lib/librte_bpf/bpf_exec.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Intel Corporation
   3  */
   4
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <inttypes.h>
  11
  12 #include <rte_common.h>
  13 #include <rte_log.h>
  14 #include <rte_debug.h>
  15 #include <rte_memory.h>
  16 #include <rte_eal.h>
  17 #include <rte_byteorder.h>
  18
  19 #include "bpf_impl.h"
  20
  21 #define BPF_JMP_UNC(ins)        ((ins) += (ins)->off)
  22
  23 #define BPF_JMP_CND_REG(reg, ins, op, type)     \
  24         ((ins) += \
  25                 ((type)(reg)[(ins)->dst_reg] op (type)(reg)[(ins)->src_reg]) ? \
  26                 (ins)->off : 0)
  27
  28 #define BPF_JMP_CND_IMM(reg, ins, op, type)     \
  29         ((ins) += \
  30                 ((type)(reg)[(ins)->dst_reg] op (type)(ins)->imm) ? \
  31                 (ins)->off : 0)
  32
  33 #define BPF_NEG_ALU(reg, ins, type)     \
  34         ((reg)[(ins)->dst_reg] = (type)(-(reg)[(ins)->dst_reg]))
  35
  36 #define EBPF_MOV_ALU_REG(reg, ins, type)        \
  37         ((reg)[(ins)->dst_reg] = (type)(reg)[(ins)->src_reg])
  38
  39 #define BPF_OP_ALU_REG(reg, ins, op, type)      \
  40         ((reg)[(ins)->dst_reg] = \
  41                 (type)(reg)[(ins)->dst_reg] op (type)(reg)[(ins)->src_reg])
  42
  43 #define EBPF_MOV_ALU_IMM(reg, ins, type)        \
  44         ((reg)[(ins)->dst_reg] = (type)(ins)->imm)
  45
  46 #define BPF_OP_ALU_IMM(reg, ins, op, type)      \
  47         ((reg)[(ins)->dst_reg] = \
  48                 (type)(reg)[(ins)->dst_reg] op (type)(ins)->imm)
  49
  50 #define BPF_DIV_ZERO_CHECK(bpf, reg, ins, type) do { \
  51         if ((type)(reg)[(ins)->src_reg] == 0) { \
  52                 RTE_BPF_LOG(ERR, \
  53                         "%s(%p): division by 0 at pc: %#zx;\n", \
  54                         __func__, bpf, \
  55                         (uintptr_t)(ins) - (uintptr_t)(bpf)->prm.ins); \
  56                 return 0; \
  57         } \
  58 } while (0)
  59
  60 #define BPF_LD_REG(reg, ins, type)      \
  61         ((reg)[(ins)->dst_reg] = \
  62                 *(type *)(uintptr_t)((reg)[(ins)->src_reg] + (ins)->off))
  63
  64 #define BPF_ST_IMM(reg, ins, type)      \
  65         (*(type *)(uintptr_t)((reg)[(ins)->dst_reg] + (ins)->off) = \
  66                 (type)(ins)->imm)
  67
  68 #define BPF_ST_REG(reg, ins, type)      \
  69         (*(type *)(uintptr_t)((reg)[(ins)->dst_reg] + (ins)->off) = \
  70                 (type)(reg)[(ins)->src_reg])
  71
  72 #define BPF_ST_XADD_REG(reg, ins, tp)   \
  73         (rte_atomic##tp##_add((rte_atomic##tp##_t *) \
  74                 (uintptr_t)((reg)[(ins)->dst_reg] + (ins)->off), \
  75                 reg[ins->src_reg]))
  76
  77 /* BPF_LD | BPF_ABS/BPF_IND */
  78
  79 #define NOP(x)  (x)
  80
  81 #define BPF_LD_ABS(bpf, reg, ins, type, op) do { \
  82         const type *p = bpf_ld_mbuf(bpf, reg, ins, (ins)->imm, sizeof(type)); \
  83         if (p == NULL)  \
  84                 return 0; \
  85         reg[EBPF_REG_0] = op(p[0]); \
  86 } while (0)
  87
  88 #define BPF_LD_IND(bpf, reg, ins, type, op) do { \
  89         uint32_t ofs = reg[ins->src_reg] + (ins)->imm; \
  90         const type *p = bpf_ld_mbuf(bpf, reg, ins, ofs, sizeof(type)); \
  91         if (p == NULL)  \
  92                 return 0; \
  93         reg[EBPF_REG_0] = op(p[0]); \
  94 } while (0)
  95
  96
  97 static inline void
  98 bpf_alu_be(uint64_t reg[EBPF_REG_NUM], const struct ebpf_insn *ins)
  99 {
 100         uint64_t *v;
 101
 102         v = reg + ins->dst_reg;
 103         switch (ins->imm) {
 104         case 16:
 105                 *v = rte_cpu_to_be_16(*v);
 106                 break;
 107         case 32:
 108                 *v = rte_cpu_to_be_32(*v);
 109                 break;
 110         case 64:
 111                 *v = rte_cpu_to_be_64(*v);
