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 if (reg.dst_lmextn || reg.src_lmextn) { 157 pr_err("cmd can't use LMextn\n"); 158 nfp_prog->error = -EFAULT; 159 return; 160 } 161 162 __emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, sync); 163 } 164 165 static void 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) 168 { 169 u16 addr_lo, addr_hi; 170 u64 insn; 171 172 addr_lo = addr & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 173 addr_hi = addr != addr_lo; 174 175 insn = OP_BR_BASE | 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); 182 183 nfp_prog_push(nfp_prog, insn); 184 } 185 186 static void emit_br_def(struct nfp_prog *nfp_prog, u16 addr, u8 defer) 187 { 188 if (defer > 2) { 189 pr_err("BUG: branch defer out of bounds %d\n", defer); 190 nfp_prog->error = -EFAULT; 191 return; 192 } 193 __emit_br(nfp_prog, BR_UNC, BR_EV_PIP_UNCOND, BR_CSS_NONE, addr, defer); 194 } 195 196 static void 197 emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer) 198 { 199 __emit_br(nfp_prog, mask, 200 mask != BR_UNC ? BR_EV_PIP_COND : BR_EV_PIP_UNCOND, 201 BR_CSS_NONE, addr, defer); 202 } 203 204 static void 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) 207 { 208 u16 addr_lo, addr_hi; 209 u64 insn; 210 211 addr_lo = addr & (OP_BB_ADDR_LO >> __bf_shf(OP_BB_ADDR_LO)); 212 addr_hi = addr != addr_lo; 213 214 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); 224 225 nfp_prog_push(nfp_prog, insn); 226 } 227 228 static void 229 emit_br_byte_neq(struct nfp_prog *nfp_prog, 230 swreg src, u8 imm, u8 byte, u16 addr, u8 defer) 231 { 232 struct nfp_insn_re_regs reg; 233 int err; 234 235 err = swreg_to_restricted(reg_none(), src, reg_imm(imm), ®, true); 236 if (err) { 237 nfp_prog->error = err; 238 return; 239 } 240 241 __emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr, 242 defer, reg.src_lmextn); 243 } 244 245 static void 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) 250 { 251 u64 insn; 252 253 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); 263 264 nfp_prog_push(nfp_prog, insn); 265 } 266 267 static void 268 emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm, 269 enum immed_width width, bool invert, enum immed_shift shift) 270 { 271 struct nfp_insn_ur_regs reg; 272 int err; 273 274 if (swreg_type(dst) == NN_REG_IMM) { 275 nfp_prog->error = -EFAULT; 276 return; 277 } 278 279 err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), ®); 280 if (err) { 281 nfp_prog->error = err; 282 return; 283 } 284 285 __emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width, 286 invert, shift, reg.wr_both, 287 reg.dst_lmextn, reg.src_lmextn); 288 } 289 290 static void 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) 295 { 296 u64 insn; 297 298 if (!FIELD_FIT(OP_SHF_SHIFT, shift)) { 299 nfp_prog->error = -EFAULT; 300 return; 301 } 302 303 if (sc == SHF_SC_L_SHF) 304 shift = 32 - shift; 305 306 insn = OP_SHF_BASE | 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); 319 320 nfp_prog_push(nfp_prog, insn); 321 } 322 323 static void 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) 326 { 327 struct nfp_insn_re_regs reg; 328 int err; 329 330 err = swreg_to_restricted(dst, lreg, rreg, ®, true); 331 if (err) { 332 nfp_prog->error = err; 333 return; 334 } 335 336 __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); 339 } 340 341 static void 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) 345 { 346 u64 insn; 347 348 insn = OP_ALU_BASE | 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); 358 359 nfp_prog_push(nfp_prog, insn); 360 } 361 362 static void 363 emit_alu(struct nfp_prog *nfp_prog, swreg dst, 364 swreg lreg, enum alu_op op, swreg rreg) 365 { 366 struct nfp_insn_ur_regs reg; 367 int err; 368 369 err = swreg_to_unrestricted(dst, lreg, rreg, ®); 370 if (err) { 371 nfp_prog->error = err; 372 return; 373 } 374 375 __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); 378 } 379 380 static void 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) 385 { 386 u64 insn; 387 388 insn = OP_LDF_BASE | 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); 400 401 nfp_prog_push(nfp_prog, insn); 402 } 403 404 static void 405 emit_ld_field_any(struct nfp_prog *nfp_prog, enum shf_sc sc, u8 shift, 406 swreg dst, u8 bmask, swreg src, bool zero) 407 { 408 struct nfp_insn_re_regs reg; 409 int err; 410 411 /* Note: ld_field is special as it uses one of the src regs as dst */ 412 err = swreg_to_restricted(dst, dst, src, ®, true); 413 if (err) { 414 nfp_prog->error = err; 415 return; 416 } 417 418 __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); 421 } 422 423 static void 424 emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src, 425 enum shf_sc sc, u8 shift) 426 { 427 emit_ld_field_any(nfp_prog, sc, shift, dst, bmask, src, false); 428 } 429 430 static void emit_nop(struct nfp_prog *nfp_prog) 431 { 432 __emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0); 433 } 434 435 /* --- Wrappers --- */ 436 static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift) 437 { 438 if (!(imm & 0xffff0000)) { 439 *val = imm; 440 *shift = IMMED_SHIFT_0B; 441 } else if (!(imm & 0xff0000ff)) { 442 *val = imm >> 8; 443 *shift = IMMED_SHIFT_1B; 444 } else if (!(imm & 0x0000ffff)) { 445 *val = imm >> 16; 446 *shift = IMMED_SHIFT_2B; 447 } else { 448 return false; 449 } 450 451 return true; 452 } 453 454 static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm) 455 { 456 enum immed_shift shift; 457 u16 val; 458 459 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); 463 } else { 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); 468 } 469 } 470 471 /* 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. 