bpf: Add BPF_F_CPU and BPF_F_ALL_CPUS flags support for percpu_array maps

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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 <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260107022022.12843-3-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Leon Hwang 2026-01-07 10:20:17 +08:00 • committed by Alexei Starovoitov

parent 2b421662c7

commit 8eb76cb03f

3 changed files with 31 additions and 9 deletions

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9

include/linux/bpf.h

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31

kernel/bpf/arraymap.c

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2

kernel/bpf/syscall.c

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