vpp与dpdk的关系

dpdk作为vpp的一个插件，主要用来从网卡收发包。

vpp使用如下命令参数初始化dpdk eal。

EAL init args: -c a -n 1 --in-memory --huge-dir /mnt/hugepages --no-pci --proc-type primary --file-prefix vpp --master-lcore 1

dpdk初始化流程

读取配置

dpdk_config

初始化库

dpdk_lib_init

注册节点

输入节点

dpdk_device_inpu

输出节点
- 接口tx function的赋值
```
VNET_DEVICE_CLASS_TX_FN (dpdk_device_class)
```
- 接口output node和tx node的初始化

网口操作

/* A class of hardware interface devices. */
/* 一类硬件接口的操作函数集合，这些函数是在硬件设备的驱动上封装的一层 */
typedef struct _vnet_device_class
{/* Index into main vector.类索引 */u32 index;/* Device name (e.g. "FOOBAR 1234a").设备类名字 */char *name;/* Function to call when hardware interface is added/deleted. *//* 添加/删除一个该类设备的实例函数 */vnet_interface_function_t *interface_add_del_function;/* Function to bring device administratively up/down. *//* 设备UP/DOWN操作函数 */vnet_interface_function_t *admin_up_down_function;/* Function to call when sub-interface is added/deleted *//* 以该类型设备为主设备，添加/删除一个子接口的函数 */vnet_subif_add_del_function_t *subif_add_del_function;/* Function to call interface rx mode is changed *//* 接收模式变化函数 */vnet_interface_set_rx_mode_function_t *rx_mode_change_function;/* Function to call interface l2 mode is changed *//* 接口的二层模式变化操作函数 */vnet_interface_set_l2_mode_function_t *set_l2_mode_function;/* Redistribute flag changes/existence of this interface class. */u32 redistribute;/* Transmit function. *//* 发送函数 */vlib_node_function_t *tx_function;/* Transmit function candidate registration with priority *//* 注册的多个候选的发送函数，最终根据优先级选择一个最高的赋值给tx_function */vlib_node_fn_registration_t *tx_fn_registrations;/* Error strings indexed by error code for this node. *//* 发送函数错误原因字符数组 */char **tx_function_error_strings;/* Number of error codes used by this node. *//* tx_function_error_strings数组大小 */u32 tx_function_n_errors;/* Renumber device name [only!] support, a control-plane kludge */int (*name_renumber) (struct vnet_hw_interface_t * hi,u32 new_dev_instance);/* Interface flow offload operations *//* 流量卸载功能操作函数集合 */                      vnet_flow_dev_ops_function_t *flow_ops_function;/* Format device instance as name. */format_function_t *format_device_name;/* Parse function for device name. */unformat_function_t *unformat_device_name;/* Format device verbosely for this class. */format_function_t *format_device;/* Trace buffer format for TX function. */format_function_t *format_tx_trace;/* Format flow offload entry */format_function_t *format_flow;/* Function to clear hardware counters for device. *//* 清除统计函数 */void (*clear_counters) (u32 dev_class_instance);uword (*is_valid_class_for_interface) (struct vnet_main_t * vnm,u32 hw_if_index,u32 hw_class_index);/* Called when hardware class of an interface changes. */void (*hw_class_change) (struct vnet_main_t * vnm,u32 hw_if_index, u32 new_hw_class_index);/* Called to redirect traffic from a specific interface instance *//* 强制重定向一个接口的流量到指定的node */                         void (*rx_redirect_to_node) (struct vnet_main_t * vnm,u32 hw_if_index, u32 node_index);/* Link-list of all device classes set up by constructors created below *//* 形成链表 */struct _vnet_device_class *next_class_registration;/* Function to set mac address. *//* 链路层地址变化函数 */vnet_interface_set_mac_address_function_t *mac_addr_change_function;
} vnet_device_class_t;

vpp中dpdk内存管理

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dpdk_config

dpdk_buffer_pool_create

dpdk_pool_create

rte_mempool_create_empty

rte_pktmbuf_pool_init

rte_mempool_get_priv

dpdk_lib_init

dpdk_pool_create与rte_pktmbuf_pool_create的区别：

dpdk mempool

mempool基础

Mempool是固定大小的对象分配器。在DPDK中，它由名称唯一标识，并且使用mempool操作来存储空闲对象。Mempool的组织是通过三个部分实现的：

mempool对象节点：mempool的对象挂接在 static struct rte_tailq_elem rte_mempool_tailq 全局队列中，可以通过名字进行唯一标识符；此队列只是mempool的一个对象指示结构，并不是实际的内存区；

mempool实际内存区： struct rte_memzone 是实际分配的连续内存空间，存储所创建的mempool对象；

ring无锁队列：作为一个无锁环形队列 struct rte_ring ，存储着mempool对象的指针，提供了方便存取使用mempool的空间的办法。

mempool的对象通过与ring无锁队列建立关联方便存取；同时，为了减少多核访问造成的冲突，引入了local_cache对象缓冲区。该local_cache非硬件上的cache，而是为了减少多核访问ring造成的临界区访问，coreX app会优先访问该local_cache上的对象。入队的时候优先入local_cache中，出队的时候优先从local_cache中出队。

mempool创建使用

先注意一下 rte_mempool_create 的参数中的两个 mp_init 和 obj_init ，前者负责初始化mempool中配置的私有参数，如在数据包中加入的我们自己的私有结构；后者负责初始化每个mempool对象。我们然后按照mempool的3个关键部分展开说明。

mempool头结构的创建

mempool头结构包含3个部分： struct rte_mempool ， struct rte_mempool_cache 和mempool private。创建是在 rte_mempool_create_empty() 中完成的，先进行了对齐的检查,然后从mempool队列中取出头节点，我们创建的mempool结构填充好，就挂接在这个节点上。接下来做一些检查工作和创建flag的设置.rte_mempool_calc_obj_size() 计算了每个obj的大小，这个obj又是由三个部分组成的，header_size、elt_size、trailer_size，即头，数据区，尾。在没有开启RTE_LIBRTE_MEMPOOL_DEBUG调试时，没有尾部分；头部分的结构为： struct rte_mempool_objhdr ，通过这个头部，mempool中的obj都是链接到队列中的，所以，提供了遍历obj的方式（尽管很少这么用）。函数返回最后计算对齐后的obj的大小，为后面分配空间提供依据。

mempool实际空间的创建

这部分的创建是在函数 rte_mempool_populate_default(struct rte_mempool *mp) 中完成的。

首先计算为这些元素需要分配多大的空间， rte_mempool_ops_calc_mem_size（）

接着 rte_memzone_reserve_aligned（）分配空间。把元素添加到mempool,实际上就是把申请的空间分给每个元素。

ring的创建

转自DPDK-----内存管理之mempool

reference

https://blog.csdn.net/the_dog_tail_grass/article/details/113603311
https://blog.csdn.net/u010827484/article/details/103377792
https://segmentfault.com/a/1190000019400426
https://www.cnblogs.com/rex-2018-cloud/p/10039065.html