474 */ 475 static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 476 { 477 if (FIELD_FIT(UR_REG_IMM_MAX, imm)) 478 return reg_imm(imm); 479 480 wrp_immed(nfp_prog, tmp_reg, imm); 481 return tmp_reg; 482 } 483 484 /* 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. 487 */ 488 static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 489 { 490 if (FIELD_FIT(RE_REG_IMM_MAX, imm)) 491 return reg_imm(imm); 492 493 wrp_immed(nfp_prog, tmp_reg, imm); 494 return tmp_reg; 495 } 496 497 static void 498 wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask, 499 enum br_special special) 500 { 501 emit_br(nfp_prog, mask, 0, 0); 502 503 nfp_prog->prog[nfp_prog->prog_len - 1] |= 504 FIELD_PREP(OP_BR_SPECIAL, special); 505 } 506 507 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src) 508 { 509 emit_alu(nfp_prog, reg_both(dst), reg_none(), ALU_OP_NONE, reg_b(src)); 510 } 511 512 static int 513 construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset, 514 u16 src, bool src_valid, u8 size) 515 { 516 unsigned int i; 517 u16 shift, sz; 518 swreg tmp_reg; 519 520 /* We load the value from the address indicated in @offset and then 521 * shift out the data we don't need. Note: this is big endian! 522 */ 523 sz = size < 4 ? 4 : size; 524 shift = size < 4 ? 4 - size : 0; 525 526 if (src_valid) { 527 /* Calculate the true offset (src_reg + imm) */ 528 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 529 emit_alu(nfp_prog, imm_both(nfp_prog), 530 reg_a(src), ALU_OP_ADD, tmp_reg); 531 /* Check packet length (size guaranteed to fit b/c it's u8) */ 532 emit_alu(nfp_prog, imm_a(nfp_prog), 533 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size)); 534 emit_alu(nfp_prog, reg_none(), 535 plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog)); 536 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 537 /* Load data */ 538 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 539 pptr_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true); 540 } else { 541 /* Check packet length */ 542 tmp_reg = ur_load_imm_any(nfp_prog, offset + size, 543 imm_a(nfp_prog)); 544 emit_alu(nfp_prog, reg_none(), 545 plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg); 546 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 547 /* Load data */ 548 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 549 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 550 pptr_reg(nfp_prog), tmp_reg, sz - 1, true); 551 } 552 553 i = 0; 554 if (shift) 555 emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE, 556 reg_xfer(0), SHF_SC_R_SHF, shift * 8); 557 else 558 for (; i * 4 < size; i++) 559 emit_alu(nfp_prog, reg_both(i), 560 reg_none(), ALU_OP_NONE, reg_xfer(i)); 561 562 if (i < 2) 563 wrp_immed(nfp_prog, reg_both(1), 0); 564 565 return 0; 566 } 567 568 static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size) 569 { 570 return construct_data_ind_ld(nfp_prog, offset, 0, false, size); 571 } 572 573 static void 574 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm) 575 { 576 swreg tmp_reg; 577 578 if (alu_op == ALU_OP_AND) { 579 if (!imm) 580 wrp_immed(nfp_prog, reg_both(dst), 0); 581 if (!imm || !~imm) 582 return; 583 } 584 if (alu_op == ALU_OP_OR) { 585 if (!~imm) 586 wrp_immed(nfp_prog, reg_both(dst), ~0U); 587 if (!imm || !~imm) 588 return; 589 } 590 if (alu_op == ALU_OP_XOR) { 591 if (!~imm) 592 emit_alu(nfp_prog, reg_both(dst), reg_none(), 593 ALU_OP_NEG, reg_b(dst)); 594 if (!imm || !~imm) 595 return; 596 } 597 598 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 599 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg); 600 } 601 602 static int 603 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 604 enum alu_op alu_op, bool skip) 605 { 606 const struct bpf_insn *insn = &meta->insn; 607 u64 imm = insn->imm; /* sign extend */ 608 609 if (skip) { 610 meta->skip = true; 611 return 0; 612 } 613 614 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U); 615 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32); 616 617 return 0; 618 } 619 620 static int 621 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 622 enum alu_op alu_op) 623 { 624 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 625 626 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 627 emit_alu(nfp_prog, reg_both(dst + 1), 628 reg_a(dst + 1), alu_op, reg_b(src + 1)); 629 630 return 0; 631 } 632 633 static int 634 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 635 enum alu_op alu_op, bool skip) 636 { 637 const struct bpf_insn *insn = &meta->insn; 638 639 if (skip) { 640 meta->skip = true; 641 return 0; 642 } 643 644 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm); 645 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 646 647 return 0; 648 } 649 650 static int 651 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 652 enum alu_op alu_op) 653 { 654 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 655 656 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 657 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 658 659 return 0; 660 } 661 662 static void 663 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src, 664 enum br_mask br_mask, u16 off) 665 { 666 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src)); 667 emit_br(nfp_prog, br_mask, off, 0); 668 } 669 670 static int 671 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 672 enum alu_op alu_op, enum br_mask br_mask) 673 { 674 const struct bpf_insn *insn = &meta->insn; 675 676 if (insn->off < 0) /* TODO */ 677 