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_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, breg; 724 725 areg = insn->dst_reg * 2; 726 breg = insn->src_reg * 2; 727 728 if (insn->off < 0) /* TODO */ 729 return -EOPNOTSUPP; 730 731 if (swap) { 732 areg ^= breg; 733 breg ^= areg; 734 areg ^= breg; 735 } 736 737 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); 738 emit_alu(nfp_prog, reg_none(), 739 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); 740 emit_br(nfp_prog, br_mask, insn->off, 0); 741 742 return 0; 743 } 744 745 /* --- Callbacks --- */ 746 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 747 { 748 const struct bpf_insn *insn = &meta->insn; 749 750 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 751 wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 1); 752 753 return 0; 754 } 755 756 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 757 { 758 u64 imm = meta->insn.imm; /* sign extend */ 759 760 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U); 761 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32); 762 763 return 0; 764 } 765 766 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 767 { 768 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR); 769 } 770 771 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 772 { 773 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); 774 } 775 776 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 777 { 778 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND); 779 } 780 781 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 782 { 783 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 784 } 785 786 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 787 { 788 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR); 789 } 790 791 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 792 { 793 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 794 } 795 796 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 797 { 798 const struct bpf_insn *insn = &meta->insn; 799 800 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 801 reg_a(insn->dst_reg * 2), ALU_OP_ADD, 802 reg_b(insn->src_reg * 2)); 803 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 804 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C, 805 reg_b(insn->src_reg * 2 + 1)); 806 807 return 0; 808 } 809 810 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 811 { 812 const struct bpf_insn *insn = &meta->insn; 813 u64 imm = insn->imm; /* sign extend */ 814 815 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U); 816 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32); 817 818 return 0; 819 } 820 821 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 822 { 823 const struct bpf_insn *insn = &meta->insn; 824 825 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 826 reg_a(insn->dst_reg * 2), ALU_OP_SUB, 827 reg_b(insn->src_reg * 2)); 828 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 829 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C, 830 reg_b(insn->src_reg * 2 + 1)); 831 832 return 0; 833 } 834 835 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 836 { 837 const struct bpf_insn *insn = &meta->insn; 838 u64 imm = insn->imm; /* sign extend */ 839 840 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U); 841 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32); 842 843 return 0; 844 } 845 846 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 847 { 848 const struct bpf_insn *insn = &meta->insn; 849 u8 dst = insn->dst_reg * 2; 850 851 if (insn->imm < 32) { 852 emit_shf(nfp_prog, reg_both(dst + 1), 853 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 854 SHF_SC_R_DSHF, 32 - insn->imm); 855 emit_shf(nfp_prog, reg_both(dst), 856 reg_none(), SHF_OP_NONE, reg_b(dst), 857 SHF_SC_L_SHF, insn->imm); 858 } else if (insn->imm == 32) { 859 wrp_reg_mov(nfp_prog, dst + 1, dst); 860 wrp_immed(nfp_prog, reg_both(dst), 0); 861 } else if (insn->imm > 32) { 862 emit_shf(nfp_prog, reg_both(dst + 1), 863 reg_none(), SHF_OP_NONE, reg_b(dst), 864 SHF_SC_L_SHF, insn->imm - 32); 865 wrp_immed(nfp_prog, reg_both(dst), 0); 866 } 867 868 return 0; 869 } 870 871 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 872 { 873 const struct bpf_insn *insn = &meta->insn; 874 u8 dst = insn->dst_reg * 2; 875 876 if (insn->imm < 32) { 877 emit_shf(nfp_prog, reg_both(dst), 878 reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), 879 SHF_SC_R_DSHF, insn->imm); 880 emit_shf(nfp_prog, reg_both(dst + 1), 881 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 