函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\local_storage.c Create Date:2022-07-27 14:31:13
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：bpf_percpu_cgroup_storage_update

函数原型：int bpf_percpu_cgroup_storage_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
203  map等于map_to_storage(_map)
204  key等于_key
206  off等于0
209  如果map_flags不等于create new element or update existing 且map_flags不等于update existing element 则返回:负EINVAL
212  _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
213  storage等于cgroup_storage_lookup(map, key, false)
214  如果非storage则
215  _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()
216  返回:负ENOENT
225  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)
226  遍历可用CPU(cpu)
227  bpf_long_memcpy(per_cpu_ptr(percpu_buf, cpu), value + off, size)
229  off加等于size
231  _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()
232  返回:0
调用者
名称描述
map_update_elem