bpf_percpu_array_copy

Name:bpf_percpu_array_copy

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

Type:int

Parameter:

Type	Parameter	Name
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

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**
Name	Describe
map_lookup_elem

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