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/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 /* Protocol timeouts in ms */
27 #define TBNET_LOGIN_DELAY 4500
28 #define TBNET_LOGIN_TIMEOUT 500
29 #define TBNET_LOGOUT_TIMEOUT 1000
30
31 #define TBNET_RING_SIZE 256
32 #define TBNET_LOGIN_RETRIES 60
33 #define TBNET_LOGOUT_RETRIES 10
34 #define TBNET_E2E BIT(0)
35 #define TBNET_MATCH_FRAGS_ID BIT(1)
36 #define TBNET_64K_FRAMES BIT(2)
37 #define TBNET_MAX_MTU SZ_64K
38 #define TBNET_FRAME_SIZE SZ_4K
39 #define TBNET_MAX_PAYLOAD_SIZE \
40 (TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header))
41 /* Rx packets need to hold space for skb_shared_info */
42 #define TBNET_RX_MAX_SIZE \
43 (TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
44 #define TBNET_RX_PAGE_ORDER get_order(TBNET_RX_MAX_SIZE)
45 #define TBNET_RX_PAGE_SIZE (PAGE_SIZE << TBNET_RX_PAGE_ORDER)
46
47 #define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0))
48
49 /**
50 * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame
51 * @frame_size: size of the data with the frame
52 * @frame_index: running index on the frames
53 * @frame_id: ID of the frame to match frames to specific packet
54 * @frame_count: how many frames assembles a full packet
55 *
56 * Each data frame passed to the high-speed DMA ring has this header. If
57 * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is
58 * supported then @frame_id is filled, otherwise it stays %0.
59 */
60 struct thunderbolt_ip_frame_header {
61 u32 frame_size;
62 u16 frame_index;
63 u16 frame_id;
64 u32 frame_count;
65 };
66
67 enum thunderbolt_ip_frame_pdf {
68 TBIP_PDF_FRAME_START = 1,
69 TBIP_PDF_FRAME_END,
70 };
71
72 enum thunderbolt_ip_type {
73 TBIP_LOGIN,
74 TBIP_LOGIN_RESPONSE,
75 TBIP_LOGOUT,
76 TBIP_STATUS,
77 };
78
79 struct thunderbolt_ip_header {
80 u32 route_hi;
81 u32 route_lo;
82 u32 length_sn;
83 uuid_t uuid;
84 uuid_t initiator_uuid;
85 uuid_t target_uuid;
86 u32 type;
87 u32 command_id;
88 };
89
90 #define TBIP_HDR_LENGTH_MASK GENMASK(5, 0)
91 #define TBIP_HDR_SN_MASK GENMASK(28, 27)
92 #define TBIP_HDR_SN_SHIFT 27
93
94 struct thunderbolt_ip_login {
95 struct thunderbolt_ip_header hdr;
96 u32 proto_version;
97 u32 transmit_path;
98 u32 reserved[4];
99 };
100
101 #define TBIP_LOGIN_PROTO_VERSION 1
102
103 struct thunderbolt_ip_login_response {
104 struct thunderbolt_ip_header hdr;
105 u32 status;
106 u32 receiver_mac[2];
107 u32 receiver_mac_len;
108 u32 reserved[4];
109 };
110
111 struct thunderbolt_ip_logout {
112 struct thunderbolt_ip_header hdr;
113 };
114
115 struct thunderbolt_ip_status {
116 struct thunderbolt_ip_header hdr;
117 u32 status;
118 };
119
120 struct tbnet_stats {
121 u64 tx_packets;
122 u64 rx_packets;
123 u64 tx_bytes;
124 u64 rx_bytes;
125 u64 rx_errors;
126 u64 tx_errors;
127 u64 rx_length_errors;
128 u64 rx_over_errors;
129 u64 rx_crc_errors;
130 u64 rx_missed_errors;
131 };
132
133 struct tbnet_frame {
134 struct net_device *dev;
135 struct page *page;
136 struct ring_frame frame;
137 };
138
139 struct tbnet_ring {
140 struct tbnet_frame frames[TBNET_RING_SIZE];
141 unsigned int cons;
142 unsigned int prod;
143 struct tb_ring *ring;
144 };
145
146 /**
147 * struct tbnet - ThunderboltIP network driver private data
148 * @svc: XDomain service the driver is bound to
149 * @xd: XDomain the service blongs to
150 * @handler: ThunderboltIP configuration protocol handler
151 * @dev: Networking device
152 * @napi: NAPI structure for Rx polling
153 * @stats: Network statistics
154 * @skb: Network packet that is currently processed on Rx path
155 * @command_id: ID used for next configuration protocol packet
156 * @login_sent: ThunderboltIP login message successfully sent
157 * @login_received: ThunderboltIP login message received from the remote
158 * host
159 * @local_transmit_path: HopID we are using to send out packets
160 * @remote_transmit_path: HopID the other end is using to send packets to us
161 * @connection_lock: Lock serializing access to @login_sent,
162 * @login_received and @transmit_path.
163 * @login_retries: Number of login retries currently done
164 * @login_work: Worker to send ThunderboltIP login packets
165 * @connected_work: Worker that finalizes the ThunderboltIP connection
166 * setup and enables DMA paths for high speed data
167 * transfers
168 * @disconnect_work: Worker that handles tearing down the ThunderboltIP
169 * connection
170 * @rx_hdr: Copy of the currently processed Rx frame. Used when a
171 * network packet consists of multiple Thunderbolt frames.
172 * In host byte order.
