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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#include "trace.h"
27
28/* Protocol timeouts in ms */
29#define TBNET_LOGIN_DELAY 4500
30#define TBNET_LOGIN_TIMEOUT 500
31#define TBNET_LOGOUT_TIMEOUT 1000
32
33#define TBNET_RING_SIZE 256
34#define TBNET_LOGIN_RETRIES 60
35#define TBNET_LOGOUT_RETRIES 10
36#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_64K
40#define TBNET_FRAME_SIZE SZ_4K
41#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 frame
53 * @frame_size: size of the data with the frame
54 * @frame_index: running index on the frames
55 * @frame_id: ID of the frame to match frames to specific packet
56 * @frame_count: how many frames assembles a full packet
57 *
58 * Each data frame passed to the high-speed DMA ring has this header. If
59 * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is
60 * 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 27
95
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 1
104
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 data
150 * @svc: XDomain service the driver is bound to
151 * @xd: XDomain the service belongs to
152 * @handler: ThunderboltIP configuration protocol handler
153 * @dev: Networking device
154 * @napi: NAPI structure for Rx polling
155 * @stats: Network statistics
156 * @skb: Network packet that is currently processed on Rx path
157 * @command_id: ID used for next configuration protocol packet
158 * @login_sent: ThunderboltIP login message successfully sent
159 * @login_received: ThunderboltIP login message received from the remote
160 * host
161 * @local_transmit_path: HopID we are using to send out packets
162 * @remote_transmit_path: HopID the other end is using to send packets to us
163 * @connection_lock: Lock serializing access to @login_sent,
164 * @login_received and @transmit_path.
165 * @login_retries: Number of login retries currently done
166 * @login_work: Worker to send ThunderboltIP login packets
167 * @connected_work: Worker that finalizes the ThunderboltIP connection
168 * setup and enables DMA paths for high speed data
169 * transfers
170 * @disconnect_work: Worker that handles tearing down the ThunderboltIP
171 * connection
172 * @rx_hdr: Copy of the currently processed Rx frame. Used when a
173 * network packet consists of multiple Thunderbolt frames.
174 * In host byte order.
175 * @rx_ring: Software ring holding Rx frames
176 * @frame_id: Frame ID use for next Tx packet
177 * (if %TBNET_MATCH_FRAGS_ID is supported in both ends)
178 * @tx_ring: Software ring holding Tx frames
179 */
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 or
460 * previous logout, schedule another round of
461 * login retries
462 */
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 maximum
514 * ThunderboltIP frame (4kB) and the additional room for
515 * 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 DMA
647 * paths and start the network device queue.
648 *
649 * Note we enable the DMA paths last to make sure we have primed
650 * the Rx ring before any incoming packets are allowed to
651 * 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 frame
763 * 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 too
820 * slow so allocate MAX_SKB_FRAGS buffers at the same
821 * 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 the
1005 * 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 else
1047 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 memory
1084 * 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 with
1145 * full frame size then break and go to
1146 * next frame
1147 */
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 of
1317 * segmenting them we just split the packet into Thunderbolt
1318 * frames (maximum payload size of each frame is 4084 bytes) and
1319 * calculate checksum over the whole packet here.
1320 *
1321 * The receiving side does the opposite if the host OS supports
1322 * LRO, otherwise it needs to split the large packet into MTU
1323 * 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 offloading
1327 * 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");