drivers/net/thunderbolt.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
tbnet_fill_header
tbnet_login_response
tbnet_login_request
tbnet_logout_response
tbnet_logout_request
start_login
stop_login
tbnet_frame_size
tbnet_free_buffers
tbnet_tear_down
tbnet_handle_packet
tbnet_available_buffers
tbnet_alloc_rx_buffers
tbnet_get_tx_buffer
tbnet_tx_callback
tbnet_alloc_tx_buffers
tbnet_connected_work
tbnet_login_work
tbnet_disconnect_work
tbnet_check_frame
tbnet_poll
tbnet_start_poll
tbnet_open
tbnet_stop
tbnet_xmit_csum_and_map
tbnet_kmap_frag
tbnet_start_xmit
tbnet_get_stats64
tbnet_generate_mac
tbnet_probe
tbnet_remove
tbnet_shutdown
tbnet_suspend
tbnet_resume
tbnet_init
tbnet_exit
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Networking over Thunderbolt cable using Apple ThunderboltIP protocol
   4  *
   5  * Copyright (C) 2017, Intel Corporation
   6  * Authors: Amir Levy <amir.jer.levy@intel.com>
   7  *          Michael Jamet <michael.jamet@intel.com>
   8  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   9  */
  10 
  11 #include <linux/atomic.h>
  12 #include <linux/highmem.h>
  13 #include <linux/if_vlan.h>
  14 #include <linux/jhash.h>
  15 #include <linux/module.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/sizes.h>
  19 #include <linux/thunderbolt.h>
  20 #include <linux/uuid.h>
  21 #include <linux/workqueue.h>
  22 
  23 #include <net/ip6_checksum.h>
  24 
  25 /* Protocol timeouts in ms */
  26 #define TBNET_LOGIN_DELAY       4500
  27 #define TBNET_LOGIN_TIMEOUT     500
  28 #define TBNET_LOGOUT_TIMEOUT    100
  29 
  30 #define TBNET_RING_SIZE         256
  31 #define TBNET_LOCAL_PATH        0xf
  32 #define TBNET_LOGIN_RETRIES     60
  33 #define TBNET_LOGOUT_RETRIES    5
  34 #define TBNET_MATCH_FRAGS_ID    BIT(1)
  35 #define TBNET_MAX_MTU           SZ_64K
  36 #define TBNET_FRAME_SIZE        SZ_4K
  37 #define TBNET_MAX_PAYLOAD_SIZE  \
  38         (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header))
  39 /* Rx packets need to hold space for skb_shared_info */
  40 #define TBNET_RX_MAX_SIZE       \
  41         (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
  42 #define TBNET_RX_PAGE_ORDER     get_order(TBNET_RX_MAX_SIZE)
  43 #define TBNET_RX_PAGE_SIZE      (PAGE_SIZE << TBNET_RX_PAGE_ORDER)
  44 
  45 #define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0))
  46 
  47 /**
  48  * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame
  49  * @frame_size: size of the data with the frame
  50  * @frame_index: running index on the frames
  51  * @frame_id: ID of the frame to match frames to specific packet
  52  * @frame_count: how many frames assembles a full packet
  53  *
  54  * Each data frame passed to the high-speed DMA ring has this header. If
  55  * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is
  56  * supported then @frame_id is filled, otherwise it stays %0.
