drivers/net/usb/smsc95xx.c

   1  /***************************************************************************
   2  *
   3  * Copyright (C) 2007-2008 SMSC
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (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
  21 #include <linux/module.h>
  22 #include <linux/kmod.h>
  23 #include <linux/init.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/mii.h>
  28 #include <linux/usb.h>
  29 #include <linux/crc32.h>
  30 #include <linux/usb/usbnet.h>
  31 #include <linux/slab.h>
  32 #include "smsc95xx.h"
  33
  34 #define SMSC_CHIPNAME                   "smsc95xx"
  35 #define SMSC_DRIVER_VERSION             "1.0.4"
  36 #define HS_USB_PKT_SIZE                 (512)
  37 #define FS_USB_PKT_SIZE                 (64)
  38 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
  39 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
  40 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
  41 #define MAX_SINGLE_PACKET_SIZE          (2048)
  42 #define LAN95XX_EEPROM_MAGIC            (0x9500)
  43 #define EEPROM_MAC_OFFSET               (0x01)
  44 #define DEFAULT_TX_CSUM_ENABLE          (true)
  45 #define DEFAULT_RX_CSUM_ENABLE          (true)
  46 #define SMSC95XX_INTERNAL_PHY_ID        (1)
  47 #define SMSC95XX_TX_OVERHEAD            (8)
  48 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
  49
  50 struct smsc95xx_priv {
  51         u32 mac_cr;
  52         u32 hash_hi;
  53         u32 hash_lo;
  54         spinlock_t mac_cr_lock;
  55         bool use_tx_csum;
  56         bool use_rx_csum;
  57 };
  58
  59 struct usb_context {
  60         struct usb_ctrlrequest req;
  61         struct usbnet *dev;
  62 };
  63
  64 static int turbo_mode = true;
  65 module_param(turbo_mode, bool, 0644);
  66 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
  67
  68 static int smsc95xx_read_reg(struct usbnet *dev, u32 index, u32 *data)
  69 {
  70         u32 *buf = kmalloc(4, GFP_KERNEL);
  71         int ret;
  72
  73         BUG_ON(!dev);
  74
  75         if (!buf)
  76                 return -ENOMEM;
  77
  78         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
  79                 USB_VENDOR_REQUEST_READ_REGISTER,
  80                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  81                 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
  82
  83         if (unlikely(ret < 0))
  84                 netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index);
  85
  86         le32_to_cpus(buf);
  87         *data = *buf;
  88         kfree(buf);
  89
  90         return ret;
  91 }
  92
  93 static int smsc95xx_write_reg(struct usbnet *dev, u32 index, u32 data)
  94 {
  95         u32 *buf = kmalloc(4, GFP_KERNEL);
  96         int ret;
  97
  98         BUG_ON(!dev);
  99
 100         if (!buf)
 101                 return -ENOMEM;
 102
 103         *buf = data;
 104         cpu_to_le32s(buf);
 105
 106         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 107                 USB_VENDOR_REQUEST_WRITE_REGISTER,
 108                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 109                 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
 110
 111         if (unlikely(ret < 0))
 112                 netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index);
 113
 114         kfree(buf);
 115
 116         return ret;
 117 }
 118
 119 /* Loop until the read is completed with timeout
 120  * called with phy_mutex held */
 121 static int smsc95xx_phy_wait_not_busy(struct usbnet *dev)
 122 {
 123         unsigned long start_time = jiffies;
 124         u32 val;
 125
 126         do {
 127                 smsc95xx_read_reg(dev, MII_ADDR, &val);
 128                 if (!(val & MII_BUSY_))
 129                         return 0;
 130         } while (!time_after(jiffies, start_time + HZ));
 131
 132         return -EIO;
 133 }
 134
 135 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
 136 {
 137         struct usbnet *dev = netdev_priv(netdev);
 138         u32 val, addr;
 139
 140         mutex_lock(&dev->phy_mutex);
 141
 142         /* confirm MII not busy */
 143         if (smsc95xx_phy_wait_not_busy(dev)) {
 144                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
 145                 mutex_unlock(&dev->phy_mutex);
 146                 return -EIO;
 147         }
 148
 149         /* set the address, index & direction (read from PHY) */
 150         phy_id &= dev->mii.phy_id_mask;
 151         idx &= dev->mii.reg_num_mask;
 152         addr = (phy_id << 11) | (idx << 6) | MII_READ_;
 153         smsc95xx_write_reg(dev, MII_ADDR, addr);