173 * @rx_ring: Software ring holding Rx frames
174 * @frame_id: Frame ID use for next Tx packet
175 * (if %TBNET_MATCH_FRAGS_ID is supported in both ends)
176 * @tx_ring: Software ring holding Tx frames
177 */
178 struct tbnet {
179 const struct tb_service *svc;
180 struct tb_xdomain *xd;
181 struct tb_protocol_handler handler;
182 struct net_device *dev;
183 struct napi_struct napi;
184 struct tbnet_stats stats;
185 struct sk_buff *skb;
186 atomic_t command_id;
187 bool login_sent;
188 bool login_received;
189 int local_transmit_path;
190 int remote_transmit_path;
191 struct mutex connection_lock;
192 int login_retries;
193 struct delayed_work login_work;
194 struct work_struct connected_work;
195 struct work_struct disconnect_work;
196 struct thunderbolt_ip_frame_header rx_hdr;
197 struct tbnet_ring rx_ring;
198 atomic_t frame_id;
199 struct tbnet_ring tx_ring;
200 };
201
202 /* Network property directory UUID: c66189ca-1cce-4195-bdb8-49592e5f5a4f */
203 static const uuid_t tbnet_dir_uuid =
204 UUID_INIT(0xc66189ca, 0x1cce, 0x4195,
205 0xbd, 0xb8, 0x49, 0x59, 0x2e, 0x5f, 0x5a, 0x4f);
206
207 /* ThunderboltIP protocol UUID: 798f589e-3616-8a47-97c6-5664a920c8dd */
208 static const uuid_t tbnet_svc_uuid =
209 UUID_INIT(0x798f589e, 0x3616, 0x8a47,
210 0x97, 0xc6, 0x56, 0x64, 0xa9, 0x20, 0xc8, 0xdd);
211
212 static struct tb_property_dir *tbnet_dir;
213
214 static bool tbnet_e2e = true;
215 module_param_named(e2e, tbnet_e2e, bool, 0444);
216 MODULE_PARM_DESC(e2e, "USB4NET full end-to-end flow control (default: true)");
217
tbnet_fill_header(struct thunderbolt_ip_header * hdr,u64 route,u8 sequence,const uuid_t * initiator_uuid,const uuid_t * target_uuid,enum thunderbolt_ip_type type,size_t size,u32 command_id)218 static void tbnet_fill_header(struct thunderbolt_ip_header *hdr, u64 route,
219 u8 sequence, const uuid_t *initiator_uuid, const uuid_t *target_uuid,
220 enum thunderbolt_ip_type type, size_t size, u32 command_id)
221 {
222 u32 length_sn;
223
224 /* Length does not include route_hi/lo and length_sn fields */
225 length_sn = (size - 3 * 4) / 4;
226 length_sn |= (sequence << TBIP_HDR_SN_SHIFT) & TBIP_HDR_SN_MASK;
227
228 hdr->route_hi = upper_32_bits(route);
229 hdr->route_lo = lower_32_bits(route);
230 hdr->length_sn = length_sn;
231 uuid_copy(&hdr->uuid, &tbnet_svc_uuid);
232 uuid_copy(&hdr->initiator_uuid, initiator_uuid);
233 uuid_copy(&hdr->target_uuid, target_uuid);
234 hdr->type = type;
235 hdr->command_id = command_id;
236 }
237
tbnet_login_response(struct tbnet * net,u64 route,u8 sequence,u32 command_id)238 static int tbnet_login_response(struct tbnet *net, u64 route, u8 sequence,
239 u32 command_id)
240 {
241 struct thunderbolt_ip_login_response reply;
242 struct tb_xdomain *xd = net->xd;
243
244 memset(&reply, 0, sizeof(reply));
245 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,
246 xd->remote_uuid, TBIP_LOGIN_RESPONSE, sizeof(reply),
247 command_id);
248 memcpy(reply.receiver_mac, net->dev->dev_addr, ETH_ALEN);
249 reply.receiver_mac_len = ETH_ALEN;
250
251 return tb_xdomain_response(xd, &reply, sizeof(reply),
252 TB_CFG_PKG_XDOMAIN_RESP);
253 }
254
tbnet_login_request(struct tbnet * net,u8 sequence)255 static int tbnet_login_request(struct tbnet *net, u8 sequence)
256 {
257 struct thunderbolt_ip_login_response reply;
258 struct thunderbolt_ip_login request;
259 struct tb_xdomain *xd = net->xd;
260
261 memset(&request, 0, sizeof(request));
262 tbnet_fill_header(&request.hdr, xd->route, sequence, xd->local_uuid,
263 xd->remote_uuid, TBIP_LOGIN, sizeof(request),
264 atomic_inc_return(&net->command_id));
265
266 request.proto_version = TBIP_LOGIN_PROTO_VERSION;
267 request.transmit_path = net->local_transmit_path;
268
269 return tb_xdomain_request(xd, &request, sizeof(request),
270 TB_CFG_PKG_XDOMAIN_RESP, &reply,
271 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,
272 TBNET_LOGIN_TIMEOUT);
273 }
274
tbnet_logout_response(struct tbnet * net,u64 route,u8 sequence,u32 command_id)275 static int tbnet_logout_response(struct tbnet *net, u64 route, u8 sequence,
276 u32 command_id)
277 {
278 struct thunderbolt_ip_status reply;
279 struct tb_xdomain *xd = net->xd;
280
281 memset(&reply, 0, sizeof(reply));
282 tbnet_fill_header(&reply.hdr, route, sequence, xd->local_uuid,
283 xd->remote_uuid, TBIP_STATUS, sizeof(reply),
284 atomic_inc_return(&net->command_id));
285 return tb_xdomain_response(xd, &reply, sizeof(reply),
286 TB_CFG_PKG_XDOMAIN_RESP);
287 }
288
tbnet_logout_request(struct tbnet * net)289 static int tbnet_logout_request(struct tbnet *net)
290 {
291 struct thunderbolt_ip_logout request;
292 struct thunderbolt_ip_status reply;
293 struct tb_xdomain *xd = net->xd;
294
295 memset(&request, 0, sizeof(request));
296 tbnet_fill_header(&request.hdr, xd->route, 0, xd->local_uuid,
297 xd->remote_uuid, TBIP_LOGOUT, sizeof(request),
298 atomic_inc_return(&net->command_id));
299
300 return tb_xdomain_request(xd, &request, sizeof(request),
301 TB_CFG_PKG_XDOMAIN_RESP, &reply,
302 sizeof(reply), TB_CFG_PKG_XDOMAIN_RESP,
303 TBNET_LOGOUT_TIMEOUT);
304 }
305
start_login(struct tbnet * net)306 static void start_login(struct tbnet *net)
307 {
308 mutex_lock(&net->connection_lock);
309 net->login_sent = false;
