src/sys/dev/virtio/block, branch releng/12.2

MFC r360229, r363255

2020-09-13T23:51:07+00:00

MFS r365614

r360229:
Add VIRTIO_BLK_T_DISCARD (TRIM) support to the bhyve virtio-blk backend

This will advertise support for TRIM to the guest virtio-blk driver and
perform the DIOCGDELETE ioctl on the backing storage if it supports it.

Thanks to Jason King and others at Joyent and illumos for expanding on
my original patch, adding improvements including better error handling
and making sure to following the virtio spec.

r363255:
Add VIRTIO_BLK_T_DISCARD support to the virtio-blk driver

If the hypervisor advertises support for the DISCARD command then the
guest can perform TRIM commands, freeing space on the backing store.

If VIRTIO_BLK_F_DISCARD is enabled, advertise DISKFLAG_CANDELETE

Tested with FreeBSD guests on bhyve and KVM

Approved by:	re (gjb)
Relnotes:	yes
Sponsored by:	Klara Inc.

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-27T14:52:40+00:00

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-20T19:36:21+00:00

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Create an API to reset a struct bio (g_reset_bio). This is mandatory

2016-02-17T17:16:02+00:00

for all struct bio you get back from g_{new,alloc}_bio. Temporary
bios that you create on the stack or elsewhere should use this before
first use of the bio, and between uses of the bio. At the moment, it
is nothing more than a wrapper around bzero, but that may change in
the future. The wrapper also removes one place where we encode the
size of struct bio in the KBI.

Do not report stripe size if it is equal to sector size.

2015-04-18T19:37:37+00:00

MFC after:	1 week

Size of opt_io_size field is 32 bit.

2015-03-05T10:29:46+00:00

MFC after:	2 weeks

Reenable VIRTIO_BLK_F_TOPOLOGY feature.

2015-03-05T09:51:59+00:00

MFC after:	2 weeks

Rework vtblk dump handling of in flight requests

2015-01-27T05:34:46+00:00

Previously, the driver resets the device and abandon the requests that
are caught in flight when the dump was initiated. This was problematic
if the system is resumed after the dump is completed.

While that is probably not the typical action, it is simple to rework
the driver to very likely have the device usable after the dump without
making it more likely for the dump to fail. The in flight requests are
simply queued for completion once the dump is finished.

Requested by:	markj
MFC after:	1 month

Cleanup and performance improvement of the virtio_blk driver

2014-11-30T16:36:26+00:00

  - Add support for GEOM direct completion. Depending on the benchmark,
    this tends to give a ~30% improvement w.r.t IOPs and BW.
  - Remove an invariants check in the strategy routine. This assertion
    is caught later on by an existing panic.
  - Rename and resort various related functions to make more sense.

MFC after:	1 month

Add Virtio MMIO bus driver.

2014-11-18T14:11:14+00:00

Sponsored by:	DARPA, AFRL