Loading...
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, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 */
27
28#define DRIVER_VERSION "v.2.0"
29#define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
30#define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
31static const char driver_name[] = "sierra_net";
32
33/* if defined debug messages enabled */
34/*#define DEBUG*/
35
36#include <linux/module.h>
37#include <linux/etherdevice.h>
38#include <linux/ethtool.h>
39#include <linux/mii.h>
40#include <linux/sched.h>
41#include <linux/timer.h>
42#include <linux/usb.h>
43#include <linux/usb/cdc.h>
44#include <net/ip.h>
45#include <net/udp.h>
46#include <asm/unaligned.h>
47#include <linux/usb/usbnet.h>
48
49#define SWI_USB_REQUEST_GET_FW_ATTR 0x06
50#define SWI_GET_FW_ATTR_MASK 0x08
51
52/* atomic counter partially included in MAC address to make sure 2 devices
53 * do not end up with the same MAC - concept breaks in case of > 255 ifaces
54 */
55static atomic_t iface_counter = ATOMIC_INIT(0);
56
57/*
58 * SYNC Timer Delay definition used to set the expiry time
59 */
60#define SIERRA_NET_SYNCDELAY (2*HZ)
61
62/* Max. MTU supported. The modem buffers are limited to 1500 */
63#define SIERRA_NET_MAX_SUPPORTED_MTU 1500
64
65/* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
66 * message reception ... and thus the max. received packet.
67 * (May be the cause for parse_hip returning -EINVAL)
68 */
69#define SIERRA_NET_USBCTL_BUF_LEN 1024
70
71/* list of interface numbers - used for constructing interface lists */
72struct sierra_net_iface_info {
73 const u32 infolen; /* number of interface numbers on list */
74 const u8 *ifaceinfo; /* pointer to the array holding the numbers */
75};
76
77struct sierra_net_info_data {
78 u16 rx_urb_size;
79 struct sierra_net_iface_info whitelist;
80};
81
82/* Private data structure */
83struct sierra_net_data {
84
85 u8 ethr_hdr_tmpl[ETH_HLEN]; /* ethernet header template for rx'd pkts */
86
87 u16 link_up; /* air link up or down */
88 u8 tx_hdr_template[4]; /* part of HIP hdr for tx'd packets */
89
90 u8 sync_msg[4]; /* SYNC message */
91 u8 shdwn_msg[4]; /* Shutdown message */
92
93 /* Backpointer to the container */
94 struct usbnet *usbnet;
95
96 u8 ifnum; /* interface number */
97
98/* Bit masks, must be a power of 2 */
99#define SIERRA_NET_EVENT_RESP_AVAIL 0x01
100#define SIERRA_NET_TIMER_EXPIRY 0x02
101 unsigned long kevent_flags;
102 struct work_struct sierra_net_kevent;
103 struct timer_list sync_timer; /* For retrying SYNC sequence */
104};
105
106struct param {
107 int is_present;
108 union {
109 void *ptr;
110 u32 dword;
111 u16 word;
112 u8 byte;
113 };
114};
115
116/* HIP message type */
117#define SIERRA_NET_HIP_EXTENDEDID 0x7F
118#define SIERRA_NET_HIP_HSYNC_ID 0x60 /* Modem -> host */
119#define SIERRA_NET_HIP_RESTART_ID 0x62 /* Modem -> host */
120#define SIERRA_NET_HIP_MSYNC_ID 0x20 /* Host -> modem */
121#define SIERRA_NET_HIP_SHUTD_ID 0x26 /* Host -> modem */
122
123#define SIERRA_NET_HIP_EXT_IP_IN_ID 0x0202
124#define SIERRA_NET_HIP_EXT_IP_OUT_ID 0x0002
125
126/* 3G UMTS Link Sense Indication definitions */
127#define SIERRA_NET_HIP_LSI_UMTSID 0x78
128
129/* Reverse Channel Grant Indication HIP message */
130#define SIERRA_NET_HIP_RCGI 0x64
131
132/* LSI Protocol types */
133#define SIERRA_NET_PROTOCOL_UMTS 0x01
134/* LSI Coverage */
135#define SIERRA_NET_COVERAGE_NONE 0x00
136#define SIERRA_NET_COVERAGE_NOPACKET 0x01
137
138/* LSI Session */
139#define SIERRA_NET_SESSION_IDLE 0x00
140/* LSI Link types */
141#define SIERRA_NET_AS_LINK_TYPE_IPv4 0x00
142
143struct lsi_umts {
144 u8 protocol;
145 u8 unused1;
146 __be16 length;
147 /* eventually use a union for the rest - assume umts for now */
148 u8 coverage;
149 u8 unused2[41];
150 u8 session_state;
151 u8 unused3[33];
152 u8 link_type;
153 u8 pdp_addr_len; /* NW-supplied PDP address len */
154 u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
155 u8 unused4[23];
156 u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
157 u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
158 u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
159 u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
160 u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
161 u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
162 u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
163 u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
164 u8 unused5[4];
165 u8 gw_addr_len; /* NW-supplied GW address len */
166 u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
167 u8 reserved[8];
168} __packed;
169
170#define SIERRA_NET_LSI_COMMON_LEN 4
171#define SIERRA_NET_LSI_UMTS_LEN (sizeof(struct lsi_umts))
172#define SIERRA_NET_LSI_UMTS_STATUS_LEN \
173 (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
174
175/* Forward definitions */
176static void sierra_sync_timer(unsigned long syncdata);
177static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
178
179/* Our own net device operations structure */
180static const struct net_device_ops sierra_net_device_ops = {
181 .ndo_open = usbnet_open,
182 .ndo_stop = usbnet_stop,
183 .ndo_start_xmit = usbnet_start_xmit,
184 .ndo_tx_timeout = usbnet_tx_timeout,
185 .ndo_change_mtu = sierra_net_change_mtu,
186 .ndo_set_mac_address = eth_mac_addr,
187 .ndo_validate_addr = eth_validate_addr,
188};
189
190/* get private data associated with passed in usbnet device */
191static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
192{
193 return (struct sierra_net_data *)dev->data[0];
194}
195
196/* set private data associated with passed in usbnet device */
197static inline void sierra_net_set_private(struct usbnet *dev,
198 struct sierra_net_data *priv)
199{
200 dev->data[0] = (unsigned long)priv;
201}
202
203/* is packet IPv4 */
204static inline int is_ip(struct sk_buff *skb)
205{
206 return skb->protocol == cpu_to_be16(ETH_P_IP);
207}
208
209/*
210 * check passed in packet and make sure that:
211 * - it is linear (no scatter/gather)
212 * - it is ethernet (mac_header properly set)
213 */
214static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
215{
216 skb_reset_mac_header(skb); /* ethernet header */
217
218 if (skb_is_nonlinear(skb)) {
219 netdev_err(dev->net, "Non linear buffer-dropping\n");
220 return 0;
221 }
222
223 if (!pskb_may_pull(skb, ETH_HLEN))
224 return 0;
225 skb->protocol = eth_hdr(skb)->h_proto;
226
227 return 1;
228}
229
230static const u8 *save16bit(struct param *p, const u8 *datap)
231{
232 p->is_present = 1;
233 p->word = get_unaligned_be16(datap);
234 return datap + sizeof(p->word);
235}
236
237static const u8 *save8bit(struct param *p, const u8 *datap)
238{
239 p->is_present = 1;
240 p->byte = *datap;
241 return datap + sizeof(p->byte);
242}
243
244/*----------------------------------------------------------------------------*
245 * BEGIN HIP *
246 *----------------------------------------------------------------------------*/
247/* HIP header */
248#define SIERRA_NET_HIP_HDR_LEN 4
249/* Extended HIP header */
250#define SIERRA_NET_HIP_EXT_HDR_LEN 6
251
252struct hip_hdr {
253 int hdrlen;
254 struct param payload_len;
255 struct param msgid;
256 struct param msgspecific;
257 struct param extmsgid;
258};
259
260static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
261{
