1 /* 2 * Copyright (C) 2016 Netronome Systems, Inc. 3 * 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. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 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. 23 * 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 31 * SOFTWARE. 32 */ 33 34 #define pr_fmt(fmt) "NFP net bpf: " fmt 35 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> 41 42 #include "main.h" 43 #include "../nfp_asm.h" 44 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). 48 */ 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)) 56 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)) 67 68 static bool 69 nfp_meta_has_next(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 70 { 71 return meta->l.next != &nfp_prog->insns; 72 } 73 74 static bool 75 nfp_meta_has_prev(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 76 { 77 return meta->l.prev != &nfp_prog->insns; 78 } 79 80 static void nfp_prog_free(struct nfp_prog *nfp_prog) 81 { 82 struct nfp_insn_meta *meta, *tmp; 83 84 list_for_each_entry_safe(meta, tmp, &nfp_prog->insns, l) { 85 list_del(&meta->l); 86 kfree(meta); 87 } 88 kfree(nfp_prog); 89 } 90 91 static void nfp_prog_push(struct nfp_prog *nfp_prog, u64 insn) 92 { 93 if (nfp_prog->__prog_alloc_len == nfp_prog->prog_len) { 94 nfp_prog->error = -ENOSPC; 95 return; 96 } 97 98 nfp_prog->prog[nfp_prog->prog_len] = insn; 99 nfp_prog->prog_len++; 100 } 101 102 static unsigned int nfp_prog_current_offset(struct nfp_prog *nfp_prog) 103 { 104 return nfp_prog->start_off + nfp_prog->prog_len; 105 } 106 107 static unsigned int 108 nfp_prog_offset_to_index(struct nfp_prog *nfp_prog, unsigned int offset) 109 { 110 return offset - nfp_prog->start_off; 111 } 112 113 /* --- Emitters --- */ 114 static void 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) 117 { 118 enum cmd_ctx_swap ctx; 119 u64 insn; 120 121 if (sync) 122 ctx = CMD_CTX_SWAP; 123 else 124 ctx = CMD_CTX_NO_SWAP; 125 126 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); 135 136 nfp_prog_push(nfp_prog, insn); 137 } 138 139 static void 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) 142 { 143 struct nfp_insn_re_regs reg; 144 int err; 145 146 err = swreg_to_restricted(reg_none(), lreg, rreg, ®, false); 147 if (err) { 148 nfp_prog->error = err; 149 return; 150 } 151 if (reg.swap) { 152 pr_err("cmd can't swap arguments\n"); 153 nfp_prog->error = -EFAULT; 154 return; 155 } 156 157 __emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, sync); 158 } 159 160 static void 161 __emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, enum br_ev_pip ev_pip, 162 enum br_ctx_signal_state css, u16 addr, u8 defer) 163 { 164 u16 addr_lo, addr_hi; 165 u64 insn; 166 167 addr_lo = addr & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 168 addr_hi = addr != addr_lo; 169 170 insn = OP_BR_BASE | 171 FIELD_PREP(OP_BR_MASK, mask) | 172 FIELD_PREP(OP_BR_EV_PIP, ev_pip) | 173 FIELD_PREP(OP_BR_CSS, css) | 174 FIELD_PREP(OP_BR_DEFBR, defer) | 175 FIELD_PREP(OP_BR_ADDR_LO, addr_lo) | 176 FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 177 178 nfp_prog_push(nfp_prog, insn); 179 } 180 181 static void emit_br_def(struct nfp_prog *nfp_prog, u16 addr, u8 defer) 182 { 183 if (defer > 2) { 184 pr_err("BUG: branch defer out of bounds %d\n", defer); 185 nfp_prog->error = -EFAULT; 186 return; 187 } 188 __emit_br(nfp_prog, BR_UNC, BR_EV_PIP_UNCOND, BR_CSS_NONE, addr, defer); 189 } 190 191 static void 192 emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer) 193 { 194 __emit_br(nfp_prog, mask, 195 mask != BR_UNC ? BR_EV_PIP_COND : BR_EV_PIP_UNCOND, 196 BR_CSS_NONE, addr, defer); 197 } 198 199 static void 200 __emit_br_byte(struct nfp_prog *nfp_prog, u8 areg, u8 breg, bool imm8, 201 u8 byte, bool equal, u16 addr, u8 defer) 202 { 203 u16 addr_lo, addr_hi; 204 u64 insn; 205 206 addr_lo = addr & (OP_BB_ADDR_LO >> __bf_shf(OP_BB_ADDR_LO)); 207 addr_hi = addr != addr_lo; 208 209 insn = OP_BBYTE_BASE | 210 FIELD_PREP(OP_BB_A_SRC, areg) | 211 FIELD_PREP(OP_BB_BYTE, byte) | 212 FIELD_PREP(OP_BB_B_SRC, breg) | 213 FIELD_PREP(OP_BB_I8, imm8) | 214 FIELD_PREP(OP_BB_EQ, equal) | 215 FIELD_PREP(OP_BB_DEFBR, defer) | 216 FIELD_PREP(OP_BB_ADDR_LO, addr_lo) | 217 FIELD_PREP(OP_BB_ADDR_HI, addr_hi); 218 219 nfp_prog_push(nfp_prog, insn); 220 } 221 222 static void 223 emit_br_byte_neq(struct nfp_prog *nfp_prog, 224 swreg dst, u8 imm, u8 byte, u16 addr, u8 defer) 225 { 226 struct nfp_insn_re_regs reg; 227 int err; 228 229 err = swreg_to_restricted(reg_none(), dst, reg_imm(imm), ®, true); 230 if (err) { 231 nfp_prog->error = err; 232 return; 233 } 234 235 __emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr, 236 defer); 237 } 238 239 static void 240 __emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi, 241 enum immed_width width, bool invert, 242 enum immed_shift shift, bool wr_both) 243 { 244 u64 insn; 245 246 insn = OP_IMMED_BASE | 247 FIELD_PREP(OP_IMMED_A_SRC, areg) | 248 FIELD_PREP(OP_IMMED_B_SRC, breg) | 249 FIELD_PREP(OP_IMMED_IMM, imm_hi) | 250 FIELD_PREP(OP_IMMED_WIDTH, width) | 251 FIELD_PREP(OP_IMMED_INV, invert) | 252 FIELD_PREP(OP_IMMED_SHIFT, shift) | 253 FIELD_PREP(OP_IMMED_WR_AB, wr_both); 254 255 nfp_prog_push(nfp_prog, insn); 256 } 257 258 static void 259 emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm, 260 enum immed_width width, bool invert, enum immed_shift shift) 261 { 262 struct nfp_insn_ur_regs reg; 263 int err; 264 265 if (swreg_type(dst) == NN_REG_IMM) { 266 nfp_prog->error = -EFAULT; 267 return; 268 } 269 270 err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), ®); 271 if (err) { 272 nfp_prog->error = err; 273 return; 274 } 275 276 __emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width, 277 invert, shift, reg.wr_both); 278 } 279 280 static void 281 __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab, 282 enum shf_sc sc, u8 shift, 283 u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both) 284 { 285 u64 insn; 286 287 if (!FIELD_FIT(OP_SHF_SHIFT, shift)) { 288 nfp_prog->error = -EFAULT; 289 return; 290 } 291 292 if (sc == SHF_SC_L_SHF) 293 shift = 32 - shift; 294 295 insn = OP_SHF_BASE | 296 