drivers/net/thunderbolt.c

   1 /*
   2  * Networking over Thunderbolt cable using Apple ThunderboltIP protocol
   3  *
   4  * Copyright (C) 2017, Intel Corporation
   5  * Authors: Amir Levy <amir.jer.levy@intel.com>
   6  *          Michael Jamet <michael.jamet@intel.com>
   7  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/atomic.h>
  15 #include <linux/highmem.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/jhash.h>
  18 #include <linux/module.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/sizes.h>
  22 #include <linux/thunderbolt.h>
  23 #include <linux/uuid.h>
  24 #include <linux/workqueue.h>
  25
  26 #include <net/ip6_checksum.h>
  27
  28 /* Protocol timeouts in ms */
  29 #define TBNET_LOGIN_DELAY       4500
  30 #define TBNET_LOGIN_TIMEOUT     500
  31 #define TBNET_LOGOUT_TIMEOUT    100
  32
  33 #define TBNET_RING_SIZE         256
  34 #define TBNET_LOCAL_PATH        0xf
  35 #define TBNET_LOGIN_RETRIES     60
  36 #define TBNET_LOGOUT_RETRIES    5
  37 #define TBNET_MATCH_FRAGS_ID    BIT(1)
  38 #define TBNET_MAX_MTU           SZ_64K
  39 #define TBNET_FRAME_SIZE        SZ_4K
  40 #define TBNET_MAX_PAYLOAD_SIZE  \
  41         (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header))
  42 /* Rx packets need to hold space for skb_shared_info */
  43 #define TBNET_RX_MAX_SIZE       \
  44         (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
  45 #define TBNET_RX_PAGE_ORDER     get_order(TBNET_RX_MAX_SIZE)
  46 #define TBNET_RX_PAGE_SIZE      (PAGE_SIZE << TBNET_RX_PAGE_ORDER)
  47
  48 #define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0))
  49
  50 /**
  51  * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame
  52  * @frame_size: size of the data with the frame
  53  * @frame_index: running index on the frames
  54  * @frame_id: ID of the frame to match frames to specific packet
  55  * @frame_count: how many frames assembles a full packet
  56  *
  57  * Each data frame passed to the high-speed DMA ring has this header. If
  58  * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is
  59  * supported then @frame_id is filled, otherwise it stays %0.
  60  */
  61 struct thunderbolt_ip_frame_header {
  62         u32 frame_size;
  63         u16 frame_index;
  64         u16 frame_id;
  65         u32 frame_count;
  66 };
  67
  68 enum thunderbolt_ip_frame_pdf {
  69         TBIP_PDF_FRAME_START = 1,
  70         TBIP_PDF_FRAME_END,
  71 };
  72
  73 enum thunderbolt_ip_type {
  74         TBIP_LOGIN,
  75         TBIP_LOGIN_RESPONSE,
  76         TBIP_LOGOUT,
  77         TBIP_STATUS,
  78 };
  79
  80 struct thunderbolt_ip_header {
  81         u32 route_hi;
  82         u32 route_lo;
  83         u32 length_sn;
  84         uuid_t uuid;
  85         uuid_t initiator_uuid;
  86         uuid_t target_uuid;
  87         u32 type;
  88         u32 command_id;
  89 };
  90
  91 #define TBIP_HDR_LENGTH_MASK            GENMASK(5, 0)
  92 #define TBIP_HDR_SN_MASK                GENMASK(28, 27)
  93 #define TBIP_HDR_SN_SHIFT               27
  94
  95 struct thunderbolt_ip_login {
  96         struct thunderbolt_ip_header hdr;
  97         u32 proto_version;
  98         u32 transmit_path;
  99         u32 reserved[4];
 100 };
 101
 102 #define TBIP_LOGIN_PROTO_VERSION        1
 103
 104 struct thunderbolt_ip_login_response {
 105         struct thunderbolt_ip_header hdr;
 106         u32 status;
 107         u32 receiver_mac[2];
 108         u32 receiver_mac_len;
 109         u32 reserved[4];
 110 };
 111
 112 struct thunderbolt_ip_logout {
 113         struct thunderbolt_ip_header hdr;
 114 };
 115
 116 struct thunderbolt_ip_status {
 117         struct thunderbolt_ip_header hdr;
 118         u32 status;
 119 };
 120
 121 struct tbnet_stats {
 122         u64 tx_packets;
 123         u64 rx_packets;
 124         u64 tx_bytes;
 125         u64 rx_bytes;
 126         u64 rx_errors;
 127         u64 tx_errors;
 128         u64 rx_length_errors;
 129         u64 rx_over_errors;
 130         u64 rx_crc_errors;
 131         u64 rx_missed_errors;
 132 };
 133
 134 struct tbnet_frame {
 135         struct net_device *dev;
 136         struct page *page;
 137         struct ring_frame frame;
 138 };
 139
 140 struct tbnet_ring {
 141         struct tbnet_frame frames[TBNET_RING_SIZE];
 142         unsigned int cons;
 143         unsigned int prod;
 144         struct tb_ring *ring;
 145 };
 146
 147 /**
 148  * struct tbnet - ThunderboltIP network driver private data
 149  * @svc: XDomain service the driver is bound to
 150  * @xd: XDomain the service blongs to
 151  * @handler: ThunderboltIP configuration protocol handler
 152  * @dev: Networking device
 153  * @napi: NAPI structure for Rx polling
 154  * @stats: Network statistics
 155  * @skb: Network packet that is currently processed on Rx path
 156  * @command_id: ID used for next configuration protocol packet
 157  * @login_sent: ThunderboltIP login message successfully sent
 158  * @login_received: ThunderboltIP login message received from the remote
 159  *                  host
 160  * @transmit_path: HopID the other end needs to use building the
 161  *                 opposite side path.
 162  * @connection_lock: Lock serializing access to @login_sent,
 163  *                   @login_received and @transmit_path.
