1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Networking over Thunderbolt/USB4 cables using USB4NET protocol 4 * (formerly Apple ThunderboltIP). 5 * 6 * Copyright (C) 2017, Intel Corporation 7 * 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/ethtool.h> 14 #include <linux/highmem.h> 15 #include <linux/if_vlan.h> 16 #include <linux/jhash.h> 17 #include <linux/module.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/sizes.h> 21 #include <linux/thunderbolt.h> 22 #include <linux/uuid.h> 23 #include <linux/workqueue.h> 24 25 #include <net/ip6_checksum.h> 26 27 #include "trace.h" 28 29 /* Protocol timeouts in ms */ 30 #define TBNET_LOGIN_DELAY 4500 31 #define TBNET_LOGIN_TIMEOUT 500 32 #define TBNET_LOGOUT_TIMEOUT 1000 33 34 #define TBNET_RING_SIZE 256 35 #define TBNET_LOGIN_RETRIES 60 36 #define TBNET_LOGOUT_RETRIES 10 37 #define TBNET_THROTTLING 128000 38 #define TBNET_E2E BIT(0) 39 #define TBNET_MATCH_FRAGS_ID BIT(1) 40 #define TBNET_64K_FRAMES BIT(2) 41 #define TBNET_MAX_MTU SZ_64K 42 #define TBNET_FRAME_SIZE TB_MAX_FRAME_SIZE 43 #define TBNET_MAX_PAYLOAD_SIZE \ 44 (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header)) 45 /* Rx packets need to hold space for skb_shared_info */ 46 #define TBNET_RX_MAX_SIZE \ 47 (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 48 #define TBNET_RX_PAGE_ORDER get_order(TBNET_RX_MAX_SIZE) 49 #define TBNET_RX_PAGE_SIZE (PAGE_SIZE << TBNET_RX_PAGE_ORDER) 50 51 #define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0)) 52 53 /** 54 * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame 55 * @frame_size: size of the data with the frame 56 * @frame_index: running index on the frames 57 * @frame_id: ID of the frame to match frames to specific packet 58 * @frame_count: how many frames assembles a full packet 59 * 60 * Each data frame passed to the high-speed DMA ring has this header. If 61 * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is 62 * supported then @frame_id is filled, otherwise it stays %0. 63 */ 64 struct thunderbolt_ip_frame_header { 65 __le32 frame_size; 66 __le16 frame_index; 67 __le16 frame_id; 68 __le32 frame_count; 69 }; 70 71 enum thunderbolt_ip_frame_pdf { 72 TBIP_PDF_FRAME_START = 1, 73 TBIP_PDF_FRAME_END, 74 }; 75 76 enum thunderbolt_ip_type { 77 TBIP_LOGIN, 78 TBIP_LOGIN_RESPONSE, 79 TBIP_LOGOUT, 80 TBIP_STATUS, 81 }; 82 83 struct thunderbolt_ip_header { 84 u32 route_hi; 85 u32 route_lo; 86 u32 length_sn; 87 uuid_t uuid; 88 uuid_t initiator_uuid; 89 uuid_t target_uuid; 90 u32 type; 91 u32 command_id; 92 }; 93 94 #define TBIP_HDR_LENGTH_MASK GENMASK(5, 0) 95 #define TBIP_HDR_SN_MASK GENMASK(28, 27) 96 #define TBIP_HDR_SN_SHIFT 27 97 98 struct thunderbolt_ip_login { 99 struct thunderbolt_ip_header hdr; 100 u32 proto_version; 101 u32 transmit_path; 102 u32 reserved[4]; 103 }; 104 105 #define TBIP_LOGIN_PROTO_VERSION 1 106 107 struct thunderbolt_ip_login_response { 108 struct thunderbolt_ip_header hdr; 109 u32 status; 110 u32 receiver_mac[2]; 111 u32 receiver_mac_len; 112 u32 reserved[4]; 113 }; 114 115 struct thunderbolt_ip_logout { 116 struct thunderbolt_ip_header hdr; 117 }; 118 119 struct thunderbolt_ip_status { 120 struct thunderbolt_ip_header hdr; 121 u32 status; 122 }; 123 124 struct tbnet_stats { 125 u64 tx_packets; 126 u64 rx_packets; 127 u64 tx_bytes; 128 u64 rx_bytes; 129 u64 rx_errors; 130 u64 tx_errors; 131 u64 rx_length_errors; 132 u64 rx_over_errors; 133 u64 rx_crc_errors; 134 u64 rx_missed_errors; 135 }; 136 137 struct tbnet_frame { 138 struct net_device *dev; 139 struct page *page; 140 struct ring_frame frame; 141 }; 142 143 struct tbnet_ring { 144 struct tbnet_frame frames[TBNET_RING_SIZE]; 145 unsigned int cons; 146 unsigned int prod; 147 struct tb_ring *ring; 148 }; 149 150 /** 151 * struct tbnet - ThunderboltIP network driver private data 152 * @svc: XDomain service the driver is bound to 153 * @xd: XDomain the service belongs to 154 * @handler: ThunderboltIP configuration protocol handler 155 * @dev: Networking device 156 * @napi: NAPI structure for Rx polling 157 * @stats: Network statistics 158 * @skb: Network packet that is currently processed on Rx path 159 * @command_id: ID used for next configuration protocol packet 160 * @login_sent: ThunderboltIP login message successfully sent 161 * @login_received: ThunderboltIP login message received from the remote 162 * host 163 * @local_transmit_path: HopID we are using to send out packets 164 * @remote_transmit_path: HopID the other end is using to send packets to us 165 * @connection_lock: Lock serializing access to @login_sent, 166 * @login_received and @transmit_path. 167 * @login_retries: Number of login retries currently done 168 * @login_work: Worker to send ThunderboltIP login packets 169 * @connected_work: Worker that finalizes the ThunderboltIP connection 170 * setup and enables DMA paths for high speed data 171 * transfers 172 * @disconnect_work: Worker that handles tearing down the ThunderboltIP 173 * connection 174 * @rx_hdr: Copy of the currently processed Rx frame. Used when a 175 * network packet consists of multiple Thunderbolt frames. 176 * In host byte order. 