  57  */
  58 struct thunderbolt_ip_frame_header {
  59         u32 frame_size;
  60         u16 frame_index;
  61         u16 frame_id;
  62         u32 frame_count;
  63 };
  64 
  65 enum thunderbolt_ip_frame_pdf {
  66         TBIP_PDF_FRAME_START = 1,
  67         TBIP_PDF_FRAME_END,
  68 };
  69 
  70 enum thunderbolt_ip_type {
  71         TBIP_LOGIN,
  72         TBIP_LOGIN_RESPONSE,
  73         TBIP_LOGOUT,
  74         TBIP_STATUS,
  75 };
  76 
  77 struct thunderbolt_ip_header {
  78         u32 route_hi;
  79         u32 route_lo;
  80         u32 length_sn;
  81         uuid_t uuid;
  82         uuid_t initiator_uuid;
  83         uuid_t target_uuid;
  84         u32 type;
  85         u32 command_id;
  86 };
  87 
  88 #define TBIP_HDR_LENGTH_MASK            GENMASK(5, 0)
  89 #define TBIP_HDR_SN_MASK                GENMASK(28, 27)
  90 #define TBIP_HDR_SN_SHIFT               27
  91 
  92 struct thunderbolt_ip_login {
  93         struct thunderbolt_ip_header hdr;
  94         u32 proto_version;
  95         u32 transmit_path;
  96         u32 reserved[4];
  97 };
  98 
  99 #define TBIP_LOGIN_PROTO_VERSION        1
 100 
 101 struct thunderbolt_ip_login_response {
 102         struct thunderbolt_ip_header hdr;
 103         u32 status;
 104         u32 receiver_mac[2];
 105         u32 receiver_mac_len;
 106         u32 reserved[4];
 107 };
 108 
 109 struct thunderbolt_ip_logout {
 110         struct thunderbolt_ip_header hdr;
 111 };
 112 
 113 struct thunderbolt_ip_status {
 114         struct thunderbolt_ip_header hdr;
 115         u32 status;
 116 };
 117 
 118 struct tbnet_stats {
 119         u64 tx_packets;
 120         u64 rx_packets;
 121         u64 tx_bytes;
 122         u64 rx_bytes;
 123         u64 rx_errors;
 124         u64 tx_errors;
 125         u64 rx_length_errors;
 126         u64 rx_over_errors;
 127         u64 rx_crc_errors;
 128         u64 rx_missed_errors;
 129 };
 130 
 131 struct tbnet_frame {
 132         struct net_device *dev;
 133         struct page *page;
 134         struct ring_frame frame;
 135 };
 136 
 137 struct tbnet_ring {
 138         struct tbnet_frame frames[TBNET_RING_SIZE];
 139         unsigned int cons;
 140         unsigned int prod;
 141         struct tb_ring *ring;
 142 };
 143 
 144 /**
 145  * struct tbnet - ThunderboltIP network driver private data
 146  * @svc: XDomain service the driver is bound to
 147  * @xd: XDomain the service blongs to
 148  * @handler: ThunderboltIP configuration protocol handler
 149  * @dev: Networking device
 150  * @napi: NAPI structure for Rx polling
 151  * @stats: Network statistics
 152  * @skb: Network packet that is currently processed on Rx path
 153  * @command_id: ID used for next configuration protocol packet
 154  * @login_sent: ThunderboltIP login message successfully sent
 155  * @login_received: ThunderboltIP login message received from the remote
 156  *                  host
 157  * @transmit_path: HopID the other end needs to use building the
 158  *                 opposite side path.
 159  * @connection_lock: Lock serializing access to @login_sent,
 160  *                   @login_received and @transmit_path.
 161  * @login_retries: Number of login retries currently done
 162  * @login_work: Worker to send ThunderboltIP login packets
 163  * @connected_work: Worker that finalizes the ThunderboltIP connection
 164  *                  setup and enables DMA paths for high speed data
 165  *                  transfers
 166  * @disconnect_work: Worker that handles tearing down the ThunderboltIP
 167  *                   connection
 168  * @rx_hdr: Copy of the currently processed Rx frame. Used when a
 169  *          network packet consists of multiple Thunderbolt frames.
 170  *          In host byte order.