 154
 155         if (smsc95xx_phy_wait_not_busy(dev)) {
 156                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
 157                 mutex_unlock(&dev->phy_mutex);
 158                 return -EIO;
 159         }
 160
 161         smsc95xx_read_reg(dev, MII_DATA, &val);
 162
 163         mutex_unlock(&dev->phy_mutex);
 164
 165         return (u16)(val & 0xFFFF);
 166 }
 167
 168 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
 169                                 int regval)
 170 {
 171         struct usbnet *dev = netdev_priv(netdev);
 172         u32 val, addr;
 173
 174         mutex_lock(&dev->phy_mutex);
 175
 176         /* confirm MII not busy */
 177         if (smsc95xx_phy_wait_not_busy(dev)) {
 178                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
 179                 mutex_unlock(&dev->phy_mutex);
 180                 return;
 181         }
 182
 183         val = regval;
 184         smsc95xx_write_reg(dev, MII_DATA, val);
 185
 186         /* set the address, index & direction (write to PHY) */
 187         phy_id &= dev->mii.phy_id_mask;
 188         idx &= dev->mii.reg_num_mask;
 189         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_;
 190         smsc95xx_write_reg(dev, MII_ADDR, addr);
 191
 192         if (smsc95xx_phy_wait_not_busy(dev))
 193                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
 194
 195         mutex_unlock(&dev->phy_mutex);
 196 }
 197
 198 static int smsc95xx_wait_eeprom(struct usbnet *dev)
 199 {
 200         unsigned long start_time = jiffies;
 201         u32 val;
 202
 203         do {
 204                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 205                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
 206                         break;
 207                 udelay(40);
 208         } while (!time_after(jiffies, start_time + HZ));
 209
 210         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
 211                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
 212                 return -EIO;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
 219 {
 220         unsigned long start_time = jiffies;
 221         u32 val;
 222
 223         do {
 224                 smsc95xx_read_reg(dev, E2P_CMD, &val);
 225
 226                 if (!(val & E2P_CMD_BUSY_))
 227                         return 0;
 228
 229                 udelay(40);
 230         } while (!time_after(jiffies, start_time + HZ));
 231
 232         netdev_warn(dev->net, "EEPROM is busy\n");
 233         return -EIO;
 234 }
 235
 236 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
 237                                 u8 *data)
 238 {
 239         u32 val;
 240         int i, ret;
 241
 242         BUG_ON(!dev);
 243         BUG_ON(!data);
 244
 245         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 246         if (ret)
 247                 return ret;
 248
 249         for (i = 0; i < length; i++) {
 250                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
 251                 smsc95xx_write_reg(dev, E2P_CMD, val);
 252
 253                 ret = smsc95xx_wait_eeprom(dev);
 254                 if (ret < 0)
 255                         return ret;
 256
 257                 smsc95xx_read_reg(dev, E2P_DATA, &val);
 258
 259                 data[i] = val & 0xFF;
 260                 offset++;
 261         }
 262
 263         return 0;
 264 }
 265
 266 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
 267                                  u8 *data)
 268 {
 269         u32 val;
 270         int i, ret;
 271
 272         BUG_ON(!dev);
 273         BUG_ON(!data);
 274
 275         ret = smsc95xx_eeprom_confirm_not_busy(dev);
 276         if (ret)
 277                 return ret;
 278
 279         /* Issue write/erase enable command */
 280         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
 281         smsc95xx_write_reg(dev, E2P_CMD, val);
 282
 283         ret = smsc95xx_wait_eeprom(dev);
 284         if (ret < 0)
 285                 return ret;
 286
 287         for (i = 0; i < length; i++) {
 288
 289                 /* Fill data register */
 290                 val = data[i];
 291                 smsc95xx_write_reg(dev, E2P_DATA, val);
 292
 293                 /* Send "write" command */
 294                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
 295                 smsc95xx_write_reg(dev, E2P_CMD, val);
 296
 297                 ret = smsc95xx_wait_eeprom(dev);
 298                 if (ret < 0)
 299                         return ret;
 300
