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