e58e9fbda8
Module, etc., will follow. Notes: * IDXD is an Intel silicon feature available in future Intel CPUs. Initial development is being done on a simulator. Once HW is available and the code fully tested the experimental label will be lifted. Spec can be found here: https://software.intel.com/en-us/download/intel-data-streaming-accelerator-preliminary-architecture-specification * The current implementation will only work with VFIO. * DSA has a number of engines that can be grouped based on application need such as type of memory being served or QoS. Engines are processing units and are assigned to groups. Work queues are on device structures that act as front-end groups for queueing descriptors. Full details on what is configurable & how will come in later doc patches. * There is a finite number of work queue slots that are divided amongst the number of desired work queues in some fashion (ie evenly). * SW (outside of the idxd lib) is required to manage flow control, to not over-run the work queues.This is provided in the accel plug-in module. The upper layers use public API to manage this. * Work queue submissions are done with a 64 byte atomic instruction * The design here creates a set of descriptor rings per channel that match the size of the work queues. Then, an spdk_bit_array is used to make sure we don't overrun a queue. If there are not slots available, the operation is put on a linked list to be retried later from the poller. * As we need to support any number of channels (we can't limit ourselves to the number of work queues) we need to dynamically size/resize our per channel descriptor rings based on the number of current channels. This is done from upper layers via public API into the lib. * As channels are created, the total number of work queue slots is divided across the channels evenly. Same thing when they are destroyed, remaining channels with see the ring sizes increase. This is done from upper layers via public API into the lib. * The sim has 64 total work queue entries (WQE) that get dolled out to the work queues (WQ) evenly. Signed-off-by: paul luse <paul.e.luse@intel.com> Change-Id: I899bbeda3cef3db05bea4197b8757e89dddb579d Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1809 Community-CI: Mellanox Build Bot Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Reviewed-by: Vitaliy Mysak <vitaliy.mysak@intel.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> |
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| etc/spdk | ||
| examples | ||
| go | ||
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| CHANGELOG.md | ||
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Storage Performance Development Kit
The Storage Performance Development Kit (SPDK) provides a set of tools and libraries for writing high performance, scalable, user-mode storage applications. It achieves high performance by moving all of the necessary drivers into userspace and operating in a polled mode instead of relying on interrupts, which avoids kernel context switches and eliminates interrupt handling overhead.
The development kit currently includes:
- NVMe driver
- I/OAT (DMA engine) driver
- NVMe over Fabrics target
- iSCSI target
- vhost target
- Virtio-SCSI driver
In this readme
- Documentation
- Prerequisites
- Source Code
- Build
- Unit Tests
- Vagrant
- AWS
- Advanced Build Options
- Shared libraries
- Hugepages and Device Binding
- Example Code
- Contributing
Documentation
Doxygen API documentation is available, as well as a Porting Guide for porting SPDK to different frameworks and operating systems.
Source Code
git clone https://github.com/spdk/spdk
cd spdk
git submodule update --init
Prerequisites
The dependencies can be installed automatically by scripts/pkgdep.sh.
The scripts/pkgdep.sh script will automatically install the bare minimum
dependencies required to build SPDK.
Use --help to see information on installing dependencies for optional components
./scripts/pkgdep.sh
Build
Linux:
./configure
make
FreeBSD: Note: Make sure you have the matching kernel source in /usr/src/ and also note that CONFIG_COVERAGE option is not available right now for FreeBSD builds.
./configure
gmake
Unit Tests
./test/unit/unittest.sh
You will see several error messages when running the unit tests, but they are part of the test suite. The final message at the end of the script indicates success or failure.
Vagrant
A Vagrant setup is also provided to create a Linux VM with a virtual NVMe controller to get up and running quickly. Currently this has been tested on MacOS, Ubuntu 16.04.2 LTS and Ubuntu 18.04.3 LTS with the VirtualBox and Libvirt provider. The VirtualBox Extension Pack or [Vagrant Libvirt] (https://github.com/vagrant-libvirt/vagrant-libvirt) must also be installed in order to get the required NVMe support.
Details on the Vagrant setup can be found in the SPDK Vagrant documentation.
AWS
The following setup is known to work on AWS:
Image: Ubuntu 18.04
Before running setup.sh, run modprobe vfio-pci
then: DRIVER_OVERRIDE=vfio-pci ./setup.sh
Advanced Build Options
Optional components and other build-time configuration are controlled by
settings in the Makefile configuration file in the root of the repository. CONFIG
contains the base settings for the configure script. This script generates a new
file, mk/config.mk, that contains final build settings. For advanced configuration,
there are a number of additional options to configure that may be used, or
mk/config.mk can simply be created and edited by hand. A description of all
possible options is located in CONFIG.
Boolean (on/off) options are configured with a 'y' (yes) or 'n' (no). For
example, this line of CONFIG controls whether the optional RDMA (libibverbs)
support is enabled:
CONFIG_RDMA?=n
To enable RDMA, this line may be added to mk/config.mk with a 'y' instead of
'n'. For the majority of options this can be done using the configure script.
For example:
./configure --with-rdma
Additionally, CONFIG options may also be overridden on the make command
line:
make CONFIG_RDMA=y
Users may wish to use a version of DPDK different from the submodule included in the SPDK repository. Note, this includes the ability to build not only from DPDK sources, but also just with the includes and libraries installed via the dpdk and dpdk-devel packages. To specify an alternate DPDK installation, run configure with the --with-dpdk option. For example:
Linux:
./configure --with-dpdk=/path/to/dpdk/x86_64-native-linuxapp-gcc
make
FreeBSD:
./configure --with-dpdk=/path/to/dpdk/x86_64-native-bsdapp-clang
gmake
The options specified on the make command line take precedence over the
values in mk/config.mk. This can be useful if you, for example, generate
a mk/config.mk using the configure script and then have one or two
options (i.e. debug builds) that you wish to turn on and off frequently.
Shared libraries
By default, the build of the SPDK yields static libraries against which
the SPDK applications and examples are linked.
Configure option --with-shared provides the ability to produce SPDK shared
libraries, in addition to the default static ones. Use of this flag also
results in the SPDK executables linked to the shared versions of libraries.
SPDK shared libraries by default, are located in ./build/lib. This includes
the single SPDK shared lib encompassing all of the SPDK static libs
(libspdk.so) as well as individual SPDK shared libs corresponding to each
of the SPDK static ones.
In order to start a SPDK app linked with SPDK shared libraries, make sure to do the following steps:
- run ldconfig specifying the directory containing SPDK shared libraries
- provide proper
LD_LIBRARY_PATH
Linux:
./configure --with-shared
make
ldconfig -v -n ./build/lib
LD_LIBRARY_PATH=./build/lib/ ./app/spdk_tgt/spdk_tgt
Hugepages and Device Binding
Before running an SPDK application, some hugepages must be allocated and any NVMe and I/OAT devices must be unbound from the native kernel drivers. SPDK includes a script to automate this process on both Linux and FreeBSD. This script should be run as root.
sudo scripts/setup.sh
Users may wish to configure a specific memory size. Below is an example of configuring 8192MB memory.
sudo HUGEMEM=8192 scripts/setup.sh
Example Code
Example code is located in the examples directory. The examples are compiled automatically as part of the build process. Simply call any of the examples with no arguments to see the help output. You'll likely need to run the examples as a privileged user (root) unless you've done additional configuration to grant your user permission to allocate huge pages and map devices through vfio.
Contributing
For additional details on how to get more involved in the community, including contributing code and participating in discussions and other activities, please refer to spdk.io