FIELD_PREP(OP_SHF_A_SRC, areg) | 297 FIELD_PREP(OP_SHF_SC, sc) | 298 FIELD_PREP(OP_SHF_B_SRC, breg) | 299 FIELD_PREP(OP_SHF_I8, i8) | 300 FIELD_PREP(OP_SHF_SW, sw) | 301 FIELD_PREP(OP_SHF_DST, dst) | 302 FIELD_PREP(OP_SHF_SHIFT, shift) | 303 FIELD_PREP(OP_SHF_OP, op) | 304 FIELD_PREP(OP_SHF_DST_AB, dst_ab) | 305 FIELD_PREP(OP_SHF_WR_AB, wr_both); 306 307 nfp_prog_push(nfp_prog, insn); 308 } 309 310 static void 311 emit_shf(struct nfp_prog *nfp_prog, swreg dst, 312 swreg lreg, enum shf_op op, swreg rreg, enum shf_sc sc, u8 shift) 313 { 314 struct nfp_insn_re_regs reg; 315 int err; 316 317 err = swreg_to_restricted(dst, lreg, rreg, ®, true); 318 if (err) { 319 nfp_prog->error = err; 320 return; 321 } 322 323 __emit_shf(nfp_prog, reg.dst, reg.dst_ab, sc, shift, 324 reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both); 325 } 326 327 static void 328 __emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab, 329 u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both) 330 { 331 u64 insn; 332 333 insn = OP_ALU_BASE | 334 FIELD_PREP(OP_ALU_A_SRC, areg) | 335 FIELD_PREP(OP_ALU_B_SRC, breg) | 336 FIELD_PREP(OP_ALU_DST, dst) | 337 FIELD_PREP(OP_ALU_SW, swap) | 338 FIELD_PREP(OP_ALU_OP, op) | 339 FIELD_PREP(OP_ALU_DST_AB, dst_ab) | 340 FIELD_PREP(OP_ALU_WR_AB, wr_both); 341 342 nfp_prog_push(nfp_prog, insn); 343 } 344 345 static void 346 emit_alu(struct nfp_prog *nfp_prog, swreg dst, 347 swreg lreg, enum alu_op op, swreg rreg) 348 { 349 struct nfp_insn_ur_regs reg; 350 int err; 351 352 err = swreg_to_unrestricted(dst, lreg, rreg, ®); 353 if (err) { 354 nfp_prog->error = err; 355 return; 356 } 357 358 __emit_alu(nfp_prog, reg.dst, reg.dst_ab, 359 reg.areg, op, reg.breg, reg.swap, reg.wr_both); 360 } 361 362 static void 363 __emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc, 364 u8 areg, u8 bmask, u8 breg, u8 shift, bool imm8, 365 bool zero, bool swap, bool wr_both) 366 { 367 u64 insn; 368 369 insn = OP_LDF_BASE | 370 FIELD_PREP(OP_LDF_A_SRC, areg) | 371 FIELD_PREP(OP_LDF_SC, sc) | 372 FIELD_PREP(OP_LDF_B_SRC, breg) | 373 FIELD_PREP(OP_LDF_I8, imm8) | 374 FIELD_PREP(OP_LDF_SW, swap) | 375 FIELD_PREP(OP_LDF_ZF, zero) | 376 FIELD_PREP(OP_LDF_BMASK, bmask) | 377 FIELD_PREP(OP_LDF_SHF, shift) | 378 FIELD_PREP(OP_LDF_WR_AB, wr_both); 379 380 nfp_prog_push(nfp_prog, insn); 381 } 382 383 static void 384 emit_ld_field_any(struct nfp_prog *nfp_prog, enum shf_sc sc, u8 shift, 385 swreg dst, u8 bmask, swreg src, bool zero) 386 { 387 struct nfp_insn_re_regs reg; 388 int err; 389 390 err = swreg_to_restricted(reg_none(), dst, src, ®, true); 391 if (err) { 392 nfp_prog->error = err; 393 return; 394 } 395 396 __emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift, 397 reg.i8, zero, reg.swap, reg.wr_both); 398 } 399 400 static void 401 emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src, 402 enum shf_sc sc, u8 shift) 403 { 404 emit_ld_field_any(nfp_prog, sc, shift, dst, bmask, src, false); 405 } 406 407 /* --- Wrappers --- */ 408 static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift) 409 { 410 if (!(imm & 0xffff0000)) { 411 *val = imm; 412 *shift = IMMED_SHIFT_0B; 413 } else if (!(imm & 0xff0000ff)) { 414 *val = imm >> 8; 415 *shift = IMMED_SHIFT_1B; 416 } else if (!(imm & 0x0000ffff)) { 417 *val = imm >> 16; 418 *shift = IMMED_SHIFT_2B; 419 } else { 420 return false; 421 } 422 423 return true; 424 } 425 426 static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm) 427 { 428 enum immed_shift shift; 429 u16 val; 430 431 if (pack_immed(imm, &val, &shift)) { 432 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, false, shift); 433 } else if (pack_immed(~imm, &val, &shift)) { 434 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, true, shift); 435 } else { 436 emit_immed(nfp_prog, dst, imm & 0xffff, IMMED_WIDTH_ALL, 437 false, IMMED_SHIFT_0B); 438 emit_immed(nfp_prog, dst, imm >> 16, IMMED_WIDTH_WORD, 439 false, IMMED_SHIFT_2B); 440 } 441 } 442 443 /* ur_load_imm_any() - encode immediate or use tmp register (unrestricted) 444 * If the @imm is small enough encode it directly in operand and return 445 * otherwise load @imm to a spare register and return its encoding. 446 */ 447 static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 448 { 449 if (FIELD_FIT(UR_REG_IMM_MAX, imm)) 450 return reg_imm(imm); 451 452 wrp_immed(nfp_prog, tmp_reg, imm); 453 return tmp_reg; 454 } 455 456 /* re_load_imm_any() - encode immediate or use tmp register (restricted) 457 * If the @imm is small enough encode it directly in operand and return 458 * otherwise load @imm to a spare register and return its encoding. 459 */ 460 static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 461 { 462 if (FIELD_FIT(RE_REG_IMM_MAX, imm)) 463 return reg_imm(imm); 464 465 wrp_immed(nfp_prog, tmp_reg, imm); 466 return tmp_reg; 467 } 468 469 static void 470 wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask, 471 enum br_special special) 472 { 473 emit_br(nfp_prog, mask, 0, 0); 474 475 nfp_prog->prog[nfp_prog->prog_len - 1] |= 476 FIELD_PREP(OP_BR_SPECIAL, special); 477 } 478 479 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src) 480 { 481 emit_alu(nfp_prog, reg_both(dst), reg_none(), ALU_OP_NONE, reg_b(src)); 482 } 483 484 static int 485 construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset, 486 u16 src, bool src_valid, u8 size) 487 { 488 unsigned int i; 489 u16 shift, sz; 490 swreg tmp_reg; 491 492 /* We load the value from the address indicated in @offset and then 493 * shift out the data we don't need. Note: this is big endian! 494 */ 495 sz = size < 4 ? 4 : size; 496 shift = size < 4 ? 