bpf_fd_array_map_lookup_elem

Name:ly called from syscall

Proto:int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value)

Type:int

Parameter:

Type	Parameter	Name
struct bpf_map *	map
void *	key
u32 *	value

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ret = 0

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If Not map_fd_sys_lookup_elem Then Return -Operation is not supported

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_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

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elem = Called from syscall or from eBPF program

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If elem && (ptr = READ_ONCE( * elem)) Then value = map_fd_sys_lookup_elem(ptr)

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Else ret = -ENOENT

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_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()

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Return ret

**Caller**
Name	Describe
map_lookup_elem

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