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nfp: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_*

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BPF_X support needs indirect shift mode, please see code comments for
details.

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiong Wang 2018-12-05 13:52:33 -05:00 committed by Alexei Starovoitov
parent f860203b01
commit 84708c1386
1 changed files with 45 additions and 0 deletions
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45
drivers/net/ethernet/netronome/nfp/bpf/jit.c
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@ -2382,6 +2382,49 @@ static int neg_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
return 0;
}
static int __ashr_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
{
/* Set signedness bit (MSB of result). */
emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR, reg_imm(0));
emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, reg_b(dst),
SHF_SC_R_SHF, shift_amt);
wrp_immed(nfp_prog, reg_both(dst + 1), 0);
return 0;
}
static int ashr_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 umin, umax;
u8 dst, src;
dst = insn->dst_reg * 2;
umin = meta->umin_src;
umax = meta->umax_src;
if (umin == umax)
return __ashr_imm(nfp_prog, dst, umin);
src = insn->src_reg * 2;
/* NOTE: the first insn will set both indirect shift amount (source A)
* and signedness bit (MSB of result).
*/
emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_b(dst));
emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR,
reg_b(dst), SHF_SC_R_SHF);
wrp_immed(nfp_prog, reg_both(dst + 1), 0);
return 0;
}
static int ashr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u8 dst = insn->dst_reg * 2;
return __ashr_imm(nfp_prog, dst, insn->imm);
}
static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
@ -3286,6 +3329,8 @@ static const instr_cb_t instr_cb[256] = {
[BPF_ALU | BPF_DIV | BPF_K] = div_imm,
[BPF_ALU | BPF_NEG] = neg_reg,
[BPF_ALU | BPF_LSH | BPF_K] = shl_imm,
[BPF_ALU | BPF_ARSH | BPF_X] = ashr_reg,
[BPF_ALU | BPF_ARSH | BPF_K] = ashr_imm,
[BPF_ALU | BPF_END | BPF_X] = end_reg32,
[BPF_LD | BPF_IMM | BPF_DW] = imm_ld8,
[BPF_LD | BPF_ABS | BPF_B] = data_ld1,