 112                 break;
 113         }
 114 }
 115
 116 static inline void
 117 bpf_alu_le(uint64_t reg[EBPF_REG_NUM], const struct ebpf_insn *ins)
 118 {
 119         uint64_t *v;
 120
 121         v = reg + ins->dst_reg;
 122         switch (ins->imm) {
 123         case 16:
 124                 *v = rte_cpu_to_le_16(*v);
 125                 break;
 126         case 32:
 127                 *v = rte_cpu_to_le_32(*v);
 128                 break;
 129         case 64:
 130                 *v = rte_cpu_to_le_64(*v);
 131                 break;
 132         }
 133 }
 134
 135 static inline const void *
 136 bpf_ld_mbuf(const struct rte_bpf *bpf, uint64_t reg[EBPF_REG_NUM],
 137         const struct ebpf_insn *ins, uint32_t off, uint32_t len)
 138 {
 139         const struct rte_mbuf *mb;
 140         const void *p;
 141
 142         mb = (const struct rte_mbuf *)(uintptr_t)reg[EBPF_REG_6];
 143         p = rte_pktmbuf_read(mb, off, len, reg + EBPF_REG_0);
 144         if (p == NULL)
 145                 RTE_BPF_LOG(DEBUG, "%s(bpf=%p, mbuf=%p, ofs=%u, len=%u): "
 146                         "load beyond packet boundary at pc: %#zx;\n",
 147                         __func__, bpf, mb, off, len,
 148                         (uintptr_t)(ins) - (uintptr_t)(bpf)->prm.ins);
 149         return p;
 150 }
 151
 152 static inline uint64_t
 153 bpf_exec(const struct rte_bpf *bpf, uint64_t reg[EBPF_REG_NUM])
 154 {
 155         const struct ebpf_insn *ins;
 156
 157         for (ins = bpf->prm.ins; ; ins++) {
 158                 switch (ins->code) {
 159                 /* 32 bit ALU IMM operations */
 160                 case (BPF_ALU | BPF_ADD | BPF_K):
 161                         BPF_OP_ALU_IMM(reg, ins, +, uint32_t);
 162                         break;
 163                 case (BPF_ALU | BPF_SUB | BPF_K):
 164                         BPF_OP_ALU_IMM(reg, ins, -, uint32_t);
 165                         break;
 166                 case (BPF_ALU | BPF_AND | BPF_K):
 167                         BPF_OP_ALU_IMM(reg, ins, &, uint32_t);
 168                         break;
 169                 case (BPF_ALU | BPF_OR | BPF_K):
 170                         BPF_OP_ALU_IMM(reg, ins, |, uint32_t);
 171                         break;
 172                 case (BPF_ALU | BPF_LSH | BPF_K):
 173                         BPF_OP_ALU_IMM(reg, ins, <<, uint32_t);
 174                         break;
 175                 case (BPF_ALU | BPF_RSH | BPF_K):
 176                         BPF_OP_ALU_IMM(reg, ins, >>, uint32_t);
 177                         break;
 178                 case (BPF_ALU | BPF_XOR | BPF_K):
 179                         BPF_OP_ALU_IMM(reg, ins, ^, uint32_t);
 180                         break;
 181                 case (BPF_ALU | BPF_MUL | BPF_K):
 182                         BPF_OP_ALU_IMM(reg, ins, *, uint32_t);
 183                         break;
 184                 case (BPF_ALU | BPF_DIV | BPF_K):
 185                         BPF_OP_ALU_IMM(reg, ins, /, uint32_t);
 186                         break;
 187                 case (BPF_ALU | BPF_MOD | BPF_K):
 188                         BPF_OP_ALU_IMM(reg, ins, %, uint32_t);
 189                         break;
 190                 case (BPF_ALU | EBPF_MOV | BPF_K):
 191                         EBPF_MOV_ALU_IMM(reg, ins, uint32_t);
 192                         break;
 193                 /* 32 bit ALU REG operations */
 194                 case (BPF_ALU | BPF_ADD | BPF_X):
 195                         BPF_OP_ALU_REG(reg, ins, +, uint32_t);
 196                         break;
 197                 case (BPF_ALU | BPF_SUB | BPF_X):
 198                         BPF_OP_ALU_REG(reg, ins, -, uint32_t);
 199                         break;
 200                 case (BPF_ALU | BPF_AND | BPF_X):
 201                         BPF_OP_ALU_REG(reg, ins, &, uint32_t);
 202                         break;