 171  * @rx_ring: Software ring holding Rx frames
 172  * @frame_id: Frame ID use for next Tx packet
 173  *            (if %TBNET_MATCH_FRAGS_ID is supported in both ends)
 174  * @tx_ring: Software ring holding Tx frames
 175  */
 176 struct tbnet {
 177         const struct tb_service *svc;
 178         struct tb_xdomain *xd;
 179         struct tb_protocol_handler handler;
 180         struct net_device *dev;
 181         struct napi_struct napi;
 182         struct tbnet_stats stats;
 183         struct sk_buff *skb;
 184         atomic_t command_id;
 185         bool login_sent;
 186         bool login_received;
 187         u32 transmit_path;
 188         struct mutex connection_lock;
 189         int login_retries;
 190         struct delayed_work login_work;
 191         struct work_struct connected_work;
 192         struct work_struct disconnect_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                         queue_work(system_long_wq, &net->disconnect_work);
 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 void tbnet_disconnect_work(struct work_struct *work)
 663 {
 664         struct tbnet *net = container_of(work, typeof(*net), disconnect_work);
 665 
 666         tbnet_tear_down(net, false);
 667 }
 668 
 669 static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf,
 670                               const struct thunderbolt_ip_frame_header *hdr)
 671 {
 672         u32 frame_id, frame_count, frame_size, frame_index;
 673         unsigned int size;
 674 
 675         if (tf->frame.flags & RING_DESC_CRC_ERROR) {
 676                 net->stats.rx_crc_errors++;
 677                 return false;
 678         } else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) {
 679                 net->stats.rx_over_errors++;
 680                 return false;
 681         }
 682 
 683         /* Should be greater than just header i.e. contains data */
 684         size = tbnet_frame_size(tf);
 685         if (size <= sizeof(*hdr)) {
 686                 net->stats.rx_length_errors++;
 687                 return false;
 688         }
 689 
 690         frame_count = le32_to_cpu(hdr->frame_count);
 691         frame_size = le32_to_cpu(hdr->frame_size);
 692         frame_index = le16_to_cpu(hdr->frame_index);
 693         frame_id = le16_to_cpu(hdr->frame_id);
 694 
 695         if ((frame_size > size - sizeof(*hdr)) || !frame_size) {
 696                 net->stats.rx_length_errors++;
 697                 return false;
 698         }
 699 
 700         /* In case we're in the middle of packet, validate the frame
 701          * header based on first fragment of the packet.
 702          */
 703         if (net->skb && net->rx_hdr.frame_count) {
 704                 /* Check the frame count fits the count field */
 705                 if (frame_count != net->rx_hdr.frame_count) {
 706                         net->stats.rx_length_errors++;
 707                         return false;
 708                 }
 709 
 710                 /* Check the frame identifiers are incremented correctly,
 711                  * and id is matching.
 712                  */
 713                 if (frame_index != net->rx_hdr.frame_index + 1 ||
 714                     frame_id != net->rx_hdr.frame_id) {
 715                         net->stats.rx_missed_errors++;
 716                         return false;
 717                 }
 718 
 719                 if (net->skb->len + frame_size > TBNET_MAX_MTU) {
 720                         net->stats.rx_length_errors++;
 721                         return false;
 722                 }
 723 
 724                 return true;
 725         }
 726 
 727         /* Start of packet, validate the frame header */
 728         if (frame_count == 0 || frame_count > TBNET_RING_SIZE / 4) {
 729                 net->stats.rx_length_errors++;
 730                 return false;
 731         }
 732         if (frame_index != 0) {
 733                 net->stats.rx_missed_errors++;
 734                 return false;
 735         }
 736 
 737         return true;
 738 }
 739 
 740 static int tbnet_poll(struct napi_struct *napi, int budget)
 741 {
 742         struct tbnet *net = container_of(napi, struct tbnet, napi);
 743         unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring);
 744         struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring);
 745         unsigned int rx_packets = 0;
 746 
 747         while (rx_packets < budget) {
 748                 const struct thunderbolt_ip_frame_header *hdr;
 749                 unsigned int hdr_size = sizeof(*hdr);
 750                 struct sk_buff *skb = NULL;
 751                 struct ring_frame *frame;
 752                 struct tbnet_frame *tf;
 753                 struct page *page;
 754                 bool last = true;
 755                 u32 frame_size;
 756 
 757                 /* Return some buffers to hardware, one at a time is too
 758                  * slow so allocate MAX_SKB_FRAGS buffers at the same
 759                  * time.