 164  * @login_retries: Number of login retries currently done
 165  * @login_work: Worker to send ThunderboltIP login packets
 166  * @connected_work: Worker that finalizes the ThunderboltIP connection
 167  *                  setup and enables DMA paths for high speed data
 168  *                  transfers
 169  * @disconnect_work: Worker that handles tearing down the ThunderboltIP
 170  *                   connection
 171  * @rx_hdr: Copy of the currently processed Rx frame. Used when a
 172  *          network packet consists of multiple Thunderbolt frames.
 173  *          In host byte order.
 174  * @rx_ring: Software ring holding Rx frames
 175  * @frame_id: Frame ID use for next Tx packet
 176  *            (if %TBNET_MATCH_FRAGS_ID is supported in both ends)
 177  * @tx_ring: Software ring holding Tx frames
 178  */
 179 struct tbnet {
 180         const struct tb_service *svc;
 181         struct tb_xdomain *xd;
 182         struct tb_protocol_handler handler;
 183         struct net_device *dev;
 184         struct napi_struct napi;
 185         struct tbnet_stats stats;
 186         struct sk_buff *skb;
 187         atomic_t command_id;
 188         bool login_sent;
 189         bool login_received;
 190         u32 transmit_path;
 191         struct mutex connection_lock;
 192         int login_retries;
 193         struct delayed_work login_work;
 194         struct work_struct connected_work;
 195         struct work_struct disconnect_work;
 196         struct thunderbolt_ip_frame_header rx_hdr;
 197         struct tbnet_ring rx_ring;
 198         atomic_t frame_id;
 199         struct tbnet_ring tx_ring;
 200 };
 201
 202 /* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */
 203 static const uuid_t tbnet_dir_uuid =
 204         UUID_INIT(0xc66189ca, 0x1cce, 0x4195,
 205                   0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f);
 206
 207 /* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */
 208 static const uuid_t tbnet_svc_uuid =
 209         UUID_INIT(0x798f589e, 0x3616, 0x8a47,
 210                   0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd);
 211
 212 static struct tb_property_dir *tbnet_dir;
 213
 214 static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route,
 215         u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid,
 216         enum thunderbolt_ip_type type, size_t size, u32 command_id)
 217 {
 218         u32 length_sn;
 219
 220         /* Length does not include route_hi/lo and length_sn fields */
 221         length_sn = (size - 3 * 4) / 4;
 222         length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK;
 223
 224         hdr->route_hi = upper_32_bits(route);
 225         hdr->route_lo = lower_32_bits(route);
 226         hdr->length_sn = length_sn;
 227         uuid_copy(&hdr->uuid, &tbnet_svc_uuid);
 228         uuid_copy(&hdr->initiator_uuid, initiator_uuid);
 229         uuid_copy(&hdr->target_uuid, target_uuid);
 230         hdr->type = type;
 231         hdr->command_id = command_id;
 232 }
 233
 234 static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence,
 235                                 u32 command_id)
 236 {
 237         struct thunderbolt_ip_login_response reply;
 238         struct tb_xdomain *xd = net->xd;
 239
 240         memset(&reply, 0, sizeof(reply));
 241         tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,
 242                           xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply),
 243                           command_id);
 244         memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN);
 245         reply.receiver_mac_len = ETH_ALEN;
 246
 247         return tb_xdomain_response(xd, &reply, sizeof(reply),
 248                                    TB_CFG_PKG_XDOMAIN_RESP);
 249 }
 250
 251 static int tbnet_login_request(struct tbnet *net, u8 sequence)
 252 {
 253         struct thunderbolt_ip_login_response reply;
 254         struct thunderbolt_ip_login request;
 255         struct tb_xdomain *xd = net->xd;
 256
 257         memset(&request, 0, sizeof(request));
 258         tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid,
 259                           xd->remote_uuid, TBIP_LOGIN, sizeof(request),
 260                           atomic_inc_return(&net->command_id));
 261
 262         request.proto_version = TBIP_LOGIN_PROTO_VERSION;
 263         request.transmit_path = TBNET_LOCAL_PATH;
 264
 265         return tb_xdomain_request(xd, &request, sizeof(request),
 266                                   TB_CFG_PKG_XDOMAIN_RESP, &reply,
 267                                   sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,
 268                                   TBNET_LOGIN_TIMEOUT);
 269 }
 270
 271 static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence,
 272                                  u32 command_id)
 273 {
 274         struct thunderbolt_ip_status reply;
 275         struct tb_xdomain *xd = net->xd;
 276
 277         memset(&reply, 0, sizeof(reply));
 278         tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,
 279                           xd->remote_uuid, TBIP_STATUS, sizeof(reply),
 280                           atomic_inc_return(&net->command_id));
 281         return tb_xdomain_response(xd, &reply, sizeof(reply),
 282                                    TB_CFG_PKG_XDOMAIN_RESP);
 283 }
 284
 285 static int tbnet_logout_request(struct tbnet *net)
 286 {
 287         struct thunderbolt_ip_logout request;
 288         struct thunderbolt_ip_status reply;
 289         struct tb_xdomain *xd = net->xd;
 290
 291         memset(&request, 0, sizeof(request));
 292         tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid,
 293                           xd->remote_uuid, TBIP_LOGOUT, sizeof(request),
 294                           atomic_inc_return(&net->command_id));
 295
 296         return tb_xdomain_request(xd, &request, sizeof(request),
 297                                   TB_CFG_PKG_XDOMAIN_RESP, &reply,
 298                                   sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,
 299                                   TBNET_LOGOUT_TIMEOUT);
 300 }
 301
 302 static void start_login(struct tbnet *net)
 303 {
 304         mutex_lock(&net->connection_lock);
 305         net->login_sent = false;
 306         net->login_received = false;
 307         mutex_unlock(&net->connection_lock);
 308
 309         queue_delayed_work(system_long_wq, &net->login_work,
 310                            msecs_to_jiffies(1000));
