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nfp: bpf: factor out is_mbpf_load & is_mbpf_store 

It is usual that we need to check if one BPF insn is for loading/storeing
data from/to memory.

Therefore, it makes sense to factor out related code to become common
helper functions.

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jiong Wang 2017-11-30 21:32:57 -08:00 committed by Daniel Borkmann
parent 5468a8b929
commit 5e4d6d2093
2 changed files with 12 additions and 2 deletions
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10
drivers/net/ethernet/netronome/nfp/bpf/main.h
View File

@ -144,6 +144,16 @@ static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
return BPF_MODE(meta->insn.code);
}
static inline bool is_mbpf_load(const struct nfp_insn_meta *meta)
{
return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM);
}
static inline bool is_mbpf_store(const struct nfp_insn_meta *meta)
{
return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM);
}
/**
* struct nfp_prog - nfp BPF program
* @prog: machine code

4
drivers/net/ethernet/netronome/nfp/bpf/verifier.c
View File

@ -180,10 +180,10 @@ nfp_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn_idx)
if (meta->insn.code == (BPF_JMP | BPF_EXIT))
return nfp_bpf_check_exit(nfp_prog, env);
if ((meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM))
if (is_mbpf_load(meta))
return nfp_bpf_check_ptr(nfp_prog, meta, env,
meta->insn.src_reg);
if ((meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM))
if (is_mbpf_store(meta))
return nfp_bpf_check_ptr(nfp_prog, meta, env,
meta->insn.dst_reg);