linux/drivers/net/thunderbolt.c
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   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 */
  61struct thunderbolt_ip_frame_header {
  62        u32 frame_size;
  63        u16 frame_index;
  64        u16 frame_id;
  65        u32 frame_count;
  66};
  67
  68enum thunderbolt_ip_frame_pdf {
  69        TBIP_PDF_FRAME_START = 1,
  70        TBIP_PDF_FRAME_END,
  71};
  72
  73enum thunderbolt_ip_type {
  74        TBIP_LOGIN,
  75        TBIP_LOGIN_RESPONSE,
  76        TBIP_LOGOUT,
  77        TBIP_STATUS,
  78};
  79
  80struct 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
  95struct 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
 104struct 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
 112struct thunderbolt_ip_logout {
 113        struct thunderbolt_ip_header hdr;
 114};
 115
 116struct thunderbolt_ip_status {
 117        struct thunderbolt_ip_header hdr;
 118        u32 status;
 119};
 120
 121struct 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
 134struct tbnet_frame {
 135        struct net_device *dev;
 136        struct page *page;
 137        struct ring_frame frame;
 138};
 139
 140struct 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 */
 179struct 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 */
 203static 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 */
 208static const uuid_t tbnet_svc_uuid =
 209        UUID_INIT(0x798f589e, 0x3616, 0x8a47,
 210                  0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd);
 211
 212static struct tb_property_dir *tbnet_dir;
 213
 214static 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
 234static 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
 251static 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
 271static 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
 285static 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
 302static 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
 313static void stop_login(struct tbnet *net)
 314{
 315        cancel_delayed_work_sync(&net->login_work);
 316        cancel_work_sync(&net->connected_work);
 317}
 318
 319static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf)
 320{
 321        return tf->frame.size ? : TBNET_FRAME_SIZE;
 322}
 323
 324static 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
 360static 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
 394static 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
 464static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring)
 465{
 466        return ring->prod - ring->cons;
 467}
 468
 469static 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
 510err_free:
 511        tbnet_free_buffers(ring);
 512        return ret;
 513}
 514
 515static 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
 536static 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
 549static 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
 587static 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
 630err_free_rx_buffers:
 631        tbnet_free_buffers(&net->rx_ring);
 632err_stop_rings:
 633        tb_ring_stop(net->rx_ring.ring);
 634        tb_ring_stop(net->tx_ring.ring);
 635}
 636
 637static 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
 665static 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
 672static 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
 743static 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
 844static void tbnet_start_poll(void *data)
 845{
 846        struct tbnet *net = data;
 847
 848        napi_schedule(&net->napi);
 849}
 850
 851static 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, 0, sof_mask, eof_mask,
 873                                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
 888static 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
 905static 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
1005static 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
1014static 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
1140err_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
1150static 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
1169static 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
1176static 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
1193static 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
1263static 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
1272static void tbnet_shutdown(struct tb_service *svc)
1273{
1274        tbnet_tear_down(tb_service_get_drvdata(svc), true);
1275}
1276
1277static 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
1291static 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
1305static const struct dev_pm_ops tbnet_pm_ops = {
1306        SET_SYSTEM_SLEEP_PM_OPS(tbnet_suspend, tbnet_resume)
1307};
1308
1309static const struct tb_service_id tbnet_ids[] = {
1310        { TB_SERVICE("network", 1) },
1311        { },
1312};
1313MODULE_DEVICE_TABLE(tbsvc, tbnet_ids);
1314
1315static 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
1327static 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}
1349module_init(tbnet_init);
1350
1351static 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}
1357module_exit(tbnet_exit);
1358
1359MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>");
1360MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>");
1361MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1362MODULE_DESCRIPTION("Thunderbolt network driver");
1363MODULE_LICENSE("GPL v2");
1364