| Commit message (Collapse) | Author | Age | Files | Lines |
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Implement a PCI target driver using the PCI endpoint framework. This
requires hardware with a PCI controller capable of executing in endpoint
mode.
The PCI endpoint framework is used to set up a PCI endpoint function
and its BAR compatible with a NVMe PCI controller. The framework is also
used to map local memory to the PCI address space to execute MMIO
accesses for retrieving NVMe commands from submission queues and posting
completion entries to completion queues. If supported, DMA is used for
command retreival and command data transfers, based on the PCI address
segments indicated by the command using either PRPs or SGLs.
The NVMe target driver relies on the NVMe target core code to execute
all commands isssued by the host. The PCI target driver is mainly
responsible for the following:
- Initialization and teardown of the endpoint device and its backend
PCI target controller. The PCI target controller is created using a
subsystem and a port defined through configfs. The port used must be
initialized with the "pci" transport type. The target controller is
allocated and initialized when the PCI endpoint is started by binding
it to the endpoint PCI device (nvmet_pci_epf_epc_init() function).
- Manage the endpoint controller state according to the PCI link state
and the actions of the host (e.g. checking the CC.EN register) and
propagate these actions to the PCI target controller. Polling of the
controller enable/disable is done using a delayed work scheduled
every 5ms (nvmet_pci_epf_poll_cc() function). This work is started
whenever the PCI link comes up (nvmet_pci_epf_link_up() notifier
function) and stopped when the PCI link comes down
(nvmet_pci_epf_link_down() notifier function).
nvmet_pci_epf_poll_cc() enables and disables the PCI controller using
the functions nvmet_pci_epf_enable_ctrl() and
nvmet_pci_epf_disable_ctrl(). The controller admin queue is created
using nvmet_pci_epf_create_cq(), which calls nvmet_cq_create(), and
nvmet_pci_epf_create_sq() which uses nvmet_sq_create().
nvmet_pci_epf_disable_ctrl() always resets the PCI controller to its
initial state so that nvmet_pci_epf_enable_ctrl() can be called
again. This ensures correct operation if, for instance, the host
reboots causing the PCI link to be temporarily down.
- Manage the controller admin and I/O submission queues using local
memory. Commands are obtained from submission queues using a work
item that constantly polls the doorbells of all submissions queues
(nvmet_pci_epf_poll_sqs() function). This work is started whenever
the controller is enabled (nvmet_pci_epf_enable_ctrl() function) and
stopped when the controller is disabled (nvmet_pci_epf_disable_ctrl()
function). When new commands are submitted by the host, DMA transfers
are used to retrieve the commands.
- Initiate the execution of all admin and I/O commands using the target
core code, by calling a requests execute() function. All commands are
individually handled using a per-command work item
(nvmet_pci_epf_iod_work() function). A command overall execution
includes: initializing a struct nvmet_req request for the command,
using nvmet_req_transfer_len() to get a command data transfer length,
parse the command PRPs or SGLs to get the PCI address segments of
the command data buffer, retrieve data from the host (if the command
is a write command), call req->execute() to execute the command and
transfer data to the host (for read commands).
- Handle the completions of commands as notified by the
->queue_response() operation of the PCI target controller
(nvmet_pci_epf_queue_response() function). Completed commands are
added to a list of completed command for their CQ. Each CQ list of
completed command is processed using a work item
(nvmet_pci_epf_cq_work() function) which posts entries for the
completed commands in the CQ memory and raise an IRQ to the host to
signal the completion. IRQ coalescing is supported as mandated by the
NVMe base specification for PCI controllers. Of note is that
completion entries are transmitted to the host using MMIO, after
mapping the completion queue memory to the host PCI address space.
Unlike for retrieving commands from SQs, DMA is not used as it
degrades performance due to the transfer serialization needed (which
delays completion entries transmission).
The configuration of a NVMe PCI endpoint controller is done using
configfs. First the NVMe PCI target controller configuration must be
done to set up a subsystem and a port with the "pci" addr_trtype
attribute. The subsystem can be setup using a file or block device
backed namespace or using a passthrough NVMe device. After this, the
PCI endpoint can be configured and bound to the PCI endpoint controller
to start the NVMe endpoint controller.