177 * @rx_ring: Software ring holding Rx frames 178 * @frame_id: Frame ID use for next Tx packet 179 * (if %TBNET_MATCH_FRAGS_ID is supported in both ends) 180 * @tx_ring: Software ring holding Tx frames 181 */ 182 struct tbnet { 183 const struct tb_service *svc; 184 struct tb_xdomain *xd; 185 struct tb_protocol_handler handler; 186 struct net_device *dev; 187 struct napi_struct napi; 188 struct tbnet_stats stats; 189 struct sk_buff *skb; 190 atomic_t command_id; 191 bool login_sent; 192 bool login_received; 193 int local_transmit_path; 194 int remote_transmit_path; 195 struct mutex connection_lock; 196 int login_retries; 197 struct delayed_work login_work; 198 struct work_struct connected_work; 199 struct work_struct disconnect_work; 200 struct thunderbolt_ip_frame_header rx_hdr; 201 struct tbnet_ring rx_ring; 202 atomic_t frame_id; 203 struct tbnet_ring tx_ring; 204 }; 205 206 /* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */ 207 static const uuid_t tbnet_dir_uuid = 208 UUID_INIT(0xc66189ca, 0x1cce, 0x4195, 209 0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f); 210 211 /* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */ 212 static const uuid_t tbnet_svc_uuid = 213 UUID_INIT(0x798f589e, 0x3616, 0x8a47, 214 0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd); 215 216 static struct tb_property_dir *tbnet_dir; 217 218 static bool tbnet_e2e = true; 219 module_param_named(e2e, tbnet_e2e, bool, 0444); 220 MODULE_PARM_DESC(e2e, "USB4NET full end-to-end flow control (default: true)"); 221 222 static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route, 223 u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid, 224 enum thunderbolt_ip_type type, size_t size, u32 command_id) 225 { 226 u32 length_sn; 227 228 /* Length does not include route_hi/lo and length_sn fields */ 229 length_sn = (size - 3 * 4) / 4; 230 length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK; 231 232 hdr->route_hi = upper_32_bits(route); 233 hdr->route_lo = lower_32_bits(route); 234 hdr->length_sn = length_sn; 235 uuid_copy(&hdr->uuid, &tbnet_svc_uuid); 236 uuid_copy(&hdr->initiator_uuid, initiator_uuid); 237 uuid_copy(&hdr->target_uuid, target_uuid); 238 hdr->type = type; 239 hdr->command_id = command_id; 240 } 241 242 static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence, 243 u32 command_id) 244 { 245 struct thunderbolt_ip_login_response reply; 246 struct tb_xdomain *xd = net->xd; 247 248 memset(&reply, 0, sizeof(reply)); 249 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, 250 xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply), 251 command_id); 252 memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN); 253 reply.receiver_mac_len = ETH_ALEN; 254 255 return tb_xdomain_response(xd, &reply, sizeof(reply), 256 TB_CFG_PKG_XDOMAIN_RESP); 257 } 258 259 static int tbnet_login_request(struct tbnet *net, u8 sequence) 260 { 261 struct thunderbolt_ip_login_response reply; 262 struct thunderbolt_ip_login request; 263 struct tb_xdomain *xd = net->xd; 264 265 memset(&request, 0, sizeof(request)); 266 tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid, 267 xd->remote_uuid, TBIP_LOGIN, sizeof(request), 268 atomic_inc_return(&net->command_id)); 269 270 request.proto_version = TBIP_LOGIN_PROTO_VERSION; 271 request.transmit_path = net->local_transmit_path; 272 273 return tb_xdomain_request(xd, &request, sizeof(request), 274 TB_CFG_PKG_XDOMAIN_RESP, &reply, 275 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, 276 TBNET_LOGIN_TIMEOUT); 277 } 278 279 static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence, 280 u32 command_id) 281 { 282 struct thunderbolt_ip_status reply; 283 struct tb_xdomain *xd = net->xd; 284 285 memset(&reply, 0, sizeof(reply)); 286 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid, 287 xd->remote_uuid, TBIP_STATUS, sizeof(reply), 288 atomic_inc_return(&net->command_id)); 289 return tb_xdomain_response(xd, &reply, sizeof(reply), 290 TB_CFG_PKG_XDOMAIN_RESP); 291 } 292 293 static int tbnet_logout_request(struct tbnet *net) 294 { 295 struct thunderbolt_ip_logout request; 296 struct thunderbolt_ip_status reply; 297 struct tb_xdomain *xd = net->xd; 298 299 memset(&request, 0, sizeof(request)); 300 tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid, 301 xd->remote_uuid, TBIP_LOGOUT, sizeof(request), 302 atomic_inc_return(&net->command_id)); 303 304 return tb_xdomain_request(xd, &request, sizeof(request), 305 TB_CFG_PKG_XDOMAIN_RESP, &reply, 306 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP, 307 TBNET_LOGOUT_TIMEOUT); 308 } 309 310 static void start_login(struct tbnet *net) 311 { 312 netdev_dbg(net->dev, "login started\n"); 313 314 mutex_lock(&net->connection_lock); 315 net->login_sent = false; 316 net->login_received = false; 317 mutex_unlock(&net->connection_lock); 318 319 queue_delayed_work(system_long_wq, &net->login_work, 320 msecs_to_jiffies(1000)); 321 } 322 323 static void stop_login(struct tbnet *net) 324 { 325 cancel_delayed_work_sync(&net->login_work); 326 cancel_work_sync(&net->connected_work); 327 328 netdev_dbg(net->dev, "login stopped\n"); 329 } 330 331 static void tbnet_free_buffers(struct tbnet_ring *ring) 332 { 333 unsigned int i; 334 335 for (i = 0; i < TBNET_RING_SIZE; i++) { 336 struct device *dma_dev = tb_ring_dma_device(ring->ring); 337 struct tbnet_frame *tf = &ring->frames[i]; 338 enum dma_data_direction dir; 339 unsigned int order; 340 size_t size; 341 342 if (!tf->page) 343 continue; 344 345 if (ring->ring->is_tx) { 346 dir = DMA_TO_DEVICE; 347 order = 0; 348 size = TBNET_FRAME_SIZE; 349 } else { 350 dir = DMA_FROM_DEVICE; 351 order = TBNET_RX_PAGE_ORDER; 352 size = TBNET_RX_PAGE_SIZE; 353 } 354 355 trace_tbnet_free_frame(i, tf->page, tf->frame.buffer_phy, dir); 356 357 if (tf->frame.buffer_phy) 358 dma_unmap_page(dma_dev, tf->frame.buffer_phy, size, 359 dir); 360 361 __free_pages(tf->page, order); 362 tf->page = NULL; 363 } 364 365 ring->cons = 0; 366 ring->prod = 0; 367 } 368 369 static void tbnet_tear_down(struct tbnet *net, bool