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, swreg dst, u8 bmask, swreg src, 406 enum shf_sc sc, u8 shift, 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, dst, bmask, src, sc, shift, 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_mov(struct nfp_prog *nfp_prog, swreg dst, swreg src) 508 { 509 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, src); 510 } 511 512 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src) 513 { 514 wrp_mov(nfp_prog, reg_both(dst), reg_b(src)); 515 } 516 517 static int 518 construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset, 519 u16 src, bool src_valid, u8 size) 520 { 521 unsigned int i; 522 u16 shift, sz; 523 swreg tmp_reg; 524 525 /* We load the value from the address indicated in @offset and then 526 * shift out the data we don't need. Note: this is big endian! 527 */ 528 sz = size < 4 ? 4 : size; 529 shift = size < 4 ? 4 - size : 0; 530 531 if (src_valid) { 532 /* Calculate the true offset (src_reg + imm) */ 533 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 534 emit_alu(nfp_prog, imm_both(nfp_prog), 535 reg_a(src), ALU_OP_ADD, tmp_reg); 536 /* Check packet length (size guaranteed to fit b/c it's u8) */ 537 emit_alu(nfp_prog, imm_a(nfp_prog), 538 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size)); 539 emit_alu(nfp_prog, reg_none(), 540 plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog)); 541 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 542 /* Load data */ 543 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 544 pptr_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true); 545 } else { 546 /* Check packet length */ 547 tmp_reg = ur_load_imm_any(nfp_prog, offset + size, 548 imm_a(nfp_prog)); 549 emit_alu(nfp_prog, reg_none(), 550 plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg); 551 wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT); 552 /* Load data */ 553 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 554 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 555 pptr_reg(nfp_prog), tmp_reg, sz - 1, true); 556 } 557 558 i = 0; 559 if (shift) 560 emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE, 561 reg_xfer(0), SHF_SC_R_SHF, shift * 8); 562 else 563 for (; i * 4 < size; i++) 564 wrp_mov(nfp_prog, reg_both(i), reg_xfer(i)); 565 566 if (i < 2) 567 wrp_immed(nfp_prog, reg_both(1), 0); 568 569 return 0; 570 } 571 572 static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size) 573 { 574 return construct_data_ind_ld(nfp_prog, offset, 0, false, size); 575 } 576 577 static void 578 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm) 579 { 580 swreg tmp_reg; 581 582 if (alu_op == ALU_OP_AND) { 583 if (!imm) 584 wrp_immed(nfp_prog, reg_both(dst), 0); 585 if (!imm || !~imm) 586 return; 587 } 588 if (alu_op == ALU_OP_OR) { 589 if (!~imm) 590 wrp_immed(nfp_prog, reg_both(dst), ~0U); 591 if (!imm || !~imm) 592 return; 593 } 594 if (alu_op == ALU_OP_XOR) { 595 if (!~imm) 596 emit_alu(nfp_prog, reg_both(dst), reg_none(), 597 ALU_OP_NEG, reg_b(dst)); 598 if (!imm || !~imm) 599 return; 600 } 601 602 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 603 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg); 604 } 605 606 static int 607 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 608 enum alu_op alu_op, bool skip) 609 { 610 const struct bpf_insn *insn = &meta->insn; 611 u64 imm = insn->imm; /* sign extend */ 612 613 if (skip) { 614 meta->skip = true; 615 return 0; 616 } 617 618 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U); 619 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32); 620 621 return 0; 622 } 623 624 static int 625 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 626 enum alu_op alu_op) 627 { 628 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 629 630 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 631 emit_alu(nfp_prog, reg_both(dst + 1), 632 reg_a(dst + 1), alu_op, reg_b(src + 1)); 633 634 return 0; 635 } 636 637 static int 638 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 639 enum alu_op alu_op, bool skip) 640 { 641 const struct bpf_insn *insn = &meta->insn; 642 643 if (skip) { 644 meta->skip = true; 645 return 0; 646 } 647 648 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm); 649 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 650 651 return 0; 652 } 653 654 static int 655 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 656 enum alu_op alu_op) 657 { 658 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 659 660 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 661 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 662 663 return 0; 664 } 665 666 static void 667 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src, 668 enum br_mask br_mask, u16 off) 