4 - size : 0; 497 498 if (src_valid) { 499 /* Calculate the true offset (src_reg + imm) */ 500 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 501 emit_alu(nfp_prog, imm_both(nfp_prog), 502 reg_a(src), ALU_OP_ADD, tmp_reg); 503 /* Check packet length (size guaranteed to fit b/c it's u8) */ 504 emit_alu(nfp_prog, imm_a(nfp_prog), 505 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size)); 506 emit_alu(nfp_prog, reg_none(), 507 NFP_BPF_ABI_LEN, ALU_OP_SUB, imm_a(nfp_prog)); 508 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 509 /* Load data */ 510 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 511 pkt_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true); 512 } else { 513 /* Check packet length */ 514 tmp_reg = ur_load_imm_any(nfp_prog, offset + size, 515 imm_a(nfp_prog)); 516 emit_alu(nfp_prog, reg_none(), 517 NFP_BPF_ABI_LEN, ALU_OP_SUB, tmp_reg); 518 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 519 /* Load data */ 520 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 521 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 522 pkt_reg(nfp_prog), tmp_reg, sz - 1, true); 523 } 524 525 i = 0; 526 if (shift) 527 emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE, 528 reg_xfer(0), SHF_SC_R_SHF, shift * 8); 529 else 530 for (; i * 4 < size; i++) 531 emit_alu(nfp_prog, reg_both(i), 532 reg_none(), ALU_OP_NONE, reg_xfer(i)); 533 534 if (i < 2) 535 wrp_immed(nfp_prog, reg_both(1), 0); 536 537 return 0; 538 } 539 540 static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size) 541 { 542 return construct_data_ind_ld(nfp_prog, offset, 0, false, size); 543 } 544 545 static int wrp_set_mark(struct nfp_prog *nfp_prog, u8 src) 546 { 547 emit_alu(nfp_prog, NFP_BPF_ABI_MARK, 548 reg_none(), ALU_OP_NONE, reg_b(src)); 549 emit_alu(nfp_prog, NFP_BPF_ABI_FLAGS, 550 NFP_BPF_ABI_FLAGS, ALU_OP_OR, reg_imm(NFP_BPF_ABI_FLAG_MARK)); 551 552 return 0; 553 } 554 555 static void 556 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm) 557 { 558 swreg tmp_reg; 559 560 if (alu_op == ALU_OP_AND) { 561 if (!imm) 562 wrp_immed(nfp_prog, reg_both(dst), 0); 563 if (!imm || !~imm) 564 return; 565 } 566 if (alu_op == ALU_OP_OR) { 567 if (!~imm) 568 wrp_immed(nfp_prog, reg_both(dst), ~0U); 569 if (!imm || !~imm) 570 return; 571 } 572 if (alu_op == ALU_OP_XOR) { 573 if (!~imm) 574 emit_alu(nfp_prog, reg_both(dst), reg_none(), 575 ALU_OP_NEG, reg_b(dst)); 576 if (!imm || !~imm) 577 return; 578 } 579 580 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 581 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg); 582 } 583 584 static int 585 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 586 enum alu_op alu_op, bool skip) 587 { 588 const struct bpf_insn *insn = &meta->insn; 589 u64 imm = insn->imm; /* sign extend */ 590 591 if (skip) { 592 meta->skip = true; 593 return 0; 594 } 595 596 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U); 597 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32); 598 599 return 0; 600 } 601 602 static int 603 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 604 enum alu_op alu_op) 605 { 606 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 607 608 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 609 emit_alu(nfp_prog, reg_both(dst + 1), 610 reg_a(dst + 1), alu_op, reg_b(src + 1)); 611 612 return 0; 613 } 614 615 static int 616 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 617 enum alu_op alu_op, bool skip) 618 { 619 const struct bpf_insn *insn = &meta->insn; 620 621 if (skip) { 622 meta->skip = true; 623 return 0; 624 } 625 626 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm); 627 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 628 629 return 0; 630 } 631 632 static int 633 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 634 enum alu_op alu_op) 635 { 636 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 637 638 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 639 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 640 641 return 0; 642 } 643 644 static void 645 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src, 646 enum br_mask br_mask, u16 off) 647 { 648 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src)); 649 emit_br(nfp_prog, br_mask, off, 0); 650 } 651 652 static int 653 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 654 enum alu_op alu_op, enum br_mask br_mask) 655 { 656 const struct bpf_insn *insn = &meta->insn; 657 658 if (insn->off < 0) /* TODO */ 659 return -EOPNOTSUPP; 660 661 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op, 662 insn->src_reg * 2, br_mask, insn->off); 663 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, 664 insn->src_reg * 2 + 1, br_mask, insn->off); 665 666 return 0; 667 } 668 669 static int 670 wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 671 enum br_mask br_mask, bool swap) 672 { 673 const struct bpf_insn *insn = &meta->insn; 674 u64 imm = insn->imm; /* sign extend */ 675 u8 reg = insn->dst_reg * 2; 676 swreg tmp_reg; 677 678 if (insn->off < 0) /* TODO */ 679 return -EOPNOTSUPP; 680 681 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 682 if (!swap) 683 emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg); 684 else 685 emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg)); 686 687 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 688 if (!swap) 689 emit_alu(nfp_prog, reg_none(), 690 reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg); 691 else 692 emit_alu(nfp_prog, reg_none(), 693 tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1)); 694 695 emit_br(nfp_prog, br_mask, insn->off, 0); 696 697 return 0; 698 } 699 700 static int 701 wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 702 enum br_mask br_mask, bool swap) 703 { 704 const struct bpf_insn *insn = &meta->insn; 705 u8 areg = insn->src_reg * 2, breg = insn->dst_reg * 2; 706 707 if (insn->off < 0) /* TODO */ 708 return -EOPNOTSUPP; 709 710 if (swap) { 711 areg ^= breg; 712 breg ^= areg; 713 areg ^= breg; 714 } 715 716 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); 717 emit_alu(nfp_prog, reg_none(), 718 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); 719 emit_br(nfp_prog, br_mask, insn->off, 0); 720 721 return 0; 722 } 723 724 /* --- Callbacks --- */ 725 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 726 { 727 const struct bpf_insn *insn = &meta->insn; 728 729 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 730 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1); 731 732 return 0; 733 } 734 735 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 736 { 737 u64 imm = meta->insn.imm; /* sign extend */ 738 739 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U); 740 