Ddpk: Add README

Author: Pavel Siska

src/plugins/input/dpdk/README.md

@@ -0,0 +1,88 @@
+# DPDK (input plugin)
+
+DPDK (Data Plane Development Kit) is used for high-performance packet processing. It enables
+direct access to network interfaces, bypassing the kernel, and is suitable for use in environments
+requiring high throughput, low latency, and high packet processing rates.
+
+## Example configuration
+
+```yaml
+input_plugin:
+  dpdk:
+    allowed_nics: "0000:ca:00.0"
+    ### Optional parameters
+    burst_size: 64
+    mempool_size: 8192
+    rx_queues: 8
+    eal_opts: null
+    mtu: 1518
+```
+
+## Parameters
+
+**Mandatory parameters:**
+
+|Parameter | Description |
+|---|---|
+|__allowed_nics__|List of allowed NICs in PCI address format `0000:XX:YY.Z` separated with `,` |
+
+**Optional parameters:**
+|Parameter | Default | Description |
+|---|---|---|
+|__burst_size__   | 64 | Number of packets processed in each burst cycle. Affects batch processing efficiency. |
+|__mempool_size__ | 8192 | Size of the memory pool used for buffering incoming packets. Must be a power of 2.|
+|__rx_queues__    | 1| Number of RX queues per NIC. Increasing this can improve performance on multi-core systems.|
+|__eal_opts__     | null | Extra options to be passed to the DPDK EAL (Environment Abstraction Layer). Can be used for fine-tuning DPDK behavior.|
+|__mtu__          | RTE_ETHER_MAX_LEN (1518) | Maximum Transmission Unit size for the interface. Defines the maximum packet size that can be received.|
+
+# How to use
+
+To use the DPDK input plugin, you must ensure that your system is properly configured for DPDK operation. This includes the following steps:
+
+## 1. Configure the DPDK Driver
+
+TODO MEllanox, broadcom
+
+### 2. Allocate Hugepages
+
+DPDK requires hugepages for optimal performance. Instead of manually configuring hugepages, you can use the `dpdk-hugepages` tool, which simplifies the process.
+
+### Install `dpdk-hugepages`
+
+`dpdk-hugepages` is part of the DPDK utilities package. You can install it as follows:
+
+- **On RHEL/CentOS**:
+  ```sh
+  dnf install dpdk-tools
+  ```
+- **On Debian/Ubuntu**:
+  ```sh
+  apt-get install dpdk
+  ```
+
+### Allocate Hugepages with `dpdk-hugepages`
+
+To allocate hugepages, run:
+
+```sh
+dpdk-hugepages.py -p 1G --setup 2G
+```
+
+This allocates 2GB of hugepages with a default page size of 1GB. You can adjust these values based on your memory requirements.
+
+To verify the allocated hugepages:
+
+```sh
+dpdk-hugepages -s
+```
+
+Recommended hugepages configuration for 100G probe is:
+
+```sh
+dpdk-hugepages.py -p 1G --setup 4G
+```
+
+### 2. Validate with dpdk-testpmd
+
+TODO
+