 311 }
 312
 313 static void stop_login(struct tbnet *net)
 314 {
 315         cancel_delayed_work_sync(&net->login_work);
 316         cancel_work_sync(&net->connected_work);
 317 }
 318
 319 static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf)
 320 {
 321         return tf->frame.size ? : TBNET_FRAME_SIZE;
 322 }
 323
 324 static void tbnet_free_buffers(struct tbnet_ring *ring)
 325 {
 326         unsigned int i;
 327
 328         for (i = 0; i < TBNET_RING_SIZE; i++) {
 329                 struct device *dma_dev = tb_ring_dma_device(ring->ring);
 330                 struct tbnet_frame *tf = &ring->frames[i];
 331                 enum dma_data_direction dir;
 332                 unsigned int order;
 333                 size_t size;
 334
 335                 if (!tf->page)
 336                         continue;
 337
 338                 if (ring->ring->is_tx) {
 339                         dir = DMA_TO_DEVICE;
 340                         order = 0;
 341                         size = TBNET_FRAME_SIZE;
 342                 } else {
 343                         dir = DMA_FROM_DEVICE;
 344                         order = TBNET_RX_PAGE_ORDER;
 345                         size = TBNET_RX_PAGE_SIZE;
 346                 }
 347
 348                 if (tf->frame.buffer_phy)
 349                         dma_unmap_page(dma_dev, tf->frame.buffer_phy, size,
 350                                        dir);
 351
 352                 __free_pages(tf->page, order);
 353                 tf->page = NULL;
 354         }
 355
 356         ring->cons = 0;
 357         ring->prod = 0;
 358 }
 359
 360 static void tbnet_tear_down(struct tbnet *net, bool send_logout)
 361 {
 362         netif_carrier_off(net->dev);
 363         netif_stop_queue(net->dev);
 364
 365         stop_login(net);
 366
 367         mutex_lock(&net->connection_lock);
 368
 369         if (net->login_sent && net->login_received) {
 370                 int retries = TBNET_LOGOUT_RETRIES;
 371
 372                 while (send_logout && retries-- > 0) {
 373                         int ret = tbnet_logout_request(net);
 374                         if (ret != -ETIMEDOUT)
 375                                 break;
 376                 }
 377
 378                 tb_ring_stop(net->rx_ring.ring);
 379                 tb_ring_stop(net->tx_ring.ring);
 380                 tbnet_free_buffers(&net->rx_ring);
 381                 tbnet_free_buffers(&net->tx_ring);
 382
 383                 if (tb_xdomain_disable_paths(net->xd))
 384                         netdev_warn(net->dev, "failed to disable DMA paths\n");
 385         }
 386
 387         net->login_retries = 0;
 388         net->login_sent = false;
 389         net->login_received = false;
 390
 391         mutex_unlock(&net->connection_lock);
 392 }
 393
 394 static int tbnet_handle_packet(const void *buf, size_t size, void *data)
 395 {
 396         const struct thunderbolt_ip_login *pkg = buf;
 397         struct tbnet *net = data;
 398         u32 command_id;
 399         int ret = 0;
 400         u32 sequence;
 401         u64 route;
 402
 403         /* Make sure the packet is for us */
 404         if (size < sizeof(struct thunderbolt_ip_header))
 405                 return 0;
 406         if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid))
 407                 return 0;
 408         if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid))
 409                 return 0;
 410
 411         route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo;
 412         route &= ~BIT_ULL(63);
 413         if (route != net->xd->route)
 414                 return 0;
 415
 416         sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK;
 417         sequence >>= TBIP_HDR_SN_SHIFT;
 418         command_id = pkg->hdr.command_id;
 419
 420         switch (pkg->hdr.type) {
 421         case TBIP_LOGIN:
 422                 if (!netif_running(net->dev))
 423                         break;
 424
 425                 ret = tbnet_login_response(net, route, sequence,
 426                                            pkg->hdr.command_id);
 427                 if (!ret) {
 428                         mutex_lock(&net->connection_lock);
 429                         net->login_received = true;
 430                         net->transmit_path = pkg->transmit_path;
 431
 432                         /* If we reached the number of max retries or
 433                          * previous logout, schedule another round of
 434                          * login retries
 435                          */
 436                         if (net->login_retries >= TBNET_LOGIN_RETRIES ||
 437                             !net->login_sent) {
 438                                 net->login_retries = 0;
 439                                 queue_delayed_work(system_long_wq,
 440                                                    &net->login_work, 0);
 441                         }
 442                         mutex_unlock(&net->connection_lock);
 443
 444                         queue_work(system_long_wq, &net->connected_work);
 445                 }
 446                 break;
 447
 448         case TBIP_LOGOUT:
 449                 ret = tbnet_logout_response(net, route, sequence, command_id);
 450                 if (!ret)
 451                         queue_work(system_long_wq, &net->disconnect_work);
 452                 break;
 453
 454         default:
 455                 return 0;
 456         }
 457
 458         if (ret)
 459                 netdev_warn(net->dev, "failed to send ThunderboltIP response\n");
 460
 461         return 1;
 462 }
 463
 464 static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring)
 465 {
 466         return ring->prod - ring->cons;
 467 }
 468
 469 static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers)
 470 {
 471         struct tbnet_ring *ring = &net->rx_ring;
 472         int ret;
 473
 474         while (nbuffers--) {
 475                 struct device *dma_dev = tb_ring_dma_device(ring->ring);
 476                 unsigned int index = ring->prod & (TBNET_RING_SIZE - 1);
 477                 struct tbnet_frame *tf = &ring->frames[index];
 478                 dma_addr_t dma_addr;
 479
 480                 if (tf->page)
 481                         break;
 482
 483                 /* Allocate page (order > 0) so that it can hold maximum
 484                  * ThunderboltIP frame (4kB) and the additional room for
 485                  * SKB shared info required by build_skb().
