alloc_skb –分配skb,进行基本的初始化; 1staticinlinestructsk_buff *alloc_skb(unsignedintsize,2gfp_t priority)3{4return__alloc_skb(size, priority,0, NUMA_NO_NODE);5} 1/**2* __alloc_skb - allocate a network buffer3* @size: size to allocate4* @gfp_mask: allocation mask5* @flags: ...
LINUX 中 SKB 的分配最终是由函数 : struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,int fclone) 来完成. SKB 可以分为 SKB 描述符与 SKB 数据区两个部分,其中描述符必须从 CACHE 中来分配 : 或者从skbuff_fclone_cache 中分配,或者从 skbuff_head_cache 中来分配. 如果从分配描述符...
`alloc_skb`函数会分配一个大小为`size`的缓冲区,初始化一个`sk_buff`结构体,并返回该结构体的指针。使用该函数分配的缓冲区必须使用`dev_kfree_skb`函数释放。 `alloc_skb`函数主要用于: 1.分配网络数据包缓冲区。 2.初始化`sk_buff`结构体。 3.分配多个缓冲区并链成链表。 常见的使用场景: 1.在网络...
LINUX 中 SKB 的分配最终是由函数 : struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,int fclone) 来完成. SKB 可以分为 SKB 描述符与 SKB 数据区两个部分,其中描述符必须从 CACHE 中来分配 : 或者从skbuff_fclone_cache 中分配,或者从 skbuff_head_cache 中来分配. 如果从分配描述符...
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is trying that &dev->mcu.res_q should not be empty within timeout and than skb_deque. than where is the actual data transfer occur in mt76_connac2_mcu_fill_message - is it correct? the data in skb where we want to download - in RAM or in Hardware? in DMA allocation would the ...
第一部分:netdev_alloc_skb函数概述 1.1函数定义和功能概述 a)函数定义:netdev_alloc_skb(struct net_device *dev, unsigned int length) b)功能:为指定网络设备分配一个大小为length的skb缓冲区,并返回该缓冲区指针。 1.2函数调用示例 示例代码: skb = netdev_alloc_skb(dev, length); if (!skb) { 分配...
netdev_alloc_skb用法 The `netdev_alloc_skb` function is a utility function used in the Linux kernel for allocating a network device buffer. It is commonly used by network device drivers to allocate a new buffer, also known as a socket buffer or `sk_buff`, to store incoming or outgoing...
Even TCP re-transmits are dropped by this, as skb cloning clones the pfmemalloc flag as well. That said, here's the proper page->pfmemalloc propagation onto socket: we must check the huge-page's head page only, other pages' pfmemalloc and mapping values do not contain what is ...
_SKB_PAD #define NET_SKB_PAD 32 #endif /*** *gfp_mask: get_free_pages mask, passed to alloc_skb *alloc_skb()增加32字节的空间,优化读写的效率 ***/ static inline struct sk_buff *__dev_alloc_skb(unsigned int length, gfp_t gfp_mask) { struct sk_buff *skb = alloc_skb(length +...