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[66.187.232.132]) by smtp.gmail.com with ESMTPSA id jt4-20020a05621427e400b00699047948besm4423124qvb.59.2024.04.04.06.22.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Apr 2024 06:22:57 -0700 (PDT) From: Maryam Tahhan To: mtahhan@redhat.com Cc: stable@dpdk.org Subject: [v12 1/3] docs: AF_XDP Device Plugin Date: Thu, 4 Apr 2024 09:22:48 -0400 Message-ID: <20240404132254.1184368-2-mtahhan@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20240404132254.1184368-1-mtahhan@redhat.com> References: <20240404132254.1184368-1-mtahhan@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Fixup the references to the AF_XDP Device Plugin in the documentation (was referred to as CNI previously) and document the single netdev limitation for deploying an AF_XDP based DPDK pod. Also renames af_xdp_cni.rst to af_xdp_dp.rst Fixes: 7fc6ae50369d ("net/af_xdp: support CNI Integration") Cc: stable@dpdk.org Signed-off-by: Maryam Tahhan --- doc/guides/howto/af_xdp_cni.rst | 253 --------------------------- doc/guides/howto/af_xdp_dp.rst | 299 ++++++++++++++++++++++++++++++++ doc/guides/howto/index.rst | 2 +- doc/guides/nics/af_xdp.rst | 4 +- 4 files changed, 302 insertions(+), 256 deletions(-) delete mode 100644 doc/guides/howto/af_xdp_cni.rst create mode 100644 doc/guides/howto/af_xdp_dp.rst diff --git a/doc/guides/howto/af_xdp_cni.rst b/doc/guides/howto/af_xdp_cni.rst deleted file mode 100644 index a1a6d5b99c..0000000000 --- a/doc/guides/howto/af_xdp_cni.rst +++ /dev/null @@ -1,253 +0,0 @@ -.. SPDX-License-Identifier: BSD-3-Clause - Copyright(c) 2023 Intel Corporation. - -Using a CNI with the AF_XDP driver -================================== - -Introduction ------------- - -CNI, the Container Network Interface, is a technology for configuring -container network interfaces -and which can be used to setup Kubernetes networking. -AF_XDP is a Linux socket Address Family that enables an XDP program -to redirect packets to a memory buffer in userspace. - -This document explains how to enable the `AF_XDP Plugin for Kubernetes`_ within -a DPDK application using the :doc:`../nics/af_xdp` to connect and use these technologies. - -.. _AF_XDP Plugin for Kubernetes: https://github.com/intel/afxdp-plugins-for-kubernetes - - -Background ----------- - -The standard :doc:`../nics/af_xdp` initialization process involves loading an eBPF program -onto the kernel netdev to be used by the PMD. -This operation requires root or escalated Linux privileges -and thus prevents the PMD from working in an unprivileged container. -The AF_XDP CNI plugin handles this situation -by providing a device plugin that performs the program loading. - -At a technical level the CNI opens a Unix Domain Socket and listens for a client -to make requests over that socket. -A DPDK application acting as a client connects and initiates a configuration "handshake". -The client then receives a file descriptor which points to the XSKMAP -associated with the loaded eBPF program. -The XSKMAP is a BPF map of AF_XDP sockets (XSK). -The client can then proceed with creating an AF_XDP socket -and inserting that socket into the XSKMAP pointed to by the descriptor. - -The EAL vdev argument ``use_cni`` is used to indicate that the user wishes -to run the PMD in unprivileged mode and to receive the XSKMAP file descriptor -from the CNI. -When this flag is set, -the ``XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD`` libbpf flag -should be used when creating the socket -to instruct libbpf not to load the default libbpf program on the netdev. -Instead the loading is handled by the