send_logout) 370 { 371 netif_carrier_off(net->dev); 372 netif_stop_queue(net->dev); 373 374 stop_login(net); 375 376 mutex_lock(&net->connection_lock); 377 378 if (net->login_sent && net->login_received) { 379 int ret, retries = TBNET_LOGOUT_RETRIES; 380 381 while (send_logout && retries-- > 0) { 382 netdev_dbg(net->dev, "sending logout request %u\n", 383 retries); 384 ret = tbnet_logout_request(net); 385 if (ret != -ETIMEDOUT) 386 break; 387 } 388 389 /* Tear the paths down before stopping the rings. This mirrors 390 * tbnet_connected_work(), which enables the paths last so the 391 * Rx ring is primed before packets can arrive. Stopping a 392 * ring zeroes its descriptor base and tbnet_free_buffers() 393 * unmaps and frees the frame buffers, leaving anything still 394 * in flight with nowhere to drain to; 395 * __tb_path_deactivate_hop() then waits for the hop's 396 * 'pending' bit, which on some host routers never clears in 397 * that state. 398 */ 399 ret = tb_xdomain_disable_paths(net->xd, 400 net->local_transmit_path, 401 net->tx_ring.ring->hop, 402 net->remote_transmit_path, 403 net->rx_ring.ring->hop); 404 if (ret) 405 netdev_warn(net->dev, "failed to disable DMA paths\n"); 406 407 tb_ring_stop(net->rx_ring.ring); 408 tb_ring_stop(net->tx_ring.ring); 409 tbnet_free_buffers(&net->rx_ring); 410 tbnet_free_buffers(&net->tx_ring); 411 412 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path); 413 net->remote_transmit_path = 0; 414 } 415 416 net->login_retries = 0; 417 net->login_sent = false; 418 net->login_received = false; 419 420 netdev_dbg(net->dev, "network traffic stopped\n"); 421 422 mutex_unlock(&net->connection_lock); 423 } 424 425 static int tbnet_handle_packet(const void *buf, size_t size, void *data) 426 { 427 const struct thunderbolt_ip_login *pkg = buf; 428 struct tbnet *net = data; 429 u32 command_id; 430 int ret = 0; 431 u32 sequence; 432 u64 route; 433 434 /* Make sure the packet is for us */ 435 if (size < sizeof(struct thunderbolt_ip_header)) 436 return 0; 437 if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid)) 438 return 0; 439 if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid)) 440 return 0; 441 442 route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo; 443 route &= ~BIT_ULL(63); 444 if (route != net->xd->route) 445 return 0; 446 447 sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK; 448 sequence >>= TBIP_HDR_SN_SHIFT; 449 command_id = pkg->hdr.command_id; 450 451 switch (pkg->hdr.type) { 452 case TBIP_LOGIN: 453 netdev_dbg(net->dev, "remote login request received\n"); 454 if (!netif_running(net->dev)) 455 break; 456 457 ret = tbnet_login_response(net, route, sequence, 458 pkg->hdr.command_id); 459 if (!ret) { 460 netdev_dbg(net->dev, "remote login response sent\n"); 461 462 mutex_lock(&net->connection_lock); 463 net->login_received = true; 464 net->remote_transmit_path = pkg->transmit_path; 465 466 /* If we reached the number of max retries or 467 * previous logout, schedule another round of 468 * login retries 469 */ 470 if (net->login_retries >= TBNET_LOGIN_RETRIES || 471 !net->login_sent) { 472 net->login_retries = 0; 473 queue_delayed_work(system_long_wq, 474 &net->login_work, 0); 475 } 476 mutex_unlock(&net->connection_lock); 477 478 queue_work(system_long_wq, &net->connected_work); 479 } 480 break; 481 482 case TBIP_LOGOUT: 483 netdev_dbg(net->dev, "remote logout request received\n"); 484 ret = tbnet_logout_response(net, route, sequence, command_id); 485 if (!ret) { 486 netdev_dbg(net->dev, "remote logout response sent\n"); 487 queue_work(system_long_wq, &net->disconnect_work); 488 } 489 break; 490 491 default: 492 return 0; 493 } 494 495 if (ret) 496 netdev_warn(net->dev, "failed to send ThunderboltIP response\n"); 497 498 return 1; 499 } 500 501 static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring) 502 { 503 return ring->prod - ring->cons; 504 } 505 506 static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers) 507 { 508 struct tbnet_ring *ring = &net->rx_ring; 509 int ret; 510 511 while (nbuffers--) { 512 struct device *dma_dev = tb_ring_dma_device(ring->ring); 513 unsigned int index = ring->prod & (TBNET_RING_SIZE - 1); 514 struct tbnet_frame *tf = &ring->frames[index]; 515 dma_addr_t dma_addr; 516 517 if (tf->page) 518 break; 519 520 /* Allocate page (order > 0) so that it can hold maximum 521 * ThunderboltIP frame (4kB) and the additional room for 522 * SKB shared info required by build_skb(). 523 */ 524 tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER); 525 if (!tf->page) { 526 ret = -ENOMEM; 527 goto err_free; 528 } 529 530 dma_addr = dma_map_page(dma_dev, tf->page, 0, 531 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE); 532 if (dma_mapping_error(dma_dev, dma_addr)) { 533 ret = -ENOMEM; 534 goto err_free; 535 } 536 537 tf->frame.buffer_phy = dma_addr; 538 tf->dev = net->dev; 539 540 trace_tbnet_alloc_rx_frame(index, tf->page, dma_addr, 541 DMA_FROM_DEVICE); 542 543 tb_ring_rx(ring->ring, &tf->frame); 544 545 ring->prod++; 546 } 547 548 return 0; 549 550 err_free: 551 tbnet_free_buffers(ring); 552 return ret; 553 } 554 555 static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net) 556 { 557 struct tbnet_ring *ring = &net->tx_ring; 558 struct device *dma_dev = tb_ring_dma_device(ring->ring); 559 struct tbnet_frame *tf; 560 unsigned int index; 561 562 if (!tbnet_available_buffers(ring)) 563 return NULL; 564 565 index = ring->cons++ & (TBNET_RING_SIZE - 1); 566 567 tf = &ring->frames[index]; 568 tf->frame.size = 0; 569 570 dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy, 