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32); 741 742 return 0; 743 } 744 745 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 746 { 747 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR); 748 } 749 750 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 751 { 752 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); 753 } 754 755 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 756 { 757 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND); 758 } 759 760 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 761 { 762 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 763 } 764 765 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 766 { 767 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR); 768 } 769 770 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 771 { 772 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 773 } 774 775 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 776 { 777 const struct bpf_insn *insn = &meta->insn; 778 779 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 780 reg_a(insn->dst_reg * 2), ALU_OP_ADD, 781 reg_b(insn->src_reg * 2)); 782 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 783 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C, 784 reg_b(insn->src_reg * 2 + 1)); 785 786 return 0; 787 } 788 789 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 790 { 791 const struct bpf_insn *insn = &meta->insn; 792 u64 imm = insn->imm; /* sign extend */ 793 794 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U); 795 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32); 796 797 return 0; 798 } 799 800 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 801 { 802 const struct bpf_insn *insn = &meta->insn; 803 804 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 805 reg_a(insn->dst_reg * 2), ALU_OP_SUB, 806 reg_b(insn->src_reg * 2)); 807 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 808 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C, 809 reg_b(insn->src_reg * 2 + 1)); 810 811 return 0; 812 } 813 814 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 815 { 816 const struct bpf_insn *insn = &meta->insn; 817 u64 imm = insn->imm; /* sign extend */ 818 819 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U); 820 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32); 821 822 return 0; 823 } 824 825 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 826 { 827 const struct bpf_insn *insn = &meta->insn; 828 829 if (insn->imm != 32) 830 return 1; /* TODO */ 831 832 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->dst_reg * 2); 833 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), 0); 834 835 return 0; 836 } 837 838 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 839 { 840 const struct bpf_insn *insn = &meta->insn; 841 842 if (insn->imm != 32) 843 return 1; /* TODO */ 844 845 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->dst_reg * 2 + 1); 846 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 847 848 return 0; 849 } 850 851 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 852 { 853 const struct bpf_insn *insn = &meta->insn; 854 855 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 856 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 857 858 return 0; 859 } 860 861 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 862 { 863 const struct bpf_insn *insn = &meta->insn; 864 865 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 866 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 867 868 return 0; 869 } 870 871 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 872 { 873 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR); 874 } 875 876 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 877 { 878 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm); 879 } 880 881 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 882 { 883 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND); 884 } 885 886 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 887 { 888 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 889 } 890 891 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 892 { 893 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR); 894 } 895 896 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 897 { 898 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 899 } 900 901 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 902 { 903 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD); 904 } 905 906 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 907 { 908 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm); 909 } 910 911 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 912 { 913 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB); 914 } 915 916 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 917 { 918 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm); 919 } 920 921 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 922 { 923 const struct bpf_insn *insn = &meta->insn; 924 925 if (!insn->imm) 926 return 1; /* TODO: zero shift means indirect */ 927 928 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), 929 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), 930 SHF_SC_L_SHF, insn->imm); 931 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 932 933 return 0; 934 } 935 936 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 937 { 938 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1), 939 meta->insn.imm); 940 941 return 0; 942 } 943 944 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 945 { 946 const struct bpf_insn *insn = &meta->insn; 947 948 meta->double_cb = imm_ld8_part2; 949 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 950 951 return 0; 952 } 953 954 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 955 { 956 return construct_data_ld(nfp_prog, meta->insn.imm, 1); 957 } 958 959 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 960 { 961 return construct_data_ld(nfp_prog, meta->insn.imm, 2); 962 } 963 964 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 965 { 966 return construct_data_ld(nfp_prog, meta->insn.imm, 4); 967 } 968 969 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 