1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2016-2018 Netronome Systems, Inc. */ 3 4 #define pr_fmt(fmt) "NFP net bpf: " fmt 5 6 #include <linux/bug.h> 7 #include <linux/bpf.h> 8 #include <linux/filter.h> 9 #include <linux/kernel.h> 10 #include <linux/pkt_cls.h> 11 #include <linux/reciprocal_div.h> 12 #include <linux/unistd.h> 13 14 #include "main.h" 15 #include "../nfp_asm.h" 16 #include "../nfp_net_ctrl.h" 17 18 /* --- NFP prog --- */ 19 /* Foreach "multiple" entries macros provide pos and next<n> pointers. 20 * It's safe to modify the next pointers (but not pos). 21 */ 22 #define nfp_for_each_insn_walk2(nfp_prog, pos, next) \ 23 for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \ 24 next = list_next_entry(pos, l); \ 25 &(nfp_prog)->insns != &pos->l && \ 26 &(nfp_prog)->insns != &next->l; \ 27 pos = nfp_meta_next(pos), \ 28 next = nfp_meta_next(pos)) 29 30 #define nfp_for_each_insn_walk3(nfp_prog, pos, next, next2) \ 31 for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \ 32 next = list_next_entry(pos, l), \ 33 next2 = list_next_entry(next, l); \ 34 &(nfp_prog)->insns != &pos->l && \ 35 &(nfp_prog)->insns != &next->l && \ 36 &(nfp_prog)->insns != &next2->l; \ 37 pos = nfp_meta_next(pos), \ 38 next = nfp_meta_next(pos), \ 39 next2 = nfp_meta_next(next)) 40 41 static bool 42 nfp_meta_has_prev(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 43 { 44 return meta->l.prev != &nfp_prog->insns; 45 } 46 47 static void nfp_prog_push(struct nfp_prog *nfp_prog, u64 insn) 48 { 49 if (nfp_prog->__prog_alloc_len / sizeof(u64) == nfp_prog->prog_len) { 50 pr_warn("instruction limit reached (%u NFP instructions)\n", 51 nfp_prog->prog_len); 52 nfp_prog->error = -ENOSPC; 53 return; 54 } 55 56 nfp_prog->prog[nfp_prog->prog_len] = insn; 57 nfp_prog->prog_len++; 58 } 59 60 static unsigned int nfp_prog_current_offset(struct nfp_prog *nfp_prog) 61 { 62 return nfp_prog->prog_len; 63 } 64 65 static bool 66 nfp_prog_confirm_current_offset(struct nfp_prog *nfp_prog, unsigned int off) 67 { 68 /* If there is a recorded error we may have dropped instructions; 69 * that doesn't have to be due to translator bug, and the translation 70 * will fail anyway, so just return OK. 71 */ 72 if (nfp_prog->error) 73 return true; 74 return !WARN_ON_ONCE(nfp_prog_current_offset(nfp_prog) != off); 75 } 76 77 /* --- Emitters --- */ 78 static void 79 __emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op, 80 u8 mode, u8 xfer, u8 areg, u8 breg, u8 size, enum cmd_ctx_swap ctx, 81 bool indir) 82 { 83 u64 insn; 84 85 insn = FIELD_PREP(OP_CMD_A_SRC, areg) | 86 FIELD_PREP(OP_CMD_CTX, ctx) | 87 FIELD_PREP(OP_CMD_B_SRC, breg) | 88 FIELD_PREP(OP_CMD_TOKEN, cmd_tgt_act[op].token) | 89 FIELD_PREP(OP_CMD_XFER, xfer) | 90 FIELD_PREP(OP_CMD_CNT, size) | 91 FIELD_PREP(OP_CMD_SIG, ctx != CMD_CTX_NO_SWAP) | 92 FIELD_PREP(OP_CMD_TGT_CMD, cmd_tgt_act[op].tgt_cmd) | 93 FIELD_PREP(OP_CMD_INDIR, indir) | 94 FIELD_PREP(OP_CMD_MODE, mode); 95 96 nfp_prog_push(nfp_prog, insn); 97 } 98 99 static void 100 emit_cmd_any(struct nfp_prog *nfp_prog, enum cmd_tgt_map op, u8 mode, u8 xfer, 101 swreg lreg, swreg rreg, u8 size, enum cmd_ctx_swap ctx, bool indir) 102 { 103 struct nfp_insn_re_regs reg; 104 int err; 105 106 err = swreg_to_restricted(reg_none(), lreg, rreg, ®, false); 107 if (err) { 108 nfp_prog->error = err; 109 return; 110 } 111 if (reg.swap) { 112 pr_err("cmd can't swap arguments\n"); 113 nfp_prog->error = -EFAULT; 114 return; 115 } 116 if (reg.dst_lmextn || reg.src_lmextn) { 117 pr_err("cmd can't use LMextn\n"); 118 nfp_prog->error = -EFAULT; 119 return; 120 } 121 122 __emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, ctx, 123 indir); 124 } 125 126 static void 127 emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op, u8 mode, u8 xfer, 128 swreg lreg, swreg rreg, u8 size, enum cmd_ctx_swap ctx) 129 { 130 emit_cmd_any(nfp_prog, op, mode, xfer, lreg, rreg, size, ctx, false); 131 } 132 133 static void 134 emit_cmd_indir(struct nfp_prog *nfp_prog, enum cmd_tgt_map op, u8 mode, u8 xfer, 135 swreg lreg, swreg rreg, u8 size, enum cmd_ctx_swap ctx) 136 { 137 emit_cmd_any(nfp_prog, op, mode, xfer, lreg, rreg, size, ctx, true); 138 } 139 140 static void 141 __emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, enum br_ev_pip ev_pip, 142 enum br_ctx_signal_state css, u16 addr, u8 defer) 143 { 144 u16 addr_lo, addr_hi; 145 u64 insn; 146 147 addr_lo = addr & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); 148 addr_hi = addr != addr_lo; 149 150 insn = OP_BR_BASE | 151 FIELD_PREP(OP_BR_MASK, mask) | 152 FIELD_PREP(OP_BR_EV_PIP, ev_pip) | 153 FIELD_PREP(OP_BR_CSS, css) | 154 FIELD_PREP(OP_BR_DEFBR, defer) | 155 FIELD_PREP(OP_BR_ADDR_LO, addr_lo) | 156 FIELD_PREP(OP_BR_ADDR_HI, addr_hi); 157 158 nfp_prog_push(nfp_prog, insn); 159 } 160 161 static void 162 emit_br_relo(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer, 163 enum nfp_relo_type relo) 164 { 165 if (mask == BR_UNC && defer > 2) { 166 pr_err("BUG: branch defer out of bounds %d\n", defer); 167 nfp_prog->error = -EFAULT; 168 return; 169 } 170 171 __emit_br(nfp_prog, mask, 172 mask != BR_UNC ? BR_EV_PIP_COND : BR_EV_PIP_UNCOND, 173 BR_CSS_NONE, addr, defer); 174 175 nfp_prog->prog[nfp_prog->prog_len - 1] |= 176 FIELD_PREP(OP_RELO_TYPE, relo); 177 } 178 179 static void 180 emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer) 181 { 182 emit_br_relo(nfp_prog, mask, addr, defer, RELO_BR_REL); 183 } 184 185 static void 186 __emit_br_bit(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 addr, u8 defer, 187 bool set, bool src_lmextn) 188 { 189 u16 addr_lo, addr_hi; 190 u64 insn; 191 192 addr_lo = addr & (OP_BR_BIT_ADDR_LO >> __bf_shf(OP_BR_BIT_ADDR_LO)); 193 addr_hi = addr != addr_lo; 194 195 insn = OP_BR_BIT_BASE | 196 FIELD_PREP(OP_BR_BIT_A_SRC, areg) | 197 FIELD_PREP(OP_BR_BIT_B_SRC, breg) | 198 FIELD_PREP(OP_BR_BIT_BV, set) | 199 FIELD_PREP(OP_BR_BIT_DEFBR, defer) | 200 FIELD_PREP(OP_BR_BIT_ADDR_LO, addr_lo) | 201 FIELD_PREP(OP_BR_BIT_ADDR_HI, addr_hi) | 202 FIELD_PREP(OP_BR_BIT_SRC_LMEXTN, src_lmextn); 203 204 nfp_prog_push(nfp_prog, insn); 205 } 206 207 static void 208 emit_br_bit_relo(struct nfp_prog *nfp_prog, swreg src, u8 bit, u16 addr, 209 u8 defer, bool set, enum nfp_relo_type relo) 210 { 211 struct nfp_insn_re_regs reg; 212 int err; 213 214 /* NOTE: The bit to test is specified as an rotation amount, such that 215 * the bit to test will be placed on the MSB of the result when 216 * doing a rotate right. For bit X, we need right rotate X + 1. 217 */ 218 bit += 1; 219 220 err = swreg_to_restricted(reg_none(), src, reg_imm(bit), ®, false); 221 if (err) { 222 nfp_prog->error = err; 223 return; 224 } 225 226 __emit_br_bit(nfp_prog, reg.areg, reg.breg, addr, defer, set, 227 reg.src_lmextn); 228 229 nfp_prog->prog[nfp_prog->prog_len - 1] |= 230 FIELD_PREP(OP_RELO_TYPE, relo); 231 } 232 233 static void 234 emit_br_bset(struct nfp_prog *nfp_prog, swreg src, u8 bit, u16 addr, u8 defer) 235 { 236 emit_br_bit_relo(nfp_prog, src, bit, addr, defer, true, RELO_BR_REL); 237 } 238 239 static void 240 __emit_br_alu(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi, 241 u8 defer, bool dst_lmextn, bool src_lmextn) 242 { 243 u64 insn; 244 245 insn = OP_BR_ALU_BASE | 246 FIELD_PREP(OP_BR_ALU_A_SRC, areg) | 247 FIELD_PREP(OP_BR_ALU_B_SRC, breg) | 248 FIELD_PREP(OP_BR_ALU_DEFBR, defer) | 249 FIELD_PREP(OP_BR_ALU_IMM_HI, imm_hi) | 250 FIELD_PREP(OP_BR_ALU_SRC_LMEXTN, src_lmextn) | 251 FIELD_PREP(OP_BR_ALU_DST_LMEXTN, dst_lmextn); 252 253 nfp_prog_push(nfp_prog, insn); 254 } 255 256 static void emit_rtn(struct nfp_prog *nfp_prog, swreg base, u8 defer) 257 { 258 struct nfp_insn_ur_regs reg; 259 int err; 260 261 err = swreg_to_unrestricted(reg_none(), base, reg_imm(0), ®); 262 if (err) { 263 nfp_prog->error = err; 264 return; 265 } 266 267 __emit_br_alu(nfp_prog, reg.areg, reg.breg, 0, defer, reg.dst_lmextn, 268 reg.src_lmextn); 269 } 270 271 static void 272 __emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi, 273 enum immed_width width, bool invert, 274 enum immed_shift shift, bool wr_both, 275 bool dst_lmextn, bool src_lmextn) 276 { 277 u64 insn; 278 279 insn = OP_IMMED_BASE | 280 FIELD_PREP(OP_IMMED_A_SRC, areg) | 281 FIELD_PREP(OP_IMMED_B_SRC, breg) | 282 FIELD_PREP(OP_IMMED_IMM, imm_hi) | 283 FIELD_PREP(OP_IMMED_WIDTH, width) | 284 FIELD_PREP(OP_IMMED_INV, invert) | 285 FIELD_PREP(OP_IMMED_SHIFT, shift) | 286 FIELD_PREP(OP_IMMED_WR_AB, wr_both) | 287 FIELD_PREP(OP_IMMED_SRC_LMEXTN, src_lmextn) | 288 FIELD_PREP(OP_IMMED_DST_LMEXTN, dst_lmextn); 289 290 nfp_prog_push(nfp_prog, insn); 291 } 292 293 static void 294 emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm, 295 enum immed_width width, bool invert, enum immed_shift shift) 296 { 297 struct nfp_insn_ur_regs reg; 298 int err; 299 300 if (swreg_type(dst) == NN_REG_IMM) { 301 nfp_prog->error = -EFAULT; 302 return; 303 } 304 305 err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), ®); 306 if (err) { 307 nfp_prog->error = err; 308 return; 309 } 310 311 /* Use reg.dst when destination is No-Dest. */ 312 __emit_immed(nfp_prog, 313 swreg_type(dst) == NN_REG_NONE ? reg.dst : reg.areg, 314 reg.breg, imm >> 8, width, invert, shift, 315 reg.wr_both, reg.dst_lmextn, reg.src_lmextn); 316 } 317 318 static void 319 __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab, 320 enum shf_sc sc, u8 shift, 321 u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both, 322 bool dst_lmextn, bool src_lmextn) 323 { 324 u64 insn; 325 326 if (!FIELD_FIT(OP_SHF_SHIFT, shift)) { 327 nfp_prog->error = -EFAULT; 328 return; 329 } 330 331 /* NFP shift instruction has something special. If shift direction is 332 * left then shift amount of 1 to 31 is specified as 32 minus the amount 333 * to shift. 334 * 335 * But no need to do this for indirect shift which has shift amount be 336 * 0. Even after we do this subtraction, shift amount 0 will be turned 337 * into 32 which will eventually be encoded the same as 0 because only 338 * low 5 bits are encoded, but shift amount be 32 will fail the 339 * FIELD_PREP check done later on shift mask (0x1f), due to 32 is out of 340 * mask range. 341 */ 342 if (sc == SHF_SC_L_SHF && shift) 343 shift = 32 - shift; 344 345 insn = OP_SHF_BASE | 346 FIELD_PREP(OP_SHF_A_SRC, areg) | 347 FIELD_PREP(OP_SHF_SC, sc) | 348 FIELD_PREP(OP_SHF_B_SRC, breg) | 349 FIELD_PREP(OP_SHF_I8, i8) | 350 FIELD_PREP(OP_SHF_SW, sw) | 351 FIELD_PREP(OP_SHF_DST, dst) | 352 FIELD_PREP(OP_SHF_SHIFT, shift) | 353 FIELD_PREP(OP_SHF_OP, op) | 354 FIELD_PREP(OP_SHF_DST_AB, dst_ab) | 355 FIELD_PREP(OP_SHF_WR_AB, wr_both) | 356 FIELD_PREP(OP_SHF_SRC_LMEXTN, src_lmextn) | 357 FIELD_PREP(OP_SHF_DST_LMEXTN, dst_lmextn); 358 359 nfp_prog_push(nfp_prog, insn); 360 } 361 362 static void 363 emit_shf(struct nfp_prog *nfp_prog, swreg dst, 364 swreg lreg, enum shf_op op, swreg rreg, enum shf_sc sc, u8 shift) 365 { 366 struct nfp_insn_re_regs reg; 367 int err; 368 369 err = swreg_to_restricted(dst, lreg, rreg, ®, true); 370 if (err) { 371 nfp_prog->error = err; 372 return; 373 } 374 375 __emit_shf(nfp_prog, reg.dst, reg.dst_ab, sc, shift, 376 reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both, 377 reg.dst_lmextn, reg.src_lmextn); 378 } 379 380 static void 381 emit_shf_indir(struct nfp_prog *nfp_prog, swreg dst, 382 swreg lreg, enum shf_op op, swreg rreg, enum shf_sc sc) 383 { 384 if (sc == SHF_SC_R_ROT) { 385 pr_err("indirect shift is not allowed on rotation\n"); 386 nfp_prog->error = -EFAULT; 387 return; 388 } 389 390 emit_shf(nfp_prog, dst, lreg, op, rreg, sc, 0); 391 } 392 393 static void 394 __emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab, 395 u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both, 396 bool dst_lmextn, bool src_lmextn) 397 { 398 u64 insn; 399 400 insn = OP_ALU_BASE | 401 FIELD_PREP(OP_ALU_A_SRC, areg) | 402 FIELD_PREP(OP_ALU_B_SRC, breg) | 403 FIELD_PREP(OP_ALU_DST, dst) | 404 FIELD_PREP(OP_ALU_SW, swap) | 405 FIELD_PREP(OP_ALU_OP, op) | 406 FIELD_PREP(OP_ALU_DST_AB, dst_ab) | 407 FIELD_PREP(OP_ALU_WR_AB, wr_both) | 408 FIELD_PREP(OP_ALU_SRC_LMEXTN, src_lmextn) | 409 FIELD_PREP(OP_ALU_DST_LMEXTN, dst_lmextn); 410 411 nfp_prog_push(nfp_prog, insn); 412 } 413 414 static void 415 emit_alu(struct nfp_prog *nfp_prog, swreg dst, 416 swreg lreg, enum alu_op op, swreg rreg) 417 { 418 struct nfp_insn_ur_regs reg; 419 int err; 420 421 err = swreg_to_unrestricted(dst, lreg, rreg, ®); 422 if (err) { 423 nfp_prog->error = err; 424 return; 425 } 426 427 __emit_alu(nfp_prog, reg.dst, reg.dst_ab, 428 reg.areg, op, reg.breg, reg.swap, reg.wr_both, 429 reg.dst_lmextn, reg.src_lmextn); 430 } 431 432 static void 433 __emit_mul(struct nfp_prog *nfp_prog, enum alu_dst_ab dst_ab, u16 areg, 434 enum mul_type type, enum mul_step step, u16 breg, bool swap, 435 bool wr_both, bool dst_lmextn, bool src_lmextn) 436 { 437 u64 insn; 438 439 insn = OP_MUL_BASE | 440 FIELD_PREP(OP_MUL_A_SRC, areg) | 441 FIELD_PREP(OP_MUL_B_SRC, breg) | 442 FIELD_PREP(OP_MUL_STEP, step) | 443 FIELD_PREP(OP_MUL_DST_AB, dst_ab) | 444 FIELD_PREP(OP_MUL_SW, swap) | 445 FIELD_PREP(OP_MUL_TYPE, type) | 446 FIELD_PREP(OP_MUL_WR_AB, wr_both) | 447 FIELD_PREP(OP_MUL_SRC_LMEXTN, src_lmextn) | 448 FIELD_PREP(OP_MUL_DST_LMEXTN, dst_lmextn); 449 450 nfp_prog_push(nfp_prog, insn); 451 } 452 453 static void 454 emit_mul(struct nfp_prog *nfp_prog, swreg lreg, enum mul_type type, 455 enum mul_step step, swreg rreg) 456 { 457 struct nfp_insn_ur_regs reg; 458 u16 areg; 459 int err; 460 461 if (type == MUL_TYPE_START && step != MUL_STEP_NONE) { 462 nfp_prog->error = -EINVAL; 463 return; 464 } 465 466 if (step == MUL_LAST || step == MUL_LAST_2) { 467 /* When type is step and step Number is LAST or LAST2, left 468 * source is used as destination. 469 */ 470 err = swreg_to_unrestricted(lreg, reg_none(), rreg, ®); 471 areg = reg.dst; 472 } else { 473 err = swreg_to_unrestricted(reg_none(), lreg, rreg, ®); 474 areg = reg.areg; 475 } 476 477 if (err) { 478 nfp_prog->error = err; 479 return; 480 } 481 482 __emit_mul(nfp_prog, reg.dst_ab, areg, type, step, reg.breg, reg.swap, 483 reg.wr_both, reg.dst_lmextn, reg.src_lmextn); 484 } 485 486 static void 487 __emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc, 488 u8 areg, u8 bmask, u8 breg, u8 shift, bool imm8, 489 bool zero, bool swap, bool wr_both, 490 bool dst_lmextn, bool src_lmextn) 491 { 492 u64 insn; 493 494 insn = OP_LDF_BASE | 495 FIELD_PREP(OP_LDF_A_SRC, areg) | 496 FIELD_PREP(OP_LDF_SC, sc) | 497 FIELD_PREP(OP_LDF_B_SRC, breg) | 498 FIELD_PREP(OP_LDF_I8, imm8) | 499 FIELD_PREP(OP_LDF_SW, swap) | 500 FIELD_PREP(OP_LDF_ZF, zero) | 501 FIELD_PREP(OP_LDF_BMASK, bmask) | 502 FIELD_PREP(OP_LDF_SHF, shift) | 503 FIELD_PREP(OP_LDF_WR_AB, wr_both) | 504 FIELD_PREP(OP_LDF_SRC_LMEXTN, src_lmextn) | 505 FIELD_PREP(OP_LDF_DST_LMEXTN, dst_lmextn); 506 507 nfp_prog_push(nfp_prog, insn); 508 } 509 510 static void 511 emit_ld_field_any(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src, 512 enum shf_sc sc, u8 shift, bool zero) 513 { 514 struct nfp_insn_re_regs reg; 515 int err; 516 517 /* Note: ld_field is special as it uses one of the src regs as dst */ 518 err = swreg_to_restricted(dst, dst, src, ®, true); 519 if (err) { 520 nfp_prog->error = err; 521 return; 522 } 523 524 __emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift, 525 reg.i8, zero, reg.swap, reg.wr_both, 526 reg.dst_lmextn, reg.src_lmextn); 527 } 528 529 static void 530 emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src, 531 enum shf_sc sc, u8 shift) 532 { 533 emit_ld_field_any(nfp_prog, dst, bmask, src, sc, shift, false); 534 } 535 536 static void 537 __emit_lcsr(struct nfp_prog *nfp_prog, u16 areg, u16 breg, bool wr, u16 addr, 538 bool dst_lmextn, bool src_lmextn) 539 { 540 u64 insn; 541 542 insn = OP_LCSR_BASE | 543 FIELD_PREP(OP_LCSR_A_SRC, areg) | 544 FIELD_PREP(OP_LCSR_B_SRC, breg) | 545 FIELD_PREP(OP_LCSR_WRITE, wr) | 546 FIELD_PREP(OP_LCSR_ADDR, addr / 4) | 547 FIELD_PREP(OP_LCSR_SRC_LMEXTN, src_lmextn) | 548 FIELD_PREP(OP_LCSR_DST_LMEXTN, dst_lmextn); 549 550 nfp_prog_push(nfp_prog, insn); 551 } 552 553 static void emit_csr_wr(struct nfp_prog *nfp_prog, swreg src, u16 addr) 554 { 555 struct nfp_insn_ur_regs reg; 556 int err; 557 558 /* This instruction takes immeds instead of reg_none() for the ignored 559 * operand, but we can't encode 2 immeds in one instr with our normal 560 * swreg infra so if param is an immed, we encode as reg_none() and 561 * copy the immed to both operands. 562 */ 563 if (swreg_type(src) == NN_REG_IMM) { 564 err = swreg_to_unrestricted(reg_none(), src, reg_none(), ®); 565 reg.breg = reg.areg; 566 } else { 567 err = swreg_to_unrestricted(reg_none(), src, reg_imm(0), ®); 568 } 569 if (err) { 570 nfp_prog->error = err; 571 return; 572 } 573 574 __emit_lcsr(nfp_prog, reg.areg, reg.breg, true, addr, 575 false, reg.src_lmextn); 576 } 577 578 /* CSR value is read in following immed[gpr, 0] */ 579 static void __emit_csr_rd(struct nfp_prog *nfp_prog, u16 addr) 580 { 581 __emit_lcsr(nfp_prog, 0, 0, false, addr, false, false); 582 } 583 584 static void emit_nop(struct nfp_prog *nfp_prog) 585 { 586 __emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0); 587 } 588 589 /* --- Wrappers --- */ 590 static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift) 591 { 592 if (!(imm & 0xffff0000)) { 593 *val = imm; 594 *shift = IMMED_SHIFT_0B; 595 } else if (!(imm & 0xff0000ff)) { 596 *val = imm >> 8; 597 *shift = IMMED_SHIFT_1B; 598 } else if (!