tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <string.h>
   4
   5 #include "intel-pt-decoder/intel-pt-pkt-decoder.h"
   6
   7 #include "debug.h"
   8 #include "tests/tests.h"
   9 #include "arch-tests.h"
  10
  11 /**
  12  * struct test_data - Test data.
  13  * @len: number of bytes to decode
  14  * @bytes: bytes to decode
  15  * @ctx: packet context to decode
  16  * @packet: expected packet
  17  * @new_ctx: expected new packet context
  18  * @ctx_unchanged: the packet context must not change
  19  */
  20 struct test_data {
  21         int len;
  22         u8 bytes[INTEL_PT_PKT_MAX_SZ];
  23         enum intel_pt_pkt_ctx ctx;
  24         struct intel_pt_pkt packet;
  25         enum intel_pt_pkt_ctx new_ctx;
  26         int ctx_unchanged;
  27 } data[] = {
  28         /* Padding Packet */
  29         {1, {0}, 0, {INTEL_PT_PAD, 0, 0}, 0, 1 },
  30         /* Short Taken/Not Taken Packet */
  31         {1, {4}, 0, {INTEL_PT_TNT, 1, 0}, 0, 0 },
  32         {1, {6}, 0, {INTEL_PT_TNT, 1, 0x20ULL << 58}, 0, 0 },
  33         {1, {0x80}, 0, {INTEL_PT_TNT, 6, 0}, 0, 0 },
  34         {1, {0xfe}, 0, {INTEL_PT_TNT, 6, 0x3fULL << 58}, 0, 0 },
  35         /* Long Taken/Not Taken Packet */
  36         {8, {0x02, 0xa3, 2}, 0, {INTEL_PT_TNT, 1, 0xa302ULL << 47}, 0, 0 },
  37         {8, {0x02, 0xa3, 3}, 0, {INTEL_PT_TNT, 1, 0x1a302ULL << 47}, 0, 0 },
  38         {8, {0x02, 0xa3, 0, 0, 0, 0, 0, 0x80}, 0, {INTEL_PT_TNT, 47, 0xa302ULL << 1}, 0, 0 },
  39         {8, {0x02, 0xa3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, {INTEL_PT_TNT, 47, 0xffffffffffffa302ULL << 1}, 0, 0 },
  40         /* Target IP Packet */
  41         {1, {0x0d}, 0, {INTEL_PT_TIP, 0, 0}, 0, 0 },
  42         {3, {0x2d, 1, 2}, 0, {INTEL_PT_TIP, 1, 0x201}, 0, 0 },
  43         {5, {0x4d, 1, 2, 3, 4}, 0, {INTEL_PT_TIP, 2, 0x4030201}, 0, 0 },
  44         {7, {0x6d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP, 3, 0x60504030201}, 0, 0 },
  45         {7, {0x8d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP, 4, 0x60504030201}, 0, 0 },
  46         {9, {0xcd, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP, 6, 0x807060504030201}, 0, 0 },
  47         /* Packet Generation Enable */
  48         {1, {0x11}, 0, {INTEL_PT_TIP_PGE, 0, 0}, 0, 0 },
  49         {3, {0x31, 1, 2}, 0, {INTEL_PT_TIP_PGE, 1, 0x201}, 0, 0 },
  50         {5, {0x51, 1, 2, 3, 4}, 0, {INTEL_PT_TIP_PGE, 2, 0x4030201}, 0, 0 },
  51         {7, {0x71, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGE, 3, 0x60504030201}, 0, 0 },
  52         {7, {0x91, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGE, 4, 0x60504030201}, 0, 0 },
  53         {9, {0xd1, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP_PGE, 6, 0x807060504030201}, 0, 0 },
  54         /* Packet Generation Disable */
  55         {1, {0x01}, 0, {INTEL_PT_TIP_PGD, 0, 0}, 0, 0 },
  56         {3, {0x21, 1, 2}, 0, {INTEL_PT_TIP_PGD, 1, 0x201}, 0, 0 },
  57         {5, {0x41, 1, 2, 3, 4}, 0, {INTEL_PT_TIP_PGD, 2, 0x4030201}, 0, 0 },
  58         {7, {0x61, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGD, 3, 0x60504030201}, 0, 0 },
  59         {7, {0x81, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGD, 4, 0x60504030201}, 0, 0 },
  60         {9, {0xc1, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP_PGD, 6, 0x807060504030201}, 0, 0 },
  61         /* Flow Update Packet */
