net/nfc/nci/ntf.c

   1 /*
   2  *  The NFC Controller Interface is the communication protocol between an
   3  *  NFC Controller (NFCC) and a Device Host (DH).
   4  *
   5  *  Copyright (C) 2011 Texas Instruments, Inc.
   6  *
   7  *  Written by Ilan Elias <ilane@ti.com>
   8  *
   9  *  Acknowledgements:
  10  *  This file is based on hci_event.c, which was written
  11  *  by Maxim Krasnyansky.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License version 2
  15  *  as published by the Free Software Foundation
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  */
  27
  28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  29
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/bitops.h>
  33 #include <linux/skbuff.h>
  34
  35 #include "../nfc.h"
  36 #include <net/nfc/nci.h>
  37 #include <net/nfc/nci_core.h>
  38 #include <linux/nfc.h>
  39
  40 /* Handle NCI Notification packets */
  41
  42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
  43                                              struct sk_buff *skb)
  44 {
  45         struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
  46         int i;
  47
  48         pr_debug("num_entries %d\n", ntf->num_entries);
  49
  50         if (ntf->num_entries > NCI_MAX_NUM_CONN)
  51                 ntf->num_entries = NCI_MAX_NUM_CONN;
  52
  53         /* update the credits */
  54         for (i = 0; i < ntf->num_entries; i++) {
  55                 ntf->conn_entries[i].conn_id =
  56                         nci_conn_id(&ntf->conn_entries[i].conn_id);
  57
  58                 pr_debug("entry[%d]: conn_id %d, credits %d\n",
  59                          i, ntf->conn_entries[i].conn_id,
  60                          ntf->conn_entries[i].credits);
  61
  62                 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) {
  63                         /* found static rf connection */
  64                         atomic_add(ntf->conn_entries[i].credits,
  65                                    &ndev->credits_cnt);
  66                 }
  67         }
  68
  69         /* trigger the next tx */
  70         if (!skb_queue_empty(&ndev->tx_q))
  71                 queue_work(ndev->tx_wq, &ndev->tx_work);
  72 }
  73
  74 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
  75                                               struct sk_buff *skb)
  76 {
  77         __u8 status = skb->data[0];
  78
  79         pr_debug("status 0x%x\n", status);
  80
  81         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
  82                 /* Activation failed, so complete the request
  83                    (the state remains the same) */
  84                 nci_req_complete(ndev, status);
  85         }
  86 }
  87
  88 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
  89                                                 struct sk_buff *skb)
  90 {
  91         struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
  92
  93         ntf->conn_id = nci_conn_id(&ntf->conn_id);
  94
  95         pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
  96
  97         /* complete the data exchange transaction, if exists */
  98         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
  99                 nci_data_exchange_complete(ndev, NULL, -EIO);
 100 }
 101
 102 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
 103                         struct rf_tech_specific_params_nfca_poll *nfca_poll,
 104                                                      __u8 *data)
 105 {
 106         nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
 107         data += 2;
 108
 109         nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
 110
 111         pr_debug("sens_res 0x%x, nfcid1_len %d\n",
 112                  nfca_poll->sens_res, nfca_poll->nfcid1_len);
 113
 114         memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
 115         data += nfca_poll->nfcid1_len;
 116
 117         nfca_poll->sel_res_len = *data++;
 118
 119         if (nfca_poll->sel_res_len != 0)
 120                 nfca_poll->sel_res = *data++;
 121
 122         pr_debug("sel_res_len %d, sel_res 0x%x\n",
 123                  nfca_poll->sel_res_len,
 124                  nfca_poll->sel_res);
 125
 126         return data;
 127 }
 128
 129 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 130                         struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
 131                                                      __u8 *data)
 132 {
 133         nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
 134
 135         pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
 136
 137         memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
 138         data += nfcb_poll->sensb_res_len;
 139
 140         return data;
 141 }
 142
 143 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 144                         struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
 145                                                      __u8 *data)
 146 {
 147         nfcf_poll->bit_rate = *data++;
 148         nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
 149
 150         pr_debug("bit_rate %d, sensf_res_len %d\n",
 151                  nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
 152
 153         memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
 154         data += nfcf_poll->sensf_res_len;
 155
 156         return data;
 157 }
 158
 159 static int nci_add_new_protocol(struct nci_dev *ndev,
 160                                 struct nfc_target *target,
 161                                 __u8 rf_protocol,