(imm & 0x0000ffff)) { 599 *val = imm >> 16; 600 *shift = IMMED_SHIFT_2B; 601 } else { 602 return false; 603 } 604 605 return true; 606 } 607 608 static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm) 609 { 610 enum immed_shift shift; 611 u16 val; 612 613 if (pack_immed(imm, &val, &shift)) { 614 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, false, shift); 615 } else if (pack_immed(~imm, &val, &shift)) { 616 emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, true, shift); 617 } else { 618 emit_immed(nfp_prog, dst, imm & 0xffff, IMMED_WIDTH_ALL, 619 false, IMMED_SHIFT_0B); 620 emit_immed(nfp_prog, dst, imm >> 16, IMMED_WIDTH_WORD, 621 false, IMMED_SHIFT_2B); 622 } 623 } 624 625 static void 626 wrp_zext(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, u8 dst) 627 { 628 if (meta->flags & FLAG_INSN_DO_ZEXT) 629 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 630 } 631 632 static void 633 wrp_immed_relo(struct nfp_prog *nfp_prog, swreg dst, u32 imm, 634 enum nfp_relo_type relo) 635 { 636 if (imm > 0xffff) { 637 pr_err("relocation of a large immediate!\n"); 638 nfp_prog->error = -EFAULT; 639 return; 640 } 641 emit_immed(nfp_prog, dst, imm, IMMED_WIDTH_ALL, false, IMMED_SHIFT_0B); 642 643 nfp_prog->prog[nfp_prog->prog_len - 1] |= 644 FIELD_PREP(OP_RELO_TYPE, relo); 645 } 646 647 /* ur_load_imm_any() - encode immediate or use tmp register (unrestricted) 648 * If the @imm is small enough encode it directly in operand and return 649 * otherwise load @imm to a spare register and return its encoding. 650 */ 651 static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 652 { 653 if (FIELD_FIT(UR_REG_IMM_MAX, imm)) 654 return reg_imm(imm); 655 656 wrp_immed(nfp_prog, tmp_reg, imm); 657 return tmp_reg; 658 } 659 660 /* re_load_imm_any() - encode immediate or use tmp register (restricted) 661 * If the @imm is small enough encode it directly in operand and return 662 * otherwise load @imm to a spare register and return its encoding. 663 */ 664 static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg) 665 { 666 if (FIELD_FIT(RE_REG_IMM_MAX, imm)) 667 return reg_imm(imm); 668 669 wrp_immed(nfp_prog, tmp_reg, imm); 670 return tmp_reg; 671 } 672 673 static void wrp_nops(struct nfp_prog *nfp_prog, unsigned int count) 674 { 675 while (count--) 676 emit_nop(nfp_prog); 677 } 678 679 static void wrp_mov(struct nfp_prog *nfp_prog, swreg dst, swreg src) 680 { 681 emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, src); 682 } 683 684 static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src) 685 { 686 wrp_mov(nfp_prog, reg_both(dst), reg_b(src)); 687 } 688 689 /* wrp_reg_subpart() - load @field_len bytes from @offset of @src, write the 690 * result to @dst from low end. 691 */ 692 static void 693 wrp_reg_subpart(struct nfp_prog *nfp_prog, swreg dst, swreg src, u8 field_len, 694 u8 offset) 695 { 696 enum shf_sc sc = offset ? SHF_SC_R_SHF : SHF_SC_NONE; 697 u8 mask = (1 << field_len) - 1; 698 699 emit_ld_field_any(nfp_prog, dst, mask, src, sc, offset * 8, true); 700 } 701 702 /* wrp_reg_or_subpart() - load @field_len bytes from low end of @src, or the 703 * result to @dst from offset, there is no change on the other bits of @dst. 704 */ 705 static void 706 wrp_reg_or_subpart(struct nfp_prog *nfp_prog, swreg dst, swreg src, 707 u8 field_len, u8 offset) 708 { 709 enum shf_sc sc = offset ? SHF_SC_L_SHF : SHF_SC_NONE; 710 u8 mask = ((1 << field_len) - 1) << offset; 711 712 emit_ld_field(nfp_prog, dst, mask, src, sc, 32 - offset * 8); 713 } 714 715 static void 716 addr40_offset(struct nfp_prog *nfp_prog, u8 src_gpr, swreg offset, 717 swreg *rega, swreg *regb) 718 { 719 if (offset == reg_imm(0)) { 720 *rega = reg_a(src_gpr); 721 *regb = reg_b(src_gpr + 1); 722 return; 723 } 724 725 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(src_gpr), ALU_OP_ADD, offset); 726 emit_alu(nfp_prog, imm_b(nfp_prog), reg_b(src_gpr + 1), ALU_OP_ADD_C, 727 reg_imm(0)); 728 *rega = imm_a(nfp_prog); 729 *regb = imm_b(nfp_prog); 730 } 731 732 /* NFP has Command Push Pull bus which supports bluk memory operations. */ 733 static int nfp_cpp_memcpy(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 734 { 735 bool descending_seq = meta->ldst_gather_len < 0; 736 s16 len = abs(meta->ldst_gather_len); 737 swreg src_base, off; 738 bool src_40bit_addr; 739 unsigned int i; 740 u8 xfer_num; 741 742 off = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 743 src_40bit_addr = meta->ptr.type == PTR_TO_MAP_VALUE; 744 src_base = reg_a(meta->insn.src_reg * 2); 745 xfer_num = round_up(len, 4) / 4; 746 747 if (src_40bit_addr) 748 addr40_offset(nfp_prog, meta->insn.src_reg * 2, off, &src_base, 749 &off); 750 751 /* Setup PREV_ALU fields to override memory read length. */ 752 if (len > 32) 753 wrp_immed(nfp_prog, reg_none(), 754 CMD_OVE_LEN | FIELD_PREP(CMD_OV_LEN, xfer_num - 1)); 755 756 /* Memory read from source addr into transfer-in registers. */ 757 emit_cmd_any(nfp_prog, CMD_TGT_READ32_SWAP, 758 src_40bit_addr ? CMD_MODE_40b_BA : CMD_MODE_32b, 0, 759 src_base, off, xfer_num - 1, CMD_CTX_SWAP, len > 32); 760 761 /* Move from transfer-in to transfer-out. */ 762 for (i = 0; i < xfer_num; i++) 763 wrp_mov(nfp_prog, reg_xfer(i), reg_xfer(i)); 764 765 off = re_load_imm_any(nfp_prog, meta->paired_st->off, imm_b(nfp_prog)); 766 767 if (len <= 8) { 768 /* Use single direct_ref write8. */ 769 emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0, 770 reg_a(meta->paired_st->dst_reg * 2), off, len - 1, 771 CMD_CTX_SWAP); 772 } else if (len <= 32 && IS_ALIGNED(len, 4)) { 773 /* Use single direct_ref write32. */ 774 emit_cmd(nfp_prog, CMD_TGT_WRITE32_SWAP, CMD_MODE_32b, 0, 775 reg_a(meta->paired_st->dst_reg * 2), off, xfer_num - 1, 776 CMD_CTX_SWAP); 777 } else if (len <= 32) { 778 /* Use single indirect_ref write8. */ 779 wrp_immed(nfp_prog, reg_none(), 780 CMD_OVE_LEN | FIELD_PREP(CMD_OV_LEN, len - 1)); 781 emit_cmd_indir(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0, 782 reg_a(meta->paired_st->dst_reg * 2), off, 783 len - 1, CMD_CTX_SWAP); 784 } else if (IS_ALIGNED(len, 4)) { 785 /* Use single indirect_ref write32. */ 786 wrp_immed(nfp_prog, reg_none(), 787 CMD_OVE_LEN | FIELD_PREP(CMD_OV_LEN, xfer_num - 1)); 788 emit_cmd_indir(nfp_prog, CMD_TGT_WRITE32_SWAP, CMD_MODE_32b, 0, 789 reg_a(meta->paired_st->dst_reg * 2), off, 790 xfer_num - 1, CMD_CTX_SWAP); 791 } else if (len <= 40) { 792 /* Use one direct_ref write32 to write the first 32-bytes, then 793 * another direct_ref write8 to write the remaining bytes. 794 */ 795 emit_cmd(nfp_prog, CMD_TGT_WRITE32_SWAP, CMD_MODE_32b, 0, 796 reg_a(meta->paired_st->dst_reg * 2), off, 7, 797 CMD_CTX_SWAP); 798 799 off = re_load_imm_any(nfp_prog, meta->paired_st->off + 32, 800 imm_b(nfp_prog)); 801 emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 8, 802 reg_a(meta->paired_st->dst_reg * 2), off, len - 33, 803 CMD_CTX_SWAP); 804 } else { 805 /* Use one indirect_ref write32 to write 4-bytes aligned length, 806 * then another direct_ref write8 to write the remaining bytes. 807 */ 808 u8 new_off; 809 810 wrp_immed(nfp_prog, reg_none(), 811 CMD_OVE_LEN | FIELD_PREP(CMD_OV_LEN, xfer_num - 2)); 812 emit_cmd_indir(nfp_prog, CMD_TGT_WRITE32_SWAP, CMD_MODE_32b, 0, 813 reg_a(meta->paired_st->dst_reg * 2), off, 814 xfer_num - 2, CMD_CTX_SWAP); 815 new_off = meta->paired_st->off + (xfer_num - 1) * 4; 816 off = re_load_imm_any(nfp_prog, new_off, imm_b(nfp_prog)); 817 emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 818 xfer_num - 1, reg_a(meta->paired_st->dst_reg * 2), off, 819 (len & 0x3) - 1, CMD_CTX_SWAP); 820 } 821 822 /* TODO: The following extra load is to make sure data flow be identical 823 * before and after we do memory copy optimization. 824 * 825 * The load destination register is not guaranteed to be dead, so we 826 * need to make sure it is loaded with the value the same as before 827 * this transformation. 828 * 829 * These extra loads could be removed once we have accurate register 830 * usage information. 831 */ 832 if (descending_seq) 833 xfer_num = 0; 834 else if (BPF_SIZE(meta->insn.code) != BPF_DW) 835 xfer_num = xfer_num - 1; 836 else 837 xfer_num = xfer_num - 2; 838 839 switch (BPF_SIZE(meta->insn.code)) { 840 case BPF_B: 841 wrp_reg_subpart(nfp_prog, reg_both(meta->insn.dst_reg * 2), 842 reg_xfer(xfer_num), 1, 843 IS_ALIGNED(len, 4) ? 3 : (len & 3) - 1); 844 break; 845 case BPF_H: 846 wrp_reg_subpart(nfp_prog, reg_both(meta->insn.dst_reg * 2), 847 reg_xfer(xfer_num), 2, (len & 3) ^ 2); 848 break; 849 case BPF_W: 850 wrp_mov(nfp_prog, reg_both(meta->insn.dst_reg * 2), 851 reg_xfer(0)); 852 break; 853 case BPF_DW: 854 wrp_mov(nfp_prog, reg_both(meta->insn.dst_reg * 2), 855 reg_xfer(xfer_num)); 856 wrp_mov(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 857 reg_xfer(xfer_num + 1)); 858 break; 859 } 860 861 if (BPF_SIZE(meta->insn.code) != BPF_DW) 862 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 863 864 return 0; 865 } 866 867 static int 868 data_ld(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, swreg offset, 869 u8 dst_gpr, int size) 870 { 871 unsigned int i; 872 u16 shift, sz; 873 874 /* We load the value from the address indicated in @offset and then 875 * shift out the data we don't need. Note: this is big endian! 876 */ 877 sz = max(size, 4); 878 shift = size < 4 ? 4 - size : 0; 879 880 emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0, 881 pptr_reg(nfp_prog), offset, sz - 1, CMD_CTX_SWAP); 882 883 i = 0; 884 if (shift) 885 emit_shf(nfp_prog, reg_both(dst_gpr), reg_none(), SHF_OP_NONE, 886 reg_xfer(0), SHF_SC_R_SHF, shift * 8); 887 else 888 for (; i * 4 < size; i++) 889 wrp_mov(nfp_prog, reg_both(dst_gpr + i), reg_xfer(i)); 890 891 if (i < 2) 892 wrp_zext(nfp_prog, meta, dst_gpr); 893 894 return 0; 895 } 896 897 static int 898 data_ld_host_order(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 899 u8 dst_gpr, swreg lreg, swreg rreg, int size, 900 enum cmd_mode mode) 901 { 902 unsigned int i; 903 u8 mask, sz; 904 905 /* We load the value from the address indicated in rreg + lreg and then 906 * mask out the data we don't need. Note: this is little endian! 907 */ 908 sz = max(size, 4); 909 mask = size < 4 ? GENMASK(size - 1, 0) : 0; 910 911 emit_cmd(nfp_prog, CMD_TGT_READ32_SWAP, mode, 0, 912 lreg, rreg, sz / 4 - 1, CMD_CTX_SWAP); 913 914 i = 0; 915 if (mask) 916 emit_ld_field_any(nfp_prog, reg_both(dst_gpr), mask, 917 reg_xfer(0), SHF_SC_NONE, 0, true); 918 else 919 for (; i * 4 < size; i++) 920 wrp_mov(nfp_prog, reg_both(dst_gpr + i), reg_xfer(i)); 921 922 if (i < 2) 923 wrp_zext(nfp_prog, meta, dst_gpr); 924 925 return 0; 926 } 927 928 static int 929 data_ld_host_order_addr32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 930 u8 src_gpr, swreg offset, u8 dst_gpr, u8 size) 931 { 932 return data_ld_host_order(nfp_prog, meta, dst_gpr, reg_a(src_gpr), 933 offset, size, CMD_MODE_32b); 934 } 935 936 static int 937 data_ld_host_order_addr40(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 938 u8 src_gpr, swreg offset, u8 dst_gpr, u8 size) 939 { 940 swreg rega, regb; 941 942 addr40_offset(nfp_prog, src_gpr, offset, ®a, ®b); 943 944 return data_ld_host_order(nfp_prog, meta, dst_gpr, rega, regb, 945 size, CMD_MODE_40b_BA); 946 } 947 948 static int 949 construct_data_ind_ld(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 950 u16 offset, u16 src, u8 size) 951 { 952 swreg tmp_reg; 953 954 /* Calculate the true offset (src_reg + imm) */ 955 tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 956 emit_alu(nfp_prog, imm_both(nfp_prog), reg_a(src), ALU_OP_ADD, tmp_reg); 957 958 /* Check packet length (size guaranteed to fit b/c it's u8) */ 959 emit_alu(nfp_prog, imm_a(nfp_prog), 960 imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size)); 961 emit_alu(nfp_prog, reg_none(), 962 plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog)); 963 emit_br_relo(nfp_prog, BR_BLO, BR_OFF_RELO, 0, RELO_BR_GO_ABORT); 964 965 /* Load data */ 966 return data_ld(nfp_prog, meta, imm_b(nfp_prog), 0, size); 967 } 968 969 static int 970 construct_data_ld(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 971 u16 offset, u8 size) 972 { 973 swreg tmp_reg; 974 975 /* Check packet length */ 976 tmp_reg = ur_load_imm_any(nfp_prog, offset + size, imm_a(nfp_prog)); 977 emit_alu(nfp_prog, reg_none(), plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg); 978 emit_br_relo(nfp_prog, BR_BLO, BR_OFF_RELO, 0, RELO_BR_GO_ABORT); 979 980 /* Load data */ 981 tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); 982 return data_ld(nfp_prog, meta, tmp_reg, 0, size); 983 } 984 985 static int 986 data_stx_host_order(struct nfp_prog *nfp_prog, u8 dst_gpr, swreg offset, 987 u8 src_gpr, u8 size) 988 { 989 unsigned int i; 990 991 for (i = 0; i * 4 < size; i++) 992 wrp_mov(nfp_prog, reg_xfer(i), reg_a(src_gpr + i)); 993 994 emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0, 995 reg_a(dst_gpr), offset, size - 1, CMD_CTX_SWAP); 996 997 return 0; 998 } 999 1000 static int 1001 data_st_host_order(struct nfp_prog *nfp_prog, u8 dst_gpr, swreg offset, 1002 u64 imm, u8 size) 1003 { 1004 wrp_immed(nfp_prog, reg_xfer(0), imm); 1005 if (size == 8) 1006 wrp_immed(nfp_prog, reg_xfer(1), imm >> 32); 1007 1008 emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0, 1009 reg_a(dst_gpr), offset, size - 1, CMD_CTX_SWAP); 1010 1011 return 0; 1012 } 1013 1014 typedef int 1015 (*lmem_step)(struct nfp_prog *nfp_prog, u8 gpr, u8 gpr_byte, s32 off, 1016 unsigned int size, bool first, bool new_gpr, bool last, bool lm3, 1017 bool needs_inc); 1018 1019 static int 1020 wrp_lmem_load(struct nfp_prog *nfp_prog, u8 dst, u8 dst_byte, s32 off, 1021 unsigned int size, bool first, bool new_gpr, bool last, bool lm3, 1022 bool needs_inc) 1023 { 1024 bool should_inc = needs_inc && new_gpr && !last; 1025 u32 idx, src_byte; 1026 enum shf_sc sc; 1027 swreg reg; 1028 int shf; 1029 u8 mask; 1030 1031 if (WARN_ON_ONCE(dst_byte + size > 4 || off % 4 + size > 4)) 1032 return -EOPNOTSUPP; 1033 1034 idx = off / 4; 1035 1036 /* Move the entire word */ 1037 if (size == 4) { 1038 wrp_mov(nfp_prog, reg_both(dst), 1039 should_inc ? reg_lm_inc(3) : reg_lm(lm3 ? 3 : 0, idx)); 1040 return 0; 1041 } 1042 1043 if (WARN_ON_ONCE(lm3 && idx > RE_REG_LM_IDX_MAX)) 1044 return -EOPNOTSUPP; 1045 1046 src_byte = off % 4; 1047 1048 mask = (1 << size) - 1; 1049 mask <<= dst_byte; 1050 1051 if (WARN_ON_ONCE(mask > 0xf)) 1052 return -EOPNOTSUPP; 1053 1054 shf = abs(src_byte - dst_byte) * 8; 1055 if (src_byte == dst_byte) { 1056 sc = SHF_SC_NONE; 1057 } else if (src_byte < dst_byte) { 1058 shf = 32 - shf; 1059 sc = SHF_SC_L_SHF; 1060 } else { 1061 sc = SHF_SC_R_SHF; 1062 } 1063 1064 /* ld_field can address fewer indexes, if offset too large do RMW. 1065 * Because we RMV twice we waste 2 cycles on unaligned 8 byte writes. 1066 */ 1067 if (idx <= RE_REG_LM_IDX_MAX) { 1068 reg = reg_lm(lm3 ? 3 : 0, idx); 1069 } else { 1070 reg = imm_a(nfp_prog); 1071 /* If it's not the first part of the load and we start a new GPR 1072 * that means we are loading a second part of the LMEM word into 1073 * a new GPR. IOW we've already looked that LMEM word and 1074 * therefore it has been loaded into imm_a(). 1075 */ 1076 if (first || !new_gpr) 1077 wrp_mov(nfp_prog, reg, reg_lm(0, idx)); 1078 } 1079 1080 emit_ld_field_any(nfp_prog, reg_both(dst), mask, reg, sc, shf, new_gpr); 1081 1082 if (should_inc) 1083 wrp_mov(nfp_prog, reg_none(), reg_lm_inc(3)); 1084 1085 return 0; 1086 } 1087 1088 static int 1089 wrp_lmem_store(struct nfp_prog *nfp_prog, u8 src, u8 src_byte, s32 off, 1090 unsigned int size, bool first, bool new_gpr, bool last, bool lm3, 1091 bool needs_inc) 1092 { 1093 bool should_inc = needs_inc && new_gpr && !last; 1094 u32 idx, dst_byte; 1095 enum shf_sc sc; 1096 swreg reg; 1097 int shf; 1098 u8 mask; 1099 1100 if (WARN_ON_ONCE(src_byte + size > 4 || off % 4 + size > 4)) 1101 return -EOPNOTSUPP; 1102 1103 idx = off / 4; 1104 1105 /* Move the entire word */ 1106 if (size == 4) { 1107 wrp_mov(nfp_prog, 1108 should_inc ? reg_lm_inc(3) : reg_lm(lm3 ? 3 : 0, idx), 1109 reg_b(src)); 1110 return 0; 1111 } 1112 1113 if (WARN_ON_ONCE(lm3 && idx > RE_REG_LM_IDX_MAX)) 1114 return -EOPNOTSUPP; 1115 1116 dst_byte = off % 4; 1117 1118 mask = (1 << size) - 1; 1119 mask <<= dst_byte; 1120 1121 if (WARN_ON_ONCE(mask > 0xf)) 1122 return -EOPNOTSUPP; 1123 1124 shf = abs(src_byte - dst_byte) * 8; 1125 if (src_byte == dst_byte) { 1126 sc = SHF_SC_NONE; 1127 } else if (src_byte < dst_byte) { 1128 shf = 32 - shf; 1129 sc = SHF_SC_L_SHF; 1130 } else { 1131 sc = SHF_SC_R_SHF; 1132 } 1133 1134 /* ld_field can address fewer indexes, if offset too large do RMW. 1135 * Because we RMV twice we waste 2 cycles on unaligned 8 byte writes. 1136 */ 1137 if (idx <= RE_REG_LM_IDX_MAX) { 1138 reg = reg_lm(lm3 ? 3 : 0, idx); 1139 } else { 1140 reg = imm_a(nfp_prog); 1141 /* Only first and last LMEM locations are going to need RMW, 1142 * the middle location will be overwritten fully. 1143 */ 1144 if (first || last) 1145 wrp_mov(nfp_prog, reg, reg_lm(0, idx)); 1146 } 1147 1148 emit_ld_field(nfp_prog, reg, mask, reg_b(src), sc, shf); 1149 1150 if (new_gpr || last) { 1151 if (idx > RE_REG_LM_IDX_MAX) 1152 wrp_mov(nfp_prog, reg_lm(0, idx), reg); 1153 if (should_inc) 1154 wrp_mov(nfp_prog, reg_none(), reg_lm_inc(3)); 1155 } 1156 1157 return 0; 1158 } 1159 1160 static int 1161 mem_op_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1162 unsigned int size, unsigned int ptr_off, u8 gpr, u8 ptr_gpr, 1163 bool clr_gpr, lmem_step step) 1164 { 1165 s32 off = nfp_prog->stack_frame_depth + meta->insn.off + ptr_off; 1166 bool first = true, narrow_ld, last; 1167 bool needs_inc = false; 1168 swreg stack_off_reg; 1169 u8 prev_gpr = 255; 1170 u32 gpr_byte = 0; 1171 bool lm3 = true; 1172 int ret; 1173 1174 if (meta->ptr_not_const || 1175 meta->flags & FLAG_INSN_PTR_CALLER_STACK_FRAME) { 1176 /* Use of the last encountered ptr_off is OK, they all have 1177 * the same alignment. Depend on low bits of value being 1178 * discarded when written to LMaddr register. 