函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\arraymap.c Create Date:2022-07-27 14:27:32
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：bpf_percpu_array_update

函数原型：int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, u64 map_flags)

返回类型：int

参数：

类型参数名称
struct bpf_map *map
void *key
void *value
u64map_flags
338  array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_array, map)
339  index等于key
340  __percpu乘pptr
341  off等于0
344  如果此条件成立可能性小(为编译器优化)(map_flags > update existing element )则返回:负EINVAL
348  如果此条件成立可能性小(为编译器优化)(index >= max_entries)则返回:负E2BIG
352  如果此条件成立可能性小(为编译器优化)(map_flags == create new element if it didn't exist )则返回:负EEXIST
362  size等于und_up - round up to next specified power of 2*@x: the value to round*@y: multiple to round up to (must be a power of 2)* Rounds @x up to next multiple of @y (which must be a power of 2).* To perform arbitrary rounding up, use roundup() below.(value_size, 8)
363  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
364  pptr等于pptrs[index & index_mask]
365  遍历可用CPU(cpu)
366  bpf_long_memcpy(per_cpu_ptr(pptr, cpu), value + off, size)
367  off加等于size
369  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
370  返回:0
调用者
名称描述
map_update_elem