 162                                 __u8 rf_tech_and_mode,
 163                                 void *params)
 164 {
 165         struct rf_tech_specific_params_nfca_poll *nfca_poll;
 166         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
 167         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
 168         __u32 protocol;
 169
 170         if (rf_protocol == NCI_RF_PROTOCOL_T2T)
 171                 protocol = NFC_PROTO_MIFARE_MASK;
 172         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
 173                 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
 174                         protocol = NFC_PROTO_ISO14443_MASK;
 175                 else
 176                         protocol = NFC_PROTO_ISO14443_B_MASK;
 177         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
 178                 protocol = NFC_PROTO_FELICA_MASK;
 179         else
 180                 protocol = 0;
 181
 182         if (!(protocol & ndev->poll_prots)) {
 183                 pr_err("the target found does not have the desired protocol\n");
 184                 return -EPROTO;
 185         }
 186
 187         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
 188                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
 189
 190                 target->sens_res = nfca_poll->sens_res;
 191                 target->sel_res = nfca_poll->sel_res;
 192                 target->nfcid1_len = nfca_poll->nfcid1_len;
 193                 if (target->nfcid1_len > 0) {
 194                         memcpy(target->nfcid1, nfca_poll->nfcid1,
 195                                target->nfcid1_len);
 196                 }
 197         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
 198                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
 199
 200                 target->sensb_res_len = nfcb_poll->sensb_res_len;
 201                 if (target->sensb_res_len > 0) {
 202                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
 203                                target->sensb_res_len);
 204                 }
 205         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
 206                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
 207
 208                 target->sensf_res_len = nfcf_poll->sensf_res_len;
 209                 if (target->sensf_res_len > 0) {
 210                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
 211                                target->sensf_res_len);
 212                 }
 213         } else {
 214                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
 215                 return -EPROTO;
 216         }
 217
 218         target->supported_protocols |= protocol;
 219
 220         pr_debug("protocol 0x%x\n", protocol);
 221
 222         return 0;
 223 }
 224
 225 static void nci_add_new_target(struct nci_dev *ndev,
 226                                struct nci_rf_discover_ntf *ntf)
 227 {
 228         struct nfc_target *target;
 229         int i, rc;
 230
 231         for (i = 0; i < ndev->n_targets; i++) {
 232                 target = &ndev->targets[i];
 233                 if (target->logical_idx == ntf->rf_discovery_id) {
 234                         /* This target already exists, add the new protocol */
 235                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 236                                              ntf->rf_tech_and_mode,
 237                                              &ntf->rf_tech_specific_params);
 238                         return;
 239                 }
 240         }
 241
 242         /* This is a new target, check if we've enough room */
 243         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
 244                 pr_debug("not enough room, ignoring new target...\n");
 245                 return;
 246         }
 247
 248         target = &ndev->targets[ndev->n_targets];
 249
 250         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 251                                   ntf->rf_tech_and_mode,
 252                                   &ntf->rf_tech_specific_params);
 253         if (!rc) {
 254                 target->logical_idx = ntf->rf_discovery_id;
 255                 ndev->n_targets++;
 256
 257                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
 258                          ndev->n_targets);
 259         }
 260 }
 261
 262 void nci_clear_target_list(struct nci_dev *ndev)
 263 {
 264         memset(ndev->targets, 0,
 265                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
 266
 267         ndev->n_targets = 0;
 268 }
 269
 270 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 271                                        struct sk_buff *skb)
 272 {
 273         struct nci_rf_discover_ntf ntf;
 274         __u8 *data = skb->data;
 275         bool add_target = true;
 276
 277         ntf.rf_discovery_id = *data++;
 278         ntf.rf_protocol = *data++;
 279         ntf.rf_tech_and_mode = *data++;
 280         ntf.rf_tech_specific_params_len = *data++;
 281
 282         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 283         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 284         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
 285         pr_debug("rf_tech_specific_params_len %d\n",
 286                  ntf.rf_tech_specific_params_len);
 287
 288         if (ntf.rf_tech_specific_params_len > 0) {
 289                 switch (ntf.rf_tech_and_mode) {
 290                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 291                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 292                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 293                         break;