  62         {1, {0x1d}, 0, {INTEL_PT_FUP, 0, 0}, 0, 0 },
  63         {3, {0x3d, 1, 2}, 0, {INTEL_PT_FUP, 1, 0x201}, 0, 0 },
  64         {5, {0x5d, 1, 2, 3, 4}, 0, {INTEL_PT_FUP, 2, 0x4030201}, 0, 0 },
  65         {7, {0x7d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_FUP, 3, 0x60504030201}, 0, 0 },
  66         {7, {0x9d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_FUP, 4, 0x60504030201}, 0, 0 },
  67         {9, {0xdd, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_FUP, 6, 0x807060504030201}, 0, 0 },
  68         /* Paging Information Packet */
  69         {8, {0x02, 0x43, 2, 4, 6, 8, 10, 12}, 0, {INTEL_PT_PIP, 0, 0x60504030201}, 0, 0 },
  70         {8, {0x02, 0x43, 3, 4, 6, 8, 10, 12}, 0, {INTEL_PT_PIP, 0, 0x60504030201 | (1ULL << 63)}, 0, 0 },
  71         /* Mode Exec Packet */
  72         {2, {0x99, 0x00}, 0, {INTEL_PT_MODE_EXEC, 0, 16}, 0, 0 },
  73         {2, {0x99, 0x01}, 0, {INTEL_PT_MODE_EXEC, 0, 64}, 0, 0 },
  74         {2, {0x99, 0x02}, 0, {INTEL_PT_MODE_EXEC, 0, 32}, 0, 0 },
  75         /* Mode TSX Packet */
  76         {2, {0x99, 0x20}, 0, {INTEL_PT_MODE_TSX, 0, 0}, 0, 0 },
  77         {2, {0x99, 0x21}, 0, {INTEL_PT_MODE_TSX, 0, 1}, 0, 0 },
  78         {2, {0x99, 0x22}, 0, {INTEL_PT_MODE_TSX, 0, 2}, 0, 0 },
  79         /* Trace Stop Packet */
  80         {2, {0x02, 0x83}, 0, {INTEL_PT_TRACESTOP, 0, 0}, 0, 0 },
  81         /* Core:Bus Ratio Packet */
  82         {4, {0x02, 0x03, 0x12, 0}, 0, {INTEL_PT_CBR, 0, 0x12}, 0, 1 },
  83         /* Timestamp Counter Packet */
  84         {8, {0x19, 1, 2, 3, 4, 5, 6, 7}, 0, {INTEL_PT_TSC, 0, 0x7060504030201}, 0, 1 },
  85         /* Mini Time Counter Packet */
  86         {2, {0x59, 0x12}, 0, {INTEL_PT_MTC, 0, 0x12}, 0, 1 },
  87         /* TSC / MTC Alignment Packet */
  88         {7, {0x02, 0x73}, 0, {INTEL_PT_TMA, 0, 0}, 0, 1 },
  89         {7, {0x02, 0x73, 1, 2}, 0, {INTEL_PT_TMA, 0, 0x201}, 0, 1 },
  90         {7, {0x02, 0x73, 0, 0, 0, 0xff, 1}, 0, {INTEL_PT_TMA, 0x1ff, 0}, 0, 1 },
  91         {7, {0x02, 0x73, 0x80, 0xc0, 0, 0xff, 1}, 0, {INTEL_PT_TMA, 0x1ff, 0xc080}, 0, 1 },
  92         /* Cycle Count Packet */
  93         {1, {0x03}, 0, {INTEL_PT_CYC, 0, 0}, 0, 1 },
  94         {1, {0x0b}, 0, {INTEL_PT_CYC, 0, 1}, 0, 1 },
  95         {1, {0xfb}, 0, {INTEL_PT_CYC, 0, 0x1f}, 0, 1 },
  96         {2, {0x07, 2}, 0, {INTEL_PT_CYC, 0, 0x20}, 0, 1 },
  97         {2, {0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0xfff}, 0, 1 },
  98         {3, {0x07, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x1000}, 0, 1 },
  99         {3, {0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x7ffff}, 0, 1 },
 100         {4, {0x07, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x80000}, 0, 1 },
 101         {4, {0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x3ffffff}, 0, 1 },
 102         {5, {0x07, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x4000000}, 0, 1 },
 103         {5, {0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x1ffffffff}, 0, 1 },
 104         {6, {0x07, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x200000000}, 0, 1 },
 105         {6, {0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0xffffffffff}, 0, 1 },
 106         {7, {0x07, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x10000000000}, 0, 1 },
 107         {7, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x7fffffffffff}, 0, 1 },
