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1// SPDX-License-Identifier: GPL-2.02/*3 * Networking over Thunderbolt/USB4 cables using USB4NET protocol4 * (formerly Apple ThunderboltIP).5 *6 * Copyright (C) 2017, Intel Corporation7 * Authors: Amir Levy <amir.jer.levy@intel.com>8 * Michael Jamet <michael.jamet@intel.com>9 * Mika Westerberg <mika.westerberg@linux.intel.com>10 */11 12#include <linux/atomic.h>13#include <linux/highmem.h>14#include <linux/if_vlan.h>15#include <linux/jhash.h>16#include <linux/module.h>17#include <linux/etherdevice.h>18#include <linux/rtnetlink.h>19#include <linux/sizes.h>20#include <linux/thunderbolt.h>21#include <linux/uuid.h>22#include <linux/workqueue.h>23 24#include <net/ip6_checksum.h>25 26#include "trace.h"27 28/* Protocol timeouts in ms */29#define TBNET_LOGIN_DELAY 450030#define TBNET_LOGIN_TIMEOUT 50031#define TBNET_LOGOUT_TIMEOUT 100032 33#define TBNET_RING_SIZE 25634#define TBNET_LOGIN_RETRIES 6035#define TBNET_LOGOUT_RETRIES 1036#define TBNET_E2E BIT(0)37#define TBNET_MATCH_FRAGS_ID BIT(1)38#define TBNET_64K_FRAMES BIT(2)39#define TBNET_MAX_MTU SZ_64K40#define TBNET_FRAME_SIZE SZ_4K41#define TBNET_MAX_PAYLOAD_SIZE \42 (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header))43/* Rx packets need to hold space for skb_shared_info */44#define TBNET_RX_MAX_SIZE \45 (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))46#define TBNET_RX_PAGE_ORDER get_order(TBNET_RX_MAX_SIZE)47#define TBNET_RX_PAGE_SIZE (PAGE_SIZE << TBNET_RX_PAGE_ORDER)48 49#define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0))50 51/**52 * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame53 * @frame_size: size of the data with the frame54 * @frame_index: running index on the frames55 * @frame_id: ID of the frame to match frames to specific packet56 * @frame_count: how many frames assembles a full packet57 *58 * Each data frame passed to the high-speed DMA ring has this header. If59 * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is60 * supported then @frame_id is filled, otherwise it stays %0.61 */62struct thunderbolt_ip_frame_header {63 __le32 frame_size;64 __le16 frame_index;65 __le16 frame_id;66 __le32 frame_count;67};68 69enum thunderbolt_ip_frame_pdf {70 TBIP_PDF_FRAME_START = 1,71 TBIP_PDF_FRAME_END,72};73 74enum thunderbolt_ip_type {75 TBIP_LOGIN,76 TBIP_LOGIN_RESPONSE,77 TBIP_LOGOUT,78 TBIP_STATUS,79};80 81struct thunderbolt_ip_header {82 u32 route_hi;83 u32 route_lo;84 u32 length_sn;85 uuid_t uuid;86 uuid_t initiator_uuid;87 uuid_t target_uuid;88 u32 type;89 u32 command_id;90};91 92#define TBIP_HDR_LENGTH_MASK GENMASK(5, 0)93#define TBIP_HDR_SN_MASK GENMASK(28, 27)94#define TBIP_HDR_SN_SHIFT 2795 96struct thunderbolt_ip_login {97 struct thunderbolt_ip_header hdr;98 u32 proto_version;99 u32 transmit_path;100 u32 reserved[4];101};102 103#define TBIP_LOGIN_PROTO_VERSION 1104 105struct thunderbolt_ip_login_response {106 struct thunderbolt_ip_header hdr;107 u32 status;108 u32 receiver_mac[2];109 u32 receiver_mac_len;110 u32 reserved[4];111};112 113struct thunderbolt_ip_logout {114 struct thunderbolt_ip_header hdr;115};116 117struct thunderbolt_ip_status {118 struct thunderbolt_ip_header hdr;119 u32 status;120};121 122struct tbnet_stats {123 u64 tx_packets;124 u64 rx_packets;125 u64 tx_bytes;126 u64 rx_bytes;127 u64 rx_errors;128 u64 tx_errors;129 u64 rx_length_errors;130 u64 rx_over_errors;131 u64 rx_crc_errors;132 u64 rx_missed_errors;133};134 135struct tbnet_frame {136 struct net_device *dev;137 struct page *page;138 struct ring_frame frame;139};140 141struct tbnet_ring {142 struct tbnet_frame frames[TBNET_RING_SIZE];143 unsigned int cons;144 unsigned int prod;145 struct tb_ring *ring;146};147 148/**149 * struct tbnet - ThunderboltIP network driver private data150 * @svc: XDomain service the driver is bound to151 * @xd: XDomain the service belongs to152 * @handler: ThunderboltIP configuration protocol handler153 * @dev: Networking device154 * @napi: NAPI structure for Rx polling155 * @stats: Network statistics156 * @skb: Network packet that is currently processed on Rx path157 * @command_id: ID used for next configuration protocol packet158 * @login_sent: ThunderboltIP login message successfully sent159 * @login_received: ThunderboltIP login message received from the remote160 * host161 * @local_transmit_path: HopID we are using to send out packets162 * @remote_transmit_path: HopID the other end is using to send packets to us163 * @connection_lock: Lock serializing access to @login_sent,164 * @login_received and @transmit_path.165 * @login_retries: Number of login retries currently done166 * @login_work: Worker to send ThunderboltIP login packets167 * @connected_work: Worker that finalizes the ThunderboltIP connection168 * setup and enables DMA paths for high speed data169 * transfers170 * @disconnect_work: Worker that handles tearing down the ThunderboltIP171 * connection172 * @rx_hdr: Copy of the currently processed Rx frame. Used when a173 * network packet consists of multiple Thunderbolt frames.174 * In host byte order.175 * @rx_ring: Software ring holding Rx frames176 * @frame_id: Frame ID use for next Tx packet177 * (if %TBNET_MATCH_FRAGS_ID is supported in both ends)178 * @tx_ring: Software ring holding Tx frames179 */180struct tbnet {181 const struct tb_service *svc;182 struct tb_xdomain *xd;183 struct tb_protocol_handler handler;184 struct net_device *dev;185 struct napi_struct napi;186 struct tbnet_stats stats;187 struct sk_buff *skb;188 atomic_t command_id;189 bool login_sent;190 bool login_received;191 int local_transmit_path;192 int remote_transmit_path;193 struct mutex connection_lock;194 int login_retries;195 struct delayed_work login_work;196 struct work_struct connected_work;197 struct work_struct disconnect_work;198 struct thunderbolt_ip_frame_header rx_hdr;199 struct tbnet_ring rx_ring;200 atomic_t frame_id;201 struct tbnet_ring tx_ring;202};203 204/* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */205static const uuid_t tbnet_dir_uuid =206 UUID_INIT(0xc66189ca, 0x1cce, 0x4195,207 0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f);208 209/* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */210static const uuid_t tbnet_svc_uuid =211 UUID_INIT(0x798f589e, 0x3616, 0x8a47,212 0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd);213 214static struct tb_property_dir *tbnet_dir;215 216static bool tbnet_e2e = true;217module_param_named(e2e, tbnet_e2e, bool, 0444);218MODULE_PARM_DESC(e2e, "USB4NET full end-to-end flow control (default: true)");219 220static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route,221 u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid,222 enum thunderbolt_ip_type type, size_t size, u32 command_id)223{224 u32 length_sn;225 226 /* Length does not include route_hi/lo and length_sn fields */227 length_sn = (size - 3 * 4) / 4;228 length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK;229 230 hdr->route_hi = upper_32_bits(route);231 hdr->route_lo = lower_32_bits(route);232 hdr->length_sn = length_sn;233 uuid_copy(&hdr->uuid, &tbnet_svc_uuid);234 uuid_copy(&hdr->initiator_uuid, initiator_uuid);235 uuid_copy(&hdr->target_uuid, target_uuid);236 hdr->type = type;237 hdr->command_id = command_id;238}239 240static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence,241 u32 command_id)242{243 struct thunderbolt_ip_login_response reply;244 struct tb_xdomain *xd = net->xd;245 246 memset(&reply, 0, sizeof(reply));247 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,248 xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply),249 command_id);250 memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN);251 reply.receiver_mac_len = ETH_ALEN;252 253 return tb_xdomain_response(xd, &reply, sizeof(reply),254 TB_CFG_PKG_XDOMAIN_RESP);255}256 257static int tbnet_login_request(struct tbnet *net, u8 sequence)258{259 struct thunderbolt_ip_login_response reply;260 struct thunderbolt_ip_login request;261 struct tb_xdomain *xd = net->xd;262 263 memset(&request, 0, sizeof(request));264 tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid,265 xd->remote_uuid, TBIP_LOGIN, sizeof(request),266 atomic_inc_return(&net->command_id));267 268 request.proto_version = TBIP_LOGIN_PROTO_VERSION;269 request.transmit_path = net->local_transmit_path;270 271 return tb_xdomain_request(xd, &request, sizeof(request),272 TB_CFG_PKG_XDOMAIN_RESP, &reply,273 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,274 TBNET_LOGIN_TIMEOUT);275}276 277static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence,278 u32 command_id)279{280 struct thunderbolt_ip_status reply;281 struct tb_xdomain *xd = net->xd;282 283 memset(&reply, 0, sizeof(reply));284 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,285 xd->remote_uuid, TBIP_STATUS, sizeof(reply),286 atomic_inc_return(&net->command_id));287 return tb_xdomain_response(xd, &reply, sizeof(reply),288 TB_CFG_PKG_XDOMAIN_RESP);289}290 291static int tbnet_logout_request(struct tbnet *net)292{293 struct thunderbolt_ip_logout request;294 struct thunderbolt_ip_status reply;295 struct tb_xdomain *xd = net->xd;296 297 memset(&request, 0, sizeof(request));298 tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid,299 xd->remote_uuid, TBIP_LOGOUT, sizeof(request),300 atomic_inc_return(&net->command_id));301 302 return tb_xdomain_request(xd, &request, sizeof(request),303 TB_CFG_PKG_XDOMAIN_RESP, &reply,304 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,305 TBNET_LOGOUT_TIMEOUT);306}307 308static void start_login(struct tbnet *net)309{310 netdev_dbg(net->dev, "login started\n");311 312 mutex_lock(&net->connection_lock);313 net->login_sent = false;314 net->login_received = false;315 mutex_unlock(&net->connection_lock);316 317 queue_delayed_work(system_long_wq, &net->login_work,318 msecs_to_jiffies(1000));319}320 321static void stop_login(struct tbnet *net)322{323 cancel_delayed_work_sync(&net->login_work);324 cancel_work_sync(&net->connected_work);325 326 netdev_dbg(net->dev, "login stopped\n");327}328 329static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf)330{331 return tf->frame.size ? : TBNET_FRAME_SIZE;332}333 334static void tbnet_free_buffers(struct tbnet_ring *ring)335{336 unsigned int i;337 338 for (i = 0; i < TBNET_RING_SIZE; i++) {339 struct device *dma_dev = tb_ring_dma_device(ring->ring);340 