RE: [v6] net/af_xdp: enable uds_path instead of use_cni

["Koikkara Reeny, Shibin" <shibin.koikkara.reeny@intel.com>]

Thank you Maryam for the changes. 
We can merge the patch.

Regards,
Shibin

> -----Original Message-----
> From: Maryam Tahhan <mtahhan@redhat.com>
> Sent: Friday, December 15, 2023 3:40 PM
> To: ferruh.yigit@amd.com; stephen@networkplumber.org;
> lihuisong@huawei.com; fengchengwen@huawei.com;
> liuyonglong@huawei.com; Koikkara Reeny, Shibin
> <shibin.koikkara.reeny@intel.com>; Loftus, Ciara <ciara.loftus@intel.com>
> Cc: dev@dpdk.org; Tahhan, Maryam <mtahhan@redhat.com>
> Subject: [v6] net/af_xdp: enable uds_path instead of use_cni
> 
> With the original 'use_cni' implementation, (using a hardcoded socket rather
> than a configurable one), if a DPDK pod is requesting multiple net devices
> and these devices are from different pools, then the container attempts to
> mount all the netdev UDSes in the pod as /tmp/afxdp.sock. Which means
> that at best only 1 netdev will handshake correctly with the AF_XDP DP. This
> patch addresses this by making the socket parameter configurable using a
> new vdev param called 'uds_path' and removing the previous 'use_cni'
> param.
> This patch also fixes incorrect references to the AF_XDP DP as CNI and
> updates the documentation with a working example. This change has been
> tested with the AF_XDP DP PR 81[1], with both single and multiple interfaces.
> 
> [1] https://github.com/intel/afxdp-plugins-for-kubernetes/pull/81
> 
> v6:
> * Add link to PR 81 in commit message
> * Add release notes changes to this patchset
> 
> v5:
> * Fix alignment for ETH_AF_XDP_USE_DP_UDS_PATH_ARG
> * Remove use_cni references in af_xdp.rst
> 
> v4:
> * Rename af_xdp_cni.rst to af_xdp_dp.rst
> * Removed all incorrect references to CNI throughout af_xdp
>   PMD file.
> * Fixed Typos in af_xdp_dp.rst
> 
> v3:
> * Remove `use_cni` vdev argument as it's no longer needed.
> * Update incorrect CNI references for the AF_XDP DP in the
>   documentation.
> * Update the documentation to run a simple example with the
>   AF_XDP DP plugin in K8s.
> 
> v2:
> * Rename sock_path to uds_path.
> * Update documentation to reflect when CAP_BPF is needed.
> * Fix testpmd arguments in the provided example for Pods.
> * Use AF_XDP API to update the xskmap entry.
> 
> Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>
> Reviewed-by: Ciara Loftus <ciara.loftus@intel.com>
> ---
>  doc/guides/howto/af_xdp_cni.rst        | 253 ----------------------
>  doc/guides/howto/af_xdp_dp.rst         | 278
> +++++++++++++++++++++++++
>  doc/guides/howto/index.rst             |   2 +-
>  doc/guides/nics/af_xdp.rst             |  27 ++-
>  doc/guides/rel_notes/release_24_03.rst |   7 +
>  drivers/net/af_xdp/rte_eth_af_xdp.c    | 100 +++++----
>  6 files changed, 352 insertions(+), 315 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<version>.tar.gz /tmp
> -     RUN cd /tmp && tar -xvmf libbpf<version>.tar.gz && cd libbpf/src &&
> make install
> -     COPY ./libxdp<version>.tar.gz /tmp
> -     RUN cd /tmp && tar -xvmf libxdp<version>.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 <Pod name> --container <containers name> -- \
> -           /<Path>/dpdk-testpmd -l 0,1 --no-pci \
> -           --vdev=net_af_xdp0,use_cni=1,iface=<interface name> \
> -           -- --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..7717d59224
> --- /dev/null
> +++ b/doc/guides/howto/af_xdp_dp.rst
> @@ -0,0 +1,278 @@
> +.. SPDX-License-Identifier: BSD-3-Clause
> +   Copyright(c) 2023 Intel Corporation.
