2 * Copyright (C) 2016 Netronome Systems, Inc.
4 * This software is dual licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in the top-level directory of this
6 * source tree or the BSD 2-Clause License provided below. You have the
7 * option to license this software under the complete terms of either license.
9 * The BSD 2-Clause License:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * 1. Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * 2. Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #define pr_fmt(fmt) "NFP net bpf: " fmt
36 #include <linux/kernel.h>
37 #include <linux/bpf.h>
38 #include <linux/filter.h>
39 #include <linux/pkt_cls.h>
40 #include <linux/unistd.h>
43 #include "../nfp_asm.h"
45 /* --- NFP prog --- */
46 /* Foreach "multiple" entries macros provide pos and next<n> pointers.
47 * It's safe to modify the next pointers (but not pos).
49 #define nfp_for_each_insn_walk2(nfp_prog, pos, next) \
50 for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \
51 next = list_next_entry(pos, l); \
52 &(nfp_prog)->insns != &pos->l && \
53 &(nfp_prog)->insns != &next->l; \
54 pos = nfp_meta_next(pos), \
55 next = nfp_meta_next(pos))
57 #define nfp_for_each_insn_walk3(nfp_prog, pos, next, next2) \
58 for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \
59 next = list_next_entry(pos, l), \
60 next2 = list_next_entry(next, l); \
61 &(nfp_prog)->insns != &pos->l && \
62 &(nfp_prog)->insns != &next->l && \
63 &(nfp_prog)->insns != &next2->l; \
64 pos = nfp_meta_next(pos), \
65 next = nfp_meta_next(pos), \
66 next2 = nfp_meta_next(next))
69 nfp_meta_has_next(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
71 return meta->l.next != &nfp_prog->insns;
75 nfp_meta_has_prev(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
77 return meta->l.prev != &nfp_prog->insns;
80 static void nfp_prog_free(struct nfp_prog *nfp_prog)
82 struct nfp_insn_meta *meta, *tmp;
84 list_for_each_entry_safe(meta, tmp, &nfp_prog->insns, l) {
91 static void nfp_prog_push(struct nfp_prog *nfp_prog, u64 insn)
93 if (nfp_prog->__prog_alloc_len == nfp_prog->prog_len) {
94 nfp_prog->error = -ENOSPC;
98 nfp_prog->prog[nfp_prog->prog_len] = insn;
102 static unsigned int nfp_prog_current_offset(struct nfp_prog *nfp_prog)
104 return nfp_prog->start_off + nfp_prog->prog_len;
108 nfp_prog_offset_to_index(struct nfp_prog *nfp_prog, unsigned int offset)
110 return offset - nfp_prog->start_off;
113 /* --- Emitters --- */
115 __emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op,
116 u8 mode, u8 xfer, u8 areg, u8 breg, u8 size, bool sync)
118 enum cmd_ctx_swap ctx;
124 ctx = CMD_CTX_NO_SWAP;
126 insn = FIELD_PREP(OP_CMD_A_SRC, areg) |
127 FIELD_PREP(OP_CMD_CTX, ctx) |
128 FIELD_PREP(OP_CMD_B_SRC, breg) |
129 FIELD_PREP(OP_CMD_TOKEN, cmd_tgt_act[op].token) |
130 FIELD_PREP(OP_CMD_XFER, xfer) |
131 FIELD_PREP(OP_CMD_CNT, size) |
132 FIELD_PREP(OP_CMD_SIG, sync) |
133 FIELD_PREP(OP_CMD_TGT_CMD, cmd_tgt_act[op].tgt_cmd) |
134 FIELD_PREP(OP_CMD_MODE, mode);
136 nfp_prog_push(nfp_prog, insn);
140 emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op,
141 u8 mode, u8 xfer, swreg lreg, swreg rreg, u8 size, bool sync)
143 struct nfp_insn_re_regs reg;
146 err = swreg_to_restricted(reg_none(), lreg, rreg, ®, false);
148 nfp_prog->error = err;
152 pr_err("cmd can't swap arguments\n");
153 nfp_prog->error = -EFAULT;
156 if (reg.dst_lmextn || reg.src_lmextn) {
157 pr_err("cmd can't use LMextn\n");
158 nfp_prog->error = -EFAULT;
162 __emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, sync);
166 __emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, enum br_ev_pip ev_pip,
167 enum br_ctx_signal_state css, u16 addr, u8 defer)
169 u16 addr_lo, addr_hi;
172 addr_lo = addr & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