 486                  */
 487                 tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER);
 488                 if (!tf->page) {
 489                         ret = -ENOMEM;
 490                         goto err_free;
 491                 }
 492
 493                 dma_addr = dma_map_page(dma_dev, tf->page, 0,
 494                                         TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);
 495                 if (dma_mapping_error(dma_dev, dma_addr)) {
 496                         ret = -ENOMEM;
 497                         goto err_free;
 498                 }
 499
 500                 tf->frame.buffer_phy = dma_addr;
 501                 tf->dev = net->dev;
 502
 503                 tb_ring_rx(ring->ring, &tf->frame);
 504
 505                 ring->prod++;
 506         }
 507
 508         return 0;
 509
 510 err_free:
 511         tbnet_free_buffers(ring);
 512         return ret;
 513 }
 514
 515 static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net)
 516 {
 517         struct tbnet_ring *ring = &net->tx_ring;
 518         struct device *dma_dev = tb_ring_dma_device(ring->ring);
 519         struct tbnet_frame *tf;
 520         unsigned int index;
 521
 522         if (!tbnet_available_buffers(ring))
 523                 return NULL;
 524
 525         index = ring->cons++ & (TBNET_RING_SIZE - 1);
 526
 527         tf = &ring->frames[index];
 528         tf->frame.size = 0;
 529
 530         dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy,
 531                                 tbnet_frame_size(tf), DMA_TO_DEVICE);
 532
 533         return tf;
 534 }
 535
 536 static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
 537                               bool canceled)
 538 {
 539         struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame);
 540         struct tbnet *net = netdev_priv(tf->dev);
 541
 542         /* Return buffer to the ring */
 543         net->tx_ring.prod++;
 544
 545         if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2)
 546                 netif_wake_queue(net->dev);
 547 }
 548
 549 static int tbnet_alloc_tx_buffers(struct tbnet *net)
 550 {
 551         struct tbnet_ring *ring = &net->tx_ring;
 552         struct device *dma_dev = tb_ring_dma_device(ring->ring);
 553         unsigned int i;
 554
 555         for (i = 0; i < TBNET_RING_SIZE; i++) {
 556                 struct tbnet_frame *tf = &ring->frames[i];
 557                 dma_addr_t dma_addr;
 558
 559                 tf->page = alloc_page(GFP_KERNEL);
 560                 if (!tf->page) {
 561                         tbnet_free_buffers(ring);
 562                         return -ENOMEM;
 563                 }
 564
 565                 dma_addr = dma_map_page(dma_dev, tf->page, 0, TBNET_FRAME_SIZE,
 566                                         DMA_TO_DEVICE);
 567                 if (dma_mapping_error(dma_dev, dma_addr)) {
 568                         __free_page(tf->page);
 569                         tf->page = NULL;
 570                         tbnet_free_buffers(ring);
 571                         return -ENOMEM;
 572                 }
 573
 574                 tf->dev = net->dev;
 575                 tf->frame.buffer_phy = dma_addr;
 576                 tf->frame.callback = tbnet_tx_callback;
 577                 tf->frame.sof = TBIP_PDF_FRAME_START;
 578                 tf->frame.eof = TBIP_PDF_FRAME_END;
 579         }
 580
 581         ring->cons = 0;
 582         ring->prod = TBNET_RING_SIZE - 1;
 583
 584         return 0;
 585 }
 586
 587 static void tbnet_connected_work(struct work_struct *work)
 588 {
 589         struct tbnet *net = container_of(work, typeof(*net), connected_work);
 590         bool connected;
 591         int ret;
 592
 593         if (netif_carrier_ok(net->dev))
 594                 return;
 595
 596         mutex_lock(&net->connection_lock);
 597         connected = net->login_sent && net->login_received;
 598         mutex_unlock(&net->connection_lock);
 599
 600         if (!connected)
 601                 return;
 602
 603         /* Both logins successful so enable the high-speed DMA paths and
 604          * start the network device queue.
 605          */
 606         ret = tb_xdomain_enable_paths(net->xd, TBNET_LOCAL_PATH,
 607                                       net->rx_ring.ring->hop,
 608                                       net->transmit_path,
 609                                       net->tx_ring.ring->hop);
 610         if (ret) {
 611                 netdev_err(net->dev, "failed to enable DMA paths\n");
 612                 return;
 613         }
 614
 615         tb_ring_start(net->tx_ring.ring);
 616         tb_ring_start(net->rx_ring.ring);
 617
 618         ret = tbnet_alloc_rx_buffers(net, TBNET_RING_SIZE);
 619         if (ret)
 620                 goto err_stop_rings;
 621
 622         ret = tbnet_alloc_tx_buffers(net);
 623         if (ret)
 624                 goto err_free_rx_buffers;
 625
 626         netif_carrier_on(net->dev);
 627         netif_start_queue(net->dev);
 628         return;
 629
 630 err_free_rx_buffers:
 631         tbnet_free_buffers(&net->rx_ring);
 632 err_stop_rings:
 633         tb_ring_stop(net->rx_ring.ring);
 634         tb_ring_stop(net->tx_ring.ring);
 635 }
 636
 637 static void tbnet_login_work(struct work_struct *work)
 638 {
 639         struct tbnet *net = container_of(work, typeof(*net), login_work.work);
 640         unsigned long delay = msecs_to_jiffies(TBNET_LOGIN_DELAY);
 641         int ret;
 642
 643         if (netif_carrier_ok(net->dev))
 644                 return;
 645
 646         ret = tbnet_login_request(net, net->login_retries % 4);
 647         if (ret) {
 648                 if (net->login_retries++ < TBNET_LOGIN_RETRIES) {
 649                         queue_delayed_work(system_long_wq, &net->login_work,
 650                                            delay);
 651                 } else {
 652                         netdev_info(net->dev, "ThunderboltIP login timed out\n");
 653                 }
 654         } else {
 655                 net->login_retries = 0;
 656
 657                 mutex_lock(&net->connection_lock);
 658                 net->login_sent = true;
 659                 mutex_unlock(&net->connection_lock);
 660
 661                 queue_work(system_long_wq, &net->connected_work);
 662         }
 663 }
 664
 665 static void tbnet_disconnect_work(struct work_struct *work)
 666 {
 667         struct tbnet *net = container_of(work, typeof(*net), disconnect_work);
 668
 669         tbnet_tear_down(net, false);
 670 }
 671
 672 static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf,
 673                               const struct thunderbolt_ip_frame_header *hdr)
 674 {
 675         u32 frame_id, frame_count, frame_size, frame_index;
 676         unsigned int size;
 677
 678         if (tf->frame.flags & RING_DESC_CRC_ERROR) {
 679                 net->stats.rx_crc_errors++;
 680                 return false;
 681         } else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) {
 682                 net->stats.rx_over_errors++;
 683                 return false;
 684         }
 685
 686         /* Should be greater than just header i.e. contains data */
 687         size = tbnet_frame_size(tf);
 688         if (size <= sizeof(*hdr)) {
 689                 net->stats.rx_length_errors++;
 690                 return false;
 691         }
 692
 693         frame_count = le32_to_cpu(hdr->frame_count);
 694         frame_size = le32_to_cpu(hdr->frame_size);
 695         frame_index = le16_to_cpu(hdr->frame_index);
 696         frame_id = le16_to_cpu(hdr->frame_id);
 697
 698         if ((frame_size > size - sizeof(*hdr)) || !frame_size) {
 699                 net->stats.rx_length_errors++;
 700                 return false;
 701         }
 702
 703         /* In case we're in the middle of packet, validate the frame
 704          * header based on first fragment of the packet.