 760                  */
 761                 if (cleaned_count >= MAX_SKB_FRAGS) {
 762                         tbnet_alloc_rx_buffers(net, cleaned_count);
 763                         cleaned_count = 0;
 764                 }
 765 
 766                 frame = tb_ring_poll(net->rx_ring.ring);
 767                 if (!frame)
 768                         break;
 769 
 770                 dma_unmap_page(dma_dev, frame->buffer_phy,
 771                                TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);
 772 
 773                 tf = container_of(frame, typeof(*tf), frame);
 774 
 775                 page = tf->page;
 776                 tf->page = NULL;
 777                 net->rx_ring.cons++;
 778                 cleaned_count++;
 779 
 780                 hdr = page_address(page);
 781                 if (!tbnet_check_frame(net, tf, hdr)) {
 782                         __free_pages(page, TBNET_RX_PAGE_ORDER);
 783                         dev_kfree_skb_any(net->skb);
 784                         net->skb = NULL;
 785                         continue;
 786                 }
 787 
 788                 frame_size = le32_to_cpu(hdr->frame_size);
 789 
 790                 skb = net->skb;
 791                 if (!skb) {
 792                         skb = build_skb(page_address(page),
 793                                         TBNET_RX_PAGE_SIZE);
 794                         if (!skb) {
 795                                 __free_pages(page, TBNET_RX_PAGE_ORDER);
 796                                 net->stats.rx_errors++;
 797                                 break;
 798                         }
 799 
 800                         skb_reserve(skb, hdr_size);
 801                         skb_put(skb, frame_size);
 802 
 803                         net->skb = skb;
 804                 } else {
 805                         skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
 806                                         page, hdr_size, frame_size,
 807                                         TBNET_RX_PAGE_SIZE - hdr_size);
 808                 }
 809 
 810                 net->rx_hdr.frame_size = frame_size;
 811                 net->rx_hdr.frame_count = le32_to_cpu(hdr->frame_count);
 812                 net->rx_hdr.frame_index = le16_to_cpu(hdr->frame_index);
 813                 net->rx_hdr.frame_id = le16_to_cpu(hdr->frame_id);
 814                 last = net->rx_hdr.frame_index == net->rx_hdr.frame_count - 1;
 815 
 816                 rx_packets++;
 817                 net->stats.rx_bytes += frame_size;
 818 
 819                 if (last) {
 820                         skb->protocol = eth_type_trans(skb, net->dev);
 821                         napi_gro_receive(&net->napi, skb);
 822                         net->skb = NULL;
 823                 }
 824         }
 825 
 826         net->stats.rx_packets += rx_packets;
 827 
 828         if (cleaned_count)
 829                 tbnet_alloc_rx_buffers(net, cleaned_count);
 830 
 831         if (rx_packets >= budget)
 832                 return budget;
 833 
 834         napi_complete_done(napi, rx_packets);
 835         /* Re-enable the ring interrupt */
 836         tb_ring_poll_complete(net->rx_ring.ring);
 837 
 838         return rx_packets;
 839 }
 840 
 841 static void tbnet_start_poll(void *data)
 842 {
 843         struct tbnet *net = data;
 844 
 845         napi_schedule(&net->napi);
 846 }
 847 
 848 static int tbnet_open(struct net_device *dev)
 849 {
 850         struct tbnet *net = netdev_priv(dev);
 851         struct tb_xdomain *xd = net->xd;
 852         u16 sof_mask, eof_mask;
 853         struct tb_ring *ring;
 854 
 855         netif_carrier_off(dev);
 856 
 857         ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE,
 858                                 RING_FLAG_FRAME);
 859         if (!ring) {
 860                 netdev_err(dev, "failed to allocate Tx ring\n");
 861                 return -ENOMEM;
 862         }
 863         net->tx_ring.ring = ring;
 864 
 865         sof_mask = BIT(TBIP_PDF_FRAME_START);
 866         eof_mask = BIT(TBIP_PDF_FRAME_END);
 867 
 868         ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE,
 869                                 RING_FLAG_FRAME | RING_FLAG_E2E, sof_mask,
 870                                 eof_mask, tbnet_start_poll, net);
 871         if (!ring) {
 872                 netdev_err(dev, "failed to allocate Rx ring\n");
 873                 tb_ring_free(net->tx_ring.ring);
 874                 net->tx_ring.ring = NULL;
 875                 return -ENOMEM;
 876         }
 877         net->rx_ring.ring = ring;
 878 
 879         napi_enable(&net->napi);
 880         start_login(net);
 881 
 882         return 0;
 883 }
 884 
 885 static int tbnet_stop(struct net_device *dev)
 886 {
 887         struct tbnet *net = netdev_priv(dev);
 888 
 889         napi_disable(&net->napi);
 890 
 891         cancel_work_sync(&net->disconnect_work);
 892         tbnet_tear_down(net, true);
 893 
 894         tb_ring_free(net->rx_ring.ring);
 895         net->rx_ring.ring = NULL;
 896         tb_ring_free(net->tx_ring.ring);
 897         net->tx_ring.ring = NULL;
 898 
 899         return 0;
 900 }
 901 
 902 static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
 903         struct tbnet_frame **frames, u32 frame_count)
 904 {
 905         struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page);
 906         struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring);
 907         __wsum wsum = htonl(skb->len - skb_transport_offset(skb));
 908         unsigned int i, len, offset = skb_transport_offset(skb);
 909         __be16 protocol = skb->protocol;
 910         void *data = skb->data;
 911         void *dest = hdr + 1;
 912         __sum16 *tucso;
 913 
 914         if (skb->ip_summed != CHECKSUM_PARTIAL) {
 915                 /* No need to calculate checksum so we just update the
 916                  * total frame count and sync the frames for DMA.