> +
> +Using the AF_XDP Device Plugin with the AF_XDP driver
> +======================================================
> +
> +Introduction
> +------------
> +
> +The `AF_XDP Device Plugin for Kubernetes`_ is a project that provisions
> +and advertises interfaces (that can be used with AF_XDP) to Kubernetes.
> +The project also includes a `CNI`_.
> +
> +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 use the `AF_XDP Device Plugin for
> +Kubernetes`_ with a DPDK :doc:`../nics/af_xdp` based application running in
> a Pod.
> +
> +.. _AF_XDP Device Plugin for Kubernetes:
> +https://github.com/intel/afxdp-plugins-for-kubernetes
> +.. _CNI: https://github.com/containernetworking/cni
> +
> +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 prevents
> +the PMD from working in an unprivileged container. The AF_XDP Device
> +Plugin (DP) addresses this situation by providing an entity that
> +manages eBPF program lifecycle for Pod interfaces that wish to use
> +AF_XDP, this in turn allows the pod to be used without privilege escalation.
> +
> +In order for the pod to run without privilege escalation, the AF_XDP DP
> +creates a Unix Domain Socket (UDS) and listens for Pods to make
> +requests for XSKMAP(s) File Descriptors (FDs) for interfaces in their
> network namespace.
> +In other words, the DPDK application running in the Pod connects to
> +this UDS and initiates a "handshake" to retrieve the XSKMAP(s) FD(s).
> +Upon a successful "handshake", the DPDK application receives the FD(s)
> +for the XSKMAP(s) associated with the relevant netdevs. The DPDK
> +application can then create the AF_XDP socket(s), and attach the socket(s)
> to the netdev queue(s) by inserting the socket(s) into the XSKMAP(s).
> +
> +The EAL vdev argument ``uds_path`` is used to indicate that the user
> +wishes to run the AF_XDP PMD in unprivileged mode and to receive the
> +XSKMAP FD from the AF_XDP DP. When this param is used, the
> +``XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD`` libbpf flag is used when
> +creating the AF_XDP socket to instruct libbpf/libxdp not to load the
> +default eBPF redirect program for AF_XDP on the netdev. Instead the
> +lifecycle management of the eBPF program is handled by the AF_XDP DP.
> +
> +.. note::
> +
> +   The UDS file path inside the pod appears at
> "/tmp/afxdp_dp/<netdev>/afxdp.sock".
> +
> +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`_.
> +
> +* 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
> +-------
> +
> +How to run dpdk-testpmd with the AF_XDP Device plugin:
> +
> +* Clone the AF_XDP Device plugin
> +
> +  .. code-block:: console
> +
> +     # git clone
> + https://github.com/intel/afxdp-plugins-for-kubernetes.git
> +
> +* Build the AF_XDP Device plugin and the 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/deploy
> + ments/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 a Network Attachment Definition (NAD)
> +
> +  .. 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/exampl
> + es/network-attachment-definition.yaml
> +
> +* Build a DPDK container image (using Docker)
> +
> +  .. code-block:: console
> +
> +    # docker build -t dpdk -f Dockerfile .
> +
> +  Sample 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
> +    WORKDIR /dpdk
> +    COPY app app
> +    COPY builddir  builddir
> +    COPY buildtools buildtools
> +    COPY config config
> +    COPY devtools devtools
> +    COPY drivers drivers
> +    COPY dts dts
> +    COPY examples examples
> +    COPY kernel kernel
> +    COPY lib lib
> +    COPY license license
> +    COPY MAINTAINERS MAINTAINERS
> +    COPY Makefile Makefile
> +    COPY meson.build meson.build
> +    COPY meson_options.txt meson_options.txt
> +    COPY usertools usertools
> +    COPY VERSION VERSION
> +    COPY ABI_VERSION ABI_VERSION
> +    COPY doc doc
> +
> +    # Build DPDK
> +    RUN meson setup build
> +    RUN ninja -C build
> +
> +  .. note::
> +
> +    Ensure the Dockerfile is placed in the top level DPDK directory.
> +
> +* 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/exampl
> + es/pod-spec.yaml
> +
> +.. note::
> +
> +   For Kernel versions older than 5.19 `CAP_BPF` is also required in
> +   the container capabilities stanza.
