[Bug 1893634] Re: blk_get_max_transfer() works only with sg

[Tom Yan]

** Description changed:

  blk_get_max_transfer() is supposed to be able to get the max_sectors
  queue limit of the scsi device on the host side and is used in both
  scsi-generic.c (for scsi-generic and scsi-block) and scsi-disk.c (for
  scsi-hd) to set/change the max_xfer_len (and opt_xfer_len in the case of
- scsi-generic).
+ scsi-generic.c).
  
  However, it only works with the sg driver in doing so. It cannot get the
  queue limit with the sd driver and simply returns MAX_INT.
  
  qemu version 5.1.0
  kernel version 5.8.5
  
  Btw, is there a particular reason that it doesn't MIN_NON_ZERO against
  the original max_xfer_len:
  https://github.com/qemu/qemu/blob/v5.1.0/hw/scsi/scsi-generic.c#L172?

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https://bugs.launchpad.net/bugs/1893634

Title:
  blk_get_max_transfer() works only with sg

Status in QEMU:
  New

Bug description:
  blk_get_max_transfer() is supposed to be able to get the max_sectors
  queue limit of the scsi device on the host side and is used in both
  scsi-generic.c (for scsi-generic and scsi-block) and scsi-disk.c (for
  scsi-hd) to set/change the max_xfer_len (and opt_xfer_len in the case
  of scsi-generic.c).

  However, it only works with the sg driver in doing so. It cannot get
  the queue limit with the sd driver and simply returns MAX_INT.

  qemu version 5.1.0
  kernel version 5.8.5

  Btw, is there a particular reason that it doesn't MIN_NON_ZERO against
  the original max_xfer_len:
  https://github.com/qemu/qemu/blob/v5.1.0/hw/scsi/scsi-generic.c#L172?

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