David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Net1080 based USB host-to-host cables |
| 3 | * Copyright (C) 2000-2005 by David Brownell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | // #define DEBUG // error path messages, extra info |
| 21 | // #define VERBOSE // more; success messages |
| 22 | |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 23 | #include <linux/module.h> |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 24 | #include <linux/init.h> |
| 25 | #include <linux/netdevice.h> |
| 26 | #include <linux/etherdevice.h> |
| 27 | #include <linux/ethtool.h> |
| 28 | #include <linux/workqueue.h> |
| 29 | #include <linux/mii.h> |
| 30 | #include <linux/usb.h> |
| 31 | |
| 32 | #include <asm/unaligned.h> |
| 33 | |
| 34 | #include "usbnet.h" |
| 35 | |
| 36 | |
| 37 | /* |
| 38 | * Netchip 1080 driver ... http://www.netchip.com |
| 39 | * (Sept 2004: End-of-life announcement has been sent.) |
| 40 | * Used in (some) LapLink cables |
| 41 | */ |
| 42 | |
| 43 | #define frame_errors data[1] |
| 44 | |
| 45 | /* |
| 46 | * NetChip framing of ethernet packets, supporting additional error |
| 47 | * checks for links that may drop bulk packets from inside messages. |
| 48 | * Odd USB length == always short read for last usb packet. |
| 49 | * - nc_header |
| 50 | * - Ethernet header (14 bytes) |
| 51 | * - payload |
| 52 | * - (optional padding byte, if needed so length becomes odd) |
| 53 | * - nc_trailer |
| 54 | * |
| 55 | * This framing is to be avoided for non-NetChip devices. |
| 56 | */ |
| 57 | |
| 58 | struct nc_header { // packed: |
| 59 | __le16 hdr_len; // sizeof nc_header (LE, all) |
| 60 | __le16 packet_len; // payload size (including ethhdr) |
| 61 | __le16 packet_id; // detects dropped packets |
| 62 | #define MIN_HEADER 6 |
| 63 | |
| 64 | // all else is optional, and must start with: |
| 65 | // __le16 vendorId; // from usb-if |
| 66 | // __le16 productId; |
| 67 | } __attribute__((__packed__)); |
| 68 | |
| 69 | #define PAD_BYTE ((unsigned char)0xAC) |
| 70 | |
| 71 | struct nc_trailer { |
| 72 | __le16 packet_id; |
| 73 | } __attribute__((__packed__)); |
| 74 | |
| 75 | // packets may use FLAG_FRAMING_NC and optional pad |
| 76 | #define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \ |
| 77 | + sizeof (struct ethhdr) \ |
| 78 | + (mtu) \ |
| 79 | + 1 \ |
| 80 | + sizeof (struct nc_trailer)) |
| 81 | |
| 82 | #define MIN_FRAMED FRAMED_SIZE(0) |
| 83 | |
| 84 | /* packets _could_ be up to 64KB... */ |
| 85 | #define NC_MAX_PACKET 32767 |
| 86 | |
| 87 | |
| 88 | /* |
| 89 | * Zero means no timeout; else, how long a 64 byte bulk packet may be queued |
| 90 | * before the hardware drops it. If that's done, the driver will need to |
| 91 | * frame network packets to guard against the dropped USB packets. The win32 |
| 92 | * driver sets this for both sides of the link. |
| 93 | */ |
| 94 | #define NC_READ_TTL_MS ((u8)255) // ms |
| 95 | |
| 96 | /* |
| 97 | * We ignore most registers and EEPROM contents. |
| 98 | */ |
| 99 | #define REG_USBCTL ((u8)0x04) |
| 100 | #define REG_TTL ((u8)0x10) |
| 101 | #define REG_STATUS ((u8)0x11) |
| 102 | |
| 103 | /* |
| 104 | * Vendor specific requests to read/write data |
| 105 | */ |
| 106 | #define REQUEST_REGISTER ((u8)0x10) |
| 107 | #define REQUEST_EEPROM ((u8)0x11) |
| 108 | |
| 109 | static int |
| 110 | nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr) |
| 111 | { |
| 112 | int status = usb_control_msg(dev->udev, |
| 113 | usb_rcvctrlpipe(dev->udev, 0), |
| 114 | req, |
| 115 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
| 116 | 0, regnum, |
