
 
 #endif