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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * USB-to-WWAN Driver for Sierra Wireless modems
4 *
5 * Copyright (C) 2008, 2009, 2010 Paxton Smith, Matthew Safar, Rory Filer
6 * <linux@sierrawireless.com>
7 *
8 * Portions of this based on the cdc_ether driver by David Brownell (2003-2005)
9 * and Ole Andre Vadla Ravnas (ActiveSync) (2006).
10 *
11 * IMPORTANT DISCLAIMER: This driver is not commercially supported by
12 * Sierra Wireless. Use at your own risk.
13 */
14
15#define DRIVER_VERSION "v.2.0"
16#define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
17#define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
18static const char driver_name[] = "sierra_net";
19
20/* if defined debug messages enabled */
21/*#define DEBUG*/
22
23#include <linux/module.h>
24#include <linux/etherdevice.h>
25#include <linux/ethtool.h>
26#include <linux/mii.h>
27#include <linux/sched.h>
28#include <linux/timer.h>
29#include <linux/usb.h>
30#include <linux/usb/cdc.h>
31#include <net/ip.h>
32#include <net/udp.h>
33#include <asm/unaligned.h>
34#include <linux/usb/usbnet.h>
35
36#define SWI_USB_REQUEST_GET_FW_ATTR 0x06
37#define SWI_GET_FW_ATTR_MASK 0x08
38
39/* atomic counter partially included in MAC address to make sure 2 devices
40 * do not end up with the same MAC - concept breaks in case of > 255 ifaces
41 */
42static atomic_t iface_counter = ATOMIC_INIT(0);
43
44/*
45 * SYNC Timer Delay definition used to set the expiry time
46 */
47#define SIERRA_NET_SYNCDELAY (2*HZ)
48
49/* Max. MTU supported. The modem buffers are limited to 1500 */
50#define SIERRA_NET_MAX_SUPPORTED_MTU 1500
51
52/* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
53 * message reception ... and thus the max. received packet.
54 * (May be the cause for parse_hip returning -EINVAL)
55 */
56#define SIERRA_NET_USBCTL_BUF_LEN 1024
57
58/* Overriding the default usbnet rx_urb_size */
59#define SIERRA_NET_RX_URB_SIZE (8 * 1024)
60
61/* Private data structure */
62struct sierra_net_data {
63
64 u16 link_up; /* air link up or down */
65 u8 tx_hdr_template[4]; /* part of HIP hdr for tx'd packets */
66
67 u8 sync_msg[4]; /* SYNC message */
68 u8 shdwn_msg[4]; /* Shutdown message */
69
70 /* Backpointer to the container */
71 struct usbnet *usbnet;
72
73 u8 ifnum; /* interface number */
74
75/* Bit masks, must be a power of 2 */
76#define SIERRA_NET_EVENT_RESP_AVAIL 0x01
77#define SIERRA_NET_TIMER_EXPIRY 0x02
78 unsigned long kevent_flags;
79 struct work_struct sierra_net_kevent;
80 struct timer_list sync_timer; /* For retrying SYNC sequence */
81};
82
83struct param {
84 int is_present;
85 union {
86 void *ptr;
87 u32 dword;
88 u16 word;
89 u8 byte;
90 };
91};
92
93/* HIP message type */
94#define SIERRA_NET_HIP_EXTENDEDID 0x7F
95#define SIERRA_NET_HIP_HSYNC_ID 0x60 /* Modem -> host */
96#define SIERRA_NET_HIP_RESTART_ID 0x62 /* Modem -> host */
97#define SIERRA_NET_HIP_MSYNC_ID 0x20 /* Host -> modem */
98#define SIERRA_NET_HIP_SHUTD_ID 0x26 /* Host -> modem */
99
100#define SIERRA_NET_HIP_EXT_IP_IN_ID 0x0202
101#define SIERRA_NET_HIP_EXT_IP_OUT_ID 0x0002
102
103/* 3G UMTS Link Sense Indication definitions */
104#define SIERRA_NET_HIP_LSI_UMTSID 0x78
105
106/* Reverse Channel Grant Indication HIP message */
107#define SIERRA_NET_HIP_RCGI 0x64
108
109/* LSI Protocol types */
110#define SIERRA_NET_PROTOCOL_UMTS 0x01
111#define SIERRA_NET_PROTOCOL_UMTS_DS 0x04
112/* LSI Coverage */
113#define SIERRA_NET_COVERAGE_NONE 0x00
114#define SIERRA_NET_COVERAGE_NOPACKET 0x01
115
116/* LSI Session */
117#define SIERRA_NET_SESSION_IDLE 0x00
118/* LSI Link types */
119#define SIERRA_NET_AS_LINK_TYPE_IPV4 0x00
120#define SIERRA_NET_AS_LINK_TYPE_IPV6 0x02
121
122struct lsi_umts {
123 u8 protocol;
124 u8 unused1;
125 __be16 length;
126 /* eventually use a union for the rest - assume umts for now */
127 u8 coverage;
128 u8 network_len; /* network name len */
129 u8 network[40]; /* network name (UCS2, bigendian) */
130 u8 session_state;
131 u8 unused3[33];
132} __packed;
133
134struct lsi_umts_single {
135 struct lsi_umts lsi;
136 u8 link_type;
137 u8 pdp_addr_len; /* NW-supplied PDP address len */
138 u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
139 u8 unused4[23];
140 u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
141 u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
142 u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
143 u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
144 u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
145 u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
146 u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
147 u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
148 u8 unused5[4];
149 u8 gw_addr_len; /* NW-supplied GW address len */
150 u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
151 u8 reserved[8];
152} __packed;
153
154struct lsi_umts_dual {
155 struct lsi_umts lsi;
156 u8 pdp_addr4_len; /* NW-supplied PDP IPv4 address len */
157 u8 pdp_addr4[4]; /* NW-supplied PDP IPv4 address (bigendian)) */
158 u8 pdp_addr6_len; /* NW-supplied PDP IPv6 address len */
159 u8 pdp_addr6[16]; /* NW-supplied PDP IPv6 address (bigendian)) */
160 u8 unused4[23];
161 u8 dns1_addr4_len; /* NW-supplied 1st DNS v4 address len (bigendian) */
162 u8 dns1_addr4[4]; /* NW-supplied 1st DNS v4 address */
163 u8 dns1_addr6_len; /* NW-supplied 1st DNS v6 address len */
164 u8 dns1_addr6[16]; /* NW-supplied 1st DNS v6 address (bigendian)*/
165 u8 dns2_addr4_len; /* NW-supplied 2nd DNS v4 address len (bigendian) */
166 u8 dns2_addr4[4]; /* NW-supplied 2nd DNS v4 address */
167 u8 dns2_addr6_len; /* NW-supplied 2nd DNS v6 address len */
168 u8 dns2_addr6[16]; /* NW-supplied 2nd DNS v6 address (bigendian)*/
169 u8 unused5[68];
170} __packed;
171
172#define SIERRA_NET_LSI_COMMON_LEN 4
173#define SIERRA_NET_LSI_UMTS_LEN (sizeof(struct lsi_umts_single))
174#define SIERRA_NET_LSI_UMTS_STATUS_LEN \
175 (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
176#define SIERRA_NET_LSI_UMTS_DS_LEN (sizeof(struct lsi_umts_dual))
177#define SIERRA_NET_LSI_UMTS_DS_STATUS_LEN \
178 (SIERRA_NET_LSI_UMTS_DS_LEN - SIERRA_NET_LSI_COMMON_LEN)
179
180/* Our own net device operations structure */
181static const struct net_device_ops sierra_net_device_ops = {
182 .ndo_open = usbnet_open,
183 .ndo_stop = usbnet_stop,
184 .ndo_start_xmit = usbnet_start_xmit,
185 .ndo_tx_timeout = usbnet_tx_timeout,
186 .ndo_change_mtu = usbnet_change_mtu,
187 .ndo_get_stats64 = dev_get_tstats64,
188 .ndo_set_mac_address = eth_mac_addr,
189 .ndo_validate_addr = eth_validate_addr,
190};
191
192/* get private data associated with passed in usbnet device */
193static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
194{
195 return (struct sierra_net_data *)dev->data[0];
196}
197
