1/* 2 * cdc_ncm.c 3 * 4 * Copyright (C) ST-Ericsson 2010-2012 5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com> 6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com> 7 * 8 * USB Host Driver for Network Control Model (NCM) 9 * http://www.usb.org/developers/devclass_docs/NCM10.zip 10 * 11 * The NCM encoding, decoding and initialization logic 12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h 13 * 14 * This software is available to you under a choice of one of two 15 * licenses. You may choose this file to be licensed under the terms 16 * of the GNU General Public License (GPL) Version 2 or the 2-clause 17 * BSD license listed below: 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41#include <linux/module.h> 42#include <linux/netdevice.h> 43#include <linux/ctype.h> 44#include <linux/ethtool.h> 45#include <linux/workqueue.h> 46#include <linux/mii.h> 47#include <linux/crc32.h> 48#include <linux/usb.h> 49#include <linux/hrtimer.h> 50#include <linux/atomic.h> 51#include <linux/usb/usbnet.h> 52#include <linux/usb/cdc.h> 53#include <linux/usb/cdc_ncm.h> 54 55#if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM) 56static bool prefer_mbim = true; 57#else 58static bool prefer_mbim; 59#endif 60module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR); 61MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions"); 62 63static void cdc_ncm_txpath_bh(unsigned long param); 64static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); 65static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); 66static struct usb_driver cdc_ncm_driver; 67 68struct cdc_ncm_stats { 69 char stat_string[ETH_GSTRING_LEN]; 70 int sizeof_stat; 71 int stat_offset; 72}; 73 74#define CDC_NCM_STAT(str, m) { \ 75 .stat_string = str, \ 76 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \ 77 .stat_offset = offsetof(struct cdc_ncm_ctx, m) } 78#define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m) 79 80static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = { 81 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full), 82 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full), 83 CDC_NCM_SIMPLE_STAT(tx_reason_timeout), 84 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram), 85 CDC_NCM_SIMPLE_STAT(tx_overhead), 86 CDC_NCM_SIMPLE_STAT(tx_ntbs), 87 CDC_NCM_SIMPLE_STAT(rx_overhead), 88 CDC_NCM_SIMPLE_STAT(rx_ntbs), 89}; 90 91static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset) 92{ 93 switch (sset) { 94 case ETH_SS_STATS: 95 return ARRAY_SIZE(cdc_ncm_gstrings_stats); 96 default: 97 return -EOPNOTSUPP; 98 } 99} 100 101static void cdc_ncm_get_ethtool_stats(struct net_device *netdev, 102 struct ethtool_stats __always_unused *stats, 103 u64 *data) 104{ 105 struct usbnet *dev = netdev_priv(netdev); 106 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 107 int i; 108 char *p = NULL; 109 110 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 111 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset; 112 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p; 113 } 114} 115 116static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data) 117{ 118 u8 *p = data; 119 int i; 120 121 switch (stringset) { 122 case ETH_SS_STATS: 123 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 124 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN); 125 p += ETH_GSTRING_LEN; 126 } 127 } 128} 129 130static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx); 131 132static const struct ethtool_ops cdc_ncm_ethtool_ops = { 133 .get_settings = usbnet_get_settings, 134 .set_settings = usbnet_set_settings, 135 .get_link = usbnet_get_link, 136 .nway_reset = usbnet_nway_reset, 137 .get_drvinfo = usbnet_get_drvinfo, 138 .get_msglevel = usbnet_get_msglevel, 139 .set_msglevel = usbnet_set_msglevel, 140 .get_ts_info = ethtool_op_get_ts_info, 141 .get_sset_count = cdc_ncm_get_sset_count, 142 .get_strings = cdc_ncm_get_strings, 143 .get_ethtool_stats = cdc_ncm_get_ethtool_stats, 144}; 145 146static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx) 147{ 148 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 149 u32 val, max, min; 150 151 /* clamp new_rx to sane values */ 152 min = USB_CDC_NCM_NTB_MIN_IN_SIZE; 153 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 154 155 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */ 156 if (max < min) { 157 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n", 158 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min); 159 max = min; 160 } 161 162 val = clamp_t(u32, new_rx, min, max); 163 if (val != new_rx) 164 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max); 165 166 return val; 167} 168 169static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx) 170{ 171 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 172 u32 val, max, min; 173 174 /* clamp new_tx to sane values */ 175 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16); 176 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 177 178 /* some devices set dwNtbOutMaxSize too low for the above default */ 179 min = min(min, max); 180 181 val = clamp_t(u32, new_tx, min, max); 182 if (val != new_tx) 183 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max); 184 185 return val; 186} 187 188static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf) 189{ 190 struct usbnet *dev = netdev_priv(to_net_dev(d)); 191 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 192 193 return sprintf(buf, "%u\n", ctx->min_tx_pkt); 194} 195 196static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf) 197{ 198 struct usbnet *dev = netdev_priv(to_net_dev(d)); 199 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 200 201 return sprintf(buf, "%u\n", ctx->rx_max); 202} 203 204static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf) 205{ 206 struct usbnet *dev = netdev_priv(to_net_dev(d)); 207 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 208 209 return sprintf(buf, "%u\n", ctx->tx_max); 210} 211 212static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf) 213{ 214 struct usbnet *dev = netdev_priv(to_net_dev(d)); 215 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 216 217 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC); 218} 219 