 203                 case (BPF_ALU | BPF_OR | BPF_X):
 204                         BPF_OP_ALU_REG(reg, ins, |, uint32_t);
 205                         break;
 206                 case (BPF_ALU | BPF_LSH | BPF_X):
 207                         BPF_OP_ALU_REG(reg, ins, <<, uint32_t);
 208                         break;
 209                 case (BPF_ALU | BPF_RSH | BPF_X):
 210                         BPF_OP_ALU_REG(reg, ins, >>, uint32_t);
 211                         break;
 212                 case (BPF_ALU | BPF_XOR | BPF_X):
 213                         BPF_OP_ALU_REG(reg, ins, ^, uint32_t);
 214                         break;
 215                 case (BPF_ALU | BPF_MUL | BPF_X):
 216                         BPF_OP_ALU_REG(reg, ins, *, uint32_t);
 217                         break;
 218                 case (BPF_ALU | BPF_DIV | BPF_X):
 219                         BPF_DIV_ZERO_CHECK(bpf, reg, ins, uint32_t);
 220                         BPF_OP_ALU_REG(reg, ins, /, uint32_t);
 221                         break;
 222                 case (BPF_ALU | BPF_MOD | BPF_X):
 223                         BPF_DIV_ZERO_CHECK(bpf, reg, ins, uint32_t);
 224                         BPF_OP_ALU_REG(reg, ins, %, uint32_t);
 225                         break;
 226                 case (BPF_ALU | EBPF_MOV | BPF_X):
 227                         EBPF_MOV_ALU_REG(reg, ins, uint32_t);
 228                         break;
 229                 case (BPF_ALU | BPF_NEG):
 230                         BPF_NEG_ALU(reg, ins, uint32_t);
 231                         break;
 232                 case (BPF_ALU | EBPF_END | EBPF_TO_BE):
 233                         bpf_alu_be(reg, ins);
 234                         break;
 235                 case (BPF_ALU | EBPF_END | EBPF_TO_LE):
 236                         bpf_alu_le(reg, ins);
 237                         break;
 238                 /* 64 bit ALU IMM operations */
 239                 case (EBPF_ALU64 | BPF_ADD | BPF_K):
 240                         BPF_OP_ALU_IMM(reg, ins, +, uint64_t);
 241                         break;
 242                 case (EBPF_ALU64 | BPF_SUB | BPF_K):
 243                         BPF_OP_ALU_IMM(reg, ins, -, uint64_t);
 244                         break;
 245                 case (EBPF_ALU64 | BPF_AND | BPF_K):
 246                         BPF_OP_ALU_IMM(reg, ins, &, uint64_t);
 247                         break;
 248                 case (EBPF_ALU64 | BPF_OR | BPF_K):
 249                         BPF_OP_ALU_IMM(reg, ins, |, uint64_t);
 250                         break;
 251                 case (EBPF_ALU64 | BPF_LSH | BPF_K):
 252                         BPF_OP_ALU_IMM(reg, ins, <<, uint64_t);
 253                         break;
 254                 case (EBPF_ALU64 | BPF_RSH | BPF_K):
 255                         BPF_OP_ALU_IMM(reg, ins, >>, uint64_t);
 256                         break;
 257                 case (EBPF_ALU64 | EBPF_ARSH | BPF_K):
 258                         BPF_OP_ALU_IMM(reg, ins, >>, int64_t);
 259                         break;
 260                 case (EBPF_ALU64 | BPF_XOR | BPF_K):
 261                         BPF_OP_ALU_IMM(reg, ins, ^, uint64_t);
 262                         break;
 263                 case (EBPF_ALU64 | BPF_MUL | BPF_K):
 264                         BPF_OP_ALU_IMM(reg, ins, *, uint64_t);
 265                         break;
 266                 case (EBPF_ALU64 | BPF_DIV | BPF_K):
 267                         BPF_OP_ALU_IMM(reg, ins, /, uint64_t);
 268                         break;
 269                 case (EBPF_ALU64 | BPF_MOD | BPF_K):
 270                         BPF_OP_ALU_IMM(reg, ins, %, uint64_t);
 271                         break;
 272                 case (EBPF_ALU64 | EBPF_MOV | BPF_K):
 273                         EBPF_MOV_ALU_IMM(reg, ins, uint64_t);
 274                         break;