CNI. - -.. note:: - - The Unix Domain Socket file path appear in the end user is "/tmp/afxdp.sock". - - -Prerequisites -------------- - -Docker and container prerequisites: - -* Set up the device plugin - as described in the instructions for `AF_XDP Plugin for Kubernetes`_. - -* The Docker image should contain the libbpf and libxdp libraries, - which are dependencies for AF_XDP, - and should include support for the ``ethtool`` command. - -* The Pod should have enabled the capabilities ``CAP_NET_RAW`` and ``CAP_BPF`` - for AF_XDP along with support for hugepages. - -* Increase locked memory limit so containers have enough memory for packet buffers. - For example: - - .. code-block:: console - - cat << EOF | sudo tee /etc/systemd/system/containerd.service.d/limits.conf - [Service] - LimitMEMLOCK=infinity - EOF - -* dpdk-testpmd application should have AF_XDP feature enabled. - - For further information see the docs for the: :doc:`../../nics/af_xdp`. - - -Example -------- - -Howto run dpdk-testpmd with CNI plugin: - -* Clone the CNI plugin - - .. code-block:: console - - # git clone https://github.com/intel/afxdp-plugins-for-kubernetes.git - -* Build the CNI plugin - - .. code-block:: console - - # cd afxdp-plugins-for-kubernetes/ - # make build - - .. note:: - - CNI plugin has a dependence on the config.json. - - Sample Config.json - - .. code-block:: json - - { - "logLevel":"debug", - "logFile":"afxdp-dp-e2e.log", - "pools":[ - { - "name":"e2e", - "mode":"primary", - "timeout":30, - "ethtoolCmds" : ["-L -device- combined 1"], - "devices":[ - { - "name":"ens785f0" - } - ] - } - ] - } - - For further reference please use the `config.json`_ - - .. _config.json: https://github.com/intel/afxdp-plugins-for-kubernetes/blob/v0.0.2/test/e2e/config.json - -* Create the Network Attachment definition - - .. code-block:: console - - # kubectl create -f nad.yaml - - Sample nad.yml - - .. code-block:: yaml - - apiVersion: "k8s.cni.cncf.io/v1" - kind: NetworkAttachmentDefinition - metadata: - name: afxdp-e2e-test - annotations: - k8s.v1.cni.cncf.io/resourceName: afxdp/e2e - spec: - config: '{ - "cniVersion": "0.3.0", - "type": "afxdp", - "mode": "cdq", - "logFile": "afxdp-cni-e2e.log", - "logLevel": "debug", - "ipam": { - "type": "host-local", - "subnet": "192.168.1.0/24", - "rangeStart": "192.168.1.200", - "rangeEnd": "192.168.1.216", - "routes": [ - { "dst": "0.0.0.0/0" } - ], - "gateway": "192.168.1.1" - } - }' - - For further reference please use the `nad.yaml`_ - - .. _nad.yaml: https://github.com/intel/afxdp-plugins-for-kubernetes/blob/v0.0.2/test/e2e/nad.yaml - -* Build the Docker image - - .. code-block:: console - - # docker build -t afxdp-e2e-test -f Dockerfile . - - Sample Dockerfile: - - .. code-block:: console - - FROM ubuntu:20.04 - RUN apt-get update -y - RUN apt install build-essential libelf-dev -y - RUN apt-get install iproute2 acl -y - RUN apt install python3-pyelftools ethtool -y - RUN apt install libnuma-dev libjansson-dev libpcap-dev net-tools -y - RUN apt-get install clang llvm -y - COPY ./libbpf.tar.gz /tmp - RUN cd /tmp && tar -xvmf libbpf.tar.gz && cd libbpf/src && make install - COPY ./libxdp.tar.gz /tmp - RUN cd /tmp && tar -xvmf libxdp.tar.gz && cd libxdp && make install - - .. note:: - - All the files that need to COPY-ed should be in the same directory as the Dockerfile - -* Run the Pod - - .. code-block:: console - - # kubectl create -f pod.yaml - - Sample pod.yaml: - - .. code-block:: yaml - - apiVersion: v1 - kind: Pod - metadata: - name: afxdp-e2e-test - annotations: - k8s.v1.cni.cncf.io/networks: afxdp-e2e-test - spec: - containers: - - name: afxdp - image: afxdp-e2e-test:latest - imagePullPolicy: Never - env: - - name: LD_LIBRARY_PATH - value: /usr/lib64/:/usr/local/lib/ - command: ["tail", "-f", "/dev/null"] - securityContext: - capabilities: - add: - - CAP_NET_RAW - - CAP_BPF - resources: - requests: - hugepages-2Mi: 2Gi - memory: 2Gi - afxdp/e2e: '1' - limits: - hugepages-2Mi: 2Gi - memory: 2Gi - afxdp/e2e: '1' - - For further reference please use the `pod.yaml`_ - - .. _pod.yaml: https://github.com/intel/afxdp-plugins-for-kubernetes/blob/v0.0.2/test/e2e/pod-1c1d.yaml - -* Run DPDK with a command like the following: - - .. code-block:: console - - kubectl exec -i --container -- \ - //dpdk-testpmd -l 0,1 --no-pci \ - --vdev=net_af_xdp0,use_cni=1,iface= \ - -- --no-mlockall --in-memory - -For further reference please use the `e2e`_ test case in `AF_XDP Plugin for Kubernetes`_ - - .. _e2e: https://github.com/intel/afxdp-plugins-for-kubernetes/tree/v0.0.2/test/e2e diff --git a/doc/guides/howto/af_xdp_dp.rst b/doc/guides/howto/af_xdp_dp.rst new file mode 100644 index 0000000000..7166d904bd --- /dev/null +++ b/doc/guides/howto/af_xdp_dp.rst @@ -0,0 +1,299 @@ +.. SPDX-License-Identifier: BSD-3-Clause + Copyright(c) 2023 Intel Corporation. + +Using the AF_XDP driver in Kubernetes +===================================== + +Introduction +------------ + +Two infrastructure components are needed in order to provision a pod that is +using the AF_XDP PMD in Kubernetes: + +1. AF_XDP Device Plugin (DP). +2. AF_XDP Container Network Interface (CNI) binary. + +Both of these components are available through the `AF_XDP Device Plugin for Kubernetes`_ +repository. + +The AF_XDP DP provisions and advertises networking interfaces to Kubernetes, +while the CNI configures and plumbs network interfaces for the Pod. + +This document explains how to use the `AF_XDP Device Plugin for Kubernetes`_ with +a DPDK application using the :doc:`../nics/af_xdp`. + +.. _AF_XDP Device Plugin for Kubernetes: https://github.com/intel/afxdp-plugins-for-kubernetes + +Background +---------- + +The standard :doc:`../nics/af_xdp` initialization process involves loading an eBPF program +onto the kernel netdev to be used by the PMD. +This operation requires root or escalated Linux privileges +and thus prevents the PMD from working in an unprivileged container. +The AF_XDP Device Plugin handles this situation +by managing the eBPF program(s) on behalf of the Pod, outside of the pod context. + +At a technical level the AF_XDP Device Plugin opens a Unix Domain Socket (UDS) and listens for a client +to make requests over that socket. +A DPDK application acting as a client connects and initiates a configuration "handshake". +After some validation on the Device Plugin side, the client receives a file descriptor which points to the XSKMAP +associated with the loaded eBPF program. +The XSKMAP is an eBPF map of AF_XDP sockets (XSK). +The client can then proceed with creating an AF_XDP socket +and inserting that socket into the XSKMAP pointed to by the descriptor. + +The EAL vdev argument ``use_cni`` is used to indicate that the user wishes +to run the PMD in unprivileged mode and to receive the XSKMAP file descriptor +from the CNI. +When this flag is set, +the ``XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD`` libbpf flag +should be used when creating the socket +to instruct libbpf not to load the default libbpf program on the netdev. +Instead the loading is handled by the AF_XDP Device Plugin. + +Limitations +----------- + +For DPDK versions <= v23.11 the Unix Domain Socket file path appears in +the pod at "/tmp/afxdp.sock". The handshake