262 const u8 *curp = buf;
263 int padded;
264
265 if (buflen < SIERRA_NET_HIP_HDR_LEN)
266 return -EPROTO;
267
268 curp = save16bit(&hh->payload_len, curp);
269 curp = save8bit(&hh->msgid, curp);
270 curp = save8bit(&hh->msgspecific, curp);
271
272 padded = hh->msgid.byte & 0x80;
273 hh->msgid.byte &= 0x7F; /* 7 bits */
274
275 hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
276 if (hh->extmsgid.is_present) {
277 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
278 return -EPROTO;
279
280 hh->payload_len.word &= 0x3FFF; /* 14 bits */
281
282 curp = save16bit(&hh->extmsgid, curp);
283 hh->extmsgid.word &= 0x03FF; /* 10 bits */
284
285 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
286 } else {
287 hh->payload_len.word &= 0x07FF; /* 11 bits */
288 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
289 }
290
291 if (padded) {
292 hh->hdrlen++;
293 hh->payload_len.word--;
294 }
295
296 /* if real packet shorter than the claimed length */
297 if (buflen < (hh->hdrlen + hh->payload_len.word))
298 return -EINVAL;
299
300 return 0;
301}
302
303static void build_hip(u8 *buf, const u16 payloadlen,
304 struct sierra_net_data *priv)
305{
306 /* the following doesn't have the full functionality. We
307 * currently build only one kind of header, so it is faster this way
308 */
309 put_unaligned_be16(payloadlen, buf);
310 memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
311}
312/*----------------------------------------------------------------------------*
313 * END HIP *
314 *----------------------------------------------------------------------------*/
315
316static int sierra_net_send_cmd(struct usbnet *dev,
317 u8 *cmd, int cmdlen, const char * cmd_name)
318{
319 struct sierra_net_data *priv = sierra_net_get_private(dev);
320 int status;
321
322 status = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
323 USB_CDC_SEND_ENCAPSULATED_COMMAND,
324 USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE, 0,
325 priv->ifnum, cmd, cmdlen, USB_CTRL_SET_TIMEOUT);
326
327 if (status != cmdlen && status != -ENODEV)
328 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
329
330 return status;
331}
332
333static int sierra_net_send_sync(struct usbnet *dev)
334{
335 int status;
336 struct sierra_net_data *priv = sierra_net_get_private(dev);
337
338 dev_dbg(&dev->udev->dev, "%s", __func__);
339
340 status = sierra_net_send_cmd(dev, priv->sync_msg,
341 sizeof(priv->sync_msg), "SYNC");
342
343 return status;
344}
345
346static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
347{
348 dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
349 priv->tx_hdr_template[0] = 0x3F;
350 priv->tx_hdr_template[1] = ctx_ix;
351 *((u16 *)&priv->tx_hdr_template[2]) =
352 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
353}
354
355static inline int sierra_net_is_valid_addrlen(u8 len)
356{
357 return len == sizeof(struct in_addr);
358}
359
360static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
361{
362 struct lsi_umts *lsi = (struct lsi_umts *)data;
363
364 if (datalen < sizeof(struct lsi_umts)) {
365 netdev_err(dev->net, "%s: Data length %d, exp %Zu\n",
366 __func__, datalen,
367 sizeof(struct lsi_umts));
368 return -1;
369 }
370
371 if (lsi->length != cpu_to_be16(SIERRA_NET_LSI_UMTS_STATUS_LEN)) {
372 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
373 __func__, be16_to_cpu(lsi->length),
374 (u32)SIERRA_NET_LSI_UMTS_STATUS_LEN);
375 return -1;
376 }
377
378 /* Validate the protocol - only support UMTS for now */
379 if (lsi->protocol != SIERRA_NET_PROTOCOL_UMTS) {
380 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
381 lsi->protocol);
382 return -1;
383 }