220static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 221{ 222 struct usbnet *dev = netdev_priv(to_net_dev(d)); 223 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 224 unsigned long val; 225 226 /* no need to restrict values - anything from 0 to infinity is OK */ 227 if (kstrtoul(buf, 0, &val)) 228 return -EINVAL; 229 230 ctx->min_tx_pkt = val; 231 return len; 232} 233 234static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 235{ 236 struct usbnet *dev = netdev_priv(to_net_dev(d)); 237 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 238 unsigned long val; 239 240 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val) 241 return -EINVAL; 242 243 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max); 244 return len; 245} 246 247static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 248{ 249 struct usbnet *dev = netdev_priv(to_net_dev(d)); 250 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 251 unsigned long val; 252 253 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val) 254 return -EINVAL; 255 256 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val); 257 return len; 258} 259 260static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 261{ 262 struct usbnet *dev = netdev_priv(to_net_dev(d)); 263 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 264 ssize_t ret; 265 unsigned long val; 266 267 ret = kstrtoul(buf, 0, &val); 268 if (ret) 269 return ret; 270 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX)) 271 return -EINVAL; 272 273 spin_lock_bh(&ctx->mtx); 274 ctx->timer_interval = val * NSEC_PER_USEC; 275 if (!ctx->timer_interval) 276 ctx->tx_timer_pending = 0; 277 spin_unlock_bh(&ctx->mtx); 278 return len; 279} 280 281static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt); 282static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max); 283static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max); 284static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs); 285 286#define NCM_PARM_ATTR(name, format, tocpu) \ 287static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \ 288{ \ 289 struct usbnet *dev = netdev_priv(to_net_dev(d)); \ 290 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \ 291 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \ 292} \ 293static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL) 294 295NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu); 296NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu); 297NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu); 298NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu); 299NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu); 300NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu); 301NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu); 302NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu); 303NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu); 304NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu); 305 306static struct attribute *cdc_ncm_sysfs_attrs[] = { 307 &dev_attr_min_tx_pkt.attr, 308 &dev_attr_rx_max.attr, 309 &dev_attr_tx_max.attr, 310 &dev_attr_tx_timer_usecs.attr, 311 &dev_attr_bmNtbFormatsSupported.attr, 312 &dev_attr_dwNtbInMaxSize.attr, 313 &dev_attr_wNdpInDivisor.attr, 314 &dev_attr_wNdpInPayloadRemainder.attr, 315 &dev_attr_wNdpInAlignment.attr, 316 &dev_attr_dwNtbOutMaxSize.attr, 317 &dev_attr_wNdpOutDivisor.attr, 318 &dev_attr_wNdpOutPayloadRemainder.attr, 319 &dev_attr_wNdpOutAlignment.attr, 320 &dev_attr_wNtbOutMaxDatagrams.attr, 321 NULL, 322}; 323 324static struct attribute_group cdc_ncm_sysfs_attr_group = { 325 .name = "cdc_ncm", 326 .attrs = cdc_ncm_sysfs_attrs, 327}; 328 329/* handle rx_max and tx_max changes */ 330static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx) 331{ 332 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 333 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 334 u32 val; 335 336 val = cdc_ncm_check_rx_max(dev, new_rx); 337 338 /* inform device about NTB input size changes */ 339 if (val != ctx->rx_max) { 340 __le32 dwNtbInMaxSize = cpu_to_le32(val); 341 342 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val); 343 344 /* tell device to use new size */ 345 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE, 346 USB_TYPE_CLASS | USB_DIR_OUT 347 | USB_RECIP_INTERFACE, 348 0, iface_no, &dwNtbInMaxSize, 4) < 0) 349 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n"); 350 else 351 ctx->rx_max = val; 352 } 353 354 /* usbnet use these values for sizing rx queues */ 355 if (dev->rx_urb_size != ctx->rx_max) { 356 dev->rx_urb_size = ctx->rx_max; 357 if (netif_running(dev->net)) 358 usbnet_unlink_rx_urbs(dev); 359 } 360 361 val = cdc_ncm_check_tx_max(dev, new_tx); 362 if (val != ctx->tx_max) 363 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val); 364 365 /* Adding a pad byte here if necessary simplifies the handling 366 * in cdc_ncm_fill_tx_frame, making tx_max always represent 367 * the real skb max size. 368 * 369 * We cannot use dev->maxpacket here because this is called from 370 * .bind which is called before usbnet sets up dev->maxpacket 371 */ 372 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) && 373 val % usb_maxpacket(dev->udev, dev->out, 1) == 0) 374 val++; 375 376 /* we might need to flush any pending tx buffers if running */ 377 if (netif_running(dev->net) && val > ctx->tx_max) { 378 netif_tx_lock_bh(dev->net); 379 usbnet_start_xmit(NULL, dev->net); 380 /* make sure tx_curr_skb is reallocated if it was empty */ 381 if (ctx->tx_curr_skb) { 382 dev_kfree_skb_any(ctx->tx_curr_skb); 383 ctx->tx_curr_skb = NULL; 384 } 385 ctx->tx_max = val; 386 netif_tx_unlock_bh(dev->net); 387 } else { 388 ctx->tx_max = val; 389 } 390 391 dev->hard_mtu = ctx->tx_max; 392 393 /* max qlen depend on hard_mtu and rx_urb_size */ 394 usbnet_update_max_qlen(dev); 395 396 /* never pad more than 3 full USB packets per transfer */ 397 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1), 398 CDC_NCM_MIN_TX_PKT, ctx->tx_max); 399} 400 401/* helpers for NCM and MBIM differences */ 402static u8 cdc_ncm_flags(struct usbnet *dev) 403{ 404 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 405 406 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 