> +
> +* Run DPDK with a command like the following:
> +
> +  .. code-block:: console
> +
> +     kubectl exec -i dpdk --container testpmd -- \
> +           ./build/app/dpdk-testpmd -l 0-2 --no-pci --main-lcore=2 \
> +           --vdev net_af_xdp,iface=<interface
> name>,start_queue=22,queue_count=1,uds_path=/tmp/afxdp_dp/<interfa
> ce-name>/afxdp.sock \
> +           -- -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..0edc84328d 100644
> --- a/doc/guides/nics/af_xdp.rst
> +++ b/doc/guides/nics/af_xdp.rst
> @@ -151,25 +151,32 @@ instead of zero copy mode (if available).
> 
>      --vdev net_af_xdp,iface=ens786f1,force_copy=1
> 
> -use_cni
> -~~~~~~~
> +uds_path
> +~~~~~~~~~
> 
> -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.
> +The EAL vdev argument ``uds_path`` is used to indicate that the user
> +wishes to use the `AF_XDP Plugin for Kubernetes`_ with a DPDK application
> running in a Pod.
> 
>  .. _AF_XDP Plugin for Kubernetes: https://github.com/intel/afxdp-plugins-
> for-kubernetes
> 
>  .. code-block:: console
> 
> -   --vdev=net_af_xdp0,use_cni=1
> +
> + --vdev=net_af_xdp0,uds_path==/tmp/afxdp_dp/<interface-
> name>/afxdp.sock
> 
>  .. note::
> 
> -   When using `use_cni`_, both parameters `xdp_prog`_ and `busy_budget`_
> are disabled
> -   as both of these will be handled by the AF_XDP plugin.
> -   Since the DPDK application is running in limited privileges
> -   so enabling and disabling of the promiscuous mode through the DPDK
> application
> -   is also not supported.
> +   The UDS ``afxdp.sock`` is available in the DPDK container through a
> +   volume mounted by the `AF_XDP Plugin for Kubernetes`_ at the path
> +   specified in the example above.
> +
> +.. note::
> +
> +   When using `uds_path`_, both parameters `xdp_prog`_ and
> `busy_budget`_ are disabled
> +   as both of these will be handled by the AF_XDP Device plugin (if required).
> +   Since the pod/container is running with limited privileges enabling and
> disabling
> +   of promiscuous mode through the DPDK application is also not supported.
> +
> +For more details please see: :doc:`../howto/af_xdp_dp`
> 
>  Limitations
>  -----------
> diff --git a/doc/guides/rel_notes/release_24_03.rst
> b/doc/guides/rel_notes/release_24_03.rst
> index 6f8ad27808..606cdf6316 100644
> --- a/doc/guides/rel_notes/release_24_03.rst
> +++ b/doc/guides/rel_notes/release_24_03.rst
> @@ -55,6 +55,13 @@ New Features
>       Also, make sure to start the actual text at the margin.
>       =======================================================
> 
> +* **Integration of AF_XDP PMD with AF_XDP Device Plugin**
> +
> +  The EAL vdev argument for the AF_XDP PMD ``uds_path`` was added  to
> + allow Kubernetes Pods that which to use AF_XDP with DPDK to run  with
> + limited privileges. This flag indicates that the AF_XDP PMD  will be
> + used in unprivileged mode and will receive the XSKMAP FD from  the
> + AF_XDP Device Plugin.