struct tbnet_frame *tf = &ring->frames[i];341 enum dma_data_direction dir;342 unsigned int order;343 size_t size;344 345 if (!tf->page)346 continue;347 348 if (ring->ring->is_tx) {349 dir = DMA_TO_DEVICE;350 order = 0;351 size = TBNET_FRAME_SIZE;352 } else {353 dir = DMA_FROM_DEVICE;354 order = TBNET_RX_PAGE_ORDER;355 size = TBNET_RX_PAGE_SIZE;356 }357 358 trace_tbnet_free_frame(i, tf->page, tf->frame.buffer_phy, dir);359 360 if (tf->frame.buffer_phy)361 dma_unmap_page(dma_dev, tf->frame.buffer_phy, size,362 dir);363 364 __free_pages(tf->page, order);365 tf->page = NULL;366 }367 368 ring->cons = 0;369 ring->prod = 0;370}371 372static void tbnet_tear_down(struct tbnet *net, bool send_logout)373{374 netif_carrier_off(net->dev);375 netif_stop_queue(net->dev);376 377 stop_login(net);378 379 mutex_lock(&net->connection_lock);380 381 if (net->login_sent && net->login_received) {382 int ret, retries = TBNET_LOGOUT_RETRIES;383 384 while (send_logout && retries-- > 0) {385 netdev_dbg(net->dev, "sending logout request %u\n",386 retries);387 ret = tbnet_logout_request(net);388 if (ret != -ETIMEDOUT)389 break;390 }391 392 tb_ring_stop(net->rx_ring.ring);393 tb_ring_stop(net->tx_ring.ring);394 tbnet_free_buffers(&net->rx_ring);395 tbnet_free_buffers(&net->tx_ring);396 397 ret = tb_xdomain_disable_paths(net->xd,398 net->local_transmit_path,399 net->rx_ring.ring->hop,400 net->remote_transmit_path,401 net->tx_ring.ring->hop);402 if (ret)403 netdev_warn(net->dev, "failed to disable DMA paths\n");404 405 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path);406 net->remote_transmit_path = 0;407 }408 409 net->login_retries = 0;410 net->login_sent = false;411 net->login_received = false;412 413 netdev_dbg(net->dev, "network traffic stopped\n");414 415 mutex_unlock(&net->connection_lock);416}417 418static int tbnet_handle_packet(const void *buf, size_t size, void *data)419{420 const struct thunderbolt_ip_login *pkg = buf;421 struct tbnet *net = data;422 u32 command_id;423 int ret = 0;424 u32 sequence;425 u64 route;426 427 /* Make sure the packet is for us */428 if (size < sizeof(struct thunderbolt_ip_header))429 return 0;430 if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid))431 return 0;432 if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid))433 return 0;434 435 route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo;436 route &= ~BIT_ULL(63);437 if (route != net->xd->route)438 return 0;439 440 sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK;441 sequence >>= TBIP_HDR_SN_SHIFT;442 command_id = pkg->hdr.command_id;443 444 switch (pkg->hdr.type) {445 case TBIP_LOGIN:446 netdev_dbg(net->dev, "remote login request received\n");447 if (!netif_running(net->dev))448 break;449 450 ret = tbnet_login_response(net, route, sequence,451 pkg->hdr.command_id);452 if (!ret) {453 netdev_dbg(net->dev, "remote login response sent\n");454 455 mutex_lock(&net->connection_lock);456 net->login_received = true;457 net->remote_transmit_path = pkg->transmit_path;458 459 /* If we reached the number of max retries or460 * previous logout, schedule another round of461 * login retries462 */463 if (net->login_retries >= TBNET_LOGIN_RETRIES ||464 !net->login_sent) {465 net->login_retries = 0;466 queue_delayed_work(system_long_wq,467 &net->login_work, 0);468 }469 mutex_unlock(&net->connection_lock);470 471 queue_work(system_long_wq, &net->connected_work);472 }473 break;474 475 case TBIP_LOGOUT:476 netdev_dbg(net->dev, "remote logout request received\n");477 ret = tbnet_logout_response(net, route, sequence, command_id);478 if (!ret) {479 netdev_dbg(net->dev, "remote logout response sent\n");480 queue_work(system_long_wq, &net->disconnect_work);481 }482 break;483 484 default:485 return 0;486 }487 488 if (ret)489 netdev_warn(net->dev, "failed to send ThunderboltIP response\n");490 491 return 1;492}493 494static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring)495{496 return ring->prod - ring->cons;497}498 499static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers)500{501 struct tbnet_ring *ring = &net->rx_ring;502 int ret;503 504 while (nbuffers--) {505 struct device *dma_dev = tb_ring_dma_device(ring->ring);506 unsigned int index = ring->prod & (TBNET_RING_SIZE - 1);507 struct tbnet_frame *tf = &ring->frames[index];508 dma_addr_t dma_addr;509 510 if (tf->page)511 break;512 513 /* Allocate page (order > 0) so that it can hold maximum514 * ThunderboltIP frame (4kB) and the additional room for515 * SKB shared info required by build_skb().516 */517 tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER);518 if (!tf->page) {519 ret = -ENOMEM;520 goto err_free;521 }522 523 dma_addr = dma_map_page(dma_dev, tf->page, 0,524 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);525 if (dma_mapping_error(dma_dev, dma_addr)) {526 ret = -ENOMEM;527 goto err_free;528 }529 530 tf->frame.buffer_phy = dma_addr;531 tf->dev = net->dev;532 533 trace_tbnet_alloc_rx_frame(index, tf->page, dma_addr,534 DMA_FROM_DEVICE);535 536 tb_ring_rx(ring->ring, &tf->frame);537 538 ring->prod++;539 }540 541 return 0;542 543err_free:544 tbnet_free_buffers(ring);545 return ret;546}547 