 108         {8, {0x07, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x800000000000}, 0, 1 },
 109         {8, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x3fffffffffffff}, 0, 1 },
 110         {9, {0x07, 1, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x40000000000000}, 0, 1 },
 111         {9, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x1fffffffffffffff}, 0, 1 },
 112         {10, {0x07, 1, 1, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x2000000000000000}, 0, 1 },
 113         {10, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe}, 0, {INTEL_PT_CYC, 0, 0xffffffffffffffff}, 0, 1 },
 114         /* Virtual-Machine Control Structure Packet */
 115         {7, {0x02, 0xc8, 1, 2, 3, 4, 5}, 0, {INTEL_PT_VMCS, 5, 0x504030201}, 0, 0 },
 116         /* Overflow Packet */
 117         {2, {0x02, 0xf3}, 0, {INTEL_PT_OVF, 0, 0}, 0, 0 },
 118         {2, {0x02, 0xf3}, INTEL_PT_BLK_4_CTX, {INTEL_PT_OVF, 0, 0}, 0, 0 },
 119         {2, {0x02, 0xf3}, INTEL_PT_BLK_8_CTX, {INTEL_PT_OVF, 0, 0}, 0, 0 },
 120         /* Packet Stream Boundary*/
 121         {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, 0, {INTEL_PT_PSB, 0, 0}, 0, 0 },
 122         {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, INTEL_PT_BLK_4_CTX, {INTEL_PT_PSB, 0, 0}, 0, 0 },
 123         {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, INTEL_PT_BLK_8_CTX, {INTEL_PT_PSB, 0, 0}, 0, 0 },
 124         /* PSB End Packet */
 125         {2, {0x02, 0x23}, 0, {INTEL_PT_PSBEND, 0, 0}, 0, 0 },
 126         /* Maintenance Packet */
 127         {11, {0x02, 0xc3, 0x88, 1, 2, 3, 4, 5, 6, 7}, 0, {INTEL_PT_MNT, 0, 0x7060504030201}, 0, 1 },
 128         /* Write Data to PT Packet */
 129         {6, {0x02, 0x12, 1, 2, 3, 4}, 0, {INTEL_PT_PTWRITE, 0, 0x4030201}, 0, 0 },
 130         {10, {0x02, 0x32, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_PTWRITE, 1, 0x807060504030201}, 0, 0 },
 131         {6, {0x02, 0x92, 1, 2, 3, 4}, 0, {INTEL_PT_PTWRITE_IP, 0, 0x4030201}, 0, 0 },
 132         {10, {0x02, 0xb2, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_PTWRITE_IP, 1, 0x807060504030201}, 0, 0 },
 133         /* Execution Stop Packet */
 134         {2, {0x02, 0x62}, 0, {INTEL_PT_EXSTOP, 0, 0}, 0, 1 },
 135         {2, {0x02, 0xe2}, 0, {INTEL_PT_EXSTOP_IP, 0, 0}, 0, 1 },
 136         /* Monitor Wait Packet */
 137         {10, {0x02, 0xc2}, 0, {INTEL_PT_MWAIT, 0, 0}, 0, 0 },
 138         {10, {0x02, 0xc2, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_MWAIT, 0, 0x807060504030201}, 0, 0 },
 139         {10, {0x02, 0xc2, 0xff, 2, 3, 4, 7, 6, 7, 8}, 0, {INTEL_PT_MWAIT, 0, 0x8070607040302ff}, 0, 0 },
 140         /* Power Entry Packet */
 141         {4, {0x02, 0x22}, 0, {INTEL_PT_PWRE, 0, 0}, 0, 1 },
 142         {4, {0x02, 0x22, 1, 2}, 0, {INTEL_PT_PWRE, 0, 0x0201}, 0, 1 },
 143         {4, {0x02, 0x22, 0x80, 0x34}, 0, {INTEL_PT_PWRE, 0, 0x3480}, 0, 1 },
 144         {4, {0x02, 0x22, 0x00, 0x56}, 0, {INTEL_PT_PWRE, 0, 0x5600}, 0, 1 },
 145         /* Power Exit Packet */
 146         {7, {0x02, 0xa2}, 0, {INTEL_PT_PWRX, 0, 0}, 0, 1 },
 147         {7, {0x02, 0xa2, 1, 2, 3, 4, 5}, 0, {INTEL_PT_PWRX, 0, 0x504030201}, 0, 1 },
 148         {7, {0x02, 0xa2, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, {INTEL_PT_PWRX, 0, 0xffffffffff}, 0, 1 },
 149         /* Block Begin Packet */