 705          */
 706         if (net->skb && net->rx_hdr.frame_count) {
 707                 /* Check the frame count fits the count field */
 708                 if (frame_count != net->rx_hdr.frame_count) {
 709                         net->stats.rx_length_errors++;
 710                         return false;
 711                 }
 712
 713                 /* Check the frame identifiers are incremented correctly,
 714                  * and id is matching.
 715                  */
 716                 if (frame_index != net->rx_hdr.frame_index + 1 ||
 717                     frame_id != net->rx_hdr.frame_id) {
 718                         net->stats.rx_missed_errors++;
 719                         return false;
 720                 }
 721
 722                 if (net->skb->len + frame_size > TBNET_MAX_MTU) {
 723                         net->stats.rx_length_errors++;
 724                         return false;
 725                 }
 726
 727                 return true;
 728         }
 729
 730         /* Start of packet, validate the frame header */
 731         if (frame_count == 0 || frame_count > TBNET_RING_SIZE / 4) {
 732                 net->stats.rx_length_errors++;
 733                 return false;
 734         }
 735         if (frame_index != 0) {
 736                 net->stats.rx_missed_errors++;
 737                 return false;
 738         }
 739
 740         return true;
 741 }
 742
 743 static int tbnet_poll(struct napi_struct *napi, int budget)
 744 {
 745         struct tbnet *net = container_of(napi, struct tbnet, napi);
 746         unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring);
 747         struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring);
 748         unsigned int rx_packets = 0;
 749
 750         while (rx_packets < budget) {
 751                 const struct thunderbolt_ip_frame_header *hdr;
 752                 unsigned int hdr_size = sizeof(*hdr);
 753                 struct sk_buff *skb = NULL;
 754                 struct ring_frame *frame;
 755                 struct tbnet_frame *tf;
 756                 struct page *page;
 757                 bool last = true;
 758                 u32 frame_size;
 759
 760                 /* Return some buffers to hardware, one at a time is too
 761                  * slow so allocate MAX_SKB_FRAGS buffers at the same
 762                  * time.
 763                  */
 764                 if (cleaned_count >= MAX_SKB_FRAGS) {
 765                         tbnet_alloc_rx_buffers(net, cleaned_count);
 766                         cleaned_count = 0;
 767                 }
 768
 769                 frame = tb_ring_poll(net->rx_ring.ring);
 770                 if (!frame)
 771                         break;
 772
 773                 dma_unmap_page(dma_dev, frame->buffer_phy,
 774                                TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);
 775
 776                 tf = container_of(frame, typeof(*tf), frame);
 777
 778                 page = tf->page;
 779                 tf->page = NULL;
 780                 net->rx_ring.cons++;
 781                 cleaned_count++;
 782
 783                 hdr = page_address(page);
 784                 if (!tbnet_check_frame(net, tf, hdr)) {
 785                         __free_pages(page, TBNET_RX_PAGE_ORDER);
 786                         dev_kfree_skb_any(net->skb);
 787                         net->skb = NULL;
 788                         continue;
 789                 }
 790
 791                 frame_size = le32_to_cpu(hdr->frame_size);
 792
 793                 skb = net->skb;
 794                 if (!skb) {
 795                         skb = build_skb(page_address(page),
 796                                         TBNET_RX_PAGE_SIZE);
 797                         if (!skb) {
 798                                 __free_pages(page, TBNET_RX_PAGE_ORDER);
 799                                 net->stats.rx_errors++;
 800                                 break;
 801                         }
 802
 803                         skb_reserve(skb, hdr_size);
 804                         skb_put(skb, frame_size);
 805
 806                         net->skb = skb;
 807                 } else {
 808                         skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
 809                                         page, hdr_size, frame_size,
 810                                         TBNET_RX_PAGE_SIZE - hdr_size);
 811                 }
 812
 813                 net->rx_hdr.frame_size = frame_size;
 814                 net->rx_hdr.frame_count = le32_to_cpu(hdr->frame_count);
 815                 net->rx_hdr.frame_index = le16_to_cpu(hdr->frame_index);
 816                 net->rx_hdr.frame_id = le16_to_cpu(hdr->frame_id);
 817                 last = net->rx_hdr.frame_index == net->rx_hdr.frame_count - 1;
 818
 819                 rx_packets++;
 820                 net->stats.rx_bytes += frame_size;
 821
 822                 if (last) {
 823                         skb->protocol = eth_type_trans(skb, net->dev);
 824                         napi_gro_receive(&net->napi, skb);
 825                         net->skb = NULL;
 826                 }
 827         }
 828
 829         net->stats.rx_packets += rx_packets;
 830
 831         if (cleaned_count)
 832                 tbnet_alloc_rx_buffers(net, cleaned_count);
 833
 834         if (rx_packets >= budget)
 835                 return budget;
 836
 837         napi_complete_done(napi, rx_packets);
 838         /* Re-enable the ring interrupt */
 839         tb_ring_poll_complete(net->rx_ring.ring);
 840
 841         return rx_packets;
 842 }
 843
 844 static void tbnet_start_poll(void *data)
 845 {
 846         struct tbnet *net = data;
 847
 848         napi_schedule(&net->napi);
 849 }
 850
 851 static int tbnet_open(struct net_device *dev)
 852 {
 853         struct tbnet *net = netdev_priv(dev);
 854         struct tb_xdomain *xd = net->xd;