> 
>  Removed Items
>  -------------
> diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c
> b/drivers/net/af_xdp/rte_eth_af_xdp.c
> index 353c8688ec..db6724b9e5 100644
> --- a/drivers/net/af_xdp/rte_eth_af_xdp.c
> +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
> @@ -88,7 +88,6 @@ RTE_LOG_REGISTER_DEFAULT(af_xdp_logtype,
> NOTICE);
>  #define UDS_MAX_CMD_LEN			64
>  #define UDS_MAX_CMD_RESP		128
>  #define UDS_XSK_MAP_FD_MSG		"/xsk_map_fd"
> -#define UDS_SOCK			"/tmp/afxdp.sock"
>  #define UDS_CONNECT_MSG			"/connect"
>  #define UDS_HOST_OK_MSG			"/host_ok"
>  #define UDS_HOST_NAK_MSG		"/host_nak"
> @@ -170,7 +169,7 @@ struct pmd_internals {
>  	char prog_path[PATH_MAX];
>  	bool custom_prog_configured;
>  	bool force_copy;
> -	bool use_cni;
> +	char uds_path[PATH_MAX];
>  	struct bpf_map *map;
> 
>  	struct rte_ether_addr eth_addr;
> @@ -190,7 +189,7 @@ struct pmd_process_private {
>  #define ETH_AF_XDP_PROG_ARG			"xdp_prog"
>  #define ETH_AF_XDP_BUDGET_ARG			"busy_budget"
>  #define ETH_AF_XDP_FORCE_COPY_ARG		"force_copy"
> -#define ETH_AF_XDP_USE_CNI_ARG			"use_cni"
> +#define ETH_AF_XDP_USE_DP_UDS_PATH_ARG		"uds_path"
> 
>  static const char * const valid_arguments[] = {
>  	ETH_AF_XDP_IFACE_ARG,
> @@ -200,7 +199,7 @@ static const char * const valid_arguments[] = {
>  	ETH_AF_XDP_PROG_ARG,
>  	ETH_AF_XDP_BUDGET_ARG,
>  	ETH_AF_XDP_FORCE_COPY_ARG,
> -	ETH_AF_XDP_USE_CNI_ARG,
> +	ETH_AF_XDP_USE_DP_UDS_PATH_ARG,
>  	NULL
>  };
> 
> @@ -1351,7 +1350,7 @@ configure_preferred_busy_poll(struct
> pkt_rx_queue *rxq)  }
> 
>  static int
> -init_uds_sock(struct sockaddr_un *server)
> +init_uds_sock(struct sockaddr_un *server, const char *uds_path)
>  {
>  	int sock;
> 
> @@ -1362,7 +1361,7 @@ init_uds_sock(struct sockaddr_un *server)
>  	}
> 
>  	server->sun_family = AF_UNIX;
> -	strlcpy(server->sun_path, UDS_SOCK, sizeof(server->sun_path));
> +	strlcpy(server->sun_path, uds_path, sizeof(server->sun_path));
> 
>  	if (connect(sock, (struct sockaddr *)server, sizeof(struct
> sockaddr_un)) < 0) {
>  		close(sock);
> @@ -1382,7 +1381,7 @@ struct msg_internal {  };
> 
>  static int
> -send_msg(int sock, char *request, int *fd)
> +send_msg(int sock, char *request, int *fd, const char *uds_path)
>  {
>  	int snd;
>  	struct iovec iov;
> @@ -1393,7 +1392,7 @@ send_msg(int sock, char *request, int *fd)
> 
>  	memset(&dst, 0, sizeof(dst));
>  	dst.sun_family = AF_UNIX;
> -	strlcpy(dst.sun_path, UDS_SOCK, sizeof(dst.sun_path));
> +	strlcpy(dst.sun_path, uds_path, sizeof(dst.sun_path));
> 
>  	/* Initialize message header structure */
>  	memset(&msgh, 0, sizeof(msgh));
> @@ -1470,8 +1469,8 @@ read_msg(int sock, char *response, struct
> sockaddr_un *s, int *fd)  }
> 
>  static int
> -make_request_cni(int sock, struct sockaddr_un *server, char *request,
> -		 int *req_fd, char *response, int *out_fd)
> +make_request_dp(int sock, struct sockaddr_un *server, char *request,
> +		 int *req_fd, char *response, int *out_fd, const char
> *uds_path)
>  {
>  	int rval;
> 
> @@ -1483,7 +1482,7 @@ make_request_cni(int sock, struct sockaddr_un
> *server, char *request,
>  	if (req_fd == NULL)
>  		rval = write(sock, request, strlen(request));
>  	else
> -		rval = send_msg(sock, request, req_fd);
> +		rval = send_msg(sock, request, req_fd, uds_path);
> 
>  	if (rval < 0) {
>  		AF_XDP_LOG(ERR, "Write error %s\n", strerror(errno)); @@
> -1507,7 +1506,7 @@ check_response(char *response, char *exp_resp, long
> size)  }
> 
>  static int
> -get_cni_fd(char *if_name)
> +get_xskmap_fd(char *if_name, const char *uds_path)
>  {
>  	char request[UDS_MAX_CMD_LEN],
> response[UDS_MAX_CMD_RESP];
>  	char hostname[MAX_LONG_OPT_SZ],
> exp_resp[UDS_MAX_CMD_RESP]; @@ -1520,14 +1519,14 @@
> get_cni_fd(char *if_name)
>  		return -1;
> 
>  	memset(&server, 0, sizeof(server));