407 return ctx->mbim_desc->bmNetworkCapabilities; 408 if (ctx->func_desc) 409 return ctx->func_desc->bmNetworkCapabilities; 410 return 0; 411} 412 413static int cdc_ncm_eth_hlen(struct usbnet *dev) 414{ 415 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 416 return 0; 417 return ETH_HLEN; 418} 419 420static u32 cdc_ncm_min_dgram_size(struct usbnet *dev) 421{ 422 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 423 return CDC_MBIM_MIN_DATAGRAM_SIZE; 424 return CDC_NCM_MIN_DATAGRAM_SIZE; 425} 426 427static u32 cdc_ncm_max_dgram_size(struct usbnet *dev) 428{ 429 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 430 431 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 432 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize); 433 if (ctx->ether_desc) 434 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); 435 return CDC_NCM_MAX_DATAGRAM_SIZE; 436} 437 438/* initial one-time device setup. MUST be called with the data interface 439 * in altsetting 0 440 */ 441static int cdc_ncm_init(struct usbnet *dev) 442{ 443 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 444 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 445 int err; 446 447 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS, 448 USB_TYPE_CLASS | USB_DIR_IN 449 |USB_RECIP_INTERFACE, 450 0, iface_no, &ctx->ncm_parm, 451 sizeof(ctx->ncm_parm)); 452 if (err < 0) { 453 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n"); 454 return err; /* GET_NTB_PARAMETERS is required */ 455 } 456 457 /* set CRC Mode */ 458 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) { 459 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n"); 460 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE, 461 USB_TYPE_CLASS | USB_DIR_OUT 462 | USB_RECIP_INTERFACE, 463 USB_CDC_NCM_CRC_NOT_APPENDED, 464 iface_no, NULL, 0); 465 if (err < 0) 466 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n"); 467 } 468 469 /* set NTB format, if both formats are supported. 470 * 471 * "The host shall only send this command while the NCM Data 472 * Interface is in alternate setting 0." 473 */ 474 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) & 475 USB_CDC_NCM_NTB32_SUPPORTED) { 476 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n"); 477 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT, 478 USB_TYPE_CLASS | USB_DIR_OUT 479 | USB_RECIP_INTERFACE, 480 USB_CDC_NCM_NTB16_FORMAT, 481 iface_no, NULL, 0); 482 if (err < 0) 483 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n"); 484 } 485 486 /* set initial device values */ 487 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); 488 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); 489 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); 490 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); 491 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); 492 /* devices prior to NCM Errata shall set this field to zero */ 493 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); 494 495 dev_dbg(&dev->intf->dev, 496 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", 497 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, 498 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev)); 499 500 /* max count of tx datagrams */ 501 if ((ctx->tx_max_datagrams == 0) || 502 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) 503 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; 504 505 /* set up maximum NDP size */ 506 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16); 507 508 /* initial coalescing timer interval */ 509 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC; 510 511 return 0; 512} 513 514/* set a new max datagram size */ 515static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size) 516{ 517 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 518 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 519 __le16 max_datagram_size; 520 u16 mbim_mtu; 521 int err; 522 523 /* set default based on descriptors */ 524 ctx->max_datagram_size = clamp_t(u32, new_size, 525 cdc_ncm_min_dgram_size(dev), 526 CDC_NCM_MAX_DATAGRAM_SIZE); 527 528 /* inform the device about the selected Max Datagram Size? */ 529 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE)) 530 goto out; 531 532 /* read current mtu value from device */ 533 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE, 534 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE, 535 0, iface_no, &max_datagram_size, 2); 536 if (err < 0) { 537 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n"); 538 goto out; 539 } 540 541 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size) 542 goto out; 543 544 max_datagram_size = cpu_to_le16(ctx->max_datagram_size); 545 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE, 546 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE, 547 0, iface_no, &max_datagram_size, 2); 548 if (err < 0) 549 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n"); 550 551out: 552 /* set MTU to max supported by the device if necessary */ 553 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev)); 554 555 /* do not exceed operater preferred MTU */ 556 if (ctx->mbim_extended_desc) { 557 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU); 558 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu) 559 dev->net->mtu = mbim_mtu; 560 } 561} 562 563static void cdc_ncm_fix_modulus(struct usbnet *dev) 564{ 565 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 566 u32 val; 567 568 /* 569 * verify that the structure alignment is: 570 * - power of two 571 * - not greater than the maximum transmit length 572 * - not less than four bytes 573 */ 574 val = ctx->tx_ndp_modulus; 575 576 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 577 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 578 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n"); 579 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 580 } 581 582 /* 583 * verify that the payload alignment is: 584 * - power of two 585 * - not greater than the maximum transmit length 586 * - not less than four bytes 587 */ 588 val = ctx->tx_modulus; 589 590 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 591 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 592 