# XDP架构

XDP基于一系列的技术来实现高性能和可编程性，包括

* 基于eBPF
* Capabilities negotiation：通过协商确定网卡驱动支持的特性，XDP尽量利用新特性，但网卡驱动不需要支持所有的特性
* 在网络协议栈前处理
* 无锁设计
* 批量I/O操作
* 轮询式
* 直接队列访问
* 不需要分配skbuff
* 支持网络卸载
* DDIO
* XDP程序快速执行并结束，没有循环
* Packeting steering

## 包处理逻辑

如下图所示，基于内核的eBPF程序处理包，每个RX队列分配一个CPU，且以每个网络包一个Page（packet-page）的方式避免分配skbuff。

![](/files/-LDZSFQg7DDUv8zuBzFA)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://sdn.feisky.xyz/wang-luo-ji-chu/index-1/index-1/design.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.