In order to not overcomplicate this initial implementation of an
endpoint PCI target controller driver, protection information is not
for now supported. If the PCI controller port and namespace are
configured with protection information support, an error will be
returned when the controller is created and initialized when the
endpoint function is started. Protection information support will be
added in a follow-up patch series.
Using a Rock5B board (Rockchip RK3588 SoC, PCI Gen3x4 endpoint
controller) with a target PCI controller setup with 4 I/O queues and a
null_blk block device as a namespace, the maximum performance using fio
was measured at 131 KIOPS for random 4K reads and up to 2.8 GB/S
throughput. Some data points are:
Rnd read, 4KB, QD=1, 1 job : IOPS=16.9k, BW=66.2MiB/s (69.4MB/s)
Rnd read, 4KB, QD=32, 1 job : IOPS=78.5k, BW=307MiB/s (322MB/s)
Rnd read, 4KB, QD=32, 4 jobs: IOPS=131k, BW=511MiB/s (536MB/s)
Seq read, 512KB, QD=32, 1 job : IOPS=5381, BW=2691MiB/s (2821MB/s)
The NVMe PCI endpoint target driver is not intended for production use.
It is a tool for learning NVMe, exploring existing features and testing
implementations of new NVMe features.
Co-developed-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
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This patch implements the reservation feature, including:
1. reservation register(register, unregister and replace).
2. reservation acquire(acquire, preempt, preempt and abort).
3. reservation release(release and clear).
4. reservation report.
5. set feature and get feature of reservation notify mask.
6. get log page of reservation event.
Not supported:
1. persistent reservation through power loss.
Test cases:
Use nvme-cli and fio to test all implemented sub features:
1. use nvme resv-register to register host a registrant or
unregister or replace a new key.
2. use nvme resv-acquire to set host to the holder, and use fio
to send read and write io in all reservation type. And also
test preempt and "preempt and abort".
3. use nvme resv-report to show all registrants and reservation
status.
4. use nvme resv-release to release all registrants.
5. use nvme get-log to get events generated by the preceding
operations.
In addition, make reservation configurable, one can set ns to
support reservation before enable ns. The default of resv_enable
is false.
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Reviewed-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
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Add a debugfs hierarchy to display the configured subsystems
and the controllers attached to the subsystems.
Suggested-by: Redouane BOUFENGHOUR <redouane.boufenghour@shadow.tech>
Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
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Implement NVMe-oF In-Band authentication according to NVMe TPAR 8006.
This patch adds three additional configfs entries 'dhchap_key',
'dhchap_ctrl_key', and 'dhchap_hash' to the 'host' configfs directory.
The 'dhchap_key' and 'dhchap_ctrl_key' entries need to be in the ASCII
format as specified in NVMe Base Specification v2.0 section 8.13.5.8
'Secret representation'.
'dhchap_hash' defaults to 'hmac(sha256)', and can be written to to
switch to a different HMAC algorithm.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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NVMe TP 4053 – Zoned Namespaces (ZNS) allows host software to
communicate with a non-volatile memory subsystem using zones for NVMe
protocol-based controllers. NVMeOF already support the ZNS NVMe
Protocol compliant devices on the target in the passthru mode. There
are generic zoned block devices like Shingled Magnetic Recording (SMR)
HDDs that are not based on the NVMe protocol.
This patch adds ZNS backend support for non-ZNS zoned block devices as
NVMeOF targets.
This support includes implementing the new command set NVME_CSI_ZNS,
adding different command handlers for ZNS command set such as NVMe
Identify Controller, NVMe Identify Namespace, NVMe Zone Append,
NVMe Zone Management Send and NVMe Zone Management Receive.
With the new command set identifier, we also update the target command
effects logs to reflect the ZNS compliant commands.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Add passthru command handling capability for the NVMeOF target and
export passthru APIs which are used to integrate passthru
code with nvmet-core.
The new file passthru.c handles passthru cmd parsing and execution.
In the passthru mode, we create a block layer request from the nvmet
request and map the data on to the block layer request.
Admin commands and features are on an allow list as there are a number
of each that don't make too much sense with passthrough. We use an
allow list such that new commands can be considered before being blindly
passed through. In both cases, vendor specific commands are always
allowed.