implementation in the AF_XDP PMD +is only compatible with the AF_XDP Device Plugin up to commit id `38317c2`_ +and the pod is limited to a single netdev. + +.. note:: + + DPDK AF_XDP PMD <= v23.11 will not work with the latest version of the + AF_XDP Device Plugin. + +The issue is if a single pod requests different devices from different pools it +results in multiple UDS servers serving the pod with the container using only a +single mount point for their UDS as ``/tmp/afxdp.sock``. This means that at best one +device might be able to complete the handshake. This has been fixed in the AF_XDP +Device Plugin so that the mount point in the pods for the UDS appear at +``/tmp/afxdp_dp//afxdp.sock``. Later versions of DPDK fix this hardcoded path +in the PMD alongside the ``use_cni`` parameter. + +.. _38317c2: https://github.com/intel/afxdp-plugins-for-kubernetes/commit/38317c256b5c7dfb39e013a0f76010c2ded03669 + + +Prerequisites +------------- + +Device Plugin and DPDK container prerequisites: + +* Create a DPDK container image. + +* Set up the device plugin and prepare the Pod Spec as described in + the instructions for `AF_XDP Device Plugin for Kubernetes`_. + +* The Docker image should contain the libbpf and libxdp libraries, + which are dependencies for AF_XDP, + and should include support for the ``ethtool`` command. + +* The Pod should have enabled the capabilities ``CAP_NET_RAW`` for + AF_XDP socket creation, ``IPC_LOCK`` for umem creation and + ``CAP_BPF`` (for Kernel < 5.19) along with support for hugepages. + + .. note:: + + For Kernel versions < 5.19, all BPF sys calls required CAP_BPF, to access maps shared + between the eBFP program and the userspace program. Kernels >= 5.19, only requires CAP_BPF + for map creation (BPF_MAP_CREATE) and loading programs (BPF_PROG_LOAD). + +* Increase locked memory limit so containers have enough memory for packet buffers. + For example: + + .. code-block:: console + + cat << EOF | sudo tee /etc/systemd/system/containerd.service.d/limits.conf + [Service] + LimitMEMLOCK=infinity + EOF + +* dpdk-testpmd application should have AF_XDP feature enabled. + + For further information see the docs for the: :doc:`../../nics/af_xdp`. + + +Example +------- + +Build a DPDK container image (using Docker) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +1. Create a Dockerfile (should be placed in top level DPDK directory): + + .. code-block:: console + + FROM fedora:38 + + # Setup container to build DPDK applications + RUN dnf -y upgrade && dnf -y install \ + libbsd-devel \ + numactl-libs \ + libbpf-devel \ + libbpf \ + meson \ + ninja-build \ + libxdp-devel \ + libxdp \ + numactl-devel \ + python3-pyelftools \ + python38 \ + iproute + RUN dnf groupinstall -y 'Development Tools' + + # Create DPDK dir and copy over sources + # Create DPDK dir and copy over sources + COPY ./ /dpdk + WORKDIR /dpdk + + # Build DPDK + RUN meson setup build + RUN ninja -C build + +2. Build a DPDK container image (using Docker) + + .. code-block:: console + + # docker build -t dpdk -f Dockerfile + +Run dpdk-testpmd with the AF_XDP Device Plugin + CNI +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +* Clone the AF_XDP Device plugin and CNI + + .. code-block:: console + + # git clone https://github.com/intel/afxdp-plugins-for-kubernetes.git + + .. note:: + + Ensure you have the AF_XDP Device Plugin + CNI prerequisites installed. + +* Build the AF_XDP Device plugin and CNI + + .. code-block:: console + + # cd afxdp-plugins-for-kubernetes/ + # make image + +* Make sure to modify the image used by the `daemonset.yml`_ file in the deployments directory with + the following configuration: + + .. _daemonset.yml : https://github.com/intel/afxdp-plugins-for-kubernetes/blob/main/deployments/daemonset.yml + + .. code-block:: yaml + + image: afxdp-device-plugin:latest + + .. note:: + + This will select the AF_XDP DP image that was built locally. Detailed configuration + options can be found in the AF_XDP Device Plugin `readme`_ . + + .. _readme: https://github.com/intel/afxdp-plugins-for-kubernetes#readme + +* Deploy the AF_XDP Device Plugin and CNI + + .. code-block:: console + + # kubectl create -f deployments/daemonset.yml + +* Create the Network Attachment definition + + .. code-block:: console + + # kubectl create -f nad.yaml + + Sample nad.yml + + .. code-block:: yaml + + apiVersion: "k8s.cni.cncf.io/v1" + kind: NetworkAttachmentDefinition + metadata: + name: afxdp-network + annotations: + k8s.v1.cni.cncf.io/resourceName: afxdp/myPool + spec: + config: '{ + "cniVersion": "0.3.0", + "type": "afxdp", + "mode": "primary", + "logFile": "afxdp-cni.log", + "logLevel": "debug", + "ethtoolCmds" : ["-N -device- rx-flow-hash udp4 fn", + "-N -device- flow-type udp4 dst-port 2152 action 22" + ], + "ipam": { + "type": "host-local", + "subnet": "192.168.1.0/24", + "rangeStart": "192.168.1.200", + "rangeEnd": "192.168.1.220", + "routes": [ + { "dst": "0.0.0.0/0" } + ], + "gateway": "192.168.1.1" + } + }' + + For further reference please use the example provided by the AF_XDP DP `nad.yaml`_ + + .. _nad.yaml: https://github.com/intel/afxdp-plugins-for-kubernetes/blob/main/examples/network-attachment-definition.yaml + +* Run the Pod + + .. code-block:: console + + # kubectl create -f pod.yaml + + Sample pod.yaml: + + .. code-block:: yaml + + apiVersion: v1 + kind: Pod + metadata: + name: dpdk + annotations: + k8s.v1.cni.cncf.io/networks: afxdp-network + spec: + containers: + - name: testpmd + image: dpdk:latest + command: ["tail", "-f", "/dev/null"] + securityContext: + capabilities: + add: + - NET_RAW + - IPC_LOCK + resources: + requests: + afxdp/myPool: '1' + limits: + hugepages-1Gi: 2Gi + cpu: 2 + memory: 256Mi + afxdp/myPool: '1' + volumeMounts: + - name: hugepages + mountPath: /dev/hugepages + volumes: + - name: hugepages + emptyDir: + medium: HugePages + + For further reference please use the `pod.yaml`_ + + .. _pod.yaml: https://github.com/intel/afxdp-plugins-for-kubernetes/blob/main/examples/pod-spec.yaml + +* Run DPDK with a command like the following: + + .. code-block:: console + + kubectl exec -i --container -- \ + //dpdk-testpmd -l 0,1 --no-pci \ + --vdev=net_af_xdp0,use_cni=1,iface= \ + --no-mlockall --in-memory \ + -- -i --a --nb-cores=2 --rxq=1 --txq=1 --forward-mode=macswap; diff --git a/doc/guides/howto/index.rst b/doc/guides/howto/index.rst index 71a3381c36..a7692e8a97 100644 --- a/doc/guides/howto/index.rst +++ b/doc/guides/howto/index.rst @@ -8,7 +8,7 @@ HowTo Guides :maxdepth: 2 :numbered: - af_xdp_cni + af_xdp_dp lm_bond_virtio_sriov lm_virtio_vhost_user flow_bifurcation diff --git a/doc/guides/nics/af_xdp.rst b/doc/guides/nics/af_xdp.rst index 1932525d4d..4dd9c73742 100644 --- a/doc/guides/nics/af_xdp.rst +++ b/doc/guides/nics/af_xdp.rst @@ -155,9 +155,9 @@ use_cni ~~~~~~~ The EAL vdev argument ``use_cni`` is used to indicate that the user wishes to -enable the `AF_XDP Plugin for Kubernetes`_ within a DPDK application. +enable the `AF_XDP Device Plugin for Kubernetes`_ with a DPDK application/pod. -.. _AF_XDP Plugin for Kubernetes: https://github.com/intel/afxdp-plugins-for-kubernetes +.. _AF_XDP Device Plugin for Kubernetes: https://github.com/intel/afxdp-plugins-for-kubernetes .. code-block:: console -- 2.41.0