384
385 /* Validate the link type */
386 if (lsi->link_type != SIERRA_NET_AS_LINK_TYPE_IPv4) {
387 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
388 lsi->link_type);
389 return -1;
390 }
391
392 /* Validate the coverage */
393 if (lsi->coverage == SIERRA_NET_COVERAGE_NONE
394 || lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
395 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
396 return 0;
397 }
398
399 /* Validate the session state */
400 if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
401 netdev_err(dev->net, "Session idle, 0x%02x\n",
402 lsi->session_state);
403 return 0;
404 }
405
406 /* Set link_sense true */
407 return 1;
408}
409
410static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
411 struct hip_hdr *hh)
412{
413 struct sierra_net_data *priv = sierra_net_get_private(dev);
414 int link_up;
415
416 link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
417 hh->payload_len.word);
418 if (link_up < 0) {
419 netdev_err(dev->net, "Invalid LSI\n");
420 return;
421 }
422 if (link_up) {
423 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
424 priv->link_up = 1;
425 netif_carrier_on(dev->net);
426 } else {
427 priv->link_up = 0;
428 netif_carrier_off(dev->net);
429 }
430}
431
432static void sierra_net_dosync(struct usbnet *dev)
433{
434 int status;
435 struct sierra_net_data *priv = sierra_net_get_private(dev);
436
437 dev_dbg(&dev->udev->dev, "%s", __func__);
438
439 /* tell modem we are ready */
440 status = sierra_net_send_sync(dev);
441 if (status < 0)
442 netdev_err(dev->net,
443 "Send SYNC failed, status %d\n", status);
444 status = sierra_net_send_sync(dev);
445 if (status < 0)
446 netdev_err(dev->net,
447 "Send SYNC failed, status %d\n", status);
448
449 /* Now, start a timer and make sure we get the Restart Indication */
450 priv->sync_timer.function = sierra_sync_timer;
451 priv->sync_timer.data = (unsigned long) dev;
452 priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
453 add_timer(&priv->sync_timer);
454}
455
456static void sierra_net_kevent(struct work_struct *work)
457{
458 struct sierra_net_data *priv =
459 container_of(work, struct sierra_net_data, sierra_net_kevent);
460 struct usbnet *dev = priv->usbnet;
461 int len;
462 int err;
463 u8 *buf;
464 u8 ifnum;
465
466 if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
467 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
468
469 /* Query the modem for the LSI message */
470 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
471 if (!buf) {
472 netdev_err(dev->net,
473 "failed to allocate buf for LS msg\n");
474 return;
475 }
476 ifnum = priv->ifnum;
477 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
478 USB_CDC_GET_ENCAPSULATED_RESPONSE,
479 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
480 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
481 USB_CTRL_SET_TIMEOUT);
482
483 if (len < 0) {
484 netdev_err(dev->net,
485 "usb_control_msg failed, status %d\n", len);
486 } else {
487 struct hip_hdr hh;
488
489 dev_dbg(&dev->udev->dev, "%s: Received status message,"
490 " %04x bytes", __func__, len);
491
492 err = parse_hip(buf, len, &hh);
493 if (err) {
494 netdev_err(dev->net, "%s: Bad packet,"
495 " parse result %d\n", __func__, err);
496 kfree(buf);
497 return;
498 }
499
500 /* Validate packet length */
501 if (len != hh.hdrlen + hh.payload_len.word) {
502 netdev_err(dev->net, "%s: Bad packet, received"
503 " %d, expected %d\n", __func__, len,
504 hh.hdrlen + hh.payload_len.word);
505 kfree(buf);
506 return;
507 }
508
509 /* Switch on received message types */
510 switch (hh.msgid.byte) {
511 case SIERRA_NET_HIP_LSI_UMTSID:
512 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
513 hh.msgspecific.byte);
514 sierra_net_handle_lsi(dev, buf, &hh);
515 break;
516 case SIERRA_NET_HIP_RESTART_ID:
517 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
518 " stopping sync timer",
519 hh.msgspecific.byte);
520 /* Got sync resp - stop timer & clear mask */
521 del_timer_sync(&priv->sync_timer);
522 clear_bit(SIERRA_NET_TIMER_EXPIRY,
523 &priv->kevent_flags);
524 break;
525 case SIERRA_NET_HIP_HSYNC_ID:
526 dev_dbg(&dev->udev->dev, "SYNC received");
527 err = sierra_net_send_sync(dev);
528 if (err < 0)
529 netdev_err(dev->net,
530 "Send SYNC failed %d\n", err);
531 break;
532 case SIERRA_NET_HIP_EXTENDEDID:
533 netdev_err(dev->net, "Unrecognized HIP msg, "
534 "extmsgid 0x%04x\n", hh.extmsgid.word);
535 break;
536 case SIERRA_NET_HIP_RCGI:
537 /* Ignored */
538 break;
539 default:
540 netdev_err(dev->net, "Unrecognized HIP msg, "
541 "msgid 0x%02x\n", hh.msgid.byte);
542 break;
543 }
544 }
545 kfree(buf);
546 }
547 /* The sync timer bit might be set */
548 if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
549 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
550 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
551 sierra_net_dosync(priv->usbnet);
552 }
553
554 if (priv->kevent_flags)
555 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
556 "kevent_flags = 0x%lx", priv->kevent_flags);
557}
558
559static void sierra_net_defer_kevent(struct usbnet *dev, int work)
560{
561 struct sierra_net_data *priv = sierra_net_get_private(dev);
562
563 set_bit(work, &priv->kevent_flags);
564 schedule_work(&priv->sierra_net_kevent);
565}
566
567/*
568 * Sync Retransmit Timer Handler. On expiry, kick the work queue
569 */
570void sierra_sync_timer(unsigned long syncdata)
571{
572 struct usbnet *dev = (struct usbnet *)syncdata;
573
574 dev_dbg(&dev->udev->dev, "%s", __func__);
575 /* Kick the tasklet */
576 sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
577}
578
579static void sierra_net_status(struct usbnet *dev, struct urb *urb)
580{
581 struct usb_cdc_notification *event;
582
583 dev_dbg(&dev->udev->dev, "%s", __func__);
584
585 if (urb->actual_length < sizeof *event)
586 return;
587
588 /* Add cases to handle other standard notifications. */
589 event = urb->transfer_buffer;
590 switch (event->bNotificationType) {
591 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
592 case USB_CDC_NOTIFY_SPEED_CHANGE:
593 /* USB 305 sends those */
594 break;
595 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
596 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
597 break;
598 default:
599 netdev_err(dev->net, ": unexpected notification %02x!\n",
600 event->bNotificationType);
601 break;
602 }
603}
604
605static void sierra_net_get_drvinfo(struct net_device *net,
606 struct ethtool_drvinfo *info)
607{
608 /* Inherit standard device info */
609 usbnet_get_drvinfo(net, info);
610 strncpy(info->driver, driver_name, sizeof info->driver);
611 strncpy(info->version, DRIVER_VERSION, sizeof info->version);
612}
613
614static u32 sierra_net_get_link(struct net_device *net)
615{
616 struct usbnet *dev = netdev_priv(net);
617 /* Report link is down whenever the interface is down */
618 return sierra_net_get_private(dev)->link_up && netif_running(net);
619}
620
621static const struct ethtool_ops sierra_net_ethtool_ops = {
622 .get_drvinfo = sierra_net_get_drvinfo,
623 .get_link = sierra_net_get_link,
624 .get_msglevel = usbnet_get_msglevel,
625 .set_msglevel = usbnet_set_msglevel,
626 .get_settings = usbnet_get_settings,
627 .set_settings = usbnet_set_settings,
628 .nway_reset = usbnet_nway_reset,
629};
630
