From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Hi MST, MKP, Paolo & Co,
This is an updated -v2 series for adding T1O protection information (PI)
SGL passthrough support between virtio-scsi LLD + vhost-scsi fabric
endpoints.
The patch series is available at:
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git vhost-dif
Following Paolo's recommendations, this patch adds a new virtio_scsi command
header (virtio_scsi_cmd_req_pi) with the following elements to signal the
existence of protection information:
->do_pi_niov (DataOUT PI number of iovecs)
->di_pi_noiv (DataIN PI number of iovecs)
Also included is the change to attach protection information preceeding the
actual DataOUT + DataIN data payload, thus making a future improvement of
processing virtio buffers inline a possibility.
vhost-scsi code has also been updated to determine virtio_scsi_cmd_req or
virtio_scsi_cmd_req_pi usage based upon the first iovec's (header) length,
and then continues to process in either mode accordingly.
As with the original RFC, the virtio-scsi patch still contains a hack
to force DIX/DIF to be enabled, regardless of host provided feature bits.
This regression bug still needs to be tracked down.
v2 changes:
- Add virtio_scsi_cmd_req_pi header (Paolo + nab)
- Use virtio_scsi_cmd_req_pi instead of existing ->prio (Paolo + nab)
- Make protection buffer come before data buffer (Paolo + nab)
- Update vhost_scsi_get_tag() parameter usage (nab)
Please review.
Thanks!
--nab
Nicholas Bellinger (7):
virtio-scsi.h: Add virtio_scsi_cmd_req_pi header definition
vhost/scsi: Move sanity check into vhost_scsi_map_iov_to_sgl
vhost/scsi: Add preallocation of protection SGLs
vhost/scsi: Add T10 PI IOV -> SGL memory mapping logic
vhost/scsi: Enable T10 PI IOV -> SGL memory mapping
vhost/scsi: Add new VIRTIO_SCSI_F_T10_PI feature bit
virtio-scsi: Enable DIF/DIX modes in SCSI host LLD
drivers/scsi/virtio_scsi.c | 79 +++++++++---
drivers/vhost/scsi.c | 289 +++++++++++++++++++++++++++++--------------
include/linux/virtio_scsi.h | 15 ++-
3 files changed, 273 insertions(+), 110 deletions(-)
--
1.7.2.5
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