669 { 670 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src)); 671 emit_br(nfp_prog, br_mask, off, 0); 672 } 673 674 static int 675 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 676 enum alu_op alu_op, enum br_mask br_mask) 677 { 678 const struct bpf_insn *insn = &meta->insn; 679 680 if (insn->off < 0) /* TODO */ 681 return -EOPNOTSUPP; 682 683 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op, 684 insn->src_reg * 2, br_mask, insn->off); 685 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, 686 insn->src_reg * 2 + 1, br_mask, insn->off); 687 688 return 0; 689 } 690 691 static int 692 wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 693 enum br_mask br_mask, bool swap) 694 { 695 const struct bpf_insn *insn = &meta->insn; 696 u64 imm = insn->imm; /* sign extend */ 697 u8 reg = insn->dst_reg * 2; 698 swreg tmp_reg; 699 700 if (insn->off < 0) /* TODO */ 701 return -EOPNOTSUPP; 702 703 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 704 if (!swap) 705 emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg); 706 else 707 emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg)); 708 709 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 710 if (!swap) 711 emit_alu(nfp_prog, reg_none(), 712 reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg); 713 else 714 emit_alu(nfp_prog, reg_none(), 715 tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1)); 716 717 emit_br(nfp_prog, br_mask, insn->off, 0); 718 719 return 0; 720 } 721 722 static int 723 wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 724 enum br_mask br_mask, bool swap) 725 { 726 const struct bpf_insn *insn = &meta->insn; 727 u8 areg, breg; 728 729 areg = insn->dst_reg * 2; 730 breg = insn->src_reg * 2; 731 732 if (insn->off < 0) /* TODO */ 733 return -EOPNOTSUPP; 734 735 if (swap) { 736 areg ^= breg; 737 breg ^= areg; 738 areg ^= breg; 739 } 740 741 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); 742 emit_alu(nfp_prog, reg_none(), 743 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); 744 emit_br(nfp_prog, br_mask, insn->off, 0); 745 746 return 0; 747 } 748 749 /* --- Callbacks --- */ 750 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 751 { 752 const struct bpf_insn *insn = &meta->insn; 753 754 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 755 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1); 756 757 return 0; 758 } 759 760 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 761 { 762 u64 imm = meta->insn.imm; /* sign extend */ 763 764 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U); 765 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32); 766 767 return 0; 768 } 769 770 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 771 { 772 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR); 773 } 774 775 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 776 { 777 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); 778 } 779 780 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 781 { 782 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND); 783 } 784 785 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 786 { 787 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 788 } 789 790 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 791 { 792 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR); 793 } 794 795 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 796 { 797 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 798 } 799 800 static int add_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_ADD, 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_ADD_C, 809 reg_b(insn->src_reg * 2 + 1)); 810 811 return 0; 812 } 813 814 static int add_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_ADD, imm & ~0U); 820 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32); 821 822 return 0; 823 } 824 825 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 826 { 827 const struct bpf_insn *insn = &meta->insn; 828 829 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 830 reg_a(insn->dst_reg * 2), ALU_OP_SUB, 831 reg_b(insn->src_reg * 2)); 832 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 833 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C, 834 reg_b(insn->src_reg * 2 + 1)); 835 836 return 0; 837 } 838 839 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 840 { 841 const struct bpf_insn *insn = &meta->insn; 842 u64 imm = insn->imm; /* sign extend */ 843 844 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U); 845 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32); 846 847 return 0; 848 } 849 850 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 851 { 852 const struct bpf_insn *insn = &meta->insn; 853 u8 dst = insn->dst_reg * 2; 854 855 if (insn->imm < 32) { 856 