 301                 offset++;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static void smsc95xx_async_cmd_callback(struct urb *urb)
 308 {
 309         struct usb_context *usb_context = urb->context;
 310         struct usbnet *dev = usb_context->dev;
 311         int status = urb->status;
 312
 313         if (status < 0)
 314                 netdev_warn(dev->net, "async callback failed with %d\n", status);
 315
 316         kfree(usb_context);
 317         usb_free_urb(urb);
 318 }
 319
 320 static int smsc95xx_write_reg_async(struct usbnet *dev, u16 index, u32 *data)
 321 {
 322         struct usb_context *usb_context;
 323         int status;
 324         struct urb *urb;
 325         const u16 size = 4;
 326
 327         urb = usb_alloc_urb(0, GFP_ATOMIC);
 328         if (!urb) {
 329                 netdev_warn(dev->net, "Error allocating URB\n");
 330                 return -ENOMEM;
 331         }
 332
 333         usb_context = kmalloc(sizeof(struct usb_context), GFP_ATOMIC);
 334         if (usb_context == NULL) {
 335                 netdev_warn(dev->net, "Error allocating control msg\n");
 336                 usb_free_urb(urb);
 337                 return -ENOMEM;
 338         }
 339
 340         usb_context->req.bRequestType =
 341                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
 342         usb_context->req.bRequest = USB_VENDOR_REQUEST_WRITE_REGISTER;
 343         usb_context->req.wValue = 00;
 344         usb_context->req.wIndex = cpu_to_le16(index);
 345         usb_context->req.wLength = cpu_to_le16(size);
 346
 347         usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0),
 348                 (void *)&usb_context->req, data, size,
 349                 smsc95xx_async_cmd_callback,
 350                 (void *)usb_context);
 351
 352         status = usb_submit_urb(urb, GFP_ATOMIC);
 353         if (status < 0) {
 354                 netdev_warn(dev->net, "Error submitting control msg, sts=%d\n",
 355                             status);
 356                 kfree(usb_context);
 357                 usb_free_urb(urb);
 358         }
 359
 360         return status;
 361 }
 362
 363 /* returns hash bit number for given MAC address
 364  * example:
 365  * 01 00 5E 00 00 01 -> returns bit number 31 */
 366 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
 367 {
 368         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
 369 }
 370
 371 static void smsc95xx_set_multicast(struct net_device *netdev)
 372 {
 373         struct usbnet *dev = netdev_priv(netdev);
 374         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 375         unsigned long flags;
 376
 377         pdata->hash_hi = 0;
 378         pdata->hash_lo = 0;
 379
 380         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 381
 382         if (dev->net->flags & IFF_PROMISC) {
 383                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
 384                 pdata->mac_cr |= MAC_CR_PRMS_;
 385                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 386         } else if (dev->net->flags & IFF_ALLMULTI) {
 387                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
 388                 pdata->mac_cr |= MAC_CR_MCPAS_;
 389                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
 390         } else if (!netdev_mc_empty(dev->net)) {
 391                 struct netdev_hw_addr *ha;
 392
 393                 pdata->mac_cr |= MAC_CR_HPFILT_;
 394                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
 395
 396                 netdev_for_each_mc_addr(ha, netdev) {
 397                         u32 bitnum = smsc95xx_hash(ha->addr);
 398                         u32 mask = 0x01 << (bitnum & 0x1F);
 399                         if (bitnum & 0x20)
 400                                 pdata->hash_hi |= mask;
 401                         else
 402                                 pdata->hash_lo |= mask;
 403                 }
 404
 405                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
 406                                    pdata->hash_hi, pdata->hash_lo);
 407         } else {
 408                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
 409                 pdata->mac_cr &=
 410                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
 411         }
 412
 413         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 414
 415         /* Initiate async writes, as we can't wait for completion here */
 416         smsc95xx_write_reg_async(dev, HASHH, &pdata->hash_hi);
 417         smsc95xx_write_reg_async(dev, HASHL, &pdata->hash_lo);
 418         smsc95xx_write_reg_async(dev, MAC_CR, &pdata->mac_cr);
 419 }
 420