571 tb_ring_frame_size(&tf->frame), DMA_TO_DEVICE); 572 573 return tf; 574 } 575 576 static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame, 577 bool canceled) 578 { 579 struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame); 580 struct tbnet *net = netdev_priv(tf->dev); 581 582 /* Return buffer to the ring */ 583 net->tx_ring.prod++; 584 585 if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2) 586 netif_wake_queue(net->dev); 587 } 588 589 static int tbnet_alloc_tx_buffers(struct tbnet *net) 590 { 591 struct tbnet_ring *ring = &net->tx_ring; 592 struct device *dma_dev = tb_ring_dma_device(ring->ring); 593 unsigned int i; 594 595 for (i = 0; i < TBNET_RING_SIZE; i++) { 596 struct tbnet_frame *tf = &ring->frames[i]; 597 dma_addr_t dma_addr; 598 599 tf->page = alloc_page(GFP_KERNEL); 600 if (!tf->page) { 601 tbnet_free_buffers(ring); 602 return -ENOMEM; 603 } 604 605 dma_addr = dma_map_page(dma_dev, tf->page, 0, TBNET_FRAME_SIZE, 606 DMA_TO_DEVICE); 607 if (dma_mapping_error(dma_dev, dma_addr)) { 608 __free_page(tf->page); 609 tf->page = NULL; 610 tbnet_free_buffers(ring); 611 return -ENOMEM; 612 } 613 614 tf->dev = net->dev; 615 tf->frame.buffer_phy = dma_addr; 616 tf->frame.callback = tbnet_tx_callback; 617 tf->frame.sof = TBIP_PDF_FRAME_START; 618 tf->frame.eof = TBIP_PDF_FRAME_END; 619 620 trace_tbnet_alloc_tx_frame(i, tf->page, dma_addr, DMA_TO_DEVICE); 621 } 622 623 ring->cons = 0; 624 ring->prod = TBNET_RING_SIZE - 1; 625 626 return 0; 627 } 628 629 static void tbnet_connected_work(struct work_struct *work) 630 { 631 struct tbnet *net = container_of(work, typeof(*net), connected_work); 632 bool connected; 633 int ret; 634 635 if (netif_carrier_ok(net->dev)) 636 return; 637 638 mutex_lock(&net->connection_lock); 639 connected = net->login_sent && net->login_received; 640 mutex_unlock(&net->connection_lock); 641 642 if (!connected) 643 return; 644 645 netdev_dbg(net->dev, "login successful, enabling paths\n"); 646 647 ret = tb_xdomain_alloc_in_hopid(net->xd, net->remote_transmit_path); 648 if (ret != net->remote_transmit_path) { 649 netdev_err(net->dev, "failed to allocate Rx HopID\n"); 650 return; 651 } 652 653 /* Both logins successful so enable the rings, high-speed DMA 654 * paths and start the network device queue. 655 * 656 * Note we enable the DMA paths last to make sure we have primed 657 * the Rx ring before any incoming packets are allowed to 658 * arrive. 659 */ 660 tb_ring_start(net->tx_ring.ring); 661 tb_ring_start(net->rx_ring.ring); 662 663 ret = tbnet_alloc_rx_buffers(net, TBNET_RING_SIZE); 664 if (ret) 665 goto err_stop_rings; 666 667 ret = tbnet_alloc_tx_buffers(net); 668 if (ret) 669 goto err_free_rx_buffers; 670 671 ret = tb_xdomain_enable_paths(net->xd, net->local_transmit_path, 672 net->tx_ring.ring->hop, 673 net->remote_transmit_path, 674 net->rx_ring.ring->hop); 675 if (ret) { 676 netdev_err(net->dev, "failed to enable DMA paths\n"); 677 goto err_free_tx_buffers; 678 } 679 680 netif_carrier_on(net->dev); 681 netif_start_queue(net->dev); 682 683 netdev_dbg(net->dev, "network traffic started\n"); 684 return; 685 686 err_free_tx_buffers: 687 tbnet_free_buffers(&net->tx_ring); 688 err_free_rx_buffers: 689 tbnet_free_buffers(&net->rx_ring); 690 err_stop_rings: 691 tb_ring_stop(net->rx_ring.ring); 692 tb_ring_stop(net->tx_ring.ring); 693 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path); 694 } 695 696 static void tbnet_login_work(struct work_struct *work) 697 { 698 struct tbnet *net = container_of(work, typeof(*net), login_work.work); 699 unsigned long delay = msecs_to_jiffies(TBNET_LOGIN_DELAY); 700 int ret; 701 702 if (netif_carrier_ok(net->dev)) 703 return; 704 705 netdev_dbg(net->dev, "sending login request, retries=%u\n", 706 net->login_retries); 707 708 ret = tbnet_login_request(net, net->login_retries % 4); 709 if (ret) { 710 netdev_dbg(net->dev, "sending login request failed, ret=%d\n", 711 ret); 712 if (net->login_retries++ < TBNET_LOGIN_RETRIES) { 713 queue_delayed_work(system_long_wq, &net->login_work, 714 delay); 715 } else { 716 netdev_info(net->dev, "ThunderboltIP login timed out\n"); 717 } 718 } else { 719 netdev_dbg(net->dev, "received login reply\n"); 720 721 net->login_retries = 0; 722 723 mutex_lock(&net->connection_lock); 724 net->login_sent = true; 725 mutex_unlock(&net->connection_lock); 726 727 queue_work(system_long_wq, &net->connected_work); 728 } 729 } 730 731 static void tbnet_disconnect_work(struct work_struct *work) 732 { 733 struct tbnet *net = container_of(work, typeof(*net), disconnect_work); 734 735 tbnet_tear_down(net, false); 736 } 737 738 static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf, 739 const struct thunderbolt_ip_frame_header *hdr) 740 { 741 u32 frame_id, frame_count, frame_size, frame_index; 742 unsigned int size; 743 744 if (tf->frame.flags & RING_DESC_CRC_ERROR) { 745 net->stats.rx_crc_errors++; 746 return false; 747 } else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) { 748 net->stats.rx_over_errors++; 749 return false; 750 } 751 752 /* Should be greater than just header i.e. contains data */ 753 size = tb_ring_frame_size(&tf->frame); 754 if (size <= sizeof(*hdr)) { 755 net->stats.rx_length_errors++; 756 return false; 757 } 758 759 frame_count = le32_to_cpu(hdr->frame_count); 760 frame_size = le32_to_cpu(hdr->frame_size); 761 frame_index = le16_to_cpu(hdr->frame_index); 762 frame_id = le16_to_cpu(hdr->frame_id); 763 764 if ((frame_size > size - sizeof(*hdr)) || !frame_size) { 765 net->stats.rx_length_errors++; 766 return false; 767 } 768 769 /* In case we're in the middle of packet, validate the frame 770 * header based on first fragment of the packet. 