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n"); 593 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 594 } 595 596 /* verify the payload remainder */ 597 if (ctx->tx_remainder >= ctx->tx_modulus) { 598 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n"); 599 ctx->tx_remainder = 0; 600 } 601 602 /* adjust TX-remainder according to NCM specification. */ 603 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) & 604 (ctx->tx_modulus - 1)); 605} 606 607static int cdc_ncm_setup(struct usbnet *dev) 608{ 609 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 610 u32 def_rx, def_tx; 611 612 /* be conservative when selecting intial buffer size to 613 * increase the number of hosts this will work for 614 */ 615 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX, 616 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 617 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX, 618 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 619 620 /* clamp rx_max and tx_max and inform device */ 621 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx); 622 623 /* sanitize the modulus and remainder values */ 624 cdc_ncm_fix_modulus(dev); 625 626 /* set max datagram size */ 627 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev)); 628 return 0; 629} 630 631static void 632cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf) 633{ 634 struct usb_host_endpoint *e, *in = NULL, *out = NULL; 635 u8 ep; 636 637 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { 638 639 e = intf->cur_altsetting->endpoint + ep; 640 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 641 case USB_ENDPOINT_XFER_INT: 642 if (usb_endpoint_dir_in(&e->desc)) { 643 if (!dev->status) 644 dev->status = e; 645 } 646 break; 647 648 case USB_ENDPOINT_XFER_BULK: 649 if (usb_endpoint_dir_in(&e->desc)) { 650 if (!in) 651 in = e; 652 } else { 653 if (!out) 654 out = e; 655 } 656 break; 657 658 default: 659 break; 660 } 661 } 662 if (in && !dev->in) 663 dev->in = usb_rcvbulkpipe(dev->udev, 664 in->desc.bEndpointAddress & 665 USB_ENDPOINT_NUMBER_MASK); 666 if (out && !dev->out) 667 dev->out = usb_sndbulkpipe(dev->udev, 668 out->desc.bEndpointAddress & 669 USB_ENDPOINT_NUMBER_MASK); 670} 671 672static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) 673{ 674 if (ctx == NULL) 675 return; 676 677 if (ctx->tx_rem_skb != NULL) { 678 dev_kfree_skb_any(ctx->tx_rem_skb); 679 ctx->tx_rem_skb = NULL; 680 } 681 682 if (ctx->tx_curr_skb != NULL) { 683 dev_kfree_skb_any(ctx->tx_curr_skb); 684 ctx->tx_curr_skb = NULL; 685 } 686 687 kfree(ctx); 688} 689 690int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting) 691{ 692 const struct usb_cdc_union_desc *union_desc = NULL; 693 struct cdc_ncm_ctx *ctx; 694 struct usb_driver *driver; 695 u8 *buf; 696 int len; 697 int temp; 698 u8 iface_no; 699 700 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 701 if (!ctx) 702 return -ENOMEM; 703 704 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 705 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; 706 ctx->bh.data = (unsigned long)dev; 707 ctx->bh.func = cdc_ncm_txpath_bh; 708 atomic_set(&ctx->stop, 0); 709 spin_lock_init(&ctx->mtx); 710 711 /* store ctx pointer in device data field */ 712 dev->data[0] = (unsigned long)ctx; 713 714 /* only the control interface can be successfully probed */ 715 ctx->control = intf; 716 717 /* get some pointers */ 718 driver = driver_of(intf); 719 buf = intf->cur_altsetting->extra; 720 len = intf->cur_altsetting->extralen; 721 722 /* parse through descriptors associated with control interface */ 723 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { 724 725 if (buf[1] != USB_DT_CS_INTERFACE) 726 goto advance; 727 728 switch (buf[2]) { 729 case USB_CDC_UNION_TYPE: 730 if (buf[0] < sizeof(*union_desc)) 731 break; 732 733 union_desc = (const struct usb_cdc_union_desc *)buf; 734 /* the master must be the interface we are probing */ 735 if (intf->cur_altsetting->desc.bInterfaceNumber != 736 union_desc->bMasterInterface0) { 737 dev_dbg(&intf->dev, "bogus CDC Union\n"); 738 goto error; 739 } 740 ctx->data = usb_ifnum_to_if(dev->udev, 741 union_desc->bSlaveInterface0); 742 break; 743 744 case USB_CDC_ETHERNET_TYPE: 745 if (buf[0] < sizeof(*(ctx->ether_desc))) 746 break; 747 748 ctx->ether_desc = 749 (const struct usb_cdc_ether_desc *)buf; 750 break; 751 752 case USB_CDC_NCM_TYPE: 753 if (buf[0] < sizeof(*(ctx->func_desc))) 754 break; 755 756 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; 757 break; 758 759 case USB_CDC_MBIM_TYPE: 760 if (buf[0] < sizeof(*(ctx->mbim_desc))) 761 break; 762 763 ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf; 764 break; 765 766 case USB_CDC_MBIM_EXTENDED_TYPE: 767 if (buf[0] < sizeof(*(ctx->mbim_extended_desc))) 768 break; 769 770 ctx->mbim_extended_desc = 771 (const struct usb_cdc_mbim_extended_desc *)buf; 772 break; 773 774 default: 775 break; 776 } 777advance: 778 /* advance to next descriptor */ 779 temp = buf[0]; 780 buf += temp; 781 len -= temp; 782 } 783 784 /* some buggy devices have an IAD but no CDC Union */ 785 if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) { 786 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1); 787 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n"); 788 } 789 790 /* check if we got everything */ 791 if (!ctx->data) { 792 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n"); 793 goto error; 794 } 795 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) { 796 if (!ctx->mbim_desc) { 797 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n"); 798 goto error; 799 } 800 } else { 801 if (!ctx->ether_desc || !ctx->func_desc) { 802 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n"); 803 goto error; 804 } 805 } 806 807 /* claim data interface, if different from control */ 808 if (ctx->data != ctx->control) { 809 temp = usb_driver_claim_interface(driver, ctx->data, dev); 810 if (temp) { 811 dev_dbg(&intf->dev, "failed to claim data intf\n"); 812 goto error; 813 } 814 } 815 816 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; 817 818 /* reset data interface */ 819 temp = usb_set_interface(dev->udev, iface_no, 0); 820 if (temp) { 821 dev_dbg(&intf->dev, "set interface failed\n"); 822 goto error2; 823 } 824 825 /* initialize basic device settings */ 826 if (cdc_ncm_init(dev)) 827 goto error2; 828 829 /* configure data interface */ 830 temp = usb_set_interface(dev->udev, iface_no, data_altsetting); 831 if (temp) { 832 dev_dbg(&intf->dev, "set interface failed\n"); 833 goto error2; 834 } 835 836 cdc_ncm_find_endpoints(dev, ctx->data); 837 cdc_ncm_find_endpoints(dev, ctx->control); 838 if (!dev->in || !dev->out || !dev->status) { 839 dev_dbg(&intf->dev, "failed to collect endpoints\n"); 840 goto error2; 841 } 842 843 usb_set_intfdata(ctx->data, dev); 844 usb_set_intfdata(ctx->control, dev); 845 846 if (ctx->ether_desc) { 847 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); 848 if (temp) { 849 dev_dbg(&intf->dev, "failed to get mac address\n"); 850 goto error2; 851 } 852 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr); 853 } 854 855 /* finish setting up the device specific data */ 856 cdc_ncm_setup(dev); 857 858 /* override ethtool_ops */ 859 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; 860 861 /* add our sysfs attrs */ 862 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group; 863 864 return 0; 865 866error2: 867 usb_set_intfdata(ctx->control, NULL); 868 usb_set_intfdata(ctx->data, NULL); 869 if (ctx->data != ctx->control) 870 usb_driver_release_interface(driver, ctx->data); 871error: 872 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); 873 dev->data[0] = 0; 874 dev_info(&intf->dev, "bind() failure\n"); 875 return -ENODEV; 876} 877EXPORT_SYMBOL_GPL(cdc_ncm_bind_common); 878 879void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) 880{ 881 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 882 struct usb_driver *driver = driver_of(intf); 883 884 if (ctx == NULL) 885 return; /* no setup */ 886 887 atomic_set(&ctx->stop, 1); 888 889 if (hrtimer_active(&ctx->tx_timer)) 890 hrtimer_cancel(&ctx->tx_timer); 891 892 tasklet_kill(&ctx->bh); 893 894 /* handle devices with combined control and data interface */ 895 if (ctx->control == ctx->data) 896 ctx->data = NULL; 897 898 /* disconnect master --> disconnect slave */ 899 if (intf == ctx->control && ctx->data) { 900 usb_set_intfdata(ctx->data, NULL); 901 usb_driver_release_interface(driver, ctx->data); 902 ctx->data = NULL; 903 904 } else if (intf == ctx->data && ctx->control) { 905 usb_set_intfdata(ctx->control, NULL); 906 usb_driver_release_interface(driver, ctx->control); 907 ctx->control = NULL; 908 } 909 910 usb_set_intfdata(intf, NULL); 911 cdc_ncm_free(ctx); 912} 913EXPORT_SYMBOL_GPL(cdc_ncm_unbind); 914 915/* Return the number of the MBIM control interface altsetting iff it 916 * is preferred and available, 917 */ 918u8 cdc_ncm_select_altsetting(struct usb_interface *intf) 919{ 920 struct usb_host_interface *alt; 921 922 /* The MBIM spec defines a NCM compatible default altsetting, 923 * which we may have matched: 924 * 925 * "Functions that implement both NCM 1.0 and MBIM (an 926 * “NCM/MBIM function”) according to this recommendation 927 * shall provide two alternate settings for the 928 * Communication Interface. Alternate setting 0, and the 929 * associated class and endpoint descriptors, shall be 930 * constructed according to the rules given for the 931 * Communication Interface in section 5 of [USBNCM10]. 932 * Alternate setting 1, and the associated class and 933 * endpoint descriptors, shall be constructed according to 934 * the rules given in section 6 (USB Device Model) of this 935 * specification." 936 */ 937 if (intf->num_altsetting < 2) 938 return intf->cur_altsetting->desc.bAlternateSetting; 939 940 if (prefer_mbim) { 941 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM); 942 if (alt && cdc_ncm_comm_intf_is_mbim(alt)) 943 return CDC_NCM_COMM_ALTSETTING_MBIM; 944 } 945 return CDC_NCM_COMM_ALTSETTING_NCM; 946} 947EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting); 948 949static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) 950{ 951 int ret; 952 953 /* MBIM backwards compatible function? */ 954 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM) 955 return -ENODEV; 956 957 /* The NCM data altsetting is fixed */ 958 ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM); 959 960 /* 961 * We should get an event when network connection is "connected" or 962 * "disconnected". Set network connection in "disconnected" state 963 * (carrier is OFF) during attach, so the IP network stack does not 964 * start IPv6 negotiation and more. 965 */ 966 usbnet_link_change(dev, 0, 0); 967 return ret; 968} 969 970static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max) 971{ 972 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder; 973 974 if (skb->len + align > max) 975 align = max - skb->len; 976 if (align && skb_tailroom(skb) >= align) 977 memset(skb_put(skb, align), 0, align); 978} 979 980/* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly 981 * allocating a new one within skb 982 */ 983static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) 984{ 985 struct usb_cdc_ncm_ndp16 *ndp16 = NULL; 986 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data; 987 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex); 988 989 /* follow the chain of NDPs, looking for a match */ 990 while (ndpoffset) { 991 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset); 992 if (ndp16->dwSignature == sign) 993 return ndp16; 994 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 995 } 996 997 /* align new NDP */ 998 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max); 999 1000 /* verify that there is room for the NDP and the datagram (reserve) */ 1001 if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size) 1002 return NULL; 1003 1004 /* link to it */ 1005 if (ndp16) 1006 ndp16->wNextNdpIndex = cpu_to_le16(skb->len); 1007 else 1008 nth16->wNdpIndex = cpu_to_le16(skb->len); 1009 1010 /* push a new empty NDP */ 1011 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size); 1012 ndp16->dwSignature = sign; 1013 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16)); 1014 return ndp16; 1015} 1016 1017struct sk_buff * 1018cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign) 1019{ 1020 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1021 struct usb_cdc_ncm_nth16 *nth16; 