882 SHF_SC_R_SHF, insn->imm); 883 } else if (insn->imm == 32) { 884 wrp_reg_mov(nfp_prog, dst, dst + 1); 885 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 886 } else if (insn->imm > 32) { 887 emit_shf(nfp_prog, reg_both(dst), 888 reg_none(), SHF_OP_NONE, reg_b(dst + 1), 889 SHF_SC_R_SHF, insn->imm - 32); 890 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 891 } 892 893 return 0; 894 } 895 896 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 897 { 898 const struct bpf_insn *insn = &meta->insn; 899 900 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 901 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 902 903 return 0; 904 } 905 906 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 907 { 908 const struct bpf_insn *insn = &meta->insn; 909 910 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 911 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 912 913 return 0; 914 } 915 916 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 917 { 918 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR); 919 } 920 921 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 922 { 923 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm); 924 } 925 926 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 927 { 928 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND); 929 } 930 931 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 932 { 933 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 934 } 935 936 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 937 { 938 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR); 939 } 940 941 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 942 { 943 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 944 } 945 946 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 947 { 948 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD); 949 } 950 951 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 952 { 953 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm); 954 } 955 956 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 957 { 958 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB); 959 } 960 961 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 962 { 963 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm); 964 } 965 966 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 967 { 968 const struct bpf_insn *insn = &meta->insn; 969 970 if (!insn->imm) 971 return 1; /* TODO: zero shift means indirect */ 972 973 emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), 974 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), 975 SHF_SC_L_SHF, insn->imm); 976 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 977 978 return 0; 979 } 980 981 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 982 { 983 wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1), 984 meta->insn.imm); 985 986 return 0; 987 } 988 989 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 990 { 991 const struct bpf_insn *insn = &meta->insn; 992 993 meta->double_cb = imm_ld8_part2; 994 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 995 996 return 0; 997 } 998 999 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1000 { 1001 return construct_data_ld(nfp_prog, meta->insn.imm, 1); 1002 } 1003 1004 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1005 { 1006 return construct_data_ld(nfp_prog, meta->insn.imm, 2); 1007 } 1008 1009 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1010 { 1011 return construct_data_ld(nfp_prog, meta->insn.imm, 4); 1012 } 1013 1014 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1015 { 1016 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1017 meta->insn.src_reg * 2, true, 1); 1018 } 1019 1020 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1021 { 1022 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1023 meta->insn.src_reg * 2, true, 2); 1024 } 1025 1026 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1027 { 1028 return construct_data_ind_ld(nfp_prog, meta->insn.imm, 1029 meta->insn.src_reg * 2, true, 4); 1030 } 1031 1032 static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1033 { 1034 if (meta->insn.off == offsetof(struct sk_buff, len)) 1035 emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2), 1036 reg_none(), ALU_OP_NONE, plen_reg(nfp_prog)); 1037 else 1038 return -EOPNOTSUPP; 1039 1040 return 0; 1041 } 1042 1043 static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1044 { 1045 swreg dst = reg_both(meta->insn.dst_reg * 2); 1046 1047 if (meta->insn.off != offsetof(struct xdp_md, data) && 1048 meta->insn.off != offsetof(struct xdp_md, data_end)) 1049 return -EOPNOTSUPP; 1050 1051 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, pptr_reg(nfp_prog)); 1052 1053 if (meta->insn.off == offsetof(struct xdp_md, data)) 1054 return 0; 1055 1056 emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, plen_reg(nfp_prog)); 1057 1058 return 0; 1059 } 1060 1061 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1062 { 1063 int ret; 1064 1065 if (nfp_prog->act == NN_ACT_XDP) 1066 ret = mem_ldx4_xdp(nfp_prog, meta); 1067 else 1068 ret = mem_ldx4_skb(nfp_prog, meta); 1069 1070 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 1071 1072 return ret; 1073 } 1074 1075 static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1076 { 1077 return -EOPNOTSUPP; 1078 } 1079 1080 static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1081 { 1082 return -EOPNOTSUPP; 1083 } 1084 1085 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1086 { 1087 if (nfp_prog->act == NN_ACT_XDP) 1088 return mem_stx4_xdp(nfp_prog, meta); 1089 return mem_stx4_skb(nfp_prog, meta); 1090 } 1091 1092 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1093 { 1094 if (meta->insn.off < 0) /* TODO */ 1095 return -EOPNOTSUPP; 1096 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0); 1097 1098 return 0; 1099 } 1100 1101 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1102 { 1103 const struct bpf_insn *insn = &meta->insn; 1104 u64 imm = insn->imm; /* sign extend */ 1105 swreg or1, or2, tmp_reg; 1106 1107 or1 = reg_a(insn->dst_reg * 2); 1108 or2 = reg_b(insn->dst_reg * 2 + 1); 1109 1110 if (insn->off < 0) /* TODO */ 1111 return -EOPNOTSUPP; 1112 1113 if (imm & ~0U) { 1114 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1115 emit_alu(nfp_prog, imm_a(nfp_prog), 1116 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1117 or1 = imm_a(nfp_prog); 1118 } 1119 1120 if (imm >> 32) { 1121 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1122 emit_alu(nfp_prog, imm_b(nfp_prog), 1123 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1124 or2 = imm_b(nfp_prog); 1125 } 1126 1127 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2); 1128 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1129 1130 return 0; 1131 } 1132 1133 static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1134 { 1135 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true); 1136 } 1137 1138 static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1139 { 1140 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false); 1141 } 1142 1143 static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1144 { 1145 return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false); 1146 } 1147 1148 static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1149 { 1150 return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true); 1151 } 1152 1153 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1154 { 1155 const struct bpf_insn *insn = &meta->insn; 1156 u64 imm = insn->imm; /* sign extend */ 1157 swreg tmp_reg; 1158 1159 if (insn->off < 0) /* TODO */ 1160 return -EOPNOTSUPP; 1161 1162 if (!imm) { 1163 meta->skip = true; 1164 return 0; 1165 } 1166 1167 if (imm & ~0U) { 1168 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1169 emit_alu(nfp_prog, reg_none(), 1170 reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg); 1171 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1172 } 1173 1174 if (imm >> 32) { 1175 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1176 emit_alu(nfp_prog, reg_none(), 1177 reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg); 1178 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1179 } 1180 1181 return 0; 1182 } 1183 1184 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1185 { 1186 const struct bpf_insn *insn = &meta->insn; 1187 u64 imm = insn->imm; /* sign extend */ 1188 swreg tmp_reg; 1189 1190 if (insn->off < 0) /* TODO */ 1191 return -EOPNOTSUPP; 1192 1193 if (!imm) { 1194 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), 1195 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); 1196 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1197 return 0; 1198 } 1199 1200 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1201 emit_alu(nfp_prog, reg_none(), 1202 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 1203 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1204 1205 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1206 emit_alu(nfp_prog, reg_none(), 1207 