310 net->login_received = false;
311 mutex_unlock(&net->connection_lock);
312
313 queue_delayed_work(system_long_wq, &net->login_work,
314 msecs_to_jiffies(1000));
315 }
316
stop_login(struct tbnet * net)317 static void stop_login(struct tbnet *net)
318 {
319 cancel_delayed_work_sync(&net->login_work);
320 cancel_work_sync(&net->connected_work);
321 }
322
tbnet_frame_size(const struct tbnet_frame * tf)323 static inline unsigned int tbnet_frame_size(const struct tbnet_frame *tf)
324 {
325 return tf->frame.size ? : TBNET_FRAME_SIZE;
326 }
327
tbnet_free_buffers(struct tbnet_ring * ring)328 static void tbnet_free_buffers(struct tbnet_ring *ring)
329 {
330 unsigned int i;
331
332 for (i = 0; i < TBNET_RING_SIZE; i++) {
333 struct device *dma_dev = tb_ring_dma_device(ring->ring);
334 struct tbnet_frame *tf = &ring->frames[i];
335 enum dma_data_direction dir;
336 unsigned int order;
337 size_t size;
338
339 if (!tf->page)
340 continue;
341
342 if (ring->ring->is_tx) {
343 dir = DMA_TO_DEVICE;
344 order = 0;
345 size = TBNET_FRAME_SIZE;
346 } else {
347 dir = DMA_FROM_DEVICE;
348 order = TBNET_RX_PAGE_ORDER;
349 size = TBNET_RX_PAGE_SIZE;
350 }
351
352 if (tf->frame.buffer_phy)
353 dma_unmap_page(dma_dev, tf->frame.buffer_phy, size,
354 dir);
355
356 __free_pages(tf->page, order);
357 tf->page = NULL;
358 }
359
360 ring->cons = 0;
361 ring->prod = 0;
362 }
363
tbnet_tear_down(struct tbnet * net,bool send_logout)364 static void tbnet_tear_down(struct tbnet *net, bool send_logout)
365 {
366 netif_carrier_off(net->dev);
367 netif_stop_queue(net->dev);
368
369 stop_login(net);
370
371 mutex_lock(&net->connection_lock);
372
373 if (net->login_sent && net->login_received) {
374 int ret, retries = TBNET_LOGOUT_RETRIES;
375
376 while (send_logout && retries-- > 0) {
377 ret = tbnet_logout_request(net);
378 if (ret != -ETIMEDOUT)
379 break;
380 }
381
382 tb_ring_stop(net->rx_ring.ring);
383 tb_ring_stop(net->tx_ring.ring);
384 tbnet_free_buffers(&net->rx_ring);
385 tbnet_free_buffers(&net->tx_ring);
386
387 ret = tb_xdomain_disable_paths(net->xd,
388 net->local_transmit_path,
389 net->rx_ring.ring->hop,
390 net->remote_transmit_path,
391 net->tx_ring.ring->hop);
392 if (ret)
393 netdev_warn(net->dev, "failed to disable DMA paths\n");
394
395 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path);
396 net->remote_transmit_path = 0;
397 }
398
399 net->login_retries = 0;
400 net->login_sent = false;
401 net->login_received = false;
402
403 mutex_unlock(&net->connection_lock);
404 }
405
tbnet_handle_packet(const void * buf,size_t size,void * data)406 static int tbnet_handle_packet(const void *buf, size_t size, void *data)
407 {
408 const struct thunderbolt_ip_login *pkg = buf;
409 struct tbnet *net = data;
410 u32 command_id;
411 int ret = 0;
412 u32 sequence;
413 u64 route;
414
415 /* Make sure the packet is for us */
416 if (size < sizeof(struct thunderbolt_ip_header))
417 return 0;
418 if (!uuid_equal(&pkg->hdr.initiator_uuid, net->xd->remote_uuid))
419 return 0;
420 if (!uuid_equal(&pkg->hdr.target_uuid, net->xd->local_uuid))
421 return 0;
422
423 route = ((u64)pkg->hdr.route_hi << 32) | pkg->hdr.route_lo;
424 route &= ~BIT_ULL(63);
425 if (route != net->xd->route)
426 return 0;
427
428 sequence = pkg->hdr.length_sn & TBIP_HDR_SN_MASK;
429 sequence >>= TBIP_HDR_SN_SHIFT;
430 command_id = pkg->hdr.command_id;
431
432 switch (pkg->hdr.type) {
433 case TBIP_LOGIN:
434 if (!netif_running(net->dev))
435 break;
436
437 ret = tbnet_login_response(net, route, sequence,
438 pkg->hdr.command_id);
439 if (!ret) {
440 mutex_lock(&net->connection_lock);
441 net->login_received = true;
442 net->remote_transmit_path = pkg->transmit_path;
443
444 /* If we reached the number of max retries or
445 * previous logout, schedule another round of
446 * login retries
447 */
448 if (net->login_retries >= TBNET_LOGIN_RETRIES ||
449 !net->login_sent) {
450 net->login_retries = 0;
451 queue_delayed_work(system_long_wq,
452 &net->login_work, 0);
453 }
454 mutex_unlock(&net->connection_lock);
455
456 queue_work(system_long_wq, &net->connected_work);
457 }
458 break;
459
460 case TBIP_LOGOUT:
461 ret = tbnet_logout_response(net, route, sequence, command_id);
462 if (!ret)
463 queue_work(system_long_wq, &net->disconnect_work);
464 break;
465
466 default:
467 return 0;
468 }
469
470 if (ret)
471 netdev_warn(net->dev, "failed to send ThunderboltIP response\n");
472
473 return 1;
474 }
475
tbnet_available_buffers(const struct tbnet_ring * ring)476 static unsigned int tbnet_available_buffers(const struct tbnet_ring *ring)
477 {
478 return ring->prod - ring->cons;
479 }
480
tbnet_alloc_rx_buffers(struct tbnet * net,unsigned int nbuffers)481 static int tbnet_alloc_rx_buffers(struct tbnet *net, unsigned int nbuffers)
482 {
483 struct tbnet_ring *ring = &net->rx_ring;
484 int ret;
485
486 while (nbuffers--) {
487 struct device *dma_dev = tb_ring_dma_device(ring->ring);
488 unsigned int index = ring->prod & (TBNET_RING_SIZE - 1);
489 struct tbnet_frame *tf = &ring->frames[index];
490 dma_addr_t dma_addr;
491
492 if (tf->page)
493 break;
494
495 /* Allocate page (order > 0) so that it can hold maximum
496 * ThunderboltIP frame (4kB) and the additional room for
497 * SKB shared info required by build_skb().
