The timeout field in the CAPS register is defined to be 8 bits, so its type was
uint8_t. We recently started adding 1 to it to cope with rogue devices that
listed 0 timeout time (which is impossible). However, in so doing, other devices
that list 0xff (for a 2 minute timeout) were broken when adding 1
overflowed. Widen the type to be uint32_t like its source register to avoid the
issue.
Reported by: bapt@
While we print failure messages on the console, sometimes logs are lost or
overwhelmed. Keeping a count of how many times we've failed retriable commands
helps get a magnitude of the problem.
Retried commands can indicate a performance degredation of an nvme drive. Keep
track of the number of retries and report it out via sysctl, just like number of
commands an interrupts.
Also convert it to a bool. While the rest of the driver isn't yet bool clean,
this will help.
Reviewed by: cem@
Differential Revision: https://reviews.freebsd.org/D20988
The nvme drive dumps only the most relevant details about a command when it
fails. However, there are times this is not sufficient (such as debugging weird
issues for a new drive with a vendor). Setting hw.nvme.verbose_cmd_dump=1
in loader.conf will enable more complete debugging information about each
command that fails.
Reviewed by: rpokala
Sponsored by: Netflix
Differential Version: https://reviews.freebsd.org/D20988
These macros make places where we extract these easier to read. The shift and
mask stuff is also a bit tedious and error prone. Start with the CAP_LO and
CAP_HI registers since their scope is somewhat constrained. This is style
chagne only, no functional changes.
Reviewed by: chuck
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20979
Neither the 1.3 or 1.4 standards say this number is 1's based, but adding 1
costs little and copes with those NVMe drives that report '0' in this field
cheaply. This is consistent with what the Linux driver does as well.
Differentiate between PCI Express Endpoint devices and Root Complex
Integrated Endpoints in the nda driver. The Link Status and Capability
registers are not valid for Integrated Endpoints and should not be
displayed. The bhyve emulated NVMe device will advertise as being an
Integrated Endpoint.
Reviewed by: imp
Approved byL imp (mentor)
Differential Revision: https://reviews.freebsd.org/D20282
completions are not in a consistent state. Cope with the different
places the normal I/O completion polling thread can be interrupted and
then re-entered during a kernel panic + dump.
Reviewed by: jhb and markj (both prior versions)
Differential Revision: https://reviews.freebsd.org/D20478
Maintain symmetry with nvme_ctrlr_create_qpairs, making it easier to
match init/uninit scenarios.
Signed-off-by: John Meneghini <johnm@netapp.com>
Submitted by: Michael Hordijk <hordijk@netapp.com>
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D19781
retries.
When resetting the controller, we abort I/O. Prior to this fix, we
printed a ton of abort messages for I/O that we're going to
retry. This imparts no useful information. Stop printing them unless
our retry count is exhausted. Clarify code for when we don't retry,
and remove useless arg to a routine that's always called with it
as 'true'. All the other debug is still printed (including multiple
reset messages if we have multiple timeouts before the taskqueue
runs the actual reset) so that we know when we reset.
Reviewed by: jimharris@, chuck@
Differential Revision: https://reviews.freebsd.org/D19431
supporting older kernels. However, all supported versions of FreeBSD
have unmapped I/Os (as do several that have gone EOL), remove it. It's
unlikely the driver would work on the older kernels anyway at this
point.
supported in years. A number of changes have been made to the driver
that likely wouldn't work on those older versions that aren't properly
ifdef'd and it's project policy to GC such code once it is stale.
Use recent best practices for Copyright form at the top of
the license:
1. Remove all the All Rights Reserved clauses on our stuff. Where we
piggybacked others, use a separate line to make things clear.
2. Use "Netflix, Inc." everywhere.
3. Use a single line for the copyright for grep friendliness.
4. Use date ranges in all places for our stuff.
Approved by: Netflix Legal (who gave me the form), adrian@ (pmc files)
o In vm_pager_bufferinit() create pbuf_zone and start accounting on how many
pbufs are we going to have set.
