函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\hashtab.c Create Date:2022-07-27 14:25:22
Last Modify:2022-05-23 09:15:29 Copyright©Brick
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函数名称:Called from syscall or from eBPF program directly, so* arguments have to match bpf_map_lookup_elem() exactly.* The return value is adjusted by BPF instructions* in htab_map_gen_lookup().

函数原型:static void *__htab_map_lookup_elem(struct bpf_map *map, void *key)

返回类型:void

参数:

类型参数名称
struct bpf_map *map
void *key
463  htab等于container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(map, structbpf_htab, map)
469  WARN_ON_ONCE(!_read_lock_held() - might we be in RCU read-side critical section?* If CONFIG_DEBUG_LOCK_ALLOC is selected, returns nonzero iff in an RCU* read-side critical section)
471  key_size等于key_size
473  hash等于htab_map_hash(key, key_size, hashrnd)
475  head等于select_bucket(htab, hash)
477  l等于an be called without bucket lock. it will repeat the loop in* the unlikely event when elements moved from one bucket into another* while link list is being walked
479  返回:l
调用者
名称描述
htab_map_lookup_elem
__htab_lru_map_lookup_elem
htab_percpu_map_lookup_elemCalled from eBPF program
htab_lru_percpu_map_lookup_elem
bpf_percpu_hash_copy
htab_percpu_map_seq_show_elem