From 5c8fd7e2b5b0a527cf88740da122166695382a78 Mon Sep 17 00:00:00 2001 From: Mykyta Yatsenko Date: Tue, 23 Sep 2025 12:24:00 +0100 Subject: bpf: bpf task work plumbing This patch adds necessary plumbing in verifier, syscall and maps to support handling new kfunc bpf_task_work_schedule and kernel structure bpf_task_work. The idea is similar to how we already handle bpf_wq and bpf_timer. verifier changes validate calls to bpf_task_work_schedule to make sure it is safe and expected invariants hold. btf part is required to detect bpf_task_work structure inside map value and store its offset, which will be used in the next patch to calculate key and value addresses. arraymap and hashtab changes are needed to handle freeing of the bpf_task_work: run code needed to deinitialize it, for example cancel task_work callback if possible. The use of bpf_task_work and proper implementation for kfuncs are introduced in the next patch. Signed-off-by: Mykyta Yatsenko Acked-by: Andrii Nakryiko Acked-by: Eduard Zingerman Link: https://lore.kernel.org/r/20250923112404.668720-6-mykyta.yatsenko5@gmail.com Signed-off-by: Alexei Starovoitov --- include/uapi/linux/bpf.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index f3b173e48b0f..ae83d8649ef1 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -7436,6 +7436,10 @@ struct bpf_timer { __u64 __opaque[2]; } __attribute__((aligned(8))); +struct bpf_task_work { + __u64 __opaque; +} __attribute__((aligned(8))); + struct bpf_wq { __u64 __opaque[2]; } __attribute__((aligned(8))); -- cgit v1.2.3