From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jakub Kicinski Subject: [PATCH net-next 06/15] nfp: bpf: remove register rename Date: Sun, 8 Oct 2017 21:04:08 -0700 Message-ID: <20171009040417.22172-7-jakub.kicinski@netronome.com> References: <20171009040417.22172-1-jakub.kicinski@netronome.com> Cc: oss-drivers@netronome.com, Jakub Kicinski To: netdev@vger.kernel.org Return-path: Received: from mail-pf0-f179.google.com ([209.85.192.179]:43947 "EHLO mail-pf0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751653AbdJIEFw (ORCPT ); Mon, 9 Oct 2017 00:05:52 -0400 Received: by mail-pf0-f179.google.com with SMTP id d2so9340782pfh.0 for ; Sun, 08 Oct 2017 21:05:52 -0700 (PDT) In-Reply-To: <20171009040417.22172-1-jakub.kicinski@netronome.com> Sender: netdev-owner@vger.kernel.org List-ID: Remove the register renumbering optimization. To implement calling map and other helpers we need more strict register layout. We can't freely reassign register numbers. This will have the effect of running in 4 context/thread mode, which should be OK since we are moving towards integrating the BPF closer with FW app datapath anyway, and the target datapath itself runs in 4 context mode. Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman --- drivers/net/ethernet/netronome/nfp/bpf/jit.c | 46 ++-------------------------- 1 file changed, 3 insertions(+), 43 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index 095cf50e8450..469dc8a055f2 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -1621,38 +1621,6 @@ static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) } } -/* Try to rename registers so that program uses only low ones */ -static int nfp_bpf_opt_reg_rename(struct nfp_prog *nfp_prog) -{ - bool reg_used[MAX_BPF_REG] = {}; - u8 tgt_reg[MAX_BPF_REG] = {}; - struct nfp_insn_meta *meta; - unsigned int i, j; - - list_for_each_entry(meta, &nfp_prog->insns, l) { - if (meta->skip) - continue; - - reg_used[meta->insn.src_reg] = true; - reg_used[meta->insn.dst_reg] = true; - } - - for (i = 0, j = 0; i < ARRAY_SIZE(tgt_reg); i++) { - if (!reg_used[i]) - continue; - - tgt_reg[i] = j++; - } - nfp_prog->num_regs = j; - - list_for_each_entry(meta, &nfp_prog->insns, l) { - meta->insn.src_reg = tgt_reg[meta->insn.src_reg]; - meta->insn.dst_reg = tgt_reg[meta->insn.dst_reg]; - } - - return 0; -} - /* Remove masking after load since our load guarantees this is not needed */ static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) { @@ -1729,14 +1697,8 @@ static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) { - int ret; - nfp_bpf_opt_reg_init(nfp_prog); - ret = nfp_bpf_opt_reg_rename(nfp_prog); - if (ret) - return ret; - nfp_bpf_opt_ld_mask(nfp_prog); nfp_bpf_opt_ld_shift(nfp_prog); @@ -1783,10 +1745,8 @@ nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, if (ret) goto out; - if (nfp_prog->num_regs <= 7) - nfp_prog->regs_per_thread = 16; - else - nfp_prog->regs_per_thread = 32; + nfp_prog->num_regs = MAX_BPF_REG; + nfp_prog->regs_per_thread = 32; nfp_prog->prog = prog_mem; nfp_prog->__prog_alloc_len = prog_sz; @@ -1799,7 +1759,7 @@ nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, } res->n_instr = nfp_prog->prog_len; - res->dense_mode = nfp_prog->num_regs <= 7; + res->dense_mode = false; out: nfp_prog_free(nfp_prog); -- 2.14.1