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

From: Launchpad Bug Tracker
Subject: [Bug 1893634] Re: blk_get_max_transfer() works only with sg
Date: Thu, 08 Jul 2021 04:17:29 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  blk_get_max_transfer() works only with sg

Status in QEMU:

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:

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