 855         u16 sof_mask, eof_mask;
 856         struct tb_ring *ring;
 857
 858         netif_carrier_off(dev);
 859
 860         ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE,
 861                                 RING_FLAG_FRAME);
 862         if (!ring) {
 863                 netdev_err(dev, "failed to allocate Tx ring\n");
 864                 return -ENOMEM;
 865         }
 866         net->tx_ring.ring = ring;
 867
 868         sof_mask = BIT(TBIP_PDF_FRAME_START);
 869         eof_mask = BIT(TBIP_PDF_FRAME_END);
 870
 871         ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE,
 872                                 RING_FLAG_FRAME | RING_FLAG_E2E, sof_mask,
 873                                 eof_mask, tbnet_start_poll, net);
 874         if (!ring) {
 875                 netdev_err(dev, "failed to allocate Rx ring\n");
 876                 tb_ring_free(net->tx_ring.ring);
 877                 net->tx_ring.ring = NULL;
 878                 return -ENOMEM;
 879         }
 880         net->rx_ring.ring = ring;
 881
 882         napi_enable(&net->napi);
 883         start_login(net);
 884
 885         return 0;
 886 }
 887
 888 static int tbnet_stop(struct net_device *dev)
 889 {
 890         struct tbnet *net = netdev_priv(dev);
 891
 892         napi_disable(&net->napi);
 893
 894         cancel_work_sync(&net->disconnect_work);
 895         tbnet_tear_down(net, true);
 896
 897         tb_ring_free(net->rx_ring.ring);
 898         net->rx_ring.ring = NULL;
 899         tb_ring_free(net->tx_ring.ring);
 900         net->tx_ring.ring = NULL;
 901
 902         return 0;
 903 }
 904
 905 static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
 906         struct tbnet_frame **frames, u32 frame_count)
 907 {
 908         struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page);
 909         struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring);
 910         __wsum wsum = htonl(skb->len - skb_transport_offset(skb));
 911         unsigned int i, len, offset = skb_transport_offset(skb);
 912         __be16 protocol = skb->protocol;
 913         void *data = skb->data;
 914         void *dest = hdr + 1;
 915         __sum16 *tucso;
 916
 917         if (skb->ip_summed != CHECKSUM_PARTIAL) {
 918                 /* No need to calculate checksum so we just update the
 919                  * total frame count and sync the frames for DMA.
 920                  */
 921                 for (i = 0; i < frame_count; i++) {
 922                         hdr = page_address(frames[i]->page);
 923                         hdr->frame_count = cpu_to_le32(frame_count);
 924                         dma_sync_single_for_device(dma_dev,
 925                                 frames[i]->frame.buffer_phy,
 926                                 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
 927                 }
 928
 929                 return true;
 930         }
 931
 932         if (protocol == htons(ETH_P_8021Q)) {
 933                 struct vlan_hdr *vhdr, vh;
 934
 935                 vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh);
 936                 if (!vhdr)
 937                         return false;
 938
 939                 protocol = vhdr->h_vlan_encapsulated_proto;
 940         }
 941
 942         /* Data points on the beginning of packet.
 943          * Check is the checksum absolute place in the packet.
 944          * ipcso will update IP checksum.
 945          * tucso will update TCP/UPD checksum.
 946          */
 947         if (protocol == htons(ETH_P_IP)) {
 948                 __sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data);
 949
 950                 *ipcso = 0;
 951                 *ipcso = ip_fast_csum(dest + skb_network_offset(skb),
 952                                       ip_hdr(skb)->ihl);
 953
 954                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 955                         tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
 956                 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
 957                         tucso = dest + ((void *)&(udp_hdr(skb)->check) - data);
 958                 else
 959                         return false;
 960
 961                 *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 962                                             ip_hdr(skb)->daddr, 0,
 963                                             ip_hdr(skb)->protocol, 0);
 964         } else if (skb_is_gso_v6(skb)) {
 965                 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
 966                 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 967                                           &ipv6_hdr(skb)->daddr, 0,
 968                                           IPPROTO_TCP, 0);
 969                 return false;
 970         } else if (protocol == htons(ETH_P_IPV6)) {
 971                 tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset;
 972                 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 973                                           &ipv6_hdr(skb)->daddr, 0,
 974                                           ipv6_hdr(skb)->nexthdr, 0);
 975         } else {
 976                 return false;
 977         }
 978
 979         /* First frame was headers, rest of the frames contain data.
 980          * Calculate checksum over each frame.
 981          */
 982         for (i = 0; i < frame_count; i++) {
 983                 hdr = page_address(frames[i]->page);
 984                 dest = (void *)(hdr + 1) + offset;
 985                 len = le32_to_cpu(hdr->frame_size) - offset;
 986                 wsum = csum_partial(dest, len, wsum);
 987                 hdr->frame_count = cpu_to_le32(frame_count);
 988
 989                 offset = 0;
 990         }
 991
 992         *tucso = csum_fold(wsum);
 993
 994         /* Checksum is finally calculated and we don't touch the memory
 995          * anymore, so DMA sync the frames now.