 917                  */
 918                 for (i = 0; i < frame_count; i++) {
 919                         hdr = page_address(frames[i]->page);
 920                         hdr->frame_count = cpu_to_le32(frame_count);
 921                         dma_sync_single_for_device(dma_dev,
 922                                 frames[i]->frame.buffer_phy,
 923                                 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
 924                 }
 925 
 926                 return true;
 927         }
 928 
 929         if (protocol == htons(ETH_P_8021Q)) {
 930                 struct vlan_hdr *vhdr, vh;
 931 
 932                 vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh);
 933                 if (!vhdr)
 934                         return false;
 935 
 936                 protocol = vhdr->h_vlan_encapsulated_proto;
 937         }
 938 
 939         /* Data points on the beginning of packet.
 940          * Check is the checksum absolute place in the packet.
 941          * ipcso will update IP checksum.
 942          * tucso will update TCP/UPD checksum.
 943          */
 944         if (protocol == htons(ETH_P_IP)) {
 945                 __sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data);
 946 
 947                 *ipcso = 0;
 948                 *ipcso = ip_fast_csum(dest + skb_network_offset(skb),
 949                                       ip_hdr(skb)->ihl);
 950 
 951                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
 952                         tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
 953                 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
 954                         tucso = dest + ((void *)&(udp_hdr(skb)->check) - data);
 955                 else
 956                         return false;
 957 
 958                 *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 959                                             ip_hdr(skb)->daddr, 0,
 960                                             ip_hdr(skb)->protocol, 0);
 961         } else if (skb_is_gso_v6(skb)) {
 962                 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
 963                 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 964                                           &ipv6_hdr(skb)->daddr, 0,
 965                                           IPPROTO_TCP, 0);
 966                 return false;
 967         } else if (protocol == htons(ETH_P_IPV6)) {
 968                 tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset;
 969                 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 970                                           &ipv6_hdr(skb)->daddr, 0,
 971                                           ipv6_hdr(skb)->nexthdr, 0);
 972         } else {
 973                 return false;
 974         }
 975 
 976         /* First frame was headers, rest of the frames contain data.
 977          * Calculate checksum over each frame.
 978          */
 979         for (i = 0; i < frame_count; i++) {
 980                 hdr = page_address(frames[i]->page);
 981                 dest = (void *)(hdr + 1) + offset;
 982                 len = le32_to_cpu(hdr->frame_size) - offset;
 983                 wsum = csum_partial(dest, len, wsum);
 984                 hdr->frame_count = cpu_to_le32(frame_count);
 985 
 986                 offset = 0;
 987         }
 988 
 989         *tucso = csum_fold(wsum);
 990 
 991         /* Checksum is finally calculated and we don't touch the memory
 992          * anymore, so DMA sync the frames now.
