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 14:26:31
Last Modify:2022-05-23 09:15:29 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：bpf_percpu_hash_copy

函数原型：int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value)

返回类型：int

参数：

类型参数名称
struct bpf_map *map
void *key
void *value
1286  __percpu乘pptr
1287  ret等于负ENOENT
1288  off等于0
1295  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)
1296  _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
1297  l等于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().
1298  如果非l则转到:out
1303  pptr等于htab_elem_get_ptr(l, key_size)
1304  遍历可用CPU(cpu)
1305  bpf_long_memcpy(value + off, per_cpu_ptr(pptr, cpu), size)
1307  off加等于size
1309  ret等于0
1310  out :
1311  _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()
1312  返回:ret
调用者
名称描述
map_lookup_elem