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 1208 emit_br(nfp_prog, BR_BNE, insn->off, 0); 1209 1210 return 0; 1211 } 1212 1213 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1214 { 1215 const struct bpf_insn *insn = &meta->insn; 1216 1217 if (insn->off < 0) /* TODO */ 1218 return -EOPNOTSUPP; 1219 1220 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), 1221 ALU_OP_XOR, reg_b(insn->src_reg * 2)); 1222 emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1), 1223 ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1)); 1224 emit_alu(nfp_prog, reg_none(), 1225 imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog)); 1226 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 1227 1228 return 0; 1229 } 1230 1231 static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1232 { 1233 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true); 1234 } 1235 1236 static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1237 { 1238 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false); 1239 } 1240 1241 static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1242 { 1243 return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false); 1244 } 1245 1246 static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1247 { 1248 return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true); 1249 } 1250 1251 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1252 { 1253 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE); 1254 } 1255 1256 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1257 { 1258 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE); 1259 } 1260 1261 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1262 { 1263 wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT); 1264 1265 return 0; 1266 } 1267 1268 static const instr_cb_t instr_cb[256] = { 1269 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64, 1270 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64, 1271 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64, 1272 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64, 1273 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64, 1274 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64, 1275 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64, 1276 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64, 1277 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64, 1278 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64, 1279 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64, 1280 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64, 1281 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64, 1282 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64, 1283 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg, 1284 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm, 1285 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg, 1286 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm, 1287 [BPF_ALU | BPF_AND | BPF_X] = and_reg, 1288 [BPF_ALU | BPF_AND | BPF_K] = and_imm, 1289 [BPF_ALU | BPF_OR | BPF_X] = or_reg, 1290 [BPF_ALU | BPF_OR | BPF_K] = or_imm, 1291 [BPF_ALU | BPF_ADD | BPF_X] = add_reg, 1292 [BPF_ALU | BPF_ADD | BPF_K] = add_imm, 1293 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg, 1294 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm, 1295 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, 1296 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8, 1297 [BPF_LD | BPF_ABS | BPF_B] = data_ld1, 1298 [BPF_LD | BPF_ABS | BPF_H] = data_ld2, 1299 [BPF_LD | BPF_ABS | BPF_W] = data_ld4, 1300 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1, 1301 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2, 1302 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4, 1303 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4, 1304 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4, 1305 [BPF_JMP | BPF_JA | BPF_K] = jump, 1306 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm, 1307 [BPF_JMP | BPF_JGT | BPF_K] = jgt_imm, 1308 [BPF_JMP | BPF_JGE | BPF_K] = jge_imm, 1309 [BPF_JMP | BPF_JLT | BPF_K] = jlt_imm, 1310 [BPF_JMP | BPF_JLE | BPF_K] = jle_imm, 1311 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm, 1312 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm, 1313 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg, 1314 [BPF_JMP | BPF_JGT | BPF_X] = jgt_reg, 1315 [BPF_JMP | BPF_JGE | BPF_X] = jge_reg, 1316 [BPF_JMP | BPF_JLT | BPF_X] = jlt_reg, 1317 [BPF_JMP | BPF_JLE | BPF_X] = jle_reg, 1318 