198/* set private data associated with passed in usbnet device */
199static inline void sierra_net_set_private(struct usbnet *dev,
200 struct sierra_net_data *priv)
201{
202 dev->data[0] = (unsigned long)priv;
203}
204
205/* is packet IPv4/IPv6 */
206static inline int is_ip(struct sk_buff *skb)
207{
208 return skb->protocol == cpu_to_be16(ETH_P_IP) ||
209 skb->protocol == cpu_to_be16(ETH_P_IPV6);
210}
211
212/*
213 * check passed in packet and make sure that:
214 * - it is linear (no scatter/gather)
215 * - it is ethernet (mac_header properly set)
216 */
217static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
218{
219 skb_reset_mac_header(skb); /* ethernet header */
220
221 if (skb_is_nonlinear(skb)) {
222 netdev_err(dev->net, "Non linear buffer-dropping\n");
223 return 0;
224 }
225
226 if (!pskb_may_pull(skb, ETH_HLEN))
227 return 0;
228 skb->protocol = eth_hdr(skb)->h_proto;
229
230 return 1;
231}
232
233static const u8 *save16bit(struct param *p, const u8 *datap)
234{
235 p->is_present = 1;
236 p->word = get_unaligned_be16(datap);
237 return datap + sizeof(p->word);
238}
239
240static const u8 *save8bit(struct param *p, const u8 *datap)
241{
242 p->is_present = 1;
243 p->byte = *datap;
244 return datap + sizeof(p->byte);
245}
246
247/*----------------------------------------------------------------------------*
248 * BEGIN HIP *
249 *----------------------------------------------------------------------------*/
250/* HIP header */
251#define SIERRA_NET_HIP_HDR_LEN 4
252/* Extended HIP header */
253#define SIERRA_NET_HIP_EXT_HDR_LEN 6
254
255struct hip_hdr {
256 int hdrlen;
257 struct param payload_len;
258 struct param msgid;
259 struct param msgspecific;
260 struct param extmsgid;
261};
262
263static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
264{
265 const u8 *curp = buf;
266 int padded;
267
268 if (buflen < SIERRA_NET_HIP_HDR_LEN)
269 return -EPROTO;
270
271 curp = save16bit(&hh->payload_len, curp);
272 curp = save8bit(&hh->msgid, curp);
273 curp = save8bit(&hh->msgspecific, curp);
274
275 padded = hh->msgid.byte & 0x80;
276 hh->msgid.byte &= 0x7F; /* 7 bits */
277
278 hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
279 if (hh->extmsgid.is_present) {
280 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
281 return -EPROTO;
282
283 hh->payload_len.word &= 0x3FFF; /* 14 bits */
284
285 curp = save16bit(&hh->extmsgid, curp);
286 hh->extmsgid.word &= 0x03FF; /* 10 bits */
287
288 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
289 } else {
290 hh->payload_len.word &= 0x07FF; /* 11 bits */
291 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
292 }
293
294 if (padded) {
295 hh->hdrlen++;
296 hh->payload_len.word--;
297 }
298
299 /* if real packet shorter than the claimed length */
300 if (buflen < (hh->hdrlen + hh->payload_len.word))
301 return -EINVAL;
302
303 return 0;
304}
305
306static void build_hip(u8 *buf, const u16 payloadlen,
307 struct sierra_net_data *priv)
308{
309 /* the following doesn't have the full functionality. We
310 * currently build only one kind of header, so it is faster this way
311 */
312 put_unaligned_be16(payloadlen, buf);
313 memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
314}
315/*----------------------------------------------------------------------------*
316 * END HIP *
317 *----------------------------------------------------------------------------*/
318
319static int sierra_net_send_cmd(struct usbnet *dev,
320 u8 *cmd, int cmdlen, const char * cmd_name)
321{
322 struct sierra_net_data *priv = sierra_net_get_private(dev);
323 int status;
324
325 status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
326 USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
327 0, priv->ifnum, cmd, cmdlen);
328
329 if (status != cmdlen && status != -ENODEV)
330 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
331
332 return status;
333}
334
335static int sierra_net_send_sync(struct usbnet *dev)
336{
337 int status;
338 struct sierra_net_data *priv = sierra_net_get_private(dev);
339
340 dev_dbg(&dev->udev->dev, "%s", __func__);
341
342 status = sierra_net_send_cmd(dev, priv->sync_msg,
343 sizeof(priv->sync_msg), "SYNC");
344
345 return status;
346}
347
348static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
349{
350 dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
351 priv->tx_hdr_template[0] = 0x3F;
352 priv->tx_hdr_template[1] = ctx_ix;
353 *((__be16 *)&priv->tx_hdr_template[2]) =
354 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
355}
356
357static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
358{
359 struct lsi_umts *lsi = (struct lsi_umts *)data;
360 u32 expected_length;
361
362 if (datalen < sizeof(struct lsi_umts_single)) {
363 netdev_err(dev->net, "%s: Data length %d, exp >= %zu\n",
364 __func__, datalen, sizeof(struct lsi_umts_single));
365 return -1;
366 }
367
368 /* Validate the session state */
369 if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
370 netdev_err(dev->net, "Session idle, 0x%02x\n",
371 lsi->session_state);
372 return 0;
373 }
374
375 /* Validate the protocol - only support UMTS for now */
376 if (lsi->protocol == SIERRA_NET_PROTOCOL_UMTS) {
377 struct lsi_umts_single *single = (struct lsi_umts_single *)lsi;
378
379 /* Validate the link type */
380 if (single->link_type != SIERRA_NET_AS_LINK_TYPE_IPV4 &&
381 single->link_type != SIERRA_NET_AS_LINK_TYPE_IPV6) {
382 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
383 single->link_type);
384 return -1;
385 }
386 expected_length = SIERRA_NET_LSI_UMTS_STATUS_LEN;
387 } else if (lsi->protocol == SIERRA_NET_PROTOCOL_UMTS_DS) {
388 expected_length = SIERRA_NET_LSI_UMTS_DS_STATUS_LEN;
389 } else {
390 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
391 lsi->protocol);
392 return -1;
393 }
394
395 if (be16_to_cpu(lsi->length) != expected_length) {
396 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
397 __func__, be16_to_cpu(lsi->length), expected_length);
398 return -1;
399 }
400
401 /* Validate the coverage */
402 if (lsi->coverage == SIERRA_NET_COVERAGE_NONE ||
403 lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
404 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
405 return 0;
406 }
407
408 /* Set link_sense true */
409 return 1;
410}
411
412static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
413 struct hip_hdr *hh)
414{
415 struct sierra_net_data *priv = sierra_net_get_private(dev);
416 int link_up;
417
418 link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
419 hh->payload_len.word);
420 if (link_up < 0) {
421 netdev_err(dev->net, "Invalid LSI\n");
422 return;
423 }
424 if (link_up) {
425 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
426 priv->link_up = 1;
427 } else {
428 priv->link_up = 0;
429 }
430 usbnet_link_change(dev, link_up, 0);
431}
432
433static void sierra_net_dosync(struct usbnet *dev)
434{
