bpf: Introduce BPF_F_CPU flag for percpu_array map #9180
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To reduce the cached data of updating percpu_array map in light skeleton, introduce BPF_F_CPU flag for updating percpu_array map by reusing one value for all CPUs. The BPF_F_CPU flag places in map_flags of bpf_percpu_array_update() or in batch.elem_flags of generic_map_update_batch() alongside a cpu field. The cpu field indicates updating for all CPUs if 0xFFFFFFFF, or updating for the specified CPU otherwise. Similarly, the BPF_F_CPU flag alongside a cpu field can be used for looking up a value on specified CPU. Signed-off-by: Leon Hwang <[email protected]>
Introduce the following APIs for percpu_array map flag BPF_F_CPU: 1. bpf_map_update_elem_opts(): update percpu_array map using 'const struct bpf_map_update_elem_opts *'. 2. bpf_map_lookup_elem_opts(): lookup percpu_array map using 'const struct bpf_map_lookup_elem_opts *'. 3. bpf_map__lookup_elem_opts(): wrap bpf_map_lookup_elem_opts() with checking arguments. 4. bpf_map__update_elem_opts(): wrap bpf_map_update_elem_opts() with checking arguments. Signed-off-by: Leon Hwang <[email protected]>
The following APIs will be tested: 1. bpf_map_update_batch() 2. bpf_map_lookup_batch() 3. bpf_map_update_elem_opts() 4. bpf_map__update_elem_opts() 5. bpf_map_lookup_elem_opts() 6. bpf_map__lookup_elem_opts() cd tools/testing/selftests/bpf/; ./test_progs -t percpu_alloc/cpu_flag_tests 251/5 percpu_alloc/cpu_flag_tests:OK 251 percpu_alloc:OK Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Leon Hwang <[email protected]>
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