emit_shf(nfp_prog, reg_both(dst + 1), 857 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 858 SHF_SC_R_DSHF, 32 - insn->imm); 859 emit_shf(nfp_prog, reg_both(dst), 860 reg_none(), SHF_OP_NONE, reg_b(dst), 861 SHF_SC_L_SHF, insn->imm); 862 } else if (insn->imm == 32) { 863 wrp_reg_mov(nfp_prog, dst + 1, dst); 864 wrp_immed(nfp_prog, reg_both(dst), 0); 865 } else if (insn->imm > 32) { 866 emit_shf(nfp_prog, reg_both(dst + 1), 867 reg_none(), SHF_OP_NONE, reg_b(dst), 868 SHF_SC_L_SHF, insn->imm - 32); 869 wrp_immed(nfp_prog, reg_both(dst), 0); 870 } 871 872 return 0; 873 } 874 875 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 876 { 877 const struct bpf_insn *insn = &meta->insn; 878 u8 dst = insn->dst_reg * 2; 879 880 if (insn->imm < 32) { 881 emit_shf(nfp_prog, reg_both(dst), 882 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 883 SHF_SC_R_DSHF, insn->imm); 884 emit_shf(nfp_prog, reg_both(dst + 1), 885 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 886 SHF_SC_R_SHF, insn->imm); 887 } else if (insn->imm == 32) { 888 wrp_reg_mov(nfp_prog, dst, dst + 1); 889 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 890 } else if (insn->imm > 32) { 891 emit_shf(nfp_prog, reg_both(dst), 892 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 893 SHF_SC_R_SHF, insn->imm - 32); 894 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 895 } 896 897 return 0; 898 } 899 900 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 901 { 902 const struct bpf_insn *insn = &meta->insn; 903 904 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 905 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 906 907 return 0; 908 } 909 910 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 911 { 912 const struct bpf_insn *insn = &meta->insn; 913 914 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 915 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 916 917 return 0; 918 } 919 920 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 921 { 922 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR); 923 } 924 925 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 926 { 927 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm); 928 } 929 930 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 931 { 932 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND); 933 } 934 935 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 936 { 937 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 938 } 939 940 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 941 { 942 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR); 943 } 944 945 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 946 { 947 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 948 } 949 950 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 951 { 952 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD); 953 } 954 955 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 956 { 957 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm); 958 } 959 960 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 961 { 962 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB); 963 } 964 965 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 966 { 967 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm); 968 } 969 970 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 971 { 972 const struct bpf_insn *insn = &meta->insn; 973 974 if (!insn->imm) 975 return 1; /* TODO: zero shift means indirect */ 976 977 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), 978 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), 979 SHF_SC_L_SHF, insn->imm); 980 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 981 982 return 0; 983 } 984 985 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 986 { 987 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1), 988 meta->insn.imm); 989 990 return 0; 991 } 992 993 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 994 { 995 const struct bpf_insn *insn = &meta->insn; 996 997 meta->double_cb = imm_ld8_part2; 998 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 999 1000 return 0; 1001 } 1002 1003 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1004 { 1005 return construct_data_ld(nfp_prog, meta->insn.imm, 1); 1006 } 1007 1008 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1009 { 1010 return construct_data_ld(nfp_prog, meta->insn.imm, 2); 1011 } 1012 1013 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1014 { 1015 return construct_data_ld(nfp_prog, meta->insn.imm, 4); 1016 } 1017 1018 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1019 { 1020 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1021 meta->insn.src_reg * 2, true, 1); 1022 } 1023 1024 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1025 { 1026 