return -EOPNOTSUPP; 678 679 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op, 680 insn->src_reg * 2, br_mask, insn->off); 681 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, 682 insn->src_reg * 2 + 1, br_mask, insn->off); 683 684 return 0; 685 } 686 687 static int 688 wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 689 enum br_mask br_mask, bool swap) 690 { 691 const struct bpf_insn *insn = &meta->insn; 692 u64 imm = insn->imm; /* sign extend */ 693 u8 reg = insn->dst_reg * 2; 694 swreg tmp_reg; 695 696 if (insn->off < 0) /* TODO */ 697 return -EOPNOTSUPP; 698 699 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 700 if (!swap) 701 emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg); 702 else 703 emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg)); 704 705 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 706 if (!swap) 707 emit_alu(nfp_prog, reg_none(), 708 reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg); 709 else 710 emit_alu(nfp_prog, reg_none(), 711 tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1)); 712 713 emit_br(nfp_prog, br_mask, insn->off, 0); 714 715 return 0; 716 } 717 718 static int 719 wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 720 enum br_mask br_mask, bool swap) 721 { 722 const struct bpf_insn *insn = &meta->insn; 723 u8 areg = insn->src_reg * 2, breg = insn->dst_reg * 2; 724 725 if (insn->off < 0) /* TODO */ 726 return -EOPNOTSUPP; 727 728 if (swap) { 729 areg ^= breg; 730 breg ^= areg; 731 areg ^= breg; 732 } 733 734 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); 735 emit_alu(nfp_prog, reg_none(), 736 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); 737 emit_br(nfp_prog, br_mask, insn->off, 0); 738 739 return 0; 740 } 741 742 /* --- Callbacks --- */ 743 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 744 { 745 const struct bpf_insn *insn = &meta->insn; 746 747 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 748 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1); 749 750 return 0; 751 } 752 753 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 754 { 755 u64 imm = meta->insn.imm; /* sign extend */ 756 757 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U); 758 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32); 759 760 return 0; 761 } 762 763 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 764 { 765 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR); 766 } 767 768 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 769 { 770 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); 771 } 772 773 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 774 { 775 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND); 776 } 777 778 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 779 { 780 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 781 } 782 783 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 784 { 785 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR); 786 } 787 788 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 789 { 790 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 791 } 792 793 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 794 { 795 const struct bpf_insn *insn = &meta->insn; 796 797 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 798 reg_a(insn->dst_reg * 2), ALU_OP_ADD, 799 reg_b(insn->src_reg * 2)); 800 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 801 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C, 802 reg_b(insn->src_reg * 2 + 1)); 803 804 return 0; 805 } 806 807 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 808 { 809 const struct bpf_insn *insn = &meta->insn; 810 u64 imm = insn->imm; /* sign extend */ 811 812 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U); 813 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32); 814 815 return 0; 816 } 817 818 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 819 { 820 const struct bpf_insn *insn = &meta->insn; 821 822 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 823 reg_a(insn->dst_reg * 2), ALU_OP_SUB, 824 reg_b(insn->src_reg * 2)); 825 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 826 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C, 827 reg_b(insn->src_reg * 2 + 1)); 828 829 return 0; 830 } 831 832 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 833 { 834 const struct bpf_insn *insn = &meta->insn; 835 u64 imm = insn->imm; /* sign extend */ 836 837 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U); 838 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32); 839 840 return 0; 841 } 842 843 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 844 { 845 const struct bpf_insn *insn = &meta->insn; 846 u8 dst = insn->dst_reg * 2; 847 848 if (insn->imm < 32) { 849 emit_shf(nfp_prog, reg_both(dst + 1), 850 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 851 SHF_SC_R_DSHF, 32 - insn->imm); 852 emit_shf(nfp_prog, reg_both(dst), 853 reg_none(), SHF_OP_NONE, reg_b(dst), 854 SHF_SC_L_SHF, insn->imm); 855 } else if (insn->imm == 32) { 856 wrp_reg_mov(nfp_prog, dst + 1, dst); 857 wrp_immed(nfp_prog, reg_both(dst), 0); 858 } else if (insn->imm > 32) { 859 emit_shf(nfp_prog, reg_both(dst + 1), 860 reg_none(), SHF_OP_NONE, reg_b(dst), 861 SHF_SC_L_SHF, insn->imm - 32); 862 wrp_immed(nfp_prog, reg_both(dst), 0); 863 } 864 865 return 0; 866 } 867 868 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 869 { 870 const struct bpf_insn *insn = &meta->insn; 871 u8 dst = insn->dst_reg * 2; 872 873 if (insn->imm < 32) { 874 emit_shf(nfp_prog, reg_both(dst), 875 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 