1179 */ 1180 stack_off_reg = ur_load_imm_any(nfp_prog, meta->insn.off, 1181 stack_imm(nfp_prog)); 1182 1183 emit_alu(nfp_prog, imm_b(nfp_prog), 1184 reg_a(ptr_gpr), ALU_OP_ADD, stack_off_reg); 1185 1186 needs_inc = true; 1187 } else if (off + size <= 64) { 1188 /* We can reach bottom 64B with LMaddr0 */ 1189 lm3 = false; 1190 } else if (round_down(off, 32) == round_down(off + size - 1, 32)) { 1191 /* We have to set up a new pointer. If we know the offset 1192 * and the entire access falls into a single 32 byte aligned 1193 * window we won't have to increment the LM pointer. 1194 * The 32 byte alignment is imporant because offset is ORed in 1195 * not added when doing *l$indexN[off]. 1196 */ 1197 stack_off_reg = ur_load_imm_any(nfp_prog, round_down(off, 32), 1198 stack_imm(nfp_prog)); 1199 emit_alu(nfp_prog, imm_b(nfp_prog), 1200 stack_reg(nfp_prog), ALU_OP_ADD, stack_off_reg); 1201 1202 off %= 32; 1203 } else { 1204 stack_off_reg = ur_load_imm_any(nfp_prog, round_down(off, 4), 1205 stack_imm(nfp_prog)); 1206 1207 emit_alu(nfp_prog, imm_b(nfp_prog), 1208 stack_reg(nfp_prog), ALU_OP_ADD, stack_off_reg); 1209 1210 needs_inc = true; 1211 } 1212 1213 narrow_ld = clr_gpr && size < 8; 1214 1215 if (lm3) { 1216 unsigned int nop_cnt; 1217 1218 emit_csr_wr(nfp_prog, imm_b(nfp_prog), NFP_CSR_ACT_LM_ADDR3); 1219 /* For size < 4 one slot will be filled by zeroing of upper, 1220 * but be careful, that zeroing could be eliminated by zext 1221 * optimization. 1222 */ 1223 nop_cnt = narrow_ld && meta->flags & FLAG_INSN_DO_ZEXT ? 2 : 3; 1224 wrp_nops(nfp_prog, nop_cnt); 1225 } 1226 1227 if (narrow_ld) 1228 wrp_zext(nfp_prog, meta, gpr); 1229 1230 while (size) { 1231 u32 slice_end; 1232 u8 slice_size; 1233 1234 slice_size = min(size, 4 - gpr_byte); 1235 slice_end = min(off + slice_size, round_up(off + 1, 4)); 1236 slice_size = slice_end - off; 1237 1238 last = slice_size == size; 1239 1240 if (needs_inc) 1241 off %= 4; 1242 1243 ret = step(nfp_prog, gpr, gpr_byte, off, slice_size, 1244 first, gpr != prev_gpr, last, lm3, needs_inc); 1245 if (ret) 1246 return ret; 1247 1248 prev_gpr = gpr; 1249 first = false; 1250 1251 gpr_byte += slice_size; 1252 if (gpr_byte >= 4) { 1253 gpr_byte -= 4; 1254 gpr++; 1255 } 1256 1257 size -= slice_size; 1258 off += slice_size; 1259 } 1260 1261 return 0; 1262 } 1263 1264 static void 1265 wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm) 1266 { 1267 swreg tmp_reg; 1268 1269 if (alu_op == ALU_OP_AND) { 1270 if (!imm) 1271 wrp_immed(nfp_prog, reg_both(dst), 0); 1272 if (!imm || !~imm) 1273 return; 1274 } 1275 if (alu_op == ALU_OP_OR) { 1276 if (!~imm) 1277 wrp_immed(nfp_prog, reg_both(dst), ~0U); 1278 if (!imm || !~imm) 1279 return; 1280 } 1281 if (alu_op == ALU_OP_XOR) { 1282 if (!~imm) 1283 emit_alu(nfp_prog, reg_both(dst), reg_none(), 1284 ALU_OP_NOT, reg_b(dst)); 1285 if (!imm || !~imm) 1286 return; 1287 } 1288 1289 tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 1290 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg); 1291 } 1292 1293 static int 1294 wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1295 enum alu_op alu_op, bool skip) 1296 { 1297 const struct bpf_insn *insn = &meta->insn; 1298 u64 imm = insn->imm; /* sign extend */ 1299 1300 if (skip) { 1301 meta->flags |= FLAG_INSN_SKIP_NOOP; 1302 return 0; 1303 } 1304 1305 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U); 1306 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32); 1307 1308 return 0; 1309 } 1310 1311 static int 1312 wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1313 enum alu_op alu_op) 1314 { 1315 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 1316 1317 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 1318 emit_alu(nfp_prog, reg_both(dst + 1), 1319 reg_a(dst + 1), alu_op, reg_b(src + 1)); 1320 1321 return 0; 1322 } 1323 1324 static int 1325 wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1326 enum alu_op alu_op) 1327 { 1328 const struct bpf_insn *insn = &meta->insn; 1329 u8 dst = insn->dst_reg * 2; 1330 1331 wrp_alu_imm(nfp_prog, dst, alu_op, insn->imm); 1332 wrp_zext(nfp_prog, meta, dst); 1333 1334 return 0; 1335 } 1336 1337 static int 1338 wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1339 enum alu_op alu_op) 1340 { 1341 u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2; 1342 1343 emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src)); 1344 wrp_zext(nfp_prog, meta, dst); 1345 1346 return 0; 1347 } 1348 1349 static void 1350 wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src, 1351 enum br_mask br_mask, u16 off) 1352 { 1353 emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src)); 1354 emit_br(nfp_prog, br_mask, off, 0); 1355 } 1356 1357 static int 1358 wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1359 enum alu_op alu_op, enum br_mask br_mask) 1360 { 1361 const struct bpf_insn *insn = &meta->insn; 1362 1363 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op, 1364 insn->src_reg * 2, br_mask, insn->off); 1365 if (is_mbpf_jmp64(meta)) 1366 wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op, 1367 insn->src_reg * 2 + 1, br_mask, insn->off); 1368 1369 return 0; 1370 } 1371 1372 static const struct jmp_code_map { 1373 enum br_mask br_mask; 1374 bool swap; 1375 } jmp_code_map[] = { 1376 [BPF_JGT >> 4] = { BR_BLO, true }, 1377 [BPF_JGE >> 4] = { BR_BHS, false }, 1378 [BPF_JLT >> 4] = { BR_BLO, false }, 1379 [BPF_JLE >> 4] = { BR_BHS, true }, 1380 [BPF_JSGT >> 4] = { BR_BLT, true }, 1381 [BPF_JSGE >> 4] = { BR_BGE, false }, 1382 [BPF_JSLT >> 4] = { BR_BLT, false }, 1383 [BPF_JSLE >> 4] = { BR_BGE, true }, 1384 }; 1385 1386 static const struct jmp_code_map *nfp_jmp_code_get(struct nfp_insn_meta *meta) 1387 { 1388 unsigned int op; 1389 1390 op = BPF_OP(meta->insn.code) >> 4; 1391 /* br_mask of 0 is BR_BEQ which we don't use in jump code table */ 1392 if (WARN_ONCE(op >= ARRAY_SIZE(jmp_code_map) || 1393 !jmp_code_map[op].br_mask, 1394 "no code found for jump instruction")) 1395 return NULL; 1396 1397 return &jmp_code_map[op]; 1398 } 1399 1400 static int cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1401 { 1402 const struct bpf_insn *insn = &meta->insn; 1403 u64 imm = insn->imm; /* sign extend */ 1404 const struct jmp_code_map *code; 1405 enum alu_op alu_op, carry_op; 1406 u8 reg = insn->dst_reg * 2; 1407 swreg tmp_reg; 1408 1409 code = nfp_jmp_code_get(meta); 1410 if (!code) 1411 return -EINVAL; 1412 1413 alu_op = meta->jump_neg_op ? ALU_OP_ADD : ALU_OP_SUB; 1414 carry_op = meta->jump_neg_op ? ALU_OP_ADD_C : ALU_OP_SUB_C; 1415 1416 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 1417 if (!code->swap) 1418 emit_alu(nfp_prog, reg_none(), reg_a(reg), alu_op, tmp_reg); 1419 else 1420 emit_alu(nfp_prog, reg_none(), tmp_reg, alu_op, reg_a(reg)); 1421 1422 if (is_mbpf_jmp64(meta)) { 1423 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 1424 if (!code->swap) 1425 emit_alu(nfp_prog, reg_none(), 1426 reg_a(reg + 1), carry_op, tmp_reg); 1427 else 1428 emit_alu(nfp_prog, reg_none(), 1429 tmp_reg, carry_op, reg_a(reg + 1)); 1430 } 1431 1432 emit_br(nfp_prog, code->br_mask, insn->off, 0); 1433 1434 return 0; 1435 } 1436 1437 static int cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1438 { 1439 const struct bpf_insn *insn = &meta->insn; 1440 const struct jmp_code_map *code; 1441 u8 areg, breg; 1442 1443 code = nfp_jmp_code_get(meta); 1444 if (!code) 1445 return -EINVAL; 1446 1447 areg = insn->dst_reg * 2; 1448 breg = insn->src_reg * 2; 1449 1450 if (code->swap) { 1451 areg ^= breg; 1452 breg ^= areg; 1453 areg ^= breg; 1454 } 1455 1456 emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg)); 1457 if (is_mbpf_jmp64(meta)) 1458 emit_alu(nfp_prog, reg_none(), 1459 reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1)); 1460 emit_br(nfp_prog, code->br_mask, insn->off, 0); 1461 1462 return 0; 1463 } 1464 1465 static void wrp_end32(struct nfp_prog *nfp_prog, swreg reg_in, u8 gpr_out) 1466 { 1467 emit_ld_field(nfp_prog, reg_both(gpr_out), 0xf, reg_in, 1468 SHF_SC_R_ROT, 8); 1469 emit_ld_field(nfp_prog, reg_both(gpr_out), 0x5, reg_a(gpr_out), 1470 SHF_SC_R_ROT, 16); 1471 } 1472 1473 static void 1474 wrp_mul_u32(struct nfp_prog *nfp_prog, swreg dst_hi, swreg dst_lo, swreg lreg, 1475 swreg rreg, bool gen_high_half) 1476 { 1477 emit_mul(nfp_prog, lreg, MUL_TYPE_START, MUL_STEP_NONE, rreg); 1478 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_32x32, MUL_STEP_1, rreg); 1479 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_32x32, MUL_STEP_2, rreg); 1480 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_32x32, MUL_STEP_3, rreg); 1481 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_32x32, MUL_STEP_4, rreg); 1482 emit_mul(nfp_prog, dst_lo, MUL_TYPE_STEP_32x32, MUL_LAST, reg_none()); 1483 if (gen_high_half) 1484 emit_mul(nfp_prog, dst_hi, MUL_TYPE_STEP_32x32, MUL_LAST_2, 1485 reg_none()); 1486 else 1487 wrp_immed(nfp_prog, dst_hi, 0); 1488 } 1489 1490 static void 1491 wrp_mul_u16(struct nfp_prog *nfp_prog, swreg dst_hi, swreg dst_lo, swreg lreg, 1492 swreg rreg) 1493 { 1494 emit_mul(nfp_prog, lreg, MUL_TYPE_START, MUL_STEP_NONE, rreg); 1495 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_16x16, MUL_STEP_1, rreg); 1496 emit_mul(nfp_prog, lreg, MUL_TYPE_STEP_16x16, MUL_STEP_2, rreg); 1497 emit_mul(nfp_prog, dst_lo, MUL_TYPE_STEP_16x16, MUL_LAST, reg_none()); 1498 } 1499 1500 static int 1501 wrp_mul(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 1502 bool gen_high_half, bool ropnd_from_reg) 1503 { 1504 swreg multiplier, multiplicand, dst_hi, dst_lo; 1505 const struct bpf_insn *insn = &meta->insn; 1506 u32 lopnd_max, ropnd_max; 1507 u8 dst_reg; 1508 1509 dst_reg = insn->dst_reg; 1510 multiplicand = reg_a(dst_reg * 2); 1511 dst_hi = reg_both(dst_reg * 2 + 1); 1512 dst_lo = reg_both(dst_reg * 2); 1513 lopnd_max = meta->umax_dst; 1514 if (ropnd_from_reg) { 1515 multiplier = reg_b(insn->src_reg * 2); 1516 ropnd_max = meta->umax_src; 1517 } else { 1518 u32 imm = insn->imm; 1519 1520 multiplier = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 1521 ropnd_max = imm; 1522 } 1523 if (lopnd_max > U16_MAX || ropnd_max > U16_MAX) 1524 wrp_mul_u32(nfp_prog, dst_hi, dst_lo, multiplicand, multiplier, 1525 gen_high_half); 1526 else 1527 wrp_mul_u16(nfp_prog, dst_hi, dst_lo, multiplicand, multiplier); 1528 1529 return 0; 1530 } 1531 1532 static int wrp_div_imm(struct nfp_prog *nfp_prog, u8 dst, u64 imm) 1533 { 1534 swreg dst_both = reg_both(dst), dst_a = reg_a(dst), dst_b = reg_a(dst); 1535 struct reciprocal_value_adv rvalue; 1536 u8 pre_shift, exp; 1537 swreg magic; 1538 1539 if (imm > U32_MAX) { 1540 wrp_immed(nfp_prog, dst_both, 0); 1541 return 0; 1542 } 1543 1544 /* NOTE: because we are using "reciprocal_value_adv" which doesn't 1545 * support "divisor > (1u << 31)", we need to JIT separate NFP sequence 1546 * to handle such case which actually equals to the result of unsigned 1547 * comparison "dst >= imm" which could be calculated using the following 1548 * NFP sequence: 1549 * 1550 * alu[--, dst, -, imm] 1551 * immed[imm, 0] 1552 * alu[dst, imm, +carry, 0] 1553 * 1554 */ 1555 if (imm > 1U << 31) { 1556 swreg tmp_b = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog)); 1557 1558 emit_alu(nfp_prog, reg_none(), dst_a, ALU_OP_SUB, tmp_b); 1559 wrp_immed(nfp_prog, imm_a(nfp_prog), 0); 1560 emit_alu(nfp_prog, dst_both, imm_a(nfp_prog), ALU_OP_ADD_C, 1561 reg_imm(0)); 1562 return 0; 1563 } 1564 1565 rvalue = reciprocal_value_adv(imm, 32); 1566 exp = rvalue.exp; 1567 if (rvalue.is_wide_m && !(imm & 1)) { 1568 pre_shift = fls(imm & -imm) - 1; 1569 rvalue = reciprocal_value_adv(imm >> pre_shift, 32 - pre_shift); 1570 } else { 1571 pre_shift = 0; 1572 } 1573 magic = ur_load_imm_any(nfp_prog, rvalue.m, imm_b(nfp_prog)); 1574 if (imm == 1U << exp) { 1575 emit_shf(nfp_prog, dst_both, reg_none(), SHF_OP_NONE, dst_b, 1576 SHF_SC_R_SHF, exp); 1577 } else if (rvalue.is_wide_m) { 1578 wrp_mul_u32(nfp_prog, imm_both(nfp_prog), reg_none(), dst_a, 1579 magic, true); 1580 emit_alu(nfp_prog, dst_both, dst_a, ALU_OP_SUB, 1581 imm_b(nfp_prog)); 1582 emit_shf(nfp_prog, dst_both, reg_none(), SHF_OP_NONE, dst_b, 1583 SHF_SC_R_SHF, 1); 1584 emit_alu(nfp_prog, dst_both, dst_a, ALU_OP_ADD, 1585 imm_b(nfp_prog)); 1586 emit_shf(nfp_prog, dst_both, reg_none(), SHF_OP_NONE, dst_b, 1587 SHF_SC_R_SHF, rvalue.sh - 1); 1588 } else { 1589 if (pre_shift) 1590 emit_shf(nfp_prog, dst_both, reg_none(), SHF_OP_NONE, 1591 dst_b, SHF_SC_R_SHF, pre_shift); 1592 wrp_mul_u32(nfp_prog, dst_both, reg_none(), dst_a, magic, true); 1593 emit_shf(nfp_prog, dst_both, reg_none(), SHF_OP_NONE, 1594 dst_b, SHF_SC_R_SHF, rvalue.sh); 1595 } 1596 1597 return 0; 1598 } 1599 1600 static int adjust_head(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1601 { 1602 swreg tmp = imm_a(nfp_prog), tmp_len = imm_b(nfp_prog); 1603 struct nfp_bpf_cap_adjust_head *adjust_head; 1604 u32 ret_einval, end; 1605 1606 adjust_head = &nfp_prog->bpf->adjust_head; 1607 1608 /* Optimized version - 5 vs 14 cycles */ 1609 if (nfp_prog->adjust_head_location != UINT_MAX) { 1610 if (WARN_ON_ONCE(nfp_prog->adjust_head_location != meta->n)) 1611 return -EINVAL; 1612 1613 emit_alu(nfp_prog, pptr_reg(nfp_prog), 1614 reg_a(2 * 2), ALU_OP_ADD, pptr_reg(nfp_prog)); 1615 emit_alu(nfp_prog, plen_reg(nfp_prog), 1616 plen_reg(nfp_prog), ALU_OP_SUB, reg_a(2 * 2)); 1617 emit_alu(nfp_prog, pv_len(nfp_prog), 1618 pv_len(nfp_prog), ALU_OP_SUB, reg_a(2 * 2)); 1619 1620 wrp_immed(nfp_prog, reg_both(0), 0); 1621 wrp_immed(nfp_prog, reg_both(1), 0); 1622 1623 /* TODO: when adjust head is guaranteed to succeed we can 1624 * also eliminate the following if (r0 == 0) branch. 1625 */ 1626 1627 return 0; 1628 } 1629 1630 ret_einval = nfp_prog_current_offset(nfp_prog) + 14; 1631 end = ret_einval + 2; 1632 1633 /* We need to use a temp because offset is just a part of the pkt ptr */ 1634 emit_alu(nfp_prog, tmp, 1635 reg_a(2 * 2), ALU_OP_ADD_2B, pptr_reg(nfp_prog)); 1636 1637 /* Validate result will fit within FW datapath constraints */ 1638 emit_alu(nfp_prog, reg_none(), 1639 tmp, ALU_OP_SUB, reg_imm(adjust_head->off_min)); 1640 emit_br(nfp_prog, BR_BLO, ret_einval, 0); 1641 emit_alu(nfp_prog, reg_none(), 1642 reg_imm(adjust_head->off_max), ALU_OP_SUB, tmp); 1643 emit_br(nfp_prog, BR_BLO, ret_einval, 0); 1644 1645 /* Validate the length is at least ETH_HLEN */ 1646 emit_alu(nfp_prog, tmp_len, 1647 plen_reg(nfp_prog), ALU_OP_SUB, reg_a(2 * 2)); 1648 emit_alu(nfp_prog, reg_none(), 1649 tmp_len, ALU_OP_SUB, reg_imm(ETH_HLEN)); 1650 emit_br(nfp_prog, BR_BMI, ret_einval, 0); 1651 1652 /* Load the ret code */ 1653 wrp_immed(nfp_prog, reg_both(0), 0); 1654 wrp_immed(nfp_prog, reg_both(1), 0); 1655 1656 /* Modify the packet metadata */ 1657 emit_ld_field(nfp_prog, pptr_reg(nfp_prog), 0x3, tmp, SHF_SC_NONE, 0); 1658 1659 /* Skip over the -EINVAL ret code (defer 2) */ 1660 emit_br(nfp_prog, BR_UNC, end, 2); 1661 1662 emit_alu(nfp_prog, plen_reg(nfp_prog), 1663 plen_reg(nfp_prog), ALU_OP_SUB, reg_a(2 * 2)); 1664 emit_alu(nfp_prog, pv_len(nfp_prog), 1665 pv_len(nfp_prog), ALU_OP_SUB, reg_a(2 * 2)); 1666 1667 /* return -EINVAL target */ 1668 if (!nfp_prog_confirm_current_offset(nfp_prog, ret_einval)) 1669 return -EINVAL; 1670 1671 wrp_immed(nfp_prog, reg_both(0), -22); 1672 wrp_immed(nfp_prog, reg_both(1), ~0); 1673 1674 if (!nfp_prog_confirm_current_offset(nfp_prog, end)) 1675 return -EINVAL; 1676 1677 return 0; 1678 } 1679 1680 static int adjust_tail(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1681 { 1682 u32 ret_einval, end; 1683 swreg plen, delta; 1684 1685 BUILD_BUG_ON(plen_reg(nfp_prog) != reg_b(STATIC_REG_PKT_LEN)); 1686 1687 plen = imm_a(nfp_prog); 1688 delta = reg_a(2 * 2); 1689 1690 ret_einval = nfp_prog_current_offset(nfp_prog) + 9; 1691 end = nfp_prog_current_offset(nfp_prog) + 11; 1692 1693 /* Calculate resulting length */ 1694 emit_alu(nfp_prog, plen, plen_reg(nfp_prog), ALU_OP_ADD, delta); 1695 /* delta == 0 is not allowed by the kernel, add must overflow to make 1696 * length smaller. 