bpf: Introduce BPF_F_CPU and BPF_F_ALL_CPUS flags for percpu maps #9712
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It is to unify map flags checking for lookup_elem, update_elem, lookup_batch and update_batch APIs. Therefore, it will be convenient to check BPF_F_CPU and BPF_F_ALL_CPUS flags in it for these APIs in next patch. Signed-off-by: Leon Hwang <[email protected]>
Introduce BPF_F_CPU and BPF_F_ALL_CPUS flags and check them for following APIs: * 'map_lookup_elem()' * 'map_update_elem()' * 'generic_map_lookup_batch()' * 'generic_map_update_batch()' And, get the correct value size for these APIs. Signed-off-by: Leon Hwang <[email protected]>
…maps Introduce support for the BPF_F_ALL_CPUS flag in percpu_array maps to allow updating values for all CPUs with a single value for both update_elem and update_batch APIs. Introduce support for the BPF_F_CPU flag in percpu_array maps to allow: * update value for specified CPU for both update_elem and update_batch APIs. * lookup value for specified CPU for both lookup_elem and lookup_batch APIs. The BPF_F_CPU flag is passed via: * map_flags of lookup_elem and update_elem APIs along with embedded cpu info. * elem_flags of lookup_batch and update_batch APIs along with embedded cpu info. Signed-off-by: Leon Hwang <[email protected]>
…nd lru_percpu_hash maps Introduce BPF_F_ALL_CPUS flag support for percpu_hash and lru_percpu_hash maps to allow updating values for all CPUs with a single value for both update_elem and update_batch APIs. Introduce BPF_F_CPU flag support for percpu_hash and lru_percpu_hash maps to allow: * update value for specified CPU for both update_elem and update_batch APIs. * lookup value for specified CPU for both lookup_elem and lookup_batch APIs. The BPF_F_CPU flag is passed via: * map_flags along with embedded cpu info. * elem_flags along with embedded cpu info. Signed-off-by: Leon Hwang <[email protected]>
…_storage maps Introduce BPF_F_ALL_CPUS flag support for percpu_cgroup_storage maps to allow updating values for all CPUs with a single value for update_elem API. Introduce BPF_F_CPU flag support for percpu_cgroup_storage maps to allow: * update value for specified CPU for update_elem API. * lookup value for specified CPU for lookup_elem API. The BPF_F_CPU flag is passed via map_flags along with embedded cpu info. Signed-off-by: Leon Hwang <[email protected]>
Add libbpf support for the BPF_F_CPU flag for percpu 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() And the flag can be BPF_F_ALL_CPUS, but cannot be 'BPF_F_CPU | BPF_F_ALL_CPUS'. Behavior: * If the flag is BPF_F_ALL_CPUS, the update is applied across all CPUs. * If the flag is BPF_F_CPU, it updates value only to the specified CPU. * If the flag is BPF_F_CPU, lookup value only from the specified CPU. * lookup does not support BPF_F_ALL_CPUS. Signed-off-by: Leon Hwang <[email protected]>
Add test coverage for the new BPF_F_CPU and BPF_F_ALL_CPUS flags support in percpu 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_percpu_array:OK 253/14 percpu_alloc/cpu_flag_percpu_hash:OK 253/15 percpu_alloc/cpu_flag_lru_percpu_hash:OK 253/16 percpu_alloc/cpu_flag_percpu_cgroup_storage:OK 253 percpu_alloc:OK Summary: 1/16 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Leon Hwang <[email protected]>
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Pull request for series with
subject: bpf: Introduce BPF_F_CPU and BPF_F_ALL_CPUS flags for percpu maps
version: 7
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1001043