876 SHF_SC_R_DSHF, insn->imm); 877 emit_shf(nfp_prog, reg_both(dst + 1), 878 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 879 SHF_SC_R_SHF, insn->imm); 880 } else if (insn->imm == 32) { 881 wrp_reg_mov(nfp_prog, dst, dst + 1); 882 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 883 } else if (insn->imm > 32) { 884 emit_shf(nfp_prog, reg_both(dst), 885 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 886 SHF_SC_R_SHF, insn->imm - 32); 887 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 888 } 889 890 return 0; 891 } 892 893 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 894 { 895 const struct bpf_insn *insn = &meta->insn; 896 897 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 898 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 899 900 return 0; 901 } 902 903 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 904 { 905 const struct bpf_insn *insn = &meta->insn; 906 907 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 908 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 909 910 return 0; 911 } 912 913 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 914 { 915 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR); 916 } 917 918 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 919 { 920 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm); 921 } 922 923 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 924 { 925 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND); 926 } 927 928 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 929 { 930 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 931 } 932 933 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 934 { 935 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR); 936 } 937 938 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 939 { 940 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 941 } 942 943 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 944 { 945 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD); 946 } 947 948 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 949 { 950 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm); 951 } 952 953 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 954 { 955 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB); 956 } 957 958 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 959 { 960 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm); 961 } 962 963 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 964 { 965 const struct bpf_insn *insn = &meta->insn; 966 967 if (!insn->imm) 968 return 1; /* TODO: zero shift means indirect */ 969 970 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), 971 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), 972 SHF_SC_L_SHF, insn->imm); 973 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 974 975 return 0; 976 } 977 978 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 979 { 980 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1), 981 meta->insn.imm); 982 983 return 0; 984 } 985 986 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 987 { 988 const struct bpf_insn *insn = &meta->insn; 989 990 meta->double_cb = imm_ld8_part2; 991 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 992 993 return 0; 994 } 995 996 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 997 { 998 return construct_data_ld(nfp_prog, meta->insn.imm, 1); 999 } 1000 1001 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1002 { 1003 return construct_data_ld(nfp_prog, meta->insn.imm, 2); 1004 } 1005 1006 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1007 { 1008 return construct_data_ld(nfp_prog, meta->insn.imm, 4); 1009 } 1010 1011 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1012 { 1013 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1014 meta->insn.src_reg * 2, true, 1); 1015 } 1016 1017 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1018 { 1019 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1020 meta->insn.src_reg * 2, true, 2); 1021 } 1022 1023 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1024 { 1025 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1026 meta->insn.src_reg * 2, true, 4); 1027 } 1028 1029 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1030 { 1031 if (meta->insn.off == offsetof(struct sk_buff, len)) 1032 emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2), 1033 reg_none(), ALU_OP_NONE, plen_reg(nfp_prog)); 1034 else 1035 return -EOPNOTSUPP; 1036 1037 return 0; 1038 } 1039 1040 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1041 { 1042 swreg dst = reg_both(meta->insn.dst_reg * 2); 1043 1044 if (meta->insn.off != offsetof(struct xdp_md, data) && 1045 meta->insn.off != offsetof(struct xdp_md, data_end)) 1046 return -EOPNOTSUPP; 1047 1048 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, pptr_reg(nfp_prog)); 1049 1050 if (meta->insn.off == offsetof(struct xdp_md, data)) 1051 return 0; 1052 1053 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, plen_reg(nfp_prog)); 1054 1055 return 0; 1056 } 1057 1058 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1059 { 1060 int ret; 1061 1062 if (nfp_prog->act == NN_ACT_XDP) 1063 ret = mem_ldx4_xdp(nfp_prog, meta); 1064 else 1065 ret = mem_ldx4_skb(nfp_prog, meta); 1066 1067 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 1068 1069 return ret; 1070 } 1071 1072 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1073 { 1074 return -EOPNOTSUPP; 1075 } 1076 1077 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1078 { 1079 return -EOPNOTSUPP; 1080 } 1081 1082 