1697 */ 1698 emit_br(nfp_prog, BR_BCC, ret_einval, 0); 1699 1700 /* if (new_len < 14) then -EINVAL */ 1701 emit_alu(nfp_prog, reg_none(), plen, ALU_OP_SUB, reg_imm(ETH_HLEN)); 1702 emit_br(nfp_prog, BR_BMI, ret_einval, 0); 1703 1704 emit_alu(nfp_prog, plen_reg(nfp_prog), 1705 plen_reg(nfp_prog), ALU_OP_ADD, delta); 1706 emit_alu(nfp_prog, pv_len(nfp_prog), 1707 pv_len(nfp_prog), ALU_OP_ADD, delta); 1708 1709 emit_br(nfp_prog, BR_UNC, end, 2); 1710 wrp_immed(nfp_prog, reg_both(0), 0); 1711 wrp_immed(nfp_prog, reg_both(1), 0); 1712 1713 if (!nfp_prog_confirm_current_offset(nfp_prog, ret_einval)) 1714 return -EINVAL; 1715 1716 wrp_immed(nfp_prog, reg_both(0), -22); 1717 wrp_immed(nfp_prog, reg_both(1), ~0); 1718 1719 if (!nfp_prog_confirm_current_offset(nfp_prog, end)) 1720 return -EINVAL; 1721 1722 return 0; 1723 } 1724 1725 static int 1726 map_call_stack_common(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1727 { 1728 bool load_lm_ptr; 1729 u32 ret_tgt; 1730 s64 lm_off; 1731 1732 /* We only have to reload LM0 if the key is not at start of stack */ 1733 lm_off = nfp_prog->stack_frame_depth; 1734 lm_off += meta->arg2.reg.var_off.value + meta->arg2.reg.off; 1735 load_lm_ptr = meta->arg2.var_off || lm_off; 1736 1737 /* Set LM0 to start of key */ 1738 if (load_lm_ptr) 1739 emit_csr_wr(nfp_prog, reg_b(2 * 2), NFP_CSR_ACT_LM_ADDR0); 1740 if (meta->func_id == BPF_FUNC_map_update_elem) 1741 emit_csr_wr(nfp_prog, reg_b(3 * 2), NFP_CSR_ACT_LM_ADDR2); 1742 1743 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO + meta->func_id, 1744 2, RELO_BR_HELPER); 1745 ret_tgt = nfp_prog_current_offset(nfp_prog) + 2; 1746 1747 /* Load map ID into A0 */ 1748 wrp_mov(nfp_prog, reg_a(0), reg_a(2)); 1749 1750 /* Load the return address into B0 */ 1751 wrp_immed_relo(nfp_prog, reg_b(0), ret_tgt, RELO_IMMED_REL); 1752 1753 if (!nfp_prog_confirm_current_offset(nfp_prog, ret_tgt)) 1754 return -EINVAL; 1755 1756 /* Reset the LM0 pointer */ 1757 if (!load_lm_ptr) 1758 return 0; 1759 1760 emit_csr_wr(nfp_prog, stack_reg(nfp_prog), NFP_CSR_ACT_LM_ADDR0); 1761 wrp_nops(nfp_prog, 3); 1762 1763 return 0; 1764 } 1765 1766 static int 1767 nfp_get_prandom_u32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1768 { 1769 __emit_csr_rd(nfp_prog, NFP_CSR_PSEUDO_RND_NUM); 1770 /* CSR value is read in following immed[gpr, 0] */ 1771 emit_immed(nfp_prog, reg_both(0), 0, 1772 IMMED_WIDTH_ALL, false, IMMED_SHIFT_0B); 1773 emit_immed(nfp_prog, reg_both(1), 0, 1774 IMMED_WIDTH_ALL, false, IMMED_SHIFT_0B); 1775 return 0; 1776 } 1777 1778 static int 1779 nfp_perf_event_output(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1780 { 1781 swreg ptr_type; 1782 u32 ret_tgt; 1783 1784 ptr_type = ur_load_imm_any(nfp_prog, meta->arg1.type, imm_a(nfp_prog)); 1785 1786 ret_tgt = nfp_prog_current_offset(nfp_prog) + 3; 1787 1788 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO + meta->func_id, 1789 2, RELO_BR_HELPER); 1790 1791 /* Load ptr type into A1 */ 1792 wrp_mov(nfp_prog, reg_a(1), ptr_type); 1793 1794 /* Load the return address into B0 */ 1795 wrp_immed_relo(nfp_prog, reg_b(0), ret_tgt, RELO_IMMED_REL); 1796 1797 if (!nfp_prog_confirm_current_offset(nfp_prog, ret_tgt)) 1798 return -EINVAL; 1799 1800 return 0; 1801 } 1802 1803 static int 1804 nfp_queue_select(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1805 { 1806 u32 jmp_tgt; 1807 1808 jmp_tgt = nfp_prog_current_offset(nfp_prog) + 5; 1809 1810 /* Make sure the queue id fits into FW field */ 1811 emit_alu(nfp_prog, reg_none(), reg_a(meta->insn.src_reg * 2), 1812 ALU_OP_AND_NOT_B, reg_imm(0xff)); 1813 emit_br(nfp_prog, BR_BEQ, jmp_tgt, 2); 1814 1815 /* Set the 'queue selected' bit and the queue value */ 1816 emit_shf(nfp_prog, pv_qsel_set(nfp_prog), 1817 pv_qsel_set(nfp_prog), SHF_OP_OR, reg_imm(1), 1818 SHF_SC_L_SHF, PKT_VEL_QSEL_SET_BIT); 1819 emit_ld_field(nfp_prog, 1820 pv_qsel_val(nfp_prog), 0x1, reg_b(meta->insn.src_reg * 2), 1821 SHF_SC_NONE, 0); 1822 /* Delay slots end here, we will jump over next instruction if queue 1823 * value fits into the field. 1824 */ 1825 emit_ld_field(nfp_prog, 1826 pv_qsel_val(nfp_prog), 0x1, reg_imm(NFP_NET_RXR_MAX), 1827 SHF_SC_NONE, 0); 1828 1829 if (!nfp_prog_confirm_current_offset(nfp_prog, jmp_tgt)) 1830 return -EINVAL; 1831 1832 return 0; 1833 } 1834 1835 /* --- Callbacks --- */ 1836 static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1837 { 1838 const struct bpf_insn *insn = &meta->insn; 1839 u8 dst = insn->dst_reg * 2; 1840 u8 src = insn->src_reg * 2; 1841 1842 if (insn->src_reg == BPF_REG_10) { 1843 swreg stack_depth_reg; 1844 1845 stack_depth_reg = ur_load_imm_any(nfp_prog, 1846 nfp_prog->stack_frame_depth, 1847 stack_imm(nfp_prog)); 1848 emit_alu(nfp_prog, reg_both(dst), stack_reg(nfp_prog), 1849 ALU_OP_ADD, stack_depth_reg); 1850 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 1851 } else { 1852 wrp_reg_mov(nfp_prog, dst, src); 1853 wrp_reg_mov(nfp_prog, dst + 1, src + 1); 1854 } 1855 1856 return 0; 1857 } 1858 1859 static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1860 { 1861 u64 imm = meta->insn.imm; /* sign extend */ 1862 1863 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U); 1864 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32); 1865 1866 return 0; 1867 } 1868 1869 static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1870 { 1871 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR); 1872 } 1873 1874 static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1875 { 1876 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); 1877 } 1878 1879 static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1880 { 1881 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND); 1882 } 1883 1884 static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1885 { 1886 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); 1887 } 1888 1889 static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1890 { 1891 return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR); 1892 } 1893 1894 static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1895 { 1896 return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); 1897 } 1898 1899 static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1900 { 1901 const struct bpf_insn *insn = &meta->insn; 1902 1903 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 1904 reg_a(insn->dst_reg * 2), ALU_OP_ADD, 1905 reg_b(insn->src_reg * 2)); 1906 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 1907 reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C, 1908 reg_b(insn->src_reg * 2 + 1)); 1909 1910 return 0; 1911 } 1912 1913 static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1914 { 1915 const struct bpf_insn *insn = &meta->insn; 1916 u64 imm = insn->imm; /* sign extend */ 1917 1918 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U); 1919 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32); 1920 1921 return 0; 1922 } 1923 1924 static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1925 { 1926 const struct bpf_insn *insn = &meta->insn; 1927 1928 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), 1929 reg_a(insn->dst_reg * 2), ALU_OP_SUB, 1930 reg_b(insn->src_reg * 2)); 1931 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 1932 reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C, 1933 reg_b(insn->src_reg * 2 + 1)); 1934 1935 return 0; 1936 } 1937 1938 static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1939 { 1940 const struct bpf_insn *insn = &meta->insn; 1941 u64 imm = insn->imm; /* sign extend */ 1942 1943 wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U); 1944 wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32); 1945 1946 return 0; 1947 } 1948 1949 static int mul_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1950 { 1951 return wrp_mul(nfp_prog, meta, true, true); 1952 } 1953 1954 static int mul_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1955 { 1956 return wrp_mul(nfp_prog, meta, true, false); 1957 } 1958 1959 static int div_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1960 { 1961 const struct bpf_insn *insn = &meta->insn; 1962 1963 return wrp_div_imm(nfp_prog, insn->dst_reg * 2, insn->imm); 1964 } 1965 1966 static int div_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1967 { 1968 /* NOTE: verifier hook has rejected cases for which verifier doesn't 1969 * know whether the source operand is constant or not. 1970 */ 1971 return wrp_div_imm(nfp_prog, meta->insn.dst_reg * 2, meta->umin_src); 1972 } 1973 1974 static int neg_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 1975 { 1976 const struct bpf_insn *insn = &meta->insn; 1977 1978 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2), reg_imm(0), 1979 ALU_OP_SUB, reg_b(insn->dst_reg * 2)); 1980 emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1), reg_imm(0), 1981 ALU_OP_SUB_C, reg_b(insn->dst_reg * 2 + 1)); 1982 1983 return 0; 1984 } 1985 1986 /* Pseudo code: 1987 * if shift_amt >= 32 1988 * dst_high = dst_low << shift_amt[4:0] 1989 * dst_low = 0; 1990 * else 1991 * dst_high = (dst_high, dst_low) >> (32 - shift_amt) 1992 * dst_low = dst_low << shift_amt 1993 * 1994 * The indirect shift will use the same logic at runtime. 1995 */ 1996 static int __shl_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) 1997 { 1998 if (!shift_amt) 1999 return 0; 2000 2001 if (shift_amt < 32) { 2002 emit_shf(nfp_prog, reg_both(dst + 1), reg_a(dst + 1), 2003 SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, 2004 32 - shift_amt); 2005 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2006 reg_b(dst), SHF_SC_L_SHF, shift_amt); 2007 } else if (shift_amt == 32) { 2008 wrp_reg_mov(nfp_prog, dst + 1, dst); 2009 wrp_immed(nfp_prog, reg_both(dst), 0); 2010 } else if (shift_amt > 32) { 2011 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_NONE, 2012 reg_b(dst), SHF_SC_L_SHF, shift_amt - 32); 2013 wrp_immed(nfp_prog, reg_both(dst), 0); 2014 } 2015 2016 return 0; 2017 } 2018 2019 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2020 { 2021 const struct bpf_insn *insn = &meta->insn; 2022 u8 dst = insn->dst_reg * 2; 2023 2024 return __shl_imm64(nfp_prog, dst, insn->imm); 2025 } 2026 2027 static void shl_reg64_lt32_high(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2028 { 2029 emit_alu(nfp_prog, imm_both(nfp_prog), reg_imm(32), ALU_OP_SUB, 2030 reg_b(src)); 2031 emit_alu(nfp_prog, reg_none(), imm_a(nfp_prog), ALU_OP_OR, reg_imm(0)); 2032 emit_shf_indir(nfp_prog, reg_both(dst + 1), reg_a(dst + 1), SHF_OP_NONE, 2033 reg_b(dst), SHF_SC_R_DSHF); 2034 } 2035 2036 /* NOTE: for indirect left shift, HIGH part should be calculated first. */ 2037 static void shl_reg64_lt32_low(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2038 { 2039 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2040 emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2041 reg_b(dst), SHF_SC_L_SHF); 2042 } 2043 2044 static void shl_reg64_lt32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2045 { 2046 shl_reg64_lt32_high(nfp_prog, dst, src); 2047 shl_reg64_lt32_low(nfp_prog, dst, src); 2048 } 2049 2050 static void shl_reg64_ge32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2051 { 2052 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2053 emit_shf_indir(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_NONE, 2054 reg_b(dst), SHF_SC_L_SHF); 2055 wrp_immed(nfp_prog, reg_both(dst), 0); 2056 } 2057 2058 static int shl_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2059 { 2060 const struct bpf_insn *insn = &meta->insn; 2061 u64 umin, umax; 2062 u8 dst, src; 2063 2064 dst = insn->dst_reg * 2; 2065 umin = meta->umin_src; 2066 umax = meta->umax_src; 2067 if (umin == umax) 2068 return __shl_imm64(nfp_prog, dst, umin); 2069 2070 src = insn->src_reg * 2; 2071 if (umax < 32) { 2072 shl_reg64_lt32(nfp_prog, dst, src); 2073 } else if (umin >= 32) { 2074 shl_reg64_ge32(nfp_prog, dst, src); 2075 } else { 2076 /* Generate different instruction sequences depending on runtime 2077 * value of shift amount. 2078 */ 2079 u16 label_ge32, label_end; 2080 2081 label_ge32 = nfp_prog_current_offset(nfp_prog) + 7; 2082 emit_br_bset(nfp_prog, reg_a(src), 5, label_ge32, 0); 2083 2084 shl_reg64_lt32_high(nfp_prog, dst, src); 2085 label_end = nfp_prog_current_offset(nfp_prog) + 6; 2086 emit_br(nfp_prog, BR_UNC, label_end, 2); 2087 /* shl_reg64_lt32_low packed in delay slot. */ 2088 shl_reg64_lt32_low(nfp_prog, dst, src); 2089 2090 if (!nfp_prog_confirm_current_offset(nfp_prog, label_ge32)) 2091 return -EINVAL; 2092 shl_reg64_ge32(nfp_prog, dst, src); 2093 2094 if (!nfp_prog_confirm_current_offset(nfp_prog, label_end)) 2095 return -EINVAL; 2096 } 2097 2098 return 0; 2099 } 2100 2101 /* Pseudo code: 2102 * if shift_amt >= 32 2103 * dst_high = 0; 2104 * dst_low = dst_high >> shift_amt[4:0] 2105 * else 2106 * dst_high = dst_high >> shift_amt 2107 * dst_low = (dst_high, dst_low) >> shift_amt 2108 * 2109 * The indirect shift will use the same logic at runtime. 2110 */ 2111 static int __shr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) 2112 { 2113 if (!shift_amt) 2114 return 0; 2115 2116 if (shift_amt < 32) { 2117 emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, 2118 reg_b(dst), SHF_SC_R_DSHF, shift_amt); 2119 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_NONE, 2120 reg_b(dst + 1), SHF_SC_R_SHF, shift_amt); 2121 } else if (shift_amt == 32) { 2122 wrp_reg_mov(nfp_prog, dst, dst + 1); 2123 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 2124 } else if (shift_amt > 32) { 2125 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2126 reg_b(dst + 1), SHF_SC_R_SHF, shift_amt - 32); 2127 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 2128 } 2129 2130 return 0; 2131 } 2132 2133 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2134 { 2135 const struct bpf_insn *insn = &meta->insn; 2136 u8 dst = insn->dst_reg * 2; 2137 2138 return __shr_imm64(nfp_prog, dst, insn->imm); 2139 } 2140 2141 /* NOTE: for indirect right shift, LOW part should be calculated first. */ 2142 static void shr_reg64_lt32_high(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2143 { 2144 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2145 emit_shf_indir(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_NONE, 2146 reg_b(dst + 1), SHF_SC_R_SHF); 2147 } 2148 2149 static void shr_reg64_lt32_low(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2150 { 2151 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2152 emit_shf_indir(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, 2153 reg_b(dst), SHF_SC_R_DSHF); 2154 } 2155 2156 static void shr_reg64_lt32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2157 { 2158 shr_reg64_lt32_low(nfp_prog, dst, src); 2159 shr_reg64_lt32_high(nfp_prog, dst, src); 2160 } 2161 2162 static void shr_reg64_ge32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2163 { 2164 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2165 emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2166 reg_b(dst + 1), SHF_SC_R_SHF); 2167 wrp_immed(nfp_prog, reg_both(dst + 1), 0); 2168 } 2169 2170 static int shr_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2171 { 2172 const struct bpf_insn *insn = &meta->insn; 2173 u64 umin, umax; 2174 u8 dst, src; 2175 2176 dst = insn->dst_reg * 2; 2177 umin = meta->umin_src; 2178 umax = meta->umax_src; 2179 if (umin == umax) 2180 return __shr_imm64(nfp_prog, dst, umin); 2181 2182 src = insn->src_reg * 2; 2183 if (umax < 32) { 2184 shr_reg64_lt32(nfp_prog, dst, src); 2185 } else if (umin >= 32) { 2186 shr_reg64_ge32(nfp_prog, dst, src); 2187 } else { 2188 /* Generate different instruction sequences depending on runtime 2189 * value of shift amount. 2190 */ 2191 u16 label_ge32, label_end; 2192 2193 label_ge32 = nfp_prog_current_offset(nfp_prog) + 6; 2194 emit_br_bset(nfp_prog, reg_a(src), 5, label_ge32, 0); 2195 shr_reg64_lt32_low(nfp_prog, dst, src); 2196 label_end = nfp_prog_current_offset(nfp_prog) + 6; 2197 emit_br(nfp_prog, BR_UNC, label_end, 2); 2198 /* shr_reg64_lt32_high packed in delay slot. */ 2199 shr_reg64_lt32_high(nfp_prog, dst, src); 2200 2201 if (!nfp_prog_confirm_current_offset(nfp_prog, label_ge32)) 2202 return -EINVAL; 2203 shr_reg64_ge32(nfp_prog, dst, src); 2204 2205 if (!nfp_prog_confirm_current_offset(nfp_prog, label_end)) 2206 return -EINVAL; 2207 } 2208 2209 return 0; 2210 } 2211 2212 /* Code logic is the same as __shr_imm64 except ashr requires signedness bit 2213 * told through PREV_ALU result. 2214 */ 2215 static int __ashr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) 2216 { 2217 if (!shift_amt) 2218 return 0; 2219 2220 if (shift_amt < 32) { 2221 emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, 2222 reg_b(dst), SHF_SC_R_DSHF, shift_amt); 2223 /* Set signedness bit. */ 2224 emit_alu(nfp_prog, reg_none(), reg_a(dst + 1), ALU_OP_OR, 2225 reg_imm(0)); 2226 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_ASHR, 2227 reg_b(dst + 1), SHF_SC_R_SHF, shift_amt); 2228 } else if (shift_amt == 32) { 2229 /* NOTE: this also helps setting signedness bit. */ 2230 wrp_reg_mov(nfp_prog, dst, dst + 1); 2231 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_ASHR, 2232 reg_b(dst + 1), SHF_SC_R_SHF, 31); 2233 } else if (shift_amt > 32) { 2234 emit_alu(nfp_prog, reg_none(), reg_a(dst + 1), ALU_OP_OR, 2235 reg_imm(0)); 2236 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, 2237 reg_b(dst + 1), SHF_SC_R_SHF, shift_amt - 32); 2238 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_ASHR, 2239 reg_b(dst + 1), SHF_SC_R_SHF, 31); 2240 } 2241 2242 return 0; 2243 } 2244 2245 static int ashr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2246 { 2247 const struct bpf_insn *insn = &meta->insn; 2248 u8 dst = insn->dst_reg * 2; 2249 2250 return __ashr_imm64(nfp_prog, dst, insn->imm); 2251 } 2252 2253 static void ashr_reg64_lt32_high(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2254 { 2255 /* NOTE: the first insn will set both indirect shift amount (source A) 2256 * and signedness bit (MSB of result). 2257 */ 2258 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_b(dst + 1)); 2259 emit_shf_indir(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_ASHR, 2260 reg_b(dst + 1), SHF_SC_R_SHF); 2261 } 2262 2263 static void ashr_reg64_lt32_low(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2264 { 2265 /* NOTE: it is the same as logic shift because we don't need to shift in 2266 * signedness bit when the shift amount is less than 32. 