 993          */
 994         for (i = 0; i < frame_count; i++) {
 995                 dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy,
 996                         tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
 997         }
 998 
 999         return true;
1000 }
1001 
1002 static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num,
1003                              unsigned int *len)
1004 {
1005         const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num];
1006 
1007         *len = skb_frag_size(frag);
1008         return kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag);
1009 }
1010 
1011 static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
1012                                     struct net_device *dev)
1013 {
1014         struct tbnet *net = netdev_priv(dev);
1015         struct tbnet_frame *frames[MAX_SKB_FRAGS];
1016         u16 frame_id = atomic_read(&net->frame_id);
1017         struct thunderbolt_ip_frame_header *hdr;
1018         unsigned int len = skb_headlen(skb);
1019         unsigned int data_len = skb->len;
1020         unsigned int nframes, i;
1021         unsigned int frag = 0;
1022         void *src = skb->data;
1023         u32 frame_index = 0;
1024         bool unmap = false;
1025         void *dest;
1026 
1027         nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE);
1028         if (tbnet_available_buffers(&net->tx_ring) < nframes) {
1029                 netif_stop_queue(net->dev);
1030                 return NETDEV_TX_BUSY;
1031         }
1032 
1033         frames[frame_index] = tbnet_get_tx_buffer(net);
1034         if (!frames[frame_index])
1035                 goto err_drop;
1036 
1037         hdr = page_address(frames[frame_index]->page);
1038         dest = hdr + 1;
1039 
1040         /* If overall packet is bigger than the frame data size */
1041         while (data_len > TBNET_MAX_PAYLOAD_SIZE) {
1042                 unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE;
1043 
1044                 hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE);
1045                 hdr->frame_index = cpu_to_le16(frame_index);
1046                 hdr->frame_id = cpu_to_le16(frame_id);
1047 
1048                 do {
1049                         if (len > size_left) {
1050                                 /* Copy data onto Tx buffer data with
1051                                  * full frame size then break and go to
1052                                  * next frame
1053                                  */
1054                                 memcpy(dest, src, size_left);
1055                                 len -= size_left;
1056                                 dest += size_left;
1057                                 src += size_left;
1058                                 break;
1059                         }
1060 
1061                         memcpy(dest, src, len);
1062                         size_left -= len;
1063                         dest += len;
1064 
1065                         if (unmap) {
1066                                 kunmap_atomic(src);
1067                                 unmap = false;
1068                         }
1069 
1070                         /* Ensure all fragments have been processed */
1071                         if (frag < skb_shinfo(skb)->nr_frags) {
1072                                 /* Map and then unmap quickly */
1073                                 src = tbnet_kmap_frag(skb, frag++, &len);
1074                                 unmap = true;
1075                         } else if (unlikely(size_left > 0)) {
1076                                 goto err_drop;
1077                         }
1078                 } while (size_left > 0);
1079 
1080                 data_len -= TBNET_MAX_PAYLOAD_SIZE;
1081                 frame_index++;
1082 
1083                 frames[frame_index] = tbnet_get_tx_buffer(net);
1084                 if (!frames[frame_index])
1085                         goto err_drop;
1086 
1087                 hdr = page_address(frames[frame_index]->page);
1088                 dest = hdr + 1;
1089         }
1090 
1091         hdr->frame_size = cpu_to_le32(data_len);
1092         hdr->frame_index = cpu_to_le16(frame_index);
1093         hdr->frame_id = cpu_to_le16(frame_id);
1094 
1095         frames[frame_index]->frame.size = data_len + sizeof(*hdr);
1096 
1097         /* In case the remaining data_len is smaller than a frame */
1098         while (len < data_len) {
1099                 memcpy(dest, src, len);
1100                 data_len -= len;
1101                 dest += len;
1102 
1103                 if (unmap) {
1104                         kunmap_atomic(src);
1105                         unmap = false;
1106                 }
1107 