> -	sock = init_uds_sock(&server);
> +	sock = init_uds_sock(&server, uds_path);
>  	if (sock < 0)
>  		return -1;
> 
> -	/* Initiates handshake to CNI send: /connect,hostname */
> +	/* Initiates handshake to AF_XDP Device Plugin send:
> /connect,hostname
> +*/
>  	snprintf(request, sizeof(request), "%s,%s", UDS_CONNECT_MSG,
> hostname);
>  	memset(response, 0, sizeof(response));
> -	if (make_request_cni(sock, &server, request, NULL, response,
> &out_fd) < 0) {
> +	if (make_request_dp(sock, &server, request, NULL, response,
> &out_fd,
> +uds_path) < 0) {
>  		AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
> request);
>  		goto err_close;
>  	}
> @@ -1541,7 +1540,7 @@ get_cni_fd(char *if_name)
>  	/* Request for "/version" */
>  	strlcpy(request, UDS_VERSION_MSG, UDS_MAX_CMD_LEN);
>  	memset(response, 0, sizeof(response));
> -	if (make_request_cni(sock, &server, request, NULL, response,
> &out_fd) < 0) {
> +	if (make_request_dp(sock, &server, request, NULL, response,
> &out_fd,
> +uds_path) < 0) {
>  		AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
> request);
>  		goto err_close;
>  	}
> @@ -1549,7 +1548,7 @@ get_cni_fd(char *if_name)
>  	/* Request for file descriptor for netdev name*/
>  	snprintf(request, sizeof(request), "%s,%s",
> UDS_XSK_MAP_FD_MSG, if_name);
>  	memset(response, 0, sizeof(response));
> -	if (make_request_cni(sock, &server, request, NULL, response,
> &out_fd) < 0) {
> +	if (make_request_dp(sock, &server, request, NULL, response,
> &out_fd,
> +uds_path) < 0) {
>  		AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
> request);
>  		goto err_close;
>  	}
> @@ -1571,7 +1570,7 @@ get_cni_fd(char *if_name)
>  	/* Initiate close connection */
>  	strlcpy(request, UDS_FIN_MSG, UDS_MAX_CMD_LEN);
>  	memset(response, 0, sizeof(response));
> -	if (make_request_cni(sock, &server, request, NULL, response,
> &out_fd) < 0) {
> +	if (make_request_dp(sock, &server, request, NULL, response,
> &out_fd,
> +uds_path) < 0) {
>  		AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
> request);
>  		goto err_close;
>  	}
> @@ -1640,7 +1639,7 @@ xsk_configure(struct pmd_internals *internals,
> struct pkt_rx_queue *rxq,  #endif
> 
>  	/* Disable libbpf from loading XDP program */
> -	if (internals->use_cni)
> +	if (strnlen(internals->uds_path, PATH_MAX))
>  		cfg.libbpf_flags |=
> XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD;
> 
>  	if (strnlen(internals->prog_path, PATH_MAX)) { @@ -1694,18
> +1693,17 @@ xsk_configure(struct pmd_internals *internals, struct
> pkt_rx_queue *rxq,
>  		}
>  	}
> 
> -	if (internals->use_cni) {
> -		int err, fd, map_fd;
> +	if (strnlen(internals->uds_path, PATH_MAX)) {
> +		int err, map_fd;
> 
> -		/* get socket fd from CNI plugin */
> -		map_fd = get_cni_fd(internals->if_name);
> +		/* get socket fd from AF_XDP Device plugin */
> +		map_fd = get_xskmap_fd(internals->if_name, internals-
> >uds_path);
>  		if (map_fd < 0) {
> -			AF_XDP_LOG(ERR, "Failed to receive CNI plugin
> fd\n");
> +			AF_XDP_LOG(ERR, "Failed to receive AF_XDP Device
> plugin fd\n");
>  			goto out_xsk;
>  		}
> -		/* get socket fd */
> -		fd = xsk_socket__fd(rxq->xsk);
> -		err = bpf_map_update_elem(map_fd, &rxq-
> >xsk_queue_idx, &fd, 0);
> +
> +		err = xsk_socket__update_xskmap(rxq->xsk, map_fd);
>  		if (err) {
>  			AF_XDP_LOG(ERR, "Failed to insert unprivileged xsk
> in map.\n");
>  			goto out_xsk;
> @@ -1881,13 +1879,13 @@ static const struct eth_dev_ops ops = {
>  	.get_monitor_addr = eth_get_monitor_addr,  };
> 
> -/* CNI option works in unprivileged container environment
> - * and ethernet device functionality will be reduced. So
> - * additional customiszed eth_dev_ops struct is needed
> - * for cni. Promiscuous enable and disable functionality
> - * is removed.