 996          */
 997         for (i = 0; i < frame_count; i++) {
 998                 dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy,
 999                         tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
1000         }
1001
1002         return true;
1003 }
1004
1005 static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num,
1006                              unsigned int *len)
1007 {
1008         const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num];
1009
1010         *len = skb_frag_size(frag);
1011         return kmap_atomic(skb_frag_page(frag)) + frag->page_offset;
1012 }
1013
1014 static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
1015                                     struct net_device *dev)
1016 {
1017         struct tbnet *net = netdev_priv(dev);
1018         struct tbnet_frame *frames[MAX_SKB_FRAGS];
1019         u16 frame_id = atomic_read(&net->frame_id);
1020         struct thunderbolt_ip_frame_header *hdr;
1021         unsigned int len = skb_headlen(skb);
1022         unsigned int data_len = skb->len;
1023         unsigned int nframes, i;
1024         unsigned int frag = 0;
1025         void *src = skb->data;
1026         u32 frame_index = 0;
1027         bool unmap = false;
1028         void *dest;
1029
1030         nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE);
1031         if (tbnet_available_buffers(&net->tx_ring) < nframes) {
1032                 netif_stop_queue(net->dev);
1033                 return NETDEV_TX_BUSY;
1034         }
1035
1036         frames[frame_index] = tbnet_get_tx_buffer(net);
1037         if (!frames[frame_index])
1038                 goto err_drop;
1039
1040         hdr = page_address(frames[frame_index]->page);
1041         dest = hdr + 1;
1042
1043         /* If overall packet is bigger than the frame data size */
1044         while (data_len > TBNET_MAX_PAYLOAD_SIZE) {
1045                 unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE;
1046
1047                 hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE);
1048                 hdr->frame_index = cpu_to_le16(frame_index);
1049                 hdr->frame_id = cpu_to_le16(frame_id);
1050
1051                 do {
1052                         if (len > size_left) {
1053                                 /* Copy data onto Tx buffer data with
1054                                  * full frame size then break and go to
1055                                  * next frame
1056                                  */
1057                                 memcpy(dest, src, size_left);
1058                                 len -= size_left;
1059                                 dest += size_left;
1060                                 src += size_left;
1061                                 break;
1062                         }
1063
1064                         memcpy(dest, src, len);
1065                         size_left -= len;
1066                         dest += len;
1067
1068                         if (unmap) {
1069                                 kunmap_atomic(src);
1070                                 unmap = false;
1071                         }
1072
1073                         /* Ensure all fragments have been processed */
1074                         if (frag < skb_shinfo(skb)->nr_frags) {
1075                                 /* Map and then unmap quickly */
1076                                 src = tbnet_kmap_frag(skb, frag++, &len);
1077                                 unmap = true;
1078                         } else if (unlikely(size_left > 0)) {
1079                                 goto err_drop;
1080                         }
1081                 } while (size_left > 0);
1082
1083                 data_len -= TBNET_MAX_PAYLOAD_SIZE;
1084                 frame_index++;
1085
1086                 frames[frame_index] = tbnet_get_tx_buffer(net);
1087                 if (!frames[frame_index])
1088                         goto err_drop;
1089
1090                 hdr = page_address(frames[frame_index]->page);
1091                 dest = hdr + 1;
1092         }
1093
1094         hdr->frame_size = cpu_to_le32(data_len);
1095         hdr->frame_index = cpu_to_le16(frame_index);
1096         hdr->frame_id = cpu_to_le16(frame_id);
1097
1098         frames[frame_index]->frame.size = data_len + sizeof(*hdr);
1099
1100         /* In case the remaining data_len is smaller than a frame */
1101         while (len < data_len) {
1102                 memcpy(dest, src, len);
1103                 data_len -= len;
1104                 dest += len;
1105
1106                 if (unmap) {
1107                         kunmap_atomic(src);
1108                         unmap = false;
1109                 }
1110
1111                 if (frag < skb_shinfo(skb)->nr_frags) {
1112                         src = tbnet_kmap_frag(skb, frag++, &len);
1113                         unmap = true;
1114                 } else if (unlikely(data_len > 0)) {
1115                         goto err_drop;
1116                 }
1117         }
1118
1119         memcpy(dest, src, data_len);
1120
1121         if (unmap)
1122                 kunmap_atomic(src);
1123
1124         if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1))
1125                 goto err_drop;
1126
1127         for (i = 0; i < frame_index + 1; i++)
1128                 tb_ring_tx(net->tx_ring.ring, &frames[i]->frame);
1129
1130         if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID)
1131                 atomic_inc(&net->frame_id);
1132
1133         net->stats.tx_packets++;
1134         net->stats.tx_bytes += skb->len;
1135
1136         dev_consume_skb_any(skb);
1137
1138         return NETDEV_TX_OK;
1139
1140 err_drop:
1141         /* We can re-use the buffers */
1142         net->tx_ring.cons -= frame_index;
1143
1144         dev_kfree_skb_any(skb);
1145         net->stats.tx_errors++;
1146
1147         return NETDEV_TX_OK;
1148 }
1149
1150 static void tbnet_get_stats64(struct net_device *dev,
1151                               struct rtnl_link_stats64 *stats)
1152 {
1153         struct tbnet *net = netdev_priv(dev);
1154
1155         stats->tx_packets = net->stats.tx_packets;
1156         stats->rx_packets = net->stats.rx_packets;
1157         stats->tx_bytes = net->stats.tx_bytes;
1158         stats->rx_bytes = net->stats.rx_bytes;
1159         stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors +
1160                 net->stats.rx_over_errors + net->stats.rx_crc_errors +
1161                 net->stats.rx_missed_errors;
1162         stats->tx_errors = net->stats.tx_errors;
1163         stats->rx_length_errors = net->stats.rx_length_errors;
1164         stats->rx_over_errors = net->stats.rx_over_errors;
1165         stats->rx_crc_errors = net->stats.rx_crc_errors;
1166         stats->rx_missed_errors = net->stats.rx_missed_errors;
1167 }
1168
1169 static const struct net_device_ops tbnet_netdev_ops = {
1170         .ndo_open = tbnet_open,
1171         .ndo_stop = tbnet_stop,
1172         .ndo_start_xmit = tbnet_start_xmit,
1173         .ndo_get_stats64 = tbnet_get_stats64,
1174 };
1175
1176 static void tbnet_generate_mac(struct net_device *dev)
1177 {
1178         const struct tbnet *net = netdev_priv(dev);
1179         const struct tb_xdomain *xd = net->xd;
1180         u8 phy_port;
1181         u32 hash;
1182
1183         phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route));
1184
1185         /* Unicast and locally administered MAC */
1186         dev->dev_addr[0] = phy_port << 4 | 0x02;
1187         hash = jhash2((u32 *)xd->local_uuid, 4, 0);
1188         memcpy(dev->dev_addr + 1, &hash, sizeof(hash));
1189         hash = jhash2((u32 *)xd->local_uuid, 4, hash);
1190         dev->dev_addr[5] = hash & 0xff;
1191 }
1192
1193 static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id)
1194 {
1195         struct tb_xdomain *xd = tb_service_parent(svc);
1196         struct net_device *dev;
1197         struct tbnet *net;
1198         int ret;
1199
1200         dev = alloc_etherdev(sizeof(*net));
1201         if (!dev)
1202                 return -ENOMEM;
1203
1204         SET_NETDEV_DEV(dev, &svc->dev);
1205
1206         net = netdev_priv(dev);
1207         INIT_DELAYED_WORK(&net->login_work, tbnet_login_work);
1208         INIT_WORK(&net->connected_work, tbnet_connected_work);
1209         INIT_WORK(&net->disconnect_work, tbnet_disconnect_work);
1210         mutex_init(&net->connection_lock);
1211         atomic_set(&net->command_id, 0);
1212         atomic_set(&net->frame_id, 0);
1213         net->svc = svc;
1214         net->dev = dev;
1215         net->xd = xd;
1216
1217         tbnet_generate_mac(dev);
1218
1219         strcpy(dev->name, "thunderbolt%d");
1220         dev->netdev_ops = &tbnet_netdev_ops;
1221
1222         /* ThunderboltIP takes advantage of TSO packets but instead of
1223          * segmenting them we just split the packet into Thunderbolt
1224          * frames (maximum payload size of each frame is 4084 bytes) and
1225          * calculate checksum over the whole packet here.