771 */ 772 if (net->skb && net->rx_hdr.frame_count) { 773 /* Check the frame count fits the count field */ 774 if (frame_count != le32_to_cpu(net->rx_hdr.frame_count)) { 775 net->stats.rx_length_errors++; 776 return false; 777 } 778 779 /* Check the frame identifiers are incremented correctly, 780 * and id is matching. 781 */ 782 if (frame_index != le16_to_cpu(net->rx_hdr.frame_index) + 1 || 783 frame_id != le16_to_cpu(net->rx_hdr.frame_id)) { 784 net->stats.rx_missed_errors++; 785 return false; 786 } 787 788 if (net->skb->len + frame_size > TBNET_MAX_MTU) { 789 net->stats.rx_length_errors++; 790 return false; 791 } 792 793 return true; 794 } 795 796 /* Start of packet, validate the frame header. tbnet_poll() puts the 797 * first frame in the skb linear area and every further frame in a page 798 * fragment, so a packet may not span more than MAX_SKB_FRAGS + 1 frames 799 * without overflowing skb_shinfo()->frags[]. 800 */ 801 if (frame_count == 0 || frame_count > MAX_SKB_FRAGS + 1) { 802 net->stats.rx_length_errors++; 803 return false; 804 } 805 if (frame_index != 0) { 806 net->stats.rx_missed_errors++; 807 return false; 808 } 809 810 return true; 811 } 812 813 static int tbnet_poll(struct napi_struct *napi, int budget) 814 { 815 struct tbnet *net = container_of(napi, struct tbnet, napi); 816 unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring); 817 struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring); 818 unsigned int rx_packets = 0; 819 820 while (rx_packets < budget) { 821 const struct thunderbolt_ip_frame_header *hdr; 822 unsigned int hdr_size = sizeof(*hdr); 823 struct sk_buff *skb = NULL; 824 struct ring_frame *frame; 825 struct tbnet_frame *tf; 826 struct page *page; 827 bool last = true; 828 u32 frame_size; 829 830 /* Return some buffers to hardware, one at a time is too 831 * slow so allocate MAX_SKB_FRAGS buffers at the same 832 * time. 833 */ 834 if (cleaned_count >= MAX_SKB_FRAGS) { 835 tbnet_alloc_rx_buffers(net, cleaned_count); 836 cleaned_count = 0; 837 } 838 839 frame = tb_ring_poll(net->rx_ring.ring); 840 if (!frame) 841 break; 842 843 dma_unmap_page(dma_dev, frame->buffer_phy, 844 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE); 845 846 tf = container_of(frame, typeof(*tf), frame); 847 848 page = tf->page; 849 tf->page = NULL; 850 net->rx_ring.cons++; 851 cleaned_count++; 852 853 hdr = page_address(page); 854 if (!tbnet_check_frame(net, tf, hdr)) { 855 trace_tbnet_invalid_rx_ip_frame(hdr->frame_size, 856 hdr->frame_id, hdr->frame_index, hdr->frame_count); 857 __free_pages(page, TBNET_RX_PAGE_ORDER); 858 dev_kfree_skb_any(net->skb); 859 net->skb = NULL; 860 continue; 861 } 862 863 trace_tbnet_rx_ip_frame(hdr->frame_size, hdr->frame_id, 864 hdr->frame_index, hdr->frame_count); 865 frame_size = le32_to_cpu(hdr->frame_size); 866 867 skb = net->skb; 868 if (!skb) { 869 skb = build_skb(page_address(page), 870 TBNET_RX_PAGE_SIZE); 871 if (!skb) { 872 __free_pages(page, TBNET_RX_PAGE_ORDER); 873 net->stats.rx_errors++; 874 break; 875 } 876 877 skb_reserve(skb, hdr_size); 878 skb_put(skb, frame_size); 879 880 net->skb = skb; 881 } else { 882 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 883 page, hdr_size, frame_size, 884 TBNET_RX_PAGE_SIZE - hdr_size); 885 } 886 887 net->rx_hdr.frame_size = hdr->frame_size; 888 net->rx_hdr.frame_count = hdr->frame_count; 889 net->rx_hdr.frame_index = hdr->frame_index; 890 net->rx_hdr.frame_id = hdr->frame_id; 891 last = le16_to_cpu(net->rx_hdr.frame_index) == 892 le32_to_cpu(net->rx_hdr.frame_count) - 1; 893 894 rx_packets++; 895 net->stats.rx_bytes += frame_size; 896 897 if (last) { 898 skb->protocol = eth_type_trans(skb, net->dev); 899 trace_tbnet_rx_skb(skb); 900 napi_gro_receive(&net->napi, skb); 901 net->skb = NULL; 902 } 903 } 904 905 net->stats.rx_packets += rx_packets; 906 907 if (cleaned_count) 908 tbnet_alloc_rx_buffers(net, cleaned_count); 909 910 if (rx_packets >= budget) 911 return budget; 912 913 napi_complete_done(napi, rx_packets); 914 /* Re-enable the ring interrupt */ 915 tb_ring_poll_complete(net->rx_ring.ring); 916 917 return rx_packets; 918 } 919 920 static void tbnet_start_poll(void *data) 921 { 922 struct tbnet *net = data; 923 924 napi_schedule(&net->napi); 925 } 926 927 static int tbnet_open(struct net_device *dev) 928 { 929 struct tbnet *net = netdev_priv(dev); 930 struct tb_xdomain *xd = net->xd; 931 u16 sof_mask, eof_mask; 932 struct tb_ring *ring; 933 unsigned int flags; 934 int hopid; 935 936 netif_carrier_off(dev); 937 938 ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE, 939 RING_FLAG_FRAME); 940 if (!ring) { 941 netdev_err(dev, "failed to allocate Tx ring\n"); 942 return -ENOMEM; 943 } 944 net->tx_ring.ring = ring; 945 946 hopid = tb_xdomain_alloc_out_hopid(xd, -1); 947 if (hopid < 0) { 948 netdev_err(dev, "failed to allocate Tx HopID\n"); 949 tb_ring_free(net->tx_ring.ring); 950 net->tx_ring.ring = NULL; 951 return hopid; 952 } 953 net->local_transmit_path = hopid; 954 955 sof_mask = BIT(TBIP_PDF_FRAME_START); 956 eof_mask = BIT(TBIP_PDF_FRAME_END); 957 958 flags = RING_FLAG_FRAME; 959 /* Only enable full E2E if the other end supports it too */ 960 if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E) 961 flags |= RING_FLAG_E2E; 962 963 ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags, 964 net->tx_ring.ring->hop, sof_mask, 965 eof_mask, tbnet_start_poll, net); 966 if (!ring) { 967 netdev_err(dev, "failed to allocate Rx ring\n"); 968 tb_xdomain_release_out_hopid(xd, hopid); 