498 */
499 tf->page = dev_alloc_pages(TBNET_RX_PAGE_ORDER);
500 if (!tf->page) {
501 ret = -ENOMEM;
502 goto err_free;
503 }
504
505 dma_addr = dma_map_page(dma_dev, tf->page, 0,
506 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);
507 if (dma_mapping_error(dma_dev, dma_addr)) {
508 ret = -ENOMEM;
509 goto err_free;
510 }
511
512 tf->frame.buffer_phy = dma_addr;
513 tf->dev = net->dev;
514
515 tb_ring_rx(ring->ring, &tf->frame);
516
517 ring->prod++;
518 }
519
520 return 0;
521
522 err_free:
523 tbnet_free_buffers(ring);
524 return ret;
525 }
526
tbnet_get_tx_buffer(struct tbnet * net)527 static struct tbnet_frame *tbnet_get_tx_buffer(struct tbnet *net)
528 {
529 struct tbnet_ring *ring = &net->tx_ring;
530 struct device *dma_dev = tb_ring_dma_device(ring->ring);
531 struct tbnet_frame *tf;
532 unsigned int index;
533
534 if (!tbnet_available_buffers(ring))
535 return NULL;
536
537 index = ring->cons++ & (TBNET_RING_SIZE - 1);
538
539 tf = &ring->frames[index];
540 tf->frame.size = 0;
541
542 dma_sync_single_for_cpu(dma_dev, tf->frame.buffer_phy,
543 tbnet_frame_size(tf), DMA_TO_DEVICE);
544
545 return tf;
546 }
547
tbnet_tx_callback(struct tb_ring * ring,struct ring_frame * frame,bool canceled)548 static void tbnet_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
549 bool canceled)
550 {
551 struct tbnet_frame *tf = container_of(frame, typeof(*tf), frame);
552 struct tbnet *net = netdev_priv(tf->dev);
553
554 /* Return buffer to the ring */
555 net->tx_ring.prod++;
556
557 if (tbnet_available_buffers(&net->tx_ring) >= TBNET_RING_SIZE / 2)
558 netif_wake_queue(net->dev);
559 }
560
tbnet_alloc_tx_buffers(struct tbnet * net)561 static int tbnet_alloc_tx_buffers(struct tbnet *net)
562 {
563 struct tbnet_ring *ring = &net->tx_ring;
564 struct device *dma_dev = tb_ring_dma_device(ring->ring);
565 unsigned int i;
566
567 for (i = 0; i < TBNET_RING_SIZE; i++) {
568 struct tbnet_frame *tf = &ring->frames[i];
569 dma_addr_t dma_addr;
570
571 tf->page = alloc_page(GFP_KERNEL);
572 if (!tf->page) {
573 tbnet_free_buffers(ring);
574 return -ENOMEM;
575 }
576
577 dma_addr = dma_map_page(dma_dev, tf->page, 0, TBNET_FRAME_SIZE,
578 DMA_TO_DEVICE);
579 if (dma_mapping_error(dma_dev, dma_addr)) {
580 __free_page(tf->page);
581 tf->page = NULL;
582 tbnet_free_buffers(ring);
583 return -ENOMEM;
584 }
585
586 tf->dev = net->dev;
587 tf->frame.buffer_phy = dma_addr;
588 tf->frame.callback = tbnet_tx_callback;
589 tf->frame.sof = TBIP_PDF_FRAME_START;
590 tf->frame.eof = TBIP_PDF_FRAME_END;
591 }
592
593 ring->cons = 0;
594 ring->prod = TBNET_RING_SIZE - 1;
595
596 return 0;
597 }
598
tbnet_connected_work(struct work_struct * work)599 static void tbnet_connected_work(struct work_struct *work)
600 {
601 struct tbnet *net = container_of(work, typeof(*net), connected_work);
602 bool connected;
603 int ret;
604
605 if (netif_carrier_ok(net->dev))
606 return;
607
608 mutex_lock(&net->connection_lock);
609 connected = net->login_sent && net->login_received;
610 mutex_unlock(&net->connection_lock);
611
612 if (!connected)
613 return;
614
615 ret = tb_xdomain_alloc_in_hopid(net->xd, net->remote_transmit_path);
616 if (ret != net->remote_transmit_path) {
617 netdev_err(net->dev, "failed to allocate Rx HopID\n");
618 return;
619 }
620
621 /* Both logins successful so enable the rings, high-speed DMA
622 * paths and start the network device queue.
623 *
624 * Note we enable the DMA paths last to make sure we have primed
625 * the Rx ring before any incoming packets are allowed to
626 * arrive.
627 */
628 tb_ring_start(net->tx_ring.ring);
629 tb_ring_start(net->rx_ring.ring);
630
631 ret = tbnet_alloc_rx_buffers(net, TBNET_RING_SIZE);
632 if (ret)
633 goto err_stop_rings;
634
635 ret = tbnet_alloc_tx_buffers(net);
636 if (ret)
637 goto err_free_rx_buffers;
638
639 ret = tb_xdomain_enable_paths(net->xd, net->local_transmit_path,
640 net->rx_ring.ring->hop,
641 net->remote_transmit_path,
642 net->tx_ring.ring->hop);
643 if (ret) {
644 netdev_err(net->dev, "failed to enable DMA paths\n");
645 goto err_free_tx_buffers;
646 }
647
648 netif_carrier_on(net->dev);
649 netif_start_queue(net->dev);
650 return;
651
652 err_free_tx_buffers:
653 tbnet_free_buffers(&net->tx_ring);
654 err_free_rx_buffers:
655 tbnet_free_buffers(&net->rx_ring);
656 err_stop_rings:
657 tb_ring_stop(net->rx_ring.ring);
658 tb_ring_stop(net->tx_ring.ring);
659 tb_xdomain_release_in_hopid(net->xd, net->remote_transmit_path);
660 }
661
tbnet_login_work(struct work_struct * work)662 static void tbnet_login_work(struct work_struct *work)
663 {
664 struct tbnet *net = container_of(work, typeof(*net), login_work.work);
665 unsigned long delay = msecs_to_jiffies(TBNET_LOGIN_DELAY);
666 int ret;
667
668 if (netif_carrier_ok(net->dev))
669 return;
670
671 ret = tbnet_login_request(net, net->login_retries % 4);
672 if (ret) {
673 if (net->login_retries++ < TBNET_LOGIN_RETRIES) {
674 queue_delayed_work(system_long_wq, &net->login_work,
675 delay);
676 } else {
677 netdev_info(net->dev, "ThunderboltIP login timed out\n");
678 }
679 } else {
680 net->login_retries = 0;
681
682 mutex_lock(&net->connection_lock);
683 net->login_sent = true;
684 mutex_unlock(&net->connection_lock);
685
686 queue_work(system_long_wq, &net->connected_work);
687 }
688 }
689
tbnet_disconnect_work(struct work_struct * work)690 static void tbnet_disconnect_work(struct work_struct *work)
691 {
692 struct tbnet *net = container_of(work, typeof(*net), disconnect_work);
693
694 tbnet_tear_down(net, false);
695 }
696
tbnet_check_frame(struct tbnet * net,const struct tbnet_frame * tf,const struct thunderbolt_ip_frame_header * hdr)697 static bool tbnet_check_frame(struct tbnet *net, const struct tbnet_frame *tf,
698 const struct thunderbolt_ip_frame_header *hdr)
699 {
700 u32 frame_id, frame_count, frame_size, frame_index;
701 unsigned int size;
702
703 if (tf->frame.flags & RING_DESC_CRC_ERROR) {
704 net->stats.rx_crc_errors++;
705 return false;
706 } else if (tf->frame.flags & RING_DESC_BUFFER_OVERRUN) {
707 net->stats.rx_over_errors++;
708 return false;
709 }
710
711 /* Should be greater than just header i.e. contains data */
712 size = tbnet_frame_size(tf);
713 if (size <= sizeof(*hdr)) {
714 net->stats.rx_length_errors++;
715 return false;
716 }
717
718 frame_count = le32_to_cpu(hdr->frame_count);
719 frame_size = le32_to_cpu(hdr->frame_size);
720 frame_index = le16_to_cpu(hdr->frame_index);
721 frame_id = le16_to_cpu(hdr->frame_id);
722
723 if ((frame_size > size - sizeof(*hdr)) || !frame_size) {
724 net->stats.rx_length_errors++;
725 return false;
726 }
727
728 /* In case we're in the middle of packet, validate the frame
729 * header based on first fragment of the packet.