173 addr_hi = addr != addr_lo;
176 FIELD_PREP(OP_BR_MASK, mask) |
177 FIELD_PREP(OP_BR_EV_PIP, ev_pip) |
178 FIELD_PREP(OP_BR_CSS, css) |
179 FIELD_PREP(OP_BR_DEFBR, defer) |
180 FIELD_PREP(OP_BR_ADDR_LO, addr_lo) |
181 FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
183 nfp_prog_push(nfp_prog, insn);
186 static void emit_br_def(struct nfp_prog *nfp_prog, u16 addr, u8 defer)
189 pr_err("BUG: branch defer out of bounds %d\n", defer);
190 nfp_prog->error = -EFAULT;
193 __emit_br(nfp_prog, BR_UNC, BR_EV_PIP_UNCOND, BR_CSS_NONE, addr, defer);
197 emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer)
199 __emit_br(nfp_prog, mask,
200 mask != BR_UNC ? BR_EV_PIP_COND : BR_EV_PIP_UNCOND,
201 BR_CSS_NONE, addr, defer);
205 __emit_br_byte(struct nfp_prog *nfp_prog, u8 areg, u8 breg, bool imm8,
206 u8 byte, bool equal, u16 addr, u8 defer, bool src_lmextn)
208 u16 addr_lo, addr_hi;
211 addr_lo = addr & (OP_BB_ADDR_LO >> __bf_shf(OP_BB_ADDR_LO));
212 addr_hi = addr != addr_lo;
214 insn = OP_BBYTE_BASE |
215 FIELD_PREP(OP_BB_A_SRC, areg) |
216 FIELD_PREP(OP_BB_BYTE, byte) |
217 FIELD_PREP(OP_BB_B_SRC, breg) |
218 FIELD_PREP(OP_BB_I8, imm8) |
219 FIELD_PREP(OP_BB_EQ, equal) |
220 FIELD_PREP(OP_BB_DEFBR, defer) |
221 FIELD_PREP(OP_BB_ADDR_LO, addr_lo) |
222 FIELD_PREP(OP_BB_ADDR_HI, addr_hi) |
223 FIELD_PREP(OP_BB_SRC_LMEXTN, src_lmextn);
225 nfp_prog_push(nfp_prog, insn);
229 emit_br_byte_neq(struct nfp_prog *nfp_prog,
230 swreg src, u8 imm, u8 byte, u16 addr, u8 defer)
232 struct nfp_insn_re_regs reg;
235 err = swreg_to_restricted(reg_none(), src, reg_imm(imm), ®, true);
237 nfp_prog->error = err;
241 __emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr,
242 defer, reg.src_lmextn);
246 __emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi,
247 enum immed_width width, bool invert,
248 enum immed_shift shift, bool wr_both,
249 bool dst_lmextn, bool src_lmextn)
253 insn = OP_IMMED_BASE |
254 FIELD_PREP(OP_IMMED_A_SRC, areg) |
255 FIELD_PREP(OP_IMMED_B_SRC, breg) |
256 FIELD_PREP(OP_IMMED_IMM, imm_hi) |
257 FIELD_PREP(OP_IMMED_WIDTH, width) |
258 FIELD_PREP(OP_IMMED_INV, invert) |
259 FIELD_PREP(OP_IMMED_SHIFT, shift) |
260 FIELD_PREP(OP_IMMED_WR_AB, wr_both) |
261 FIELD_PREP(OP_IMMED_SRC_LMEXTN, src_lmextn) |
262 FIELD_PREP(OP_IMMED_DST_LMEXTN, dst_lmextn);
264 nfp_prog_push(nfp_prog, insn);
268 emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm,
269 enum immed_width width, bool invert, enum immed_shift shift)
271 struct nfp_insn_ur_regs reg;
274 if (swreg_type(dst) == NN_REG_IMM) {
275 nfp_prog->error = -EFAULT;
279 err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), ®);
281 nfp_prog->error = err;
285 __emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width,
286 invert, shift, reg.wr_both,
287 reg.dst_lmextn, reg.src_lmextn);
291 __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
292 enum shf_sc sc, u8 shift,
293 u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both,
294 bool dst_lmextn, bool src_lmextn)
298 if (!FIELD_FIT(OP_SHF_SHIFT, shift)) {
299 nfp_prog->error = -EFAULT;
303 if (sc == SHF_SC_L_SHF)
307 FIELD_PREP(OP_SHF_A_SRC, areg) |
308 FIELD_PREP(OP_SHF_SC, sc) |
309 FIELD_PREP(OP_SHF_B_SRC, breg) |
310 FIELD_PREP(OP_SHF_I8, i8) |
311 FIELD_PREP(OP_SHF_SW, sw) |
312 FIELD_PREP(OP_SHF_DST, dst) |
313 FIELD_PREP(OP_SHF_SHIFT, shift) |
314 FIELD_PREP(OP_SHF_OP, op) |
315 FIELD_PREP(OP_SHF_DST_AB, dst_ab) |
316 FIELD_PREP(OP_SHF_WR_AB, wr_both) |
317 FIELD_PREP(OP_SHF_SRC_LMEXTN, src_lmextn) |
318 FIELD_PREP(OP_SHF_DST_LMEXTN, dst_lmextn);
320 nfp_prog_push(nfp_prog, insn);
324 emit_shf(struct nfp_prog *nfp_prog, swreg dst,
325 swreg lreg, enum shf_op op, swreg rreg, enum shf_sc sc, u8 shift)
327 struct nfp_insn_re_regs reg;
330 err = swreg_to_restricted(dst, lreg, rreg, ®, true);