969 tb_ring_free(net->tx_ring.ring); 970 net->tx_ring.ring = NULL; 971 return -ENOMEM; 972 } 973 net->rx_ring.ring = ring; 974 975 tb_ring_throttling(net->tx_ring.ring, TBNET_THROTTLING); 976 tb_ring_throttling(net->rx_ring.ring, TBNET_THROTTLING); 977 978 napi_enable(&net->napi); 979 start_login(net); 980 981 return 0; 982 } 983 984 static int tbnet_stop(struct net_device *dev) 985 { 986 struct tbnet *net = netdev_priv(dev); 987 988 napi_disable(&net->napi); 989 990 cancel_work_sync(&net->disconnect_work); 991 tbnet_tear_down(net, true); 992 993 tb_ring_free(net->rx_ring.ring); 994 net->rx_ring.ring = NULL; 995 996 tb_xdomain_release_out_hopid(net->xd, net->local_transmit_path); 997 tb_ring_free(net->tx_ring.ring); 998 net->tx_ring.ring = NULL; 999 1000 return 0; 1001 } 1002 1003 static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb, 1004 struct tbnet_frame **frames, u32 frame_count) 1005 { 1006 struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page); 1007 struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring); 1008 unsigned int i, len, offset = skb_transport_offset(skb); 1009 /* Remove payload length from checksum */ 1010 u32 paylen = skb->len - skb_transport_offset(skb); 1011 __wsum wsum = (__force __wsum)htonl(paylen); 1012 __be16 protocol = skb->protocol; 1013 void *data = skb->data; 1014 void *dest = hdr + 1; 1015 __sum16 *tucso; 1016 1017 if (skb->ip_summed != CHECKSUM_PARTIAL) { 1018 /* No need to calculate checksum so we just update the 1019 * total frame count and sync the frames for DMA. 1020 */ 1021 for (i = 0; i < frame_count; i++) { 1022 hdr = page_address(frames[i]->page); 1023 hdr->frame_count = cpu_to_le32(frame_count); 1024 trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id, 1025 hdr->frame_index, hdr->frame_count); 1026 dma_sync_single_for_device(dma_dev, 1027 frames[i]->frame.buffer_phy, 1028 tb_ring_frame_size(&frames[i]->frame), 1029 DMA_TO_DEVICE); 1030 } 1031 1032 return true; 1033 } 1034 1035 if (protocol == htons(ETH_P_8021Q)) { 1036 struct vlan_hdr *vhdr, vh; 1037 1038 vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh); 1039 if (!vhdr) 1040 return false; 1041 1042 protocol = vhdr->h_vlan_encapsulated_proto; 1043 } 1044 1045 /* Data points on the beginning of packet. 1046 * Check is the checksum absolute place in the packet. 1047 * ipcso will update IP checksum. 1048 * tucso will update TCP/UDP checksum. 1049 */ 1050 if (protocol == htons(ETH_P_IP)) { 1051 __sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data); 1052 1053 *ipcso = 0; 1054 *ipcso = ip_fast_csum(dest + skb_network_offset(skb), 1055 ip_hdr(skb)->ihl); 1056 1057 if (ip_hdr(skb)->protocol == IPPROTO_TCP) 1058 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data); 1059 else if (ip_hdr(skb)->protocol == IPPROTO_UDP) 1060 tucso = dest + ((void *)&(udp_hdr(skb)->check) - data); 1061 else 1062 return false; 1063 1064 *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 1065 ip_hdr(skb)->daddr, 0, 1066 ip_hdr(skb)->protocol, 0); 1067 } else if (skb_is_gso(skb) && skb_is_gso_v6(skb)) { 1068 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data); 1069 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 1070 &ipv6_hdr(skb)->daddr, 0, 1071 IPPROTO_TCP, 0); 1072 } else if (protocol == htons(ETH_P_IPV6)) { 1073 tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset; 1074 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 1075 &ipv6_hdr(skb)->daddr, 0, 1076 ipv6_hdr(skb)->nexthdr, 0); 1077 } else { 1078 return false; 1079 } 1080 1081 /* First frame was headers, rest of the frames contain data. 1082 * Calculate checksum over each frame. 1083 */ 1084 for (i = 0; i < frame_count; i++) { 1085 hdr = page_address(frames[i]->page); 1086 dest = (void *)(hdr + 1) + offset; 1087 len = le32_to_cpu(hdr->frame_size) - offset; 1088 wsum = csum_partial(dest, len, wsum); 1089 hdr->frame_count = cpu_to_le32(frame_count); 1090 trace_tbnet_tx_ip_frame(hdr->frame_size, hdr->frame_id, 1091 hdr->frame_index, hdr->frame_count); 1092 1093 offset = 0; 1094 } 1095 1096 *tucso = csum_fold(wsum); 1097 1098 /* Checksum is finally calculated and we don't touch the memory 1099 * anymore, so DMA sync the frames now. 1100 */ 1101 for (i = 0; i < frame_count; i++) { 1102 dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy, 1103 tb_ring_frame_size(&frames[i]->frame), DMA_TO_DEVICE); 1104 } 1105 1106 return true; 1107 } 1108 1109 static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num, 1110 unsigned int *len) 1111 { 1112 const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num]; 1113 1114 *len = skb_frag_size(frag); 1115 return kmap_local_page(skb_frag_page(frag)) + skb_frag_off(frag); 1116 } 1117 1118 static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb, 1119 struct net_device *dev) 1120 { 1121 struct tbnet *net = netdev_priv(dev); 1122 struct tbnet_frame *frames[MAX_SKB_FRAGS]; 1123 u16 frame_id = atomic_read(&net->frame_id); 1124 struct thunderbolt_ip_frame_header *hdr; 1125 unsigned int len = skb_headlen(skb); 1126 unsigned int data_len = skb->len; 1127 unsigned int nframes, i; 1128 unsigned int frag = 0; 1129 void *src = skb->data; 1130 u32 frame_index = 0; 1131 bool unmap = false; 1132 void *dest; 1133 1134 trace_tbnet_tx_skb(skb); 1135 1136 nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE); 1137 if (tbnet_available_buffers(&net->tx_ring) < nframes) { 1138 netif_stop_queue(net->dev); 1139 return NETDEV_TX_BUSY; 1140 } 1141 1142 frames[frame_index] = tbnet_get_tx_buffer(net); 1143 if (!frames[frame_index]) 1144 goto err_drop; 