2267 */ 2268 return shr_reg64_lt32_low(nfp_prog, dst, src); 2269 } 2270 2271 static void ashr_reg64_lt32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2272 { 2273 ashr_reg64_lt32_low(nfp_prog, dst, src); 2274 ashr_reg64_lt32_high(nfp_prog, dst, src); 2275 } 2276 2277 static void ashr_reg64_ge32(struct nfp_prog *nfp_prog, u8 dst, u8 src) 2278 { 2279 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_b(dst + 1)); 2280 emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, 2281 reg_b(dst + 1), SHF_SC_R_SHF); 2282 emit_shf(nfp_prog, reg_both(dst + 1), reg_none(), SHF_OP_ASHR, 2283 reg_b(dst + 1), SHF_SC_R_SHF, 31); 2284 } 2285 2286 /* Like ashr_imm64, but need to use indirect shift. */ 2287 static int ashr_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2288 { 2289 const struct bpf_insn *insn = &meta->insn; 2290 u64 umin, umax; 2291 u8 dst, src; 2292 2293 dst = insn->dst_reg * 2; 2294 umin = meta->umin_src; 2295 umax = meta->umax_src; 2296 if (umin == umax) 2297 return __ashr_imm64(nfp_prog, dst, umin); 2298 2299 src = insn->src_reg * 2; 2300 if (umax < 32) { 2301 ashr_reg64_lt32(nfp_prog, dst, src); 2302 } else if (umin >= 32) { 2303 ashr_reg64_ge32(nfp_prog, dst, src); 2304 } else { 2305 u16 label_ge32, label_end; 2306 2307 label_ge32 = nfp_prog_current_offset(nfp_prog) + 6; 2308 emit_br_bset(nfp_prog, reg_a(src), 5, label_ge32, 0); 2309 ashr_reg64_lt32_low(nfp_prog, dst, src); 2310 label_end = nfp_prog_current_offset(nfp_prog) + 6; 2311 emit_br(nfp_prog, BR_UNC, label_end, 2); 2312 /* ashr_reg64_lt32_high packed in delay slot. */ 2313 ashr_reg64_lt32_high(nfp_prog, dst, src); 2314 2315 if (!nfp_prog_confirm_current_offset(nfp_prog, label_ge32)) 2316 return -EINVAL; 2317 ashr_reg64_ge32(nfp_prog, dst, src); 2318 2319 if (!nfp_prog_confirm_current_offset(nfp_prog, label_end)) 2320 return -EINVAL; 2321 } 2322 2323 return 0; 2324 } 2325 2326 static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2327 { 2328 const struct bpf_insn *insn = &meta->insn; 2329 2330 wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2); 2331 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 2332 2333 return 0; 2334 } 2335 2336 static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2337 { 2338 const struct bpf_insn *insn = &meta->insn; 2339 2340 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm); 2341 wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); 2342 2343 return 0; 2344 } 2345 2346 static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2347 { 2348 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR); 2349 } 2350 2351 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2352 { 2353 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR); 2354 } 2355 2356 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2357 { 2358 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND); 2359 } 2360 2361 static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2362 { 2363 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND); 2364 } 2365 2366 static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2367 { 2368 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR); 2369 } 2370 2371 static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2372 { 2373 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR); 2374 } 2375 2376 static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2377 { 2378 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD); 2379 } 2380 2381 static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2382 { 2383 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD); 2384 } 2385 2386 static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2387 { 2388 return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB); 2389 } 2390 2391 static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2392 { 2393 return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB); 2394 } 2395 2396 static int mul_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2397 { 2398 return wrp_mul(nfp_prog, meta, false, true); 2399 } 2400 2401 static int mul_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2402 { 2403 return wrp_mul(nfp_prog, meta, false, false); 2404 } 2405 2406 static int div_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2407 { 2408 return div_reg64(nfp_prog, meta); 2409 } 2410 2411 static int div_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2412 { 2413 return div_imm64(nfp_prog, meta); 2414 } 2415 2416 static int neg_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2417 { 2418 u8 dst = meta->insn.dst_reg * 2; 2419 2420 emit_alu(nfp_prog, reg_both(dst), reg_imm(0), ALU_OP_SUB, reg_b(dst)); 2421 wrp_zext(nfp_prog, meta, dst); 2422 2423 return 0; 2424 } 2425 2426 static int 2427 __ashr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, u8 dst, 2428 u8 shift_amt) 2429 { 2430 if (shift_amt) { 2431 /* Set signedness bit (MSB of result). */ 2432 emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR, 2433 reg_imm(0)); 2434 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, 2435 reg_b(dst), SHF_SC_R_SHF, shift_amt); 2436 } 2437 wrp_zext(nfp_prog, meta, dst); 2438 2439 return 0; 2440 } 2441 2442 static int ashr_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2443 { 2444 const struct bpf_insn *insn = &meta->insn; 2445 u64 umin, umax; 2446 u8 dst, src; 2447 2448 dst = insn->dst_reg * 2; 2449 umin = meta->umin_src; 2450 umax = meta->umax_src; 2451 if (umin == umax) 2452 return __ashr_imm(nfp_prog, meta, dst, umin); 2453 2454 src = insn->src_reg * 2; 2455 /* NOTE: the first insn will set both indirect shift amount (source A) 2456 * and signedness bit (MSB of result). 2457 */ 2458 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_b(dst)); 2459 emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, 2460 reg_b(dst), SHF_SC_R_SHF); 2461 wrp_zext(nfp_prog, meta, dst); 2462 2463 return 0; 2464 } 2465 2466 static int ashr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2467 { 2468 const struct bpf_insn *insn = &meta->insn; 2469 u8 dst = insn->dst_reg * 2; 2470 2471 return __ashr_imm(nfp_prog, meta, dst, insn->imm); 2472 } 2473 2474 static int 2475 __shr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, u8 dst, 2476 u8 shift_amt) 2477 { 2478 if (shift_amt) 2479 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2480 reg_b(dst), SHF_SC_R_SHF, shift_amt); 2481 wrp_zext(nfp_prog, meta, dst); 2482 return 0; 2483 } 2484 2485 static int shr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2486 { 2487 const struct bpf_insn *insn = &meta->insn; 2488 u8 dst = insn->dst_reg * 2; 2489 2490 return __shr_imm(nfp_prog, meta, dst, insn->imm); 2491 } 2492 2493 static int shr_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2494 { 2495 const struct bpf_insn *insn = &meta->insn; 2496 u64 umin, umax; 2497 u8 dst, src; 2498 2499 dst = insn->dst_reg * 2; 2500 umin = meta->umin_src; 2501 umax = meta->umax_src; 2502 if (umin == umax) 2503 return __shr_imm(nfp_prog, meta, dst, umin); 2504 2505 src = insn->src_reg * 2; 2506 emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0)); 2507 emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2508 reg_b(dst), SHF_SC_R_SHF); 2509 wrp_zext(nfp_prog, meta, dst); 2510 return 0; 2511 } 2512 2513 static int 2514 __shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, u8 dst, 2515 u8 shift_amt) 2516 { 2517 if (shift_amt) 2518 emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE, 2519 reg_b(dst), SHF_SC_L_SHF, shift_amt); 2520 wrp_zext(nfp_prog, meta, dst); 2521 return 0; 2522 } 2523 2524 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2525 { 2526 const struct bpf_insn *insn = &meta->insn; 2527 u8 dst = insn->dst_reg * 2; 2528 2529 return __shl_imm(nfp_prog, meta, dst, insn->imm); 2530 } 2531 2532 static int shl_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2533 { 2534 const struct bpf_insn *insn = &meta->insn; 2535 u64 umin, umax; 2536 u8 dst, src; 2537 2538 dst = insn->dst_reg * 2; 2539 umin = meta->umin_src; 2540 umax = meta->umax_src; 2541 if (umin == umax) 2542 return __shl_imm(nfp_prog, meta, dst, umin); 2543 2544 src = insn->src_reg * 2; 2545 shl_reg64_lt32_low(nfp_prog, dst, src); 2546 wrp_zext(nfp_prog, meta, dst); 2547 return 0; 2548 } 2549 2550 static int end_reg32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2551 { 2552 const struct bpf_insn *insn = &meta->insn; 2553 u8 gpr = insn->dst_reg * 2; 2554 2555 switch (insn->imm) { 2556 case 16: 2557 emit_ld_field(nfp_prog, reg_both(gpr), 0x9, reg_b(gpr), 2558 SHF_SC_R_ROT, 8); 2559 emit_ld_field(nfp_prog, reg_both(gpr), 0xe, reg_a(gpr), 2560 SHF_SC_R_SHF, 16); 2561 2562 wrp_immed(nfp_prog, reg_both(gpr + 1), 0); 2563 break; 2564 case 32: 2565 wrp_end32(nfp_prog, reg_a(gpr), gpr); 2566 wrp_immed(nfp_prog, reg_both(gpr + 1), 0); 2567 break; 2568 case 64: 2569 wrp_mov(nfp_prog, imm_a(nfp_prog), reg_b(gpr + 1)); 2570 2571 wrp_end32(nfp_prog, reg_a(gpr), gpr + 1); 2572 wrp_end32(nfp_prog, imm_a(nfp_prog), gpr); 2573 break; 2574 } 2575 2576 return 0; 2577 } 2578 2579 static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2580 { 2581 struct nfp_insn_meta *prev = nfp_meta_prev(meta); 2582 u32 imm_lo, imm_hi; 2583 u8 dst; 2584 2585 dst = prev->insn.dst_reg * 2; 2586 imm_lo = prev->insn.imm; 2587 imm_hi = meta->insn.imm; 2588 2589 wrp_immed(nfp_prog, reg_both(dst), imm_lo); 2590 2591 /* mov is always 1 insn, load imm may be two, so try to use mov */ 2592 if (imm_hi == imm_lo) 2593 wrp_mov(nfp_prog, reg_both(dst + 1), reg_a(dst)); 2594 else 2595 wrp_immed(nfp_prog, reg_both(dst + 1), imm_hi); 2596 2597 return 0; 2598 } 2599 2600 static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2601 { 2602 meta->double_cb = imm_ld8_part2; 2603 return 0; 2604 } 2605 2606 static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2607 { 2608 return construct_data_ld(nfp_prog, meta, meta->insn.imm, 1); 2609 } 2610 2611 static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2612 { 2613 return construct_data_ld(nfp_prog, meta, meta->insn.imm, 2); 2614 } 2615 2616 static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2617 { 2618 return construct_data_ld(nfp_prog, meta, meta->insn.imm, 4); 2619 } 2620 2621 static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2622 { 2623 return construct_data_ind_ld(nfp_prog, meta, meta->insn.imm, 2624 meta->insn.src_reg * 2, 1); 2625 } 2626 2627 static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2628 { 2629 return construct_data_ind_ld(nfp_prog, meta, meta->insn.imm, 2630 meta->insn.src_reg * 2, 2); 2631 } 2632 2633 static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2634 { 2635 return construct_data_ind_ld(nfp_prog, meta, meta->insn.imm, 2636 meta->insn.src_reg * 2, 4); 2637 } 2638 2639 static int 2640 mem_ldx_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2641 unsigned int size, unsigned int ptr_off) 2642 { 2643 return mem_op_stack(nfp_prog, meta, size, ptr_off, 2644 meta->insn.dst_reg * 2, meta->insn.src_reg * 2, 2645 true, wrp_lmem_load); 2646 } 2647 2648 static int mem_ldx_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2649 u8 size) 2650 { 2651 swreg dst = reg_both(meta->insn.dst_reg * 2); 2652 2653 switch (meta->insn.off) { 2654 case offsetof(struct __sk_buff, len): 2655 if (size != sizeof_field(struct __sk_buff, len)) 2656 return -EOPNOTSUPP; 2657 wrp_mov(nfp_prog, dst, plen_reg(nfp_prog)); 2658 break; 2659 case offsetof(struct __sk_buff, data): 2660 if (size != sizeof_field(struct __sk_buff, data)) 2661 return -EOPNOTSUPP; 2662 wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog)); 2663 break; 2664 case offsetof(struct __sk_buff, data_end): 2665 if (size != sizeof_field(struct __sk_buff, data_end)) 2666 return -EOPNOTSUPP; 2667 emit_alu(nfp_prog, dst, 2668 plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog)); 2669 break; 2670 default: 2671 return -EOPNOTSUPP; 2672 } 2673 2674 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 2675 2676 return 0; 2677 } 2678 2679 static int mem_ldx_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2680 u8 size) 2681 { 2682 swreg dst = reg_both(meta->insn.dst_reg * 2); 2683 2684 switch (meta->insn.off) { 2685 case offsetof(struct xdp_md, data): 2686 if (size != sizeof_field(struct xdp_md, data)) 2687 return -EOPNOTSUPP; 2688 wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog)); 2689 break; 2690 case offsetof(struct xdp_md, data_end): 2691 if (size != sizeof_field(struct xdp_md, data_end)) 2692 return -EOPNOTSUPP; 2693 emit_alu(nfp_prog, dst, 2694 plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog)); 2695 break; 2696 default: 2697 return -EOPNOTSUPP; 2698 } 2699 2700 wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0); 2701 2702 return 0; 2703 } 2704 2705 static int 2706 mem_ldx_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2707 unsigned int size) 2708 { 2709 swreg tmp_reg; 2710 2711 tmp_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 2712 2713 return data_ld_host_order_addr32(nfp_prog, meta, meta->insn.src_reg * 2, 2714 tmp_reg, meta->insn.dst_reg * 2, size); 2715 } 2716 2717 static int 2718 mem_ldx_emem(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2719 unsigned int size) 2720 { 2721 swreg tmp_reg; 2722 2723 tmp_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 2724 2725 return data_ld_host_order_addr40(nfp_prog, meta, meta->insn.src_reg * 2, 2726 tmp_reg, meta->insn.dst_reg * 2, size); 2727 } 2728 2729 static void 2730 mem_ldx_data_init_pktcache(struct nfp_prog *nfp_prog, 2731 struct nfp_insn_meta *meta) 2732 { 2733 s16 range_start = meta->pkt_cache.range_start; 2734 s16 range_end = meta->pkt_cache.range_end; 2735 swreg src_base, off; 2736 u8 xfer_num, len; 2737 bool indir; 2738 2739 off = re_load_imm_any(nfp_prog, range_start, imm_b(nfp_prog)); 2740 src_base = reg_a(meta->insn.src_reg * 2); 2741 len = range_end - range_start; 2742 xfer_num = round_up(len, REG_WIDTH) / REG_WIDTH; 2743 2744 indir = len > 8 * REG_WIDTH; 2745 /* Setup PREV_ALU for indirect mode. */ 2746 if (indir) 2747 wrp_immed(nfp_prog, reg_none(), 2748 CMD_OVE_LEN | FIELD_PREP(CMD_OV_LEN, xfer_num - 1)); 2749 2750 /* Cache memory into transfer-in registers. */ 2751 emit_cmd_any(nfp_prog, CMD_TGT_READ32_SWAP, CMD_MODE_32b, 0, src_base, 2752 off, xfer_num - 1, CMD_CTX_SWAP, indir); 2753 } 2754 2755 static int 2756 mem_ldx_data_from_pktcache_unaligned(struct nfp_prog *nfp_prog, 2757 struct nfp_insn_meta *meta, 2758 unsigned int size) 2759 { 2760 s16 range_start = meta->pkt_cache.range_start; 2761 s16 insn_off = meta->insn.off - range_start; 2762 swreg dst_lo, dst_hi, src_lo, src_mid; 2763 u8 dst_gpr = meta->insn.dst_reg * 2; 2764 u8 len_lo = size, len_mid = 0; 2765 u8 idx = insn_off / REG_WIDTH; 2766 u8 off = insn_off % REG_WIDTH; 2767 2768 dst_hi = reg_both(dst_gpr + 1); 2769 dst_lo = reg_both(dst_gpr); 2770 src_lo = reg_xfer(idx); 2771 2772 /* The read length could involve as many as three registers. */ 2773 if (size > REG_WIDTH - off) { 2774 /* Calculate the part in the second register. */ 2775 len_lo = REG_WIDTH - off; 2776 len_mid = size - len_lo; 2777 2778 /* Calculate the part in the third register. */ 2779 if (size > 2 * REG_WIDTH - off) 2780 len_mid = REG_WIDTH; 2781 } 2782 2783 wrp_reg_subpart(nfp_prog, dst_lo, src_lo, len_lo, off); 2784 2785 if (!len_mid) { 2786 wrp_zext(nfp_prog, meta, dst_gpr); 2787 return 0; 2788 } 2789 2790 src_mid = reg_xfer(idx + 1); 2791 2792 if (size <= REG_WIDTH) { 2793 wrp_reg_or_subpart(nfp_prog, dst_lo, src_mid, len_mid, len_lo); 2794 wrp_zext(nfp_prog, meta, dst_gpr); 2795 } else { 2796 swreg src_hi = reg_xfer(idx + 2); 2797 2798 wrp_reg_or_subpart(nfp_prog, dst_lo, src_mid, 2799 REG_WIDTH - len_lo, len_lo); 2800 wrp_reg_subpart(nfp_prog, dst_hi, src_mid, len_lo, 2801 REG_WIDTH - len_lo); 2802 wrp_reg_or_subpart(nfp_prog, dst_hi, src_hi, REG_WIDTH - len_lo, 2803 len_lo); 2804 } 2805 2806 return 0; 2807 } 2808 2809 static int 2810 mem_ldx_data_from_pktcache_aligned(struct nfp_prog *nfp_prog, 2811 struct nfp_insn_meta *meta, 2812 unsigned int size) 2813 { 2814 swreg dst_lo, dst_hi, src_lo; 2815 u8 dst_gpr, idx; 2816 2817 idx = (meta->insn.off - meta->pkt_cache.range_start) / REG_WIDTH; 2818 dst_gpr = meta->insn.dst_reg * 2; 2819 dst_hi = reg_both(dst_gpr + 1); 2820 dst_lo = reg_both(dst_gpr); 2821 src_lo = reg_xfer(idx); 2822 2823 if (size < REG_WIDTH) { 2824 wrp_reg_subpart(nfp_prog, dst_lo, src_lo, size, 0); 2825 wrp_zext(nfp_prog, meta, dst_gpr); 2826 } else if (size == REG_WIDTH) { 2827 wrp_mov(nfp_prog, dst_lo, src_lo); 2828 wrp_zext(nfp_prog, meta, dst_gpr); 2829 } else { 2830 swreg src_hi = reg_xfer(idx + 1); 2831 2832 wrp_mov(nfp_prog, dst_lo, src_lo); 2833 wrp_mov(nfp_prog, dst_hi, src_hi); 2834 } 2835 2836 return 0; 2837 } 2838 2839 static int 2840 mem_ldx_data_from_pktcache(struct nfp_prog *nfp_prog, 2841 struct nfp_insn_meta *meta, unsigned int size) 2842 { 2843 u8 off = meta->insn.off - meta->pkt_cache.range_start; 2844 2845 if (IS_ALIGNED(off, REG_WIDTH)) 2846 return mem_ldx_data_from_pktcache_aligned(nfp_prog, meta, size); 2847 2848 return mem_ldx_data_from_pktcache_unaligned(nfp_prog, meta, size); 2849 } 2850 2851 static int 2852 mem_ldx(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2853 unsigned int size) 2854 { 2855 if (meta->ldst_gather_len) 2856 return nfp_cpp_memcpy(nfp_prog, meta); 2857 2858 if (meta->ptr.type == PTR_TO_CTX) { 2859 if (nfp_prog->type == BPF_PROG_TYPE_XDP) 2860 return mem_ldx_xdp(nfp_prog, meta, size); 2861 else 2862 return mem_ldx_skb(nfp_prog, meta, size); 2863 } 2864 2865 if (meta->ptr.type == PTR_TO_PACKET) { 2866 if (meta->pkt_cache.range_end) { 2867 if (meta->pkt_cache.do_init) 2868 mem_ldx_data_init_pktcache(nfp_prog, meta); 2869 2870 return mem_ldx_data_from_pktcache(nfp_prog, meta, size); 2871 } else { 2872 return mem_ldx_data(nfp_prog, meta, size); 2873 } 2874 } 2875 2876 if (meta->ptr.type == PTR_TO_STACK) 2877 return mem_ldx_stack(nfp_prog, meta, size, 2878 meta->ptr.off + meta->ptr.var_off.value); 2879 2880 if (meta->ptr.type == PTR_TO_MAP_VALUE) 2881 return mem_ldx_emem(nfp_prog, meta, size); 2882 2883 return -EOPNOTSUPP; 2884 } 2885 2886 static int mem_ldx1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2887 { 2888 return mem_ldx(nfp_prog, meta, 1); 2889 } 2890 2891 static int mem_ldx2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2892 { 2893 return mem_ldx(nfp_prog, meta, 2); 2894 } 2895 2896 static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2897 { 2898 return mem_ldx(nfp_prog, meta, 4); 2899 } 2900 2901 static int mem_ldx8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2902 { 2903 return mem_ldx(nfp_prog, meta, 8); 2904 } 2905 2906 static int 2907 mem_st_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2908 unsigned int size) 2909 { 2910 u64 imm = meta->insn.imm; /* sign extend */ 2911 swreg off_reg; 