332 nfp_prog->error = err;
336 __emit_shf(nfp_prog, reg.dst, reg.dst_ab, sc, shift,
337 reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both,
338 reg.dst_lmextn, reg.src_lmextn);
342 __emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
343 u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both,
344 bool dst_lmextn, bool src_lmextn)
349 FIELD_PREP(OP_ALU_A_SRC, areg) |
350 FIELD_PREP(OP_ALU_B_SRC, breg) |
351 FIELD_PREP(OP_ALU_DST, dst) |
352 FIELD_PREP(OP_ALU_SW, swap) |
353 FIELD_PREP(OP_ALU_OP, op) |
354 FIELD_PREP(OP_ALU_DST_AB, dst_ab) |
355 FIELD_PREP(OP_ALU_WR_AB, wr_both) |
356 FIELD_PREP(OP_ALU_SRC_LMEXTN, src_lmextn) |
357 FIELD_PREP(OP_ALU_DST_LMEXTN, dst_lmextn);
359 nfp_prog_push(nfp_prog, insn);
363 emit_alu(struct nfp_prog *nfp_prog, swreg dst,
364 swreg lreg, enum alu_op op, swreg rreg)
366 struct nfp_insn_ur_regs reg;
369 err = swreg_to_unrestricted(dst, lreg, rreg, ®);
371 nfp_prog->error = err;
375 __emit_alu(nfp_prog, reg.dst, reg.dst_ab,
376 reg.areg, op, reg.breg, reg.swap, reg.wr_both,
377 reg.dst_lmextn, reg.src_lmextn);
381 __emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc,
382 u8 areg, u8 bmask, u8 breg, u8 shift, bool imm8,
383 bool zero, bool swap, bool wr_both,
384 bool dst_lmextn, bool src_lmextn)
389 FIELD_PREP(OP_LDF_A_SRC, areg) |
390 FIELD_PREP(OP_LDF_SC, sc) |
391 FIELD_PREP(OP_LDF_B_SRC, breg) |
392 FIELD_PREP(OP_LDF_I8, imm8) |
393 FIELD_PREP(OP_LDF_SW, swap) |
394 FIELD_PREP(OP_LDF_ZF, zero) |
395 FIELD_PREP(OP_LDF_BMASK, bmask) |
396 FIELD_PREP(OP_LDF_SHF, shift) |
397 FIELD_PREP(OP_LDF_WR_AB, wr_both) |
398 FIELD_PREP(OP_LDF_SRC_LMEXTN, src_lmextn) |
399 FIELD_PREP(OP_LDF_DST_LMEXTN, dst_lmextn);
401 nfp_prog_push(nfp_prog, insn);
405 emit_ld_field_any(struct nfp_prog *nfp_prog, enum shf_sc sc, u8 shift,
406 swreg dst, u8 bmask, swreg src, bool zero)
408 struct nfp_insn_re_regs reg;
411 err = swreg_to_restricted(reg_none(), dst, src, ®, true);
413 nfp_prog->error = err;
417 __emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift,
418 reg.i8, zero, reg.swap, reg.wr_both,
419 reg.dst_lmextn, reg.src_lmextn);
423 emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src,
424 enum shf_sc sc, u8 shift)
426 emit_ld_field_any(nfp_prog, sc, shift, dst, bmask, src, false);
429 static void emit_nop(struct nfp_prog *nfp_prog)
431 __emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0);
434 /* --- Wrappers --- */
435 static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift)
437 if (!(imm & 0xffff0000)) {
439 *shift = IMMED_SHIFT_0B;
440 } else if (!(imm & 0xff0000ff)) {
442 *shift = IMMED_SHIFT_1B;
443 } else if (!(imm & 0x0000ffff)) {
445 *shift = IMMED_SHIFT_2B;
453 static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm)
455 enum immed_shift shift;
458 if (pack_immed(imm, &val, &shift)) {
459 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, false, shift);
460 } else if (pack_immed(~imm, &val, &shift)) {
461 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, true, shift);
463 emit_immed(nfp_prog, dst, imm & 0xffff, IMMED_WIDTH_ALL,
464 false, IMMED_SHIFT_0B);
465 emit_immed(nfp_prog, dst, imm >> 16, IMMED_WIDTH_WORD,
466 false, IMMED_SHIFT_2B);
470 /* ur_load_imm_any() - encode immediate or use tmp register (unrestricted)
471 * If the @imm is small enough encode it directly in operand and return
472 * otherwise load @imm to a spare register and return its encoding.
474 static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
476 if (FIELD_FIT(UR_REG_IMM_MAX, imm))
479 wrp_immed(nfp_prog, tmp_reg, imm);
483 /* re_load_imm_any() - encode immediate or use tmp register (restricted)
484 * If the @imm is small enough encode it directly in operand and return
485 * otherwise load @imm to a spare register and return its encoding.