631/* MTU can not be more than 1500 bytes, enforce it. */
632static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
633{
634 if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
635 return -EINVAL;
636
637 return usbnet_change_mtu(net, new_mtu);
638}
639
640static int is_whitelisted(const u8 ifnum,
641 const struct sierra_net_iface_info *whitelist)
642{
643 if (whitelist) {
644 const u8 *list = whitelist->ifaceinfo;
645 int i;
646
647 for (i = 0; i < whitelist->infolen; i++) {
648 if (list[i] == ifnum)
649 return 1;
650 }
651 }
652 return 0;
653}
654
655static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
656{
657 int result = 0;
658 u16 *attrdata;
659
660 attrdata = kmalloc(sizeof(*attrdata), GFP_KERNEL);
661 if (!attrdata)
662 return -ENOMEM;
663
664 result = usb_control_msg(
665 dev->udev,
666 usb_rcvctrlpipe(dev->udev, 0),
667 /* _u8 vendor specific request */
668 SWI_USB_REQUEST_GET_FW_ATTR,
669 USB_DIR_IN | USB_TYPE_VENDOR, /* __u8 request type */
670 0x0000, /* __u16 value not used */
671 0x0000, /* __u16 index not used */
672 attrdata, /* char *data */
673 sizeof(*attrdata), /* __u16 size */
674 USB_CTRL_SET_TIMEOUT); /* int timeout */
675
676 if (result < 0) {
677 kfree(attrdata);
678 return -EIO;
679 }
680
681 *datap = *attrdata;
682
683 kfree(attrdata);
684 return result;
685}
686
687/*
688 * collects the bulk endpoints, the status endpoint.
689 */
690static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
691{
692 u8 ifacenum;
693 u8 numendpoints;
694 u16 fwattr = 0;
695 int status;
696 struct ethhdr *eth;
697 struct sierra_net_data *priv;
698 static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
699 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
700 static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
701 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
702
703 struct sierra_net_info_data *data =
704 (struct sierra_net_info_data *)dev->driver_info->data;
705
706 dev_dbg(&dev->udev->dev, "%s", __func__);
707
708 ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
709 /* We only accept certain interfaces */
710 if (!is_whitelisted(ifacenum, &data->whitelist)) {
711 dev_dbg(&dev->udev->dev, "Ignoring interface: %d", ifacenum);
712 return -ENODEV;
713 }
714 numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
715 /* We have three endpoints, bulk in and out, and a status */
716 if (numendpoints != 3) {
717 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
718 numendpoints);
719 return -ENODEV;
720 }
721 /* Status endpoint set in usbnet_get_endpoints() */
722 dev->status = NULL;
723 status = usbnet_get_endpoints(dev, intf);
724 if (status < 0) {
725 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
726 status);
727 return -ENODEV;
728 }
729 /* Initialize sierra private data */
730 priv = kzalloc(sizeof *priv, GFP_KERNEL);
731 if (!priv) {
732 dev_err(&dev->udev->dev, "No memory");
733 return -ENOMEM;
734 }
735
736 priv->usbnet = dev;
737 priv->ifnum = ifacenum;
738 dev->net->netdev_ops = &sierra_net_device_ops;
739
740 /* change MAC addr to include, ifacenum, and to be unique */
741 dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
742 dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
743
744 /* we will have to manufacture ethernet headers, prepare template */
745 eth = (struct ethhdr *)priv->ethr_hdr_tmpl;
746 memcpy(ð->h_dest, dev->net->dev_addr, ETH_ALEN);
747 eth->h_proto = cpu_to_be16(ETH_P_IP);
748
749 /* prepare shutdown message template */
750 memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
751 /* set context index initially to 0 - prepares tx hdr template */
752 sierra_net_set_ctx_index(priv, 0);
753