1022 struct usb_cdc_ncm_ndp16 *ndp16; 1023 struct sk_buff *skb_out; 1024 u16 n = 0, index, ndplen; 1025 u8 ready2send = 0; 1026 1027 /* if there is a remaining skb, it gets priority */ 1028 if (skb != NULL) { 1029 swap(skb, ctx->tx_rem_skb); 1030 swap(sign, ctx->tx_rem_sign); 1031 } else { 1032 ready2send = 1; 1033 } 1034 1035 /* check if we are resuming an OUT skb */ 1036 skb_out = ctx->tx_curr_skb; 1037 1038 /* allocate a new OUT skb */ 1039 if (!skb_out) { 1040 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC); 1041 if (skb_out == NULL) { 1042 if (skb != NULL) { 1043 dev_kfree_skb_any(skb); 1044 dev->net->stats.tx_dropped++; 1045 } 1046 goto exit_no_skb; 1047 } 1048 /* fill out the initial 16-bit NTB header */ 1049 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16)); 1050 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); 1051 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)); 1052 nth16->wSequence = cpu_to_le16(ctx->tx_seq++); 1053 1054 /* count total number of frames in this NTB */ 1055 ctx->tx_curr_frame_num = 0; 1056 1057 /* recent payload counter for this skb_out */ 1058 ctx->tx_curr_frame_payload = 0; 1059 } 1060 1061 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) { 1062 /* send any remaining skb first */ 1063 if (skb == NULL) { 1064 skb = ctx->tx_rem_skb; 1065 sign = ctx->tx_rem_sign; 1066 ctx->tx_rem_skb = NULL; 1067 1068 /* check for end of skb */ 1069 if (skb == NULL) 1070 break; 1071 } 1072 1073 /* get the appropriate NDP for this skb */ 1074 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); 1075 1076 /* align beginning of next frame */ 1077 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max); 1078 1079 /* check if we had enough room left for both NDP and frame */ 1080 if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) { 1081 if (n == 0) { 1082 /* won't fit, MTU problem? */ 1083 dev_kfree_skb_any(skb); 1084 skb = NULL; 1085 dev->net->stats.tx_dropped++; 1086 } else { 1087 /* no room for skb - store for later */ 1088 if (ctx->tx_rem_skb != NULL) { 1089 dev_kfree_skb_any(ctx->tx_rem_skb); 1090 dev->net->stats.tx_dropped++; 1091 } 1092 ctx->tx_rem_skb = skb; 1093 ctx->tx_rem_sign = sign; 1094 skb = NULL; 1095 ready2send = 1; 1096 ctx->tx_reason_ntb_full++; /* count reason for transmitting */ 1097 } 1098 break; 1099 } 1100 1101 /* calculate frame number withing this NDP */ 1102 ndplen = le16_to_cpu(ndp16->wLength); 1103 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1; 1104 1105 /* OK, add this skb */ 1106 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len); 1107 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len); 1108 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16)); 1109 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len); 1110 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */ 1111 dev_kfree_skb_any(skb); 1112 skb = NULL; 1113 1114 /* send now if this NDP is full */ 1115 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) { 1116 ready2send = 1; 1117 ctx->tx_reason_ndp_full++; /* count reason for transmitting */ 1118 break; 1119 } 1120 } 1121 1122 /* free up any dangling skb */ 1123 if (skb != NULL) { 1124 dev_kfree_skb_any(skb); 1125 skb = NULL; 1126 dev->net->stats.tx_dropped++; 1127 } 1128 1129 ctx->tx_curr_frame_num = n; 1130 1131 if (n == 0) { 1132 /* wait for more frames */ 1133 /* push variables */ 1134 ctx->tx_curr_skb = skb_out; 1135 goto exit_no_skb; 1136 1137 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) { 1138 /* wait for more frames */ 1139 /* push variables */ 1140 ctx->tx_curr_skb = skb_out; 1141 /* set the pending count */ 1142 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) 1143 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; 1144 goto exit_no_skb; 1145 1146 } else { 1147 if (n == ctx->tx_max_datagrams) 1148 ctx->tx_reason_max_datagram++; /* count reason for transmitting */ 1149 /* frame goes out */ 1150 /* variables will be reset at next call */ 1151 } 1152 1153 /* If collected data size is less or equal ctx->min_tx_pkt 1154 * bytes, we send buffers as it is. If we get more data, it 1155 * would be more efficient for USB HS mobile device with DMA 1156 * engine to receive a full size NTB, than canceling DMA 1157 * transfer and receiving a short packet. 1158 * 1159 * This optimization support is pointless if we end up sending 1160 * a ZLP after full sized NTBs. 1161 */ 1162 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) && 1163 skb_out->len > ctx->min_tx_pkt) 1164 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0, 1165 ctx->tx_max - skb_out->len); 1166 else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0) 1167 *skb_put(skb_out, 1) = 0; /* force short packet */ 1168 1169 /* set final frame length */ 1170 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 1171 nth16->wBlockLength = cpu_to_le16(skb_out->len); 1172 1173 /* return skb */ 1174 ctx->tx_curr_skb = NULL; 1175 dev->net->stats.tx_packets += ctx->tx_curr_frame_num; 1176 1177 /* keep private stats: framing overhead and number of NTBs */ 1178 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload; 1179 ctx->tx_ntbs++; 1180 1181 /* usbnet has already counted all the framing overhead. 1182 * Adjust the stats so that the tx_bytes counter show real 1183 * payload data instead. 