 421 static void smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
 422                                             u16 lcladv, u16 rmtadv)
 423 {
 424         u32 flow, afc_cfg = 0;
 425
 426         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
 427         if (ret < 0) {
 428                 netdev_warn(dev->net, "error reading AFC_CFG\n");
 429                 return;
 430         }
 431
 432         if (duplex == DUPLEX_FULL) {
 433                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
 434
 435                 if (cap & FLOW_CTRL_RX)
 436                         flow = 0xFFFF0002;
 437                 else
 438                         flow = 0;
 439
 440                 if (cap & FLOW_CTRL_TX)
 441                         afc_cfg |= 0xF;
 442                 else
 443                         afc_cfg &= ~0xF;
 444
 445                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
 446                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
 447                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
 448         } else {
 449                 netif_dbg(dev, link, dev->net, "half duplex\n");
 450                 flow = 0;
 451                 afc_cfg |= 0xF;
 452         }
 453
 454         smsc95xx_write_reg(dev, FLOW, flow);
 455         smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
 456 }
 457
 458 static int smsc95xx_link_reset(struct usbnet *dev)
 459 {
 460         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 461         struct mii_if_info *mii = &dev->mii;
 462         struct ethtool_cmd ecmd;
 463         unsigned long flags;
 464         u16 lcladv, rmtadv;
 465         u32 intdata;
 466
 467         /* clear interrupt status */
 468         smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
 469         intdata = 0xFFFFFFFF;
 470         smsc95xx_write_reg(dev, INT_STS, intdata);
 471
 472         mii_check_media(mii, 1, 1);
 473         mii_ethtool_gset(&dev->mii, &ecmd);
 474         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 475         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 476
 477         netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x rmtadv: %04x\n",
 478                   ecmd.speed, ecmd.duplex, lcladv, rmtadv);
 479
 480         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 481         if (ecmd.duplex != DUPLEX_FULL) {
 482                 pdata->mac_cr &= ~MAC_CR_FDPX_;
 483                 pdata->mac_cr |= MAC_CR_RCVOWN_;
 484         } else {
 485                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
 486                 pdata->mac_cr |= MAC_CR_FDPX_;
 487         }
 488         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 489
 490         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 491
 492         smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 493
 494         return 0;
 495 }
 496
 497 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
 498 {
 499         u32 intdata;
 500
 501         if (urb->actual_length != 4) {
 502                 netdev_warn(dev->net, "unexpected urb length %d\n",
 503                             urb->actual_length);
 504                 return;
 505         }
 506
 507         memcpy(&intdata, urb->transfer_buffer, 4);
 508         le32_to_cpus(&intdata);
 509
 510         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
 511
 512         if (intdata & INT_ENP_PHY_INT_)
 513                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
 514         else
 515                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
 516                             intdata);
 517 }
 518
 519 /* Enable or disable Tx & Rx checksum offload engines */
 520 static int smsc95xx_set_csums(struct usbnet *dev)
 521 {
 522         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 523         u32 read_buf;
 524         int ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
 525         if (ret < 0) {
 526                 netdev_warn(dev->net, "Failed to read COE_CR: %d\n", ret);
 527                 return ret;
 528         }
 529
 530         if (pdata->use_tx_csum)
 531                 read_buf |= Tx_COE_EN_;
 532         else
 533                 read_buf &= ~Tx_COE_EN_;
 534
 535         if (pdata->use_rx_csum)
 536                 read_buf |= Rx_COE_EN_;
 537         else
 538                 read_buf &= ~Rx_COE_EN_;
 539
 540         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
 541         if (ret < 0) {
 542                 netdev_warn(dev->net, "Failed to write COE_CR: %d\n", ret);
 543                 return ret;
 544         }
 545