435 int status;
436 struct sierra_net_data *priv = sierra_net_get_private(dev);
437
438 dev_dbg(&dev->udev->dev, "%s", __func__);
439
440 /* The SIERRA_NET_HIP_MSYNC_ID command appears to request that the
441 * firmware restart itself. After restarting, the modem will respond
442 * with the SIERRA_NET_HIP_RESTART_ID indication. The driver continues
443 * sending MSYNC commands every few seconds until it receives the
444 * RESTART event from the firmware
445 */
446
447 /* tell modem we are ready */
448 status = sierra_net_send_sync(dev);
449 if (status < 0)
450 netdev_err(dev->net,
451 "Send SYNC failed, status %d\n", status);
452 status = sierra_net_send_sync(dev);
453 if (status < 0)
454 netdev_err(dev->net,
455 "Send SYNC failed, status %d\n", status);
456
457 /* Now, start a timer and make sure we get the Restart Indication */
458 priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
459 add_timer(&priv->sync_timer);
460}
461
462static void sierra_net_kevent(struct work_struct *work)
463{
464 struct sierra_net_data *priv =
465 container_of(work, struct sierra_net_data, sierra_net_kevent);
466 struct usbnet *dev = priv->usbnet;
467 int len;
468 int err;
469 u8 *buf;
470 u8 ifnum;
471
472 if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
473 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
474
475 /* Query the modem for the LSI message */
476 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
477 if (!buf)
478 return;
479
480 ifnum = priv->ifnum;
481 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
482 USB_CDC_GET_ENCAPSULATED_RESPONSE,
483 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
484 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
485 USB_CTRL_SET_TIMEOUT);
486
487 if (len < 0) {
488 netdev_err(dev->net,
489 "usb_control_msg failed, status %d\n", len);
490 } else {
491 struct hip_hdr hh;
492
493 dev_dbg(&dev->udev->dev, "%s: Received status message,"
494 " %04x bytes", __func__, len);
495
496 err = parse_hip(buf, len, &hh);
497 if (err) {
498 netdev_err(dev->net, "%s: Bad packet,"
499 " parse result %d\n", __func__, err);
500 kfree(buf);
501 return;
502 }
503
504 /* Validate packet length */
505 if (len != hh.hdrlen + hh.payload_len.word) {
506 netdev_err(dev->net, "%s: Bad packet, received"
507 " %d, expected %d\n", __func__, len,
508 hh.hdrlen + hh.payload_len.word);
509 kfree(buf);
510 return;
511 }
512
513 /* Switch on received message types */
514 switch (hh.msgid.byte) {
515 case SIERRA_NET_HIP_LSI_UMTSID:
516 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
517 hh.msgspecific.byte);
518 sierra_net_handle_lsi(dev, buf, &hh);
519 break;
520 case SIERRA_NET_HIP_RESTART_ID:
521 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
522 " stopping sync timer",
523 hh.msgspecific.byte);
524 /* Got sync resp - stop timer & clear mask */
525 del_timer_sync(&priv->sync_timer);
526 clear_bit(SIERRA_NET_TIMER_EXPIRY,
527 &priv->kevent_flags);
528 break;
529 case SIERRA_NET_HIP_HSYNC_ID:
530 dev_dbg(&dev->udev->dev, "SYNC received");
531 err = sierra_net_send_sync(dev);
532 if (err < 0)
533 netdev_err(dev->net,
534 "Send SYNC failed %d\n", err);
535 break;
536 case SIERRA_NET_HIP_EXTENDEDID:
537 netdev_err(dev->net, "Unrecognized HIP msg, "
538 "extmsgid 0x%04x\n", hh.extmsgid.word);
539 break;
540 case SIERRA_NET_HIP_RCGI:
541 /* Ignored */
542 break;
543 default:
544 netdev_err(dev->net, "Unrecognized HIP msg, "
545 "msgid 0x%02x\n", hh.msgid.byte);
546 break;
547 }
548 }
549 kfree(buf);
550 }
551 /* The sync timer bit might be set */
552 if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
553 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
554 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
555 sierra_net_dosync(priv->usbnet);
556 }
557
558 if (priv->kevent_flags)
559 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
560 "kevent_flags = 0x%lx", priv->kevent_flags);
561}
562
563static void sierra_net_defer_kevent(struct usbnet *dev, int work)
564{
565 struct sierra_net_data *priv = sierra_net_get_private(dev);
566
567 set_bit(work, &priv->kevent_flags);
568 schedule_work(&priv->sierra_net_kevent);
569}
570
571/*
572 * Sync Retransmit Timer Handler. On expiry, kick the work queue
573 */
574static void sierra_sync_timer(struct timer_list *t)
575{
576 struct sierra_net_data *priv = from_timer(priv, t, sync_timer);
577 struct usbnet *dev = priv->usbnet;
578
579 dev_dbg(&dev->udev->dev, "%s", __func__);
580 /* Kick the tasklet */
581 sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
582}
583
584static void sierra_net_status(struct usbnet *dev, struct urb *urb)
585{
586 struct usb_cdc_notification *event;
587
588 dev_dbg(&dev->udev->dev, "%s", __func__);
589
590 if (urb->actual_length < sizeof *event)
591 return;
592
593 /* Add cases to handle other standard notifications. */
594 event = urb->transfer_buffer;
595 switch (event->bNotificationType) {
596 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
597 case USB_CDC_NOTIFY_SPEED_CHANGE:
598 /* USB 305 sends those */
599 break;
600 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
601 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
602 break;
603 default:
604 netdev_err(dev->net, ": unexpected notification %02x!\n",
605 event->bNotificationType);
606 break;
607 }
608}
609
610static void sierra_net_get_drvinfo(struct net_device *net,
611 struct ethtool_drvinfo *info)
612{
613 /* Inherit standard device info */
614 usbnet_get_drvinfo(net, info);
615 strscpy(info->driver, driver_name, sizeof(info->driver));
616 strscpy(info->version, DRIVER_VERSION, sizeof(info->version));
617}
618
619static u32 sierra_net_get_link(struct net_device *net)
620{
621 struct usbnet *dev = netdev_priv(net);
622 /* Report link is down whenever the interface is down */
623 return sierra_net_get_private(dev)->link_up && netif_running(net);
624}
625
626static const struct ethtool_ops sierra_net_ethtool_ops = {
627 .get_drvinfo = sierra_net_get_drvinfo,
628 .get_link = sierra_net_get_link,
629 .get_msglevel = usbnet_get_msglevel,
630 .set_msglevel = usbnet_set_msglevel,
631 .nway_reset = usbnet_nway_reset,
632 .get_link_ksettings = usbnet_get_link_ksettings_mii,
633 .set_link_ksettings = usbnet_set_link_ksettings_mii,
634};
635
636static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
637{
638 int result = 0;
639 __le16 attrdata;
640
641 result = usbnet_read_cmd(dev,
642 /* _u8 vendor specific request */
643 SWI_USB_REQUEST_GET_FW_ATTR,
644 USB_DIR_IN | USB_TYPE_VENDOR, /* __u8 request type */
645 0x0000, /* __u16 value not used */
646 0x0000, /* __u16 index not used */
647 &attrdata, /* char *data */
648 sizeof(attrdata) /* __u16 size */
649 );
650
651 if (result < 0)
652 return -EIO;
653
654 *datap = le16_to_cpu(attrdata);
655 return result;
656}
657
658/*
659 * collects the bulk endpoints, the status endpoint.