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1027 meta->insn.src_reg * 2, true, 2); 1028 } 1029 1030 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1031 { 1032 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1033 meta->insn.src_reg * 2, true, 4); 1034 } 1035 1036 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1037 { 1038 if (meta->insn.off == offsetof(struct sk_buff, len)) 1039 wrp_mov(nfp_prog, 1040 reg_both(meta->insn.dst_reg * 2), plen_reg(nfp_prog)); 1041 else 1042 return -EOPNOTSUPP; 1043 1044 return 0; 1045 } 1046 1047 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1048 { 1049 swreg dst = reg_both(meta->insn.dst_reg * 2); 1050 1051 if (meta->insn.off != offsetof(struct xdp_md, data) && 1052 meta->insn.off != offsetof(struct xdp_md, data_end)) 1053 return -EOPNOTSUPP; 1054 1055 wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog)); 1056 1057 if (meta->insn.off == offsetof(struct xdp_md, data)) 1058 return 0; 1059 1060 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, plen_reg(nfp_prog)); 1061 1062 return 0; 1063 } 1064 1065 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1066 { 1067 int ret; 1068 1069 if (nfp_prog->act == NN_ACT_XDP) 1070 ret = mem_ldx4_xdp(nfp_prog, meta); 1071 else 1072 ret = mem_ldx4_skb(nfp_prog, meta); 1073 1074 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 1075 1076 return ret; 1077 } 1078 1079 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1080 { 1081 return -EOPNOTSUPP; 1082 } 1083 1084 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1085 { 1086 return -EOPNOTSUPP; 1087 } 1088 1089 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1090 { 1091 if (nfp_prog->act == NN_ACT_XDP) 1092 return mem_stx4_xdp(nfp_prog, meta); 1093 return mem_stx4_skb(nfp_prog, meta); 1094 } 1095 1096 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1097 { 1098 if (meta->insn.off < 0) /* TODO */ 1099 return -EOPNOTSUPP; 1100 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0); 1101 1102 return 0; 1103 } 1104 1105 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1106 { 1107 const struct bpf_insn *insn = &meta->insn; 1108 u64 imm = insn->imm; /* sign extend */ 1109 swreg or1, or2, tmp_reg; 1110 1111 or1 = reg_a(insn->dst_reg * 2); 1112 or2 = reg_b(insn->dst_reg * 2 + 1); 1113 1114 if (insn->off < 0) /* TODO */ 1115 return -EOPNOTSUPP; 1116 1117 if (imm & ~0U) { 1118 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1119 emit_alu(nfp_prog, imm_a(nfp_prog), 1120 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1121 or1 = imm_a(nfp_prog); 1122 } 1123 1124 if (imm >> 32) { 1125 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1126 emit_alu(nfp_prog, imm_b(nfp_prog), 1127 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1128 or2 = imm_b(nfp_prog); 1129 } 1130 1131 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2); 1132 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1133 1134 return 0; 1135 } 1136 1137 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1138 { 1139 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true); 1140 } 1141 1142 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1143 { 1144 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false); 1145 } 1146 1147 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1148 { 1149 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false); 1150 } 1151 1152 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1153 { 1154 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true); 1155 } 1156 1157 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1158 { 1159 const struct bpf_insn *insn = &meta->insn; 1160 u64 imm = insn->imm; /* sign extend */ 1161 swreg tmp_reg; 1162 1163 if (insn->off < 0) /* TODO */ 1164 return -EOPNOTSUPP; 1165 1166 if (!imm) { 1167 meta->skip = true; 1168 return 0; 1169 } 1170 1171 if (imm & ~0U) { 1172 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1173 emit_alu(nfp_prog, reg_none(), 1174 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg); 1175 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1176 } 1177 1178 if (imm >> 32) { 1179 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1180 emit_alu(nfp_prog, reg_none(), 1181 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg); 1182 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1183 } 1184 1185 return 0; 1186 } 1187 1188 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1189 { 1190 const struct bpf_insn *insn = &meta->insn; 1191 u64 imm = insn->imm; /* sign extend */ 1192 swreg tmp_reg; 1193 1194 if (insn->off < 0) /* TODO */ 1195 return -EOPNOTSUPP; 1196 1197 if (!imm) { 1198 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), 1199 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); 1200 