 546         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
 547         return 0;
 548 }
 549
 550 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
 551 {
 552         return MAX_EEPROM_SIZE;
 553 }
 554
 555 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
 556                                        struct ethtool_eeprom *ee, u8 *data)
 557 {
 558         struct usbnet *dev = netdev_priv(netdev);
 559
 560         ee->magic = LAN95XX_EEPROM_MAGIC;
 561
 562         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
 563 }
 564
 565 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
 566                                        struct ethtool_eeprom *ee, u8 *data)
 567 {
 568         struct usbnet *dev = netdev_priv(netdev);
 569
 570         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
 571                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
 572                             ee->magic);
 573                 return -EINVAL;
 574         }
 575
 576         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
 577 }
 578
 579 static u32 smsc95xx_ethtool_get_rx_csum(struct net_device *netdev)
 580 {
 581         struct usbnet *dev = netdev_priv(netdev);
 582         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 583
 584         return pdata->use_rx_csum;
 585 }
 586
 587 static int smsc95xx_ethtool_set_rx_csum(struct net_device *netdev, u32 val)
 588 {
 589         struct usbnet *dev = netdev_priv(netdev);
 590         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 591
 592         pdata->use_rx_csum = !!val;
 593
 594         return smsc95xx_set_csums(dev);
 595 }
 596
 597 static u32 smsc95xx_ethtool_get_tx_csum(struct net_device *netdev)
 598 {
 599         struct usbnet *dev = netdev_priv(netdev);
 600         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 601
 602         return pdata->use_tx_csum;
 603 }
 604
 605 static int smsc95xx_ethtool_set_tx_csum(struct net_device *netdev, u32 val)
 606 {
 607         struct usbnet *dev = netdev_priv(netdev);
 608         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 609
 610         pdata->use_tx_csum = !!val;
 611
 612         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 613         return smsc95xx_set_csums(dev);
 614 }
 615
 616 static const struct ethtool_ops smsc95xx_ethtool_ops = {
 617         .get_link       = usbnet_get_link,
 618         .nway_reset     = usbnet_nway_reset,
 619         .get_drvinfo    = usbnet_get_drvinfo,
 620         .get_msglevel   = usbnet_get_msglevel,
 621         .set_msglevel   = usbnet_set_msglevel,
 622         .get_settings   = usbnet_get_settings,
 623         .set_settings   = usbnet_set_settings,
 624         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
 625         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
 626         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
 627         .get_tx_csum    = smsc95xx_ethtool_get_tx_csum,
 628         .set_tx_csum    = smsc95xx_ethtool_set_tx_csum,
 629         .get_rx_csum    = smsc95xx_ethtool_get_rx_csum,
 630         .set_rx_csum    = smsc95xx_ethtool_set_rx_csum,
 631 };
 632
 633 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 634 {
 635         struct usbnet *dev = netdev_priv(netdev);
 636
 637         if (!netif_running(netdev))
 638                 return -EINVAL;
 639
 640         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 641 }
 642
 643 static void smsc95xx_init_mac_address(struct usbnet *dev)
 644 {
 645         /* try reading mac address from EEPROM */
 646         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 647                         dev->net->dev_addr) == 0) {
 648                 if (is_valid_ether_addr(dev->net->dev_addr)) {
 649                         /* eeprom values are valid so use them */
 650                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
 651                         return;
 652                 }
 653         }
 654
 655         /* no eeprom, or eeprom values are invalid. generate random MAC */
 656         random_ether_addr(dev->net->dev_addr);
 657         netif_dbg(dev, ifup, dev->net, "MAC address set to random_ether_addr\n");
 658 }
 659
 660 static int smsc95xx_set_mac_address(struct usbnet *dev)
 661 {
 662         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
 663                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
 664         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
 665         int ret;
 666
 667         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
 668         if (ret < 0) {
 669                 netdev_warn(dev->net, "Failed to write ADDRL: %d\n", ret);