548static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net)549{550 struct tbnet_ring *ring = &net->tx_ring;551 struct device *dma_dev = tb_ring_dma_device(ring->ring);552 struct tbnet_frame *tf;553 unsigned int index;554 555 if (!tbnet_available_buffers(ring))556 return NULL;557 558 index = ring->cons++ & (TBNET_RING_SIZE - 1);559 560 tf = &ring->frames[index];561 tf->frame.size = 0;562 563 dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy,564 tbnet_frame_size(tf), DMA_TO_DEVICE);565 566 return tf;567}568 569static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame,570 bool canceled)571{572 struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame);573 struct tbnet *net = netdev_priv(tf->dev);574 575 /* Return buffer to the ring */576 net->tx_ring.prod++;577 578 if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2)579 netif_wake_queue(net->dev);580}581 582static int tbnet_alloc_tx_buffers(struct tbnet *net)583{584 struct tbnet_ring *ring = &net->tx_ring;585 struct device *dma_dev = tb_ring_dma_device(ring->ring);586 unsigned int i;587 588 for (i = 0; i < TBNET_RING_SIZE; i++) {589 struct tbnet_frame *tf = &ring->frames[i];590 dma_addr_t dma_addr;591 592 tf->page = alloc_page(GFP_KERNEL);593 if (!tf->page) {594 tbnet_free_buffers(ring);595 return -ENOMEM;596 }597 598 dma_addr = dma_map_page(dma_dev, tf->page, 0, TBNET_FRAME_SIZE,599 DMA_TO_DEVICE);600 if (dma_mapping_error(dma_dev, dma_addr)) {601 __free_page(tf->page);602 tf->page = NULL;603 tbnet_free_buffers(ring);604 return -ENOMEM;605 }606 607 tf->dev = net->dev;608 tf->frame.buffer_phy = dma_addr;609 tf->frame.callback = tbnet_tx_callback;610 tf->frame.sof = TBIP_PDF_FRAME_START;611 tf->frame.eof = TBIP_PDF_FRAME_END;612 613 trace_tbnet_alloc_tx_frame(i, tf->page, dma_addr, DMA_TO_DEVICE);614 }615 616 ring->cons = 0;617 ring->prod = TBNET_RING_SIZE - 1;618 619 return 0;620}621 622static void tbnet_connected_work(struct work_struct *work)623{624 struct tbnet *net = container_of(work, typeof(*net), connected_work);625 bool connected;626 int ret;627 628 if (netif_carrier_ok(net->dev))629 return;630 631 mutex_lock(&net->connection_lock);632 connected = net->login_sent && net->login_received;633 mutex_unlock(&net->connection_lock);634 635 if (!connected)636 return;637 638 netdev_dbg(net->dev, "login successful, enabling paths\n");639 640 ret = tb_xdomain_alloc_in_hopid(net->xd, net->remote_transmit_path);641 if (ret != net->remote_transmit_path) {642 netdev_err(net->dev, "failed to allocate Rx HopID\n");643 return;644 }645 646 /* Both logins successful so enable the rings, high-speed DMA647 * paths and start the network device queue.648 *649 * Note we enable the DMA paths last to make sure we have primed650 * the Rx ring before any incoming packets are allowed to651 * arrive.652 */653 tb_ring_start(net->tx_ring.ring);654 tb_ring_start(net->rx_ring.ring);655 656 ret = tbnet_alloc_rx_buffers(net, TBNET_RING_SIZE);657 if (ret)658 goto err_stop_rings;659 660 ret = tbnet_alloc_tx_buffers(net);661 if (ret)662 goto err_free_rx_buffers;663 664 ret = tb_xdomain_enable_paths(net->xd, net->local_transmit_path,665 net->rx_ring.ring->hop,666 net->remote_transmit_path,667 net->tx_ring.ring->hop);668 if (ret) {669 netdev_err(net->dev, "failed to enable DMA paths\n");670 goto err_free_tx_buffers;671 }672 673 netif_carrier_on(net->dev);674 netif_start_queue(net->dev);675 676 netdev_dbg(net->dev, "network traffic started\n");677 return;678 679err_free_tx_buffers:680 tbnet_free_buffers(&net->tx_ring);681err_free_rx_buffers:682 tbnet_free_buffers(&net->rx_ring);683err_stop_rings:684 tb_ring_stop(net->rx_ring.ring);685 tb_ring_stop(net->tx_ring.ring);686 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path);687}688 689static void tbnet_login_work(struct work_struct *work)690{691 struct tbnet *net = container_of(work, typeof(*net), login_work.work);692 unsigned long delay = msecs_to_jiffies(TBNET_LOGIN_DELAY);693 int ret;694 695 if (netif_carrier_ok(net->dev))696 return;697 698 netdev_dbg(net->dev, "sending login request, retries=%u\n",699 net->login_retries);700 701 ret = tbnet_login_request(net, net->login_retries % 4);702 if (ret) {703 netdev_dbg(net->dev, "sending login request failed, ret=%d\n",704 ret);705 if (net->login_retries++ < TBNET_LOGIN_RETRIES) {706 queue_delayed_work(system_long_wq, &net->login_work,707 delay);708 } else {709 netdev_info(net->dev, "ThunderboltIP login timed out\n");710 }711 } else {712 netdev_dbg(net->dev, "received login reply\n");713 714 net->login_retries = 0;715 716 mutex_lock(&net->connection_lock);717 net->login_sent = true;718 mutex_unlock(&net->connection_lock);719 720 queue_work(system_long_wq, &net->connected_work);721 }722}723 724static void tbnet_disconnect_work(struct work_struct *work)725{726 struct tbnet *net = container_of(work, typeof(*net), disconnect_work);727 728 tbnet_tear_down(net, false);729}730 731static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf,732 const struct thunderbolt_ip_frame_header *hdr)733{734 u32 frame_id, frame_count, frame_size, frame_index;735 unsigned int size;736 737 if (tf->frame.flags & RING_DESC_CRC_ERROR) {738 net->stats.rx_crc_errors++;739 return false;740 } else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) {741 net->stats.rx_over_errors++;742 return false;743 }744 745 /* Should be greater than just header i.e. contains data */746 size = tbnet_frame_size(tf);747 if (size <= sizeof(*hdr)) {748 net->stats.rx_length_errors++;749 return false;750 }751 752 frame_count = le32_to_cpu(hdr->frame_count);753 frame_size = le32_to_cpu(hdr->frame_size);754 frame_index = le16_to_cpu(hdr->frame_index);755 frame_id = le16_to_cpu(hdr->frame_id);756 757 if ((frame_size > size - sizeof(*hdr)) || !frame_size) {758 net->stats.rx_length_errors++;759 return false;760 }761 762 /* In case we're in the middle of packet, validate the frame763 * header based on first fragment of the packet.764 */765 if (net->skb && net->rx_hdr.frame_count) {766 /* Check the frame count fits the count field */767 if (frame_count != le32_to_cpu(net->rx_hdr.frame_count)) {768 net->stats.rx_length_errors++;769 return false;770 }771 772 /* Check the frame identifiers are incremented correctly,773 * and id is matching.774 */775 if (frame_index != le16_to_cpu(net->rx_hdr.frame_index) + 1 ||776 frame_id != le16_to_cpu(net->rx_hdr.frame_id)) {777 net->stats.rx_missed_errors++;778 return false;779 }780 781 if (net->skb->len + frame_size > TBNET_MAX_MTU) {782 net->stats.rx_length_errors++;783 return false;784 }785 786 return true;787 }788 789 /* Start of packet, validate the frame header */790 if (frame_count == 0 || frame_count > TBNET_RING_SIZE / 4) {791 net->stats.rx_length_errors++;792 return false;793 }794 if (frame_index != 0) {795 net->stats.rx_missed_errors++;796 return false;797 }798 799 return true;800}801 802static int tbnet_poll(struct napi_struct *napi, int budget)803{804 struct tbnet *net = container_of(napi, struct tbnet, napi);805 unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring);806 struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring);807 unsigned int rx_packets = 0;808 809 while (rx_packets < budget) {810 const struct thunderbolt_ip_frame_header *hdr;811 unsigned int hdr_size = sizeof(*hdr);812 struct sk_buff *skb = NULL;813 struct ring_frame *frame;814 struct tbnet_frame *tf;815 struct page *page;816 bool last = true;817 u32 frame_size;818 819 /* Return some buffers to hardware, one at a time is too820 * slow so allocate MAX_SKB_FRAGS buffers at the same821 * time.822 */823 if (cleaned_count >= MAX_SKB_FRAGS) {824 tbnet_alloc_rx_buffers(net, cleaned_count);825 cleaned_count = 0;826 }827 828 frame = tb_ring_poll(net->rx_ring.ring);829 if (!frame)830 break;831 832 dma_unmap_page(dma_dev, frame->buffer_phy,833 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);834 835 tf = container_of(frame, typeof(*tf), frame);836 837 page = tf->page;838 tf->page = NULL;839 net->rx_ring.cons++;840 cleaned_count++;841 842 hdr = page_address(page);843 if (!tbnet_check_frame(net, tf, hdr)) {844 trace_tbnet_invalid_rx_ip_frame(hdr->frame_size,845 hdr->frame_id, hdr->frame_index, hdr->frame_count);846 __free_pages(page, TBNET_RX_PAGE_ORDER);847 dev_kfree_skb_any(net->skb);848 net->skb = NULL;849 continue;850 }851 852 trace_tbnet_rx_ip_frame(hdr->frame_size, hdr->frame_id,853 hdr->frame_index, hdr->frame_count);854 frame_size = le32_to_cpu(hdr->frame_size);855 856 skb = net->skb;857 if (!skb) {858 skb = build_skb(page_address(page),859 TBNET_RX_PAGE_SIZE);860 if (!skb) {861 __free_pages(page, TBNET_RX_PAGE_ORDER);862 net->stats.rx_errors++;863 break;864 }865 866 skb_reserve(skb, hdr_size);867 skb_put(skb, frame_size);868 869 net->skb = skb;870 } else {871 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,872 page, hdr_size, frame_size,873 TBNET_RX_PAGE_SIZE - hdr_size);874 }875 876 net->rx_hdr.frame_size = hdr->frame_size;877 net->rx_hdr.frame_count = hdr->frame_count;878 net->rx_hdr.frame_index = hdr->frame_index;879 net->rx_hdr.frame_id = hdr->frame_id;880 last = le16_to_cpu(net->rx_hdr.frame_index) ==881 le32_to_cpu(net->rx_hdr.frame_count) - 1;882 883 rx_packets++;884 net->stats.rx_bytes += frame_size;885 886 if (last) {887 skb->protocol = eth_type_trans(skb, net->dev);888 trace_tbnet_rx_skb(skb);889 napi_gro_receive(&net->napi, skb);890 net->skb = NULL;891 }892 }893 894 net->stats.rx_packets += rx_packets;895 896 if (cleaned_count)897 tbnet_alloc_rx_buffers(net, cleaned_count);898 899 if (rx_packets >= budget)900 return budget;901 902 napi_complete_done(napi, rx_packets);903 /* Re-enable the ring interrupt */904 tb_ring_poll_complete(net->rx_ring.ring);905 906 return rx_packets;907}908 909static void tbnet_start_poll(void *data)910{911 struct tbnet *net = data;912 913 napi_schedule(&net->napi);914}915 916static int tbnet_open(struct net_device *dev)917{918 struct tbnet *net = netdev_priv(dev);919 struct tb_xdomain *xd = net->xd;920 u16 sof_mask, eof_mask;921 struct tb_ring *ring;922 unsigned int flags;923 int hopid;924 925 netif_carrier_off(dev);926 927 ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE,928 RING_FLAG_FRAME);929 if (!ring) {930 netdev_err(dev, "failed to allocate Tx ring\n");931 return -ENOMEM;932 }933 net->tx_ring.ring = ring;934 935 hopid = tb_xdomain_alloc_out_hopid(xd, -1);936 if (hopid < 0) {937 netdev_err(dev, "failed