487 static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
489 if (FIELD_FIT(RE_REG_IMM_MAX, imm))
492 wrp_immed(nfp_prog, tmp_reg, imm);
497 wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask,
498 enum br_special special)
500 emit_br(nfp_prog, mask, 0, 0);
502 nfp_prog->prog[nfp_prog->prog_len - 1] |=
503 FIELD_PREP(OP_BR_SPECIAL, special);
506 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src)
508 emit_alu(nfp_prog, reg_both(dst), reg_none(), ALU_OP_NONE, reg_b(src));
512 construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset,
513 u16 src, bool src_valid, u8 size)
519 /* We load the value from the address indicated in @offset and then
520 * shift out the data we don't need. Note: this is big endian!
522 sz = size < 4 ? 4 : size;
523 shift = size < 4 ? 4 - size : 0;
526 /* Calculate the true offset (src_reg + imm) */
527 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
528 emit_alu(nfp_prog, imm_both(nfp_prog),
529 reg_a(src), ALU_OP_ADD, tmp_reg);
530 /* Check packet length (size guaranteed to fit b/c it's u8) */
531 emit_alu(nfp_prog, imm_a(nfp_prog),
532 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size));
533 emit_alu(nfp_prog, reg_none(),
534 plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog));
535 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
537 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
538 pptr_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true);
540 /* Check packet length */
541 tmp_reg = ur_load_imm_any(nfp_prog, offset + size,
543 emit_alu(nfp_prog, reg_none(),
544 plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg);
545 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
547 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
548 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
549 pptr_reg(nfp_prog), tmp_reg, sz - 1, true);
554 emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE,
555 reg_xfer(0), SHF_SC_R_SHF, shift * 8);
557 for (; i * 4 < size; i++)
558 emit_alu(nfp_prog, reg_both(i),
559 reg_none(), ALU_OP_NONE, reg_xfer(i));
562 wrp_immed(nfp_prog, reg_both(1), 0);
567 static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size)
569 return construct_data_ind_ld(nfp_prog, offset, 0, false, size);
573 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
577 if (alu_op == ALU_OP_AND) {
579 wrp_immed(nfp_prog, reg_both(dst), 0);
583 if (alu_op == ALU_OP_OR) {
585 wrp_immed(nfp_prog, reg_both(dst), ~0U);
589 if (alu_op == ALU_OP_XOR) {
591 emit_alu(nfp_prog, reg_both(dst), reg_none(),
592 ALU_OP_NEG, reg_b(dst));
597 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog));
598 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg);
602 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
603 enum alu_op alu_op, bool skip)
605 const struct bpf_insn *insn = &meta->insn;
606 u64 imm = insn->imm; /* sign extend */
613 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U);
614 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32);
620 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
623 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
625 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
626 emit_alu(nfp_prog, reg_both(dst + 1),
627 reg_a(dst + 1), alu_op, reg_b(src + 1));
633 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
634 enum alu_op alu_op, bool skip)
636 const struct bpf_insn *insn = &meta->insn;
643 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm);
644 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
650 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
653 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
655 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
656 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
662 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src,
663 enum br_mask br_mask, u16 off)
665 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src));
666 emit_br(nfp_prog, br_mask, off, 0);
670 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
671 enum alu_op alu_op, enum br_mask br_mask)
673 const struct bpf_insn *insn = &meta->insn;
675 if (insn->off < 0) /* TODO */
678 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op,
679 insn->src_reg * 2, br_mask, insn->off);
680 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op,
681 insn->src_reg * 2 + 1, br_mask, insn->off);
687 wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
688 enum br_mask br_mask, bool swap)
690 const struct bpf_insn *insn = &meta->insn;
691 u64 imm = insn->imm; /* sign extend */
692 u8 reg = insn->dst_reg * 2;
695 if (insn->off < 0) /* TODO */
698 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
700 emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg);
702 emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg));
704 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
706 emit_alu(nfp_prog, reg_none(),
707 reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg);
709 emit_alu(nfp_prog, reg_none(),
710 tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1));
712 emit_br(nfp_prog, br_mask, insn->off, 0);
718 wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
719 enum br_mask br_mask, bool swap)
721 const struct bpf_insn *insn = &meta->insn;
722 u8 areg = insn->src_reg * 2, breg = insn->dst_reg * 2;
724 if (insn->off < 0) /* TODO */
733 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg));
734 emit_alu(nfp_prog, reg_none(),
735 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1));
736 emit_br(nfp_prog, br_mask, insn->off, 0);
741 /* --- Callbacks --- */
742 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
744 const struct bpf_insn *insn = &meta->insn;
746 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2);
747 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1);
752 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
754 u64 imm = meta->insn.imm; /* sign extend */
756 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U);
757 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32);
762 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
764 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR);
767 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
769 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm);
772 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
774 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND);
777 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
779 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
782 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