 670                 return ret;
 671         }
 672
 673         ret = smsc95xx_write_reg(dev, ADDRH, addr_hi);
 674         if (ret < 0) {
 675                 netdev_warn(dev->net, "Failed to write ADDRH: %d\n", ret);
 676                 return ret;
 677         }
 678
 679         return 0;
 680 }
 681
 682 /* starts the TX path */
 683 static void smsc95xx_start_tx_path(struct usbnet *dev)
 684 {
 685         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 686         unsigned long flags;
 687         u32 reg_val;
 688
 689         /* Enable Tx at MAC */
 690         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 691         pdata->mac_cr |= MAC_CR_TXEN_;
 692         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 693
 694         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 695
 696         /* Enable Tx at SCSRs */
 697         reg_val = TX_CFG_ON_;
 698         smsc95xx_write_reg(dev, TX_CFG, reg_val);
 699 }
 700
 701 /* Starts the Receive path */
 702 static void smsc95xx_start_rx_path(struct usbnet *dev)
 703 {
 704         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 705         unsigned long flags;
 706
 707         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 708         pdata->mac_cr |= MAC_CR_RXEN_;
 709         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 710
 711         smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
 712 }
 713
 714 static int smsc95xx_phy_initialize(struct usbnet *dev)
 715 {
 716         int bmcr, timeout = 0;
 717
 718         /* Initialize MII structure */
 719         dev->mii.dev = dev->net;
 720         dev->mii.mdio_read = smsc95xx_mdio_read;
 721         dev->mii.mdio_write = smsc95xx_mdio_write;
 722         dev->mii.phy_id_mask = 0x1f;
 723         dev->mii.reg_num_mask = 0x1f;
 724         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
 725
 726         /* reset phy and wait for reset to complete */
 727         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
 728
 729         do {
 730                 msleep(10);
 731                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
 732                 timeout++;
 733         } while ((bmcr & MII_BMCR) && (timeout < 100));
 734
 735         if (timeout >= 100) {
 736                 netdev_warn(dev->net, "timeout on PHY Reset");
 737                 return -EIO;
 738         }
 739
 740         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
 741                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
 742                 ADVERTISE_PAUSE_ASYM);
 743
 744         /* read to clear */
 745         smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
 746
 747         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
 748                 PHY_INT_MASK_DEFAULT_);
 749         mii_nway_restart(&dev->mii);
 750
 751         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
 752         return 0;
 753 }
 754
 755 static int smsc95xx_reset(struct usbnet *dev)
 756 {
 757         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 758         struct net_device *netdev = dev->net;
 759         u32 read_buf, write_buf, burst_cap;
 760         int ret = 0, timeout;
 761
 762         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
 763
 764         write_buf = HW_CFG_LRST_;
 765         ret = smsc95xx_write_reg(dev, HW_CFG, write_buf);
 766         if (ret < 0) {
 767                 netdev_warn(dev->net, "Failed to write HW_CFG_LRST_ bit in HW_CFG register, ret = %d\n",
 768                             ret);
 769                 return ret;
 770         }
 771
 772         timeout = 0;
 773         do {
 774                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 775                 if (ret < 0) {
 776                         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 777                         return ret;
 778                 }
 779                 msleep(10);
 780                 timeout++;
 781         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
 782
 783         if (timeout >= 100) {
 784                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
 785                 return ret;
 786         }
 787
 788         write_buf = PM_CTL_PHY_RST_;
 789         ret = smsc95xx_write_reg(dev, PM_CTRL, write_buf);
 790         if (ret < 0) {
 791                 netdev_warn(dev->net, "Failed to write PM_CTRL: %d\n", ret);
 792                 return ret;
 793         }
 794
 795         timeout = 0;
 796         do {
 797                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