> - **/
> -static const struct eth_dev_ops ops_cni = {
> +/* AF_XDP Device Plugin option works in unprivileged
> + * container environment and ethernet device functionality
> + * will be reduced. So additional customized eth_dev_ops
> + * struct is needed for the AF_XDP Device Plugin. Promiscuous
> + * enable and disable functionality is removed.
> + */
> +static const struct eth_dev_ops ops_afxdp_dp = {
>  	.dev_start = eth_dev_start,
>  	.dev_stop = eth_dev_stop,
>  	.dev_close = eth_dev_close,
> @@ -1957,7 +1955,7 @@ parse_name_arg(const char *key __rte_unused,
> 
>  /** parse xdp prog argument */
>  static int
> -parse_prog_arg(const char *key __rte_unused,
> +parse_path_arg(const char *key __rte_unused,
>  	       const char *value, void *extra_args)  {
>  	char *path = extra_args;
> @@ -2023,7 +2021,7 @@ xdp_get_channels_info(const char *if_name, int
> *max_queues,  static int  parse_parameters(struct rte_kvargs *kvlist, char
> *if_name, int *start_queue,
>  		 int *queue_cnt, int *shared_umem, char *prog_path,
> -		 int *busy_budget, int *force_copy, int *use_cni)
> +		 int *busy_budget, int *force_copy, char *uds_path)
>  {
>  	int ret;
> 
> @@ -2050,7 +2048,7 @@ parse_parameters(struct rte_kvargs *kvlist, char
> *if_name, int *start_queue,
>  		goto free_kvlist;
> 
>  	ret = rte_kvargs_process(kvlist, ETH_AF_XDP_PROG_ARG,
> -				 &parse_prog_arg, prog_path);
> +				 &parse_path_arg, prog_path);
>  	if (ret < 0)
>  		goto free_kvlist;
> 
> @@ -2064,8 +2062,8 @@ parse_parameters(struct rte_kvargs *kvlist, char
> *if_name, int *start_queue,
>  	if (ret < 0)
>  		goto free_kvlist;
> 
> -	ret = rte_kvargs_process(kvlist, ETH_AF_XDP_USE_CNI_ARG,
> -				 &parse_integer_arg, use_cni);
> +	ret = rte_kvargs_process(kvlist,
> ETH_AF_XDP_USE_DP_UDS_PATH_ARG,
> +				 &parse_path_arg, uds_path);
>  	if (ret < 0)
>  		goto free_kvlist;
> 
> @@ -2108,7 +2106,7 @@ static struct rte_eth_dev *  init_internals(struct
> rte_vdev_device *dev, const char *if_name,
>  	       int start_queue_idx, int queue_cnt, int shared_umem,
>  	       const char *prog_path, int busy_budget, int force_copy,
> -	       int use_cni)
> +		   const char *uds_path)
>  {
>  	const char *name = rte_vdev_device_name(dev);
>  	const unsigned int numa_node = dev->device.numa_node; @@ -
> 2137,7 +2135,7 @@ init_internals(struct rte_vdev_device *dev, const char
> *if_name,  #endif
>  	internals->shared_umem = shared_umem;
>  	internals->force_copy = force_copy;
> -	internals->use_cni = use_cni;
> +	strlcpy(internals->uds_path, uds_path, PATH_MAX);
> 
>  	if (xdp_get_channels_info(if_name, &internals->max_queue_cnt,