784 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR);
787 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
789 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
792 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
794 const struct bpf_insn *insn = &meta->insn;
796 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
797 reg_a(insn->dst_reg * 2), ALU_OP_ADD,
798 reg_b(insn->src_reg * 2));
799 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
800 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C,
801 reg_b(insn->src_reg * 2 + 1));
806 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
808 const struct bpf_insn *insn = &meta->insn;
809 u64 imm = insn->imm; /* sign extend */
811 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U);
812 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32);
817 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
819 const struct bpf_insn *insn = &meta->insn;
821 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
822 reg_a(insn->dst_reg * 2), ALU_OP_SUB,
823 reg_b(insn->src_reg * 2));
824 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
825 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C,
826 reg_b(insn->src_reg * 2 + 1));
831 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
833 const struct bpf_insn *insn = &meta->insn;
834 u64 imm = insn->imm; /* sign extend */
836 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U);
837 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32);
842 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
844 const struct bpf_insn *insn = &meta->insn;
845 u8 dst = insn->dst_reg * 2;
847 if (insn->imm < 32) {
848 emit_shf(nfp_prog, reg_both(dst + 1),
849 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
850 SHF_SC_R_DSHF, 32 - insn->imm);
851 emit_shf(nfp_prog, reg_both(dst),
852 reg_none(), SHF_OP_NONE, reg_b(dst),
853 SHF_SC_L_SHF, insn->imm);
854 } else if (insn->imm == 32) {
855 wrp_reg_mov(nfp_prog, dst + 1, dst);
856 wrp_immed(nfp_prog, reg_both(dst), 0);
857 } else if (insn->imm > 32) {
858 emit_shf(nfp_prog, reg_both(dst + 1),
859 reg_none(), SHF_OP_NONE, reg_b(dst),
860 SHF_SC_L_SHF, insn->imm - 32);
861 wrp_immed(nfp_prog, reg_both(dst), 0);
867 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
869 const struct bpf_insn *insn = &meta->insn;
870 u8 dst = insn->dst_reg * 2;
872 if (insn->imm < 32) {
873 emit_shf(nfp_prog, reg_both(dst),
874 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
875 SHF_SC_R_DSHF, insn->imm);
876 emit_shf(nfp_prog, reg_both(dst + 1),
877 reg_none(), SHF_OP_NONE, reg_b(dst + 1),
878 SHF_SC_R_SHF, insn->imm);
879 } else if (insn->imm == 32) {
880 wrp_reg_mov(nfp_prog, dst, dst + 1);
881 wrp_immed(nfp_prog, reg_both(dst + 1), 0);
882 } else if (insn->imm > 32) {
883 emit_shf(nfp_prog, reg_both(dst),
884 reg_none(), SHF_OP_NONE, reg_b(dst + 1),
885 SHF_SC_R_SHF, insn->imm - 32);
886 wrp_immed(nfp_prog, reg_both(dst + 1), 0);
892 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
894 const struct bpf_insn *insn = &meta->insn;
896 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2);
897 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
902 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
904 const struct bpf_insn *insn = &meta->insn;
906 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
907 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
912 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
914 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR);
917 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
919 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm);
922 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
924 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND);
927 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
929 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
932 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
934 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR);
937 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
939 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
942 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
944 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD);
947 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
949 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm);
952 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
954 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB);
957 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
959 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm);
962 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
964 const struct bpf_insn *insn = &meta->insn;
967 return 1; /* TODO: zero shift means indirect */
969 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2),
970 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2),
971 SHF_SC_L_SHF, insn->imm);
972 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
977 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
979 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1),
985 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
987 const struct bpf_insn *insn = &meta->insn;
989 meta->double_cb = imm_ld8_part2;
990 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
995 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
997 return construct_data_ld(nfp_prog, meta->insn.imm, 1);
1000 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1002 return construct_data_ld(nfp_prog, meta->insn.imm, 2);
1005 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1007 return construct_data_ld(nfp_prog, meta->insn.imm, 4);
1010 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1012 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1013 meta->insn.src_reg * 2, true, 1);
1016 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1018 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1019 meta->insn.src_reg * 2, true, 2);
1022 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1024 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1025 meta->insn.src_reg * 2, true, 4);
1028 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1030 if (meta->insn.off == offsetof(struct sk_buff, len))
1031 emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2),
1032 reg_none(), ALU_OP_NONE, plen_reg(nfp_prog));
1039 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1041 swreg dst = reg_both(meta->insn.dst_reg * 2);
1043 if (meta->insn.off != offsetof(struct xdp_md, data) &&
1044 meta->insn.off != offsetof(struct xdp_md, data_end))
1047 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, pptr_reg(nfp_prog));
1049 if (meta->insn.off == offsetof(struct xdp_md, data))
1052 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, plen_reg(nfp_prog));
1057 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1061 if (nfp_prog->act == NN_ACT_XDP)
1062 ret = mem_ldx4_xdp(nfp_prog, meta);
1064 ret = mem_ldx4_skb(nfp_prog, meta);
1066 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
1071 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1076 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1081 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1083 if (nfp_prog->act == NN_ACT_XDP)
1084 return mem_stx4_xdp(nfp_prog, meta);
1085 return mem_stx4_skb(nfp_prog, meta);
1088 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1090 if (meta->insn.off < 0) /* TODO */
1092 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0);
1097 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1099 const struct bpf_insn *insn = &meta->insn;
1100 u64 imm = insn->imm; /* sign extend */
1101 swreg or1, or2, tmp_reg;
1103 or1 = reg_a(insn->dst_reg * 2);
1104 or2 = reg_b(insn->dst_reg * 2 + 1);
1106 if (insn->off < 0) /* TODO */
1110 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1111 emit_alu(nfp_prog, imm_a(nfp_prog),
1112 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
1113 or1 = imm_a(nfp_prog);
1117 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1118 emit_alu(nfp_prog, imm_b(nfp_prog),
1119 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
1120 or2 = imm_b(nfp_prog);
1123 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2);
1124 emit_br(nfp_prog, BR_BEQ, insn->off, 0);
1129 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1131 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false);
1134 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1136 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true);
1139 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1141 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false);
1144 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1146 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true);
1149 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1151 const struct bpf_insn *insn = &meta->insn;
1152 u64 imm = insn->imm; /* sign extend */
1155 if (insn->off < 0) /* TODO */
1164 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1165 emit_alu(nfp_prog, reg_none(),
1166 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg);
1167 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1171 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1172 emit_alu(nfp_prog, reg_none(),
1173 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg);
1174 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1180 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1182 const struct bpf_insn *insn = &meta->insn;
1183 u64 imm = insn->imm; /* sign extend */
1186 if (insn->off < 0) /* TODO */
1190 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2),
1191 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1));
1192 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1195 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1196 emit_alu(nfp_prog, reg_none(),
1197 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
1198 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1200 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1201 emit_alu(nfp_prog, reg_none(),
1202 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
1203 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1208 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1210 const struct bpf_insn *insn = &meta->insn;
1212 if (insn->off < 0) /* TODO */
1215 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2),
1216 ALU_OP_XOR, reg_b(insn->src_reg * 2));
1217 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1),
1218 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1));
1219 emit_alu(nfp_prog, reg_none(),
1220 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog));
1221 emit_br(nfp_prog, BR_BEQ, insn->off, 0);
1226 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1228 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false);
1231 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1233 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true);
1236 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1238 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false);
1241 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1243 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true);
1246 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1248 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE);
1251 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1253 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE);
1256 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1258 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT);
1263 static const instr_cb_t instr_cb[256] = {
1264 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64,
1265 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64,
1266 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64,
1267 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64,
1268 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64,
1269 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64,
1270 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64,
1271 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64,
1272 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64,
1273 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64,
1274 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64,
1275 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64,
1276 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64,
1277 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64,
1278 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg,
1279 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm,
1280 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg,
1281 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm,
1282 [BPF_ALU | BPF_AND | BPF_X] = and_reg,
1283 [BPF_ALU | BPF_AND | BPF_K] = and_imm,
1284 [BPF_ALU | BPF_OR | BPF_X] = or_reg,
1285 [BPF_ALU | BPF_OR | BPF_K] = or_imm,
1286 [BPF_ALU | BPF_ADD | BPF_X] = add_reg,
1287 [BPF_ALU | BPF_ADD | BPF_K] = add_imm,
1288 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg,
1289 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm,
1290 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm,
1291 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8,
1292 [BPF_LD | BPF_ABS | BPF_B] = data_ld1,
1293 [BPF_LD | BPF_ABS | BPF_H] = data_ld2,
1294 [BPF_LD | BPF_ABS | BPF_W] = data_ld4,
1295 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1,
1296 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2,
1297 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4,
1298 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4,
1299 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4,
1300 [BPF_JMP | BPF_JA | BPF_K] = jump,
1301 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm,
1302 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm,
1303 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm,
1304 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm,
1305 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm,
1306 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm,
1307 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm,
1308 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg,
1309 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg,
1310 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg,
1311 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg,
1312 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg,
1313 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg,
1314 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg,
1315 [BPF_JMP | BPF_EXIT] = goto_out,
1318 /* --- Misc code --- */
1319 static void br_set_offset(u64 *instr, u16 offset)
1321 u16 addr_lo, addr_hi;
1323 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
1324 addr_hi = offset != addr_lo;
1325 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO);
1326 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
1327 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo);
1330 /* --- Assembler logic --- */
1331 static int nfp_fixup_branches(struct nfp_prog *nfp_prog)
1333 struct nfp_insn_meta *meta, *next;
1337 nfp_for_each_insn_walk2(nfp_prog, meta, next) {
1340 if (BPF_CLASS(meta->insn.code) != BPF_JMP)
1343 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1;
1344 if (!nfp_is_br(nfp_prog->prog[br_idx])) {
1345 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n",
1346 br_idx, meta->insn.code, nfp_prog->prog[br_idx]);
1349 /* Leave special branches for later */
1350 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]))
1353 /* Find the target offset in assembler realm */
1354 off = meta->insn.off;
1356 pr_err("Fixup found zero offset!!\n");
1360 while (off && nfp_meta_has_next(nfp_prog, next)) {
1361 next = nfp_meta_next(next);
1365 pr_err("Fixup found too large jump!! %d\n", off);
1370 pr_err("Branch landing on removed instruction!!\n");
1374 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off);
1375 idx <= br_idx; idx++) {
1376 if (!nfp_is_br(nfp_prog->prog[idx]))
1378 br_set_offset(&nfp_prog->prog[idx], next->off);
1382 /* Fixup 'goto out's separately, they can be scattered around */
1383 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) {
1384 enum br_special special;
1386 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE)
1389 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]);
1394 br_set_offset(&nfp_prog->prog[br_idx],
1397 case OP_BR_GO_ABORT:
1398 br_set_offset(&nfp_prog->prog[br_idx],
1399 nfp_prog->tgt_abort);
1403 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL;
1409 static void nfp_intro(struct nfp_prog *nfp_prog)
1411 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0));
1412 emit_alu(nfp_prog, plen_reg(nfp_prog),
1413 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog));
1416 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
1418 const u8 act2code[] = {
1419 [NN_ACT_TC_DROP] = 0x22,
1420 [NN_ACT_TC_REDIR] = 0x24
1422 /* Target for aborts */
1423 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1424 wrp_immed(nfp_prog, reg_both(0), 0);
1426 /* Target for normal exits */
1427 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1429 * 0 0x11 -> pass, count as stat0
1430 * -1 drop 0x22 -> drop, count as stat1
1431 * redir 0x24 -> redir, count as stat1
1432 * ife mark 0x21 -> pass, count as stat1
1433 * ife + tx 0x24 -> redir, count as stat1
1435 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2);
1436 emit_alu(nfp_prog, reg_a(0),
1437 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
1438 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
1440 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1);
1441 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]),
1445 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog)
1447 /* TC direct-action mode:
1448 * 0,1 ok NOT SUPPORTED[1]
1449 * 2 drop 0x22 -> drop, count as stat1
1450 * 4,5 nuke 0x02 -> drop
1451 * 7 redir 0x44 -> redir, count as stat2
1452 * * unspec 0x11 -> pass, count as stat0
1454 * [1] We can't support OK and RECLASSIFY because we can't tell TC
1455 * the exact decision made. We are forced to support UNSPEC
1456 * to handle aborts so that's the only one we handle for passing
1457 * packets up the stack.
1459 /* Target for aborts */
1460 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1462 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1464 emit_alu(nfp_prog, reg_a(0),
1465 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
1466 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
1468 /* Target for normal exits */
1469 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1471 /* if R0 > 7 jump to abort */
1472 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0));
1473 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
1474 emit_alu(nfp_prog, reg_a(0),
1475 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
1477 wrp_immed(nfp_prog, reg_b(2), 0x41221211);
1478 wrp_immed(nfp_prog, reg_b(3), 0x41001211);
1480 emit_shf(nfp_prog, reg_a(1),
1481 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2);
1483 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1484 emit_shf(nfp_prog, reg_a(2),
1485 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
1487 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1488 emit_shf(nfp_prog, reg_b(2),
1489 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0);
1491 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1493 emit_shf(nfp_prog, reg_b(2),
1494 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4);
1495 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
1498 static void nfp_outro_xdp(struct nfp_prog *nfp_prog)
1500 /* XDP return codes:
1501 * 0 aborted 0x82 -> drop, count as stat3
1502 * 1 drop 0x22 -> drop, count as stat1
1503 * 2 pass 0x11 -> pass, count as stat0
1504 * 3 tx 0x44 -> redir, count as stat2
1505 * * unknown 0x82 -> drop, count as stat3
1507 /* Target for aborts */
1508 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1510 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1512 emit_alu(nfp_prog, reg_a(0),
1513 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
1514 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16);
1516 /* Target for normal exits */
1517 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1519 /* if R0 > 3 jump to abort */
1520 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0));
1521 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
1523 wrp_immed(nfp_prog, reg_b(2), 0x44112282);
1525 emit_shf(nfp_prog, reg_a(1),
1526 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3);
1528 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1529 emit_shf(nfp_prog, reg_b(2),
1530 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
1532 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1534 emit_alu(nfp_prog, reg_a(0),
1535 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
1536 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
1539 static void nfp_outro(struct nfp_prog *nfp_prog)
1541 switch (nfp_prog->act) {
1543 nfp_outro_tc_da(nfp_prog);
1545 case NN_ACT_TC_DROP:
1546 case NN_ACT_TC_REDIR:
1547 nfp_outro_tc_legacy(nfp_prog);
1550 nfp_outro_xdp(nfp_prog);
1555 static int nfp_translate(struct nfp_prog *nfp_prog)
1557 struct nfp_insn_meta *meta;
1560 nfp_intro(nfp_prog);
1561 if (nfp_prog->error)
1562 return nfp_prog->error;
1564 list_for_each_entry(meta, &nfp_prog->insns, l) {
1565 instr_cb_t cb = instr_cb[meta->insn.code];
1567 meta->off = nfp_prog_current_offset(nfp_prog);
1570 nfp_prog->n_translated++;
1574 if (nfp_meta_has_prev(nfp_prog, meta) &&
1575 nfp_meta_prev(meta)->double_cb)
1576 cb = nfp_meta_prev(meta)->double_cb;
1579 err = cb(nfp_prog, meta);
1583 nfp_prog->n_translated++;
1586 nfp_outro(nfp_prog);
1587 if (nfp_prog->error)
1588 return nfp_prog->error;
1590 for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++)
1592 if (nfp_prog->error)
1593 return nfp_prog->error;
1595 return nfp_fixup_branches(nfp_prog);
1599 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog,
1604 for (i = 0; i < cnt; i++) {
1605 struct nfp_insn_meta *meta;
1607 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1611 meta->insn = prog[i];
1614 list_add_tail(&meta->l, &nfp_prog->insns);
1620 /* --- Optimizations --- */
1621 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog)
1623 struct nfp_insn_meta *meta;
1625 list_for_each_entry(meta, &nfp_prog->insns, l) {
1626 struct bpf_insn insn = meta->insn;
1628 /* Programs converted from cBPF start with register xoring */
1629 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) &&
1630 insn.src_reg == insn.dst_reg)
1633 /* Programs start with R6 = R1 but we ignore the skb pointer */
1634 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) &&
1635 insn.src_reg == 1 && insn.dst_reg == 6)
1638 /* Return as soon as something doesn't match */
1644 /* Remove masking after load since our load guarantees this is not needed */
1645 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog)
1647 struct nfp_insn_meta *meta1, *meta2;
1648 const s32 exp_mask[] = {
1649 [BPF_B] = 0x000000ffU,
1650 [BPF_H] = 0x0000ffffU,
1651 [BPF_W] = 0xffffffffU,
1654 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) {
1655 struct bpf_insn insn, next;
1660 if (BPF_CLASS(insn.code) != BPF_LD)
1662 if (BPF_MODE(insn.code) != BPF_ABS &&
1663 BPF_MODE(insn.code) != BPF_IND)
1666 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K))
1669 if (!exp_mask[BPF_SIZE(insn.code)])
1671 if (exp_mask[BPF_SIZE(insn.code)] != next.imm)
1674 if (next.src_reg || next.dst_reg)
1681 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog)
1683 struct nfp_insn_meta *meta1, *meta2, *meta3;
1685 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) {
1686 struct bpf_insn insn, next1, next2;
1689 next1 = meta2->insn;
1690 next2 = meta3->insn;
1692 if (BPF_CLASS(insn.code) != BPF_LD)
1694 if (BPF_MODE(insn.code) != BPF_ABS &&
1695 BPF_MODE(insn.code) != BPF_IND)
1697 if (BPF_SIZE(insn.code) != BPF_W)
1700 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) &&
1701 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) &&
1702 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) &&
1703 next2.code == (BPF_LSH | BPF_K | BPF_ALU64)))
1706 if (next1.src_reg || next1.dst_reg ||
1707 next2.src_reg || next2.dst_reg)
1710 if (next1.imm != 0x20 || next2.imm != 0x20)
1718 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog)
1720 nfp_bpf_opt_reg_init(nfp_prog);
1722 nfp_bpf_opt_ld_mask(nfp_prog);
1723 nfp_bpf_opt_ld_shift(nfp_prog);
1728 static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore)
1732 for (i = 0; i < nfp_prog->prog_len; i++) {
1735 err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]);
1739 nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]);
1741 ustore[i] = cpu_to_le64(nfp_prog->prog[i]);
1748 * nfp_bpf_jit() - translate BPF code into NFP assembly
1749 * @filter: kernel BPF filter struct
1750 * @prog_mem: memory to store assembler instructions
1751 * @act: action attached to this eBPF program
1752 * @prog_start: offset of the first instruction when loaded
1753 * @prog_done: where to jump on exit
1754 * @prog_sz: size of @prog_mem in instructions
1755 * @res: achieved parameters of translation results
1758 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem,
1759 enum nfp_bpf_action_type act,
1760 unsigned int prog_start, unsigned int prog_done,
1761 unsigned int prog_sz, struct nfp_bpf_result *res)
1763 struct nfp_prog *nfp_prog;
1766 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL);
1770 INIT_LIST_HEAD(&nfp_prog->insns);
1771 nfp_prog->act = act;
1772 nfp_prog->start_off = prog_start;
1773 nfp_prog->tgt_done = prog_done;
1775 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len);
1779 ret = nfp_prog_verify(nfp_prog, filter);
1783 ret = nfp_bpf_optimize(nfp_prog);
1787 nfp_prog->num_regs = MAX_BPF_REG;
1788 nfp_prog->regs_per_thread = 32;
1790 nfp_prog->prog = prog_mem;
1791 nfp_prog->__prog_alloc_len = prog_sz;
1793 ret = nfp_translate(nfp_prog);
1795 pr_err("Translation failed with error %d (translated: %u)\n",
1796 ret, nfp_prog->n_translated);
1801 ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem);
1803 res->n_instr = nfp_prog->prog_len;
1804 res->dense_mode = false;
1806 nfp_prog_free(nfp_prog);