660 */
661static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
662{
663 u8 ifacenum;
664 u8 numendpoints;
665 u16 fwattr = 0;
666 int status;
667 struct sierra_net_data *priv;
668 static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
669 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
670 static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
671 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
672 u8 mod[2];
673
674 dev_dbg(&dev->udev->dev, "%s", __func__);
675
676 ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
677 numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
678 /* We have three endpoints, bulk in and out, and a status */
679 if (numendpoints != 3) {
680 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
681 numendpoints);
682 return -ENODEV;
683 }
684 /* Status endpoint set in usbnet_get_endpoints() */
685 dev->status = NULL;
686 status = usbnet_get_endpoints(dev, intf);
687 if (status < 0) {
688 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
689 status);
690 return -ENODEV;
691 }
692 /* Initialize sierra private data */
693 priv = kzalloc(sizeof *priv, GFP_KERNEL);
694 if (!priv)
695 return -ENOMEM;
696
697 priv->usbnet = dev;
698 priv->ifnum = ifacenum;
699 dev->net->netdev_ops = &sierra_net_device_ops;
700
701 /* change MAC addr to include, ifacenum, and to be unique */
702 mod[0] = atomic_inc_return(&iface_counter);
703 mod[1] = ifacenum;
704 dev_addr_mod(dev->net, ETH_ALEN - 2, mod, 2);
705
706 /* prepare shutdown message template */
707 memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
708 /* set context index initially to 0 - prepares tx hdr template */
709 sierra_net_set_ctx_index(priv, 0);
710
711 /* prepare sync message template */
712 memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
713
714 /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
715 dev->rx_urb_size = SIERRA_NET_RX_URB_SIZE;
716 if (dev->udev->speed != USB_SPEED_HIGH)
717 dev->rx_urb_size = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
718
719 dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
720 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
721 dev->net->max_mtu = SIERRA_NET_MAX_SUPPORTED_MTU;
722
723 /* Set up the netdev */
724 dev->net->flags |= IFF_NOARP;
725 dev->net->ethtool_ops = &sierra_net_ethtool_ops;
726 netif_carrier_off(dev->net);
727
728 sierra_net_set_private(dev, priv);
729
730 priv->kevent_flags = 0;
731
732 /* Use the shared workqueue */
733 INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
734
735 /* Only need to do this once */
736 timer_setup(&priv->sync_timer, sierra_sync_timer, 0);
737
738 /* verify fw attributes */
739 status = sierra_net_get_fw_attr(dev, &fwattr);
740 dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
741
742 /* test whether firmware supports DHCP */
743 if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
744 /* found incompatible firmware version */
745 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
746 " versions\n");
747 kfree(priv);
748 return -ENODEV;
749 }
750
751 return 0;
752}
753
754static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
755{
756 int status;
757 struct sierra_net_data *priv = sierra_net_get_private(dev);
758
759 dev_dbg(&dev->udev->dev, "%s", __func__);
760
761 /* kill the timer and work */
762 timer_shutdown_sync(&priv->sync_timer);
763 cancel_work_sync(&priv->sierra_net_kevent);
764
765 /* tell modem we are going away */
766 status = sierra_net_send_cmd(dev, priv->shdwn_msg,
767 sizeof(priv->shdwn_msg), "Shutdown");
768 if (status < 0)
769 netdev_err(dev->net,
770 "usb_control_msg failed, status %d\n", status);
771
772 usbnet_status_stop(dev);
773
774 sierra_net_set_private(dev, NULL);
775 kfree(priv);
776}
777
778static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
779 struct sk_buff *skb, int len)
780{
781 struct sk_buff *new_skb;
782
783 /* clone skb */
784 new_skb = skb_clone(skb, GFP_ATOMIC);
785
786 /* remove len bytes from original */
787 skb_pull(skb, len);
788
789 /* trim next packet to it's length */
790 if (new_skb) {
791 skb_trim(new_skb, len);
792 } else {
793 if (netif_msg_rx_err(dev))
794 netdev_err(dev->net, "failed to get skb\n");
795 dev->net->stats.rx_dropped++;
796 }
797
798 return new_skb;
799}
800
801/* ---------------------------- Receive data path ----------------------*/
802static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
803{
804 int err;
805 struct hip_hdr hh;
806 struct sk_buff *new_skb;
807
808 dev_dbg(&dev->udev->dev, "%s", __func__);
809
810 /* could contain multiple packets */
811 while (likely(skb->len)) {
812 err = parse_hip(skb->data, skb->len, &hh);
813 if (err) {
814 if (netif_msg_rx_err(dev))
815 netdev_err(dev->net, "Invalid HIP header %d\n",
816 err);
817 /* dev->net->stats.rx_errors incremented by caller */
818 dev->net->stats.rx_length_errors++;
819 return 0;
820 }
821
822 /* Validate Extended HIP header */
823 if (!hh.extmsgid.is_present
824 || hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
825 if (netif_msg_rx_err(dev))
826 netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
827
828 dev->net->stats.rx_frame_errors++;
829 /* dev->net->stats.rx_errors incremented by caller */
830 return 0;
831 }
832
833 skb_pull(skb, hh.hdrlen);
834
835 /* We are going to accept this packet, prepare it.
836 * In case protocol is IPv6, keep it, otherwise force IPv4.
837 */
838 skb_reset_mac_header(skb);
839 if (eth_hdr(skb)->h_proto != cpu_to_be16(ETH_P_IPV6))
840 eth_hdr(skb)->h_proto = cpu_to_be16(ETH_P_IP);
841 eth_zero_addr(eth_hdr(skb)->h_source);
842 memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
843
844 /* Last packet in batch handled by usbnet */
845 if (hh.payload_len.word == skb->len)
846 return 1;
847
848 new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
849 if (new_skb)
850 usbnet_skb_return(dev, new_skb);
851
852 } /* while */
853
854 return 0;
855}
856
857/* ---------------------------- Transmit data path ----------------------*/
858static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev,
859 struct sk_buff *skb, gfp_t flags)
860{
861 struct sierra_net_data *priv = sierra_net_get_private(dev);
862 u16 len;
863 bool need_tail;
864
865 BUILD_BUG_ON(sizeof_field(struct usbnet, data)
866 < sizeof(struct cdc_state));
867
868 dev_dbg(&dev->udev->dev, "%s", __func__);
869 if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
870 /* enough head room as is? */
871 if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
872 /* Save the Eth/IP length and set up HIP hdr */
873 len = skb->len;
874 skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
875 /* Handle ZLP issue */
876 need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
877 % dev->maxpacket == 0);
878 if (need_tail) {
879 if (unlikely(skb_tailroom(skb) == 0)) {
880 netdev_err(dev->net, "tx_fixup:"
881 "no room for packet\n");
882 dev_kfree_skb_any(skb);
883 return NULL;
884 } else {
885 skb->data[skb->len] = 0;
886 __skb_put(skb, 1);
887 len = len + 1;
888 }
889 }
890 build_hip(skb->data, len, priv);
891 return skb;
892 } else {
893 /*
894 * compensate in the future if necessary
895 */
896 netdev_err(dev->net, "tx_fixup: no room for HIP\n");
897 } /* headroom */
898 }
899
900 if (!priv->link_up)
901 dev->net->stats.tx_carrier_errors++;
902
903 /* tx_dropped incremented by usbnet */
904
905 /* filter the packet out, release it */
906 dev_kfree_skb_any(skb);
907 return NULL;
908}
909
910static const struct driver_info sierra_net_info_direct_ip = {
911 .description = "Sierra Wireless USB-to-WWAN Modem",
912 .flags = FLAG_WWAN | FLAG_SEND_ZLP,
913 .bind = sierra_net_bind,
914 .unbind = sierra_net_unbind,
915 .status = sierra_net_status,
916 .rx_fixup = sierra_net_rx_fixup,
917 .tx_fixup = sierra_net_tx_fixup,
918};
919
920static int
921sierra_net_probe(struct usb_interface *udev, const struct usb_device_id *prod)
922{
923 int ret;
924
925 ret = usbnet_probe(udev, prod);
926 if (ret == 0) {
927 struct usbnet *dev = usb_get_intfdata(udev);
928
929 ret = usbnet_status_start(dev, GFP_KERNEL);
930 if (ret == 0) {
931 /* Interrupt URB now set up; initiate sync sequence */
932 sierra_net_dosync(dev);
933 }
934 }
935 return ret;
936}
937
938#define DIRECT_IP_DEVICE(vend, prod) \
939 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
940 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
941 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
942 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
943 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
944 .driver_info = (unsigned long)&sierra_net_info_direct_ip}
945
946static const struct usb_device_id products[] = {
947 DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
948 DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
949 DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
950 DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
951
952 {}, /* last item */
953};
954MODULE_DEVICE_TABLE(usb, products);
955
956/* We are based on usbnet, so let it handle the USB driver specifics */
957static struct usb_driver sierra_net_driver = {
958 .name = "sierra_net",
959 .id_table = products,
960 .probe = sierra_net_probe,
961 .disconnect = usbnet_disconnect,
962 .suspend = usbnet_suspend,
963 .resume = usbnet_resume,
964 .no_dynamic_id = 1,
965 .disable_hub_initiated_lpm = 1,
966};
967
968module_usb_driver(sierra_net_driver);
969
970MODULE_AUTHOR(DRIVER_AUTHOR);
971MODULE_DESCRIPTION(DRIVER_DESC);
972MODULE_VERSION(DRIVER_VERSION);
973MODULE_LICENSE("GPL");
1/*
2 * USB-to-WWAN Driver for Sierra Wireless modems
3 *
4 * Copyright (C) 2008, 2009, 2010 Paxton Smith, Matthew Safar, Rory Filer
5 * <linux@sierrawireless.com>
6 *
7 * Portions of this based on the cdc_ether driver by David Brownell (2003-2005)
8 * and Ole Andre Vadla Ravnas (ActiveSync) (2006).
