netdev - [PATCH bpf-next 0/3] bpf: Omit inlined bounds checks for null elided map lookups

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Message-ID: <cover.1737433945.git.dxu@dxuuu.xyz>
Date: Mon, 20 Jan 2025 21:35:09 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH bpf-next 0/3] bpf: Omit inlined bounds checks for null elided map lookups

This follows up the null elision patchset with a corresponding codegen
change. When the lookup is known to be inbounds, the inlined lookup can
skip the bounds check.

See final commit for the JIT diff.

Daniel Xu (3):
  bpf: verifier: Store null elision decision in insn_aux_data
  bpf: map: Thread null elision metadata to map_gen_lookup
  bpf: arraymap: Skip boundscheck during inlining when possible

 include/linux/bpf.h          |  2 +-
 include/linux/bpf_verifier.h |  4 ++++
 kernel/bpf/arraymap.c        | 35 ++++++++++++++++++++++-------------
 kernel/bpf/hashtab.c         | 14 ++++++++++----
 kernel/bpf/verifier.c        |  6 ++++--
 net/xdp/xskmap.c             |  4 +++-
 6 files changed, 44 insertions(+), 21 deletions(-)

-- 
2.47.1