 798                 if (ret < 0) {
 799                         netdev_warn(dev->net, "Failed to read PM_CTRL: %d\n", ret);
 800                         return ret;
 801                 }
 802                 msleep(10);
 803                 timeout++;
 804         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
 805
 806         if (timeout >= 100) {
 807                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
 808                 return ret;
 809         }
 810
 811         ret = smsc95xx_set_mac_address(dev);
 812         if (ret < 0)
 813                 return ret;
 814
 815         netif_dbg(dev, ifup, dev->net,
 816                   "MAC Address: %pM\n", dev->net->dev_addr);
 817
 818         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 819         if (ret < 0) {
 820                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 821                 return ret;
 822         }
 823
 824         netif_dbg(dev, ifup, dev->net,
 825                   "Read Value from HW_CFG : 0x%08x\n", read_buf);
 826
 827         read_buf |= HW_CFG_BIR_;
 828
 829         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 830         if (ret < 0) {
 831                 netdev_warn(dev->net, "Failed to write HW_CFG_BIR_ bit in HW_CFG register, ret = %d\n",
 832                             ret);
 833                 return ret;
 834         }
 835
 836         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 837         if (ret < 0) {
 838                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 839                 return ret;
 840         }
 841         netif_dbg(dev, ifup, dev->net,
 842                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
 843                   read_buf);
 844
 845         if (!turbo_mode) {
 846                 burst_cap = 0;
 847                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
 848         } else if (dev->udev->speed == USB_SPEED_HIGH) {
 849                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
 850                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
 851         } else {
 852                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
 853                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
 854         }
 855
 856         netif_dbg(dev, ifup, dev->net,
 857                   "rx_urb_size=%ld\n", (ulong)dev->rx_urb_size);
 858
 859         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
 860         if (ret < 0) {
 861                 netdev_warn(dev->net, "Failed to write BURST_CAP: %d\n", ret);
 862                 return ret;
 863         }
 864
 865         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
 866         if (ret < 0) {
 867                 netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
 868                 return ret;
 869         }
 870         netif_dbg(dev, ifup, dev->net,
 871                   "Read Value from BURST_CAP after writing: 0x%08x\n",
 872                   read_buf);
 873
 874         read_buf = DEFAULT_BULK_IN_DELAY;
 875         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, read_buf);
 876         if (ret < 0) {
 877                 netdev_warn(dev->net, "ret = %d\n", ret);
 878                 return ret;
 879         }
 880
 881         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
 882         if (ret < 0) {
 883                 netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d\n", ret);
 884                 return ret;
 885         }
 886         netif_dbg(dev, ifup, dev->net,
 887                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
 888                   read_buf);
 889
 890         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 891         if (ret < 0) {
 892                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 893                 return ret;
 894         }
 895         netif_dbg(dev, ifup, dev->net,
 896                   "Read Value from HW_CFG: 0x%08x\n", read_buf);
 897
 898         if (turbo_mode)
 899                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
 900
 901         read_buf &= ~HW_CFG_RXDOFF_;
 902
 903         /* set Rx data offset=2, Make IP header aligns on word boundary. */
 904         read_buf |= NET_IP_ALIGN << 9;
 905
 906         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
 907         if (ret < 0) {
 908                 netdev_warn(dev->net, "Failed to write HW_CFG register, ret=%d\n",
 909                             ret);
 910                 return ret;
 911         }
 912
 913         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
 914         if (ret < 0) {
