From: Daniel Xu <dxu@dxuuu.xyz>
To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: [PATCH bpf-next 0/3] bpf: Omit inlined bounds checks for null elided map lookups
Date: Mon, 20 Jan 2025 21:35:09 -0700 [thread overview]
Message-ID: <cover.1737433945.git.dxu@dxuuu.xyz> (raw)
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
next reply other threads:[~2025-01-21 4:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-21 4:35 Daniel Xu [this message]
2025-01-21 4:35 ` [PATCH bpf-next 1/3] bpf: verifier: Store null elision decision in insn_aux_data Daniel Xu
2025-01-23 0:23 ` Alexei Starovoitov
2025-01-21 4:35 ` [PATCH bpf-next 2/3] bpf: map: Thread null elision metadata to map_gen_lookup Daniel Xu
2025-01-23 0:29 ` Alexei Starovoitov
2025-01-21 4:35 ` [PATCH bpf-next 3/3] bpf: arraymap: Skip boundscheck during inlining when possible Daniel Xu
2025-01-23 0:15 ` Eduard Zingerman
2025-01-23 0:33 ` Alexei Starovoitov
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