970 { 971 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 972 meta->insn.src_reg * 2, true, 1); 973 } 974 975 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 976 { 977 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 978 meta->insn.src_reg * 2, true, 2); 979 } 980 981 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 982 { 983 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 984 meta->insn.src_reg * 2, true, 4); 985 } 986 987 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 988 { 989 if (meta->insn.off == offsetof(struct sk_buff, len)) 990 emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2), 991 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_LEN); 992 else 993 return -EOPNOTSUPP; 994 995 return 0; 996 } 997 998 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 999 { 1000 swreg dst = reg_both(meta->insn.dst_reg * 2); 1001 1002 if (meta->insn.off != offsetof(struct xdp_md, data) && 1003 meta->insn.off != offsetof(struct xdp_md, data_end)) 1004 return -EOPNOTSUPP; 1005 1006 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, NFP_BPF_ABI_PKT); 1007 1008 if (meta->insn.off == offsetof(struct xdp_md, data)) 1009 return 0; 1010 1011 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, NFP_BPF_ABI_LEN); 1012 1013 return 0; 1014 } 1015 1016 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1017 { 1018 int ret; 1019 1020 if (nfp_prog->act == NN_ACT_XDP) 1021 ret = mem_ldx4_xdp(nfp_prog, meta); 1022 else 1023 ret = mem_ldx4_skb(nfp_prog, meta); 1024 1025 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 1026 1027 return ret; 1028 } 1029 1030 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1031 { 1032 if (meta->insn.off == offsetof(struct sk_buff, mark)) 1033 return wrp_set_mark(nfp_prog, meta->insn.src_reg * 2); 1034 1035 return -EOPNOTSUPP; 1036 } 1037 1038 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1039 { 1040 return -EOPNOTSUPP; 1041 } 1042 1043 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1044 { 1045 if (nfp_prog->act == NN_ACT_XDP) 1046 return mem_stx4_xdp(nfp_prog, meta); 1047 return mem_stx4_skb(nfp_prog, meta); 1048 } 1049 1050 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1051 { 1052 if (meta->insn.off < 0) /* TODO */ 1053 return -EOPNOTSUPP; 1054 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0); 1055 1056 return 0; 1057 } 1058 1059 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1060 { 1061 const struct bpf_insn *insn = &meta->insn; 1062 u64 imm = insn->imm; /* sign extend */ 1063 swreg or1, or2, tmp_reg; 1064 1065 or1 = reg_a(insn->dst_reg * 2); 1066 or2 = reg_b(insn->dst_reg * 2 + 1); 1067 1068 if (insn->off < 0) /* TODO */ 1069 return -EOPNOTSUPP; 1070 1071 if (imm & ~0U) { 1072 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1073 emit_alu(nfp_prog, imm_a(nfp_prog), 1074 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1075 or1 = imm_a(nfp_prog); 1076 } 1077 1078 if (imm >> 32) { 1079 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1080 emit_alu(nfp_prog, imm_b(nfp_prog), 1081 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1082 or2 = imm_b(nfp_prog); 1083 } 1084 1085 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2); 1086 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1087 1088 return 0; 1089 } 1090 1091 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1092 { 1093 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false); 1094 } 1095 1096 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1097 { 1098 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true); 1099 } 1100 1101 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1102 { 1103 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false); 1104 } 1105 1106 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1107 { 1108 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true); 1109 } 1110 1111 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1112 { 1113 const struct bpf_insn *insn = &meta->insn; 1114 u64 imm = insn->imm; /* sign extend */ 1115 swreg tmp_reg; 1116 1117 if (insn->off < 0) /* TODO */ 1118 return -EOPNOTSUPP; 1119 1120 if (!imm) { 1121 meta->skip = true; 1122 return 0; 1123 } 1124 1125 if (imm & ~0U) { 1126 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1127 emit_alu(nfp_prog, reg_none(), 1128 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg); 1129 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1130 } 1131 1132 if (imm >> 32) { 1133 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1134 emit_alu(nfp_prog, reg_none(), 1135 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg); 1136 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1137 } 1138 1139 return 0; 1140 } 1141 1142 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1143 { 1144 const struct bpf_insn *insn = &meta->insn; 1145 u64 imm = insn->imm; /* sign extend */ 1146 swreg tmp_reg; 1147 1148 if (insn->off < 0) /* TODO */ 1149 return -EOPNOTSUPP; 1150 1151 if (!imm) { 1152 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), 1153 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); 1154 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1155 } 1156 1157 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1158 emit_alu(nfp_prog, reg_none(), 1159 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1160 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1161 1162 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1163 emit_alu(nfp_prog, reg_none(), 1164 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1165 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1166 1167 return 0; 1168 } 1169 1170 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1171 { 1172 const struct bpf_insn *insn = &meta->insn; 1173 1174 if (insn->off < 0) /* TODO */ 1175 return -EOPNOTSUPP; 1176 1177 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), 1178 ALU_OP_XOR, reg_b(insn->src_reg * 2)); 1179 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1), 1180 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1)); 1181 emit_alu(nfp_prog, reg_none(), 1182 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog)); 1183 