 294
 295                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 296                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 297                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 298                         break;
 299
 300                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 301                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 302                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 303                         break;
 304
 305                 default:
 306                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
 307                                ntf.rf_tech_and_mode);
 308                         data += ntf.rf_tech_specific_params_len;
 309                         add_target = false;
 310                 }
 311         }
 312
 313         ntf.ntf_type = *data++;
 314         pr_debug("ntf_type %d\n", ntf.ntf_type);
 315
 316         if (add_target == true)
 317                 nci_add_new_target(ndev, &ntf);
 318
 319         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
 320                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
 321         } else {
 322                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
 323                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
 324                                   ndev->n_targets);
 325         }
 326 }
 327
 328 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 329                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 330 {
 331         struct activation_params_nfca_poll_iso_dep *nfca_poll;
 332         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
 333
 334         switch (ntf->activation_rf_tech_and_mode) {
 335         case NCI_NFC_A_PASSIVE_POLL_MODE:
 336                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
 337                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
 338                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
 339                 if (nfca_poll->rats_res_len > 0) {
 340                         memcpy(nfca_poll->rats_res,
 341                                data, nfca_poll->rats_res_len);
 342                 }
 343                 break;
 344
 345         case NCI_NFC_B_PASSIVE_POLL_MODE:
 346                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
 347                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
 348                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
 349                 if (nfcb_poll->attrib_res_len > 0) {
 350                         memcpy(nfcb_poll->attrib_res,
 351                                data, nfcb_poll->attrib_res_len);
 352                 }
 353                 break;
 354
 355         default:
 356                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 357                        ntf->activation_rf_tech_and_mode);
 358                 return NCI_STATUS_RF_PROTOCOL_ERROR;
 359         }
 360
 361         return NCI_STATUS_OK;
 362 }
 363
 364 static void nci_target_auto_activated(struct nci_dev *ndev,
 365                                       struct nci_rf_intf_activated_ntf *ntf)
 366 {
 367         struct nfc_target *target;
 368         int rc;
 369
 370         target = &ndev->targets[ndev->n_targets];
 371
 372         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
 373                                   ntf->activation_rf_tech_and_mode,
 374                                   &ntf->rf_tech_specific_params);
 375         if (rc)
 376                 return;
 377
 378         target->logical_idx = ntf->rf_discovery_id;
 379         ndev->n_targets++;
 380
 381         pr_debug("logical idx %d, n_targets %d\n",
 382                  target->logical_idx, ndev->n_targets);
 383
 384         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 385 }
 386
 387 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 388                                              struct sk_buff *skb)
 389 {
 390         struct nci_rf_intf_activated_ntf ntf;
 391         __u8 *data = skb->data;
 392         int err = NCI_STATUS_OK;
 393
 394         ntf.rf_discovery_id = *data++;
 395         ntf.rf_interface = *data++;
 396         ntf.rf_protocol = *data++;
 397         ntf.activation_rf_tech_and_mode = *data++;
 398         ntf.max_data_pkt_payload_size = *data++;
 399         ntf.initial_num_credits = *data++;
 400         ntf.rf_tech_specific_params_len = *data++;
 401
 402         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
 403         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
 404         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
 405         pr_debug("activation_rf_tech_and_mode 0x%x\n",
 406                  ntf.activation_rf_tech_and_mode);
 407         pr_debug("max_data_pkt_payload_size 0x%x\n",
 408                  ntf.max_data_pkt_payload_size);
 409         pr_debug("initial_num_credits 0x%x\n",
 410                  ntf.initial_num_credits);
 411         pr_debug("rf_tech_specific_params_len %d\n",
 412                  ntf.rf_tech_specific_params_len);
 413
 414         if (ntf.rf_tech_specific_params_len > 0) {
 415                 switch (ntf.activation_rf_tech_and_mode) {
 416                 case NCI_NFC_A_PASSIVE_POLL_MODE:
 417                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
 418                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
 419                         break;
 420
 421                 case NCI_NFC_B_PASSIVE_POLL_MODE:
 422                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
 423                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
 424                         break;
 425
 426                 case NCI_NFC_F_PASSIVE_POLL_MODE:
 427                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
 428                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
 429                         break;
 430
 431                 default:
 432                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 433                                ntf.activation_rf_tech_and_mode);
 434                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 435                         goto exit;
 436                 }
 437         }
 438
 439         ntf.data_exch_rf_tech_and_mode = *data++;
 440         ntf.data_exch_tx_bit_rate = *data++;
 441         ntf.data_exch_rx_bit_rate = *data++;
 442         ntf.activation_params_len = *data++;
 443
 444         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
 445                  ntf.data_exch_rf_tech_and_mode);
 446         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
 447         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
 448         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
 449
 450         if (ntf.activation_params_len > 0) {
 451                 switch (ntf.rf_interface) {
 452                 case NCI_RF_INTERFACE_ISO_DEP:
 453                         err = nci_extract_activation_params_iso_dep(ndev,
 454                                                                     &ntf, data);
 455                         break;
 456
 457                 case NCI_RF_INTERFACE_FRAME:
 458                         /* no activation params */
 459                         break;
 460
 461                 default:
 462                         pr_err("unsupported rf_interface 0x%x\n",
 463                                ntf.rf_interface);
 464                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
 465                         break;
 466                 }
 467         }
 468
 469 exit:
 470         if (err == NCI_STATUS_OK) {
 471                 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
 472                 ndev->initial_num_credits = ntf.initial_num_credits;
 473
 474                 /* set the available credits to initial value */
 475                 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
 476         }
 477
 478         if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
 479                 /* A single target was found and activated automatically */
 480                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 481                 if (err == NCI_STATUS_OK)
 482                         nci_target_auto_activated(ndev, &ntf);
 483         } else {        /* ndev->state == NCI_W4_HOST_SELECT */
 484                 /* A selected target was activated, so complete the request */
 485                 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
 486                 nci_req_complete(ndev, err);
 487         }
 488 }
 489
 490 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 491                                          struct sk_buff *skb)
 492 {
 493         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
 494
 495         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 496
 497         /* drop tx data queue */
 498         skb_queue_purge(&ndev->tx_q);
 499
 500         /* drop partial rx data packet */
 501         if (ndev->rx_data_reassembly) {
 502                 kfree_skb(ndev->rx_data_reassembly);
 503                 ndev->rx_data_reassembly = NULL;
 504         }
 505
 506         /* complete the data exchange transaction, if exists */
 507         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 508                 nci_data_exchange_complete(ndev, NULL, -EIO);
 509
 510         nci_clear_target_list(ndev);
 511         atomic_set(&ndev->state, NCI_IDLE);
 512         nci_req_complete(ndev, NCI_STATUS_OK);
 513 }
 514
 515 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 516 {
 517         __u16 ntf_opcode = nci_opcode(skb->data);
 518
 519         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
 520                  nci_pbf(skb->data),
 521                  nci_opcode_gid(ntf_opcode),
 522                  nci_opcode_oid(ntf_opcode),
 523                  nci_plen(skb->data));
 524
 525         /* strip the nci control header */
 526         skb_pull(skb, NCI_CTRL_HDR_SIZE);
 527
 528         switch (ntf_opcode) {
 529         case NCI_OP_CORE_CONN_CREDITS_NTF:
 530                 nci_core_conn_credits_ntf_packet(ndev, skb);
 531                 break;
 532
 533         case NCI_OP_CORE_GENERIC_ERROR_NTF:
 534                 nci_core_generic_error_ntf_packet(ndev, skb);
 535                 break;
 536
 537         case NCI_OP_CORE_INTF_ERROR_NTF:
 538                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
 539                 break;
 540
 541         case NCI_OP_RF_DISCOVER_NTF:
 542                 nci_rf_discover_ntf_packet(ndev, skb);
 543                 break;
 544
 545         case NCI_OP_RF_INTF_ACTIVATED_NTF:
 546                 nci_rf_intf_activated_ntf_packet(ndev, skb);
 547                 break;
 548
 549         case NCI_OP_RF_DEACTIVATE_NTF:
 550                 nci_rf_deactivate_ntf_packet(ndev, skb);
 551                 break;
 552
 553         default:
 554                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
 555                 break;
 556         }
 557
 558         kfree_skb(skb);
 559 }