In various subsystems that are going to utilize pbufs create private zones
via call to pbuf_zsecond_create(). The latter calls uma_zsecond_create(),
and sets a limit on created zone. After startup preallocate pbufs according
to requirements of all pbuf zones.
Subsystems that used to have a private limit with old allocator now have
private pbuf zones: md(4), fusefs, NFS client, smbfs, VFS cluster, FFS,
swap, vnode pager.
The following subsystems use shared pbuf zone: cam(4), nvme(4), physio(9),
aio(4). They should have their private limits, but changing that is out of
scope of this commit.
o Fetch tunable value of kern.nswbuf from init_param2() and while here move
NSWBUF_MIN to opt_param.h and eliminate opt_swap.h, that was holding only
this option.
Default values aren't touched by this commit, but they probably should be
reviewed wrt to modern hardware.
This change removes a tight bottleneck from sendfile(2) operation, that
uses pbufs in vnode pager. Other pagers also would benefit from faster
allocation.
Together with: gallatin
Tested by: pho
Dell-branded Intel P4600 NVMe drives benefit from NVMe 1.3's NOIOB
feature. Unfortunately just like Intel DC P4500s, they don't advertise
themselves as benefiting from this...
This changes adds P4600s to the existing list of old drives which
benefit from striping.
PR: 233969
Submitted by: David Fugate <dave.fugate@gmail.com>
Reviewed by: imp, mav
Approved by: imp (mentor)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D18772
CAM does not require SIM lock since FreeBSD 10.4, and NVMe code never
required it at all, using per-queue locks instead. This formally allows
parallel request submission in CAM mode as much as single per-device and
per-queue locks of CAM allow.
MFC after: 1 month
In the nda(4) driver, only set DISKFLAG_CANDELETE (a.k.a. can support
BIO_DELETE) if the drive supports Dataset Management. There are reports
that without this check, VMWare Workstation does not work reliably.
Fix is to check the ONCS field in the NVMe Controller Data structure for
support. This check previously existed but did not survive the
big-endian changes.
Reported by: yuripv@yuripv.net
Reviewed by: imp, mav, jimharris
Approved by: imp (mentor)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D18493
At least one NVMe drive has a bug that makeing the Command Time Out
PCIe feature unreliable. The workaround is to disable this
feature. The driver wouldn't deal correctly with a timeout anyway.
Only do this for drives that are known bad.
Sponsored by: Netflix, Inc
Differential Revision: https://reviews.freebsd.org/D17708
The original NVMe API used bit-fields to represent fields in data
structures defined by the specification (e.g. the op-code in the command
data structure). The implementation targeted x86_64 processors and
defined the bit fields for little endian dwords (i.e. 32 bits).
This approach does not work as-is for big endian architectures and was
changed to use a combination of bit shifts and masks to support PowerPC.
Unfortunately, this changed the NVMe API and forces #ifdef's based on
the OS revision level in user space code.
This change reverts to something that looks like the original API, but
it uses bytes instead of bit-fields inside the packed command structure.
As a bonus, this works as-is for both big and little endian CPU
architectures.
Bump __FreeBSD_version to 1200081 due to API change
Reviewed by: imp, kbowling, smh, mav
Approved by: imp (mentor)
Differential Revision: https://reviews.freebsd.org/D16404
Summary:
Some architectures, in this case powerpc64, need explicit synchronization
barriers vs device accesses.
Prior to this change, when running 'make buildworld -j72' on a 18-core
(72-thread) POWER9, I would see controller resets often. With this change, I
don't see these resets messages, though another tester still does, for yet to be
determined reasons, so this may not be a complete fix. Additionally, I see a
~5-10% speed up in buildworld times, likely due to not needing to reset the
controller.
Reviewed By: jimharris
Differential Revision: https://reviews.freebsd.org/D16570
- Remove layering violation, when NVMe SIM code accessed CAM internal
device structures to set pointers on controller and namespace data.