1184 */ 1185 dev->net->stats.tx_bytes -= skb_out->len - ctx->tx_curr_frame_payload; 1186 1187 return skb_out; 1188 1189exit_no_skb: 1190 /* Start timer, if there is a remaining non-empty skb */ 1191 if (ctx->tx_curr_skb != NULL && n > 0) 1192 cdc_ncm_tx_timeout_start(ctx); 1193 return NULL; 1194} 1195EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame); 1196 1197static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) 1198{ 1199 /* start timer, if not already started */ 1200 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) 1201 hrtimer_start(&ctx->tx_timer, 1202 ktime_set(0, ctx->timer_interval), 1203 HRTIMER_MODE_REL); 1204} 1205 1206static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) 1207{ 1208 struct cdc_ncm_ctx *ctx = 1209 container_of(timer, struct cdc_ncm_ctx, tx_timer); 1210 1211 if (!atomic_read(&ctx->stop)) 1212 tasklet_schedule(&ctx->bh); 1213 return HRTIMER_NORESTART; 1214} 1215 1216static void cdc_ncm_txpath_bh(unsigned long param) 1217{ 1218 struct usbnet *dev = (struct usbnet *)param; 1219 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1220 1221 spin_lock_bh(&ctx->mtx); 1222 if (ctx->tx_timer_pending != 0) { 1223 ctx->tx_timer_pending--; 1224 cdc_ncm_tx_timeout_start(ctx); 1225 spin_unlock_bh(&ctx->mtx); 1226 } else if (dev->net != NULL) { 1227 ctx->tx_reason_timeout++; /* count reason for transmitting */ 1228 spin_unlock_bh(&ctx->mtx); 1229 netif_tx_lock_bh(dev->net); 1230 usbnet_start_xmit(NULL, dev->net); 1231 netif_tx_unlock_bh(dev->net); 1232 } else { 1233 spin_unlock_bh(&ctx->mtx); 1234 } 1235} 1236 1237struct sk_buff * 1238cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) 1239{ 1240 struct sk_buff *skb_out; 1241 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1242 1243 /* 1244 * The Ethernet API we are using does not support transmitting 1245 * multiple Ethernet frames in a single call. This driver will 1246 * accumulate multiple Ethernet frames and send out a larger 1247 * USB frame when the USB buffer is full or when a single jiffies 1248 * timeout happens. 1249 */ 1250 if (ctx == NULL) 1251 goto error; 1252 1253 spin_lock_bh(&ctx->mtx); 1254 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)); 1255 spin_unlock_bh(&ctx->mtx); 1256 return skb_out; 1257 1258error: 1259 if (skb != NULL) 1260 dev_kfree_skb_any(skb); 1261 1262 return NULL; 1263} 1264EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup); 1265 1266/* verify NTB header and return offset of first NDP, or negative error */ 1267int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) 1268{ 1269 struct usbnet *dev = netdev_priv(skb_in->dev); 1270 struct usb_cdc_ncm_nth16 *nth16; 1271 int len; 1272 int ret = -EINVAL; 1273 1274 if (ctx == NULL) 1275 goto error; 1276 1277 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + 1278 sizeof(struct usb_cdc_ncm_ndp16))) { 1279 netif_dbg(dev, rx_err, dev->net, "frame too short\n"); 1280 goto error; 1281 } 1282 1283 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; 1284 1285 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) { 1286 netif_dbg(dev, rx_err, dev->net, 1287 "invalid NTH16 signature <%#010x>\n", 1288 le32_to_cpu(nth16->dwSignature)); 1289 goto error; 1290 } 1291 1292 len = le16_to_cpu(nth16->wBlockLength); 1293 if (len > ctx->rx_max) { 1294 netif_dbg(dev, rx_err, dev->net, 1295 "unsupported NTB block length %u/%u\n", len, 1296 ctx->rx_max); 1297 goto error; 1298 } 1299 1300 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && 1301 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && 1302 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { 1303 netif_dbg(dev, rx_err, dev->net, 1304 "sequence number glitch prev=%d curr=%d\n", 1305 ctx->rx_seq, le16_to_cpu(nth16->wSequence)); 1306 } 1307 ctx->rx_seq = le16_to_cpu(nth16->wSequence); 1308 1309 ret = le16_to_cpu(nth16->wNdpIndex); 1310error: 1311 return ret; 1312} 1313EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16); 1314 1315/* verify NDP header and return number of datagrams, or negative error */ 1316int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset) 1317{ 1318 struct usbnet *dev = netdev_priv(skb_in->dev); 1319 struct usb_cdc_ncm_ndp16 *ndp16; 1320 int ret = -EINVAL; 1321 1322 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { 1323 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n", 1324 ndpoffset); 1325 goto error; 1326 } 1327 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1328 1329 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { 1330 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n", 1331 le16_to_cpu(ndp16->wLength)); 1332 goto error; 1333 } 1334 1335 ret = ((le16_to_cpu(ndp16->wLength) - 1336 sizeof(struct usb_cdc_ncm_ndp16)) / 1337 sizeof(struct usb_cdc_ncm_dpe16)); 1338 ret--; /* we process NDP entries except for the last one */ 1339 1340 if ((sizeof(struct usb_cdc_ncm_ndp16) + 1341 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) { 1342 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret); 1343 ret = -EINVAL; 1344 } 1345 1346error: 1347 return ret; 1348} 1349EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16); 1350 1351int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) 1352{ 1353 struct sk_buff *skb; 1354 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1355 int len; 1356 int nframes; 1357 int x; 1358 int offset; 1359 struct usb_cdc_ncm_ndp16 *ndp16; 1360 struct usb_cdc_ncm_dpe16 *dpe16; 1361 int ndpoffset; 1362 int loopcount = 50; /* arbitrary max preventing infinite loop */ 1363 u32 payload = 0; 1364 1365 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); 1366 if (ndpoffset < 0) 1367 goto error; 1368 1369next_ndp: 1370 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); 1371 if (nframes < 0) 1372 goto error; 1373 1374 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1375 1376 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) { 1377 netif_dbg(dev, rx_err, dev->net, 1378 "invalid DPT16 signature <%#010x>\n", 1379 le32_to_cpu(ndp16->dwSignature)); 1380 goto err_ndp; 1381 } 1382 dpe16 = ndp16->dpe16; 1383 1384 for (x = 0; x < nframes; x++, dpe16++) { 1385 offset = le16_to_cpu(dpe16->wDatagramIndex); 1386 len = le16_to_cpu(dpe16->wDatagramLength); 1387 1388 /* 1389 * CDC NCM ch. 3.7 1390 * All entries after first NULL entry are to be ignored 1391 */ 1392 if ((offset == 0) || (len == 0)) { 1393 if (!x) 1394 goto err_ndp; /* empty NTB */ 1395 break; 1396 } 1397 1398 /* sanity checking */ 1399 if (((offset + len) > skb_in->len) || 1400 (len > ctx->rx_max) || (len < ETH_HLEN)) { 1401 netif_dbg(dev, rx_err, dev->net, 1402 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n", 1403 x, offset, len, skb_in); 1404 if (!x) 1405 goto err_ndp; 1406 break; 1407 1408 } else { 1409 /* create a fresh copy to reduce truesize */ 1410 skb = netdev_alloc_skb_ip_align(dev->net, len); 1411 if (!skb) 1412 goto error; 1413 memcpy(skb_put(skb, len), skb_in->data + offset, len); 1414 usbnet_skb_return(dev, skb); 1415 payload += len; /* count payload bytes in this NTB */ 1416 } 1417 } 1418err_ndp: 1419 /* are there more NDPs to process? */ 1420 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 1421 if (ndpoffset && loopcount--) 1422 goto next_ndp; 1423 1424 /* update stats */ 1425 ctx->rx_overhead += skb_in->len - payload; 1426 ctx->rx_ntbs++; 1427 1428 return 1; 1429error: 1430 return 0; 1431} 1432EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup); 1433 1434static void 1435cdc_ncm_speed_change(struct usbnet *dev, 1436 struct usb_cdc_speed_change *data) 1437{ 1438 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); 1439 uint32_t tx_speed = le32_to_cpu(data->ULBitRate); 1440 1441 /* 1442 * Currently the USB-NET API does not support reporting the actual 1443 * device speed. Do print it instead. 