| 117 | retval_ptr, sizeof *retval_ptr, |
| 118 | USB_CTRL_GET_TIMEOUT); |
| 119 | if (status > 0) |
| 120 | status = 0; |
| 121 | if (!status) |
| 122 | le16_to_cpus(retval_ptr); |
| 123 | return status; |
| 124 | } |
| 125 | |
| 126 | static inline int |
| 127 | nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr) |
| 128 | { |
| 129 | return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr); |
| 130 | } |
| 131 | |
| 132 | // no retval ... can become async, usable in_interrupt() |
| 133 | static void |
| 134 | nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value) |
| 135 | { |
| 136 | usb_control_msg(dev->udev, |
| 137 | usb_sndctrlpipe(dev->udev, 0), |
| 138 | req, |
| 139 | USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
| 140 | value, regnum, |
| 141 | NULL, 0, // data is in setup packet |
| 142 | USB_CTRL_SET_TIMEOUT); |
| 143 | } |
| 144 | |
| 145 | static inline void |
| 146 | nc_register_write(struct usbnet *dev, u8 regnum, u16 value) |
| 147 | { |
| 148 | nc_vendor_write(dev, REQUEST_REGISTER, regnum, value); |
| 149 | } |
| 150 | |
| 151 | |
| 152 | #if 0 |
| 153 | static void nc_dump_registers(struct usbnet *dev) |
| 154 | { |
| 155 | u8 reg; |
| 156 | u16 *vp = kmalloc(sizeof (u16)); |
| 157 | |
| 158 | if (!vp) { |
| 159 | dbg("no memory?"); |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | dbg("%s registers:", dev->net->name); |
| 164 | for (reg = 0; reg < 0x20; reg++) { |
| 165 | int retval; |
| 166 | |
| 167 | // reading some registers is trouble |
| 168 | if (reg >= 0x08 && reg <= 0xf) |
| 169 | continue; |
| 170 | if (reg >= 0x12 && reg <= 0x1e) |
| 171 | continue; |
| 172 | |
| 173 | retval = nc_register_read(dev, reg, vp); |
| 174 | if (retval < 0) |
| 175 | dbg("%s reg [0x%x] ==> error %d", |
| 176 | dev->net->name, reg, retval); |
| 177 | else |
| 178 | dbg("%s reg [0x%x] = 0x%x", |
| 179 | dev->net->name, reg, *vp); |
| 180 | } |
| 181 | kfree(vp); |
| 182 | } |
| 183 | #endif |
| 184 | |
| 185 | |
| 186 | /*-------------------------------------------------------------------------*/ |
| 187 | |
| 188 | /* |
| 189 | * Control register |
| 190 | */ |
| 191 | |
| 192 | #define USBCTL_WRITABLE_MASK 0x1f0f |
| 193 | // bits 15-13 reserved, r/o |
| 194 | #define USBCTL_ENABLE_LANG (1 << 12) |
| 195 | #define USBCTL_ENABLE_MFGR (1 << 11) |
| 196 | #define USBCTL_ENABLE_PROD (1 << 10) |
| 197 | #define USBCTL_ENABLE_SERIAL (1 << 9) |
| 198 | #define USBCTL_ENABLE_DEFAULTS (1 << 8) |
| 199 | // bits 7-4 reserved, r/o |
| 200 | #define USBCTL_FLUSH_OTHER (1 << 3) |
| 201 | #define USBCTL_FLUSH_THIS (1 << 2) |
| 202 | #define USBCTL_DISCONN_OTHER (1 << 1) |
| 203 | #define USBCTL_DISCONN_THIS (1 << 0) |
| 204 | |
| 205 | static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl) |
| 206 | { |
| 207 | if (!netif_msg_link(dev)) |
| 208 | return; |
| 209 | devdbg(dev, "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s;" |
| 210 | " this%s%s;" |
| 211 | " other%s%s; r/o 0x%x", |
| 212 | dev->udev->bus->bus_name, dev->udev->devpath, |
| 213 | usbctl, |
| 214 | (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "", |
| 215 | (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "", |
| 216 | (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "", |
| 217 | (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "", |
| 218 | (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "", |
| 219 | |
| 220 | (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "", |
| 221 | (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "", |
| 222 | (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "", |