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1201 return 0; 1202 } 1203 1204 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1205 emit_alu(nfp_prog, reg_none(), 1206 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1207 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1208 1209 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1210 emit_alu(nfp_prog, reg_none(), 1211 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1212 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1213 1214 return 0; 1215 } 1216 1217 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1218 { 1219 const struct bpf_insn *insn = &meta->insn; 1220 1221 if (insn->off < 0) /* TODO */ 1222 return -EOPNOTSUPP; 1223 1224 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), 1225 ALU_OP_XOR, reg_b(insn->src_reg * 2)); 1226 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1), 1227 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1)); 1228 emit_alu(nfp_prog, reg_none(), 1229 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog)); 1230 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1231 1232 return 0; 1233 } 1234 1235 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1236 { 1237 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true); 1238 } 1239 1240 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1241 { 1242 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false); 1243 } 1244 1245 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1246 { 1247 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false); 1248 } 1249 1250 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1251 { 1252 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true); 1253 } 1254 1255 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1256 { 1257 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE); 1258 } 1259 1260 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1261 { 1262 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE); 1263 } 1264 1265 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1266 { 1267 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT); 1268 1269 return 0; 1270 } 1271 1272 static const instr_cb_t instr_cb[256] = { 1273 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64, 1274 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64, 1275 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64, 1276 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64, 1277 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64, 1278 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64, 1279 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64, 1280 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64, 1281 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64, 1282 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64, 1283 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64, 1284 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64, 1285 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64, 1286 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64, 1287 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg, 1288 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm, 1289 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg, 1290 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm, 1291 [BPF_ALU | BPF_AND | BPF_X] = and_reg, 1292 [BPF_ALU | BPF_AND | BPF_K] = and_imm, 1293 [BPF_ALU | BPF_OR | BPF_X] = or_reg, 1294 [BPF_ALU | BPF_OR | BPF_K] = or_imm, 1295 [BPF_ALU | BPF_ADD | BPF_X] = add_reg, 1296 [BPF_ALU | BPF_ADD | BPF_K] = add_imm, 1297 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg, 1298 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm, 1299 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, 1300 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8, 1301 [BPF_LD | BPF_ABS | BPF_B] = data_ld1, 1302 [BPF_LD | BPF_ABS | BPF_H] = data_ld2, 1303 [BPF_LD | BPF_ABS | BPF_W] = data_ld4, 1304 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1, 1305 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2, 1306 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4, 1307 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4, 1308 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4, 1309 [BPF_JMP | BPF_JA | BPF_K] = jump, 1310 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm, 1311 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm, 1312 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm, 1313 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm, 1314 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm, 1315 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm, 1316 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm, 1317 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg, 1318 