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, 1319 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, 1320 [BPF_JMP | BPF_EXIT] = goto_out, 1321 }; 1322 1323 /* --- Misc code --- */ 1324 static void br_set_offset(u64 *instr, u16 offset) 1325 { 1326 u16 addr_lo, addr_hi; 1327 1328 addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 1329 addr_hi = offset != addr_lo; 1330 *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); 1331 *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 1332 *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); 1333 } 1334 1335 /* --- Assembler logic --- */ 1336 static int nfp_fixup_branches(struct nfp_prog *nfp_prog) 1337 { 1338 struct nfp_insn_meta *meta, *next; 1339 u32 off, br_idx; 1340 u32 idx; 1341 1342 nfp_for_each_insn_walk2(nfp_prog, meta, next) { 1343 if (meta->skip) 1344 continue; 1345 if (BPF_CLASS(meta->insn.code) != BPF_JMP) 1346 continue; 1347 1348 br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1; 1349 if (!nfp_is_br(nfp_prog->prog[br_idx])) { 1350 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n", 1351 br_idx, meta->insn.code, nfp_prog->prog[br_idx]); 1352 return -ELOOP; 1353 } 1354 /* Leave special branches for later */ 1355 if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx])) 1356 continue; 1357 1358 /* Find the target offset in assembler realm */ 1359 off = meta->insn.off; 1360 if (!off) { 1361 pr_err("Fixup found zero offset!!\n"); 1362 return -ELOOP; 1363 } 1364 1365 while (off && nfp_meta_has_next(nfp_prog, next)) { 1366 next = nfp_meta_next(next); 1367 off--; 1368 } 1369 if (off) { 1370 pr_err("Fixup found too large jump!! %d\n", off); 1371 return -ELOOP; 1372 } 1373 1374 if (next->skip) { 1375 pr_err("Branch landing on removed instruction!!\n"); 1376 return -ELOOP; 1377 } 1378 1379 for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off); 1380 idx <= br_idx; idx++) { 1381 if (!nfp_is_br(nfp_prog->prog[idx])) 1382 continue; 1383 br_set_offset(&nfp_prog->prog[idx], next->off); 1384 } 1385 } 1386 1387 /* Fixup 'goto out's separately, they can be scattered around */ 1388 for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) { 1389 enum br_special special; 1390 1391 if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE) 1392 continue; 1393 1394 special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]); 1395 switch (special) { 1396 case OP_BR_NORMAL: 1397 break; 1398 case OP_BR_GO_OUT: 1399 br_set_offset(&nfp_prog->prog[br_idx], 1400 nfp_prog->tgt_out); 1401 break; 1402 case OP_BR_GO_ABORT: 1403 br_set_offset(&nfp_prog->prog[br_idx], 1404 nfp_prog->tgt_abort); 1405 break; 1406 } 1407 1408 nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL; 1409 } 1410 1411 return 0; 1412 } 1413 1414 static void nfp_intro(struct nfp_prog *nfp_prog) 1415 { 1416 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0)); 1417 emit_alu(nfp_prog, plen_reg(nfp_prog), 1418 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog)); 1419 } 1420 1421 static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog) 1422 { 1423 const u8 act2code[] = { 1424 [NN_ACT_TC_DROP] = 0x22, 1425 [NN_ACT_TC_REDIR] = 0x24 1426 }; 1427 /* Target for aborts */ 1428 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1429 wrp_immed(nfp_prog, reg_both(0), 0); 1430 1431 /* Target for normal exits */ 1432 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1433 /* Legacy TC mode: 1434 * 0 0x11 -> pass, count as stat0 1435 * -1 drop 0x22 -> drop, count as stat1 1436 * redir 0x24 -> redir, count as stat1 1437 * ife mark 0x21 -> pass, count as stat1 1438 * ife + tx 0x24 -> redir, count as stat1 1439 */ 1440 emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2); 1441 emit_alu(nfp_prog, reg_a(0), 1442 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1443 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1444 1445 emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1); 1446 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]), 1447 SHF_SC_L_SHF, 16); 1448 } 1449 1450 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) 1451 { 1452 /* TC direct-action mode: 1453 * 0,1 ok NOT SUPPORTED[1] 1454 * 2 drop 0x22 -> drop, count as stat1 1455 * 4,5 nuke 0x02 -> drop 1456 * 7 redir 0x44 -> redir, count as stat2 1457 * * unspec 0x11 -> pass, count as stat0 1458 * 1459 * [1] We can't support OK and RECLASSIFY because we can't tell TC 1460 * the exact decision made. We are forced to support UNSPEC 1461 * to handle aborts so that's the only one we handle for passing 1462 * packets up the stack. 