diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/jit.c')
-rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/jit.c | 231 |
1 files changed, 177 insertions, 54 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index e23ca90289f7..4d9d3806908e 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -1266,7 +1266,7 @@ wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, u64 imm = insn->imm; /* sign extend */ if (skip) { - meta->skip = true; + meta->flags |= FLAG_INSN_SKIP_NOOP; return 0; } @@ -1296,7 +1296,7 @@ wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, const struct bpf_insn *insn = &meta->insn; if (skip) { - meta->skip = true; + meta->flags |= FLAG_INSN_SKIP_NOOP; return 0; } @@ -1334,8 +1334,9 @@ wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op, insn->src_reg * 2, br_mask, insn->off); - wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, - insn->src_reg * 2 + 1, br_mask, insn->off); + if (is_mbpf_jmp64(meta)) + wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, + insn->src_reg * 2 + 1, br_mask, insn->off); return 0; } @@ -1390,13 +1391,15 @@ static int cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) else emit_alu(nfp_prog, reg_none(), tmp_reg, alu_op, reg_a(reg)); - tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); - if (!code->swap) - emit_alu(nfp_prog, reg_none(), - reg_a(reg + 1), carry_op, tmp_reg); - else - emit_alu(nfp_prog, reg_none(), - tmp_reg, carry_op, reg_a(reg + 1)); + if (is_mbpf_jmp64(meta)) { + tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); + if (!code->swap) + emit_alu(nfp_prog, reg_none(), + reg_a(reg + 1), carry_op, tmp_reg); + else + emit_alu(nfp_prog, reg_none(), + tmp_reg, carry_op, reg_a(reg + 1)); + } emit_br(nfp_prog, code->br_mask, insn->off, 0); @@ -1423,8 +1426,9 @@ static int cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) } emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); - emit_alu(nfp_prog, reg_none(), - reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); + if (is_mbpf_jmp64(meta)) + emit_alu(nfp_prog, reg_none(), + reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); emit_br(nfp_prog, code->br_mask, insn->off, 0); return 0; @@ -1963,6 +1967,9 @@ static int neg_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __shl_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst + 1), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, @@ -2075,6 +2082,9 @@ static int shl_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __shr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, shift_amt); @@ -2176,6 +2186,9 @@ static int shr_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __ashr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, shift_amt); @@ -2384,10 +2397,13 @@ static int neg_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 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); + if (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; @@ -2425,18 +2441,75 @@ static int ashr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) return __ashr_imm(nfp_prog, dst, insn->imm); } +static int __shr_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) +{ + if (shift_amt) + emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, + reg_b(dst), SHF_SC_R_SHF, shift_amt); + wrp_immed(nfp_prog, reg_both(dst + 1), 0); + return 0; +} + +static int shr_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 __shr_imm(nfp_prog, dst, insn->imm); +} + +static int shr_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 __shr_imm(nfp_prog, dst, umin); + + src = insn->src_reg * 2; + emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); + emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, + reg_b(dst), SHF_SC_R_SHF); + wrp_immed(nfp_prog, reg_both(dst + 1), 0); + return 0; +} + +static int __shl_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) +{ + if (shift_amt) + emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, + reg_b(dst), SHF_SC_L_SHF, shift_amt); + wrp_immed(nfp_prog, reg_both(dst + 1), 0); + return 0; +} + static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { const struct bpf_insn *insn = &meta->insn; + u8 dst = insn->dst_reg * 2; - if (!insn->imm) - return 1; /* TODO: zero shift means indirect */ + return __shl_imm(nfp_prog, dst, insn->imm); +} - emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), - reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), - SHF_SC_L_SHF, insn->imm); - wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); +static int shl_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 __shl_imm(nfp_prog, dst, umin); + src = insn->src_reg * 2; + shl_reg64_lt32_low(nfp_prog, dst, src); + wrp_immed(nfp_prog, reg_both(dst + 1), 0); return 0; } @@ -3048,6 +3121,19 @@ static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) return 0; } +static int jeq32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) +{ + const struct bpf_insn *insn = &meta->insn; + swreg tmp_reg; + + tmp_reg = ur_load_imm_any(nfp_prog, insn->imm, imm_b(nfp_prog)); + emit_alu(nfp_prog, reg_none(), + reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); + emit_br(nfp_prog, BR_BEQ, insn->off, 0); + + return 0; +} + static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { const struct bpf_insn *insn = &meta->insn; @@ -3061,9 +3147,10 @@ static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) /* Upper word of the mask can only be 0 or ~0 from sign extension, * so either ignore it or OR the whole thing in. */ - if (imm >> 32) + if (is_mbpf_jmp64(meta) && imm >> 32) { emit_alu(nfp_prog, reg_none(), reg_a(dst_gpr + 1), ALU_OP_OR, imm_b(nfp_prog)); + } emit_br(nfp_prog, BR_BNE, insn->off, 0); return 0; @@ -3073,11 +3160,16 @@ static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { const struct bpf_insn *insn = &meta->insn; u64 imm = insn->imm; /* sign extend */ + bool is_jmp32 = is_mbpf_jmp32(meta); swreg tmp_reg; if (!imm) { - emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), - ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); + if (is_jmp32) + emit_alu(nfp_prog, reg_none(), reg_none(), ALU_OP_NONE, + reg_b(insn->dst_reg * 2)); + else + emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), + ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); emit_br(nfp_prog, BR_BNE, insn->off, 0); return 0; } @@ -3087,6 +3179,9 @@ static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); emit_br(nfp_prog, BR_BNE, insn->off, 0); + if (is_jmp32) + return 0; + tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); @@ -3101,10 +3196,13 @@ static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), ALU_OP_XOR, reg_b(insn->src_reg * 2)); - emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1), - ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1)); - emit_alu(nfp_prog, reg_none(), - imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog)); + if (is_mbpf_jmp64(meta)) { + emit_alu(nfp_prog, imm_b(nfp_prog), + reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, + reg_b(insn->src_reg * 2 + 1)); + emit_alu(nfp_prog, reg_none(), imm_a(nfp_prog), ALU_OP_OR, + imm_b(nfp_prog)); + } emit_br(nfp_prog, BR_BEQ, insn->off, 0); return 0; @@ -3182,7 +3280,7 @@ bpf_to_bpf_call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) wrp_immed_relo(nfp_prog, imm_b(nfp_prog), 0, RELO_IMMED_REL); } else { ret_tgt = nfp_prog_current_offset(nfp_prog) + 2; - emit_br(nfp_prog, BR_UNC, meta->n + 1 + meta->insn.imm, 1); + emit_br(nfp_prog, BR_UNC, meta->insn.imm, 1); offset_br = nfp_prog_current_offset(nfp_prog); } wrp_immed_relo(nfp_prog, ret_reg(nfp_prog), ret_tgt, RELO_IMMED_REL); @@ -3321,7 +3419,10 @@ static const instr_cb_t instr_cb[256] = { [BPF_ALU | BPF_DIV | BPF_X] = div_reg, [BPF_ALU | BPF_DIV | BPF_K] = div_imm, [BPF_ALU | BPF_NEG] = neg_reg, + [BPF_ALU | BPF_LSH | BPF_X] = shl_reg, [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, + [BPF_ALU | BPF_RSH | BPF_X] = shr_reg, + [BPF_ALU | BPF_RSH | BPF_K] = shr_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, @@ -3369,6 +3470,28 @@ static const instr_cb_t instr_cb[256] = { [BPF_JMP | BPF_JSLE | BPF_X] = cmp_reg, [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, + [BPF_JMP32 | BPF_JEQ | BPF_K] = jeq32_imm, + [BPF_JMP32 | BPF_JGT | BPF_K] = cmp_imm, + [BPF_JMP32 | BPF_JGE | BPF_K] = cmp_imm, + [BPF_JMP32 | BPF_JLT | BPF_K] = cmp_imm, + [BPF_JMP32 | BPF_JLE | BPF_K] = cmp_imm, + [BPF_JMP32 | BPF_JSGT | BPF_K] =cmp_imm, + [BPF_JMP32 | BPF_JSGE | BPF_K] =cmp_imm, + [BPF_JMP32 | BPF_JSLT | BPF_K] =cmp_imm, + [BPF_JMP32 | BPF_JSLE | BPF_K] =cmp_imm, + [BPF_JMP32 | BPF_JSET | BPF_K] =jset_imm, + [BPF_JMP32 | BPF_JNE | BPF_K] = jne_imm, + [BPF_JMP32 | BPF_JEQ | BPF_X] = jeq_reg, + [BPF_JMP32 | BPF_JGT | BPF_X] = cmp_reg, + [BPF_JMP32 | BPF_JGE | BPF_X] = cmp_reg, + [BPF_JMP32 | BPF_JLT | BPF_X] = cmp_reg, + [BPF_JMP32 | BPF_JLE | BPF_X] = cmp_reg, + [BPF_JMP32 | BPF_JSGT | BPF_X] =cmp_reg, + [BPF_JMP32 | BPF_JSGE | BPF_X] =cmp_reg, + [BPF_JMP32 | BPF_JSLT | BPF_X] =cmp_reg, + [BPF_JMP32 | BPF_JSLE | BPF_X] =cmp_reg, + [BPF_JMP32 | BPF_JSET | BPF_X] =jset_reg, + [BPF_JMP32 | BPF_JNE | BPF_X] = jne_reg, [BPF_JMP | BPF_CALL] = call, [BPF_JMP | BPF_EXIT] = jmp_exit, }; @@ -3395,9 +3518,9 @@ static int nfp_fixup_branches(struct nfp_prog *nfp_prog) int err; list_for_each_entry(meta, &nfp_prog->insns, l) { - if (meta->skip) + if (meta->flags & FLAG_INSN_SKIP_MASK) continue; - if (BPF_CLASS(meta->insn.code) != BPF_JMP) + if (!is_mbpf_jmp(meta)) continue; if (meta->insn.code == (BPF_JMP | BPF_EXIT) && !nfp_is_main_function(meta)) @@ -3439,7 +3562,7 @@ static int nfp_fixup_branches(struct nfp_prog *nfp_prog) jmp_dst = meta->jmp_dst; - if (jmp_dst->skip) { + if (jmp_dst->flags & FLAG_INSN_SKIP_PREC_DEPENDENT) { pr_err("Branch landing on removed instruction!!