1145 1146 hdr = page_address(frames[frame_index]->page); 1147 dest = hdr + 1; 1148 1149 /* If overall packet is bigger than the frame data size */ 1150 while (data_len > TBNET_MAX_PAYLOAD_SIZE) { 1151 unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE; 1152 1153 hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE); 1154 hdr->frame_index = cpu_to_le16(frame_index); 1155 hdr->frame_id = cpu_to_le16(frame_id); 1156 1157 do { 1158 if (len > size_left) { 1159 /* Copy data onto Tx buffer data with 1160 * full frame size then break and go to 1161 * next frame 1162 */ 1163 memcpy(dest, src, size_left); 1164 len -= size_left; 1165 dest += size_left; 1166 src += size_left; 1167 break; 1168 } 1169 1170 memcpy(dest, src, len); 1171 size_left -= len; 1172 dest += len; 1173 1174 if (unmap) { 1175 kunmap_local(src); 1176 unmap = false; 1177 } 1178 1179 /* Ensure all fragments have been processed */ 1180 if (frag < skb_shinfo(skb)->nr_frags) { 1181 /* Map and then unmap quickly */ 1182 src = tbnet_kmap_frag(skb, frag++, &len); 1183 unmap = true; 1184 } else if (unlikely(size_left > 0)) { 1185 goto err_drop; 1186 } 1187 } while (size_left > 0); 1188 1189 data_len -= TBNET_MAX_PAYLOAD_SIZE; 1190 frame_index++; 1191 1192 frames[frame_index] = tbnet_get_tx_buffer(net); 1193 if (!frames[frame_index]) 1194 goto err_drop; 1195 1196 hdr = page_address(frames[frame_index]->page); 1197 dest = hdr + 1; 1198 } 1199 1200 hdr->frame_size = cpu_to_le32(data_len); 1201 hdr->frame_index = cpu_to_le16(frame_index); 1202 hdr->frame_id = cpu_to_le16(frame_id); 1203 1204 frames[frame_index]->frame.size = data_len + sizeof(*hdr); 1205 1206 /* In case the remaining data_len is smaller than a frame */ 1207 while (len < data_len) { 1208 memcpy(dest, src, len); 1209 data_len -= len; 1210 dest += len; 1211 1212 if (unmap) { 1213 kunmap_local(src); 1214 unmap = false; 1215 } 1216 1217 if (frag < skb_shinfo(skb)->nr_frags) { 1218 src = tbnet_kmap_frag(skb, frag++, &len); 1219 unmap = true; 1220 } else if (unlikely(data_len > 0)) { 1221 goto err_drop; 1222 } 1223 } 1224 1225 memcpy(dest, src, data_len); 1226 1227 if (unmap) 1228 kunmap_local(src); 1229 1230 if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1)) 1231 goto err_drop; 1232 1233 for (i = 0; i < frame_index + 1; i++) 1234 tb_ring_tx(net->tx_ring.ring, &frames[i]->frame); 1235 1236 if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID) 1237 atomic_inc(&net->frame_id); 1238 1239 net->stats.tx_packets++; 1240 net->stats.tx_bytes += skb->len; 1241 1242 trace_tbnet_consume_skb(skb); 1243 dev_consume_skb_any(skb); 1244 1245 return NETDEV_TX_OK; 1246 1247 err_drop: 1248 /* We can re-use the buffers */ 1249 net->tx_ring.cons -= frame_index; 1250 1251 dev_kfree_skb_any(skb); 1252 net->stats.tx_errors++; 1253 1254 return NETDEV_TX_OK; 1255 } 1256 1257 static void tbnet_get_stats64(struct net_device *dev, 1258 struct rtnl_link_stats64 *stats) 1259 { 1260 struct tbnet *net = netdev_priv(dev); 1261 1262 stats->tx_packets = net->stats.tx_packets; 1263 stats->rx_packets = net->stats.rx_packets; 1264 stats->tx_bytes = net->stats.tx_bytes; 1265 stats->rx_bytes = net->stats.rx_bytes; 1266 stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors + 1267 net->stats.rx_over_errors + net->stats.rx_crc_errors + 1268 net->stats.rx_missed_errors; 1269 stats->tx_errors = net->stats.tx_errors; 1270 stats->rx_length_errors = net->stats.rx_length_errors; 1271 stats->rx_over_errors = net->stats.rx_over_errors; 1272 stats->rx_crc_errors = net->stats.rx_crc_errors; 1273 stats->rx_missed_errors = net->stats.rx_missed_errors; 1274 } 1275 1276 static const struct net_device_ops tbnet_netdev_ops = { 1277 .ndo_open = tbnet_open, 1278 .ndo_stop = tbnet_stop, 1279 .ndo_start_xmit = tbnet_start_xmit, 1280 .ndo_set_mac_address = eth_mac_addr, 1281 .ndo_get_stats64 = tbnet_get_stats64, 1282 }; 1283 1284 static int tbnet_get_link_ksettings(struct net_device *dev, 1285 struct ethtool_link_ksettings *cmd) 1286 { 1287 const struct tbnet *net = netdev_priv(dev); 1288 const struct tb_xdomain *xd = net->xd; 1289 int speed; 1290 1291 ethtool_link_ksettings_zero_link_mode(cmd, supported); 1292 ethtool_link_ksettings_zero_link_mode(cmd, advertising); 1293 1294 /* Figure out the current link speed and width */ 1295 switch (xd->link_speed) { 1296 case 40: 1297 speed = SPEED_80000; 1298 break; 1299 1300 case 20: 1301 if (xd->link_width == 2) 1302 speed = SPEED_40000; 1303 else 1304 speed = SPEED_20000; 1305 break; 1306 1307 case 10: 1308 if (xd->link_width == 2) { 1309 speed = SPEED_20000; 1310 break; 1311 } 1312 fallthrough; 1313 1314 default: 1315 speed = SPEED_10000; 1316 break; 1317 } 1318 1319 cmd->base.speed = speed; 1320 cmd->base.duplex = DUPLEX_FULL; 1321 cmd->base.autoneg = AUTONEG_DISABLE; 1322 cmd->base.port = PORT_OTHER; 1323 1324 return 0; 1325 } 1326 1327 static const struct ethtool_ops tbnet_ethtool_ops = { 1328 .get_link_ksettings = tbnet_get_link_ksettings, 1329 }; 1330 1331 static void tbnet_generate_mac(struct net_device *dev) 1332 { 1333 const struct tbnet *net = netdev_priv(dev); 1334 const struct tb_xdomain *xd = net->xd; 1335 u8 addr[ETH_ALEN]; 1336 u8 phy_port; 1337 u32 hash; 1338 1339 phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route)); 1340 1341 /* Unicast and locally administered MAC */ 1342 addr[0] = phy_port << 4 | 0x02; 1343 hash = jhash2((u32 *)xd->local_uuid, 4, 0); 1344 memcpy(addr + 1, &hash, sizeof(hash)); 1345 hash = jhash2((u32 *)xd->local_uuid, 4, hash); 1346 addr[5] = hash & 0xff; 1347 eth_hw_addr_set(dev, addr); 1348 1349 /* Allow changing it if