730 */
731 if (net->skb && net->rx_hdr.frame_count) {
732 /* Check the frame count fits the count field */
733 if (frame_count != net->rx_hdr.frame_count) {
734 net->stats.rx_length_errors++;
735 return false;
736 }
737
738 /* Check the frame identifiers are incremented correctly,
739 * and id is matching.
740 */
741 if (frame_index != net->rx_hdr.frame_index + 1 ||
742 frame_id != net->rx_hdr.frame_id) {
743 net->stats.rx_missed_errors++;
744 return false;
745 }
746
747 if (net->skb->len + frame_size > TBNET_MAX_MTU) {
748 net->stats.rx_length_errors++;
749 return false;
750 }
751
752 return true;
753 }
754
755 /* Start of packet, validate the frame header */
756 if (frame_count == 0 || frame_count > TBNET_RING_SIZE / 4) {
757 net->stats.rx_length_errors++;
758 return false;
759 }
760 if (frame_index != 0) {
761 net->stats.rx_missed_errors++;
762 return false;
763 }
764
765 return true;
766 }
767
tbnet_poll(struct napi_struct * napi,int budget)768 static int tbnet_poll(struct napi_struct *napi, int budget)
769 {
770 struct tbnet *net = container_of(napi, struct tbnet, napi);
771 unsigned int cleaned_count = tbnet_available_buffers(&net->rx_ring);
772 struct device *dma_dev = tb_ring_dma_device(net->rx_ring.ring);
773 unsigned int rx_packets = 0;
774
775 while (rx_packets < budget) {
776 const struct thunderbolt_ip_frame_header *hdr;
777 unsigned int hdr_size = sizeof(*hdr);
778 struct sk_buff *skb = NULL;
779 struct ring_frame *frame;
780 struct tbnet_frame *tf;
781 struct page *page;
782 bool last = true;
783 u32 frame_size;
784
785 /* Return some buffers to hardware, one at a time is too
786 * slow so allocate MAX_SKB_FRAGS buffers at the same
787 * time.
788 */
789 if (cleaned_count >= MAX_SKB_FRAGS) {
790 tbnet_alloc_rx_buffers(net, cleaned_count);
791 cleaned_count = 0;
792 }
793
794 frame = tb_ring_poll(net->rx_ring.ring);
795 if (!frame)
796 break;
797
798 dma_unmap_page(dma_dev, frame->buffer_phy,
799 TBNET_RX_PAGE_SIZE, DMA_FROM_DEVICE);
800
801 tf = container_of(frame, typeof(*tf), frame);
802
803 page = tf->page;
804 tf->page = NULL;
805 net->rx_ring.cons++;
806 cleaned_count++;
807
808 hdr = page_address(page);
809 if (!tbnet_check_frame(net, tf, hdr)) {
810 __free_pages(page, TBNET_RX_PAGE_ORDER);
811 dev_kfree_skb_any(net->skb);
812 net->skb = NULL;
813 continue;
814 }
815
816 frame_size = le32_to_cpu(hdr->frame_size);
817
818 skb = net->skb;
819 if (!skb) {
820 skb = build_skb(page_address(page),
821 TBNET_RX_PAGE_SIZE);
822 if (!skb) {
823 __free_pages(page, TBNET_RX_PAGE_ORDER);
824 net->stats.rx_errors++;
825 break;
826 }
827
828 skb_reserve(skb, hdr_size);
829 skb_put(skb, frame_size);
830
831 net->skb = skb;
832 } else {
833 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
834 page, hdr_size, frame_size,
835 TBNET_RX_PAGE_SIZE - hdr_size);
836 }
837
838 net->rx_hdr.frame_size = frame_size;
839 net->rx_hdr.frame_count = le32_to_cpu(hdr->frame_count);
840 net->rx_hdr.frame_index = le16_to_cpu(hdr->frame_index);
841 net->rx_hdr.frame_id = le16_to_cpu(hdr->frame_id);
842 last = net->rx_hdr.frame_index == net->rx_hdr.frame_count - 1;
843
844 rx_packets++;
845 net->stats.rx_bytes += frame_size;
846
847 if (last) {
848 skb->protocol = eth_type_trans(skb, net->dev);
849 napi_gro_receive(&net->napi, skb);
850 net->skb = NULL;
851 }
852 }
853
854 net->stats.rx_packets += rx_packets;
855
856 if (cleaned_count)
857 tbnet_alloc_rx_buffers(net, cleaned_count);
858
859 if (rx_packets >= budget)
860 return budget;
861
862 napi_complete_done(napi, rx_packets);
863 /* Re-enable the ring interrupt */
864 tb_ring_poll_complete(net->rx_ring.ring);
865
866 return rx_packets;
867 }
868
tbnet_start_poll(void * data)869 static void tbnet_start_poll(void *data)
870 {
871 struct tbnet *net = data;
872
873 napi_schedule(&net->napi);
874 }
875
tbnet_open(struct net_device * dev)876 static int tbnet_open(struct net_device *dev)
877 {
878 struct tbnet *net = netdev_priv(dev);
879 struct tb_xdomain *xd = net->xd;
880 u16 sof_mask, eof_mask;
881 struct tb_ring *ring;
882 unsigned int flags;
883 int hopid;
884
885 netif_carrier_off(dev);
886
887 ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE,
888 RING_FLAG_FRAME);
889 if (!ring) {
890 netdev_err(dev, "failed to allocate Tx ring\n");
891 return -ENOMEM;
892 }
893 net->tx_ring.ring = ring;
894
895 hopid = tb_xdomain_alloc_out_hopid(xd, -1);
896 if (hopid < 0) {
897 netdev_err(dev, "failed to allocate Tx HopID\n");
898 tb_ring_free(net->tx_ring.ring);