9 *
10 * IMPORTANT DISCLAIMER: This driver is not commercially supported by
11 * Sierra Wireless. Use at your own risk.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see <http://www.gnu.org/licenses/>.
25 */
26
27#define DRIVER_VERSION "v.2.0"
28#define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
29#define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
30static const char driver_name[] = "sierra_net";
31
32/* if defined debug messages enabled */
33/*#define DEBUG*/
34
35#include <linux/module.h>
36#include <linux/etherdevice.h>
37#include <linux/ethtool.h>
38#include <linux/mii.h>
39#include <linux/sched.h>
40#include <linux/timer.h>
41#include <linux/usb.h>
42#include <linux/usb/cdc.h>
43#include <net/ip.h>
44#include <net/udp.h>
45#include <asm/unaligned.h>
46#include <linux/usb/usbnet.h>
47
48#define SWI_USB_REQUEST_GET_FW_ATTR 0x06
49#define SWI_GET_FW_ATTR_MASK 0x08
50
51/* atomic counter partially included in MAC address to make sure 2 devices
52 * do not end up with the same MAC - concept breaks in case of > 255 ifaces
53 */
54static atomic_t iface_counter = ATOMIC_INIT(0);
55
56/*
57 * SYNC Timer Delay definition used to set the expiry time
58 */
59#define SIERRA_NET_SYNCDELAY (2*HZ)
60
61/* Max. MTU supported. The modem buffers are limited to 1500 */
62#define SIERRA_NET_MAX_SUPPORTED_MTU 1500
63
64/* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
65 * message reception ... and thus the max. received packet.
66 * (May be the cause for parse_hip returning -EINVAL)
67 */
68#define SIERRA_NET_USBCTL_BUF_LEN 1024
69
70/* Overriding the default usbnet rx_urb_size */
71#define SIERRA_NET_RX_URB_SIZE (8 * 1024)
72
73/* Private data structure */
74struct sierra_net_data {
75
76 u16 link_up; /* air link up or down */
77 u8 tx_hdr_template[4]; /* part of HIP hdr for tx'd packets */
78
79 u8 sync_msg[4]; /* SYNC message */
80 u8 shdwn_msg[4]; /* Shutdown message */
81
82 /* Backpointer to the container */
83 struct usbnet *usbnet;
84
85 u8 ifnum; /* interface number */
86
87/* Bit masks, must be a power of 2 */
88#define SIERRA_NET_EVENT_RESP_AVAIL 0x01
89#define SIERRA_NET_TIMER_EXPIRY 0x02
90 unsigned long kevent_flags;
91 struct work_struct sierra_net_kevent;
92 struct timer_list sync_timer; /* For retrying SYNC sequence */
93};
94
95struct param {
96 int is_present;
97 union {
98 void *ptr;
99 u32 dword;
100 u16 word;
101 u8 byte;
102 };
103};
104
105/* HIP message type */
106#define SIERRA_NET_HIP_EXTENDEDID 0x7F
107#define SIERRA_NET_HIP_HSYNC_ID 0x60 /* Modem -> host */
108#define SIERRA_NET_HIP_RESTART_ID 0x62 /* Modem -> host */
109#define SIERRA_NET_HIP_MSYNC_ID 0x20 /* Host -> modem */
110#define SIERRA_NET_HIP_SHUTD_ID 0x26 /* Host -> modem */
111
112#define SIERRA_NET_HIP_EXT_IP_IN_ID 0x0202
113#define SIERRA_NET_HIP_EXT_IP_OUT_ID 0x0002
114
115/* 3G UMTS Link Sense Indication definitions */
116#define SIERRA_NET_HIP_LSI_UMTSID 0x78
117
118/* Reverse Channel Grant Indication HIP message */
119#define SIERRA_NET_HIP_RCGI 0x64
120
121/* LSI Protocol types */
122#define SIERRA_NET_PROTOCOL_UMTS 0x01
123#define SIERRA_NET_PROTOCOL_UMTS_DS 0x04
124/* LSI Coverage */
125#define SIERRA_NET_COVERAGE_NONE 0x00
126#define SIERRA_NET_COVERAGE_NOPACKET 0x01
127
128/* LSI Session */
129#define SIERRA_NET_SESSION_IDLE 0x00
130/* LSI Link types */
131#define SIERRA_NET_AS_LINK_TYPE_IPV4 0x00
132#define SIERRA_NET_AS_LINK_TYPE_IPV6 0x02
133
134struct lsi_umts {
135 u8 protocol;
136 u8 unused1;
137 __be16 length;
138 /* eventually use a union for the rest - assume umts for now */
139 u8 coverage;
140 u8 network_len; /* network name len */
141 u8 network[40]; /* network name (UCS2, bigendian) */
142 u8 session_state;
143 u8 unused3[33];
144} __packed;
145
146struct lsi_umts_single {
147 struct lsi_umts lsi;
148 u8 link_type;
149 u8 pdp_addr_len; /* NW-supplied PDP address len */
150 u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
151 u8 unused4[23];
152 u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
153 u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
154 u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
155 u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
156 u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
157 u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
158 u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
159 u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
160 u8 unused5[4];
161 u8 gw_addr_len; /* NW-supplied GW address len */
162 u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
163 u8 reserved[8];
164} __packed;
165
166struct lsi_umts_dual {
167 struct lsi_umts lsi;
168 u8 pdp_addr4_len; /* NW-supplied PDP IPv4 address len */
169 u8 pdp_addr4[4]; /* NW-supplied PDP IPv4 address (bigendian)) */
170 u8 pdp_addr6_len; /* NW-supplied PDP IPv6 address len */
171 u8 pdp_addr6[16]; /* NW-supplied PDP IPv6 address (bigendian)) */
172 u8 unused4[23];
173 u8 dns1_addr4_len; /* NW-supplied 1st DNS v4 address len (bigendian) */
174 u8 dns1_addr4[4]; /* NW-supplied 1st DNS v4 address */
175 u8 dns1_addr6_len; /* NW-supplied 1st DNS v6 address len */
176 u8 dns1_addr6[16]; /* NW-supplied 1st DNS v6 address (bigendian)*/
177 u8 dns2_addr4_len; /* NW-supplied 2nd DNS v4 address len (bigendian) */
178 u8 dns2_addr4[4]; /* NW-supplied 2nd DNS v4 address */
179 u8 dns2_addr6_len; /* NW-supplied 2nd DNS v6 address len */
180 u8 dns2_addr6[16]; /* NW-supplied 2nd DNS v6 address (bigendian)*/
181 u8 unused5[68];
182} __packed;
183
184#define SIERRA_NET_LSI_COMMON_LEN 4
185#define SIERRA_NET_LSI_UMTS_LEN (sizeof(struct lsi_umts_single))
186#define SIERRA_NET_LSI_UMTS_STATUS_LEN \
187 (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
188#define SIERRA_NET_LSI_UMTS_DS_LEN (sizeof(struct lsi_umts_dual))
189#define SIERRA_NET_LSI_UMTS_DS_STATUS_LEN \
190 (SIERRA_NET_LSI_UMTS_DS_LEN - SIERRA_NET_LSI_COMMON_LEN)
191
192/* Our own net device operations structure */
193static const struct net_device_ops sierra_net_device_ops = {
194 .ndo_open = usbnet_open,
195 .ndo_stop = usbnet_stop,
196 .ndo_start_xmit = usbnet_start_xmit,
197 .ndo_tx_timeout = usbnet_tx_timeout,
198 .ndo_change_mtu = usbnet_change_mtu,
199 .ndo_get_stats64 = usbnet_get_stats64,
200 .ndo_set_mac_address = eth_mac_addr,
201 .ndo_validate_addr = eth_validate_addr,
202};
203
204/* get private data associated with passed in usbnet device */
205static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
206{
207 return (struct sierra_net_data *)dev->data[0];
208}
209
210/* set private data associated with passed in usbnet device */
211static inline void sierra_net_set_private(struct usbnet *dev,
212 struct sierra_net_data *priv)
213{
214 dev->data[0] = (unsigned long)priv;
215}
216
217/* is packet IPv4/IPv6 */