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg, 1319 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg, 1320 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg, 1321 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg, 1322 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, 1323 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, 1324 [BPF_JMP | BPF_EXIT] = goto_out, 1325 }; 1326 1327 /* --- Misc code --- */ 1328 static void br_set_offset(u64 *instr, u16 offset) 1329 { 1330 u16 addr_lo, addr_hi; 1331 1332 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 1333 addr_hi = offset != addr_lo; 1334 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); 1335 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 1336 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); 1337 } 1338 1339 /* --- Assembler logic --- */ 1340 static int nfp_fixup_branches(struct nfp_prog *nfp_prog) 1341 { 1342 struct nfp_insn_meta *meta, *next; 1343 u32 off, br_idx; 1344 u32 idx; 1345 1346 nfp_for_each_insn_walk2(nfp_prog, meta, next) { 1347 if (meta->skip) 1348 continue; 1349 if (BPF_CLASS(meta->insn.code) != BPF_JMP) 1350 continue; 1351 1352 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1; 1353 if (!nfp_is_br(nfp_prog->prog[br_idx])) { 1354 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n", 1355 br_idx, meta->insn.code, nfp_prog->prog[br_idx]); 1356 return -ELOOP; 1357 } 1358 /* Leave special branches for later */ 1359 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx])) 1360 continue; 1361 1362 /* Find the target offset in assembler realm */ 1363 off = meta->insn.off; 1364 if (!off) { 1365 pr_err("Fixup found zero offset!!\n"); 1366 return -ELOOP; 1367 } 1368 1369 while (off && nfp_meta_has_next(nfp_prog, next)) { 1370 next = nfp_meta_next(next); 1371 off--; 1372 } 1373 if (off) { 1374 pr_err("Fixup found too large jump!! %d\n", off); 1375 return -ELOOP; 1376 } 1377 1378 if (next->skip) { 1379 pr_err("Branch landing on removed instruction!!\n"); 1380 return -ELOOP; 1381 } 1382 1383 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off); 1384 idx <= br_idx; idx++) { 1385 if (!nfp_is_br(nfp_prog->prog[idx])) 1386 continue; 1387 br_set_offset(&nfp_prog->prog[idx], next->off); 1388 } 1389 } 1390 1391 /* Fixup 'goto out's separately, they can be scattered around */ 1392 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) { 1393 enum br_special special; 1394 1395 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE) 1396 continue; 1397 1398 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]); 1399 switch (special) { 1400 case OP_BR_NORMAL: 1401 break; 1402 case OP_BR_GO_OUT: 1403 br_set_offset(&nfp_prog->prog[br_idx], 1404 nfp_prog->tgt_out); 1405 break; 1406 case OP_BR_GO_ABORT: 1407 br_set_offset(&nfp_prog->prog[br_idx], 1408 nfp_prog->tgt_abort); 1409 break; 1410 } 1411 1412 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL; 1413 } 1414 1415 return 0; 1416 } 1417 1418 static void nfp_intro(struct nfp_prog *nfp_prog) 1419 { 1420 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0)); 1421 emit_alu(nfp_prog, plen_reg(nfp_prog), 1422 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog)); 1423 } 1424 1425 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog) 1426 { 1427 const u8 act2code[] = { 1428 [NN_ACT_TC_DROP] = 0x22, 1429 [NN_ACT_TC_REDIR] = 0x24 1430 }; 1431 /* Target for aborts */ 1432 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1433 wrp_immed(nfp_prog, reg_both(0), 0); 1434 1435 /* Target for normal exits */ 1436 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1437 /* Legacy TC mode: 1438 * 0 0x11 -> pass, count as stat0 1439 * -1 drop 0x22 -> drop, count as stat1 1440 * redir 0x24 -> redir, count as stat1 1441 * ife mark 0x21 -> pass, count as stat1 1442 * ife + tx 0x24 -> redir, count as stat1 1443 */ 1444 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2); 1445 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 1446 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1447 1448 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1); 1449 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]), 1450 SHF_SC_L_SHF, 16); 1451 } 1452 1453 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) 1454 { 1455 /* TC direct-action mode: 1456 * 0,1 ok NOT SUPPORTED[1] 1457 * 2 drop 0x22 -> drop, count as stat1 1458 * 4,5 nuke 0x02 -> drop 1459 * 7 redir 0x44 -> redir, count as stat2 1460 * * unspec 0x11 -> pass, count as stat0 1461 * 1462 * [1] We can't support OK and RECLASSIFY because we can't tell TC 1463 * the exact decision made. We are forced to support UNSPEC 1464 * to handle aborts so that's the only one we handle for passing 1465 * packets up the stack. 