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1083 { 1084 if (nfp_prog->act == NN_ACT_XDP) 1085 return mem_stx4_xdp(nfp_prog, meta); 1086 return mem_stx4_skb(nfp_prog, meta); 1087 } 1088 1089 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1090 { 1091 if (meta->insn.off < 0) /* TODO */ 1092 return -EOPNOTSUPP; 1093 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0); 1094 1095 return 0; 1096 } 1097 1098 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1099 { 1100 const struct bpf_insn *insn = &meta->insn; 1101 u64 imm = insn->imm; /* sign extend */ 1102 swreg or1, or2, tmp_reg; 1103 1104 or1 = reg_a(insn->dst_reg * 2); 1105 or2 = reg_b(insn->dst_reg * 2 + 1); 1106 1107 if (insn->off < 0) /* TODO */ 1108 return -EOPNOTSUPP; 1109 1110 if (imm & ~0U) { 1111 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1112 emit_alu(nfp_prog, imm_a(nfp_prog), 1113 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1114 or1 = imm_a(nfp_prog); 1115 } 1116 1117 if (imm >> 32) { 1118 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1119 emit_alu(nfp_prog, imm_b(nfp_prog), 1120 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1121 or2 = imm_b(nfp_prog); 1122 } 1123 1124 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2); 1125 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1126 1127 return 0; 1128 } 1129 1130 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1131 { 1132 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false); 1133 } 1134 1135 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1136 { 1137 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true); 1138 } 1139 1140 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1141 { 1142 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false); 1143 } 1144 1145 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1146 { 1147 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true); 1148 } 1149 1150 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1151 { 1152 const struct bpf_insn *insn = &meta->insn; 1153 u64 imm = insn->imm; /* sign extend */ 1154 swreg tmp_reg; 1155 1156 if (insn->off < 0) /* TODO */ 1157 return -EOPNOTSUPP; 1158 1159 if (!imm) { 1160 meta->skip = true; 1161 return 0; 1162 } 1163 1164 if (imm & ~0U) { 1165 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1166 emit_alu(nfp_prog, reg_none(), 1167 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg); 1168 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1169 } 1170 1171 if (imm >> 32) { 1172 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1173 emit_alu(nfp_prog, reg_none(), 1174 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg); 1175 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1176 } 1177 1178 return 0; 1179 } 1180 1181 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1182 { 1183 const struct bpf_insn *insn = &meta->insn; 1184 u64 imm = insn->imm; /* sign extend */ 1185 swreg tmp_reg; 1186 1187 if (insn->off < 0) /* TODO */ 1188 return -EOPNOTSUPP; 1189 1190 if (!imm) { 1191 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), 1192 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); 1193 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1194 } 1195 1196 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1197 emit_alu(nfp_prog, reg_none(), 1198 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1199 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1200 1201 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1202 emit_alu(nfp_prog, reg_none(), 1203 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1204 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1205 1206 return 0; 1207 } 1208 1209 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1210 { 1211 const struct bpf_insn *insn = &meta->insn; 1212 1213 if (insn->off < 0) /* TODO */ 1214 return -EOPNOTSUPP; 1215 1216 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), 1217 ALU_OP_XOR, reg_b(insn->src_reg * 2)); 1218 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1), 1219 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1)); 1220 emit_alu(nfp_prog, reg_none(), 1221 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog)); 1222 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1223 1224 return 0; 1225 } 1226 1227 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1228 { 1229 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false); 1230 } 1231 1232 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1233 { 1234 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true); 1235 } 1236 1237 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1238 { 1239 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false); 1240 } 1241 1242 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1243 { 1244 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true); 1245 } 1246 1247 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1248 { 1249 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE); 1250 } 1251 1252 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1253 { 1254 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE); 1255 } 1256 1257 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1258 { 1259 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT); 1260 1261 return 0; 1262 } 1263 1264 static const instr_cb_t instr_cb[256] = { 1265 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64, 1266 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64, 1267 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64, 1268 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64, 1269 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64, 