We also reject reservation IO commands as the underlying device cannot
differentiate between multiple hosts behind a fabric.
Based-on-a-patch-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This patch introduces target-side request tracing. As Christoph
suggested, the trace would not be in a core or module to avoid
disadvantages like cache miss:
http://lists.infradead.org/pipermail/linux-nvme/2019-June/024721.html
The target-side trace code is entirely based on the Johannes's trace code
from the host side. It has lots of codes duplicated, but it would be
better than having advantages mentioned above.
It also traces not only fabrics commands, but also nvme normal commands.
Once the codes to be shared gets bigger, then we can make it common as
suggsted.
This also removed the create_sq and create_cq trace parsing functions
because it will be done by the connect fabrics command.
Example:
echo 1 > /sys/kernel/debug/tracing/event/nvmet/nvmet_req_init/enable
echo 1 > /sys/kernel/debug/tracing/event/nvmet/nvmet_req_complete/enable
cat /sys/kernel/debug/tracing/trace
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
[hch: fixed the symbol namespace and a an endianess conversion]
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This patch implements the TCP transport driver for the NVMe over Fabrics
target stack. This allows exporting NVMe over Fabrics functionality over
good old TCP/IP.
The driver implements the TP 8000 of how nvme over fabrics capsules and
data are encapsulated in nvme-tcp pdus and exchaged on top of a TCP byte
stream. nvme-tcp header and data digest are supported as well.
Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Roy Shterman <roys@lightbitslabs.com>
Signed-off-by: Solganik Alexander <sashas@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This patch adds simple file backed namespace support for NVMeOF target.
The new file io-cmd-file.c is responsible for handling the code for I/O
commands when ns is file backed. Also, we introduce mempools based slow
path using sync I/Os for file backed ns to ensure forward progress under
reclaim.
The old block device based implementation is moved to io-cmd-bdev.c and
use a "nvmet_bdev_" symbol prefix. The enable/disable calls are also
move into the respective files.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[hch: updated changelog, fixed double req->ns lookup in bdev case]
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Add FC LLDD loopback driver to test FC host and target transport within
nvme-fabrics
To aid in the development and testing of the lower-level api of the FC
transport, this loopback driver has been created to act as if it were a
FC hba driver supporting both the host interfaces as well as the target
interfaces with the nvme FC transport.
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Implements the FC-NVME T11 definition of how nvme fabric capsules are
performed on an FC fabric. Utilizes a lower-layer API to FC host adapters
to send/receive FC-4 LS operations and perform the FCP transactions
necessary to perform and FCP IO request for NVME.
The T11 definitions for FC-4 Link Services are implemented which create
NVMeOF connections. Implements the hooks with nvmet layer to pass NVME
commands to it for processing and posting of data/response base to the
host via the different connections.
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This patch implements the RDMA transport for the NVMe over Fabrics target,
which allows exporting NVMe over Fabrics functionality over RDMA fabrics
(Infiniband, RoCE, iWARP).
All NVMe logic is in the generic target and this module just provides a
small glue between it and the generic code in the RDMA subsystem.
Signed-off-by: Armen Baloyan <armenx.baloyan@intel.com>,
Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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This patch implements adds nvme-loop which allows to access local devices
exported as NVMe over Fabrics namespaces. This module can be useful for
easy evaluation, testing and also feature experimentation.
To createa nvme-loop device you need to configure the NVMe target to
export a loop port (see the nvmetcli documentaton for that) and then
connect to it using
nvme connect-all -t loop
which requires the very latest nvme-cli version with Fabrics support.
Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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This patch introduces a implementation of NVMe subsystems,
controllers and discovery service which allows to export
NVMe namespaces across fabrics such as Ethernet, FC etc.
The implementation conforms to the NVMe 1.2.1 specification
and interoperates with NVMe over fabrics host implementations.
Configuration works using configfs, and is best performed using
the nvmetcli tool from http://git.infradead.org/users/hch/nvmetcli.git,
which also has a detailed explanation of the required steps in the
README file.
Signed-off-by: Armen Baloyan <armenx.baloyan@intel.com>
Signed-off-by: Anthony Knapp <anthony.j.knapp@intel.com>
Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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