needed */ 1350 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 1351 } 1352 1353 static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id) 1354 { 1355 struct tb_xdomain *xd = tb_service_parent(svc); 1356 struct net_device *dev; 1357 struct tbnet *net; 1358 int ret; 1359 1360 dev = alloc_etherdev(sizeof(*net)); 1361 if (!dev) 1362 return -ENOMEM; 1363 1364 SET_NETDEV_DEV(dev, &svc->dev); 1365 1366 net = netdev_priv(dev); 1367 INIT_DELAYED_WORK(&net->login_work, tbnet_login_work); 1368 INIT_WORK(&net->connected_work, tbnet_connected_work); 1369 INIT_WORK(&net->disconnect_work, tbnet_disconnect_work); 1370 mutex_init(&net->connection_lock); 1371 atomic_set(&net->command_id, 0); 1372 atomic_set(&net->frame_id, 0); 1373 net->svc = svc; 1374 net->dev = dev; 1375 net->xd = xd; 1376 1377 tbnet_generate_mac(dev); 1378 1379 strcpy(dev->name, "thunderbolt%d"); 1380 dev->netdev_ops = &tbnet_netdev_ops; 1381 dev->ethtool_ops = &tbnet_ethtool_ops; 1382 1383 /* ThunderboltIP takes advantage of TSO packets but instead of 1384 * segmenting them we just split the packet into Thunderbolt 1385 * frames (maximum payload size of each frame is 4084 bytes) and 1386 * calculate checksum over the whole packet here. 1387 * 1388 * The receiving side does the opposite if the host OS supports 1389 * LRO, otherwise it needs to split the large packet into MTU 1390 * sized smaller packets. 1391 * 1392 * In order to receive large packets from the networking stack, 1393 * we need to announce support for most of the offloading 1394 * features here. 1395 */ 1396 dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO | 1397 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; 1398 dev->features = dev->hw_features | NETIF_F_HIGHDMA; 1399 dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header); 1400 1401 netif_napi_add(dev, &net->napi, tbnet_poll); 1402 1403 /* MTU range: 68 - 65522 */ 1404 dev->min_mtu = ETH_MIN_MTU; 1405 dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN; 1406 1407 net->handler.uuid = &tbnet_svc_uuid; 1408 net->handler.callback = tbnet_handle_packet; 1409 net->handler.data = net; 1410 tb_register_protocol_handler(&net->handler); 1411 1412 tb_service_set_drvdata(svc, net); 1413 1414 ret = register_netdev(dev); 1415 if (ret) { 1416 tb_unregister_protocol_handler(&net->handler); 1417 free_netdev(dev); 1418 return ret; 1419 } 1420 1421 return 0; 1422 } 1423 1424 static void tbnet_remove(struct tb_service *svc) 1425 { 1426 struct tbnet *net = tb_service_get_drvdata(svc); 1427 1428 unregister_netdev(net->dev); 1429 tb_unregister_protocol_handler(&net->handler); 1430 free_netdev(net->dev); 1431 } 1432 1433 static void tbnet_shutdown(struct tb_service *svc) 1434 { 1435 tbnet_tear_down(tb_service_get_drvdata(svc), true); 1436 } 1437 1438 static int tbnet_suspend(struct device *dev) 1439 { 1440 struct tb_service *svc = tb_to_service(dev); 1441 struct tbnet *net = tb_service_get_drvdata(svc); 1442 1443 stop_login(net); 1444 if (netif_running(net->dev)) { 1445 netif_device_detach(net->dev); 1446 tbnet_tear_down(net, true); 1447 } 1448 1449 tb_unregister_protocol_handler(&net->handler); 1450 return 0; 1451 } 1452 1453 static int tbnet_resume(struct device *dev) 1454 { 1455 struct tb_service *svc = tb_to_service(dev); 1456 struct tbnet *net = tb_service_get_drvdata(svc); 1457 1458 tb_register_protocol_handler(&net->handler); 1459 1460 netif_carrier_off(net->dev); 1461 if (netif_running(net->dev)) { 1462 netif_device_attach(net->dev); 1463 start_login(net); 1464 } 1465 1466 return 0; 1467 } 1468 1469 static DEFINE_SIMPLE_DEV_PM_OPS(tbnet_pm_ops, tbnet_suspend, tbnet_resume); 1470 1471 static const struct tb_service_id tbnet_ids[] = { 1472 { TB_SERVICE("network", 1) }, 1473 { }, 1474 }; 1475 MODULE_DEVICE_TABLE(tbsvc, tbnet_ids); 1476 1477 static struct tb_service_driver tbnet_driver = { 1478 .driver = { 1479 .owner = THIS_MODULE, 1480 .name = "thunderbolt-net", 1481 .pm = pm_sleep_ptr(&tbnet_pm_ops), 1482 }, 1483 .probe = tbnet_probe, 1484 .remove = tbnet_remove, 1485 .shutdown = tbnet_shutdown, 1486 .id_table = tbnet_ids, 1487 }; 1488 1489 static int __init tbnet_init(void) 1490 { 1491 unsigned int flags; 1492 int ret; 1493 1494 tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid); 1495 if (!tbnet_dir) 1496 return -ENOMEM; 1497 1498 tb_property_add_immediate(tbnet_dir, "prtcid", 1); 1499 tb_property_add_immediate(tbnet_dir, "prtcvers", 1); 1500 tb_property_add_immediate(tbnet_dir, "prtcrevs", 1); 1501 1502 flags = TBNET_MATCH_FRAGS_ID | TBNET_64K_FRAMES; 1503 if (tbnet_e2e) 1504 flags |= TBNET_E2E; 1505 tb_property_add_immediate(tbnet_dir, "prtcstns", flags); 1506 1507 ret = tb_register_property_dir("network", tbnet_dir); 1508 if (ret) 1509 goto err_free_dir; 1510 1511 ret = tb_register_service_driver(&tbnet_driver); 1512 if (ret) 1513 goto err_unregister; 1514 1515 return 0; 1516 1517 err_unregister: 1518 tb_unregister_property_dir("network", tbnet_dir); 1519 err_free_dir: 1520 tb_property_free_dir(tbnet_dir); 1521 1522 return ret; 1523 } 1524 module_init(tbnet_init); 1525 1526 static void __exit tbnet_exit(void) 1527 { 1528 tb_unregister_service_driver(&tbnet_driver); 1529 tb_unregister_property_dir("network", tbnet_dir); 1530 tb_property_free_dir(tbnet_dir); 1531 } 1532 module_exit(tbnet_exit); 1533 1534 MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>"); 1535 MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>"); 1536 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); 1537 MODULE_DESCRIPTION("Thunderbolt/USB4 network driver"); 1538 MODULE_LICENSE("GPL v2"); 1539