1270 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64, 1271 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64, 1272 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64, 1273 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64, 1274 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64, 1275 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64, 1276 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64, 1277 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64, 1278 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64, 1279 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg, 1280 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm, 1281 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg, 1282 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm, 1283 [BPF_ALU | BPF_AND | BPF_X] = and_reg, 1284 [BPF_ALU | BPF_AND | BPF_K] = and_imm, 1285 [BPF_ALU | BPF_OR | BPF_X] = or_reg, 1286 [BPF_ALU | BPF_OR | BPF_K] = or_imm, 1287 [BPF_ALU | BPF_ADD | BPF_X] = add_reg, 1288 [BPF_ALU | BPF_ADD | BPF_K] = add_imm, 1289 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg, 1290 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm, 1291 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, 1292 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8, 1293 [BPF_LD | BPF_ABS | BPF_B] = data_ld1, 1294 [BPF_LD | BPF_ABS | BPF_H] = data_ld2, 1295 [BPF_LD | BPF_ABS | BPF_W] = data_ld4, 1296 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1, 1297 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2, 1298 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4, 1299 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4, 1300 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4, 1301 [BPF_JMP | BPF_JA | BPF_K] = jump, 1302 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm, 1303 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm, 1304 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm, 1305 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm, 1306 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm, 1307 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm, 1308 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm, 1309 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg, 1310 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg, 1311 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg, 1312 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg, 1313 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg, 1314 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, 1315 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, 1316 [BPF_JMP | BPF_EXIT] = goto_out, 1317 }; 1318 1319 /* --- Misc code --- */ 1320 static void br_set_offset(u64 *instr, u16 offset) 1321 { 1322 u16 addr_lo, addr_hi; 1323 1324 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 1325 addr_hi = offset != addr_lo; 1326 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); 1327 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 1328 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); 1329 } 1330 1331 /* --- Assembler logic --- */ 1332 static int nfp_fixup_branches(struct nfp_prog *nfp_prog) 1333 { 1334 struct nfp_insn_meta *meta, *next; 1335 u32 off, br_idx; 1336 u32 idx; 1337 1338 nfp_for_each_insn_walk2(nfp_prog, meta, next) { 1339 if (meta->skip) 1340 continue; 1341 if (BPF_CLASS(meta->insn.code) != BPF_JMP) 1342 continue; 1343 1344 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1; 1345 if (!nfp_is_br(nfp_prog->prog[br_idx])) { 1346 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n", 1347 br_idx, meta->insn.code, nfp_prog->prog[br_idx]); 1348 return -ELOOP; 1349 } 1350 /* Leave special branches for later */ 1351 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx])) 1352 continue; 1353 1354 /* Find the target offset in assembler realm */ 1355 off = meta->insn.off; 1356 if (!off) { 1357 pr_err("Fixup found zero offset!!\n"); 1358 return -ELOOP; 1359 } 1360 1361 while (off && nfp_meta_has_next(nfp_prog, next)) { 1362 next = nfp_meta_next(next); 1363 off--; 1364 } 1365 if (off) { 1366 pr_err("Fixup found too large jump!! %d\n", off); 1367 return -ELOOP; 1368 } 1369 1370 if (next->skip) { 1371 pr_err("Branch landing on removed instruction!!\n"); 1372 return -ELOOP; 1373 } 1374 1375 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off); 1376 idx <= br_idx; idx++) { 1377 if (!nfp_is_br(nfp_prog->prog[idx])) 1378 continue; 1379 br_set_offset(&nfp_prog->prog[idx], next->off); 1380 } 1381 } 1382 1383 /* Fixup 'goto out's separately, they can be scattered around */ 1384 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) { 1385 enum br_special special; 1386 1387 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE) 1388 continue; 1389 1390 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]); 1391 switch (special) { 1392 case OP_BR_NORMAL: 1393 break; 1394 case OP_BR_GO_OUT: 1395 br_set_offset(&nfp_prog->prog[br_idx], 1396 nfp_prog->tgt_out); 1397 break; 1398 case OP_BR_GO_ABORT: 1399 br_set_offset(&nfp_prog->prog[br_idx], 1400 nfp_prog->tgt_abort); 1401 break; 1402 } 1403 1404 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL; 1405 } 1406 1407 return 0; 1408 } 1409 1410 static void nfp_intro(struct nfp_prog *nfp_prog) 1411 { 1412 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0)); 1413 emit_alu(nfp_prog, plen_reg(nfp_prog), 1414 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog)); 1415 } 1416 1417 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog) 1418 { 1419 const u8 act2code[] = { 