 275                 /* 64 bit ALU REG operations */
 276                 case (EBPF_ALU64 | BPF_ADD | BPF_X):
 277                         BPF_OP_ALU_REG(reg, ins, +, uint64_t);
 278                         break;
 279                 case (EBPF_ALU64 | BPF_SUB | BPF_X):
 280                         BPF_OP_ALU_REG(reg, ins, -, uint64_t);
 281                         break;
 282                 case (EBPF_ALU64 | BPF_AND | BPF_X):
 283                         BPF_OP_ALU_REG(reg, ins, &, uint64_t);
 284                         break;
 285                 case (EBPF_ALU64 | BPF_OR | BPF_X):
 286                         BPF_OP_ALU_REG(reg, ins, |, uint64_t);
 287                         break;
 288                 case (EBPF_ALU64 | BPF_LSH | BPF_X):
 289                         BPF_OP_ALU_REG(reg, ins, <<, uint64_t);
 290                         break;
 291                 case (EBPF_ALU64 | BPF_RSH | BPF_X):
 292                         BPF_OP_ALU_REG(reg, ins, >>, uint64_t);
 293                         break;
 294                 case (EBPF_ALU64 | EBPF_ARSH | BPF_X):
 295                         BPF_OP_ALU_REG(reg, ins, >>, int64_t);
 296                         break;
 297                 case (EBPF_ALU64 | BPF_XOR | BPF_X):
 298                         BPF_OP_ALU_REG(reg, ins, ^, uint64_t);
 299                         break;
 300                 case (EBPF_ALU64 | BPF_MUL | BPF_X):
 301                         BPF_OP_ALU_REG(reg, ins, *, uint64_t);
 302                         break;
 303                 case (EBPF_ALU64 | BPF_DIV | BPF_X):
 304                         BPF_DIV_ZERO_CHECK(bpf, reg, ins, uint64_t);
 305                         BPF_OP_ALU_REG(reg, ins, /, uint64_t);
 306                         break;
 307                 case (EBPF_ALU64 | BPF_MOD | BPF_X):
 308                         BPF_DIV_ZERO_CHECK(bpf, reg, ins, uint64_t);
 309                         BPF_OP_ALU_REG(reg, ins, %, uint64_t);
 310                         break;
 311                 case (EBPF_ALU64 | EBPF_MOV | BPF_X):
 312                         EBPF_MOV_ALU_REG(reg, ins, uint64_t);
 313                         break;
 314                 case (EBPF_ALU64 | BPF_NEG):
 315                         BPF_NEG_ALU(reg, ins, uint64_t);
 316                         break;
 317                 /* load instructions */
 318                 case (BPF_LDX | BPF_MEM | BPF_B):
 319                         BPF_LD_REG(reg, ins, uint8_t);
 320                         break;
 321                 case (BPF_LDX | BPF_MEM | BPF_H):
 322                         BPF_LD_REG(reg, ins, uint16_t);
 323                         break;
 324                 case (BPF_LDX | BPF_MEM | BPF_W):
 325                         BPF_LD_REG(reg, ins, uint32_t);
 326                         break;
 327                 case (BPF_LDX | BPF_MEM | EBPF_DW):
 328                         BPF_LD_REG(reg, ins, uint64_t);
 329                         break;
 330                 /* load 64 bit immediate value */
 331                 case (BPF_LD | BPF_IMM | EBPF_DW):
 332                         reg[ins->dst_reg] = (uint32_t)ins[0].imm |
 333                                 (uint64_t)(uint32_t)ins[1].imm << 32;
 334                         ins++;
 335                         break;
 336                 /* load absolute instructions */
 337                 case (BPF_LD | BPF_ABS | BPF_B):
 338                         BPF_LD_ABS(bpf, reg, ins, uint8_t, NOP);
 339                         break;
 340                 case (BPF_LD | BPF_ABS | BPF_H):
 341                         BPF_LD_ABS(bpf, reg, ins, uint16_t, rte_be_to_cpu_16);
 342                         break;
 343                 case (BPF_LD | BPF_ABS | BPF_W):
 344                         BPF_LD_ABS(bpf, reg, ins, uint32_t, rte_be_to_cpu_32);
 345                         break;
 346                 /* load indirect instructions */
