sched_ext: Wrap kfunc args in struct to prepare for aux__prog

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scx_bpf_dsq_insert_vtime() and scx_bpf_select_cpu_and() currently have 5
parameters. An upcoming change will add aux__prog parameter which will exceed
BPF's 5 argument limit.

Prepare by adding new kfuncs __scx_bpf_dsq_insert_vtime() and
__scx_bpf_select_cpu_and() that take args structs. The existing kfuncs are
kept as compatibility wrappers. BPF programs use inline wrappers that detect
kernel API version via bpf_core_type_exists() and use the new struct-based
kfuncs when available, falling back to compat kfuncs otherwise. This allows
BPF programs to work with both old and new kernels.

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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This commit is contained in:

Tejun Heo 2025-10-06 15:51:46 -10:00

parent 3035addfaf

commit c0d630ba34

4 changed files with 173 additions and 30 deletions

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100

kernel/sched/ext.c

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43

kernel/sched/ext_idle.c

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6

tools/sched_ext/include/scx/common.bpf.h

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72

tools/sched_ext/include/scx/compat.bpf.h

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