1420 [NN_ACT_TC_DROP] = 0x22, 1421 [NN_ACT_TC_REDIR] = 0x24 1422 }; 1423 /* Target for aborts */ 1424 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1425 wrp_immed(nfp_prog, reg_both(0), 0); 1426 1427 /* Target for normal exits */ 1428 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1429 /* Legacy TC mode: 1430 * 0 0x11 -> pass, count as stat0 1431 * -1 drop 0x22 -> drop, count as stat1 1432 * redir 0x24 -> redir, count as stat1 1433 * ife mark 0x21 -> pass, count as stat1 1434 * ife + tx 0x24 -> redir, count as stat1 1435 */ 1436 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2); 1437 emit_alu(nfp_prog, reg_a(0), 1438 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1439 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1440 1441 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1); 1442 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]), 1443 SHF_SC_L_SHF, 16); 1444 } 1445 1446 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) 1447 { 1448 /* TC direct-action mode: 1449 * 0,1 ok NOT SUPPORTED[1] 1450 * 2 drop 0x22 -> drop, count as stat1 1451 * 4,5 nuke 0x02 -> drop 1452 * 7 redir 0x44 -> redir, count as stat2 1453 * * unspec 0x11 -> pass, count as stat0 1454 * 1455 * [1] We can't support OK and RECLASSIFY because we can't tell TC 1456 * the exact decision made. We are forced to support UNSPEC 1457 * to handle aborts so that's the only one we handle for passing 1458 * packets up the stack. 1459 */ 1460 /* Target for aborts */ 1461 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1462 1463 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1464 1465 emit_alu(nfp_prog, reg_a(0), 1466 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1467 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1468 1469 /* Target for normal exits */ 1470 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1471 1472 /* if R0 > 7 jump to abort */ 1473 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0)); 1474 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1475 emit_alu(nfp_prog, reg_a(0), 1476 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1477 1478 wrp_immed(nfp_prog, reg_b(2), 0x41221211); 1479 wrp_immed(nfp_prog, reg_b(3), 0x41001211); 1480 1481 emit_shf(nfp_prog, reg_a(1), 1482 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2); 1483 1484 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1485 emit_shf(nfp_prog, reg_a(2), 1486 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1487 1488 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1489 emit_shf(nfp_prog, reg_b(2), 1490 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); 1491 1492 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1493 1494 emit_shf(nfp_prog, reg_b(2), 1495 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); 1496 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1497 } 1498 1499 static void nfp_outro_xdp(struct nfp_prog *nfp_prog) 1500 { 1501 /* XDP return codes: 1502 * 0 aborted 0x82 -> drop, count as stat3 1503 * 1 drop 0x22 -> drop, count as stat1 1504 * 2 pass 0x11 -> pass, count as stat0 1505 * 3 tx 0x44 -> redir, count as stat2 1506 * * unknown 0x82 -> drop, count as stat3 1507 */ 1508 /* Target for aborts */ 1509 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1510 1511 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1512 1513 emit_alu(nfp_prog, reg_a(0), 1514 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1515 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16); 1516 1517 /* Target for normal exits */ 1518 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1519 1520 /* if R0 > 3 jump to abort */ 1521 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0)); 1522 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1523 1524 wrp_immed(nfp_prog, reg_b(2), 0x44112282); 1525 1526 emit_shf(nfp_prog, reg_a(1), 1527 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3); 1528 1529 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1530 emit_shf(nfp_prog, reg_b(2), 1531 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1532 1533 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1534 1535 emit_alu(nfp_prog, reg_a(0), 1536 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1537 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1538 } 1539 1540 static void nfp_outro(struct nfp_prog *nfp_prog) 1541 { 1542 switch (nfp_prog->act) { 1543 case NN_ACT_DIRECT: 1544 nfp_outro_tc_da(nfp_prog); 1545 break; 1546 case NN_ACT_TC_DROP: 1547 case NN_ACT_TC_REDIR: 1548 nfp_outro_tc_legacy(nfp_prog); 1549 break; 1550 case NN_ACT_XDP: 1551 nfp_outro_xdp(nfp_prog); 1552 break; 1553 } 1554 } 1555 1556 static int nfp_translate(struct nfp_prog *nfp_prog) 1557 { 1558 struct nfp_insn_meta *meta; 1559 int i, err; 1560 1561 nfp_intro(nfp_prog); 1562 if (nfp_prog->error) 1563 return nfp_prog->error; 1564 1565 list_for_each_entry(meta, &nfp_prog->insns, l) { 1566 instr_cb_t cb = instr_cb[meta->insn.code]; 1567 1568 meta->off = nfp_prog_current_offset(nfp_prog); 1569 1570 if (meta->skip) { 1571 nfp_prog->n_translated++; 1572 continue; 1573 } 1574 1575 if (nfp_meta_has_prev(nfp_prog, meta) && 1576 nfp_meta_prev(meta)->double_cb) 1577 cb = nfp_meta_prev(meta)->double_cb; 1578 if (!cb) 1579 return -ENOENT; 1580 err = cb(nfp_prog, meta); 1581 if (err) 1582 return err; 1583 1584 nfp_prog->n_translated++; 1585 } 1586 1587 nfp_outro(nfp_prog); 1588 if (nfp_prog->error) 1589 return nfp_prog->error; 1590 1591 for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++) 1592 emit_nop(nfp_prog); 1593 if (nfp_prog->error) 1594 return nfp_prog->error; 1595 