| 223 | (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "", |
| 224 | usbctl & ~USBCTL_WRITABLE_MASK |
| 225 | ); |
| 226 | } |
| 227 | |
| 228 | /*-------------------------------------------------------------------------*/ |
| 229 | |
| 230 | /* |
| 231 | * Status register |
| 232 | */ |
| 233 | |
| 234 | #define STATUS_PORT_A (1 << 15) |
| 235 | |
| 236 | #define STATUS_CONN_OTHER (1 << 14) |
| 237 | #define STATUS_SUSPEND_OTHER (1 << 13) |
| 238 | #define STATUS_MAILBOX_OTHER (1 << 12) |
Jean Delvare | b4ee4a2 | 2006-11-09 22:02:37 +0100 | [diff] [blame] | 239 | #define STATUS_PACKETS_OTHER(n) (((n) >> 8) & 0x03) |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 240 | |
| 241 | #define STATUS_CONN_THIS (1 << 6) |
| 242 | #define STATUS_SUSPEND_THIS (1 << 5) |
| 243 | #define STATUS_MAILBOX_THIS (1 << 4) |
Jean Delvare | b4ee4a2 | 2006-11-09 22:02:37 +0100 | [diff] [blame] | 244 | #define STATUS_PACKETS_THIS(n) (((n) >> 0) & 0x03) |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 245 | |
| 246 | #define STATUS_UNSPEC_MASK 0x0c8c |
| 247 | #define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK)) |
| 248 | |
| 249 | |
| 250 | static inline void nc_dump_status(struct usbnet *dev, u16 status) |
| 251 | { |
| 252 | if (!netif_msg_link(dev)) |
| 253 | return; |
| 254 | devdbg(dev, "net1080 %s-%s status 0x%x:" |
| 255 | " this (%c) PKT=%d%s%s%s;" |
| 256 | " other PKT=%d%s%s%s; unspec 0x%x", |
| 257 | dev->udev->bus->bus_name, dev->udev->devpath, |
| 258 | status, |
| 259 | |
| 260 | // XXX the packet counts don't seem right |
| 261 | // (1 at reset, not 0); maybe UNSPEC too |
| 262 | |
| 263 | (status & STATUS_PORT_A) ? 'A' : 'B', |
| 264 | STATUS_PACKETS_THIS(status), |
| 265 | (status & STATUS_CONN_THIS) ? " CON" : "", |
| 266 | (status & STATUS_SUSPEND_THIS) ? " SUS" : "", |
| 267 | (status & STATUS_MAILBOX_THIS) ? " MBOX" : "", |
| 268 | |
| 269 | STATUS_PACKETS_OTHER(status), |
| 270 | (status & STATUS_CONN_OTHER) ? " CON" : "", |
| 271 | (status & STATUS_SUSPEND_OTHER) ? " SUS" : "", |
| 272 | (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "", |
| 273 | |
| 274 | status & STATUS_UNSPEC_MASK |
| 275 | ); |
| 276 | } |
| 277 | |
| 278 | /*-------------------------------------------------------------------------*/ |
| 279 | |
| 280 | /* |
| 281 | * TTL register |
| 282 | */ |
| 283 | |
| 284 | #define TTL_THIS(ttl) (0x00ff & ttl) |
| 285 | #define TTL_OTHER(ttl) (0x00ff & (ttl >> 8)) |
| 286 | #define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this)))) |
| 287 | |
| 288 | static inline void nc_dump_ttl(struct usbnet *dev, u16 ttl) |
| 289 | { |
| 290 | if (netif_msg_link(dev)) |
| 291 | devdbg(dev, "net1080 %s-%s ttl 0x%x this = %d, other = %d", |
| 292 | dev->udev->bus->bus_name, dev->udev->devpath, |
| 293 | ttl, TTL_THIS(ttl), TTL_OTHER(ttl)); |
| 294 | } |
| 295 | |
| 296 | /*-------------------------------------------------------------------------*/ |
| 297 | |
| 298 | static int net1080_reset(struct usbnet *dev) |
| 299 | { |
| 300 | u16 usbctl, status, ttl; |
| 301 | u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL); |
| 302 | int retval; |
| 303 | |
| 304 | if (!vp) |
| 305 | return -ENOMEM; |
| 306 | |
| 307 | // nc_dump_registers(dev); |
| 308 | |
| 309 | if ((retval = nc_register_read(dev, REG_STATUS, vp)) < 0) { |
| 310 | dbg("can't read %s-%s status: %d", |
| 311 | dev->udev->bus->bus_name, dev->udev->devpath, retval); |
| 312 | goto done; |
| 313 | } |
| 314 | status = *vp; |
| 315 | nc_dump_status(dev, status); |
| 316 | |
| 317 | if ((retval = nc_register_read(dev, REG_USBCTL, vp)) < 0) { |