Instead make NVMe XPT probe fetch the data directly from hardware.
- Cleanup NVMe SIM code, fixing support for multiple namespaces per
controller (reporting them as LUNs) and adding controller detach support
and run-time namespace change notifications.
- Add initial support for namespace change async events. So far only
in CAM mode, but it allows run-time namespace arrival and departure.
- Add missing nvme_notify_fail_consumers() call on controller detach.
Together with previous changes this allows NVMe device detach/unplug.
Non-CAM mode still requires a lot of love to stay on par, but at least
CAM mode code should not stay in the way so much, becoming much more
self-sufficient.
Reviewed by: imp
MFC after: 1 month
Sponsored by: iXsystems, Inc.
Admin pass-through requests took controller lock before the queue lock,
but in case of request submission to a failed controller controller lock
was taken after the queue lock. Fix that by reducing the lock scopes and
switching to mtx_pool locks to track pass-through request completion.
Sponsored by: iXsystems, Inc.
This change allows clean device detach on attach failures and driver unload,
while previous code tried to talk to already shut down controller, or even
accessed resources failed to allocate.
Sponsored by: iXsystems, Inc.
dma_tag_payload should not be destroyed before payload_dma_map, and seems
it should be used there instead of dma_tag to match creation.
Sponsored by: iXsystems, Inc.
that cross this boundary, they perform better when this isn't the
case. Intel uses the 3rd byte in the vendor specific area for
this. The DC P3500 was previously listed without any explanation. Add
the DC P3520 and DC P4500 to the list.
There won't be any others drives needing this quirk. Intel has
standardized a field in the namespace data in 1.3 (noiob). A future
patch will use that if it exists, with fallback to this method.
Submitted by: Keith Busch
Reviewed by: jimharris@
latter casts the LBA to a 32-bit number before assigning it to the 64
bit structure entity. This works fine on the first 2TB of TRIMs, but
terrible beyond that due to trucation.
Also, add an assert to make sure we don't end too many DSM TRIM
entries in one request.
Sponsored by: Netflix
On some systems, we're getting timeouts when we use multiple queues on
drives that work perfectly well on other systems. On a hunch, Jim
Harris suggested I poll the completion queue when we get a timeout.
This patch polls the completion queue if no fatal status was
indicated. If it had pending I/O, we complete that request and
return. Otherwise, if aborts are enabled and no fatal status, we abort
the command and return. Otherwise we reset the card.
This may clear up the problem, or we may see it result in lots of
timeouts and a performance problem. Either way, we'll know the next
step. We may also need to pay attention to the fatal status bit
of the controller.
PR: 211713
Suggested by: Jim Harris
Sponsored by: Netflix
The NVME standard has required in section 7.2.6, since at least 1.1,
that a clean shutdown is signalled by deleting the subission and the
completion queues before setting the shutdown bit in CC. The 1.0
standard, apparently, did not and many of the early Intel cards didn't
care. Some newer cards care, at least one whose beta firmware can
scramble the card on an unclean shutdown. Linux has done this for some
time. To make it possible to move forward with an evaluation of this
pre-release card with wonky firmware, delete the queues on the card
when we delete the qpair structures.
Sponsored by: Netflix
We'll need to delete namespaces soon, so go ahead and stop making
these devices eternal. It doesn't help much, and will be getting in
the way soon.
Sponsored by: Netflix
When multiple trims are in the queue, collapse them as much as
possible. At present, this usually results in only a few trims being
collapsed together, but more work on that will make it possible to do
hundreds (up to some configurable max).
Sponsored by: Netflix
Remove bitfields from defined structures as they are not portable.
Instead use shift and mask macros in the driver and nvmecontrol application.
NVMe is now working on powerpc64 host.
Submitted by: Michal Stanek <mst@semihalf.com>
Obtained from: Semihalf
Reviewed by: imp, wma
Sponsored by: IBM, QCM Technologies
Differential revision: https://reviews.freebsd.org/D13916