1596 return nfp_fixup_branches(nfp_prog); 1597 } 1598 1599 static int 1600 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog, 1601 unsigned int cnt) 1602 { 1603 unsigned int i; 1604 1605 for (i = 0; i < cnt; i++) { 1606 struct nfp_insn_meta *meta; 1607 1608 meta = kzalloc(sizeof(*meta), GFP_KERNEL); 1609 if (!meta) 1610 return -ENOMEM; 1611 1612 meta->insn = prog[i]; 1613 meta->n = i; 1614 1615 list_add_tail(&meta->l, &nfp_prog->insns); 1616 } 1617 1618 return 0; 1619 } 1620 1621 /* --- Optimizations --- */ 1622 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) 1623 { 1624 struct nfp_insn_meta *meta; 1625 1626 list_for_each_entry(meta, &nfp_prog->insns, l) { 1627 struct bpf_insn insn = meta->insn; 1628 1629 /* Programs converted from cBPF start with register xoring */ 1630 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) && 1631 insn.src_reg == insn.dst_reg) 1632 continue; 1633 1634 /* Programs start with R6 = R1 but we ignore the skb pointer */ 1635 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && 1636 insn.src_reg == 1 && insn.dst_reg == 6) 1637 meta->skip = true; 1638 1639 /* Return as soon as something doesn't match */ 1640 if (!meta->skip) 1641 return; 1642 } 1643 } 1644 1645 /* Remove masking after load since our load guarantees this is not needed */ 1646 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) 1647 { 1648 struct nfp_insn_meta *meta1, *meta2; 1649 const s32 exp_mask[] = { 1650 [BPF_B] = 0x000000ffU, 1651 [BPF_H] = 0x0000ffffU, 1652 [BPF_W] = 0xffffffffU, 1653 }; 1654 1655 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 1656 struct bpf_insn insn, next; 1657 1658 insn = meta1->insn; 1659 next = meta2->insn; 1660 1661 if (BPF_CLASS(insn.code) != BPF_LD) 1662 continue; 1663 if (BPF_MODE(insn.code) != BPF_ABS && 1664 BPF_MODE(insn.code) != BPF_IND) 1665 continue; 1666 1667 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K)) 1668 continue; 1669 1670 if (!exp_mask[BPF_SIZE(insn.code)]) 1671 continue; 1672 if (exp_mask[BPF_SIZE(insn.code)] != next.imm) 1673 continue; 1674 1675 if (next.src_reg || next.dst_reg) 1676 continue; 1677 1678 meta2->skip = true; 1679 } 1680 } 1681 1682 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) 1683 { 1684 struct nfp_insn_meta *meta1, *meta2, *meta3; 1685 1686 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) { 1687 struct bpf_insn insn, next1, next2; 1688 1689 insn = meta1->insn; 1690 next1 = meta2->insn; 1691 next2 = meta3->insn; 1692 1693 if (BPF_CLASS(insn.code) != BPF_LD) 1694 continue; 1695 if (BPF_MODE(insn.code) != BPF_ABS && 1696 BPF_MODE(insn.code) != BPF_IND) 1697 continue; 1698 if (BPF_SIZE(insn.code) != BPF_W) 1699 continue; 1700 1701 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) && 1702 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) && 1703 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) && 1704 next2.code == (BPF_LSH | BPF_K | BPF_ALU64))) 1705 continue; 1706 1707 if (next1.src_reg || next1.dst_reg || 1708 next2.src_reg || next2.dst_reg) 1709 continue; 1710 1711 if (next1.imm != 0x20 || next2.imm != 0x20) 1712 continue; 1713 1714 meta2->skip = true; 1715 meta3->skip = true; 1716 } 1717 } 1718 1719 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) 1720 { 1721 nfp_bpf_opt_reg_init(nfp_prog); 1722 1723 nfp_bpf_opt_ld_mask(nfp_prog); 1724 nfp_bpf_opt_ld_shift(nfp_prog); 1725 1726 return 0; 1727 } 1728 1729 static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore) 1730 { 1731 int i; 1732 1733 for (i = 0; i < nfp_prog->prog_len; i++) { 1734 int err; 1735 1736 err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]); 1737 if (err) 1738 return err; 1739 1740 nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]); 1741 1742 ustore[i] = cpu_to_le64(nfp_prog->prog[i]); 1743 } 1744 1745 return 0; 1746 } 1747 1748 /** 1749 * nfp_bpf_jit() - translate BPF code into NFP assembly 1750 * @filter: kernel BPF filter struct 1751 * @prog_mem: memory to store assembler instructions 1752 * @act: action attached to this eBPF program 1753 * @prog_start: offset of the first instruction when loaded 1754 * @prog_done: where to jump on exit 1755 * @prog_sz: size of @prog_mem in instructions 1756 * @res: achieved parameters of translation results 1757 */ 1758 int 1759 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, 1760 enum nfp_bpf_action_type act, 1761 unsigned int prog_start, unsigned int prog_done, 1762 unsigned int prog_sz, struct nfp_bpf_result *res) 1763 { 1764 struct nfp_prog *nfp_prog; 1765 int ret; 1766 1767 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL); 1768 if (!nfp_prog) 1769 return -ENOMEM; 1770 1771 INIT_LIST_HEAD(&nfp_prog->insns); 1772 nfp_prog->act = act; 1773 nfp_prog->start_off = prog_start; 1774 nfp_prog->tgt_done = prog_done; 1775 1776 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len); 1777 if (ret) 1778 goto out; 1779 1780 ret = nfp_prog_verify(nfp_prog, filter); 1781 if (ret) 1782 goto out; 1783 1784 ret = nfp_bpf_optimize(nfp_prog); 1785 if (ret) 1786 goto out; 1787 1788 nfp_prog->num_regs = MAX_BPF_REG; 1789 nfp_prog->regs_per_thread = 32; 1790 1791 nfp_prog->prog = prog_mem; 1792 nfp_prog->__prog_alloc_len = prog_sz; 1793 1794 ret = nfp_translate(nfp_prog); 1795 if (ret) { 1796 pr_err("Translation failed with error %d (translated: %u)\n", 1797 ret, nfp_prog->n_translated); 1798 ret = -EINVAL; 1799 goto out; 1800 } 1801 1802 ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem); 1803 1804 res->n_instr = nfp_prog->prog_len; 1805 res->dense_mode = false; 1806 out: 1807 nfp_prog_free(nfp_prog); 1808 1809 return ret; 1810 } 1811