2912 2913 off_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 2914 2915 return data_st_host_order(nfp_prog, meta->insn.dst_reg * 2, off_reg, 2916 imm, size); 2917 } 2918 2919 static int mem_st(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2920 unsigned int size) 2921 { 2922 if (meta->ptr.type == PTR_TO_PACKET) 2923 return mem_st_data(nfp_prog, meta, size); 2924 2925 return -EOPNOTSUPP; 2926 } 2927 2928 static int mem_st1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2929 { 2930 return mem_st(nfp_prog, meta, 1); 2931 } 2932 2933 static int mem_st2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2934 { 2935 return mem_st(nfp_prog, meta, 2); 2936 } 2937 2938 static int mem_st4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2939 { 2940 return mem_st(nfp_prog, meta, 4); 2941 } 2942 2943 static int mem_st8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2944 { 2945 return mem_st(nfp_prog, meta, 8); 2946 } 2947 2948 static int 2949 mem_stx_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2950 unsigned int size) 2951 { 2952 swreg off_reg; 2953 2954 off_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 2955 2956 return data_stx_host_order(nfp_prog, meta->insn.dst_reg * 2, off_reg, 2957 meta->insn.src_reg * 2, size); 2958 } 2959 2960 static int 2961 mem_stx_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2962 unsigned int size, unsigned int ptr_off) 2963 { 2964 return mem_op_stack(nfp_prog, meta, size, ptr_off, 2965 meta->insn.src_reg * 2, meta->insn.dst_reg * 2, 2966 false, wrp_lmem_store); 2967 } 2968 2969 static int mem_stx_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2970 { 2971 switch (meta->insn.off) { 2972 case offsetof(struct xdp_md, rx_queue_index): 2973 return nfp_queue_select(nfp_prog, meta); 2974 } 2975 2976 WARN_ON_ONCE(1); /* verifier should have rejected bad accesses */ 2977 return -EOPNOTSUPP; 2978 } 2979 2980 static int 2981 mem_stx(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 2982 unsigned int size) 2983 { 2984 if (meta->ptr.type == PTR_TO_PACKET) 2985 return mem_stx_data(nfp_prog, meta, size); 2986 2987 if (meta->ptr.type == PTR_TO_STACK) 2988 return mem_stx_stack(nfp_prog, meta, size, 2989 meta->ptr.off + meta->ptr.var_off.value); 2990 2991 return -EOPNOTSUPP; 2992 } 2993 2994 static int mem_stx1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 2995 { 2996 return mem_stx(nfp_prog, meta, 1); 2997 } 2998 2999 static int mem_stx2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3000 { 3001 return mem_stx(nfp_prog, meta, 2); 3002 } 3003 3004 static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3005 { 3006 if (meta->ptr.type == PTR_TO_CTX) 3007 if (nfp_prog->type == BPF_PROG_TYPE_XDP) 3008 return mem_stx_xdp(nfp_prog, meta); 3009 return mem_stx(nfp_prog, meta, 4); 3010 } 3011 3012 static int mem_stx8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3013 { 3014 return mem_stx(nfp_prog, meta, 8); 3015 } 3016 3017 static int 3018 mem_xadd(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, bool is64) 3019 { 3020 u8 dst_gpr = meta->insn.dst_reg * 2; 3021 u8 src_gpr = meta->insn.src_reg * 2; 3022 unsigned int full_add, out; 3023 swreg addra, addrb, off; 3024 3025 off = ur_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog)); 3026 3027 /* We can fit 16 bits into command immediate, if we know the immediate 3028 * is guaranteed to either always or never fit into 16 bit we only 3029 * generate code to handle that particular case, otherwise generate 3030 * code for both. 3031 */ 3032 out = nfp_prog_current_offset(nfp_prog); 3033 full_add = nfp_prog_current_offset(nfp_prog); 3034 3035 if (meta->insn.off) { 3036 out += 2; 3037 full_add += 2; 3038 } 3039 if (meta->xadd_maybe_16bit) { 3040 out += 3; 3041 full_add += 3; 3042 } 3043 if (meta->xadd_over_16bit) 3044 out += 2 + is64; 3045 if (meta->xadd_maybe_16bit && meta->xadd_over_16bit) { 3046 out += 5; 3047 full_add += 5; 3048 } 3049 3050 /* Generate the branch for choosing add_imm vs add */ 3051 if (meta->xadd_maybe_16bit && meta->xadd_over_16bit) { 3052 swreg max_imm = imm_a(nfp_prog); 3053 3054 wrp_immed(nfp_prog, max_imm, 0xffff); 3055 emit_alu(nfp_prog, reg_none(), 3056 max_imm, ALU_OP_SUB, reg_b(src_gpr)); 3057 emit_alu(nfp_prog, reg_none(), 3058 reg_imm(0), ALU_OP_SUB_C, reg_b(src_gpr + 1)); 3059 emit_br(nfp_prog, BR_BLO, full_add, meta->insn.off ? 2 : 0); 3060 /* defer for add */ 3061 } 3062 3063 /* If insn has an offset add to the address */ 3064 if (!meta->insn.off) { 3065 addra = reg_a(dst_gpr); 3066 addrb = reg_b(dst_gpr + 1); 3067 } else { 3068 emit_alu(nfp_prog, imma_a(nfp_prog), 3069 reg_a(dst_gpr), ALU_OP_ADD, off); 3070 emit_alu(nfp_prog, imma_b(nfp_prog), 3071 reg_a(dst_gpr + 1), ALU_OP_ADD_C, reg_imm(0)); 3072 addra = imma_a(nfp_prog); 3073 addrb = imma_b(nfp_prog); 3074 } 3075 3076 /* Generate the add_imm if 16 bits are possible */ 3077 if (meta->xadd_maybe_16bit) { 3078 swreg prev_alu = imm_a(nfp_prog); 3079 3080 wrp_immed(nfp_prog, prev_alu, 3081 FIELD_PREP(CMD_OVE_DATA, 2) | 3082 CMD_OVE_LEN | 3083 FIELD_PREP(CMD_OV_LEN, 0x8 | is64 << 2)); 3084 wrp_reg_or_subpart(nfp_prog, prev_alu, reg_b(src_gpr), 2, 2); 3085 emit_cmd_indir(nfp_prog, CMD_TGT_ADD_IMM, CMD_MODE_40b_BA, 0, 3086 addra, addrb, 0, CMD_CTX_NO_SWAP); 3087 3088 if (meta->xadd_over_16bit) 3089 emit_br(nfp_prog, BR_UNC, out, 0); 3090 } 3091 3092 if (!nfp_prog_confirm_current_offset(nfp_prog, full_add)) 3093 return -EINVAL; 3094 3095 /* Generate the add if 16 bits are not guaranteed */ 3096 if (meta->xadd_over_16bit) { 3097 emit_cmd(nfp_prog, CMD_TGT_ADD, CMD_MODE_40b_BA, 0, 3098 addra, addrb, is64 << 2, 3099 is64 ? CMD_CTX_SWAP_DEFER2 : CMD_CTX_SWAP_DEFER1); 3100 3101 wrp_mov(nfp_prog, reg_xfer(0), reg_a(src_gpr)); 3102 if (is64) 3103 wrp_mov(nfp_prog, reg_xfer(1), reg_a(src_gpr + 1)); 3104 } 3105 3106 if (!nfp_prog_confirm_current_offset(nfp_prog, out)) 3107 return -EINVAL; 3108 3109 return 0; 3110 } 3111 3112 static int mem_atomic4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3113 { 3114 if (meta->insn.imm != BPF_ADD) 3115 return -EOPNOTSUPP; 3116 3117 return mem_xadd(nfp_prog, meta, false); 3118 } 3119 3120 static int mem_atomic8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3121 { 3122 if (meta->insn.imm != BPF_ADD) 3123 return -EOPNOTSUPP; 3124 3125 return mem_xadd(nfp_prog, meta, true); 3126 } 3127 3128 static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3129 { 3130 emit_br(nfp_prog, BR_UNC, meta->insn.off, 0); 3131 3132 return 0; 3133 } 3134 3135 static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3136 { 3137 const struct bpf_insn *insn = &meta->insn; 3138 u64 imm = insn->imm; /* sign extend */ 3139 swreg or1, or2, tmp_reg; 3140 3141 or1 = reg_a(insn->dst_reg * 2); 3142 or2 = reg_b(insn->dst_reg * 2 + 1); 3143 3144 if (imm & ~0U) { 3145 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 3146 emit_alu(nfp_prog, imm_a(nfp_prog), 3147 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 3148 or1 = imm_a(nfp_prog); 3149 } 3150 3151 if (imm >> 32) { 3152 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 3153 emit_alu(nfp_prog, imm_b(nfp_prog), 3154 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 3155 or2 = imm_b(nfp_prog); 3156 } 3157 3158 emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2); 3159 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 3160 3161 return 0; 3162 } 3163 3164 static int jeq32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3165 { 3166 const struct bpf_insn *insn = &meta->insn; 3167 swreg tmp_reg; 3168 3169 tmp_reg = ur_load_imm_any(nfp_prog, insn->imm, imm_b(nfp_prog)); 3170 emit_alu(nfp_prog, reg_none(), 3171 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 3172 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 3173 3174 return 0; 3175 } 3176 3177 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3178 { 3179 const struct bpf_insn *insn = &meta->insn; 3180 u64 imm = insn->imm; /* sign extend */ 3181 u8 dst_gpr = insn->dst_reg * 2; 3182 swreg tmp_reg; 3183 3184 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 3185 emit_alu(nfp_prog, imm_b(nfp_prog), 3186 reg_a(dst_gpr), ALU_OP_AND, tmp_reg); 3187 /* Upper word of the mask can only be 0 or ~0 from sign extension, 3188 * so either ignore it or OR the whole thing in. 3189 */ 3190 if (is_mbpf_jmp64(meta) && imm >> 32) { 3191 emit_alu(nfp_prog, reg_none(), 3192 reg_a(dst_gpr + 1), ALU_OP_OR, imm_b(nfp_prog)); 3193 } 3194 emit_br(nfp_prog, BR_BNE, insn->off, 0); 3195 3196 return 0; 3197 } 3198 3199 static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3200 { 3201 const struct bpf_insn *insn = &meta->insn; 3202 u64 imm = insn->imm; /* sign extend */ 3203 bool is_jmp32 = is_mbpf_jmp32(meta); 3204 swreg tmp_reg; 3205 3206 if (!imm) { 3207 if (is_jmp32) 3208 emit_alu(nfp_prog, reg_none(), reg_none(), ALU_OP_NONE, 3209 reg_b(insn->dst_reg * 2)); 3210 else 3211 emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2), 3212 ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1)); 3213 emit_br(nfp_prog, BR_BNE, insn->off, 0); 3214 return 0; 3215 } 3216 3217 tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog)); 3218 emit_alu(nfp_prog, reg_none(), 3219 reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg); 3220 emit_br(nfp_prog, BR_BNE, insn->off, 0); 3221 3222 if (is_jmp32) 3223 return 0; 3224 3225 tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog)); 3226 emit_alu(nfp_prog, reg_none(), 3227 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg); 3228 emit_br(nfp_prog, BR_BNE, insn->off, 0); 3229 3230 return 0; 3231 } 3232 3233 static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3234 { 3235 const struct bpf_insn *insn = &meta->insn; 3236 3237 emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2), 3238 ALU_OP_XOR, reg_b(insn->src_reg * 2)); 3239 if (is_mbpf_jmp64(meta)) { 3240 emit_alu(nfp_prog, imm_b(nfp_prog), 3241 reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, 3242 reg_b(insn->src_reg * 2 + 1)); 3243 emit_alu(nfp_prog, reg_none(), imm_a(nfp_prog), ALU_OP_OR, 3244 imm_b(nfp_prog)); 3245 } 3246 emit_br(nfp_prog, BR_BEQ, insn->off, 0); 3247 3248 return 0; 3249 } 3250 3251 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3252 { 3253 return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE); 3254 } 3255 3256 static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3257 { 3258 return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE); 3259 } 3260 3261 static int 3262 bpf_to_bpf_call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3263 { 3264 u32 ret_tgt, stack_depth, offset_br; 3265 swreg tmp_reg; 3266 3267 stack_depth = round_up(nfp_prog->stack_frame_depth, STACK_FRAME_ALIGN); 3268 /* Space for saving the return address is accounted for by the callee, 3269 * so stack_depth can be zero for the main function. 3270 */ 3271 if (stack_depth) { 3272 tmp_reg = ur_load_imm_any(nfp_prog, stack_depth, 3273 stack_imm(nfp_prog)); 3274 emit_alu(nfp_prog, stack_reg(nfp_prog), 3275 stack_reg(nfp_prog), ALU_OP_ADD, tmp_reg); 3276 emit_csr_wr(nfp_prog, stack_reg(nfp_prog), 3277 NFP_CSR_ACT_LM_ADDR0); 3278 } 3279 3280 /* Two cases for jumping to the callee: 3281 * 3282 * - If callee uses and needs to save R6~R9 then: 3283 * 1. Put the start offset of the callee into imm_b(). This will 3284 * require a fixup step, as we do not necessarily know this 3285 * address yet. 3286 * 2. Put the return address from the callee to the caller into 3287 * register ret_reg(). 3288 * 3. (After defer slots are consumed) Jump to the subroutine that 3289 * pushes the registers to the stack. 3290 * The subroutine acts as a trampoline, and returns to the address in 3291 * imm_b(), i.e. jumps to the callee. 3292 * 3293 * - If callee does not need to save R6~R9 then just load return 3294 * address to the caller in ret_reg(), and jump to the callee 3295 * directly. 3296 * 3297 * Using ret_reg() to pass the return address to the callee is set here 3298 * as a convention. The callee can then push this address onto its 3299 * stack frame in its prologue. The advantages of passing the return 3300 * address through ret_reg(), instead of pushing it to the stack right 3301 * here, are the following: 3302 * - It looks cleaner. 3303 * - If the called function is called multiple time, we get a lower 3304 * program size. 3305 * - We save two no-op instructions that should be added just before 3306 * the emit_br() when stack depth is not null otherwise. 3307 * - If we ever find a register to hold the return address during whole 3308 * execution of the callee, we will not have to push the return 3309 * address to the stack for leaf functions. 3310 */ 3311 if (!meta->jmp_dst) { 3312 pr_err("BUG: BPF-to-BPF call has no destination recorded\n"); 3313 return -ELOOP; 3314 } 3315 if (nfp_prog->subprog[meta->jmp_dst->subprog_idx].needs_reg_push) { 3316 ret_tgt = nfp_prog_current_offset(nfp_prog) + 3; 3317 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, 3318 RELO_BR_GO_CALL_PUSH_REGS); 3319 offset_br = nfp_prog_current_offset(nfp_prog); 3320 wrp_immed_relo(nfp_prog, imm_b(nfp_prog), 0, RELO_IMMED_REL); 3321 } else { 3322 ret_tgt = nfp_prog_current_offset(nfp_prog) + 2; 3323 emit_br(nfp_prog, BR_UNC, meta->insn.imm, 1); 3324 offset_br = nfp_prog_current_offset(nfp_prog); 3325 } 3326 wrp_immed_relo(nfp_prog, ret_reg(nfp_prog), ret_tgt, RELO_IMMED_REL); 3327 3328 if (!nfp_prog_confirm_current_offset(nfp_prog, ret_tgt)) 3329 return -EINVAL; 3330 3331 if (stack_depth) { 3332 tmp_reg = ur_load_imm_any(nfp_prog, stack_depth, 3333 stack_imm(nfp_prog)); 3334 emit_alu(nfp_prog, stack_reg(nfp_prog), 3335 stack_reg(nfp_prog), ALU_OP_SUB, tmp_reg); 3336 emit_csr_wr(nfp_prog, stack_reg(nfp_prog), 3337 NFP_CSR_ACT_LM_ADDR0); 3338 wrp_nops(nfp_prog, 3); 3339 } 3340 3341 meta->num_insns_after_br = nfp_prog_current_offset(nfp_prog); 3342 meta->num_insns_after_br -= offset_br; 3343 3344 return 0; 3345 } 3346 3347 static int helper_call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3348 { 3349 switch (meta->insn.imm) { 3350 case BPF_FUNC_xdp_adjust_head: 3351 return adjust_head(nfp_prog, meta); 3352 case BPF_FUNC_xdp_adjust_tail: 3353 return adjust_tail(nfp_prog, meta); 3354 case BPF_FUNC_map_lookup_elem: 3355 case BPF_FUNC_map_update_elem: 3356 case BPF_FUNC_map_delete_elem: 3357 return map_call_stack_common(nfp_prog, meta); 3358 case BPF_FUNC_get_prandom_u32: 3359 return nfp_get_prandom_u32(nfp_prog, meta); 3360 case BPF_FUNC_perf_event_output: 3361 return nfp_perf_event_output(nfp_prog, meta); 3362 default: 3363 WARN_ONCE(1, "verifier allowed unsupported function\n"); 3364 return -EOPNOTSUPP; 3365 } 3366 } 3367 3368 static int call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3369 { 3370 if (is_mbpf_pseudo_call(meta)) 3371 return bpf_to_bpf_call(nfp_prog, meta); 3372 else 3373 return helper_call(nfp_prog, meta); 3374 } 3375 3376 static bool nfp_is_main_function(struct nfp_insn_meta *meta) 3377 { 3378 return meta->subprog_idx == 0; 3379 } 3380 3381 static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3382 { 3383 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 0, RELO_BR_GO_OUT); 3384 3385 return 0; 3386 } 3387 3388 static int 3389 nfp_subprog_epilogue(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3390 { 3391 if (nfp_prog->subprog[meta->subprog_idx].needs_reg_push) { 3392 /* Pop R6~R9 to the stack via related subroutine. 3393 * We loaded the return address to the caller into ret_reg(). 3394 * This means that the subroutine does not come back here, we 3395 * make it jump back to the subprogram caller directly! 3396 */ 3397 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 1, 3398 RELO_BR_GO_CALL_POP_REGS); 3399 /* Pop return address from the stack. */ 3400 wrp_mov(nfp_prog, ret_reg(nfp_prog), reg_lm(0, 0)); 3401 } else { 3402 /* Pop return address from the stack. */ 3403 wrp_mov(nfp_prog, ret_reg(nfp_prog), reg_lm(0, 0)); 3404 /* Jump back to caller if no callee-saved registers were used 3405 * by the subprogram. 