\n"); return -ELOOP; } @@ -3689,7 +3812,7 @@ static int nfp_translate(struct nfp_prog *nfp_prog) return nfp_prog->error; } - if (meta->skip) { + if (meta->flags & FLAG_INSN_SKIP_MASK) { nfp_prog->n_translated++; continue; } @@ -3737,10 +3860,10 @@ static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) /* Programs start with R6 = R1 but we ignore the skb pointer */ if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && insn.src_reg == 1 && insn.dst_reg == 6) - meta->skip = true; + meta->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; /* Return as soon as something doesn't match */ - if (!meta->skip) + if (!(meta->flags & FLAG_INSN_SKIP_MASK)) return; } } @@ -3755,19 +3878,17 @@ static void nfp_bpf_opt_neg_add_sub(struct nfp_prog *nfp_prog) list_for_each_entry(meta, &nfp_prog->insns, l) { struct bpf_insn insn = meta->insn; - if (meta->skip) + if (meta->flags & FLAG_INSN_SKIP_MASK) continue; - if (BPF_CLASS(insn.code) != BPF_ALU && - BPF_CLASS(insn.code) != BPF_ALU64 && - BPF_CLASS(insn.code) != BPF_JMP) + if (!is_mbpf_alu(meta) && !is_mbpf_jmp(meta)) continue; if (BPF_SRC(insn.code) != BPF_K) continue; if (insn.imm >= 0) continue; - if (BPF_CLASS(insn.code) == BPF_JMP) { + if (is_mbpf_jmp(meta)) { switch (BPF_OP(insn.code)) { case BPF_JGE: case BPF_JSGE: @@ -3829,7 +3950,7 @@ static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) if (meta2->flags & FLAG_INSN_IS_JUMP_DST) continue; - meta2->skip = true; + meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; } } @@ -3869,8 +3990,8 @@ static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) meta3->flags & FLAG_INSN_IS_JUMP_DST) continue; - meta2->skip = true; - meta3->skip = true; + meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; + meta3->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; } } @@ -4065,7 +4186,8 @@ static void nfp_bpf_opt_ldst_gather(struct nfp_prog *nfp_prog) } head_ld_meta->paired_st = &head_st_meta->insn; - head_st_meta->skip = true; + head_st_meta->flags |= + FLAG_INSN_SKIP_PREC_DEPENDENT; } else { head_ld_meta->ldst_gather_len = 0; } @@ -4098,8 +4220,8 @@ static void nfp_bpf_opt_ldst_gather(struct nfp_prog *nfp_prog) head_ld_meta = meta1; head_st_meta = meta2; } else { - meta1->skip = true; - meta2->skip = true; + meta1->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; + meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; } head_ld_meta->ldst_gather_len += BPF_LDST_BYTES(ld); @@ -4124,7 +4246,7 @@ static void nfp_bpf_opt_pkt_cache(struct nfp_prog *nfp_prog) if (meta->flags & FLAG_INSN_IS_JUMP_DST) cache_avail = false; - if (meta->skip) + if (meta->flags & FLAG_INSN_SKIP_MASK) continue; insn = &meta->insn; @@ -4210,7 +4332,7 @@ start_new: } list_for_each_entry(meta, &nfp_prog->insns, l) { - if (meta->skip) + if (meta->flags & FLAG_INSN_SKIP_MASK) continue; if (is_mbpf_load_pkt(meta) && !meta->ldst_gather_len) { @@ -4246,7 +4368,8 @@ static int nfp_bpf_replace_map_ptrs(struct nfp_prog *nfp_prog) u32 id; nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { - if (meta1->skip || meta2->skip) + if (meta1->flags & FLAG_INSN_SKIP_MASK || + meta2->flags & FLAG_INSN_SKIP_MASK) continue; if (meta1->insn.code != (BPF_LD | BPF_IMM | BPF_DW) || @@ -4325,7 +4448,7 @@ int nfp_bpf_jit(struct nfp_prog *nfp_prog) return ret; } -void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt) +void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog) { struct nfp_insn_meta *meta; @@ -4336,7 +4459,7 @@ void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt) unsigned int dst_idx; bool pseudo_call; - if (BPF_CLASS(code) != BPF_JMP) + if (!is_mbpf_jmp(meta)) continue; if (BPF_OP(code) == BPF_EXIT) continue; @@ -4353,7 +4476,7 @@ void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt) else dst_idx = meta->n + 1 + meta->insn.off; - dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_idx, cnt); + dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_idx); if (pseudo_call) dst_meta->flags |= FLAG_INSN_IS_SUBPROG_START; |