218static inline int is_ip(struct sk_buff *skb)
219{
220 return skb->protocol == cpu_to_be16(ETH_P_IP) ||
221 skb->protocol == cpu_to_be16(ETH_P_IPV6);
222}
223
224/*
225 * check passed in packet and make sure that:
226 * - it is linear (no scatter/gather)
227 * - it is ethernet (mac_header properly set)
228 */
229static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
230{
231 skb_reset_mac_header(skb); /* ethernet header */
232
233 if (skb_is_nonlinear(skb)) {
234 netdev_err(dev->net, "Non linear buffer-dropping\n");
235 return 0;
236 }
237
238 if (!pskb_may_pull(skb, ETH_HLEN))
239 return 0;
240 skb->protocol = eth_hdr(skb)->h_proto;
241
242 return 1;
243}
244
245static const u8 *save16bit(struct param *p, const u8 *datap)
246{
247 p->is_present = 1;
248 p->word = get_unaligned_be16(datap);
249 return datap + sizeof(p->word);
250}
251
252static const u8 *save8bit(struct param *p, const u8 *datap)
253{
254 p->is_present = 1;
255 p->byte = *datap;
256 return datap + sizeof(p->byte);
257}
258
259/*----------------------------------------------------------------------------*
260 * BEGIN HIP *
261 *----------------------------------------------------------------------------*/
262/* HIP header */
263#define SIERRA_NET_HIP_HDR_LEN 4
264/* Extended HIP header */
265#define SIERRA_NET_HIP_EXT_HDR_LEN 6
266
267struct hip_hdr {
268 int hdrlen;
269 struct param payload_len;
270 struct param msgid;
271 struct param msgspecific;
272 struct param extmsgid;
273};
274
275static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
276{
277 const u8 *curp = buf;
278 int padded;
279
280 if (buflen < SIERRA_NET_HIP_HDR_LEN)
281 return -EPROTO;
282
283 curp = save16bit(&hh->payload_len, curp);
284 curp = save8bit(&hh->msgid, curp);
285 curp = save8bit(&hh->msgspecific, curp);
286
287 padded = hh->msgid.byte & 0x80;
288 hh->msgid.byte &= 0x7F; /* 7 bits */
289
290 hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
291 if (hh->extmsgid.is_present) {
292 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
293 return -EPROTO;
294
295 hh->payload_len.word &= 0x3FFF; /* 14 bits */
296
297 curp = save16bit(&hh->extmsgid, curp);
298 hh->extmsgid.word &= 0x03FF; /* 10 bits */
299
300 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
301 } else {
302 hh->payload_len.word &= 0x07FF; /* 11 bits */
303 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
304 }
305
306 if (padded) {
307 hh->hdrlen++;
308 hh->payload_len.word--;
309 }
310
311 /* if real packet shorter than the claimed length */
312 if (buflen < (hh->hdrlen + hh->payload_len.word))
313 return -EINVAL;
314
315 return 0;
316}
317
318static void build_hip(u8 *buf, const u16 payloadlen,
319 struct sierra_net_data *priv)
320{
321 /* the following doesn't have the full functionality. We
322 * currently build only one kind of header, so it is faster this way
323 */
324 put_unaligned_be16(payloadlen, buf);
325 memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
326}
327/*----------------------------------------------------------------------------*
328 * END HIP *
329 *----------------------------------------------------------------------------*/
330
331static int sierra_net_send_cmd(struct usbnet *dev,
332 u8 *cmd, int cmdlen, const char * cmd_name)
333{
334 struct sierra_net_data *priv = sierra_net_get_private(dev);
335 int status;
336
337 status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
338 USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
339 0, priv->ifnum, cmd, cmdlen);
340
341 if (status != cmdlen && status != -ENODEV)
342 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
343
344 return status;
345}
346
347static int sierra_net_send_sync(struct usbnet *dev)
348{
349 int status;
350 struct sierra_net_data *priv = sierra_net_get_private(dev);
351
352 dev_dbg(&dev->udev->dev, "%s", __func__);
353
354 status = sierra_net_send_cmd(dev, priv->sync_msg,
355 sizeof(priv->sync_msg), "SYNC");
356
357 return status;
358}
359
360static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
361{
362 dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
363 priv->tx_hdr_template[0] = 0x3F;
364 priv->tx_hdr_template[1] = ctx_ix;
365 *((__be16 *)&priv->tx_hdr_template[2]) =
366 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
367}
368
369static inline int sierra_net_is_valid_addrlen(u8 len)
370{
371 return len == sizeof(struct in_addr);
372}
373
374static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
375{
376 struct lsi_umts *lsi = (struct lsi_umts *)data;
377 u32 expected_length;
378
379 if (datalen < sizeof(struct lsi_umts_single)) {
380 netdev_err(dev->net, "%s: Data length %d, exp >= %zu\n",
381 __func__, datalen, sizeof(struct lsi_umts_single));
382 return -1;
383 }
384
385 /* Validate the session state */
386 if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
387 netdev_err(dev->net, "Session idle, 0x%02x\n",
388 lsi->session_state);
389 return 0;
390 }
391
392 /* Validate the protocol - only support UMTS for now */
393 if (lsi->protocol == SIERRA_NET_PROTOCOL_UMTS) {
394 struct lsi_umts_single *single = (struct lsi_umts_single *)lsi;
395
396 /* Validate the link type */
397 if (single->link_type != SIERRA_NET_AS_LINK_TYPE_IPV4 &&
398 single->link_type != SIERRA_NET_AS_LINK_TYPE_IPV6) {
399 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
400 single->link_type);
401 return -1;
402 }
403 expected_length = SIERRA_NET_LSI_UMTS_STATUS_LEN;
404 } else if (lsi->protocol == SIERRA_NET_PROTOCOL_UMTS_DS) {
405 expected_length = SIERRA_NET_LSI_UMTS_DS_STATUS_LEN;
406 } else {
407 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
408 lsi->protocol);
409 return -1;
410 }
411
412 if (be16_to_cpu(lsi->length) != expected_length) {
413 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
414 __func__, be16_to_cpu(lsi->length), expected_length);
415 return -1;
416 }
417
418 /* Validate the coverage */
419 if (lsi->coverage == SIERRA_NET_COVERAGE_NONE ||
420 lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
421 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
422 return 0;
423 }
424
425 /* Set link_sense true */
426 return 1;
427}
428
429static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
430 struct hip_hdr *hh)
431{
432 struct sierra_net_data *priv = sierra_net_get_private(dev);
433 int link_up;
434
435 link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
436 hh->payload_len.word);
437 if (link_up < 0) {
438 netdev_err(dev->net, "Invalid LSI\n");
439 return;
440 }
441 if (link_up) {
442 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
443 priv->link_up = 1;
444 } else {
445 priv->link_up = 0;
446 }
447 usbnet_link_change(dev, link_up, 0);
448}
449
450static void sierra_net_dosync(struct usbnet *dev)
451{
452 int status;
453 struct sierra_net_data *priv = sierra_net_get_private(dev);