1444 */ 1445 if ((tx_speed > 1000000) && (rx_speed > 1000000)) { 1446 netif_info(dev, link, dev->net, 1447 "%u mbit/s downlink %u mbit/s uplink\n", 1448 (unsigned int)(rx_speed / 1000000U), 1449 (unsigned int)(tx_speed / 1000000U)); 1450 } else { 1451 netif_info(dev, link, dev->net, 1452 "%u kbit/s downlink %u kbit/s uplink\n", 1453 (unsigned int)(rx_speed / 1000U), 1454 (unsigned int)(tx_speed / 1000U)); 1455 } 1456} 1457 1458static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) 1459{ 1460 struct cdc_ncm_ctx *ctx; 1461 struct usb_cdc_notification *event; 1462 1463 ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1464 1465 if (urb->actual_length < sizeof(*event)) 1466 return; 1467 1468 /* test for split data in 8-byte chunks */ 1469 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { 1470 cdc_ncm_speed_change(dev, 1471 (struct usb_cdc_speed_change *)urb->transfer_buffer); 1472 return; 1473 } 1474 1475 event = urb->transfer_buffer; 1476 1477 switch (event->bNotificationType) { 1478 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 1479 /* 1480 * According to the CDC NCM specification ch.7.1 1481 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be 1482 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. 1483 */ 1484 netif_info(dev, link, dev->net, 1485 "network connection: %sconnected\n", 1486 !!event->wValue ? "" : "dis"); 1487 usbnet_link_change(dev, !!event->wValue, 0); 1488 break; 1489 1490 case USB_CDC_NOTIFY_SPEED_CHANGE: 1491 if (urb->actual_length < (sizeof(*event) + 1492 sizeof(struct usb_cdc_speed_change))) 1493 set_bit(EVENT_STS_SPLIT, &dev->flags); 1494 else 1495 cdc_ncm_speed_change(dev, 1496 (struct usb_cdc_speed_change *)&event[1]); 1497 break; 1498 1499 default: 1500 dev_dbg(&dev->udev->dev, 1501 "NCM: unexpected notification 0x%02x!\n", 1502 event->bNotificationType); 1503 break; 1504 } 1505} 1506 1507static const struct driver_info cdc_ncm_info = { 1508 .description = "CDC NCM", 1509 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, 1510 .bind = cdc_ncm_bind, 1511 .unbind = cdc_ncm_unbind, 1512 .manage_power = usbnet_manage_power, 1513 .status = cdc_ncm_status, 1514 .rx_fixup = cdc_ncm_rx_fixup, 1515 .tx_fixup = cdc_ncm_tx_fixup, 1516}; 1517 1518/* Same as cdc_ncm_info, but with FLAG_WWAN */ 1519static const struct driver_info wwan_info = { 1520 .description = "Mobile Broadband Network Device", 1521 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1522 | FLAG_WWAN, 1523 .bind = cdc_ncm_bind, 1524 .unbind = cdc_ncm_unbind, 1525 .manage_power = usbnet_manage_power, 1526 .status = cdc_ncm_status, 1527 .rx_fixup = cdc_ncm_rx_fixup, 1528 .tx_fixup = cdc_ncm_tx_fixup, 1529}; 1530 1531/* Same as wwan_info, but with FLAG_NOARP */ 1532static const struct driver_info wwan_noarp_info = { 1533 .description = "Mobile Broadband Network Device (NO ARP)", 1534 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1535 | FLAG_WWAN | FLAG_NOARP, 1536 .bind = cdc_ncm_bind, 1537 .unbind = cdc_ncm_unbind, 1538 .manage_power = usbnet_manage_power, 1539 .status = cdc_ncm_status, 1540 .rx_fixup = cdc_ncm_rx_fixup, 1541 .tx_fixup = cdc_ncm_tx_fixup, 1542}; 1543 1544static const struct usb_device_id cdc_devs[] = { 1545 /* Ericsson MBM devices like F5521gw */ 1546 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1547 | USB_DEVICE_ID_MATCH_VENDOR, 1548 .idVendor = 0x0bdb, 1549 .bInterfaceClass = USB_CLASS_COMM, 1550 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1551 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1552 .driver_info = (unsigned long) &wwan_info, 1553 }, 1554 1555 /* Dell branded MBM devices like DW5550 */ 1556 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1557 | USB_DEVICE_ID_MATCH_VENDOR, 1558 .idVendor = 0x413c, 1559 .bInterfaceClass = USB_CLASS_COMM, 1560 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1561 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1562 .driver_info = (unsigned long) &wwan_info, 1563 }, 1564 1565 /* Toshiba branded MBM devices */ 1566 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1567 | USB_DEVICE_ID_MATCH_VENDOR, 1568 .idVendor = 0x0930, 1569 .bInterfaceClass = USB_CLASS_COMM, 1570 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1571 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1572 .driver_info = (unsigned long) &wwan_info, 1573 }, 1574 1575 /* tag Huawei devices as wwan */ 1576 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 1577 USB_CLASS_COMM, 1578 USB_CDC_SUBCLASS_NCM, 1579 USB_CDC_PROTO_NONE), 1580 .driver_info = (unsigned long)&wwan_info, 1581 }, 1582 1583 /* Infineon(now Intel) HSPA Modem platform */ 1584 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443, 1585 USB_CLASS_COMM, 1586 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1587 .driver_info = (unsigned long)&wwan_noarp_info, 1588 }, 1589 1590 /* Generic CDC-NCM devices */ 1591 { USB_INTERFACE_INFO(USB_CLASS_COMM, 1592 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1593 .driver_info = (unsigned long)&cdc_ncm_info, 1594 }, 1595 { 1596 }, 1597}; 1598MODULE_DEVICE_TABLE(usb, cdc_devs); 1599 1600static struct usb_driver cdc_ncm_driver = { 1601 .name = "cdc_ncm", 1602 .id_table = cdc_devs, 1603 .probe = usbnet_probe, 1604 .disconnect = usbnet_disconnect, 1605 .suspend = usbnet_suspend, 1606 .resume = usbnet_resume, 1607 .reset_resume = usbnet_resume, 1608 .supports_autosuspend = 1, 1609 .disable_hub_initiated_lpm = 1, 1610}; 1611 1612module_usb_driver(cdc_ncm_driver); 1613 1614MODULE_AUTHOR("Hans Petter Selasky"); 1615MODULE_DESCRIPTION("USB CDC NCM host driver"); 1616MODULE_LICENSE("Dual BSD/GPL"); 1617