3406 */ 3407 emit_rtn(nfp_prog, ret_reg(nfp_prog), 0); 3408 } 3409 3410 return 0; 3411 } 3412 3413 static int jmp_exit(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3414 { 3415 if (nfp_is_main_function(meta)) 3416 return goto_out(nfp_prog, meta); 3417 else 3418 return nfp_subprog_epilogue(nfp_prog, meta); 3419 } 3420 3421 static const instr_cb_t instr_cb[256] = { 3422 [BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64, 3423 [BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64, 3424 [BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64, 3425 [BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64, 3426 [BPF_ALU64 | BPF_AND | BPF_X] = and_reg64, 3427 [BPF_ALU64 | BPF_AND | BPF_K] = and_imm64, 3428 [BPF_ALU64 | BPF_OR | BPF_X] = or_reg64, 3429 [BPF_ALU64 | BPF_OR | BPF_K] = or_imm64, 3430 [BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64, 3431 [BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64, 3432 [BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64, 3433 [BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64, 3434 [BPF_ALU64 | BPF_MUL | BPF_X] = mul_reg64, 3435 [BPF_ALU64 | BPF_MUL | BPF_K] = mul_imm64, 3436 [BPF_ALU64 | BPF_DIV | BPF_X] = div_reg64, 3437 [BPF_ALU64 | BPF_DIV | BPF_K] = div_imm64, 3438 [BPF_ALU64 | BPF_NEG] = neg_reg64, 3439 [BPF_ALU64 | BPF_LSH | BPF_X] = shl_reg64, 3440 [BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64, 3441 [BPF_ALU64 | BPF_RSH | BPF_X] = shr_reg64, 3442 [BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64, 3443 [BPF_ALU64 | BPF_ARSH | BPF_X] = ashr_reg64, 3444 [BPF_ALU64 | BPF_ARSH | BPF_K] = ashr_imm64, 3445 [BPF_ALU | BPF_MOV | BPF_X] = mov_reg, 3446 [BPF_ALU | BPF_MOV | BPF_K] = mov_imm, 3447 [BPF_ALU | BPF_XOR | BPF_X] = xor_reg, 3448 [BPF_ALU | BPF_XOR | BPF_K] = xor_imm, 3449 [BPF_ALU | BPF_AND | BPF_X] = and_reg, 3450 [BPF_ALU | BPF_AND | BPF_K] = and_imm, 3451 [BPF_ALU | BPF_OR | BPF_X] = or_reg, 3452 [BPF_ALU | BPF_OR | BPF_K] = or_imm, 3453 [BPF_ALU | BPF_ADD | BPF_X] = add_reg, 3454 [BPF_ALU | BPF_ADD | BPF_K] = add_imm, 3455 [BPF_ALU | BPF_SUB | BPF_X] = sub_reg, 3456 [BPF_ALU | BPF_SUB | BPF_K] = sub_imm, 3457 [BPF_ALU | BPF_MUL | BPF_X] = mul_reg, 3458 [BPF_ALU | BPF_MUL | BPF_K] = mul_imm, 3459 [BPF_ALU | BPF_DIV | BPF_X] = div_reg, 3460 [BPF_ALU | BPF_DIV | BPF_K] = div_imm, 3461 [BPF_ALU | BPF_NEG] = neg_reg, 3462 [BPF_ALU | BPF_LSH | BPF_X] = shl_reg, 3463 [BPF_ALU | BPF_LSH | BPF_K] = shl_imm, 3464 [BPF_ALU | BPF_RSH | BPF_X] = shr_reg, 3465 [BPF_ALU | BPF_RSH | BPF_K] = shr_imm, 3466 [BPF_ALU | BPF_ARSH | BPF_X] = ashr_reg, 3467 [BPF_ALU | BPF_ARSH | BPF_K] = ashr_imm, 3468 [BPF_ALU | BPF_END | BPF_X] = end_reg32, 3469 [BPF_LD | BPF_IMM | BPF_DW] = imm_ld8, 3470 [BPF_LD | BPF_ABS | BPF_B] = data_ld1, 3471 [BPF_LD | BPF_ABS | BPF_H] = data_ld2, 3472 [BPF_LD | BPF_ABS | BPF_W] = data_ld4, 3473 [BPF_LD | BPF_IND | BPF_B] = data_ind_ld1, 3474 [BPF_LD | BPF_IND | BPF_H] = data_ind_ld2, 3475 [BPF_LD | BPF_IND | BPF_W] = data_ind_ld4, 3476 [BPF_LDX | BPF_MEM | BPF_B] = mem_ldx1, 3477 [BPF_LDX | BPF_MEM | BPF_H] = mem_ldx2, 3478 [BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4, 3479 [BPF_LDX | BPF_MEM | BPF_DW] = mem_ldx8, 3480 [BPF_STX | BPF_MEM | BPF_B] = mem_stx1, 3481 [BPF_STX | BPF_MEM | BPF_H] = mem_stx2, 3482 [BPF_STX | BPF_MEM | BPF_W] = mem_stx4, 3483 [BPF_STX | BPF_MEM | BPF_DW] = mem_stx8, 3484 [BPF_STX | BPF_ATOMIC | BPF_W] = mem_atomic4, 3485 [BPF_STX | BPF_ATOMIC | BPF_DW] = mem_atomic8, 3486 [BPF_ST | BPF_MEM | BPF_B] = mem_st1, 3487 [BPF_ST | BPF_MEM | BPF_H] = mem_st2, 3488 [BPF_ST | BPF_MEM | BPF_W] = mem_st4, 3489 [BPF_ST | BPF_MEM | BPF_DW] = mem_st8, 3490 [BPF_JMP | BPF_JA | BPF_K] = jump, 3491 [BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm, 3492 [BPF_JMP | BPF_JGT | BPF_K] = cmp_imm, 3493 [BPF_JMP | BPF_JGE | BPF_K] = cmp_imm, 3494 [BPF_JMP | BPF_JLT | BPF_K] = cmp_imm, 3495 [BPF_JMP | BPF_JLE | BPF_K] = cmp_imm, 3496 [BPF_JMP | BPF_JSGT | BPF_K] = cmp_imm, 3497 [BPF_JMP | BPF_JSGE | BPF_K] = cmp_imm, 3498 [BPF_JMP | BPF_JSLT | BPF_K] = cmp_imm, 3499 [BPF_JMP | BPF_JSLE | BPF_K] = cmp_imm, 3500 [BPF_JMP | BPF_JSET | BPF_K] = jset_imm, 3501 [BPF_JMP | BPF_JNE | BPF_K] = jne_imm, 3502 [BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg, 3503 [BPF_JMP | BPF_JGT | BPF_X] = cmp_reg, 3504 [BPF_JMP | BPF_JGE | BPF_X] = cmp_reg, 3505 [BPF_JMP | BPF_JLT | BPF_X] = cmp_reg, 3506 [BPF_JMP | BPF_JLE | BPF_X] = cmp_reg, 3507 [BPF_JMP | BPF_JSGT | BPF_X] = cmp_reg, 3508 [BPF_JMP | BPF_JSGE | BPF_X] = cmp_reg, 3509 [BPF_JMP | BPF_JSLT | BPF_X] = cmp_reg, 3510 [BPF_JMP | BPF_JSLE | BPF_X] = cmp_reg, 3511 [BPF_JMP | BPF_JSET | BPF_X] = jset_reg, 3512 [BPF_JMP | BPF_JNE | BPF_X] = jne_reg, 3513 [BPF_JMP32 | BPF_JEQ | BPF_K] = jeq32_imm, 3514 [BPF_JMP32 | BPF_JGT | BPF_K] = cmp_imm, 3515 [BPF_JMP32 | BPF_JGE | BPF_K] = cmp_imm, 3516 [BPF_JMP32 | BPF_JLT | BPF_K] = cmp_imm, 3517 [BPF_JMP32 | BPF_JLE | BPF_K] = cmp_imm, 3518 [BPF_JMP32 | BPF_JSGT | BPF_K] =cmp_imm, 3519 [BPF_JMP32 | BPF_JSGE | BPF_K] =cmp_imm, 3520 [BPF_JMP32 | BPF_JSLT | BPF_K] =cmp_imm, 3521 [BPF_JMP32 | BPF_JSLE | BPF_K] =cmp_imm, 3522 [BPF_JMP32 | BPF_JSET | BPF_K] =jset_imm, 3523 [BPF_JMP32 | BPF_JNE | BPF_K] = jne_imm, 3524 [BPF_JMP32 | BPF_JEQ | BPF_X] = jeq_reg, 3525 [BPF_JMP32 | BPF_JGT | BPF_X] = cmp_reg, 3526 [BPF_JMP32 | BPF_JGE | BPF_X] = cmp_reg, 3527 [BPF_JMP32 | BPF_JLT | BPF_X] = cmp_reg, 3528 [BPF_JMP32 | BPF_JLE | BPF_X] = cmp_reg, 3529 [BPF_JMP32 | BPF_JSGT | BPF_X] =cmp_reg, 3530 [BPF_JMP32 | BPF_JSGE | BPF_X] =cmp_reg, 3531 [BPF_JMP32 | BPF_JSLT | BPF_X] =cmp_reg, 3532 [BPF_JMP32 | BPF_JSLE | BPF_X] =cmp_reg, 3533 [BPF_JMP32 | BPF_JSET | BPF_X] =jset_reg, 3534 [BPF_JMP32 | BPF_JNE | BPF_X] = jne_reg, 3535 [BPF_JMP | BPF_CALL] = call, 3536 [BPF_JMP | BPF_EXIT] = jmp_exit, 3537 }; 3538 3539 /* --- Assembler logic --- */ 3540 static int 3541 nfp_fixup_immed_relo(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, 3542 struct nfp_insn_meta *jmp_dst, u32 br_idx) 3543 { 3544 if (immed_get_value(nfp_prog->prog[br_idx + 1])) { 3545 pr_err("BUG: failed to fix up callee register saving\n"); 3546 return -EINVAL; 3547 } 3548 3549 immed_set_value(&nfp_prog->prog[br_idx + 1], jmp_dst->off); 3550 3551 return 0; 3552 } 3553 3554 static int nfp_fixup_branches(struct nfp_prog *nfp_prog) 3555 { 3556 struct nfp_insn_meta *meta, *jmp_dst; 3557 u32 idx, br_idx; 3558 int err; 3559 3560 list_for_each_entry(meta, &nfp_prog->insns, l) { 3561 if (meta->flags & FLAG_INSN_SKIP_MASK) 3562 continue; 3563 if (!is_mbpf_jmp(meta)) 3564 continue; 3565 if (meta->insn.code == (BPF_JMP | BPF_EXIT) && 3566 !nfp_is_main_function(meta)) 3567 continue; 3568 if (is_mbpf_helper_call(meta)) 3569 continue; 3570 3571 if (list_is_last(&meta->l, &nfp_prog->insns)) 3572 br_idx = nfp_prog->last_bpf_off; 3573 else 3574 br_idx = list_next_entry(meta, l)->off - 1; 3575 3576 /* For BPF-to-BPF function call, a stack adjustment sequence is 3577 * generated after the return instruction. Therefore, we must 3578 * withdraw the length of this sequence to have br_idx pointing 3579 * to where the "branch" NFP instruction is expected to be. 3580 */ 3581 if (is_mbpf_pseudo_call(meta)) 3582 br_idx -= meta->num_insns_after_br; 3583 3584 if (!nfp_is_br(nfp_prog->prog[br_idx])) { 3585 pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n", 3586 br_idx, meta->insn.code, nfp_prog->prog[br_idx]); 3587 return -ELOOP; 3588 } 3589 3590 if (meta->insn.code == (BPF_JMP | BPF_EXIT)) 3591 continue; 3592 3593 /* Leave special branches for later */ 3594 if (FIELD_GET(OP_RELO_TYPE, nfp_prog->prog[br_idx]) != 3595 RELO_BR_REL && !is_mbpf_pseudo_call(meta)) 3596 continue; 3597 3598 if (!meta->jmp_dst) { 3599 pr_err("Non-exit jump doesn't have destination info recorded!!\n"); 3600 return -ELOOP; 3601 } 3602 3603 jmp_dst = meta->jmp_dst; 3604 3605 if (jmp_dst->flags & FLAG_INSN_SKIP_PREC_DEPENDENT) { 3606 pr_err("Branch landing on removed instruction!!\n"); 3607 return -ELOOP; 3608 } 3609 3610 if (is_mbpf_pseudo_call(meta) && 3611 nfp_prog->subprog[jmp_dst->subprog_idx].needs_reg_push) { 3612 err = nfp_fixup_immed_relo(nfp_prog, meta, 3613 jmp_dst, br_idx); 3614 if (err) 3615 return err; 3616 } 3617 3618 if (FIELD_GET(OP_RELO_TYPE, nfp_prog->prog[br_idx]) != 3619 RELO_BR_REL) 3620 continue; 3621 3622 for (idx = meta->off; idx <= br_idx; idx++) { 3623 if (!nfp_is_br(nfp_prog->prog[idx])) 3624 continue; 3625 br_set_offset(&nfp_prog->prog[idx], jmp_dst->off); 3626 } 3627 } 3628 3629 return 0; 3630 } 3631 3632 static void nfp_intro(struct nfp_prog *nfp_prog) 3633 { 3634 wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0)); 3635 emit_alu(nfp_prog, plen_reg(nfp_prog), 3636 plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog)); 3637 } 3638 3639 static void 3640 nfp_subprog_prologue(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3641 { 3642 /* Save return address into the stack. */ 3643 wrp_mov(nfp_prog, reg_lm(0, 0), ret_reg(nfp_prog)); 3644 } 3645 3646 static void 3647 nfp_start_subprog(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) 3648 { 3649 unsigned int depth = nfp_prog->subprog[meta->subprog_idx].stack_depth; 3650 3651 nfp_prog->stack_frame_depth = round_up(depth, 4); 3652 nfp_subprog_prologue(nfp_prog, meta); 3653 } 3654 3655 bool nfp_is_subprog_start(struct nfp_insn_meta *meta) 3656 { 3657 return meta->flags & FLAG_INSN_IS_SUBPROG_START; 3658 } 3659 3660 static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) 3661 { 3662 /* TC direct-action mode: 3663 * 0,1 ok NOT SUPPORTED[1] 3664 * 2 drop 0x22 -> drop, count as stat1 3665 * 4,5 nuke 0x02 -> drop 3666 * 7 redir 0x44 -> redir, count as stat2 3667 * * unspec 0x11 -> pass, count as stat0 3668 * 3669 * [1] We can't support OK and RECLASSIFY because we can't tell TC 3670 * the exact decision made. We are forced to support UNSPEC 3671 * to handle aborts so that's the only one we handle for passing 3672 * packets up the stack. 3673 */ 3674 /* Target for aborts */ 3675 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 3676 3677 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); 3678 3679 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 3680 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); 3681 3682 /* Target for normal exits */ 3683 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 3684 3685 /* if R0 > 7 jump to abort */ 3686 emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0)); 3687 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 3688 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 3689 3690 wrp_immed(nfp_prog, reg_b(2), 0x41221211); 3691 wrp_immed(nfp_prog, reg_b(3), 0x41001211); 3692 3693 emit_shf(nfp_prog, reg_a(1), 3694 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2); 3695 3696 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 3697 emit_shf(nfp_prog, reg_a(2), 3698 reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 3699 3700 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 3701 emit_shf(nfp_prog, reg_b(2), 3702 reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); 3703 3704 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); 3705 3706 emit_shf(nfp_prog, reg_b(2), 3707 reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); 3708 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 3709 } 3710 3711 static void nfp_outro_xdp(struct nfp_prog *nfp_prog) 3712 { 3713 /* XDP return codes: 3714 * 0 aborted 0x82 -> drop, count as stat3 3715 * 1 drop 0x22 -> drop, count as stat1 3716 * 2 pass 0x11 -> pass, count as stat0 3717 * 3 tx 0x44 -> redir, count as stat2 3718 * * unknown 0x82 -> drop, count as stat3 3719 */ 3720 /* Target for aborts */ 3721 nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); 3722 3723 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); 3724 3725 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 3726 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16); 3727 3728 /* Target for normal exits */ 3729 nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog); 3730 3731 /* if R0 > 3 jump to abort */ 3732 emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0)); 3733 emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0); 3734 3735 wrp_immed(nfp_prog, reg_b(2), 0x44112282); 3736 3737 emit_shf(nfp_prog, reg_a(1), 3738 reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3); 3739 3740 emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0)); 3741 emit_shf(nfp_prog, reg_b(2), 3742 reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); 3743 3744 emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); 3745 3746 wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); 3747 emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); 3748 } 3749 3750 static bool nfp_prog_needs_callee_reg_save(struct nfp_prog *nfp_prog) 3751 { 3752 unsigned int idx; 3753 3754 for (idx = 1; idx < nfp_prog->subprog_cnt; idx++) 3755 if (nfp_prog->subprog[idx].needs_reg_push) 3756 return true; 3757 3758 return false; 3759 } 3760 3761 static void nfp_push_callee_registers(struct nfp_prog *nfp_prog) 3762 { 3763 u8 reg; 3764 3765 /* Subroutine: Save all callee saved registers (R6 ~ R9). 3766 * imm_b() holds the return address. 3767 */ 3768 nfp_prog->tgt_call_push_regs = nfp_prog_current_offset(nfp_prog); 3769 for (reg = BPF_REG_6; reg <= BPF_REG_9; reg++) { 3770 u8 adj = (reg - BPF_REG_0) * 2; 3771 u8 idx = (reg - BPF_REG_6) * 2; 3772 3773 /* The first slot in the stack frame is used to push the return 3774 * address in bpf_to_bpf_call(), start just after. 3775 */ 3776 wrp_mov(nfp_prog, reg_lm(0, 1 + idx), reg_b(adj)); 3777 3778 if (reg == BPF_REG_8) 3779 /* Prepare to jump back, last 3 insns use defer slots */ 3780 emit_rtn(nfp_prog, imm_b(nfp_prog), 3); 3781 3782 wrp_mov(nfp_prog, reg_lm(0, 1 + idx + 1), reg_b(adj + 1)); 3783 } 3784 } 3785 3786 static void nfp_pop_callee_registers(struct nfp_prog *nfp_prog) 3787 { 3788 u8 reg; 3789 3790 /* Subroutine: Restore all callee saved registers (R6 ~ R9). 3791 * ret_reg() holds the return address. 3792 */ 3793 nfp_prog->tgt_call_pop_regs = nfp_prog_current_offset(nfp_prog); 3794 for (reg = BPF_REG_6; reg <= BPF_REG_9; reg++) { 3795 u8 adj = (reg - BPF_REG_0) * 2; 3796 u8 idx = (reg - BPF_REG_6) * 2; 3797 3798 /* The first slot in the stack frame holds the return address, 3799 * start popping just after that. 3800 */ 3801 wrp_mov(nfp_prog, reg_both(adj), reg_lm(0, 1 + idx)); 3802 3803 if (reg == BPF_REG_8) 3804 /* Prepare to jump back, last 3 insns use defer slots */ 3805 emit_rtn(nfp_prog, ret_reg(nfp_prog), 3); 3806 3807 wrp_mov(nfp_prog, reg_both(adj + 1), reg_lm(0, 1 + idx + 1)); 3808 } 3809 } 3810 3811 static void nfp_outro(struct nfp_prog *nfp_prog) 3812 { 3813 switch (nfp_prog->type) { 3814 case BPF_PROG_TYPE_SCHED_CLS: 3815 nfp_outro_tc_da(nfp_prog); 3816 break; 3817 case BPF_PROG_TYPE_XDP: 3818 nfp_outro_xdp(nfp_prog); 3819 break; 3820 default: 3821 WARN_ON(1); 3822 } 3823 3824 if (!nfp_prog_needs_callee_reg_save(nfp_prog)) 3825 return; 3826 3827 nfp_push_callee_registers(nfp_prog); 3828 nfp_pop_callee_registers(nfp_prog); 3829 } 3830 3831 static int nfp_translate(struct nfp_prog *nfp_prog) 3832 { 3833 struct nfp_insn_meta *meta; 3834 unsigned int depth; 3835 int err; 3836 3837 depth = nfp_prog->subprog[0].stack_depth; 3838 nfp_prog->stack_frame_depth = round_up(depth, 4); 3839 3840 nfp_intro(nfp_prog); 3841 if (nfp_prog->error) 3842 return nfp_prog->error; 3843 3844 list_for_each_entry(meta, &nfp_prog->insns, l) { 3845 instr_cb_t cb = instr_cb[meta->insn.code]; 3846 3847 meta->off = nfp_prog_current_offset(nfp_prog); 3848 3849 if (nfp_is_subprog_start(meta)) { 3850 nfp_start_subprog(nfp_prog, meta); 3851 if (nfp_prog->error) 3852 return nfp_prog->error; 3853 } 3854 3855 if (meta->flags & FLAG_INSN_SKIP_MASK) { 3856 nfp_prog->n_translated++; 3857 continue; 3858 } 3859 3860 if (nfp_meta_has_prev(nfp_prog, meta) && 3861 nfp_meta_prev(meta)->double_cb) 3862 cb = nfp_meta_prev(meta)->double_cb; 3863 if (!cb) 3864 return -ENOENT; 3865 err = cb(nfp_prog, meta); 3866 if (err) 3867 return err; 3868 if (nfp_prog->error) 3869 return nfp_prog->error; 3870 3871 nfp_prog->n_translated++; 3872 } 3873 3874 nfp_prog->last_bpf_off = nfp_prog_current_offset(nfp_prog) - 1; 3875 3876 nfp_outro(nfp_prog); 3877 if (nfp_prog->error) 3878 return nfp_prog->error; 3879 3880 wrp_nops(nfp_prog, NFP_USTORE_PREFETCH_WINDOW); 3881 if (nfp_prog->error) 3882 return nfp_prog->error; 3883 3884 return nfp_fixup_branches(nfp_prog); 3885 } 3886 3887 /* --- Optimizations --- */ 3888 static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog) 3889 { 3890 struct nfp_insn_meta *meta; 3891 3892 list_for_each_entry(meta, &nfp_prog->insns, l) { 3893 struct bpf_insn insn = meta->insn; 3894 3895 /* Programs converted from cBPF start with register xoring */ 3896 if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) && 3897 insn.src_reg == insn.dst_reg) 3898 continue; 3899 3900 /* Programs start with R6 = R1 but we ignore the skb pointer */ 3901 if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) && 3902 insn.src_reg == 1 && insn.dst_reg == 6) 3903 meta->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 3904 3905 /* Return as soon as something doesn't match */ 3906 if (!(meta->flags & FLAG_INSN_SKIP_MASK)) 3907 return; 3908 } 3909 } 3910 3911 /* abs(insn.imm) will fit better into unrestricted reg immediate - 3912 * convert add/sub of a negative number into a sub/add of a positive one. 3913 */ 3914 static void nfp_bpf_opt_neg_add_sub(struct nfp_prog *nfp_prog) 3915 { 3916 struct nfp_insn_meta *meta; 3917 3918 list_for_each_entry(meta, &nfp_prog->insns, l) { 3919 struct bpf_insn insn = meta->insn; 3920 3921 if (meta->flags & FLAG_INSN_SKIP_MASK) 3922 continue; 3923 3924 if (!is_mbpf_alu(meta) && !is_mbpf_jmp(meta)) 3925 continue; 3926 if (BPF_SRC(insn.code) != BPF_K) 3927 continue; 3928 if (insn.imm >= 0) 3929 continue; 3930 3931 if (is_mbpf_jmp(meta)) { 3932 switch (BPF_OP(insn.code)) { 3933 case BPF_JGE: 3934 case BPF_JSGE: 3935 case BPF_JLT: 3936 case BPF_JSLT: 3937 meta->jump_neg_op = true; 3938 break; 3939 default: 3940 continue; 3941 } 3942 } else { 3943 if (BPF_OP(insn.code) == BPF_ADD) 3944 insn.code = BPF_CLASS(insn.code) | BPF_SUB; 3945 else if (BPF_OP(insn.code) == BPF_SUB) 3946 insn.code = BPF_CLASS(insn.code) | BPF_ADD; 3947 else 3948 continue; 3949 3950 meta->insn.code = insn.code | BPF_K; 3951 } 3952 3953 meta->insn.imm = -insn.imm; 3954 } 3955 } 3956 3957 /* Remove masking after load since our load guarantees this is not needed */ 3958 static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog) 3959 { 3960 struct nfp_insn_meta *meta1, *meta2; 3961 static const s32 exp_mask[] = { 3962 [BPF_B] = 0x000000ffU, 3963 [BPF_H] = 0x0000ffffU, 3964 [BPF_W] = 0xffffffffU, 3965 }; 3966 3967 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 3968 struct bpf_insn insn, next; 3969 3970 insn = meta1->insn; 3971 next = meta2->insn; 3972 3973 if (BPF_CLASS(insn.code) != BPF_LD) 3974 continue; 3975 if (BPF_MODE(insn.code) != BPF_ABS && 3976 BPF_MODE(insn.code) != BPF_IND) 3977 continue; 3978 3979 if (next.code != (BPF_ALU64 | BPF_AND | BPF_K)) 3980 continue; 3981 3982 if (!exp_mask[BPF_SIZE(insn.code)]) 3983 continue; 3984 if (exp_mask[BPF_SIZE(insn.code)] != next.imm) 3985 continue; 3986 3987 if (next.src_reg || next.dst_reg) 3988 continue; 3989 3990 if (meta2->flags & FLAG_INSN_IS_JUMP_DST) 3991 continue; 3992 3993 meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 3994 } 3995 } 3996 3997 static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog) 3998 { 3999 struct nfp_insn_meta *meta1, *meta2, *meta3; 4000 4001 nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) { 4002 struct bpf_insn insn, next1, next2; 4003 4004 insn = meta1->insn; 4005 next1 = meta2->insn; 4006 next2 = meta3->insn; 4007 4008 if (BPF_CLASS(insn.code) != BPF_LD) 4009 continue; 4010 if (BPF_MODE(insn.code) != BPF_ABS && 4011 BPF_MODE(insn.code) != BPF_IND) 4012 continue; 4013 if (BPF_SIZE(insn.code) != BPF_W) 4014 continue; 4015 4016 if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) && 4017 next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) && 4018 !