454
455 dev_dbg(&dev->udev->dev, "%s", __func__);
456
457 /* The SIERRA_NET_HIP_MSYNC_ID command appears to request that the
458 * firmware restart itself. After restarting, the modem will respond
459 * with the SIERRA_NET_HIP_RESTART_ID indication. The driver continues
460 * sending MSYNC commands every few seconds until it receives the
461 * RESTART event from the firmware
462 */
463
464 /* tell modem we are ready */
465 status = sierra_net_send_sync(dev);
466 if (status < 0)
467 netdev_err(dev->net,
468 "Send SYNC failed, status %d\n", status);
469 status = sierra_net_send_sync(dev);
470 if (status < 0)
471 netdev_err(dev->net,
472 "Send SYNC failed, status %d\n", status);
473
474 /* Now, start a timer and make sure we get the Restart Indication */
475 priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
476 add_timer(&priv->sync_timer);
477}
478
479static void sierra_net_kevent(struct work_struct *work)
480{
481 struct sierra_net_data *priv =
482 container_of(work, struct sierra_net_data, sierra_net_kevent);
483 struct usbnet *dev = priv->usbnet;
484 int len;
485 int err;
486 u8 *buf;
487 u8 ifnum;
488
489 if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
490 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
491
492 /* Query the modem for the LSI message */
493 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
494 if (!buf)
495 return;
496
497 ifnum = priv->ifnum;
498 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
499 USB_CDC_GET_ENCAPSULATED_RESPONSE,
500 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
501 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
502 USB_CTRL_SET_TIMEOUT);
503
504 if (len < 0) {
505 netdev_err(dev->net,
506 "usb_control_msg failed, status %d\n", len);
507 } else {
508 struct hip_hdr hh;
509
510 dev_dbg(&dev->udev->dev, "%s: Received status message,"
511 " %04x bytes", __func__, len);
512
513 err = parse_hip(buf, len, &hh);
514 if (err) {
515 netdev_err(dev->net, "%s: Bad packet,"
516 " parse result %d\n", __func__, err);
517 kfree(buf);
518 return;
519 }
520
521 /* Validate packet length */
522 if (len != hh.hdrlen + hh.payload_len.word) {
523 netdev_err(dev->net, "%s: Bad packet, received"
524 " %d, expected %d\n", __func__, len,
525 hh.hdrlen + hh.payload_len.word);
526 kfree(buf);
527 return;
528 }
529
530 /* Switch on received message types */
531 switch (hh.msgid.byte) {
532 case SIERRA_NET_HIP_LSI_UMTSID:
533 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
534 hh.msgspecific.byte);
535 sierra_net_handle_lsi(dev, buf, &hh);
536 break;
537 case SIERRA_NET_HIP_RESTART_ID:
538 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
539 " stopping sync timer",
540 hh.msgspecific.byte);
541 /* Got sync resp - stop timer & clear mask */
542 del_timer_sync(&priv->sync_timer);
543 clear_bit(SIERRA_NET_TIMER_EXPIRY,
544 &priv->kevent_flags);
545 break;
546 case SIERRA_NET_HIP_HSYNC_ID:
547 dev_dbg(&dev->udev->dev, "SYNC received");
548 err = sierra_net_send_sync(dev);
549 if (err < 0)
550 netdev_err(dev->net,
551 "Send SYNC failed %d\n", err);
552 break;
553 case SIERRA_NET_HIP_EXTENDEDID:
554 netdev_err(dev->net, "Unrecognized HIP msg, "
555 "extmsgid 0x%04x\n", hh.extmsgid.word);
556 break;
557 case SIERRA_NET_HIP_RCGI:
558 /* Ignored */
559 break;
560 default:
561 netdev_err(dev->net, "Unrecognized HIP msg, "
562 "msgid 0x%02x\n", hh.msgid.byte);
563 break;
564 }
565 }
566 kfree(buf);
567 }
568 /* The sync timer bit might be set */
569 if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
570 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
571 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
572 sierra_net_dosync(priv->usbnet);
573 }
574
575 if (priv->kevent_flags)
576 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
577 "kevent_flags = 0x%lx", priv->kevent_flags);
578}
579
580static void sierra_net_defer_kevent(struct usbnet *dev, int work)
581{
582 struct sierra_net_data *priv = sierra_net_get_private(dev);
583
584 set_bit(work, &priv->kevent_flags);
585 schedule_work(&priv->sierra_net_kevent);
586}
587
588/*
589 * Sync Retransmit Timer Handler. On expiry, kick the work queue
590 */
591static void sierra_sync_timer(struct timer_list *t)
592{
593 struct sierra_net_data *priv = from_timer(priv, t, sync_timer);
594 struct usbnet *dev = priv->usbnet;
595
596 dev_dbg(&dev->udev->dev, "%s", __func__);
597 /* Kick the tasklet */
598 sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
599}
600
601static void sierra_net_status(struct usbnet *dev, struct urb *urb)
602{
603 struct usb_cdc_notification *event;
604
605 dev_dbg(&dev->udev->dev, "%s", __func__);
606
607 if (urb->actual_length < sizeof *event)
608 return;
609
610 /* Add cases to handle other standard notifications. */
611 event = urb->transfer_buffer;
612 switch (event->bNotificationType) {
613 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
614 case USB_CDC_NOTIFY_SPEED_CHANGE:
615 /* USB 305 sends those */
616 break;
617 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
618 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
619 break;
620 default:
621 netdev_err(dev->net, ": unexpected notification %02x!\n",
622 event->bNotificationType);
623 break;
624 }
625}
626
627static void sierra_net_get_drvinfo(struct net_device *net,
628 struct ethtool_drvinfo *info)
629{
630 /* Inherit standard device info */
631 usbnet_get_drvinfo(net, info);
632 strlcpy(info->driver, driver_name, sizeof(info->driver));
633 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
634}
635
636static u32 sierra_net_get_link(struct net_device *net)
637{
638 struct usbnet *dev = netdev_priv(net);
639 /* Report link is down whenever the interface is down */
640 return sierra_net_get_private(dev)->link_up && netif_running(net);
641}
642
643static const struct ethtool_ops sierra_net_ethtool_ops = {
644 .get_drvinfo = sierra_net_get_drvinfo,
645 .get_link = sierra_net_get_link,
646 .get_msglevel = usbnet_get_msglevel,
647 .set_msglevel = usbnet_set_msglevel,
648 .nway_reset = usbnet_nway_reset,
649 .get_link_ksettings = usbnet_get_link_ksettings,
650 .set_link_ksettings = usbnet_set_link_ksettings,
651};
652
653static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
654{
655 int result = 0;
656 __le16 attrdata;
657
658 result = usbnet_read_cmd(dev,
659 /* _u8 vendor specific request */
660 SWI_USB_REQUEST_GET_FW_ATTR,
661 USB_DIR_IN | USB_TYPE_VENDOR, /* __u8 request type */
662 0x0000, /* __u16 value not used */
663 0x0000, /* __u16 index not used */
664 &attrdata, /* char *data */
665 sizeof(attrdata) /* __u16 size */
666 );
667
668 if (result < 0)
669 return -EIO;
670
671 *datap = le16_to_cpu(attrdata);
672 return result;
673}
674
675/*
676 * collects the bulk endpoints, the status endpoint.