1466 */ 1467 /* Target for aborts */ 1468 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1469 1470 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1471 1472 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 1473 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1474 1475 /* Target for normal exits */ 1476 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1477 1478 /* if R0 > 7 jump to abort */ 1479 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0)); 1480 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1481 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 1482 1483 wrp_immed(nfp_prog, reg_b(2), 0x41221211); 1484 wrp_immed(nfp_prog, reg_b(3), 0x41001211); 1485 1486 emit_shf(nfp_prog, reg_a(1), 1487 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2); 1488 1489 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1490 emit_shf(nfp_prog, reg_a(2), 1491 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1492 1493 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1494 emit_shf(nfp_prog, reg_b(2), 1495 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); 1496 1497 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1498 1499 emit_shf(nfp_prog, reg_b(2), 1500 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); 1501 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1502 } 1503 1504 static void nfp_outro_xdp(struct nfp_prog *nfp_prog) 1505 { 1506 /* XDP return codes: 1507 * 0 aborted 0x82 -> drop, count as stat3 1508 * 1 drop 0x22 -> drop, count as stat1 1509 * 2 pass 0x11 -> pass, count as stat0 1510 * 3 tx 0x44 -> redir, count as stat2 1511 * * unknown 0x82 -> drop, count as stat3 1512 */ 1513 /* Target for aborts */ 1514 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1515 1516 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1517 1518 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 1519 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16); 1520 1521 /* Target for normal exits */ 1522 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1523 1524 /* if R0 > 3 jump to abort */ 1525 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0)); 1526 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1527 1528 wrp_immed(nfp_prog, reg_b(2), 0x44112282); 1529 1530 emit_shf(nfp_prog, reg_a(1), 1531 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3); 1532 1533 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1534 emit_shf(nfp_prog, reg_b(2), 1535 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1536 1537 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1538 1539 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 1540 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1541 } 1542 1543 static void nfp_outro(struct nfp_prog *nfp_prog) 1544 { 1545 switch (nfp_prog->act) { 1546 case NN_ACT_DIRECT: 1547 nfp_outro_tc_da(nfp_prog); 1548 break; 1549 case NN_ACT_TC_DROP: 1550 case NN_ACT_TC_REDIR: 1551 nfp_outro_tc_legacy(nfp_prog); 1552 break; 1553 case NN_ACT_XDP: 1554 nfp_outro_xdp(nfp_prog); 1555 break; 1556 } 1557 } 1558 1559 static int nfp_translate(struct nfp_prog *nfp_prog) 1560 { 1561 struct nfp_insn_meta *meta; 1562 int i, err; 1563 1564 nfp_intro(nfp_prog); 1565 if (nfp_prog->error) 1566 return nfp_prog->error; 1567 1568 list_for_each_entry(meta, &nfp_prog->insns, l) { 1569 instr_cb_t cb = instr_cb[meta->insn.code]; 1570 1571 meta->off = nfp_prog_current_offset(nfp_prog); 1572 1573 if (meta->skip) { 1574 nfp_prog->n_translated++; 1575 continue; 1576 } 1577 1578 if (nfp_meta_has_prev(nfp_prog, meta) && 1579 nfp_meta_prev(meta)->double_cb) 1580 cb = nfp_meta_prev(meta)->double_cb; 1581 if (!cb) 1582 return -ENOENT; 1583 err = cb(nfp_prog, meta); 1584 if (err) 1585 return err; 1586 1587 nfp_prog->n_translated++; 1588 } 1589 1590 nfp_outro(nfp_prog); 1591 if (nfp_prog->error) 1592 return nfp_prog->error; 1593 1594 for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++) 1595 emit_nop(nfp_prog); 1596 if (nfp_prog->error) 1597 return nfp_prog->error; 1598 1599 return nfp_fixup_branches(nfp_prog); 1600 } 1601 1602 static int 1603 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog, 1604 unsigned int cnt) 1605 { 1606 unsigned int i; 1607 1608 for (i = 0; i < cnt; i++) { 1609 struct nfp_insn_meta *meta; 1610 1611 meta = kzalloc(sizeof(*meta), GFP_KERNEL); 1612 if (!meta) 1613 return -ENOMEM; 1614 1615 meta->insn = prog[i]; 1616 meta->n = i; 1617 1618 list_add_tail(&meta->l, &nfp_prog->insns); 1619 } 1620 1621 return 0; 1622 } 1623 1624 /* --- Optimizations --- */ 1625 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) 1626 { 1627 struct nfp_insn_meta *meta; 1628 1629 list_for_each_entry(meta, &nfp_prog->insns, l) { 1630 struct bpf_insn insn = meta->insn; 1631 1632 /* Programs converted from cBPF start with register xoring */ 1633 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) && 