to allocate Tx HopID\n");938 tb_ring_free(net->tx_ring.ring);939 net->tx_ring.ring = NULL;940 return hopid;941 }942 net->local_transmit_path = hopid;943 944 sof_mask = BIT(TBIP_PDF_FRAME_START);945 eof_mask = BIT(TBIP_PDF_FRAME_END);946 947 flags = RING_FLAG_FRAME;948 /* Only enable full E2E if the other end supports it too */949 if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E)950 flags |= RING_FLAG_E2E;951 952 ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags,953 net->tx_ring.ring->hop, sof_mask,954 eof_mask, tbnet_start_poll, net);955 if (!ring) {956 netdev_err(dev, "failed to allocate Rx ring\n");957 tb_xdomain_release_out_hopid(xd, hopid);958 tb_ring_free(net->tx_ring.ring);959 net->tx_ring.ring = NULL;960 return -ENOMEM;961 }962 net->rx_ring.ring = ring;963 964 napi_enable(&net->napi);965 start_login(net);966 967 return 0;968}969 970static int tbnet_stop(struct net_device *dev)971{972 struct tbnet *net = netdev_priv(dev);973 974 napi_disable(&net->napi);975 976 cancel_work_sync(&net->disconnect_work);977 tbnet_tear_down(net, true);978 979 tb_ring_free(net->rx_ring.ring);980 net->rx_ring.ring = NULL;981 982 tb_xdomain_release_out_hopid(net->xd, net->local_transmit_path);983 tb_ring_free(net->tx_ring.ring);984 net->tx_ring.ring = NULL;985 986 return 0;987}988 989static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,990 struct tbnet_frame **frames, u32 frame_count)991{992 struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page);993 struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring);994 unsigned int i, len, offset = skb_transport_offset(skb);995 /* Remove payload length from checksum */996 u32 paylen = skb->len - skb_transport_offset(skb);997 __wsum wsum = (__force __wsum)htonl(paylen);998 __be16 protocol = skb->protocol;999 void *data = skb->data;1000 void *dest = hdr + 1;1001 __sum16 *tucso;1002 1003 if (skb->ip_summed != CHECKSUM_PARTIAL) {1004 /* No need to calculate checksum so we just update the1005 * total frame count and sync the frames for DMA.1006 */1007 for (i = 0; i < frame_count; i++) {1008 hdr = page_address(frames[i]->page);1009 hdr->frame_count = cpu_to_le32(frame_count);1010 trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id,1011 hdr->frame_index, hdr->frame_count);1012 dma_sync_single_for_device(dma_dev,1013 frames[i]->frame.buffer_phy,1014 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);1015 }1016 1017 return true;1018 }1019 1020 if (protocol == htons(ETH_P_8021Q)) {1021 struct vlan_hdr *vhdr, vh;1022 1023 vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh);1024 if (!vhdr)1025 return false;1026 1027 protocol = vhdr->h_vlan_encapsulated_proto;1028 }1029 1030 /* Data points on the beginning of packet.1031 * Check is the checksum absolute place in the packet.1032 * ipcso will update IP checksum.1033 * tucso will update TCP/UDP checksum.1034 */1035 if (protocol == htons(ETH_P_IP)) {1036 __sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data);1037 1038 *ipcso = 0;1039 *ipcso = ip_fast_csum(dest + skb_network_offset(skb),1040 ip_hdr(skb)->ihl);1041 1042 if (ip_hdr(skb)->protocol == IPPROTO_TCP)1043 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);1044 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)1045 tucso = dest + ((void *)&(udp_hdr(skb)->check) - data);1046 else1047 return false;1048 1049 *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,1050 ip_hdr(skb)->daddr, 0,1051 ip_hdr(skb)->protocol, 0);1052 } else if (skb_is_gso(skb) && skb_is_gso_v6(skb)) {1053 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);1054 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,1055 &ipv6_hdr(skb)->daddr, 0,1056 IPPROTO_TCP, 0);1057 } else if (protocol == htons(ETH_P_IPV6)) {1058 tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset;1059 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,1060 &ipv6_hdr(skb)->daddr, 0,1061 ipv6_hdr(skb)->nexthdr, 0);1062 } else {1063 return false;1064 }1065 1066 /* First frame was headers, rest of the frames contain data.1067 * Calculate checksum over each frame.1068 */1069 for (i = 0; i < frame_count; i++) {1070 hdr = page_address(frames[i]->page);1071 dest = (void *)(hdr + 1) + offset;1072 len = le32_to_cpu(hdr->frame_size) - offset;1073 wsum = csum_partial(dest, len, wsum);1074 hdr->frame_count = cpu_to_le32(frame_count);1075 trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id,1076 hdr->frame_index, hdr->frame_count);1077 1078 offset = 0;1079 }1080 1081 *tucso = csum_fold(wsum);1082 1083 /* Checksum is finally calculated and we don't touch the memory1084 * anymore, so DMA sync the frames now.1085 */1086 for (i = 0; i < frame_count; i++) {1087 dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy,1088 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);1089 }1090 1091 return true;1092}1093 1094static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num,1095 unsigned int *len)1096{1097 const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num];1098 1099 *len = skb_frag_size(frag);1100 return kmap_local_page(skb_frag_page(frag)) + skb_frag_off(frag);1101}1102 1103static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,1104 