1226          *
1227          * The receiving side does the opposite if the host OS supports
1228          * LRO, otherwise it needs to split the large packet into MTU
1229          * sized smaller packets.
1230          *
1231          * In order to receive large packets from the networking stack,
1232          * we need to announce support for most of the offloading
1233          * features here.
1234          */
1235         dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO |
1236                            NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1237         dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1238         dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header);
1239
1240         netif_napi_add(dev, &net->napi, tbnet_poll, NAPI_POLL_WEIGHT);
1241
1242         /* MTU range: 68 - 65522 */
1243         dev->min_mtu = ETH_MIN_MTU;
1244         dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN;
1245
1246         net->handler.uuid = &tbnet_svc_uuid;
1247         net->handler.callback = tbnet_handle_packet,
1248         net->handler.data = net;
1249         tb_register_protocol_handler(&net->handler);
1250
1251         tb_service_set_drvdata(svc, net);
1252
1253         ret = register_netdev(dev);
1254         if (ret) {
1255                 tb_unregister_protocol_handler(&net->handler);
1256                 free_netdev(dev);
1257                 return ret;
1258         }
1259
1260         return 0;
1261 }
1262
1263 static void tbnet_remove(struct tb_service *svc)
1264 {
1265         struct tbnet *net = tb_service_get_drvdata(svc);
1266
1267         unregister_netdev(net->dev);
1268         tb_unregister_protocol_handler(&net->handler);
1269         free_netdev(net->dev);
1270 }
1271
1272 static void tbnet_shutdown(struct tb_service *svc)
1273 {
1274         tbnet_tear_down(tb_service_get_drvdata(svc), true);
1275 }
1276
1277 static int __maybe_unused tbnet_suspend(struct device *dev)
1278 {
1279         struct tb_service *svc = tb_to_service(dev);
1280         struct tbnet *net = tb_service_get_drvdata(svc);
1281
1282         stop_login(net);
1283         if (netif_running(net->dev)) {
1284                 netif_device_detach(net->dev);
1285                 tbnet_tear_down(net, true);
1286         }
1287
1288         return 0;
1289 }
1290
1291 static int __maybe_unused tbnet_resume(struct device *dev)
1292 {
1293         struct tb_service *svc = tb_to_service(dev);
1294         struct tbnet *net = tb_service_get_drvdata(svc);
1295
1296         netif_carrier_off(net->dev);
1297         if (netif_running(net->dev)) {
1298                 netif_device_attach(net->dev);
1299                 start_login(net);
1300         }
1301
1302         return 0;
1303 }
1304
1305 static const struct dev_pm_ops tbnet_pm_ops = {
1306         SET_SYSTEM_SLEEP_PM_OPS(tbnet_suspend, tbnet_resume)
1307 };
1308
1309 static const struct tb_service_id tbnet_ids[] = {
1310         { TB_SERVICE("network", 1) },
1311         { },
1312 };
1313 MODULE_DEVICE_TABLE(tbsvc, tbnet_ids);
1314
1315 static struct tb_service_driver tbnet_driver = {
1316         .driver = {
1317                 .owner = THIS_MODULE,
1318                 .name = "thunderbolt-net",
1319                 .pm = &tbnet_pm_ops,
1320         },
1321         .probe = tbnet_probe,
1322         .remove = tbnet_remove,
1323         .shutdown = tbnet_shutdown,
1324         .id_table = tbnet_ids,
1325 };
1326
1327 static int __init tbnet_init(void)
1328 {
1329         int ret;
1330
1331         tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid);
1332         if (!tbnet_dir)
1333                 return -ENOMEM;
1334
1335         tb_property_add_immediate(tbnet_dir, "prtcid", 1);
1336         tb_property_add_immediate(tbnet_dir, "prtcvers", 1);
1337         tb_property_add_immediate(tbnet_dir, "prtcrevs", 1);
1338         tb_property_add_immediate(tbnet_dir, "prtcstns",
1339                                   TBNET_MATCH_FRAGS_ID);
1340
1341         ret = tb_register_property_dir("network", tbnet_dir);
1342         if (ret) {
1343                 tb_property_free_dir(tbnet_dir);
1344                 return ret;
1345         }
1346
1347         return tb_register_service_driver(&tbnet_driver);
1348 }
1349 module_init(tbnet_init);
1350
1351 static void __exit tbnet_exit(void)
1352 {
1353         tb_unregister_service_driver(&tbnet_driver);
1354         tb_unregister_property_dir("network", tbnet_dir);
1355         tb_property_free_dir(tbnet_dir);
1356 }
1357 module_exit(tbnet_exit);
1358
1359 MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>");
1360 MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>");
1361 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1362 MODULE_DESCRIPTION("Thunderbolt network driver");
1363 MODULE_LICENSE("GPL v2");