From 70c78fc138b6d0ef76d9920034e25082dd3a36ac Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Mon, 23 Oct 2017 11:58:07 -0700 Subject: [PATCH] nfp: bpf: refactor nfp_bpf_check_ptr() nfp_bpf_check_ptr() mostly looks at the pointer register. Add a temporary variable to shorten the code. While at it make sure we print error messages if translation fails to help users identify the problem (to be carried in ext_ack in due course). Signed-off-by: Jakub Kicinski Reviewed-by: Quentin Monnet Signed-off-by: David S. Miller --- .../net/ethernet/netronome/nfp/bpf/verifier.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/bpf/verifier.c b/drivers/net/ethernet/netronome/nfp/bpf/verifier.c index e361c0e3b788..4d2ed84a82e0 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/verifier.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/verifier.c @@ -113,17 +113,23 @@ nfp_bpf_check_exit(struct nfp_prog *nfp_prog, static int nfp_bpf_check_ptr(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, - const struct bpf_verifier_env *env, u8 reg) + const struct bpf_verifier_env *env, u8 reg_no) { - if (env->cur_state.regs[reg].type != PTR_TO_CTX && - env->cur_state.regs[reg].type != PTR_TO_PACKET) + const struct bpf_reg_state *reg = &env->cur_state.regs[reg_no]; + + if (reg->type != PTR_TO_CTX && + reg->type != PTR_TO_PACKET) { + pr_info("unsupported ptr type: %d\n", reg->type); return -EINVAL; + } - if (meta->ptr.type != NOT_INIT && - meta->ptr.type != env->cur_state.regs[reg].type) + if (meta->ptr.type != NOT_INIT && meta->ptr.type != reg->type) { + pr_info("ptr type changed for instruction %d -> %d\n", + meta->ptr.type, reg->type); return -EINVAL; + } - meta->ptr = env->cur_state.regs[reg]; + meta->ptr = *reg; return 0; } -- GitLab