 347                 case (BPF_LD | BPF_IND | BPF_B):
 348                         BPF_LD_IND(bpf, reg, ins, uint8_t, NOP);
 349                         break;
 350                 case (BPF_LD | BPF_IND | BPF_H):
 351                         BPF_LD_IND(bpf, reg, ins, uint16_t, rte_be_to_cpu_16);
 352                         break;
 353                 case (BPF_LD | BPF_IND | BPF_W):
 354                         BPF_LD_IND(bpf, reg, ins, uint32_t, rte_be_to_cpu_32);
 355                         break;
 356                 /* store instructions */
 357                 case (BPF_STX | BPF_MEM | BPF_B):
 358                         BPF_ST_REG(reg, ins, uint8_t);
 359                         break;
 360                 case (BPF_STX | BPF_MEM | BPF_H):
 361                         BPF_ST_REG(reg, ins, uint16_t);
 362                         break;
 363                 case (BPF_STX | BPF_MEM | BPF_W):
 364                         BPF_ST_REG(reg, ins, uint32_t);
 365                         break;
 366                 case (BPF_STX | BPF_MEM | EBPF_DW):
 367                         BPF_ST_REG(reg, ins, uint64_t);
 368                         break;
 369                 case (BPF_ST | BPF_MEM | BPF_B):
 370                         BPF_ST_IMM(reg, ins, uint8_t);
 371                         break;
 372                 case (BPF_ST | BPF_MEM | BPF_H):
 373                         BPF_ST_IMM(reg, ins, uint16_t);
 374                         break;
 375                 case (BPF_ST | BPF_MEM | BPF_W):
 376                         BPF_ST_IMM(reg, ins, uint32_t);
 377                         break;
 378                 case (BPF_ST | BPF_MEM | EBPF_DW):
 379                         BPF_ST_IMM(reg, ins, uint64_t);
 380                         break;
 381                 /* atomic add instructions */
 382                 case (BPF_STX | EBPF_XADD | BPF_W):
 383                         BPF_ST_XADD_REG(reg, ins, 32);
 384                         break;
 385                 case (BPF_STX | EBPF_XADD | EBPF_DW):
 386                         BPF_ST_XADD_REG(reg, ins, 64);
 387                         break;
 388                 /* jump instructions */
 389                 case (BPF_JMP | BPF_JA):
 390                         BPF_JMP_UNC(ins);
 391                         break;
 392                 /* jump IMM instructions */
 393                 case (BPF_JMP | BPF_JEQ | BPF_K):
 394                         BPF_JMP_CND_IMM(reg, ins, ==, uint64_t);
 395                         break;
 396                 case (BPF_JMP | EBPF_JNE | BPF_K):
 397                         BPF_JMP_CND_IMM(reg, ins, !=, uint64_t);
 398                         break;
 399                 case (BPF_JMP | BPF_JGT | BPF_K):
 400                         BPF_JMP_CND_IMM(reg, ins, >, uint64_t);
 401                         break;
 402                 case (BPF_JMP | EBPF_JLT | BPF_K):
 403                         BPF_JMP_CND_IMM(reg, ins, <, uint64_t);
 404                         break;
 405                 case (BPF_JMP | BPF_JGE | BPF_K):
 406                         BPF_JMP_CND_IMM(reg, ins, >=, uint64_t);
 407                         break;
 408                 case (BPF_JMP | EBPF_JLE | BPF_K):
 409                         BPF_JMP_CND_IMM(reg, ins, <=, uint64_t);
 410                         break;
 411                 case (BPF_JMP | EBPF_JSGT | BPF_K):
 412                         BPF_JMP_CND_IMM(reg, ins, >, int64_t);
 413                         break;
 414                 case (BPF_JMP | EBPF_JSLT | BPF_K):
 415                         BPF_JMP_CND_IMM(reg, ins, <, int64_t);
 416                         break;
 417                 case (BPF_JMP | EBPF_JSGE | BPF_K):
 418                         BPF_JMP_CND_IMM(reg, ins, >=, int64_t);
 419                         break;
 420                 case (BPF_JMP | EBPF_JSLE | BPF_K):