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1184 1185 return 0; 1186 } 1187 1188 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1189 { 1190 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false); 1191 } 1192 1193 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1194 { 1195 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true); 1196 } 1197 1198 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1199 { 1200 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false); 1201 } 1202 1203 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1204 { 1205 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true); 1206 } 1207 1208 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1209 { 1210 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE); 1211 } 1212 1213 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1214 { 1215 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE); 1216 } 1217 1218 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1219 { 1220 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT); 1221 1222 return 0; 1223 } 1224 1225 static const instr_cb_t instr_cb[256] = { 1226 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64, 1227 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64, 1228 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64, 1229 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64, 1230 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64, 1231 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64, 1232 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64, 1233 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64, 1234 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64, 1235 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64, 1236 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64, 1237 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64, 1238 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64, 1239 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64, 1240 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg, 1241 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm, 1242 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg, 1243 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm, 1244 [BPF_ALU | BPF_AND | BPF_X] = and_reg, 1245 [BPF_ALU | BPF_AND | BPF_K] = and_imm, 1246 [BPF_ALU | BPF_OR | BPF_X] = or_reg, 1247 [BPF_ALU | BPF_OR | BPF_K] = or_imm, 1248 [BPF_ALU | BPF_ADD | BPF_X] = add_reg, 1249 [BPF_ALU | BPF_ADD | BPF_K] = add_imm, 1250 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg, 1251 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm, 1252 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, 1253 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8, 1254 [BPF_LD | BPF_ABS | BPF_B] = data_ld1, 1255 [BPF_LD | BPF_ABS | BPF_H] = data_ld2, 1256 [BPF_LD | BPF_ABS | BPF_W] = data_ld4, 1257 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1, 1258 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2, 1259 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4, 1260 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4, 1261 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4, 1262 [BPF_JMP | BPF_JA | BPF_K] = jump, 1263 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm, 1264 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm, 1265 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm, 1266 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm, 1267 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm, 1268 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm, 1269 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm, 1270 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg, 1271 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg, 1272 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg, 1273 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg, 1274 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg, 1275 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, 1276 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, 1277 [BPF_JMP | BPF_EXIT] = goto_out, 1278 }; 1279 1280 /* --- Misc code --- */ 1281 static void br_set_offset(u64 *instr, u16 offset) 1282 { 1283 u16 addr_lo, addr_hi; 1284 1285 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 1286 addr_hi = offset != addr_lo; 1287 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); 1288 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 1289 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); 1290 } 1291 1292 /* --- Assembler logic --- */ 1293 static int nfp_fixup_branches(struct nfp_prog *nfp_prog) 1294 { 1295 struct nfp_insn_meta *meta, *next; 1296 u32 off, br_idx; 1297 u32 idx; 1298 1299 nfp_for_each_insn_walk2(nfp_prog, meta, next) { 1300 if (meta->skip) 1301 continue; 1302 if (BPF_CLASS(meta->insn.code) != BPF_JMP) 1303 continue; 1304 1305 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1; 1306 if (!nfp_is_br(nfp_prog->prog[br_idx])) { 1307 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n", 1308 br_idx, meta->insn.code, nfp_prog->prog[br_idx]); 1309 return -ELOOP; 1310 } 1311 /* Leave special branches for later */ 1312 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx])) 1313 continue; 1314 1315 /* Find the target offset in assembler realm */ 1316 off = meta->insn.off; 1317 if (!off) { 1318 pr_err("Fixup found zero offset!!\n"); 1319 return -ELOOP; 1320 } 1321 1322 while (off && nfp_meta_has_next(nfp_prog, next)) { 1323 next = nfp_meta_next(next); 1324 off--; 1325 } 1326 if (off) { 1327 pr_err("Fixup found too large jump!! %d\n", off); 1328 return -ELOOP; 1329 } 1330 1331 if (next->skip) { 1332 pr_err("Branch landing on removed instruction!!