| 318 | dbg("can't read USBCTL, %d", retval); |
| 319 | goto done; |
| 320 | } |
| 321 | usbctl = *vp; |
| 322 | nc_dump_usbctl(dev, usbctl); |
| 323 | |
| 324 | nc_register_write(dev, REG_USBCTL, |
| 325 | USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER); |
| 326 | |
| 327 | if ((retval = nc_register_read(dev, REG_TTL, vp)) < 0) { |
| 328 | dbg("can't read TTL, %d", retval); |
| 329 | goto done; |
| 330 | } |
| 331 | ttl = *vp; |
| 332 | // nc_dump_ttl(dev, ttl); |
| 333 | |
| 334 | nc_register_write(dev, REG_TTL, |
| 335 | MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) ); |
| 336 | dbg("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS); |
| 337 | |
| 338 | if (netif_msg_link(dev)) |
| 339 | devinfo(dev, "port %c, peer %sconnected", |
| 340 | (status & STATUS_PORT_A) ? 'A' : 'B', |
| 341 | (status & STATUS_CONN_OTHER) ? "" : "dis" |
| 342 | ); |
| 343 | retval = 0; |
| 344 | |
| 345 | done: |
| 346 | kfree(vp); |
| 347 | return retval; |
| 348 | } |
| 349 | |
| 350 | static int net1080_check_connect(struct usbnet *dev) |
| 351 | { |
| 352 | int retval; |
| 353 | u16 status; |
| 354 | u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL); |
| 355 | |
| 356 | if (!vp) |
| 357 | return -ENOMEM; |
| 358 | retval = nc_register_read(dev, REG_STATUS, vp); |
| 359 | status = *vp; |
| 360 | kfree(vp); |
| 361 | if (retval != 0) { |
| 362 | dbg("%s net1080_check_conn read - %d", dev->net->name, retval); |
| 363 | return retval; |
| 364 | } |
| 365 | if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER) |
| 366 | return -ENOLINK; |
| 367 | return 0; |
| 368 | } |
| 369 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 370 | static void nc_flush_complete(struct urb *urb) |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 371 | { |
| 372 | kfree(urb->context); |
| 373 | usb_free_urb(urb); |
| 374 | } |
| 375 | |
| 376 | static void nc_ensure_sync(struct usbnet *dev) |
| 377 | { |
| 378 | dev->frame_errors++; |
| 379 | if (dev->frame_errors > 5) { |
| 380 | struct urb *urb; |
| 381 | struct usb_ctrlrequest *req; |
| 382 | int status; |
| 383 | |
| 384 | /* Send a flush */ |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 385 | urb = usb_alloc_urb(0, GFP_ATOMIC); |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 386 | if (!urb) |
| 387 | return; |
| 388 | |
| 389 | req = kmalloc(sizeof *req, GFP_ATOMIC); |
| 390 | if (!req) { |
| 391 | usb_free_urb(urb); |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | req->bRequestType = USB_DIR_OUT |
| 396 | | USB_TYPE_VENDOR |
| 397 | | USB_RECIP_DEVICE; |
| 398 | req->bRequest = REQUEST_REGISTER; |
| 399 | req->wValue = cpu_to_le16(USBCTL_FLUSH_THIS |
| 400 | | USBCTL_FLUSH_OTHER); |
| 401 | req->wIndex = cpu_to_le16(REG_USBCTL); |
| 402 | req->wLength = cpu_to_le16(0); |
| 403 | |
| 404 | /* queue an async control request, we don't need |
| 405 | * to do anything when it finishes except clean up. |
| 406 | */ |
| 407 | usb_fill_control_urb(urb, dev->udev, |
| 408 | usb_sndctrlpipe(dev->udev, 0), |
| 409 | (unsigned char *) req, |
| 410 | NULL, 0, |
| 411 | nc_flush_complete, req); |
| 412 | status = usb_submit_urb(urb, GFP_ATOMIC); |
| 413 | if (status) { |
| 414 | kfree(req); |
| 415 | usb_free_urb(urb); |
| 416 | return; |
| 417 | } |
| 418 | |
| 419 | if (netif_msg_rx_err(dev)) |
| 420 | devdbg(dev, "flush net1080; too many framing errors"); |
| 421 | dev->frame_errors = 0; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb) |
| 426 | { |
| 427 | struct nc_header *header; |
| 428 | struct nc_trailer *trailer; |
| 429 | u16 hdr_len, packet_len; |
| 430 | |