754 /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
755 dev->rx_urb_size = data->rx_urb_size;
756 if (dev->udev->speed != USB_SPEED_HIGH)
757 dev->rx_urb_size = min_t(size_t, 4096, data->rx_urb_size);
758
759 dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
760 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
761
762 /* Set up the netdev */
763 dev->net->flags |= IFF_NOARP;
764 dev->net->ethtool_ops = &sierra_net_ethtool_ops;
765 netif_carrier_off(dev->net);
766
767 sierra_net_set_private(dev, priv);
768
769 priv->kevent_flags = 0;
770
771 /* Use the shared workqueue */
772 INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
773
774 /* Only need to do this once */
775 init_timer(&priv->sync_timer);
776
777 /* verify fw attributes */
778 status = sierra_net_get_fw_attr(dev, &fwattr);
779 dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
780
781 /* test whether firmware supports DHCP */
782 if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
783 /* found incompatible firmware version */
784 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
785 " versions\n");
786 kfree(priv);
787 return -ENODEV;
788 }
789 /* prepare sync message from template */
790 memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
791
792 /* initiate the sync sequence */
793 sierra_net_dosync(dev);
794
795 return 0;
796}
797
798static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
799{
800 int status;
801 struct sierra_net_data *priv = sierra_net_get_private(dev);
802
803 dev_dbg(&dev->udev->dev, "%s", __func__);
804
805 /* kill the timer and work */
806 del_timer_sync(&priv->sync_timer);
807 cancel_work_sync(&priv->sierra_net_kevent);
808
809 /* tell modem we are going away */
810 status = sierra_net_send_cmd(dev, priv->shdwn_msg,
811 sizeof(priv->shdwn_msg), "Shutdown");
812 if (status < 0)
813 netdev_err(dev->net,
814 "usb_control_msg failed, status %d\n", status);
815
816 sierra_net_set_private(dev, NULL);
817
818 kfree(priv);
819}
820
821static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
822 struct sk_buff *skb, int len)
823{
824 struct sk_buff *new_skb;
825
826 /* clone skb */
827 new_skb = skb_clone(skb, GFP_ATOMIC);
828
829 /* remove len bytes from original */
830 skb_pull(skb, len);
831
832 /* trim next packet to it's length */
833 if (new_skb) {
834 skb_trim(new_skb, len);
835 } else {
836 if (netif_msg_rx_err(dev))
837 netdev_err(dev->net, "failed to get skb\n");
838 dev->net->stats.rx_dropped++;
839 }
840
841 return new_skb;
842}
843
844/* ---------------------------- Receive data path ----------------------*/
845static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
846{
847 int err;
848 struct hip_hdr hh;
849 struct sk_buff *new_skb;
850
851 dev_dbg(&dev->udev->dev, "%s", __func__);
852
853 /* could contain multiple packets */
854 while (likely(skb->len)) {
855 err = parse_hip(skb->data, skb->len, &hh);
856 if (err) {
857 if (netif_msg_rx_err(dev))
858 netdev_err(dev->net, "Invalid HIP header %d\n",
859 err);
860 /* dev->net->stats.rx_errors incremented by caller */
861 dev->net->stats.rx_length_errors++;
862 return 0;
863 }
864
865 /* Validate Extended HIP header */
866 if (!hh.extmsgid.is_present
867 || hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
868 if (netif_msg_rx_err(dev))
869 netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
870
871 dev->net->stats.rx_frame_errors++;
872 /* dev->net->stats.rx_errors incremented by caller */;
873 return 0;
874 }
875
876 skb_pull(skb, hh.hdrlen);
877
878 /* We are going to accept this packet, prepare it */
879 memcpy(skb->data, sierra_net_get_private(dev)->ethr_hdr_tmpl,
880 ETH_HLEN);