1463 */ 1464 /* Target for aborts */ 1465 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1466 1467 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1468 1469 emit_alu(nfp_prog, reg_a(0), 1470 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1471 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 1472 1473 /* Target for normal exits */ 1474 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 1475 1476 /* if R0 > 7 jump to abort */ 1477 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0)); 1478 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 1479 emit_alu(nfp_prog, reg_a(0), 1480 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1481 1482 wrp_immed(nfp_prog, reg_b(2), 0x41221211); 1483 wrp_immed(nfp_prog, reg_b(3), 0x41001211); 1484 1485 emit_shf(nfp_prog, reg_a(1), 1486 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2); 1487 1488 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1489 emit_shf(nfp_prog, reg_a(2), 1490 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 1491 1492 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 1493 emit_shf(nfp_prog, reg_b(2), 1494 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); 1495 1496 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1497 1498 emit_shf(nfp_prog, reg_b(2), 1499 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); 1500 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1501 } 1502 1503 static void nfp_outro_xdp(struct nfp_prog *nfp_prog) 1504 { 1505 /* XDP return codes: 1506 * 0 aborted 0x82 -> drop, count as stat3 1507 * 1 drop 0x22 -> drop, count as stat1 1508 * 2 pass 0x11 -> pass, count as stat0 1509 * 3 tx 0x44 -> redir, count as stat2 1510 * * unknown 0x82 -> drop, count as stat3 1511 */ 1512 /* Target for aborts */ 1513 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 1514 1515 emit_br_def(nfp_prog, nfp_prog->tgt_done, 2); 1516 1517 emit_alu(nfp_prog, reg_a(0), 1518 reg_none(), ALU_OP_NONE, 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 emit_alu(nfp_prog, reg_a(0), 1540 reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS); 1541 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 1542 } 1543 1544 static void nfp_outro(struct nfp_prog *nfp_prog) 1545 { 1546 switch (nfp_prog->act) { 1547 case NN_ACT_DIRECT: 1548 nfp_outro_tc_da(nfp_prog); 1549 break; 1550 case NN_ACT_TC_DROP: 1551 case NN_ACT_TC_REDIR: 1552 nfp_outro_tc_legacy(nfp_prog); 1553 break; 1554 case NN_ACT_XDP: 1555 nfp_outro_xdp(nfp_prog); 1556 break; 1557 } 1558 } 1559 1560 static int nfp_translate(struct nfp_prog *nfp_prog) 1561 { 1562 struct nfp_insn_meta *meta; 1563 int i, err; 1564 1565 nfp_intro(nfp_prog); 1566 if (nfp_prog->error) 1567 return nfp_prog->error; 1568 1569 list_for_each_entry(meta, &nfp_prog->insns, l) { 1570 instr_cb_t cb = instr_cb[meta->insn.code]; 1571 1572 meta->off = nfp_prog_current_offset(nfp_prog); 1573 1574 if (meta->skip) { 1575 nfp_prog->n_translated++; 1576 continue; 1577 } 1578 1579 if (nfp_meta_has_prev(nfp_prog, meta) && 1580 nfp_meta_prev(meta)->double_cb) 1581 cb = nfp_meta_prev(meta)->double_cb; 1582 if (!cb) 1583 return -ENOENT; 1584 err = cb(nfp_prog, meta); 1585 if (err) 1586 return err; 1587 1588 nfp_prog->n_translated++; 1589 } 1590 1591 nfp_outro(nfp_prog); 1592 if (nfp_prog->error) 1593 return nfp_prog->error; 1594 1595 for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++) 1596 emit_nop(nfp_prog); 1597 if (nfp_prog->error) 1598 return nfp_prog->error; 1599 1600 return nfp_fixup_branches(nfp_prog); 1601 } 1602 1603 static int 1604 nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog, 1605 unsigned int cnt) 1606 { 1607 unsigned int i; 1608 1609 for (i = 0; i < cnt; i++) { 1610 struct nfp_insn_meta *meta; 1611 1612 meta = kzalloc(sizeof(*meta), GFP_KERNEL); 1613 if (!meta) 1614 return -ENOMEM; 1615 1616 meta->insn = prog[i]; 1617 meta->n = i; 1618 1619 list_add_tail(&meta->l, &nfp_prog->insns); 1620 } 1621 1622 return 0; 1623 } 1624 1625 /* --- Optimizations --- */ 1626 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) 1627 { 1628 struct nfp_insn_meta *meta; 1629 1630 list_for_each_entry(meta, &nfp_prog->insns, l) { 1631 struct bpf_insn insn = meta->insn; 1632 1633 /* Programs converted from cBPF start with register xoring */ 1634 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) && 1635 insn.src_reg == insn.dst_reg) 1636 continue; 1637 1638 /* Programs start with R6 = R1 but we ignore the skb pointer */ 1639 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && 1640 insn.src_reg == 1 && insn.dst_reg == 6) 1641 meta->skip = true; 1642 1643 /* Return as soon as something doesn't match */ 1644 if (!meta->skip) 1645 return; 1646 } 1647 } 1648 1649 /* Remove masking after load since our load guarantees this is not needed */ 1650 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) 1651 { 1652 struct nfp_insn_meta *meta1, *meta2; 1653 const s32 exp_mask[] = { 1654 [BPF_B] = 0x000000ffU, 1655 [BPF_H] = 0x0000ffffU, 1656 [BPF_W] = 0xffffffffU, 1657 }; 1658 1659 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 1660 struct bpf_insn insn, next; 1661 1662 insn = meta1->insn; 1663 next = meta2->insn; 1664 1665 if (BPF_CLASS(insn.code) != BPF_LD) 1666 continue; 1667 if (BPF_MODE(insn.code) != BPF_ABS && 1668 BPF_MODE(insn.code) != BPF_IND) 1669 continue; 1670 1671 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K)) 1672 continue; 1673 1674 if (!exp_mask[BPF_SIZE(insn.code)]) 1675 continue; 1676 if (exp_mask[BPF_SIZE(insn.code)] != next.imm) 1677 continue; 1678 1679 if (next.src_reg || next.dst_reg) 1680 continue; 1681 1682 meta2->skip = true; 1683 } 1684 } 1685 1686 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) 1687 { 1688 struct nfp_insn_meta *meta1, *meta2, *meta3; 1689 1690 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) { 1691 struct bpf_insn insn, next1, next2; 1692 1693 insn = meta1->insn; 1694 next1 = meta2->insn; 1695 next2 = meta3->insn; 1696 1697 if (BPF_CLASS(insn.code) != BPF_LD) 1698 continue; 1699 if (BPF_MODE(insn.code) != BPF_ABS && 1700 BPF_MODE(insn.code) != BPF_IND) 1701 continue; 1702 if (BPF_SIZE(insn.code) != BPF_W) 1703 continue; 1704 1705 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) && 1706 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) && 1707 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) && 1708 next2.code == (BPF_LSH | BPF_K | BPF_ALU64))) 1709 continue; 1710 1711 if (next1.src_reg || next1.dst_reg || 1712 next2.src_reg || next2.dst_reg) 1713 continue; 1714 1715 if (next1.imm != 0x20 || next2.imm != 0x20) 1716 continue; 1717 1718 meta2->skip = true; 1719 meta3->skip = true; 1720 } 1721 } 1722 1723 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) 1724 { 1725 nfp_bpf_opt_reg_init(nfp_prog); 1726 1727 nfp_bpf_opt_ld_mask(nfp_prog); 1728 nfp_bpf_opt_ld_shift(nfp_prog); 1729 1730 return 0; 1731 } 1732 1733 static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore) 1734 { 1735 int i; 1736 1737 for (i = 0; i < nfp_prog->prog_len; i++) { 1738 int err; 1739 1740 err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]); 1741 if (err) 1742 return err; 1743 1744 nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]); 1745 1746 ustore[i] = cpu_to_le64(nfp_prog->prog[i]); 1747 } 1748 1749 return 0; 1750 } 1751 1752 /** 1753 * nfp_bpf_jit() - translate BPF code into NFP assembly 1754 * @filter: kernel BPF filter struct 1755 * @prog_mem: memory to store assembler instructions 1756 * @act: action attached to this eBPF program 1757 * @prog_start: offset of the first instruction when loaded 1758 * @prog_done: where to jump on exit 1759 * @prog_sz: size of @prog_mem in instructions 1760 * @res: achieved parameters of translation results 1761 */ 1762 int 1763 nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem, 1764 enum nfp_bpf_action_type act, 1765 unsigned int prog_start, unsigned int prog_done, 1766 unsigned int prog_sz, struct nfp_bpf_result *res) 1767 { 1768 struct nfp_prog *nfp_prog; 1769 int ret; 1770 1771 nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL); 1772 if (!nfp_prog) 1773 return -ENOMEM; 1774 1775 INIT_LIST_HEAD(&nfp_prog->insns); 1776 nfp_prog->act = act; 1777 nfp_prog->start_off = prog_start; 1778 nfp_prog->tgt_done = prog_done; 1779 1780 ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len); 1781 if (ret) 1782 goto out; 1783 1784 ret = nfp_prog_verify(nfp_prog, filter); 1785 if (ret) 1786 goto out; 1787 1788 ret = nfp_bpf_optimize(nfp_prog); 1789 if (ret) 1790 goto out; 1791 1792 nfp_prog->num_regs = MAX_BPF_REG; 1793 nfp_prog->regs_per_thread = 32; 1794 1795 nfp_prog->prog = prog_mem; 1796 nfp_prog->__prog_alloc_len = prog_sz; 1797 1798 ret = nfp_translate(nfp_prog); 1799 if (ret) { 1800 pr_err("Translation failed with error %d (translated: %u)\n", 1801 ret, nfp_prog->n_translated); 1802 ret = -EINVAL; 1803 goto out; 1804 } 1805 1806 ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem); 1807 1808 res->n_instr = nfp_prog->prog_len; 1809 res->dense_mode = false; 1810 out: 1811 nfp_prog_free(nfp_prog); 1812 1813 return ret; 1814 } 1815