= 1; if (skb_cloned(skb)) { if (skb_orphan_frags(skb, gfp_mask)) goto nofrags; if (skb_zcopy(skb)) refcount_inc(&skb_uarg(skb)->refcnt); for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) skb_frag_ref(skb, i); if (skb_has_frag_list(skb)) skb_clone_fraglist(sk...
*returnskb_shinfo(skb)->frag_list !=NULL;} */ // 一个小优化,frag_list没有就直接从frags开始 if(!skb_has_frag_list(skb)) gotopull_pages; // eat被赋值为传入的delta,而不是上面算出来的需要多少字节 eat= delta; // nr_frags是frags有效的字段数 for(i =0; i < skb_shinfo(skb)->nr_...
1/**2* skb_clone - duplicate an sk_buff3* @skb: buffer to clone4* @gfp_mask: allocation priority5*6* Duplicate an &sk_buff. The new one is not owned by a socket. Both7* copies share the same packet data but not structure. The new8* buffer has a reference count of 1. If t...
skb has frag_list and the device doesn't support FRAGLIST, or skb_warn_if_lro udp_skb_is_linear 源代码转换工具开放的插件接口 X 支持:c/c++/esqlc/java Oracle/Informix/Mysql插件可实现:逻辑报告代码生成和批量转换代码
bool full_pkt) } if (full_pkt && skb_has_frag_list(skb)) { - printk("skb fraglist:\n"); + pr_info("skb fraglist:\n"); skb_walk_frags(skb, list_skb) skb_dump(level, list_skb, true); } -- 1.8.3.1
if (!skb_shinfo(skb)->frag_list) goto pull_pages; // 后面的操作都是在要腾出delta大小的线性缓冲区,腾出空间后就可以拉长skb包页面 /* Estimate size of pulled pages. */ eat = delta; for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { ...
skb_frag_t frags[MAX_SKB_FRAGS]; }; The nr_frags member states how many frags there are active in the frags[] array. The tso_size and tso_segs is used to convey information to the device driver for TCP segmentation offload. The frag_list is used to maintain a chain of SKBs organiz...
第二就是什么时候会使用no-linear,frag_list在处理IP分片时被使用,可以查看内核中的ip_fragment->ip_do_fragment函数,[1][2][3]中对这个部分的描述并不够详细,或者说对frags对描述还不够详细。
I have found that when this occurs, Linux has become fairly unresponsive and simple operations take multiple seconds to complete. I have not been able to characterize it fully since it can be difficult to reproduce. If no one else has experienced this problem then it may be something specific...
if (!skb_shinfo(skb)->frag_list) goto pull_pages; // 后面的操作都是在要腾出delta大小的线性缓冲区,腾出空间后就可以拉长skb包页面 /* Estimate size of pulled pages. */ eat = delta; for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { ...