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, swreg dst, u8 bmask, swreg src,
406 enum shf_sc sc, u8 shift, bool zero)
408 struct nfp_insn_re_regs reg;
411 /* Note: ld_field is special as it uses one of the src regs as dst */
412 err = swreg_to_restricted(dst, dst, src, ®, true);
414 nfp_prog->error = err;
418 __emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift,
419 reg.i8, zero, reg.swap, reg.wr_both,
420 reg.dst_lmextn, reg.src_lmextn);
424 emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src,
425 enum shf_sc sc, u8 shift)
427 emit_ld_field_any(nfp_prog, dst, bmask, src, sc, shift, false);
430 static void emit_nop(struct nfp_prog *nfp_prog)
432 __emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0);
435 /* --- Wrappers --- */
436 static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift)
438 if (!(imm & 0xffff0000)) {
440 *shift = IMMED_SHIFT_0B;
441 } else if (!(imm & 0xff0000ff)) {
443 *shift = IMMED_SHIFT_1B;
444 } else if (!(imm & 0x0000ffff)) {
446 *shift = IMMED_SHIFT_2B;
454 static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm)
456 enum immed_shift shift;
459 if (pack_immed(imm, &val, &shift)) {
460 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, false, shift);
461 } else if (pack_immed(~imm, &val, &shift)) {
462 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, true, shift);
464 emit_immed(nfp_prog, dst, imm & 0xffff, IMMED_WIDTH_ALL,
465 false, IMMED_SHIFT_0B);
466 emit_immed(nfp_prog, dst, imm >> 16, IMMED_WIDTH_WORD,
467 false, IMMED_SHIFT_2B);
471 /* ur_load_imm_any() - encode immediate or use tmp register (unrestricted)
472 * If the @imm is small enough encode it directly in operand and return
473 * otherwise load @imm to a spare register and return its encoding.
475 static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
477 if (FIELD_FIT(UR_REG_IMM_MAX, imm))
480 wrp_immed(nfp_prog, tmp_reg, imm);
484 /* re_load_imm_any() - encode immediate or use tmp register (restricted)
485 * If the @imm is small enough encode it directly in operand and return
486 * otherwise load @imm to a spare register and return its encoding.
488 static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
490 if (FIELD_FIT(RE_REG_IMM_MAX, imm))
493 wrp_immed(nfp_prog, tmp_reg, imm);
498 wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask,
499 enum br_special special)
501 emit_br(nfp_prog, mask, 0, 0);
503 nfp_prog->prog[nfp_prog->prog_len - 1] |=
504 FIELD_PREP(OP_BR_SPECIAL, special);
507 static void wrp_mov(struct nfp_prog *nfp_prog, swreg dst, swreg src)
509 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, src);
512 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src)
514 wrp_mov(nfp_prog, reg_both(dst), reg_b(src));
518 construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset,
519 u16 src, bool src_valid, u8 size)
525 /* We load the value from the address indicated in @offset and then
526 * shift out the data we don't need. Note: this is big endian!
528 sz = size < 4 ? 4 : size;
529 shift = size < 4 ? 4 - size : 0;
532 /* Calculate the true offset (src_reg + imm) */
533 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
534 emit_alu(nfp_prog, imm_both(nfp_prog),
535 reg_a(src), ALU_OP_ADD, tmp_reg);
536 /* Check packet length (size guaranteed to fit b/c it's u8) */
537 emit_alu(nfp_prog, imm_a(nfp_prog),
538 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size));
539 emit_alu(nfp_prog, reg_none(),
540 plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog));
541 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
543 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
544 pptr_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true);
546 /* Check packet length */
547 tmp_reg = ur_load_imm_any(nfp_prog, offset + size,
549 emit_alu(nfp_prog, reg_none(),
550 plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg);
551 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
553 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
554 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
555 pptr_reg(nfp_prog), tmp_reg, sz - 1, true);
560 emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE,
561 reg_xfer(0), SHF_SC_R_SHF, shift * 8);
563 for (; i * 4 < size; i++)
564 wrp_mov(nfp_prog, reg_both(i), reg_xfer(i));
567 wrp_immed(nfp_prog, reg_both(1), 0);
572 static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size)
574 return construct_data_ind_ld(nfp_prog, offset, 0, false, size);
578 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
582 if (alu_op == ALU_OP_AND) {
584 wrp_immed(nfp_prog, reg_both(dst), 0);
588 if (alu_op == ALU_OP_OR) {
590 wrp_immed(nfp_prog, reg_both(dst), ~0U);
594 if (alu_op == ALU_OP_XOR) {
596 emit_alu(nfp_prog, reg_both(dst), reg_none(),
597 ALU_OP_NEG, reg_b(dst));
602 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog));
603 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg);
607 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
608 enum alu_op alu_op, bool skip)
610 const struct bpf_insn *insn = &meta->insn;
611 u64 imm = insn->imm; /* sign extend */
618 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U);
619 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32);
625 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
628 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
630 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
631 emit_alu(nfp_prog, reg_both(dst + 1),
632 reg_a(dst + 1), alu_op, reg_b(src + 1));
638 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
639 enum alu_op alu_op, bool skip)
641 const struct bpf_insn *insn = &meta->insn;
648 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm);
649 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
655 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
658 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
660 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
661 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
667 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src,
668 enum br_mask br_mask, u16 off)
670 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src));
671 emit_br(nfp_prog, br_mask, off, 0);
675 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
676 enum alu_op alu_op, enum br_mask br_mask)
678 const struct bpf_insn *insn = &meta->insn;
680 if (insn->off < 0) /* TODO */
683 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op,
684 insn->src_reg * 2, br_mask, insn->off);
685 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op,
686 insn->src_reg * 2 + 1, br_mask, insn->off);
692 wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
693 enum br_mask br_mask, bool swap)
695 const struct bpf_insn *insn = &meta->insn;
696 u64 imm = insn->imm; /* sign extend */
697 u8 reg = insn->dst_reg * 2;
700 if (insn->off < 0) /* TODO */
703 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
705 emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg);
707 emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg));
709 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
711 emit_alu(nfp_prog, reg_none(),
712 reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg);
714 emit_alu(nfp_prog, reg_none(),
715 tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1));
717 emit_br(nfp_prog, br_mask, insn->off, 0);
723 wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
724 enum br_mask br_mask, bool swap)
726 const struct bpf_insn *insn = &meta->insn;
729 areg = insn->dst_reg * 2;
730 breg = insn->src_reg * 2;
732 if (insn->off < 0) /* TODO */
741 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg));
742 emit_alu(nfp_prog, reg_none(),
743 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1));
744 emit_br(nfp_prog, br_mask, insn->off, 0);
749 static void wrp_end32(struct nfp_prog *nfp_prog, swreg reg_in, u8 gpr_out)
751 emit_ld_field(nfp_prog, reg_both(gpr_out), 0xf, reg_in,
753 emit_ld_field(nfp_prog, reg_both(gpr_out), 0x5, reg_a(gpr_out),
757 /* --- Callbacks --- */
758 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
760 const struct bpf_insn *insn = &meta->insn;
762 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2);
763 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1);
768 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
770 u64 imm = meta->insn.imm; /* sign extend */
772 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U);
773 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32);
778 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
780 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR);
783 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
785 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm);
788 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
790 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND);
793 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
795 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
798 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
800 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR);
803 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
805 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
808 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
810 const struct bpf_insn *insn = &meta->insn;
812 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
813 reg_a(insn->dst_reg * 2), ALU_OP_ADD,
814 reg_b(insn->src_reg * 2));
815 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
816 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C,
817 reg_b(insn->src_reg * 2 + 1));
822 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
824 const struct bpf_insn *insn = &meta->insn;
825 u64 imm = insn->imm; /* sign extend */
827 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U);
828 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32);
833 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
835 const struct bpf_insn *insn = &meta->insn;
837 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
838 reg_a(insn->dst_reg * 2), ALU_OP_SUB,
839 reg_b(insn->src_reg * 2));
840 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
841 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C,
842 reg_b(insn->src_reg * 2 + 1));
847 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
849 const struct bpf_insn *insn = &meta->insn;
850 u64 imm = insn->imm; /* sign extend */
852 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U);
853 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32);
858 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
860 const struct bpf_insn *insn = &meta->insn;
861 u8 dst = insn->dst_reg * 2;
863 if (insn->imm < 32) {
864 emit_shf(nfp_prog, reg_both(dst + 1),
865 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
866 SHF_SC_R_DSHF, 32 - insn->imm);
867 emit_shf(nfp_prog, reg_both(dst),
868 reg_none(), SHF_OP_NONE, reg_b(dst),
869 SHF_SC_L_SHF, insn->imm);
870 } else if (insn->imm == 32) {
871 wrp_reg_mov(nfp_prog, dst + 1, dst);
872 wrp_immed(nfp_prog, reg_both(dst), 0);
873 } else if (insn->imm > 32) {
874 emit_shf(nfp_prog, reg_both(dst + 1),
875 reg_none(), SHF_OP_NONE, reg_b(dst),
876 SHF_SC_L_SHF, insn->imm - 32);
877 wrp_immed(nfp_prog, reg_both(dst), 0);
883 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
885 const struct bpf_insn *insn = &meta->insn;
886 u8 dst = insn->dst_reg * 2;
888 if (insn->imm < 32) {
889 emit_shf(nfp_prog, reg_both(dst),
890 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
891 SHF_SC_R_DSHF, insn->imm);
892 emit_shf(nfp_prog, reg_both(dst + 1),
893 reg_none(), SHF_OP_NONE, reg_b(dst + 1),
894 SHF_SC_R_SHF, insn->imm);
895 } else if (insn->imm == 32) {
896 wrp_reg_mov(nfp_prog, dst, dst + 1);
897 wrp_immed(nfp_prog, reg_both(dst + 1), 0);
898 } else if (insn->imm > 32) {
899 emit_shf(nfp_prog, reg_both(dst),
900 reg_none(), SHF_OP_NONE, reg_b(dst + 1),
901 SHF_SC_R_SHF, insn->imm - 32);
902 wrp_immed(nfp_prog, reg_both(dst + 1), 0);
908 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
910 const struct bpf_insn *insn = &meta->insn;
912 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2);
913 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
918 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
920 const struct bpf_insn *insn = &meta->insn;
922 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
923 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
928 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
930 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR);
933 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
935 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm);
938 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
940 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND);
943 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
945 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
948 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
950 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR);
953 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
955 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
958 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
960 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD);
963 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
965 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm);
968 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
970 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB);
973 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
975 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm);
978 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
980 const struct bpf_insn *insn = &meta->insn;
983 return 1; /* TODO: zero shift means indirect */
985 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2),
986 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2),
987 SHF_SC_L_SHF, insn->imm);
988 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
993 static int end_reg32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
995 const struct bpf_insn *insn = &meta->insn;
996 u8 gpr = insn->dst_reg * 2;
1000 emit_ld_field(nfp_prog, reg_both(gpr), 0x9, reg_b(gpr),
1002 emit_ld_field(nfp_prog, reg_both(gpr), 0xe, reg_a(gpr),
1005 wrp_immed(nfp_prog, reg_both(gpr + 1), 0);
1008 wrp_end32(nfp_prog, reg_a(gpr), gpr);
1009 wrp_immed(nfp_prog, reg_both(gpr + 1), 0);
1012 wrp_mov(nfp_prog, imm_a(nfp_prog), reg_b(gpr + 1));
1014 wrp_end32(nfp_prog, reg_a(gpr), gpr + 1);
1015 wrp_end32(nfp_prog, imm_a(nfp_prog), gpr);
1022 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1024 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1),
1030 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1032 const struct bpf_insn *insn = &meta->insn;
1034 meta->double_cb = imm_ld8_part2;
1035 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
1040 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1042 return construct_data_ld(nfp_prog, meta->insn.imm, 1);
1045 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1047 return construct_data_ld(nfp_prog, meta->insn.imm, 2);
1050 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1052 return construct_data_ld(nfp_prog, meta->insn.imm, 4);
1055 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1057 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1058 meta->insn.src_reg * 2, true, 1);
1061 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1063 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1064 meta->insn.src_reg * 2, true, 2);
1067 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1069 return construct_data_ind_ld(nfp_prog, meta->insn.imm,
1070 meta->insn.src_reg * 2, true, 4);
1073 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1075 if (meta->insn.off == offsetof(struct sk_buff, len))
1077 reg_both(meta->insn.dst_reg * 2), plen_reg(nfp_prog));
1084 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1086 swreg dst = reg_both(meta->insn.dst_reg * 2);
1088 if (meta->insn.off != offsetof(struct xdp_md, data) &&
1089 meta->insn.off != offsetof(struct xdp_md, data_end))
1092 wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog));
1094 if (meta->insn.off == offsetof(struct xdp_md, data))
1097 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, plen_reg(nfp_prog));
1102 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1106 if (nfp_prog->act == NN_ACT_XDP)
1107 ret = mem_ldx4_xdp(nfp_prog, meta);
1109 ret = mem_ldx4_skb(nfp_prog, meta);
1111 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
1116 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1121 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1126 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1128 if (nfp_prog->act == NN_ACT_XDP)
1129 return mem_stx4_xdp(nfp_prog, meta);
1130 return mem_stx4_skb(nfp_prog, meta);
1133 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1135 if (meta->insn.off < 0) /* TODO */
1137 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0);
1142 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1144 const struct bpf_insn *insn = &meta->insn;
1145 u64 imm = insn->imm; /* sign extend */
1146 swreg or1, or2, tmp_reg;
1148 or1 = reg_a(insn->dst_reg * 2);
1149 or2 = reg_b(insn->dst_reg * 2 + 1);
1151 if (insn->off < 0) /* TODO */
1155 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1156 emit_alu(nfp_prog, imm_a(nfp_prog),
1157 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
1158 or1 = imm_a(nfp_prog);
1162 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1163 emit_alu(nfp_prog, imm_b(nfp_prog),
1164 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
1165 or2 = imm_b(nfp_prog);
1168 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2);
1169 emit_br(nfp_prog, BR_BEQ, insn->off, 0);
1174 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1176 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true);
1179 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1181 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false);
1184 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1186 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false);
1189 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1191 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true);
1194 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1196 const struct bpf_insn *insn = &meta->insn;
1197 u64 imm = insn->imm; /* sign extend */
1200 if (insn->off < 0) /* TODO */
1209 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1210 emit_alu(nfp_prog, reg_none(),
1211 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg);
1212 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1216 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1217 emit_alu(nfp_prog, reg_none(),
1218 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg);
1219 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1225 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1227 const struct bpf_insn *insn = &meta->insn;
1228 u64 imm = insn->imm; /* sign extend */
1231 if (insn->off < 0) /* TODO */
1235 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2),
1236 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1));
1237 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1241 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
1242 emit_alu(nfp_prog, reg_none(),
1243 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
1244 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1246 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
1247 emit_alu(nfp_prog, reg_none(),
1248 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
1249 emit_br(nfp_prog, BR_BNE, insn->off, 0);
1254 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1256 const struct bpf_insn *insn = &meta->insn;
1258 if (insn->off < 0) /* TODO */
1261 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2),
1262 ALU_OP_XOR, reg_b(insn->src_reg * 2));
1263 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1),
1264 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1));
1265 emit_alu(nfp_prog, reg_none(),
1266 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog));
1267 emit_br(nfp_prog, BR_BEQ, insn->off, 0);
1272 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1274 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true);
1277 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1279 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false);
1282 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1284 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false);
1287 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1289 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true);
1292 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1294 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE);
1297 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1299 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE);
1302 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
1304 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT);
1309 static const instr_cb_t instr_cb[256] = {
1310 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64,
1311 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64,
1312 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64,
1313 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64,
1314 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64,
1315 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64,
1316 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64,
1317 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64,
1318 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64,
1319 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64,
1320 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64,
1321 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64,
1322 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64,
1323 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64,
1324 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg,
1325 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm,
1326 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg,
1327 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm,
1328 [BPF_ALU | BPF_AND | BPF_X] = and_reg,
1329 [BPF_ALU | BPF_AND | BPF_K] = and_imm,
1330 [BPF_ALU | BPF_OR | BPF_X] = or_reg,
1331 [BPF_ALU | BPF_OR | BPF_K] = or_imm,
1332 [BPF_ALU | BPF_ADD | BPF_X] = add_reg,
1333 [BPF_ALU | BPF_ADD | BPF_K] = add_imm,
1334 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg,
1335 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm,
1336 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm,
1337 [BPF_ALU | BPF_END | BPF_X] = end_reg32,
1338 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8,
1339 [BPF_LD | BPF_ABS | BPF_B] = data_ld1,
1340 [BPF_LD | BPF_ABS | BPF_H] = data_ld2,
1341 [BPF_LD | BPF_ABS | BPF_W] = data_ld4,
1342 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1,
1343 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2,
1344 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4,
1345 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4,
1346 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4,
1347 [BPF_JMP | BPF_JA | BPF_K] = jump,
1348 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm,
1349 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm,
1350 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm,
1351 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm,
1352 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm,
1353 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm,
1354 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm,
1355 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg,
1356 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg,
1357 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg,
1358 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg,
1359 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg,
1360 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg,
1361 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg,
1362 [BPF_JMP | BPF_EXIT] = goto_out,
1365 /* --- Misc code --- */
1366 static void br_set_offset(u64 *instr, u16 offset)
1368 u16 addr_lo, addr_hi;
1370 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
1371 addr_hi = offset != addr_lo;
1372 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO);
1373 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
1374 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo);
1377 /* --- Assembler logic --- */
1378 static int nfp_fixup_branches(struct nfp_prog *nfp_prog)
1380 struct nfp_insn_meta *meta, *next;
1384 nfp_for_each_insn_walk2(nfp_prog, meta, next) {
1387 if (BPF_CLASS(meta->insn.code) != BPF_JMP)
1390 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1;
1391 if (!nfp_is_br(nfp_prog->prog[br_idx])) {
1392 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n",
1393 br_idx, meta->insn.code, nfp_prog->prog[br_idx]);
1396 /* Leave special branches for later */
1397 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]))
1400 /* Find the target offset in assembler realm */
1401 off = meta->insn.off;
1403 pr_err("Fixup found zero offset!!\n");
1407 while (off && nfp_meta_has_next(nfp_prog, next)) {
1408 next = nfp_meta_next(next);
1412 pr_err("Fixup found too large jump!! %d\n", off);
1417 pr_err("Branch landing on removed instruction!!\n");
1421 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off);
1422 idx <= br_idx; idx++) {
1423 if (!nfp_is_br(nfp_prog->prog[idx]))
1425 br_set_offset(&nfp_prog->prog[idx], next->off);
1429 /* Fixup 'goto out's separately, they can be scattered around */
1430 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) {
1431 enum br_special special;
1433 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE)
1436 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]);
1441 br_set_offset(&nfp_prog->prog[br_idx],
1444 case OP_BR_GO_ABORT:
1445 br_set_offset(&nfp_prog->prog[br_idx],
1446 nfp_prog->tgt_abort);
1450 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL;
1456 static void nfp_intro(struct nfp_prog *nfp_prog)
1458 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0));
1459 emit_alu(nfp_prog, plen_reg(nfp_prog),
1460 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog));
1463 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
1465 const u8 act2code[] = {
1466 [NN_ACT_TC_DROP] = 0x22,
1467 [NN_ACT_TC_REDIR] = 0x24
1469 /* Target for aborts */
1470 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1471 wrp_immed(nfp_prog, reg_both(0), 0);
1473 /* Target for normal exits */
1474 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1476 * 0 0x11 -> pass, count as stat0
1477 * -1 drop 0x22 -> drop, count as stat1
1478 * redir 0x24 -> redir, count as stat1
1479 * ife mark 0x21 -> pass, count as stat1
1480 * ife + tx 0x24 -> redir, count as stat1
1482 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2);
1483 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
1484 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
1486 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1);
1487 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]),
1491 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog)
1493 /* TC direct-action mode:
1494 * 0,1 ok NOT SUPPORTED[1]
1495 * 2 drop 0x22 -> drop, count as stat1
1496 * 4,5 nuke 0x02 -> drop
1497 * 7 redir 0x44 -> redir, count as stat2
1498 * * unspec 0x11 -> pass, count as stat0
1500 * [1] We can't support OK and RECLASSIFY because we can't tell TC
1501 * the exact decision made. We are forced to support UNSPEC
1502 * to handle aborts so that's the only one we handle for passing
1503 * packets up the stack.
1505 /* Target for aborts */
1506 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1508 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1510 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
1511 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
1513 /* Target for normal exits */
1514 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1516 /* if R0 > 7 jump to abort */
1517 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0));
1518 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
1519 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
1521 wrp_immed(nfp_prog, reg_b(2), 0x41221211);
1522 wrp_immed(nfp_prog, reg_b(3), 0x41001211);
1524 emit_shf(nfp_prog, reg_a(1),
1525 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2);
1527 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1528 emit_shf(nfp_prog, reg_a(2),
1529 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
1531 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1532 emit_shf(nfp_prog, reg_b(2),
1533 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0);
1535 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1537 emit_shf(nfp_prog, reg_b(2),
1538 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4);
1539 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
1542 static void nfp_outro_xdp(struct nfp_prog *nfp_prog)
1544 /* XDP return codes:
1545 * 0 aborted 0x82 -> drop, count as stat3
1546 * 1 drop 0x22 -> drop, count as stat1
1547 * 2 pass 0x11 -> pass, count as stat0
1548 * 3 tx 0x44 -> redir, count as stat2
1549 * * unknown 0x82 -> drop, count as stat3
1551 /* Target for aborts */
1552 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
1554 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1556 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
1557 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16);
1559 /* Target for normal exits */
1560 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
1562 /* if R0 > 3 jump to abort */
1563 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0));
1564 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
1566 wrp_immed(nfp_prog, reg_b(2), 0x44112282);
1568 emit_shf(nfp_prog, reg_a(1),
1569 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3);
1571 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
1572 emit_shf(nfp_prog, reg_b(2),
1573 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
1575 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
1577 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
1578 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
1581 static void nfp_outro(struct nfp_prog *nfp_prog)
1583 switch (nfp_prog->act) {
1585 nfp_outro_tc_da(nfp_prog);
1587 case NN_ACT_TC_DROP:
1588 case NN_ACT_TC_REDIR:
1589 nfp_outro_tc_legacy(nfp_prog);
1592 nfp_outro_xdp(nfp_prog);
1597 static int nfp_translate(struct nfp_prog *nfp_prog)
1599 struct nfp_insn_meta *meta;
1602 nfp_intro(nfp_prog);
1603 if (nfp_prog->error)
1604 return nfp_prog->error;
1606 list_for_each_entry(meta, &nfp_prog->insns, l) {
1607 instr_cb_t cb = instr_cb[meta->insn.code];
1609 meta->off = nfp_prog_current_offset(nfp_prog);
1612 nfp_prog->n_translated++;
1616 if (nfp_meta_has_prev(nfp_prog, meta) &&
1617 nfp_meta_prev(meta)->double_cb)
1618 cb = nfp_meta_prev(meta)->double_cb;
1621 err = cb(nfp_prog, meta);
1625 nfp_prog->n_translated++;
1628 nfp_outro(nfp_prog);
1629 if (nfp_prog->error)
1630 return nfp_prog->error;
1632 for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++)
1634 if (nfp_prog->error)
1635 return nfp_prog->error;
1637 return nfp_fixup_branches(nfp_prog);
1641 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog,
1646 for (i = 0; i < cnt; i++) {
1647 struct nfp_insn_meta *meta;
1649 meta = kzalloc(sizeof(*meta), GFP_KERNEL);
1653 meta->insn = prog[i];
1656 list_add_tail(&meta->l, &nfp_prog->insns);
1662 /* --- Optimizations --- */
1663 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog)
1665 struct nfp_insn_meta *meta;
1667 list_for_each_entry(meta, &nfp_prog->insns, l) {
1668 struct bpf_insn insn = meta->insn;
1670 /* Programs converted from cBPF start with register xoring */
1671 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) &&
1672 insn.src_reg == insn.dst_reg)
1675 /* Programs start with R6 = R1 but we ignore the skb pointer */
1676 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) &&
1677 insn.src_reg == 1 && insn.dst_reg == 6)
1680 /* Return as soon as something doesn't match */
1686 /* Remove masking after load since our load guarantees this is not needed */
1687 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog)
1689 struct nfp_insn_meta *meta1, *meta2;
1690 const s32 exp_mask[] = {
1691 [BPF_B] = 0x000000ffU,
1692 [BPF_H] = 0x0000ffffU,
1693 [BPF_W] = 0xffffffffU,
1696 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) {
1697 struct bpf_insn insn, next;
1702 if (BPF_CLASS(insn.code) != BPF_LD)
1704 if (BPF_MODE(insn.code) != BPF_ABS &&
1705 BPF_MODE(insn.code) != BPF_IND)
1708 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K))
1711 if (!exp_mask[BPF_SIZE(insn.code)])
1713 if (exp_mask[BPF_SIZE(insn.code)] != next.imm)
1716 if (next.src_reg || next.dst_reg)
1723 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog)
1725 struct nfp_insn_meta *meta1, *meta2, *meta3;
1727 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) {
1728 struct bpf_insn insn, next1, next2;
1731 next1 = meta2->insn;
1732 next2 = meta3->insn;
1734 if (BPF_CLASS(insn.code) != BPF_LD)
1736 if (BPF_MODE(insn.code) != BPF_ABS &&
1737 BPF_MODE(insn.code) != BPF_IND)
1739 if (BPF_SIZE(insn.code) != BPF_W)
1742 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) &&
1743 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) &&
1744 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) &&
1745 next2.code == (BPF_LSH | BPF_K | BPF_ALU64)))
1748 if (next1.src_reg || next1.dst_reg ||
1749 next2.src_reg || next2.dst_reg)
1752 if (next1.imm != 0x20 || next2.imm != 0x20)
1760 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog)
1762 nfp_bpf_opt_reg_init(nfp_prog);
1764 nfp_bpf_opt_ld_mask(nfp_prog);
1765 nfp_bpf_opt_ld_shift(nfp_prog);
1770 static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore)
1774 for (i = 0; i < nfp_prog->prog_len; i++) {
1777 err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]);
1781 nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]);
1783 ustore[i] = cpu_to_le64(nfp_prog->prog[i]);
1790 * nfp_bpf_jit() - translate BPF code into NFP assembly
1791 * @filter: kernel BPF filter struct
1792 * @prog_mem: memory to store assembler instructions
1793 * @act: action attached to this eBPF program
1794 * @prog_start: offset of the first instruction when loaded
1795 * @prog_done: where to jump on exit
1796 * @prog_sz: size of @prog_mem in instructions
1797 * @res: achieved parameters of translation results
1800 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem,
1801 enum nfp_bpf_action_type act,
1802 unsigned int prog_start, unsigned int prog_done,
1803 unsigned int prog_sz, struct nfp_bpf_result *res)
1805 struct nfp_prog *nfp_prog;
1808 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL);
1812 INIT_LIST_HEAD(&nfp_prog->insns);
1813 nfp_prog->act = act;
1814 nfp_prog->start_off = prog_start;
1815 nfp_prog->tgt_done = prog_done;
1817 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len);
1821 ret = nfp_prog_verify(nfp_prog, filter);
1825 ret = nfp_bpf_optimize(nfp_prog);
1829 nfp_prog->num_regs = MAX_BPF_REG;
1830 nfp_prog->regs_per_thread = 32;
1832 nfp_prog->prog = prog_mem;
1833 nfp_prog->__prog_alloc_len = prog_sz;
1835 ret = nfp_translate(nfp_prog);
1837 pr_err("Translation failed with error %d (translated: %u)\n",
1838 ret, nfp_prog->n_translated);
1843 ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem);
1845 res->n_instr = nfp_prog->prog_len;
1846 res->dense_mode = false;
1848 nfp_prog_free(nfp_prog);