struct net_device *dev)1105{1106 struct tbnet *net = netdev_priv(dev);1107 struct tbnet_frame *frames[MAX_SKB_FRAGS];1108 u16 frame_id = atomic_read(&net->frame_id);1109 struct thunderbolt_ip_frame_header *hdr;1110 unsigned int len = skb_headlen(skb);1111 unsigned int data_len = skb->len;1112 unsigned int nframes, i;1113 unsigned int frag = 0;1114 void *src = skb->data;1115 u32 frame_index = 0;1116 bool unmap = false;1117 void *dest;1118 1119 trace_tbnet_tx_skb(skb);1120 1121 nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE);1122 if (tbnet_available_buffers(&net->tx_ring) < nframes) {1123 netif_stop_queue(net->dev);1124 return NETDEV_TX_BUSY;1125 }1126 1127 frames[frame_index] = tbnet_get_tx_buffer(net);1128 if (!frames[frame_index])1129 goto err_drop;1130 1131 hdr = page_address(frames[frame_index]->page);1132 dest = hdr + 1;1133 1134 /* If overall packet is bigger than the frame data size */1135 while (data_len > TBNET_MAX_PAYLOAD_SIZE) {1136 unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE;1137 1138 hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE);1139 hdr->frame_index = cpu_to_le16(frame_index);1140 hdr->frame_id = cpu_to_le16(frame_id);1141 1142 do {1143 if (len > size_left) {1144 /* Copy data onto Tx buffer data with1145 * full frame size then break and go to1146 * next frame1147 */1148 memcpy(dest, src, size_left);1149 len -= size_left;1150 dest += size_left;1151 src += size_left;1152 break;1153 }1154 1155 memcpy(dest, src, len);1156 size_left -= len;1157 dest += len;1158 1159 if (unmap) {1160 kunmap_local(src);1161 unmap = false;1162 }1163 1164 /* Ensure all fragments have been processed */1165 if (frag < skb_shinfo(skb)->nr_frags) {1166 /* Map and then unmap quickly */1167 src = tbnet_kmap_frag(skb, frag++, &len);1168 unmap = true;1169 } else if (unlikely(size_left > 0)) {1170 goto err_drop;1171 }1172 } while (size_left > 0);1173 1174 data_len -= TBNET_MAX_PAYLOAD_SIZE;1175 frame_index++;1176 1177 frames[frame_index] = tbnet_get_tx_buffer(net);1178 if (!frames[frame_index])1179 goto err_drop;1180 1181 hdr = page_address(frames[frame_index]->page);1182 dest = hdr + 1;1183 }1184 1185 hdr->frame_size = cpu_to_le32(data_len);1186 hdr->frame_index = cpu_to_le16(frame_index);1187 hdr->frame_id = cpu_to_le16(frame_id);1188 1189 frames[frame_index]->frame.size = data_len + sizeof(*hdr);1190 1191 /* In case the remaining data_len is smaller than a frame */1192 while (len < data_len) {1193 memcpy(dest, src, len);1194 data_len -= len;1195 dest += len;1196 1197 if (unmap) {1198 kunmap_local(src);1199 unmap = false;1200 }1201 1202 if (frag < skb_shinfo(skb)->nr_frags) {1203 src = tbnet_kmap_frag(skb, frag++, &len);1204 unmap = true;1205 } else if (unlikely(data_len > 0)) {1206 goto err_drop;1207 }1208 }1209 1210 memcpy(dest, src, data_len);1211 1212 if (unmap)1213 kunmap_local(src);1214 1215 if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1))1216 goto err_drop;1217 1218 for (i = 0; i < frame_index + 1; i++)1219 tb_ring_tx(net->tx_ring.ring, &frames[i]->frame);1220 1221 if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID)1222 atomic_inc(&net->frame_id);1223 1224 net->stats.tx_packets++;1225 net->stats.tx_bytes += skb->len;1226 1227 trace_tbnet_consume_skb(skb);1228 dev_consume_skb_any(skb);1229 1230 return NETDEV_TX_OK;1231 1232err_drop:1233 /* We can re-use the buffers */1234 net->tx_ring.cons -= frame_index;1235 1236 dev_kfree_skb_any(skb);1237 net->stats.tx_errors++;1238 1239 return NETDEV_TX_OK;1240}1241 1242static void tbnet_get_stats64(struct net_device *dev,1243 struct rtnl_link_stats64 *stats)1244{1245 struct tbnet *net = netdev_priv(dev);1246 1247 stats->tx_packets = net->stats.tx_packets;1248 stats->rx_packets = net->stats.rx_packets;1249 stats->tx_bytes = net->stats.tx_bytes;1250 stats->rx_bytes = net->stats.rx_bytes;1251 stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors +1252 net->stats.rx_over_errors + net->stats.rx_crc_errors +1253 net->stats.rx_missed_errors;1254 stats->tx_errors = net->stats.tx_errors;1255 stats->rx_length_errors = net->stats.rx_length_errors;1256 stats->rx_over_errors = net->stats.rx_over_errors;1257 stats->rx_crc_errors = net->stats.rx_crc_errors;1258 stats->rx_missed_errors = net->stats.rx_missed_errors;1259}1260 1261static const struct net_device_ops tbnet_netdev_ops = {1262 .ndo_open = tbnet_open,1263 .ndo_stop = tbnet_stop,1264 .ndo_start_xmit = tbnet_start_xmit,1265 .ndo_get_stats64 = tbnet_get_stats64,1266};1267 1268static void tbnet_generate_mac(struct net_device *dev)1269{1270 const struct tbnet *net = netdev_priv(dev);1271 const struct tb_xdomain *xd = net->xd;1272 u8 addr[ETH_ALEN];1273 u8 phy_port;1274 u32 hash;1275 1276 phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route));1277 1278 /* Unicast and locally administered MAC */1279 addr[0] = phy_port << 4 | 0x02;1280 hash = jhash2((u32 *)xd->local_uuid, 4, 0);1281 memcpy(addr + 1, &hash, sizeof(hash));1282 hash = jhash2((u32 *)xd->local_uuid, 4, hash);1283 addr[5] = hash & 0xff;1284 eth_hw_addr_set(dev, addr);1285}1286 1287static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id)1288{1289 struct tb_xdomain *xd = tb_service_parent(svc);1290 struct net_device *dev;1291 struct tbnet *net;1292 int ret;1293 1294 dev = alloc_etherdev(sizeof(*net));1295 if (!dev)1296 return -ENOMEM;1297 1298 SET_NETDEV_DEV(dev, &svc->dev);1299 1300 net = netdev_priv(dev);1301 INIT_DELAYED_WORK(&net->login_work, tbnet_login_work);1302 INIT_WORK(&net->connected_work, tbnet_connected_work);1303 INIT_WORK(&net->disconnect_work, tbnet_disconnect_work);1304 mutex_init(&net->connection_lock);1305 atomic_set(&net->command_id, 0);1306 atomic_set(&net->frame_id, 0);1307 net->svc = svc;1308 net->dev = dev;1309 net->xd = xd;1310 1311 tbnet_generate_mac(dev);1312 1313 strcpy(dev->name, "thunderbolt%d");1314 dev->netdev_ops = &tbnet_netdev_ops;1315 1316 /* ThunderboltIP takes advantage of TSO packets but instead of1317 * segmenting them we just split the packet into Thunderbolt1318 * frames (maximum payload size of each frame is 4084 bytes) and1319 * calculate checksum over the whole packet here.1320 *1321 * The receiving side does the opposite if the host OS supports1322 * LRO, otherwise it needs to split the large packet into MTU1323 * sized smaller packets.1324 *1325 * In order to receive large packets from the networking stack,1326 * we need to announce support for most of the offloading1327 * features here.1328 */1329 dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO |1330 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;1331 dev->features = dev->hw_features | NETIF_F_HIGHDMA;1332 dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header);1333 1334 netif_napi_add(dev, &net->napi, tbnet_poll);1335 1336 /* MTU range: 68 - 65522 */1337 dev->min_mtu = ETH_MIN_MTU;1338 dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN;1339 1340 net->handler.uuid = &tbnet_svc_uuid;1341 net->handler.callback = tbnet_handle_packet;1342 net->handler.data = net;1343 tb_register_protocol_handler(&net->handler);1344 1345 tb_service_set_drvdata(svc, net);1346 1347 ret = register_netdev(dev);1348 if (ret) {1349 tb_unregister_protocol_handler(&net->handler);1350 free_netdev(dev);1351 return ret;1352 }1353 1354 return 0;1355}1356 1357static void tbnet_remove(struct tb_service *svc)1358{1359 struct tbnet *net = tb_service_get_drvdata(svc);1360 1361 unregister_netdev(net->dev);1362 tb_unregister_protocol_handler(&net->handler);1363 free_netdev(net->dev);1364}1365 1366static void tbnet_shutdown(struct tb_service *svc)1367{1368 tbnet_tear_down(tb_service_get_drvdata(svc), true);1369}1370 1371static int tbnet_suspend(struct device *dev)1372{1373 struct tb_service *svc = tb_to_service(dev);1374 struct tbnet *net = tb_service_get_drvdata(svc);1375 1376 stop_login(net);1377 if (netif_running(net->dev)) {1378 netif_device_detach(net->dev);1379 tbnet_tear_down(net, true);1380 }1381 1382 tb_unregister_protocol_handler(&net->handler);1383 return 0;1384}1385 1386static int tbnet_resume(struct device *dev)1387{1388 struct tb_service *svc = tb_to_service(dev);1389 struct tbnet *net = tb_service_get_drvdata(svc);1390 1391 tb_register_protocol_handler(&net->handler);1392 1393 netif_carrier_off(net->dev);1394 if (netif_running(net->dev)) {1395 netif_device_attach(net->dev);1396 start_login(net);1397 }1398 1399 return 0;1400}1401 1402static DEFINE_SIMPLE_DEV_PM_OPS(tbnet_pm_ops, tbnet_suspend, tbnet_resume);1403 1404static const struct tb_service_id tbnet_ids[] = {1405 { TB_SERVICE("network", 1) },1406 { },1407};1408MODULE_DEVICE_TABLE(tbsvc, tbnet_ids);1409 1410static struct tb_service_driver tbnet_driver = {1411 .driver = {1412 .owner = THIS_MODULE,1413 .name = "thunderbolt-net",1414 .pm = pm_sleep_ptr(&tbnet_pm_ops),1415 },1416 .probe = tbnet_probe,1417 .remove = tbnet_remove,1418 .shutdown = tbnet_shutdown,1419 .id_table = tbnet_ids,1420};1421 1422static int __init tbnet_init(void)1423{1424 unsigned int flags;1425 int ret;1426 1427 tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid);1428 if (!tbnet_dir)1429 return -ENOMEM;1430 1431 tb_property_add_immediate(tbnet_dir, "prtcid", 1);1432 tb_property_add_immediate(tbnet_dir, "prtcvers", 1);1433 tb_property_add_immediate(tbnet_dir, "prtcrevs", 1);1434 1435 flags = TBNET_MATCH_FRAGS_ID | TBNET_64K_FRAMES;1436 if (tbnet_e2e)1437 flags |= TBNET_E2E;1438 tb_property_add_immediate(tbnet_dir, "prtcstns", flags);1439 1440 ret = tb_register_property_dir("network", tbnet_dir);1441 if (ret)1442 goto err_free_dir;1443 1444 ret = tb_register_service_driver(&tbnet_driver);1445 if (ret)1446 goto err_unregister;1447 1448 return 0;1449 1450err_unregister:1451 tb_unregister_property_dir("network", tbnet_dir);1452err_free_dir:1453 tb_property_free_dir(tbnet_dir);1454 1455 return ret;1456}1457module_init(tbnet_init);1458 1459static void __exit tbnet_exit(void)1460{1461 tb_unregister_service_driver(&tbnet_driver);1462 tb_unregister_property_dir("network", tbnet_dir);1463 tb_property_free_dir(tbnet_dir);1464}1465module_exit(tbnet_exit);1466 1467MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>");1468MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>");1469MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");1470MODULE_DESCRIPTION("Thunderbolt/USB4 network driver");1471MODULE_LICENSE("GPL v2");1472