677 */
678static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
679{
680 u8 ifacenum;
681 u8 numendpoints;
682 u16 fwattr = 0;
683 int status;
684 struct sierra_net_data *priv;
685 static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
686 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
687 static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
688 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
689
690 dev_dbg(&dev->udev->dev, "%s", __func__);
691
692 ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
693 numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
694 /* We have three endpoints, bulk in and out, and a status */
695 if (numendpoints != 3) {
696 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
697 numendpoints);
698 return -ENODEV;
699 }
700 /* Status endpoint set in usbnet_get_endpoints() */
701 dev->status = NULL;
702 status = usbnet_get_endpoints(dev, intf);
703 if (status < 0) {
704 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
705 status);
706 return -ENODEV;
707 }
708 /* Initialize sierra private data */
709 priv = kzalloc(sizeof *priv, GFP_KERNEL);
710 if (!priv)
711 return -ENOMEM;
712
713 priv->usbnet = dev;
714 priv->ifnum = ifacenum;
715 dev->net->netdev_ops = &sierra_net_device_ops;
716
717 /* change MAC addr to include, ifacenum, and to be unique */
718 dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
719 dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
720
721 /* prepare shutdown message template */
722 memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
723 /* set context index initially to 0 - prepares tx hdr template */
724 sierra_net_set_ctx_index(priv, 0);
725
726 /* prepare sync message template */
727 memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
728
729 /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
730 dev->rx_urb_size = SIERRA_NET_RX_URB_SIZE;
731 if (dev->udev->speed != USB_SPEED_HIGH)
732 dev->rx_urb_size = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
733
734 dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
735 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
736 dev->net->max_mtu = SIERRA_NET_MAX_SUPPORTED_MTU;
737
738 /* Set up the netdev */
739 dev->net->flags |= IFF_NOARP;
740 dev->net->ethtool_ops = &sierra_net_ethtool_ops;
741 netif_carrier_off(dev->net);
742
743 sierra_net_set_private(dev, priv);
744
745 priv->kevent_flags = 0;
746
747 /* Use the shared workqueue */
748 INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
749
750 /* Only need to do this once */
751 timer_setup(&priv->sync_timer, sierra_sync_timer, 0);
752
753 /* verify fw attributes */
754 status = sierra_net_get_fw_attr(dev, &fwattr);
755 dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
756
757 /* test whether firmware supports DHCP */
758 if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
759 /* found incompatible firmware version */
760 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
761 " versions\n");
762 kfree(priv);
763 return -ENODEV;
764 }
765
766 return 0;
767}
768
769static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
770{
771 int status;
772 struct sierra_net_data *priv = sierra_net_get_private(dev);
773
774 dev_dbg(&dev->udev->dev, "%s", __func__);
775
776 /* kill the timer and work */
777 del_timer_sync(&priv->sync_timer);
778 cancel_work_sync(&priv->sierra_net_kevent);
779
780 /* tell modem we are going away */
781 status = sierra_net_send_cmd(dev, priv->shdwn_msg,
782 sizeof(priv->shdwn_msg), "Shutdown");
783 if (status < 0)
784 netdev_err(dev->net,
785 "usb_control_msg failed, status %d\n", status);
786
787 usbnet_status_stop(dev);
788
789 sierra_net_set_private(dev, NULL);
790 kfree(priv);
791}
792
793static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
794 struct sk_buff *skb, int len)
795{
796 struct sk_buff *new_skb;
797
798 /* clone skb */
799 new_skb = skb_clone(skb, GFP_ATOMIC);
800
801 /* remove len bytes from original */
802 skb_pull(skb, len);
803
804 /* trim next packet to it's length */
805 if (new_skb) {
806 skb_trim(new_skb, len);
807 } else {
808 if (netif_msg_rx_err(dev))
809 netdev_err(dev->net, "failed to get skb\n");
810 dev->net->stats.rx_dropped++;
811 }
812
813 return new_skb;
814}
815
816/* ---------------------------- Receive data path ----------------------*/
817static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
818{
819 int err;
820 struct hip_hdr hh;
821 struct sk_buff *new_skb;
822
823 dev_dbg(&dev->udev->dev, "%s", __func__);
824
825 /* could contain multiple packets */
826 while (likely(skb->len)) {
827 err = parse_hip(skb->data, skb->len, &hh);
828 if (err) {
829 if (netif_msg_rx_err(dev))
830 netdev_err(dev->net, "Invalid HIP header %d\n",
831 err);
832 /* dev->net->stats.rx_errors incremented by caller */
833 dev->net->stats.rx_length_errors++;
834 return 0;
835 }
836
837 /* Validate Extended HIP header */
838 if (!hh.extmsgid.is_present
839 || hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
840 if (netif_msg_rx_err(dev))
841 netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
842
843 dev->net->stats.rx_frame_errors++;
844 /* dev->net->stats.rx_errors incremented by caller */
845 return 0;
846 }
847
848 skb_pull(skb, hh.hdrlen);
849
850 /* We are going to accept this packet, prepare it.
851 * In case protocol is IPv6, keep it, otherwise force IPv4.
852 */
853 skb_reset_mac_header(skb);
854 if (eth_hdr(skb)->h_proto != cpu_to_be16(ETH_P_IPV6))
855 eth_hdr(skb)->h_proto = cpu_to_be16(ETH_P_IP);
856 eth_zero_addr(eth_hdr(skb)->h_source);
857 memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
858
859 /* Last packet in batch handled by usbnet */
860 if (hh.payload_len.word == skb->len)
861 return 1;
862
863 new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
864 if (new_skb)
865 usbnet_skb_return(dev, new_skb);
866
867 } /* while */
868
869 return 0;
870}
871
872/* ---------------------------- Transmit data path ----------------------*/
873static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev,
874 struct sk_buff *skb, gfp_t flags)
875{
876 struct sierra_net_data *priv = sierra_net_get_private(dev);
877 u16 len;
878 bool need_tail;
879
880 BUILD_BUG_ON(FIELD_SIZEOF(struct usbnet, data)
881 < sizeof(struct cdc_state));
882
883 dev_dbg(&dev->udev->dev, "%s", __func__);
884 if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
885 /* enough head room as is? */
886 if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
887 /* Save the Eth/IP length and set up HIP hdr */
888 len = skb->len;
889 skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
890 /* Handle ZLP issue */
891 need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
892 % dev->maxpacket == 0);
893 if (need_tail) {
894 if (unlikely(skb_tailroom(skb) == 0)) {
895 netdev_err(dev->net, "tx_fixup:"
896 "no room for packet\n");
897 dev_kfree_skb_any(skb);
898 return NULL;
899 } else {
900 skb->data[skb->len] = 0;
901 __skb_put(skb, 1);
902 len = len + 1;
903 }
904 }
905 build_hip(skb->data, len, priv);
906 return skb;
907 } else {
908 /*
909 * compensate in the future if necessary
910 */
911 netdev_err(dev->net, "tx_fixup: no room for HIP\n");
912 } /* headroom */
913 }
914
915 if (!priv->link_up)
916 dev->net->stats.tx_carrier_errors++;
917
918 /* tx_dropped incremented by usbnet */
919
920 /* filter the packet out, release it */
921 dev_kfree_skb_any(skb);
922 return NULL;
923}
924
925static const struct driver_info sierra_net_info_direct_ip = {
926 .description = "Sierra Wireless USB-to-WWAN Modem",
927 .flags = FLAG_WWAN | FLAG_SEND_ZLP,
928 .bind = sierra_net_bind,
929 .unbind = sierra_net_unbind,
930 .status = sierra_net_status,
931 .rx_fixup = sierra_net_rx_fixup,
932 .tx_fixup = sierra_net_tx_fixup,
933};
934
935static int
936sierra_net_probe(struct usb_interface *udev, const struct usb_device_id *prod)
937{
938 int ret;
939
940 ret = usbnet_probe(udev, prod);
941 if (ret == 0) {
942 struct usbnet *dev = usb_get_intfdata(udev);
943
944 ret = usbnet_status_start(dev, GFP_KERNEL);
945 if (ret == 0) {
946 /* Interrupt URB now set up; initiate sync sequence */
947 sierra_net_dosync(dev);
948 }
949 }
950 return ret;
951}
952
953#define DIRECT_IP_DEVICE(vend, prod) \
954 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
955 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
956 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
957 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
958 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
959 .driver_info = (unsigned long)&sierra_net_info_direct_ip}
960
961static const struct usb_device_id products[] = {
962 DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
963 DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
964 DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
965 DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
966
967 {}, /* last item */
968};
969MODULE_DEVICE_TABLE(usb, products);
970
971/* We are based on usbnet, so let it handle the USB driver specifics */
972static struct usb_driver sierra_net_driver = {
973 .name = "sierra_net",
974 .id_table = products,
975 .probe = sierra_net_probe,
976 .disconnect = usbnet_disconnect,
977 .suspend = usbnet_suspend,
978 .resume = usbnet_resume,
979 .no_dynamic_id = 1,
980 .disable_hub_initiated_lpm = 1,
981};
982
983module_usb_driver(sierra_net_driver);
984
985MODULE_AUTHOR(DRIVER_AUTHOR);
986MODULE_DESCRIPTION(DRIVER_DESC);
987MODULE_VERSION(DRIVER_VERSION);
988MODULE_LICENSE("GPL");