 150         {3, {0x02, 0x63, 0x00}, 0, {INTEL_PT_BBP, 0, 0}, INTEL_PT_BLK_8_CTX, 0 },
 151         {3, {0x02, 0x63, 0x80}, 0, {INTEL_PT_BBP, 1, 0}, INTEL_PT_BLK_4_CTX, 0 },
 152         {3, {0x02, 0x63, 0x1f}, 0, {INTEL_PT_BBP, 0, 0x1f}, INTEL_PT_BLK_8_CTX, 0 },
 153         {3, {0x02, 0x63, 0x9f}, 0, {INTEL_PT_BBP, 1, 0x1f}, INTEL_PT_BLK_4_CTX, 0 },
 154         /* 4-byte Block Item Packet */
 155         {5, {0x04}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0, 0}, INTEL_PT_BLK_4_CTX, 0 },
 156         {5, {0xfc}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0x1f, 0}, INTEL_PT_BLK_4_CTX, 0 },
 157         {5, {0x04, 1, 2, 3, 4}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0, 0x04030201}, INTEL_PT_BLK_4_CTX, 0 },
 158         {5, {0xfc, 1, 2, 3, 4}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0x1f, 0x04030201}, INTEL_PT_BLK_4_CTX, 0 },
 159         /* 8-byte Block Item Packet */
 160         {9, {0x04}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0, 0}, INTEL_PT_BLK_8_CTX, 0 },
 161         {9, {0xfc}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0x1f, 0}, INTEL_PT_BLK_8_CTX, 0 },
 162         {9, {0x04, 1, 2, 3, 4, 5, 6, 7, 8}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0, 0x0807060504030201}, INTEL_PT_BLK_8_CTX, 0 },
 163         {9, {0xfc, 1, 2, 3, 4, 5, 6, 7, 8}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0x1f, 0x0807060504030201}, INTEL_PT_BLK_8_CTX, 0 },
 164         /* Block End Packet */
 165         {2, {0x02, 0x33}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BEP, 0, 0}, 0, 0 },
 166         {2, {0x02, 0xb3}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BEP_IP, 0, 0}, 0, 0 },
 167         {2, {0x02, 0x33}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BEP, 0, 0}, 0, 0 },
 168         {2, {0x02, 0xb3}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BEP_IP, 0, 0}, 0, 0 },
 169         /* Terminator */
 170         {0, {0}, 0, {0, 0, 0}, 0, 0 },
 171 };
 172
 173 static int dump_packet(struct intel_pt_pkt *packet, u8 *bytes, int len)
 174 {
 175         char desc[INTEL_PT_PKT_DESC_MAX];
 176         int ret, i;
 177
 178         for (i = 0; i < len; i++)
 179                 pr_debug(" %02x", bytes[i]);
 180         for (; i < INTEL_PT_PKT_MAX_SZ; i++)
 181                 pr_debug("   ");
 182         pr_debug("   ");
 183         ret = intel_pt_pkt_desc(packet, desc, INTEL_PT_PKT_DESC_MAX);
 184         if (ret < 0) {
 185                 pr_debug("intel_pt_pkt_desc failed!\n");
 186                 return TEST_FAIL;
 187         }
 188         pr_debug("%s\n", desc);
 189
 190         return TEST_OK;
 191 }
 192
 193 static void decoding_failed(struct test_data *d)
 194 {
 195         pr_debug("Decoding failed!\n");
 196         pr_debug("Decoding:  ");
 197         dump_packet(&d->packet, d->bytes, d->len);
 198 }
 199
 200 static int fail(struct test_data *d, struct intel_pt_pkt *packet, int len,
 201                 enum intel_pt_pkt_ctx new_ctx)
 202 {
 203         decoding_failed(d);
 204
 205         if (len != d->len)
 206                 pr_debug("Expected length: %d   Decoded length %d\n",
 207                          d->len, len);
 208
 209         if (packet->type != d->packet.type)
 210                 pr_debug("Expected type: %d   Decoded type %d\n",
 211                          d->packet.type, packet->type);