899 net->tx_ring.ring = NULL;
900 return hopid;
901 }
902 net->local_transmit_path = hopid;
903
904 sof_mask = BIT(TBIP_PDF_FRAME_START);
905 eof_mask = BIT(TBIP_PDF_FRAME_END);
906
907 flags = RING_FLAG_FRAME;
908 /* Only enable full E2E if the other end supports it too */
909 if (tbnet_e2e && net->svc->prtcstns & TBNET_E2E)
910 flags |= RING_FLAG_E2E;
911
912 ring = tb_ring_alloc_rx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags,
913 net->tx_ring.ring->hop, sof_mask,
914 eof_mask, tbnet_start_poll, net);
915 if (!ring) {
916 netdev_err(dev, "failed to allocate Rx ring\n");
917 tb_xdomain_release_out_hopid(xd, hopid);
918 tb_ring_free(net->tx_ring.ring);
919 net->tx_ring.ring = NULL;
920 return -ENOMEM;
921 }
922 net->rx_ring.ring = ring;
923
924 napi_enable(&net->napi);
925 start_login(net);
926
927 return 0;
928 }
929
tbnet_stop(struct net_device * dev)930 static int tbnet_stop(struct net_device *dev)
931 {
932 struct tbnet *net = netdev_priv(dev);
933
934 napi_disable(&net->napi);
935
936 cancel_work_sync(&net->disconnect_work);
937 tbnet_tear_down(net, true);
938
939 tb_ring_free(net->rx_ring.ring);
940 net->rx_ring.ring = NULL;
941
942 tb_xdomain_release_out_hopid(net->xd, net->local_transmit_path);
943 tb_ring_free(net->tx_ring.ring);
944 net->tx_ring.ring = NULL;
945
946 return 0;
947 }
948
tbnet_xmit_csum_and_map(struct tbnet * net,struct sk_buff * skb,struct tbnet_frame ** frames,u32 frame_count)949 static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
950 struct tbnet_frame **frames, u32 frame_count)
951 {
952 struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page);
953 struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring);
954 __wsum wsum = htonl(skb->len - skb_transport_offset(skb));
955 unsigned int i, len, offset = skb_transport_offset(skb);
956 __be16 protocol = skb->protocol;
957 void *data = skb->data;
958 void *dest = hdr + 1;
959 __sum16 *tucso;
960
961 if (skb->ip_summed != CHECKSUM_PARTIAL) {
962 /* No need to calculate checksum so we just update the
963 * total frame count and sync the frames for DMA.
964 */
965 for (i = 0; i < frame_count; i++) {
966 hdr = page_address(frames[i]->page);
967 hdr->frame_count = cpu_to_le32(frame_count);
968 dma_sync_single_for_device(dma_dev,
969 frames[i]->frame.buffer_phy,
970 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
971 }
972
973 return true;
974 }
975
976 if (protocol == htons(ETH_P_8021Q)) {
977 struct vlan_hdr *vhdr, vh;
978
979 vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh);
980 if (!vhdr)
981 return false;
982
983 protocol = vhdr->h_vlan_encapsulated_proto;
984 }
985
986 /* Data points on the beginning of packet.
987 * Check is the checksum absolute place in the packet.
988 * ipcso will update IP checksum.
989 * tucso will update TCP/UPD checksum.
990 */
991 if (protocol == htons(ETH_P_IP)) {
992 __sum16 *ipcso = dest + ((void *)&(ip_hdr(skb)->check) - data);
993
994 *ipcso = 0;
995 *ipcso = ip_fast_csum(dest + skb_network_offset(skb),
996 ip_hdr(skb)->ihl);
997
998 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
999 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
1000 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
1001 tucso = dest + ((void *)&(udp_hdr(skb)->check) - data);
1002 else
1003 return false;
1004
1005 *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
1006 ip_hdr(skb)->daddr, 0,
1007 ip_hdr(skb)->protocol, 0);
1008 } else if (skb_is_gso_v6(skb)) {
1009 tucso = dest + ((void *)&(tcp_hdr(skb)->check) - data);
1010 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
1011 &ipv6_hdr(skb)->daddr, 0,
1012 IPPROTO_TCP, 0);
1013 return false;
1014 } else if (protocol == htons(ETH_P_IPV6)) {
1015 tucso = dest + skb_checksum_start_offset(skb) + skb->csum_offset;
1016 *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
1017 &ipv6_hdr(skb)->daddr, 0,
1018 ipv6_hdr(skb)->nexthdr, 0);
1019 } else {
1020 return false;
1021 }
1022
1023 /* First frame was headers, rest of the frames contain data.
1024 * Calculate checksum over each frame.
1025 */
1026 for (i = 0; i < frame_count; i++) {
1027 hdr = page_address(frames[i]->page);
1028 dest = (void *)(hdr + 1) + offset;
1029 len = le32_to_cpu(hdr->frame_size) - offset;
1030 wsum = csum_partial(dest, len, wsum);
1031 hdr->frame_count = cpu_to_le32(frame_count);
1032
1033 offset = 0;
1034 }
1035
1036 *tucso = csum_fold(wsum);
1037
1038 /* Checksum is finally calculated and we don't touch the memory
1039 * anymore, so DMA sync the frames now.