1634 insn.src_reg == insn.dst_reg) 1635 continue; 1636 1637 /* Programs start with R6 = R1 but we ignore the skb pointer */ 1638 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && 1639 insn.src_reg == 1 && insn.dst_reg == 6) 1640 meta->skip = true; 1641 1642 /* Return as soon as something doesn't match */ 1643 if (!meta->skip) 1644 return; 1645 } 1646 } 1647 1648 /* Remove masking after load since our load guarantees this is not needed */ 1649 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) 1650 { 1651 struct nfp_insn_meta *meta1, *meta2; 1652 const s32 exp_mask[] = { 1653 [BPF_B] = 0x000000ffU, 1654 [BPF_H] = 0x0000ffffU, 1655 [BPF_W] = 0xffffffffU, 1656 }; 1657 1658 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 1659 struct bpf_insn insn, next; 1660 1661 insn = meta1->insn; 1662 next = meta2->insn; 1663 1664 if (BPF_CLASS(insn.code) != BPF_LD) 1665 continue; 1666 if (BPF_MODE(insn.code) != BPF_ABS && 1667 BPF_MODE(insn.code) != BPF_IND) 1668 continue; 1669 1670 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K)) 1671 continue; 1672 1673 if (!exp_mask[BPF_SIZE(insn.code)]) 1674 continue; 1675 if (exp_mask[BPF_SIZE(insn.code)] != next.imm) 1676 continue; 1677 1678 if (next.src_reg || next.dst_reg) 1679 continue; 1680 1681 meta2->skip = true; 1682 } 1683 } 1684 1685 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) 1686 { 1687 struct nfp_insn_meta *meta1, *meta2, *meta3; 1688 1689 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) { 1690 struct bpf_insn insn, next1, next2; 1691 1692 insn = meta1->insn; 1693 next1 = meta2->insn; 1694 next2 = meta3->insn; 1695 1696 if (BPF_CLASS(insn.code) != BPF_LD) 1697 continue; 1698 if (BPF_MODE(insn.code) != BPF_ABS && 1699 BPF_MODE(insn.code) != BPF_IND) 1700 continue; 1701 if (BPF_SIZE(insn.code) != BPF_W) 1702 continue; 1703 1704 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) && 1705 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) && 1706 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) && 1707 next2.code == (BPF_LSH | BPF_K | BPF_ALU64))) 1708 continue; 1709 1710 if (next1.src_reg || next1.dst_reg || 1711 next2.src_reg || next2.dst_reg) 1712 continue; 1713 1714 if (next1.imm != 0x20 || next2.imm != 0x20) 1715 continue; 1716 1717 meta2->skip = true; 1718 meta3->skip = true; 1719 } 1720 } 1721 1722 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) 1723 { 1724 nfp_bpf_opt_reg_init(nfp_prog); 1725 1726 nfp_bpf_opt_ld_mask(nfp_prog); 1727 nfp_bpf_opt_ld_shift(nfp_prog); 1728 1729 return 0; 1730 } 1731 1732 static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore) 1733 { 1734 int i; 1735 1736 for (i = 0; i < nfp_prog->prog_len; i++) { 1737 int err; 1738 1739 err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]); 1740 if (err) 1741 return err; 1742 1743 nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]); 1744 1745 ustore[i] = cpu_to_le64(nfp_prog->prog[i]); 1746 } 1747 1748 return 0; 1749 } 1750 1751 /** 1752 * nfp_bpf_jit() - translate BPF code into NFP assembly 1753 * @filter: kernel BPF filter struct 1754 * @prog_mem: memory to store assembler instructions 1755 * @act: action attached to this eBPF program 1756 * @prog_start: offset of the first instruction when loaded 1757 * @prog_done: where to jump on exit 1758 * @prog_sz: size of @prog_mem in instructions 1759 * @res: achieved parameters of translation results 1760 */ 1761 int 1762 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, 1763 enum nfp_bpf_action_type act, 1764 unsigned int prog_start, unsigned int prog_done, 1765 unsigned int prog_sz, struct nfp_bpf_result *res) 1766 { 1767 struct nfp_prog *nfp_prog; 1768 int ret; 1769 1770 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL); 1771 if (!nfp_prog) 1772 return -ENOMEM; 1773 1774 INIT_LIST_HEAD(&nfp_prog->insns); 1775 nfp_prog->act = act; 1776 nfp_prog->start_off = prog_start; 1777 nfp_prog->tgt_done = prog_done; 1778 1779 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len); 1780 if (ret) 1781 goto out; 1782 1783 ret = nfp_prog_verify(nfp_prog, filter); 1784 if (ret) 1785 goto out; 1786 1787 ret = nfp_bpf_optimize(nfp_prog); 1788 if (ret) 1789 goto out; 1790 1791 nfp_prog->num_regs = MAX_BPF_REG; 1792 nfp_prog->regs_per_thread = 32; 1793 1794 nfp_prog->prog = prog_mem; 1795 nfp_prog->__prog_alloc_len = prog_sz; 1796 1797 ret = nfp_translate(nfp_prog); 1798 if (ret) { 1799 pr_err("Translation failed with error %d (translated: %u)\n", 1800 ret, nfp_prog->n_translated); 1801 ret = -EINVAL; 1802 goto out; 1803 } 1804 1805 ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem); 1806 1807 res->n_instr = nfp_prog->prog_len; 1808 res->dense_mode = false; 1809 out: 1810 nfp_prog_free(nfp_prog); 1811 1812 return ret; 1813 } 1814