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

[Maryam Tahhan <mtahhan@redhat.com>]

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/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 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/examples/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/examples/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/<interface-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