1040 */
1041 for (i = 0; i < frame_count; i++) {
1042 dma_sync_single_for_device(dma_dev, frames[i]->frame.buffer_phy,
1043 tbnet_frame_size(frames[i]), DMA_TO_DEVICE);
1044 }
1045
1046 return true;
1047 }
1048
tbnet_kmap_frag(struct sk_buff * skb,unsigned int frag_num,unsigned int * len)1049 static void *tbnet_kmap_frag(struct sk_buff *skb, unsigned int frag_num,
1050 unsigned int *len)
1051 {
1052 const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num];
1053
1054 *len = skb_frag_size(frag);
1055 return kmap_atomic(skb_frag_page(frag)) + skb_frag_off(frag);
1056 }
1057
tbnet_start_xmit(struct sk_buff * skb,struct net_device * dev)1058 static netdev_tx_t tbnet_start_xmit(struct sk_buff *skb,
1059 struct net_device *dev)
1060 {
1061 struct tbnet *net = netdev_priv(dev);
1062 struct tbnet_frame *frames[MAX_SKB_FRAGS];
1063 u16 frame_id = atomic_read(&net->frame_id);
1064 struct thunderbolt_ip_frame_header *hdr;
1065 unsigned int len = skb_headlen(skb);
1066 unsigned int data_len = skb->len;
1067 unsigned int nframes, i;
1068 unsigned int frag = 0;
1069 void *src = skb->data;
1070 u32 frame_index = 0;
1071 bool unmap = false;
1072 void *dest;
1073
1074 nframes = DIV_ROUND_UP(data_len, TBNET_MAX_PAYLOAD_SIZE);
1075 if (tbnet_available_buffers(&net->tx_ring) < nframes) {
1076 netif_stop_queue(net->dev);
1077 return NETDEV_TX_BUSY;
1078 }
1079
1080 frames[frame_index] = tbnet_get_tx_buffer(net);
1081 if (!frames[frame_index])
1082 goto err_drop;
1083
1084 hdr = page_address(frames[frame_index]->page);
1085 dest = hdr + 1;
1086
1087 /* If overall packet is bigger than the frame data size */
1088 while (data_len > TBNET_MAX_PAYLOAD_SIZE) {
1089 unsigned int size_left = TBNET_MAX_PAYLOAD_SIZE;
1090
1091 hdr->frame_size = cpu_to_le32(TBNET_MAX_PAYLOAD_SIZE);
1092 hdr->frame_index = cpu_to_le16(frame_index);
1093 hdr->frame_id = cpu_to_le16(frame_id);
1094
1095 do {
1096 if (len > size_left) {
1097 /* Copy data onto Tx buffer data with
1098 * full frame size then break and go to
1099 * next frame
1100 */
1101 memcpy(dest, src, size_left);
1102 len -= size_left;
1103 dest += size_left;
1104 src += size_left;
1105 break;
1106 }
1107
1108 memcpy(dest, src, len);
1109 size_left -= len;
1110 dest += len;
1111
1112 if (unmap) {
1113 kunmap_atomic(src);
1114 unmap = false;
1115 }
1116
1117 /* Ensure all fragments have been processed */
1118 if (frag < skb_shinfo(skb)->nr_frags) {
1119 /* Map and then unmap quickly */
1120 src = tbnet_kmap_frag(skb, frag++, &len);
1121 unmap = true;
1122 } else if (unlikely(size_left > 0)) {
1123 goto err_drop;
1124 }
1125 } while (size_left > 0);
1126
1127 data_len -= TBNET_MAX_PAYLOAD_SIZE;
1128 frame_index++;
1129
1130 frames[frame_index] = tbnet_get_tx_buffer(net);
1131 if (!frames[frame_index])
1132 goto err_drop;
1133
1134 hdr = page_address(frames[frame_index]->page);
1135 dest = hdr + 1;
1136 }
1137
1138 hdr->frame_size = cpu_to_le32(data_len);
1139 hdr->frame_index = cpu_to_le16(frame_index);
1140 hdr->frame_id = cpu_to_le16(frame_id);
1141
1142 frames[frame_index]->frame.size = data_len + sizeof(*hdr);
1143
1144 /* In case the remaining data_len is smaller than a frame */
1145 while (len < data_len) {
1146 memcpy(dest, src, len);
1147 data_len -= len;
1148 dest += len;
1149
1150 if (unmap) {
1151 kunmap_atomic(src);
1152 unmap = false;
1153 }
1154
1155 if (frag < skb_shinfo(skb)->nr_frags) {
1156 src = tbnet_kmap_frag(skb, frag++, &len);
1157 unmap = true;
1158 } else if (unlikely(data_len > 0)) {
1159 goto err_drop;
1160 }
1161 }
1162
1163 memcpy(dest, src, data_len);
1164
1165 if (unmap)
1166 kunmap_atomic(src);
1167
1168 if (!tbnet_xmit_csum_and_map(net, skb, frames, frame_index + 1))
1169 goto err_drop;
1170
1171 for (i = 0; i < frame_index + 1; i++)
1172 tb_ring_tx(net->tx_ring.ring, &frames[i]->frame);
1173
1174 if (net->svc->prtcstns & TBNET_MATCH_FRAGS_ID)
1175 atomic_inc(&net->frame_id);
1176
1177 net->stats.tx_packets++;
1178 net->stats.tx_bytes += skb->len;
1179
1180 dev_consume_skb_any(skb);
1181
1182 return NETDEV_TX_OK;
1183
1184 err_drop:
1185 /* We can re-use the buffers */
1186 net->tx_ring.cons -= frame_index;
1187
1188 dev_kfree_skb_any(skb);
1189 net->stats.tx_errors++;
1190
1191 return NETDEV_TX_OK;
1192 }
1193
tbnet_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)1194 static void tbnet_get_stats64(struct net_device *dev,
1195 struct rtnl_link_stats64 *stats)
1196 {
1197 struct tbnet *net = netdev_priv(dev);
1198
1199 stats->tx_packets = net->stats.tx_packets;
1200 stats->rx_packets = net->stats.rx_packets;
1201 stats->tx_bytes = net->stats.tx_bytes;
1202 stats->rx_bytes = net->stats.rx_bytes;
1203 stats->rx_errors = net->stats.rx_errors + net->stats.rx_length_errors +
1204 net->stats.rx_over_errors + net->stats.rx_crc_errors +
1205 net->stats.rx_missed_errors;
1206 stats->tx_errors = net->stats.tx_errors;
1207 stats->rx_length_errors = net->stats.rx_length_errors;
1208 stats->rx_over_errors = net->stats.rx_over_errors;
1209 stats->rx_crc_errors = net->stats.rx_crc_errors;
1210 stats->rx_missed_errors = net->stats.rx_missed_errors;
1211 }
1212
1213 static const struct net_device_ops tbnet_netdev_ops = {
1214 .ndo_open = tbnet_open,
1215 .ndo_stop = tbnet_stop,
1216 .ndo_start_xmit = tbnet_start_xmit,
1217 .ndo_get_stats64 = tbnet_get_stats64,
1218 };
1219
tbnet_generate_mac(struct net_device * dev)1220 static void tbnet_generate_mac(struct net_device *dev)
1221 {
1222 const struct tbnet *net = netdev_priv(dev);
1223 const struct tb_xdomain *xd = net->xd;
1224 u8 addr[ETH_ALEN];
1225 u8 phy_port;
1226 u32 hash;
1227
1228 phy_port = tb_phy_port_from_link(TBNET_L0_PORT_NUM(xd->route));
1229
1230 /* Unicast and locally administered MAC */
1231 addr[0] = phy_port << 4 | 0x02;
1232 hash = jhash2((u32 *)xd->local_uuid, 4, 0);
1233 memcpy(addr + 1, &hash, sizeof(hash));
1234 hash = jhash2((u32 *)xd->local_uuid, 4, hash);
1235 addr[5] = hash & 0xff;
1236 eth_hw_addr_set(dev, addr);
1237 }
1238
tbnet_probe(struct tb_service * svc,const struct tb_service_id * id)1239 static int tbnet_probe(struct tb_service *svc, const struct tb_service_id *id)
1240 {
1241 struct tb_xdomain *xd = tb_service_parent(svc);
1242 struct net_device *dev;
1243 struct tbnet *net;
1244 int ret;
1245
1246 dev = alloc_etherdev(sizeof(*net));
1247 if (!dev)
1248 return -ENOMEM;
1249
1250 SET_NETDEV_DEV(dev, &svc->dev);
1251
1252 net = netdev_priv(dev);
1253 INIT_DELAYED_WORK(&net->login_work, tbnet_login_work);
1254 INIT_WORK(&net->connected_work, tbnet_connected_work);
1255 INIT_WORK(&net->disconnect_work, tbnet_disconnect_work);
1256 mutex_init(&net->connection_lock);
1257 atomic_set(&net->command_id, 0);
1258 atomic_set(&net->frame_id, 0);
1259 net->svc = svc;
1260 net->dev = dev;
1261 net->xd = xd;
1262
1263 tbnet_generate_mac(dev);
1264
1265 strcpy(dev->name, "thunderbolt%d");
1266 dev->netdev_ops = &tbnet_netdev_ops;
1267
1268 /* ThunderboltIP takes advantage of TSO packets but instead of
1269 * segmenting them we just split the packet into Thunderbolt
1270 * frames (maximum payload size of each frame is 4084 bytes) and
1271 * calculate checksum over the whole packet here.