 421                         BPF_JMP_CND_IMM(reg, ins, <=, int64_t);
 422                         break;
 423                 case (BPF_JMP | BPF_JSET | BPF_K):
 424                         BPF_JMP_CND_IMM(reg, ins, &, uint64_t);
 425                         break;
 426                 /* jump REG instructions */
 427                 case (BPF_JMP | BPF_JEQ | BPF_X):
 428                         BPF_JMP_CND_REG(reg, ins, ==, uint64_t);
 429                         break;
 430                 case (BPF_JMP | EBPF_JNE | BPF_X):
 431                         BPF_JMP_CND_REG(reg, ins, !=, uint64_t);
 432                         break;
 433                 case (BPF_JMP | BPF_JGT | BPF_X):
 434                         BPF_JMP_CND_REG(reg, ins, >, uint64_t);
 435                         break;
 436                 case (BPF_JMP | EBPF_JLT | BPF_X):
 437                         BPF_JMP_CND_REG(reg, ins, <, uint64_t);
 438                         break;
 439                 case (BPF_JMP | BPF_JGE | BPF_X):
 440                         BPF_JMP_CND_REG(reg, ins, >=, uint64_t);
 441                         break;
 442                 case (BPF_JMP | EBPF_JLE | BPF_X):
 443                         BPF_JMP_CND_REG(reg, ins, <=, uint64_t);
 444                         break;
 445                 case (BPF_JMP | EBPF_JSGT | BPF_X):
 446                         BPF_JMP_CND_REG(reg, ins, >, int64_t);
 447                         break;
 448                 case (BPF_JMP | EBPF_JSLT | BPF_X):
 449                         BPF_JMP_CND_REG(reg, ins, <, int64_t);
 450                         break;
 451                 case (BPF_JMP | EBPF_JSGE | BPF_X):
 452                         BPF_JMP_CND_REG(reg, ins, >=, int64_t);
 453                         break;
 454                 case (BPF_JMP | EBPF_JSLE | BPF_X):
 455                         BPF_JMP_CND_REG(reg, ins, <=, int64_t);
 456                         break;
 457                 case (BPF_JMP | BPF_JSET | BPF_X):
 458                         BPF_JMP_CND_REG(reg, ins, &, uint64_t);
 459                         break;
 460                 /* call instructions */
 461                 case (BPF_JMP | EBPF_CALL):
 462                         reg[EBPF_REG_0] = bpf->prm.xsym[ins->imm].func.val(
 463                                 reg[EBPF_REG_1], reg[EBPF_REG_2],
 464                                 reg[EBPF_REG_3], reg[EBPF_REG_4],
 465                                 reg[EBPF_REG_5]);
 466                         break;
 467                 /* return instruction */
 468                 case (BPF_JMP | EBPF_EXIT):
 469                         return reg[EBPF_REG_0];
 470                 default:
 471                         RTE_BPF_LOG(ERR,
 472                                 "%s(%p): invalid opcode %#x at pc: %#zx;\n",
 473                                 __func__, bpf, ins->code,
 474                                 (uintptr_t)ins - (uintptr_t)bpf->prm.ins);
 475                         return 0;
 476                 }
 477         }
 478
 479         /* should never be reached */
 480         RTE_VERIFY(0);
 481         return 0;
 482 }
 483
 484 uint32_t
 485 rte_bpf_exec_burst(const struct rte_bpf *bpf, void *ctx[], uint64_t rc[],
 486         uint32_t num)
 487 {
 488         uint32_t i;
 489         uint64_t reg[EBPF_REG_NUM];
 490         uint64_t stack[MAX_BPF_STACK_SIZE / sizeof(uint64_t)];
 491
 492         for (i = 0; i != num; i++) {
 493
 494                 reg[EBPF_REG_1] = (uintptr_t)ctx[i];
 495                 reg[EBPF_REG_10] = (uintptr_t)(stack + RTE_DIM(stack));
 496
 497                 rc[i] = bpf_exec(bpf, reg);
 498         }
 499
 500         return i;
 501 }
 502
 503 uint64_t
 504 rte_bpf_exec(const struct rte_bpf *bpf, void *ctx)
 505 {
 506         uint64_t rc;
 507
 508         rte_bpf_exec_burst(bpf, &ctx, &rc, 1);
 509         return rc;
 510 }