Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\arraymap.c Create Date:2022-07-28 13:11:09
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:bpf_percpu_array_copy

Proto:int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value)

Type:int

Parameter:

TypeParameterName
struct bpf_map *map
void *key
void *value
254  array = 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)
255  index = key
256  __percpu * pptr
257  off = 0
260  If Value for the false possibility is greater at compile time(index >= max_entries) Then Return -ENOENT
267  size = 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)
268  _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
269  pptr = pptrs[index & index_mask]
270  for_each_possible_cpu(cpu)
271  bpf_long_memcpy(value + off, per_cpu_ptr(pptr, cpu), size)
272  off += size
274  _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()
275  Return 0
Caller
NameDescribe
map_lookup_elem