(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) && 4019 next2.code == (BPF_LSH | BPF_K | BPF_ALU64))) 4020 continue; 4021 4022 if (next1.src_reg || next1.dst_reg || 4023 next2.src_reg || next2.dst_reg) 4024 continue; 4025 4026 if (next1.imm != 0x20 || next2.imm != 0x20) 4027 continue; 4028 4029 if (meta2->flags & FLAG_INSN_IS_JUMP_DST || 4030 meta3->flags & FLAG_INSN_IS_JUMP_DST) 4031 continue; 4032 4033 meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 4034 meta3->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 4035 } 4036 } 4037 4038 /* load/store pair that forms memory copy sould look like the following: 4039 * 4040 * ld_width R, [addr_src + offset_src] 4041 * st_width [addr_dest + offset_dest], R 4042 * 4043 * The destination register of load and source register of store should 4044 * be the same, load and store should also perform at the same width. 4045 * If either of addr_src or addr_dest is stack pointer, we don't do the 4046 * CPP optimization as stack is modelled by registers on NFP. 4047 */ 4048 static bool 4049 curr_pair_is_memcpy(struct nfp_insn_meta *ld_meta, 4050 struct nfp_insn_meta *st_meta) 4051 { 4052 struct bpf_insn *ld = &ld_meta->insn; 4053 struct bpf_insn *st = &st_meta->insn; 4054 4055 if (!is_mbpf_load(ld_meta) || !is_mbpf_store(st_meta)) 4056 return false; 4057 4058 if (ld_meta->ptr.type != PTR_TO_PACKET && 4059 ld_meta->ptr.type != PTR_TO_MAP_VALUE) 4060 return false; 4061 4062 if (st_meta->ptr.type != PTR_TO_PACKET) 4063 return false; 4064 4065 if (BPF_SIZE(ld->code) != BPF_SIZE(st->code)) 4066 return false; 4067 4068 if (ld->dst_reg != st->src_reg) 4069 return false; 4070 4071 /* There is jump to the store insn in this pair. */ 4072 if (st_meta->flags & FLAG_INSN_IS_JUMP_DST) 4073 return false; 4074 4075 return true; 4076 } 4077 4078 /* Currently, we only support chaining load/store pairs if: 4079 * 4080 * - Their address base registers are the same. 4081 * - Their address offsets are in the same order. 4082 * - They operate at the same memory width. 4083 * - There is no jump into the middle of them. 4084 */ 4085 static bool 4086 curr_pair_chain_with_previous(struct nfp_insn_meta *ld_meta, 4087 struct nfp_insn_meta *st_meta, 4088 struct bpf_insn *prev_ld, 4089 struct bpf_insn *prev_st) 4090 { 4091 u8 prev_size, curr_size, prev_ld_base, prev_st_base, prev_ld_dst; 4092 struct bpf_insn *ld = &ld_meta->insn; 4093 struct bpf_insn *st = &st_meta->insn; 4094 s16 prev_ld_off, prev_st_off; 4095 4096 /* This pair is the start pair. */ 4097 if (!prev_ld) 4098 return true; 4099 4100 prev_size = BPF_LDST_BYTES(prev_ld); 4101 curr_size = BPF_LDST_BYTES(ld); 4102 prev_ld_base = prev_ld->src_reg; 4103 prev_st_base = prev_st->dst_reg; 4104 prev_ld_dst = prev_ld->dst_reg; 4105 prev_ld_off = prev_ld->off; 4106 prev_st_off = prev_st->off; 4107 4108 if (ld->dst_reg != prev_ld_dst) 4109 return false; 4110 4111 if (ld->src_reg != prev_ld_base || st->dst_reg != prev_st_base) 4112 return false; 4113 4114 if (curr_size != prev_size) 4115 return false; 4116 4117 /* There is jump to the head of this pair. */ 4118 if (ld_meta->flags & FLAG_INSN_IS_JUMP_DST) 4119 return false; 4120 4121 /* Both in ascending order. */ 4122 if (prev_ld_off + prev_size == ld->off && 4123 prev_st_off + prev_size == st->off) 4124 return true; 4125 4126 /* Both in descending order. */ 4127 if (ld->off + curr_size == prev_ld_off && 4128 st->off + curr_size == prev_st_off) 4129 return true; 4130 4131 return false; 4132 } 4133 4134 /* Return TRUE if cross memory access happens. Cross memory access means 4135 * store area is overlapping with load area that a later load might load 4136 * the value from previous store, for this case we can't treat the sequence 4137 * as an memory copy. 4138 */ 4139 static bool 4140 cross_mem_access(struct bpf_insn *ld, struct nfp_insn_meta *head_ld_meta, 4141 struct nfp_insn_meta *head_st_meta) 4142 { 4143 s16 head_ld_off, head_st_off, ld_off; 4144 4145 /* Different pointer types does not overlap. */ 4146 if (head_ld_meta->ptr.type != head_st_meta->ptr.type) 4147 return false; 4148 4149 /* load and store are both PTR_TO_PACKET, check ID info. */ 4150 if (head_ld_meta->ptr.id != head_st_meta->ptr.id) 4151 return true; 4152 4153 /* Canonicalize the offsets. Turn all of them against the original 4154 * base register. 4155 */ 4156 head_ld_off = head_ld_meta->insn.off + head_ld_meta->ptr.off; 4157 head_st_off = head_st_meta->insn.off + head_st_meta->ptr.off; 4158 ld_off = ld->off + head_ld_meta->ptr.off; 4159 4160 /* Ascending order cross. */ 4161 if (ld_off > head_ld_off && 4162 head_ld_off < head_st_off && ld_off >= head_st_off) 4163 return true; 4164 4165 /* Descending order cross. */ 4166 if (ld_off < head_ld_off && 4167 head_ld_off > head_st_off && ld_off <= head_st_off) 4168 return true; 4169 4170 return false; 4171 } 4172 4173 /* This pass try to identify the following instructoin sequences. 4174 * 4175 * load R, [regA + offA] 4176 * store [regB + offB], R 4177 * load R, [regA + offA + const_imm_A] 4178 * store [regB + offB + const_imm_A], R 4179 * load R, [regA + offA + 2 * const_imm_A] 4180 * store [regB + offB + 2 * const_imm_A], R 4181 * ... 4182 * 4183 * Above sequence is typically generated by compiler when lowering 4184 * memcpy. NFP prefer using CPP instructions to accelerate it. 4185 */ 4186 static void nfp_bpf_opt_ldst_gather(struct nfp_prog *nfp_prog) 4187 { 4188 struct nfp_insn_meta *head_ld_meta = NULL; 4189 struct nfp_insn_meta *head_st_meta = NULL; 4190 struct nfp_insn_meta *meta1, *meta2; 4191 struct bpf_insn *prev_ld = NULL; 4192 struct bpf_insn *prev_st = NULL; 4193 u8 count = 0; 4194 4195 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 4196 struct bpf_insn *ld = &meta1->insn; 4197 struct bpf_insn *st = &meta2->insn; 4198 4199 /* Reset record status if any of the following if true: 4200 * - The current insn pair is not load/store. 4201 * - The load/store pair doesn't chain with previous one. 4202 * - The chained load/store pair crossed with previous pair. 4203 * - The chained load/store pair has a total size of memory 4204 * copy beyond 128 bytes which is the maximum length a 4205 * single NFP CPP command can transfer. 4206 */ 4207 if (!curr_pair_is_memcpy(meta1, meta2) || 4208 !curr_pair_chain_with_previous(meta1, meta2, prev_ld, 4209 prev_st) || 4210 (head_ld_meta && (cross_mem_access(ld, head_ld_meta, 4211 head_st_meta) || 4212 head_ld_meta->ldst_gather_len >= 128))) { 4213 if (!count) 4214 continue; 4215 4216 if (count > 1) { 4217 s16 prev_ld_off = prev_ld->off; 4218 s16 prev_st_off = prev_st->off; 4219 s16 head_ld_off = head_ld_meta->insn.off; 4220 4221 if (prev_ld_off < head_ld_off) { 4222 head_ld_meta->insn.off = prev_ld_off; 4223 head_st_meta->insn.off = prev_st_off; 4224 head_ld_meta->ldst_gather_len = 4225 -head_ld_meta->ldst_gather_len; 4226 } 4227 4228 head_ld_meta->paired_st = &head_st_meta->insn; 4229 head_st_meta->flags |= 4230 FLAG_INSN_SKIP_PREC_DEPENDENT; 4231 } else { 4232 head_ld_meta->ldst_gather_len = 0; 4233 } 4234 4235 /* If the chain is ended by an load/store pair then this 4236 * could serve as the new head of the next chain. 4237 */ 4238 if (curr_pair_is_memcpy(meta1, meta2)) { 4239 head_ld_meta = meta1; 4240 head_st_meta = meta2; 4241 head_ld_meta->ldst_gather_len = 4242 BPF_LDST_BYTES(ld); 4243 meta1 = nfp_meta_next(meta1); 4244 meta2 = nfp_meta_next(meta2); 4245 prev_ld = ld; 4246 prev_st = st; 4247 count = 1; 4248 } else { 4249 head_ld_meta = NULL; 4250 head_st_meta = NULL; 4251 prev_ld = NULL; 4252 prev_st = NULL; 4253 count = 0; 4254 } 4255 4256 continue; 4257 } 4258 4259 if (!head_ld_meta) { 4260 head_ld_meta = meta1; 4261 head_st_meta = meta2; 4262 } else { 4263 meta1->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 4264 meta2->flags |= FLAG_INSN_SKIP_PREC_DEPENDENT; 4265 } 4266 4267 head_ld_meta->ldst_gather_len += BPF_LDST_BYTES(ld); 4268 meta1 = nfp_meta_next(meta1); 4269 meta2 = nfp_meta_next(meta2); 4270 prev_ld = ld; 4271 prev_st = st; 4272 count++; 4273 } 4274 } 4275 4276 static void nfp_bpf_opt_pkt_cache(struct nfp_prog *nfp_prog) 4277 { 4278 struct nfp_insn_meta *meta, *range_node = NULL; 4279 s16 range_start = 0, range_end = 0; 4280 bool cache_avail = false; 4281 struct bpf_insn *insn; 4282 s32 range_ptr_off = 0; 4283 u32 range_ptr_id = 0; 4284 4285 list_for_each_entry(meta, &nfp_prog->insns, l) { 4286 if (meta->flags & FLAG_INSN_IS_JUMP_DST) 4287 cache_avail = false; 4288 4289 if (meta->flags & FLAG_INSN_SKIP_MASK) 4290 continue; 4291 4292 insn = &meta->insn; 4293 4294 if (is_mbpf_store_pkt(meta) || 4295 insn->code == (BPF_JMP | BPF_CALL) || 4296 is_mbpf_classic_store_pkt(meta) || 4297 is_mbpf_classic_load(meta)) { 4298 cache_avail = false; 4299 continue; 4300 } 4301 4302 if (!is_mbpf_load(meta)) 4303 continue; 4304 4305 if (meta->ptr.type != PTR_TO_PACKET || meta->ldst_gather_len) { 4306 cache_avail = false; 4307 continue; 4308 } 4309 4310 if (!cache_avail) { 4311 cache_avail = true; 4312 if (range_node) 4313 goto end_current_then_start_new; 4314 goto start_new; 4315 } 4316 4317 /* Check ID to make sure two reads share the same 4318 * variable offset against PTR_TO_PACKET, and check OFF 4319 * to make sure they also share the same constant 4320 * offset. 4321 * 4322 * OFFs don't really need to be the same, because they 4323 * are the constant offsets against PTR_TO_PACKET, so 4324 * for different OFFs, we could canonicalize them to 4325 * offsets against original packet pointer. We don't 4326 * support this. 4327 */ 4328 if (meta->ptr.id == range_ptr_id && 4329 meta->ptr.off == range_ptr_off) { 4330 s16 new_start = range_start; 4331 s16 end, off = insn->off; 4332 s16 new_end = range_end; 4333 bool changed = false; 4334 4335 if (off < range_start) { 4336 new_start = off; 4337 changed = true; 4338 } 4339 4340 end = off + BPF_LDST_BYTES(insn); 4341 if (end > range_end) { 4342 new_end = end; 4343 changed = true; 4344 } 4345 4346 if (!changed) 4347 continue; 4348 4349 if (new_end - new_start <= 64) { 4350 /* Install new range. */ 4351 range_start = new_start; 4352 range_end = new_end; 4353 continue; 4354 } 4355 } 4356 4357 end_current_then_start_new: 4358 range_node->pkt_cache.range_start = range_start; 4359 range_node->pkt_cache.range_end = range_end; 4360 start_new: 4361 range_node = meta; 4362 range_node->pkt_cache.do_init = true; 4363 range_ptr_id = range_node->ptr.id; 4364 range_ptr_off = range_node->ptr.off; 4365 range_start = insn->off; 4366 range_end = insn->off + BPF_LDST_BYTES(insn); 4367 } 4368 4369 if (range_node) { 4370 range_node->pkt_cache.range_start = range_start; 4371 range_node->pkt_cache.range_end = range_end; 4372 } 4373 4374 list_for_each_entry(meta, &nfp_prog->insns, l) { 4375 if (meta->flags & FLAG_INSN_SKIP_MASK) 4376 continue; 4377 4378 if (is_mbpf_load_pkt(meta) && !meta->ldst_gather_len) { 4379 if (meta->pkt_cache.do_init) { 4380 range_start = meta->pkt_cache.range_start; 4381 range_end = meta->pkt_cache.range_end; 4382 } else { 4383 meta->pkt_cache.range_start = range_start; 4384 meta->pkt_cache.range_end = range_end; 4385 } 4386 } 4387 } 4388 } 4389 4390 static int nfp_bpf_optimize(struct nfp_prog *nfp_prog) 4391 { 4392 nfp_bpf_opt_reg_init(nfp_prog); 4393 4394 nfp_bpf_opt_neg_add_sub(nfp_prog); 4395 nfp_bpf_opt_ld_mask(nfp_prog); 4396 nfp_bpf_opt_ld_shift(nfp_prog); 4397 nfp_bpf_opt_ldst_gather(nfp_prog); 4398 nfp_bpf_opt_pkt_cache(nfp_prog); 4399 4400 return 0; 4401 } 4402 4403 static int nfp_bpf_replace_map_ptrs(struct nfp_prog *nfp_prog) 4404 { 4405 struct nfp_insn_meta *meta1, *meta2; 4406 struct nfp_bpf_map *nfp_map; 4407 struct bpf_map *map; 4408 u32 id; 4409 4410 nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) { 4411 if (meta1->flags & FLAG_INSN_SKIP_MASK || 4412 meta2->flags & FLAG_INSN_SKIP_MASK) 4413 continue; 4414 4415 if (meta1->insn.code != (BPF_LD | BPF_IMM | BPF_DW) || 4416 meta1->insn.src_reg != BPF_PSEUDO_MAP_FD) 4417 continue; 4418 4419 map = (void *)(unsigned long)((u32)meta1->insn.imm | 4420 (u64)meta2->insn.imm << 32); 4421 if (bpf_map_offload_neutral(map)) { 4422 id = map->id; 4423 } else { 4424 nfp_map = map_to_offmap(map)->dev_priv; 4425 id = nfp_map->tid; 4426 } 4427 4428 meta1->insn.imm = id; 4429 meta2->insn.imm = 0; 4430 } 4431 4432 return 0; 4433 } 4434 4435 static int nfp_bpf_ustore_calc(u64 *prog, unsigned int len) 4436 { 4437 __le64 *ustore = (__force __le64 *)prog; 4438 int i; 4439 4440 for (i = 0; i < len; i++) { 4441 int err; 4442 4443 err = nfp_ustore_check_valid_no_ecc(prog[i]); 4444 if (err) 4445 return err; 4446 4447 ustore[i] = cpu_to_le64(nfp_ustore_calc_ecc_insn(prog[i])); 4448 } 4449 4450 return 0; 4451 } 4452 4453 static void nfp_bpf_prog_trim(struct nfp_prog *nfp_prog) 4454 { 4455 void *prog; 4456 4457 prog = kvmalloc_array(nfp_prog->prog_len, sizeof(u64), GFP_KERNEL); 4458 if (!prog) 4459 return; 4460 4461 nfp_prog->__prog_alloc_len = nfp_prog->prog_len * sizeof(u64); 4462 memcpy(prog, nfp_prog->prog, nfp_prog->__prog_alloc_len); 4463 kvfree(nfp_prog->prog); 4464 nfp_prog->prog = prog; 4465 } 4466 4467 int nfp_bpf_jit(struct nfp_prog *nfp_prog) 4468 { 4469 int ret; 4470 4471 ret = nfp_bpf_replace_map_ptrs(nfp_prog); 4472 if (ret) 4473 return ret; 4474 4475 ret = nfp_bpf_optimize(nfp_prog); 4476 if (ret) 4477 return ret; 4478 4479 ret = nfp_translate(nfp_prog); 4480 if (ret) { 4481 pr_err("Translation failed with error %d (translated: %u)\n", 4482 ret, nfp_prog->n_translated); 4483 return -EINVAL; 4484 } 4485 4486 nfp_bpf_prog_trim(nfp_prog); 4487 4488 return ret; 4489 } 4490 4491 void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog) 4492 { 4493 struct nfp_insn_meta *meta; 4494 4495 /* Another pass to record jump information. */ 4496 list_for_each_entry(meta, &nfp_prog->insns, l) { 4497 struct nfp_insn_meta *dst_meta; 4498 u64 code = meta->insn.code; 4499 unsigned int dst_idx; 4500 bool pseudo_call; 4501 4502 if (!is_mbpf_jmp(meta)) 4503 continue; 4504 if (BPF_OP(code) == BPF_EXIT) 4505 continue; 4506 if (is_mbpf_helper_call(meta)) 4507 continue; 4508 4509 /* If opcode is BPF_CALL at this point, this can only be a 4510 * BPF-to-BPF call (a.k.a pseudo call). 4511 */ 4512 pseudo_call = BPF_OP(code) == BPF_CALL; 4513 4514 if (pseudo_call) 4515 dst_idx = meta->n + 1 + meta->insn.imm; 4516 else 4517 dst_idx = meta->n + 1 + meta->insn.off; 4518 4519 dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_idx); 4520 4521 if (pseudo_call) 4522 dst_meta->flags |= FLAG_INSN_IS_SUBPROG_START; 4523 4524 dst_meta->flags |= FLAG_INSN_IS_JUMP_DST; 4525 meta->jmp_dst = dst_meta; 4526 } 4527 } 4528 4529 bool nfp_bpf_supported_opcode(u8 code) 4530 { 4531 return !!instr_cb[code]; 4532 } 4533 4534 void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv) 4535 { 4536 unsigned int i; 4537 u64 *prog; 4538 int err; 4539 4540 prog = kmemdup(nfp_prog->prog, nfp_prog->prog_len * sizeof(u64), 4541 GFP_KERNEL); 4542 if (!prog) 4543 return ERR_PTR(-ENOMEM); 4544 4545 for (i = 0; i < nfp_prog->prog_len; i++) { 4546 enum nfp_relo_type special; 4547 u32 val; 4548 u16 off; 4549 4550 special = FIELD_GET(OP_RELO_TYPE, prog[i]); 4551 switch (special) { 4552 case RELO_NONE: 4553 continue; 4554 case RELO_BR_REL: 4555 br_add_offset(&prog[i], bv->start_off); 4556 break; 4557 case RELO_BR_GO_OUT: 4558 br_set_offset(&prog[i], 4559 nfp_prog->tgt_out + bv->start_off); 4560 break; 4561 case RELO_BR_GO_ABORT: 4562 br_set_offset(&prog[i], 4563 nfp_prog->tgt_abort + bv->start_off); 4564 break; 4565 case RELO_BR_GO_CALL_PUSH_REGS: 4566 if (!nfp_prog->tgt_call_push_regs) { 4567 pr_err("BUG: failed to detect subprogram registers needs\n"); 4568 err = -EINVAL; 4569 goto err_free_prog; 4570 } 4571 off = nfp_prog->tgt_call_push_regs + bv->start_off; 4572 br_set_offset(&prog[i], off); 4573 break; 4574 case RELO_BR_GO_CALL_POP_REGS: 4575 if (!nfp_prog->tgt_call_pop_regs) { 4576 pr_err("BUG: failed to detect subprogram registers needs\n"); 4577 err = -EINVAL; 4578 goto err_free_prog; 4579 } 4580 off = nfp_prog->tgt_call_pop_regs + bv->start_off; 4581 br_set_offset(&prog[i], off); 4582 break; 4583 case RELO_BR_NEXT_PKT: 4584 br_set_offset(&prog[i], bv->tgt_done); 4585 break; 4586 case RELO_BR_HELPER: 4587 val = br_get_offset(prog[i]); 4588 val -= BR_OFF_RELO; 4589 switch (val) { 4590 case BPF_FUNC_map_lookup_elem: 4591 val = nfp_prog->bpf->helpers.map_lookup; 4592 break; 4593 case BPF_FUNC_map_update_elem: 4594 val = nfp_prog->bpf->helpers.map_update; 4595 break; 4596 case BPF_FUNC_map_delete_elem: 4597 val = nfp_prog->bpf->helpers.map_delete; 4598 break; 4599 case BPF_FUNC_perf_event_output: 4600 val = nfp_prog->bpf->helpers.perf_event_output; 4601 break; 4602 default: 4603 pr_err("relocation of unknown helper %d\n", 4604 val); 4605 err = -EINVAL; 4606 goto err_free_prog; 4607 } 4608 br_set_offset(&prog[i], val); 4609 break; 4610 case RELO_IMMED_REL: 4611 immed_add_value(&prog[i], bv->start_off); 4612 break; 4613 } 4614 4615 prog[i] &= ~OP_RELO_TYPE; 4616 } 4617 4618 err = nfp_bpf_ustore_calc(prog, nfp_prog->prog_len); 4619 if (err) 4620 goto err_free_prog; 4621 4622 return prog; 4623 4624 err_free_prog: 4625 kfree(prog); 4626 return ERR_PTR(err); 4627 } 4628