netdev - [RFC bpf-next 0/7] bpf: support BPF_ALU

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Message-Id: <1543917395-6130-1-git-send-email-jiong.wang@netronome.com>
Date:   Tue,  4 Dec 2018 04:56:28 -0500
From:   Jiong Wang <jiong.wang@...ronome.com>
To:     daniel@...earbox.net, ast@...nel.org
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        Jiong Wang <jiong.wang@...ronome.com>
Subject: [RFC bpf-next 0/7] bpf: support BPF_ALU | BPF_ARSH

BPF_ALU | BPF_ARSH | BPF_* were rejected by commit: 7891a87efc71
("bpf: arsh is not supported in 32 bit alu thus reject it"). As explained
in the commit message, this is due to there is no complete support for them
on interpreter and various JIT compilation back-ends.

This patch set is a follow-up which completes the missing bits. This also
pave the way for running bpf program compiled with ALU32 instruction
enabled by specifing -mattr=+alu32 to LLVM for which case there is likely
have more BPF_ALU | BPF_ARSH insns that will trigger the rejection code.

test_verifier.c is updated accordingly.

I have tested this patch set on x86-64 and NFP, I need help of review and
test on the arch changes (mips/ppc/s390).

Note, to avoid merge confict, mips change needs to be applied on top of
commit: 20b880a05f06 ("mips: bpf: fix encoding bug for mm_srlv32_op"), it
is on mips-fixes branch at the moment.

Thanks.

Jiong Wang (7):
  bpf: interpreter support BPF_ALU | BPF_ARSH
  mips: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_X
  ppc: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_*
  s390: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_*
  nfp: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_*
  bpf: verifier remove the rejection on BPF_ALU | BPF_ARSH
  selftests: bpf: update testcases for BPF_ALU | BPF_ARSH

 arch/mips/include/asm/uasm.h                 |  1 +
 arch/mips/include/uapi/asm/inst.h            |  1 +
 arch/mips/mm/uasm-micromips.c                |  1 +
 arch/mips/mm/uasm-mips.c                     |  1 +
 arch/mips/mm/uasm.c                          |  9 ++---
 arch/mips/net/ebpf_jit.c                     |  4 +++
 arch/powerpc/include/asm/ppc-opcode.h        |  2 ++
 arch/powerpc/net/bpf_jit.h                   |  4 +++
 arch/powerpc/net/bpf_jit_comp64.c            |  6 ++++
 arch/s390/net/bpf_jit_comp.c                 | 12 +++++++
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 45 ++++++++++++++++++++++++
 kernel/bpf/core.c                            | 52 ++++++++++++++++------------
 kernel/bpf/verifier.c                        |  5 ---
 tools/testing/selftests/bpf/test_verifier.c  | 29 +++++++++++++---
 14 files changed, 137 insertions(+), 35 deletions(-)

-- 
2.7.4