| 431 | if (!(skb->len & 0x01)) { |
| 432 | #ifdef DEBUG |
| 433 | struct net_device *net = dev->net; |
| 434 | dbg("rx framesize %d range %d..%d mtu %d", skb->len, |
| 435 | net->hard_header_len, dev->hard_mtu, net->mtu); |
| 436 | #endif |
| 437 | dev->stats.rx_frame_errors++; |
| 438 | nc_ensure_sync(dev); |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | header = (struct nc_header *) skb->data; |
| 443 | hdr_len = le16_to_cpup(&header->hdr_len); |
| 444 | packet_len = le16_to_cpup(&header->packet_len); |
| 445 | if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) { |
| 446 | dev->stats.rx_frame_errors++; |
| 447 | dbg("packet too big, %d", packet_len); |
| 448 | nc_ensure_sync(dev); |
| 449 | return 0; |
| 450 | } else if (hdr_len < MIN_HEADER) { |
| 451 | dev->stats.rx_frame_errors++; |
| 452 | dbg("header too short, %d", hdr_len); |
| 453 | nc_ensure_sync(dev); |
| 454 | return 0; |
| 455 | } else if (hdr_len > MIN_HEADER) { |
| 456 | // out of band data for us? |
| 457 | dbg("header OOB, %d bytes", hdr_len - MIN_HEADER); |
| 458 | nc_ensure_sync(dev); |
| 459 | // switch (vendor/product ids) { ... } |
| 460 | } |
| 461 | skb_pull(skb, hdr_len); |
| 462 | |
| 463 | trailer = (struct nc_trailer *) |
| 464 | (skb->data + skb->len - sizeof *trailer); |
| 465 | skb_trim(skb, skb->len - sizeof *trailer); |
| 466 | |
| 467 | if ((packet_len & 0x01) == 0) { |
| 468 | if (skb->data [packet_len] != PAD_BYTE) { |
| 469 | dev->stats.rx_frame_errors++; |
| 470 | dbg("bad pad"); |
| 471 | return 0; |
| 472 | } |
| 473 | skb_trim(skb, skb->len - 1); |
| 474 | } |
| 475 | if (skb->len != packet_len) { |
| 476 | dev->stats.rx_frame_errors++; |
| 477 | dbg("bad packet len %d (expected %d)", |
| 478 | skb->len, packet_len); |
| 479 | nc_ensure_sync(dev); |
| 480 | return 0; |
| 481 | } |
| 482 | if (header->packet_id != get_unaligned(&trailer->packet_id)) { |
| 483 | dev->stats.rx_fifo_errors++; |
| 484 | dbg("(2+ dropped) rx packet_id mismatch 0x%x 0x%x", |
| 485 | le16_to_cpu(header->packet_id), |
| 486 | le16_to_cpu(trailer->packet_id)); |
| 487 | return 0; |
| 488 | } |
| 489 | #if 0 |
| 490 | devdbg(dev, "frame <rx h %d p %d id %d", header->hdr_len, |
| 491 | header->packet_len, header->packet_id); |
| 492 | #endif |
| 493 | dev->frame_errors = 0; |
| 494 | return 1; |
| 495 | } |
| 496 | |
| 497 | static struct sk_buff * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 498 | net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 499 | { |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 500 | struct sk_buff *skb2; |
| 501 | struct nc_header *header = NULL; |
| 502 | struct nc_trailer *trailer = NULL; |
dave rientjes | 9bcbcf4 | 2006-07-18 23:23:02 -0700 | [diff] [blame] | 503 | int padlen = sizeof (struct nc_trailer); |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 504 | int len = skb->len; |
| 505 | |
dave rientjes | 9bcbcf4 | 2006-07-18 23:23:02 -0700 | [diff] [blame] | 506 | if (!((len + padlen + sizeof (struct nc_header)) & 0x01)) |
| 507 | padlen++; |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 508 | if (!skb_cloned(skb)) { |
| 509 | int headroom = skb_headroom(skb); |
| 510 | int tailroom = skb_tailroom(skb); |
| 511 | |
dave rientjes | 9bcbcf4 | 2006-07-18 23:23:02 -0700 | [diff] [blame] | 512 | if (padlen <= tailroom && |
| 513 | sizeof(struct nc_header) <= headroom) |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 514 | /* There's enough head and tail room */ |
| 515 | goto encapsulate; |
| 516 | |
dave rientjes | 9bcbcf4 | 2006-07-18 23:23:02 -0700 | [diff] [blame] | 517 | if ((sizeof (struct nc_header) + padlen) < |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 518 | (headroom + tailroom)) { |
| 519 | /* There's enough total room, so just readjust */ |
| 520 | skb->data = memmove(skb->head |
| 521 | + sizeof (struct nc_header), |
| 522 | skb->data, skb->len); |
| 523 | skb->tail = skb->data + len; |
| 524 | goto encapsulate; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* Create a new skb to use with the correct size */ |
| 529 | skb2 = skb_copy_expand(skb, |
| 530 | sizeof (struct nc_header), |
dave rientjes | 9bcbcf4 | 2006-07-18 23:23:02 -0700 | [diff] [blame] | 531 | padlen, |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 532 | flags); |
| 533 | dev_kfree_skb_any(skb); |
| 534 | if (!skb2) |
| 535 | return skb2; |
| 536 | skb = skb2; |
| 537 | |
| 538 | encapsulate: |
| 539 | /* header first */ |
| 540 | header = (struct nc_header *) skb_push(skb, sizeof *header); |
| 541 | header->hdr_len = cpu_to_le16(sizeof (*header)); |
| 542 | header->packet_len = cpu_to_le16(len); |
| 543 | header->packet_id = cpu_to_le16((u16)dev->xid++); |
| 544 | |
| 545 | /* maybe pad; then trailer */ |
| 546 | if (!((skb->len + sizeof *trailer) & 0x01)) |
| 547 | *skb_put(skb, 1) = PAD_BYTE; |
| 548 | trailer = (struct nc_trailer *) skb_put(skb, sizeof *trailer); |
| 549 | put_unaligned(header->packet_id, &trailer->packet_id); |
| 550 | #if 0 |
| 551 | devdbg(dev, "frame >tx h %d p %d id %d", |
| 552 | header->hdr_len, header->packet_len, |
| 553 | header->packet_id); |
| 554 | #endif |
| 555 | return skb; |
| 556 | } |
| 557 | |
| 558 | static int net1080_bind(struct usbnet *dev, struct usb_interface *intf) |
| 559 | { |
| 560 | unsigned extra = sizeof (struct nc_header) |
| 561 | + 1 |
| 562 | + sizeof (struct nc_trailer); |
| 563 | |
| 564 | dev->net->hard_header_len += extra; |
| 565 | dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu; |
| 566 | dev->hard_mtu = NC_MAX_PACKET; |
| 567 | return usbnet_get_endpoints (dev, intf); |
| 568 | } |
| 569 | |
| 570 | static const struct driver_info net1080_info = { |
| 571 | .description = "NetChip TurboCONNECT", |
| 572 | .flags = FLAG_FRAMING_NC, |
| 573 | .bind = net1080_bind, |
| 574 | .reset = net1080_reset, |
| 575 | .check_connect = net1080_check_connect, |
| 576 | .rx_fixup = net1080_rx_fixup, |
| 577 | .tx_fixup = net1080_tx_fixup, |
| 578 | }; |
| 579 | |
| 580 | static const struct usb_device_id products [] = { |
| 581 | { |
| 582 | USB_DEVICE(0x0525, 0x1080), // NetChip ref design |
| 583 | .driver_info = (unsigned long) &net1080_info, |
| 584 | }, { |
| 585 | USB_DEVICE(0x06D0, 0x0622), // Laplink Gold |
| 586 | .driver_info = (unsigned long) &net1080_info, |
| 587 | }, |
| 588 | { }, // END |
| 589 | }; |
| 590 | MODULE_DEVICE_TABLE(usb, products); |
| 591 | |
| 592 | static struct usb_driver net1080_driver = { |
David Brownell | 904813c | 2005-08-31 09:53:26 -0700 | [diff] [blame] | 593 | .name = "net1080", |
| 594 | .id_table = products, |
| 595 | .probe = usbnet_probe, |
| 596 | .disconnect = usbnet_disconnect, |
| 597 | .suspend = usbnet_suspend, |
| 598 | .resume = usbnet_resume, |
| 599 | }; |
| 600 | |
| 601 | static int __init net1080_init(void) |
| 602 | { |
| 603 | return usb_register(&net1080_driver); |
| 604 | } |
| 605 | module_init(net1080_init); |
| 606 | |
| 607 | static void __exit net1080_exit(void) |
| 608 | { |
| 609 | usb_deregister(&net1080_driver); |
| 610 | } |
| 611 | module_exit(net1080_exit); |
| 612 | |
| 613 | MODULE_AUTHOR("David Brownell"); |
| 614 | MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links"); |
| 615 | MODULE_LICENSE("GPL"); |