1108                 if (frag < skb_shinfo(skb)->nr_frags) {
1109                         src = tbnet_kmap_frag(skb, frag++, &len);
1110                         unmap = true;
1111                 } else if (unlikely(data_len > 0)) {
1112                         goto err_drop;
1113                 }
1114         }
1115 
1116         memcpy(dest, src, data_len);
1117 
1118         if (unmap)
1119                 kunmap_atomic(src);
1120 
1121         if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1))
1122                 goto err_drop;
1123 
1124         for (i = 0; i < frame_index + 1; i++)
1125                 tb_ring_tx(net->tx_ring.ring, &frames[i]->frame);
1126 
1127         if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID)
1128                 atomic_inc(&net->frame_id);
1129 
1130         net->stats.tx_packets++;
1131         net->stats.tx_bytes += skb->len;
1132 
1133         dev_consume_skb_any(skb);
1134 
1135         return NETDEV_TX_OK;
1136 
1137 err_drop:
1138         /* We can re-use the buffers */
1139         net->tx_ring.cons -= frame_index;
1140 
1141         dev_kfree_skb_any(skb);
1142         net->stats.tx_errors++;
1143 
1144         return NETDEV_TX_OK;
1145 }
1146 
1147 static void tbnet_get_stats64(struct net_device *dev,
1148                               struct rtnl_link_stats64 *stats)
1149 {
1150         struct tbnet *net = netdev_priv(dev);
1151 
1152         stats->tx_packets = net->stats.tx_packets;
1153         stats->rx_packets = net->stats.rx_packets;
1154         stats->tx_bytes = net->stats.tx_bytes;
1155         stats->rx_bytes = net->stats.rx_bytes;
1156         stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors +
1157                 net->stats.rx_over_errors + net->stats.rx_crc_errors +
1158                 net->stats.rx_missed_errors;
1159         stats->tx_errors = net->stats.tx_errors;
1160         stats->rx_length_errors = net->stats.rx_length_errors;
1161         stats->rx_over_errors = net->stats.rx_over_errors;
1162         stats->rx_crc_errors = net->stats.rx_crc_errors;
1163         stats->rx_missed_errors = net->stats.rx_missed_errors;
1164 }
1165 
1166 static const struct net_device_ops tbnet_netdev_ops = {
1167         .ndo_open = tbnet_open,
1168         .ndo_stop = tbnet_stop,
1169         .ndo_start_xmit = tbnet_start_xmit,
1170         .ndo_get_stats64 = tbnet_get_stats64,
1171 };
1172 
1173 static void tbnet_generate_mac(struct net_device *dev)
1174 {
1175         const struct tbnet *net = netdev_priv(dev);
1176         const struct tb_xdomain *xd = net->xd;
1177         u8 phy_port;
1178         u32 hash;
1179 
1180         phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route));
1181 
1182         /* Unicast and locally administered MAC */
1183         dev->dev_addr[0] = phy_port << 4 | 0x02;
1184         hash = jhash2((u32 *)xd->local_uuid, 4, 0);
1185         memcpy(dev->dev_addr + 1, &hash, sizeof(hash));
1186         hash = jhash2((u32 *)xd->local_uuid, 4, hash);
1187         dev->dev_addr[5] = hash & 0xff;
1188 }
1189 
1190 static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id)
1191 {
1192         struct tb_xdomain *xd = tb_service_parent(svc);
1193         struct net_device *dev;
1194         struct tbnet *net;
1195         int ret;
1196 
1197         dev = alloc_etherdev(sizeof(*net));
1198         if (!dev)
1199                 return -ENOMEM;
1200 
1201         SET_NETDEV_DEV(dev, &svc->dev);
1202 
1203         net = netdev_priv(dev);
1204         INIT_DELAYED_WORK(&net->login_work, tbnet_login_work);
1205         INIT_WORK(&net->connected_work, tbnet_connected_work);
1206         INIT_WORK(&net->disconnect_work, tbnet_disconnect_work);
1207         mutex_init(&net->connection_lock);
1208         atomic_set(&net->command_id, 0);
1209         atomic_set(&net->frame_id, 0);
1210         net->svc = svc;
1211         net->dev = dev;
1212         net->xd = xd;
1213 
1214         tbnet_generate_mac(dev);
1215 
1216         strcpy(dev->name, "thunderbolt%d");
1217         dev->netdev_ops = &tbnet_netdev_ops;
1218 
1219         /* ThunderboltIP takes advantage of TSO packets but instead of
1220          * segmenting them we just split the packet into Thunderbolt
1221          * frames (maximum payload size of each frame is 4084 bytes) and
1222          * calculate checksum over the whole packet here.
1223          *
1224          * The receiving side does the opposite if the host OS supports
1225          * LRO, otherwise it needs to split the large packet into MTU
1226          * sized smaller packets.
1227          *
1228          * In order to receive large packets from the networking stack,
1229          * we need to announce support for most of the offloading
1230          * features here.