\n"); 1333 return -ELOOP; 1334 } 1335 1336 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off); 1337 idx <= br_idx; idx++) { 1338 if (!nfp_is_br(nfp_prog->prog[idx])) 1339 continue; 1340 br_set_offset(&nfp_prog->prog[idx], next->off); 1341 } 1342 } 1343 1344 /* Fixup 'goto out's separately, they can be scattered around */ 1345 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) { 1346 enum br_special special; 1347 1348 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE) 1349 continue; 1350 1351 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]); 1352 switch (special) { 1353 case OP_BR_NORMAL: 1354 break; 1355 case OP_BR_GO_OUT: 1356 br_set_offset(&nfp_prog->prog[br_idx], 1357 nfp_prog->tgt_out); 1358 break; 1359 case OP_BR_GO_ABORT: 1360 br_set_offset(&nfp_prog->prog[br_idx], 1361 nfp_prog->tgt_abort); 1362 break; 1363 } 1364 1365 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL; 1366 } 1367 1368 return 0; 1369 } 1370 1371 static void nfp_intro(struct nfp_prog *nfp_prog) 1372 { 1373 emit_alu(nfp_prog, pkt_reg(nfp_prog), 1374 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_PKT); 1375 } 1376 1377 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog) 1378 { 1379 const u8 act2code[] = { 1380 [NN_ACT_TC_DROP] = 0x22, 1381 [NN_ACT_TC_REDIR] = 0x24 1382 }; 1383 /* Target for aborts */ 1384 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1385 wrp_immed(nfp_prog, reg_both(0), 0); 1386 1387 /* Target for normal exits */ 1388 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1389 /* Legacy TC mode: 1390 * 0 0x11 -> pass, count as stat0 1391 * -1 drop 0x22 -> drop, count as stat1 1392 * redir 0x24 -> redir, count as stat1 1393 * ife mark 0x21 -> pass, count as stat1 1394 * ife + tx 0x24 -> redir, count as stat1 1395 */ 1396 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2); 1397 emit_alu(nfp_prog, reg_a(0), 1398 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1399 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1400 1401 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1); 1402 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]), 1403 SHF_SC_L_SHF, 16); 1404 } 1405 1406 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) 1407 { 1408 /* TC direct-action mode: 1409 * 0,1 ok NOT SUPPORTED[1] 1410 * 2 drop 0x22 -> drop, count as stat1 1411 * 4,5 nuke 0x02 -> drop 1412 * 7 redir 0x44 -> redir, count as stat2 1413 * * unspec 0x11 -> pass, count as stat0 1414 * 1415 * [1] We can't support OK and RECLASSIFY because we can't tell TC 1416 * the exact decision made. We are forced to support UNSPEC 1417 * to handle aborts so that's the only one we handle for passing 1418 * packets up the stack. 1419 */ 1420 /* Target for aborts */ 1421 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1422 1423 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1424 1425 emit_alu(nfp_prog, reg_a(0), 1426 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1427 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1428 1429 /* Target for normal exits */ 1430 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1431 1432 /* if R0 > 7 jump to abort */ 1433 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0)); 1434 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1435 emit_alu(nfp_prog, reg_a(0), 1436 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1437 1438 wrp_immed(nfp_prog, reg_b(2), 0x41221211); 1439 wrp_immed(nfp_prog, reg_b(3), 0x41001211); 1440 1441 emit_shf(nfp_prog, reg_a(1), 1442 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2); 1443 1444 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1445 emit_shf(nfp_prog, reg_a(2), 1446 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1447 1448 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1449 emit_shf(nfp_prog, reg_b(2), 1450 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); 1451 1452 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1453 1454 emit_shf(nfp_prog, reg_b(2), 1455 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); 1456 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1457 } 1458 1459 static void nfp_outro_xdp(struct nfp_prog *nfp_prog) 1460 { 1461 /* XDP return codes: 1462 * 0 aborted 0x82 -> drop, count as stat3 1463 * 1 drop 0x22 -> drop, count as stat1 1464 * 2 pass 0x11 -> pass, count as stat0 1465 * 3 tx 0x44 -> redir, count as stat2 1466 * * unknown 0x82 -> drop, count as stat3 1467 */ 1468 /* Target for aborts */ 1469 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1470 1471 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1472 1473 emit_alu(nfp_prog, reg_a(0), 1474 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1475 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16); 1476 1477 /* Target for normal exits */ 1478 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1479 1480 /* if R0 > 3 jump to abort */ 1481 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0)); 1482 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1483 1484 wrp_immed(nfp_prog, reg_b(2), 0x44112282); 1485 1486 emit_shf(nfp_prog, reg_a(1), 1487 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3); 1488 1489 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1490 emit_shf(nfp_prog, reg_b(2), 1491 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1492 1493 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1494 1495 emit_alu(nfp_prog, reg_a(0), 1496 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1497 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1498 } 1499 1500 static void nfp_outro(struct nfp_prog *nfp_prog) 1501 { 1502 switch (nfp_prog->act) { 1503 case NN_ACT_DIRECT: 1504 nfp_outro_tc_da(nfp_prog); 1505 break; 1506 case NN_ACT_TC_DROP: 1507 case NN_ACT_TC_REDIR: 1508 nfp_outro_tc_legacy(nfp_prog); 1509 break; 1510 case NN_ACT_XDP: 1511 nfp_outro_xdp(nfp_prog); 1512 break; 1513 } 1514 } 1515 1516 static int nfp_translate(struct nfp_prog *nfp_prog) 1517 { 1518 struct nfp_insn_meta *meta; 1519 int err; 1520 1521 nfp_intro(nfp_prog); 1522 if (nfp_prog->error) 1523 return nfp_prog->error; 1524 1525 list_for_each_entry(meta, &nfp_prog->insns, l) { 1526 instr_cb_t cb = instr_cb[meta->insn.code]; 1527 1528 meta->off = nfp_prog_current_offset(nfp_prog); 1529 1530 if (meta->skip) { 1531 nfp_prog->n_translated++; 1532 continue; 1533 } 1534 1535 if (nfp_meta_has_prev(nfp_prog, meta) && 1536 nfp_meta_prev(meta)->double_cb) 1537 cb = nfp_meta_prev(meta)->double_cb; 1538 if (!cb) 1539 return -ENOENT; 1540 err = cb(nfp_prog, meta); 1541 if (err) 1542 return err; 1543 1544 nfp_prog->n_translated++; 1545 } 1546 1547 nfp_outro(nfp_prog); 