 212
 213         if (packet->count != d->packet.count)
 214                 pr_debug("Expected count: %d   Decoded count %d\n",
 215                          d->packet.count, packet->count);
 216
 217         if (packet->payload != d->packet.payload)
 218                 pr_debug("Expected payload: 0x%llx   Decoded payload 0x%llx\n",
 219                          (unsigned long long)d->packet.payload,
 220                          (unsigned long long)packet->payload);
 221
 222         if (new_ctx != d->new_ctx)
 223                 pr_debug("Expected packet context: %d   Decoded packet context %d\n",
 224                          d->new_ctx, new_ctx);
 225
 226         return TEST_FAIL;
 227 }
 228
 229 static int test_ctx_unchanged(struct test_data *d, struct intel_pt_pkt *packet,
 230                               enum intel_pt_pkt_ctx ctx)
 231 {
 232         enum intel_pt_pkt_ctx old_ctx = ctx;
 233
 234         intel_pt_upd_pkt_ctx(packet, &ctx);
 235
 236         if (ctx != old_ctx) {
 237                 decoding_failed(d);
 238                 pr_debug("Packet context changed!\n");
 239                 return TEST_FAIL;
 240         }
 241
 242         return TEST_OK;
 243 }
 244
 245 static int test_one(struct test_data *d)
 246 {
 247         struct intel_pt_pkt packet;
 248         enum intel_pt_pkt_ctx ctx = d->ctx;
 249         int ret;
 250
 251         memset(&packet, 0xff, sizeof(packet));
 252
 253         /* Decode a packet */
 254         ret = intel_pt_get_packet(d->bytes, d->len, &packet, &ctx);
 255         if (ret < 0 || ret > INTEL_PT_PKT_MAX_SZ) {
 256                 decoding_failed(d);
 257                 pr_debug("intel_pt_get_packet returned %d\n", ret);
 258                 return TEST_FAIL;
 259         }
 260
 261         /* Some packets must always leave the packet context unchanged */
 262         if (d->ctx_unchanged) {
 263                 int err;
 264
 265                 err = test_ctx_unchanged(d, &packet, INTEL_PT_NO_CTX);
 266                 if (err)
 267                         return err;
 268                 err = test_ctx_unchanged(d, &packet, INTEL_PT_BLK_4_CTX);
 269                 if (err)
 270                         return err;
 271                 err = test_ctx_unchanged(d, &packet, INTEL_PT_BLK_8_CTX);
 272                 if (err)
 273                         return err;
 274         }
 275
 276         /* Compare to the expected values */
 277         if (ret != d->len || packet.type != d->packet.type ||
 278             packet.count != d->packet.count ||
 279             packet.payload != d->packet.payload || ctx != d->new_ctx)
 280                 return fail(d, &packet, ret, ctx);
 281
 282         pr_debug("Decoded ok:");
 283         ret = dump_packet(&d->packet, d->bytes, d->len);
 284
 285         return ret;
 286 }
 287
 288 /*
 289  * This test feeds byte sequences to the Intel PT packet decoder and checks the
 290  * results. Changes to the packet context are also checked.
 291  */
 292 int test__intel_pt_pkt_decoder(struct test *test __maybe_unused, int subtest __maybe_unused)
 293 {
 294         struct test_data *d = data;
 295         int ret;
 296
 297         for (d = data; d->len; d++) {
 298                 ret = test_one(d);
 299                 if (ret)
 300                         return ret;
 301         }
 302
 303         return TEST_OK;
 304 }