>  				  &internals->combined_queue_cnt)) { @@ -
> 2196,10 +2194,10 @@ init_internals(struct rte_vdev_device *dev, const char
> *if_name,
>  	eth_dev->data->dev_link = pmd_link;
>  	eth_dev->data->mac_addrs = &internals->eth_addr;
>  	eth_dev->data->dev_flags |=
> RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
> -	if (!internals->use_cni)
> +	if (!strnlen(internals->uds_path, PATH_MAX))
>  		eth_dev->dev_ops = &ops;
>  	else
> -		eth_dev->dev_ops = &ops_cni;
> +		eth_dev->dev_ops = &ops_afxdp_dp;
> 
>  	eth_dev->rx_pkt_burst = eth_af_xdp_rx;
>  	eth_dev->tx_pkt_burst = eth_af_xdp_tx; @@ -2327,7 +2325,7 @@
> rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
>  	char prog_path[PATH_MAX] = {'\0'};
>  	int busy_budget = -1, ret;
>  	int force_copy = 0;
> -	int use_cni = 0;
> +	char uds_path[PATH_MAX] = {'\0'};
>  	struct rte_eth_dev *eth_dev = NULL;
>  	const char *name = rte_vdev_device_name(dev);
> 
> @@ -2370,20 +2368,20 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device
> *dev)
> 
>  	if (parse_parameters(kvlist, if_name, &xsk_start_queue_idx,
>  			     &xsk_queue_cnt, &shared_umem, prog_path,
> -			     &busy_budget, &force_copy, &use_cni) < 0) {
> +				 &busy_budget, &force_copy, uds_path) < 0)
> {
>  		AF_XDP_LOG(ERR, "Invalid kvargs value\n");
>  		return -EINVAL;
>  	}
> 
> -	if (use_cni && busy_budget > 0) {
> +	if (strnlen(uds_path, PATH_MAX) && busy_budget > 0) {
>  		AF_XDP_LOG(ERR, "When '%s' parameter is used, '%s'
> parameter is not valid\n",
> -			ETH_AF_XDP_USE_CNI_ARG,
> ETH_AF_XDP_BUDGET_ARG);
> +			ETH_AF_XDP_USE_DP_UDS_PATH_ARG,
> ETH_AF_XDP_BUDGET_ARG);
>  		return -EINVAL;
>  	}
> 
> -	if (use_cni && strnlen(prog_path, PATH_MAX)) {
> +	if (strnlen(uds_path, PATH_MAX) && strnlen(prog_path,
> PATH_MAX)) {
>  		AF_XDP_LOG(ERR, "When '%s' parameter is used, '%s'
> parameter is not valid\n",
> -			ETH_AF_XDP_USE_CNI_ARG,
> ETH_AF_XDP_PROG_ARG);
> +			ETH_AF_XDP_USE_DP_UDS_PATH_ARG,
> ETH_AF_XDP_PROG_ARG);
>  			return -EINVAL;
>  	}
> 
> @@ -2410,7 +2408,7 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device
> *dev)
> 
>  	eth_dev = init_internals(dev, if_name, xsk_start_queue_idx,
>  				 xsk_queue_cnt, shared_umem, prog_path,
> -				 busy_budget, force_copy, use_cni);
> +				 busy_budget, force_copy, uds_path);
>  	if (eth_dev == NULL) {
>  		AF_XDP_LOG(ERR, "Failed to init internals\n");
>  		return -1;
> @@ -2471,4 +2469,4 @@
> RTE_PMD_REGISTER_PARAM_STRING(net_af_xdp,
>  			      "xdp_prog=<string> "
>  			      "busy_budget=<int> "
>  			      "force_copy=<int> "
> -			      "use_cni=<int> ");
> +			      "uds_path=<string> ");
> --
> 2.41.0