1548 if (nfp_prog->error) 1549 return nfp_prog->error; 1550 1551 return nfp_fixup_branches(nfp_prog); 1552 } 1553 1554 static int 1555 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog, 1556 unsigned int cnt) 1557 { 1558 unsigned int i; 1559 1560 for (i = 0; i < cnt; i++) { 1561 struct nfp_insn_meta *meta; 1562 1563 meta = kzalloc(sizeof(*meta), GFP_KERNEL); 1564 if (!meta) 1565 return -ENOMEM; 1566 1567 meta->insn = prog[i]; 1568 meta->n = i; 1569 1570 list_add_tail(&meta->l, &nfp_prog->insns); 1571 } 1572 1573 return 0; 1574 } 1575 1576 /* --- Optimizations --- */ 1577 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) 1578 { 1579 struct nfp_insn_meta *meta; 1580 1581 list_for_each_entry(meta, &nfp_prog->insns, l) { 1582 struct bpf_insn insn = meta->insn; 1583 1584 /* Programs converted from cBPF start with register xoring */ 1585 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) && 1586 insn.src_reg == insn.dst_reg) 1587 continue; 1588 1589 /* Programs start with R6 = R1 but we ignore the skb pointer */ 1590 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && 1591 insn.src_reg == 1 && insn.dst_reg == 6) 1592 meta->skip = true; 1593 1594 /* Return as soon as something doesn't match */ 1595 if (!meta->skip) 1596 return; 1597 } 1598 } 1599 1600 /* Try to rename registers so that program uses only low ones */ 1601 static int nfp_bpf_opt_reg_rename(struct nfp_prog *nfp_prog) 1602 { 1603 bool reg_used[MAX_BPF_REG] = {}; 1604 u8 tgt_reg[MAX_BPF_REG] = {}; 1605 struct nfp_insn_meta *meta; 1606 unsigned int i, j; 1607 1608 list_for_each_entry(meta, &nfp_prog->insns, l) { 1609 if (meta->skip) 1610 continue; 1611 1612 reg_used[meta->insn.src_reg] = true; 1613 reg_used[meta->insn.dst_reg] = true; 1614 } 1615 1616 for (i = 0, j = 0; i < ARRAY_SIZE(tgt_reg); i++) { 1617 if (!reg_used[i]) 1618 continue; 1619 1620 tgt_reg[i] = j++; 1621 } 1622 nfp_prog->num_regs = j; 1623 1624 list_for_each_entry(meta, &nfp_prog->insns, l) { 1625 meta->insn.src_reg = tgt_reg[meta->insn.src_reg]; 1626 meta->insn.dst_reg = tgt_reg[meta->insn.dst_reg]; 1627 } 1628 1629 return 0; 1630 } 1631 1632 /* Remove masking after load since our load guarantees this is not needed */ 1633 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) 1634 { 1635 struct nfp_insn_meta *meta1, *meta2; 1636 const s32 exp_mask[] = { 1637 [BPF_B] = 0x000000ffU, 1638 [BPF_H] = 0x0000ffffU, 1639 [BPF_W] = 0xffffffffU, 1640 }; 1641 1642 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 1643 struct bpf_insn insn, next; 1644 1645 insn = meta1->insn; 1646 next = meta2->insn; 1647 1648 if (BPF_CLASS(insn.code) != BPF_LD) 1649 continue; 1650 if (BPF_MODE(insn.code) != BPF_ABS && 1651 BPF_MODE(insn.code) != BPF_IND) 1652 continue; 1653 1654 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K)) 1655 continue; 1656 1657 if (!exp_mask[BPF_SIZE(insn.code)]) 1658 continue; 1659 if (exp_mask[BPF_SIZE(insn.code)] != next.imm) 1660 continue; 1661 1662 if (next.src_reg || next.dst_reg) 1663 continue; 1664 1665 meta2->skip = true; 1666 } 1667 } 1668 1669 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) 1670 { 1671 struct nfp_insn_meta *meta1, *meta2, *meta3; 1672 1673 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) { 1674 struct bpf_insn insn, next1, next2; 1675 1676 insn = meta1->insn; 1677 next1 = meta2->insn; 1678 next2 = meta3->insn; 1679 1680 if (BPF_CLASS(insn.code) != BPF_LD) 1681 continue; 1682 if (BPF_MODE(insn.code) != BPF_ABS && 1683 BPF_MODE(insn.code) != BPF_IND) 1684 continue; 1685 if (BPF_SIZE(insn.code) != BPF_W) 1686 continue; 1687 1688 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) && 1689 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) && 1690 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) && 1691 next2.code == (BPF_LSH | BPF_K | BPF_ALU64))) 1692 continue; 1693 1694 if (next1.src_reg || next1.dst_reg || 1695 next2.src_reg || next2.dst_reg) 1696 continue; 1697 1698 if (next1.imm != 0x20 || next2.imm != 0x20) 1699 continue; 1700 1701 meta2->skip = true; 1702 meta3->skip = true; 1703 } 1704 } 1705 1706 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) 1707 { 1708 int ret; 1709 1710 nfp_bpf_opt_reg_init(nfp_prog); 1711 1712 ret = nfp_bpf_opt_reg_rename(nfp_prog); 1713 if (ret) 1714 return ret; 1715 1716 nfp_bpf_opt_ld_mask(nfp_prog); 1717 nfp_bpf_opt_ld_shift(nfp_prog); 1718 1719 return 0; 1720 } 1721 1722 /** 1723 * nfp_bpf_jit() - translate BPF code into NFP assembly 1724 * @filter: kernel BPF filter struct 1725 * @prog_mem: memory to store assembler instructions 1726 * @act: action attached to this eBPF program 1727 * @prog_start: offset of the first instruction when loaded 1728 * @prog_done: where to jump on exit 1729 * @prog_sz: size of @prog_mem in instructions 1730 * @res: achieved parameters of translation results 1731 */ 1732 int 1733 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, 1734 enum nfp_bpf_action_type act, 1735 unsigned int prog_start, unsigned int prog_done, 1736 unsigned int prog_sz, struct nfp_bpf_result *res) 1737 { 1738 struct nfp_prog *nfp_prog; 1739 int ret; 1740 1741 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL); 1742 if (!nfp_prog) 1743 return -ENOMEM; 1744 1745 INIT_LIST_HEAD(&nfp_prog->insns); 1746 nfp_prog->act = act; 1747 nfp_prog->start_off = prog_start; 1748 nfp_prog->tgt_done = prog_done; 1749 1750 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len); 1751 if (ret) 1752 goto out; 1753 1754 ret = nfp_prog_verify(nfp_prog, filter); 1755 if (ret) 1756 goto out; 1757 1758 ret = nfp_bpf_optimize(nfp_prog); 1759 if (ret) 1760 goto out; 1761 1762 if (nfp_prog->num_regs <= 7) 1763 nfp_prog->regs_per_thread = 16; 1764 else 1765 nfp_prog->regs_per_thread = 32; 1766 1767 nfp_prog->prog = prog_mem; 1768 nfp_prog->__prog_alloc_len = prog_sz; 1769 1770 ret = nfp_translate(nfp_prog); 1771 if (ret) { 1772 pr_err("Translation failed with error %d (translated: %u)\n", 1773 ret, nfp_prog->n_translated); 1774 ret = -EINVAL; 1775 } 1776 1777 res->n_instr = nfp_prog->prog_len; 1778 res->dense_mode = nfp_prog->num_regs <= 7; 1779 out: 1780 nfp_prog_free(nfp_prog); 1781 1782 return ret; 1783 } 1784