1272 *
1273 * The receiving side does the opposite if the host OS supports
1274 * LRO, otherwise it needs to split the large packet into MTU
1275 * sized smaller packets.
1276 *
1277 * In order to receive large packets from the networking stack,
1278 * we need to announce support for most of the offloading
1279 * features here.
1280 */
1281 dev->hw_features = NETIF_F_SG | NETIF_F_ALL_TSO | NETIF_F_GRO |
1282 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1283 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1284 dev->hard_header_len += sizeof(struct thunderbolt_ip_frame_header);
1285
1286 netif_napi_add(dev, &net->napi, tbnet_poll);
1287
1288 /* MTU range: 68 - 65522 */
1289 dev->min_mtu = ETH_MIN_MTU;
1290 dev->max_mtu = TBNET_MAX_MTU - ETH_HLEN;
1291
1292 net->handler.uuid = &tbnet_svc_uuid;
1293 net->handler.callback = tbnet_handle_packet;
1294 net->handler.data = net;
1295 tb_register_protocol_handler(&net->handler);
1296
1297 tb_service_set_drvdata(svc, net);
1298
1299 ret = register_netdev(dev);
1300 if (ret) {
1301 tb_unregister_protocol_handler(&net->handler);
1302 free_netdev(dev);
1303 return ret;
1304 }
1305
1306 return 0;
1307 }
1308
tbnet_remove(struct tb_service * svc)1309 static void tbnet_remove(struct tb_service *svc)
1310 {
1311 struct tbnet *net = tb_service_get_drvdata(svc);
1312
1313 unregister_netdev(net->dev);
1314 tb_unregister_protocol_handler(&net->handler);
1315 free_netdev(net->dev);
1316 }
1317
tbnet_shutdown(struct tb_service * svc)1318 static void tbnet_shutdown(struct tb_service *svc)
1319 {
1320 tbnet_tear_down(tb_service_get_drvdata(svc), true);
1321 }
1322
tbnet_suspend(struct device * dev)1323 static int __maybe_unused tbnet_suspend(struct device *dev)
1324 {
1325 struct tb_service *svc = tb_to_service(dev);
1326 struct tbnet *net = tb_service_get_drvdata(svc);
1327
1328 stop_login(net);
1329 if (netif_running(net->dev)) {
1330 netif_device_detach(net->dev);
1331 tbnet_tear_down(net, true);
1332 }
1333
1334 tb_unregister_protocol_handler(&net->handler);
1335 return 0;
1336 }
1337
tbnet_resume(struct device * dev)1338 static int __maybe_unused tbnet_resume(struct device *dev)
1339 {
1340 struct tb_service *svc = tb_to_service(dev);
1341 struct tbnet *net = tb_service_get_drvdata(svc);
1342
1343 tb_register_protocol_handler(&net->handler);
1344
1345 netif_carrier_off(net->dev);
1346 if (netif_running(net->dev)) {
1347 netif_device_attach(net->dev);
1348 start_login(net);
1349 }
1350
1351 return 0;
1352 }
1353
1354 static const struct dev_pm_ops tbnet_pm_ops = {
1355 SET_SYSTEM_SLEEP_PM_OPS(tbnet_suspend, tbnet_resume)
1356 };
1357
1358 static const struct tb_service_id tbnet_ids[] = {
1359 { TB_SERVICE("network", 1) },
1360 { },
1361 };
1362 MODULE_DEVICE_TABLE(tbsvc, tbnet_ids);
1363
1364 static struct tb_service_driver tbnet_driver = {
1365 .driver = {
1366 .owner = THIS_MODULE,
1367 .name = "thunderbolt-net",
1368 .pm = &tbnet_pm_ops,
1369 },
1370 .probe = tbnet_probe,
1371 .remove = tbnet_remove,
1372 .shutdown = tbnet_shutdown,
1373 .id_table = tbnet_ids,
1374 };
1375
tbnet_init(void)1376 static int __init tbnet_init(void)
1377 {
1378 unsigned int flags;
1379 int ret;
1380
1381 tbnet_dir = tb_property_create_dir(&tbnet_dir_uuid);
1382 if (!tbnet_dir)
1383 return -ENOMEM;
1384
1385 tb_property_add_immediate(tbnet_dir, "prtcid", 1);
1386 tb_property_add_immediate(tbnet_dir, "prtcvers", 1);
1387 tb_property_add_immediate(tbnet_dir, "prtcrevs", 1);
1388
1389 flags = TBNET_MATCH_FRAGS_ID | TBNET_64K_FRAMES;
1390 if (tbnet_e2e)
1391 flags |= TBNET_E2E;
1392 tb_property_add_immediate(tbnet_dir, "prtcstns", flags);
1393
1394 ret = tb_register_property_dir("network", tbnet_dir);
1395 if (ret)
1396 goto err_free_dir;
1397
1398 ret = tb_register_service_driver(&tbnet_driver);
1399 if (ret)
1400 goto err_unregister;
1401
1402 return 0;
1403
1404 err_unregister:
1405 tb_unregister_property_dir("network", tbnet_dir);
1406 err_free_dir:
1407 tb_property_free_dir(tbnet_dir);
1408
1409 return ret;
1410 }
1411 module_init(tbnet_init);
1412
tbnet_exit(void)1413 static void __exit tbnet_exit(void)
1414 {
1415 tb_unregister_service_driver(&tbnet_driver);
1416 tb_unregister_property_dir("network", tbnet_dir);
1417 tb_property_free_dir(tbnet_dir);
1418 }
1419 module_exit(tbnet_exit);
1420
1421 MODULE_AUTHOR("Amir Levy <amir.jer.levy@intel.com>");
1422 MODULE_AUTHOR("Michael Jamet <michael.jamet@intel.com>");
1423 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1424 MODULE_DESCRIPTION("Thunderbolt/USB4 network driver");
1425 MODULE_LICENSE("GPL v2");
1426
