bpf: Introduce BPF_F_CPU flag for percpu_array maps #5688
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Introduce support for the BPF_F_CPU flag in percpu_array maps to allow updating values for specified CPU or for all CPUs with a single value. This enhancement enables: * Efficient update of all CPUs using a single value when cpu == (u32)~0. * Targeted update or lookup for a specified CPU otherwise. The flag is passed via: * map_flags in bpf_percpu_array_update() along with embedded cpu field. * elem_flags in generic_map_update_batch() along with embedded cpu field. Signed-off-by: Leon Hwang <[email protected]>
Add libbpf support for the BPF_F_CPU flag for percpu_array maps by embedding the cpu info into the high 32 bits of: 1. **flags**: bpf_map_lookup_elem_flags(), bpf_map__lookup_elem(), bpf_map_update_elem() and bpf_map__update_elem() 2. **opts->elem_flags**: bpf_map_lookup_batch() and bpf_map_update_batch() Behavior: * If cpu is (u32)~0, the update is applied across all CPUs. * Otherwise, it updates value only to the specified CPU. * If cpu is (u32)~0, lookup values across all CPUs. * Otherwise, it lookups value only from the specified CPU. Signed-off-by: Leon Hwang <[email protected]>
This patch adds test coverage for the new BPF_F_CPU flag support in percpu_array maps. The following APIs are exercised: * bpf_map_update_batch() * bpf_map_lookup_batch() * bpf_map_update_elem() * bpf_map__update_elem() * bpf_map_lookup_elem_flags() * bpf_map__lookup_elem() cd tools/testing/selftests/bpf/ ./test_progs -t percpu_alloc 253/13 percpu_alloc/cpu_flag_tests:OK 253 percpu_alloc:OK Summary: 1/13 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Leon Hwang <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=988497 expired. Closing PR. |
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Pull request for series with
subject: bpf: Introduce BPF_F_CPU flag for percpu_array maps
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=988497