881
882 /* Last packet in batch handled by usbnet */
883 if (hh.payload_len.word == skb->len)
884 return 1;
885
886 new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
887 if (new_skb)
888 usbnet_skb_return(dev, new_skb);
889
890 } /* while */
891
892 return 0;
893}
894
895/* ---------------------------- Transmit data path ----------------------*/
896struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
897 gfp_t flags)
898{
899 struct sierra_net_data *priv = sierra_net_get_private(dev);
900 u16 len;
901 bool need_tail;
902
903 BUILD_BUG_ON(FIELD_SIZEOF(struct usbnet, data)
904 < sizeof(struct cdc_state));
905
906 dev_dbg(&dev->udev->dev, "%s", __func__);
907 if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
908 /* enough head room as is? */
909 if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
910 /* Save the Eth/IP length and set up HIP hdr */
911 len = skb->len;
912 skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
913 /* Handle ZLP issue */
914 need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
915 % dev->maxpacket == 0);
916 if (need_tail) {
917 if (unlikely(skb_tailroom(skb) == 0)) {
918 netdev_err(dev->net, "tx_fixup:"
919 "no room for packet\n");
920 dev_kfree_skb_any(skb);
921 return NULL;
922 } else {
923 skb->data[skb->len] = 0;
924 __skb_put(skb, 1);
925 len = len + 1;
926 }
927 }
928 build_hip(skb->data, len, priv);
929 return skb;
930 } else {
931 /*
932 * compensate in the future if necessary
933 */
934 netdev_err(dev->net, "tx_fixup: no room for HIP\n");
935 } /* headroom */
936 }
937
938 if (!priv->link_up)
939 dev->net->stats.tx_carrier_errors++;
940
941 /* tx_dropped incremented by usbnet */
942
943 /* filter the packet out, release it */
944 dev_kfree_skb_any(skb);
945 return NULL;
946}
947
948static const u8 sierra_net_ifnum_list[] = { 7, 10, 11 };
949static const struct sierra_net_info_data sierra_net_info_data_direct_ip = {
950 .rx_urb_size = 8 * 1024,
951 .whitelist = {
952 .infolen = ARRAY_SIZE(sierra_net_ifnum_list),
953 .ifaceinfo = sierra_net_ifnum_list
954 }
955};
956
957static const struct driver_info sierra_net_info_direct_ip = {
958 .description = "Sierra Wireless USB-to-WWAN Modem",
959 .flags = FLAG_WWAN | FLAG_SEND_ZLP,
960 .bind = sierra_net_bind,
961 .unbind = sierra_net_unbind,
962 .status = sierra_net_status,
963 .rx_fixup = sierra_net_rx_fixup,
964 .tx_fixup = sierra_net_tx_fixup,
965 .data = (unsigned long)&sierra_net_info_data_direct_ip,
966};
967
968static const struct usb_device_id products[] = {
969 {USB_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
970 .driver_info = (unsigned long) &sierra_net_info_direct_ip},
971 {USB_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
972 .driver_info = (unsigned long) &sierra_net_info_direct_ip},
973 {USB_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
974 .driver_info = (unsigned long) &sierra_net_info_direct_ip},
975 {USB_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
976 .driver_info = (unsigned long) &sierra_net_info_direct_ip},
977
978 {}, /* last item */
979};
980MODULE_DEVICE_TABLE(usb, products);
981
982/* We are based on usbnet, so let it handle the USB driver specifics */
983static struct usb_driver sierra_net_driver = {
984 .name = "sierra_net",
985 .id_table = products,
986 .probe = usbnet_probe,
987 .disconnect = usbnet_disconnect,
988 .suspend = usbnet_suspend,
989 .resume = usbnet_resume,
990 .no_dynamic_id = 1,
991 .disable_hub_initiated_lpm = 1,
992};
993
994module_usb_driver(sierra_net_driver);
995
996MODULE_AUTHOR(DRIVER_AUTHOR);
997MODULE_DESCRIPTION(DRIVER_DESC);
998MODULE_VERSION(DRIVER_VERSION);
999MODULE_LICENSE("GPL");