1231          */
1232         dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO |
1233                            NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1234         dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1235         dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header);
1236 
1237         netif_napi_add(dev, &net->napi, tbnet_poll, NAPI_POLL_WEIGHT);
1238 
1239         /* MTU range: 68 - 65522 */
1240         dev->min_mtu = ETH_MIN_MTU;
1241         dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN;
1242 
1243         net->handler.uuid = &tbnet_svc_uuid;
1244         net->handler.callback = tbnet_handle_packet,
1245         net->handler.data = net;
1246         tb_register_protocol_handler(&net->handler);
1247 
1248         tb_service_set_drvdata(svc, net);
1249 
1250         ret = register_netdev(dev);
1251         if (ret) {
1252                 tb_unregister_protocol_handler(&net->handler);
1253                 free_netdev(dev);
1254                 return ret;
1255         }
1256 
1257         return 0;
1258 }
1259 
1260 static void tbnet_remove(struct tb_service *svc)
1261 {
1262         struct tbnet *net = tb_service_get_drvdata(svc);
1263 
1264         unregister_netdev(net->dev);
1265         tb_unregister_protocol_handler(&net->handler);
1266         free_netdev(net->dev);
1267 }
1268 
1269 static void tbnet_shutdown(struct tb_service *svc)
1270 {
1271         tbnet_tear_down(tb_service_get_drvdata(svc), true);
1272 }
1273 
1274 static int __maybe_unused tbnet_suspend(struct device *dev)
1275 {
1276         struct tb_service *svc = tb_to_service(dev);
1277         struct tbnet *net = tb_service_get_drvdata(svc);
1278 
1279         stop_login(net);
1280         if (netif_running(net->dev)) {
1281                 netif_device_detach(net->dev);
1282                 tbnet_tear_down(net, true);
1283         }
1284 
1285         tb_unregister_protocol_handler(&net->handler);
1286         return 0;
1287 }
1288 
1289 static int __maybe_unused tbnet_resume(struct device *dev)
1290 {
1291         struct tb_service *svc = tb_to_service(dev);
1292         struct tbnet *net = tb_service_get_drvdata(svc);
1293 
1294         tb_register_protocol_handler(&net->handler);
1295 
1296         netif_carrier_off(net->dev);
1297         if (netif_running(net->dev)) {
1298                 netif_device_attach(net->dev);
1299                 start_login(net);
1300         }
1301 
1302         return 0;
1303 }
1304 
1305 static const struct dev_pm_ops tbnet_pm_ops = {
1306         SET_SYSTEM_SLEEP_PM_OPS(tbnet_suspend, tbnet_resume)
1307 };
1308 
1309 static const struct tb_service_id tbnet_ids[] = {
1310         { TB_SERVICE("network", 1) },
1311         { },
1312 };
1313 MODULE_DEVICE_TABLE(tbsvc, tbnet_ids);
1314 
1315 static struct tb_service_driver tbnet_driver = {
1316         .driver = {
1317                 .owner = THIS_MODULE,
1318                 .name = "thunderbolt-net",
1319                 .pm = &tbnet_pm_ops,
1320         },
1321         .probe = tbnet_probe,
1322         .remove = tbnet_remove,
1323         .shutdown = tbnet_shutdown,
1324         .id_table = tbnet_ids,
1325 };
1326 
1327 static int __init tbnet_init(void)
1328 {
1329         int ret;
1330 
1331         tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid);
1332         if (!tbnet_dir)
1333                 return -ENOMEM;
1334 
1335         tb_property_add_immediate(tbnet_dir, "prtcid", 1);
1336         tb_property_add_immediate(tbnet_dir, "prtcvers", 1);
1337         tb_property_add_immediate(tbnet_dir, "prtcrevs", 1);
1338         tb_property_add_immediate(tbnet_dir, "prtcstns",
1339                                   TBNET_MATCH_FRAGS_ID);
1340 
1341         ret = tb_register_property_dir("network", tbnet_dir);
1342         if (ret) {
1343                 tb_property_free_dir(tbnet_dir);
1344                 return ret;
1345         }
1346 
1347         return tb_register_service_driver(&tbnet_driver);
1348 }
1349 module_init(tbnet_init);
1350 
1351 static void __exit tbnet_exit(void)
1352 {
1353         tb_unregister_service_driver(&tbnet_driver);
1354         tb_unregister_property_dir("network", tbnet_dir);
1355         tb_property_free_dir(tbnet_dir);
1356 }
1357 module_exit(tbnet_exit);
1358 
1359 MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>");
1360 MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>");
1361 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1362 MODULE_DESCRIPTION("Thunderbolt network driver");
1363 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/thunderbolt.c

DEFINITIONS