 915                 netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
 916                 return ret;
 917         }
 918         netif_dbg(dev, ifup, dev->net,
 919                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
 920
 921         write_buf = 0xFFFFFFFF;
 922         ret = smsc95xx_write_reg(dev, INT_STS, write_buf);
 923         if (ret < 0) {
 924                 netdev_warn(dev->net, "Failed to write INT_STS register, ret=%d\n",
 925                             ret);
 926                 return ret;
 927         }
 928
 929         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
 930         if (ret < 0) {
 931                 netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
 932                 return ret;
 933         }
 934         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
 935
 936         /* Configure GPIO pins as LED outputs */
 937         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
 938                 LED_GPIO_CFG_FDX_LED;
 939         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
 940         if (ret < 0) {
 941                 netdev_warn(dev->net, "Failed to write LED_GPIO_CFG register, ret=%d\n",
 942                             ret);
 943                 return ret;
 944         }
 945
 946         /* Init Tx */
 947         write_buf = 0;
 948         ret = smsc95xx_write_reg(dev, FLOW, write_buf);
 949         if (ret < 0) {
 950                 netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
 951                 return ret;
 952         }
 953
 954         read_buf = AFC_CFG_DEFAULT;
 955         ret = smsc95xx_write_reg(dev, AFC_CFG, read_buf);
 956         if (ret < 0) {
 957                 netdev_warn(dev->net, "Failed to write AFC_CFG: %d\n", ret);
 958                 return ret;
 959         }
 960
 961         /* Don't need mac_cr_lock during initialisation */
 962         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
 963         if (ret < 0) {
 964                 netdev_warn(dev->net, "Failed to read MAC_CR: %d\n", ret);
 965                 return ret;
 966         }
 967
 968         /* Init Rx */
 969         /* Set Vlan */
 970         write_buf = (u32)ETH_P_8021Q;
 971         ret = smsc95xx_write_reg(dev, VLAN1, write_buf);
 972         if (ret < 0) {
 973                 netdev_warn(dev->net, "Failed to write VAN1: %d\n", ret);
 974                 return ret;
 975         }
 976
 977         /* Enable or disable checksum offload engines */
 978         ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
 979         ret = smsc95xx_set_csums(dev);
 980         if (ret < 0) {
 981                 netdev_warn(dev->net, "Failed to set csum offload: %d\n", ret);
 982                 return ret;
 983         }
 984
 985         smsc95xx_set_multicast(dev->net);
 986
 987         if (smsc95xx_phy_initialize(dev) < 0)
 988                 return -EIO;
 989
 990         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
 991         if (ret < 0) {
 992                 netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d\n", ret);
 993                 return ret;
 994         }
 995
 996         /* enable PHY interrupts */
 997         read_buf |= INT_EP_CTL_PHY_INT_;
 998
 999         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1000         if (ret < 0) {
1001                 netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d\n", ret);
1002                 return ret;
1003         }
1004
1005         smsc95xx_start_tx_path(dev);
1006         smsc95xx_start_rx_path(dev);
1007
1008         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1009         return 0;
1010 }
1011
1012 static const struct net_device_ops smsc95xx_netdev_ops = {
1013         .ndo_open               = usbnet_open,
1014         .ndo_stop               = usbnet_stop,
1015         .ndo_start_xmit         = usbnet_start_xmit,
1016         .ndo_tx_timeout         = usbnet_tx_timeout,
1017         .ndo_change_mtu         = usbnet_change_mtu,
1018         .ndo_set_mac_address    = eth_mac_addr,
1019         .ndo_validate_addr      = eth_validate_addr,
1020         .ndo_do_ioctl           = smsc95xx_ioctl,
1021         .ndo_set_multicast_list = smsc95xx_set_multicast,
1022 };
1023
1024 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1025 {
1026         struct smsc95xx_priv *pdata = NULL;
1027         int ret;
1028
1029         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1030
1031         ret = usbnet_get_endpoints(dev, intf);
1032         if (ret < 0) {
1033                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1034                 return ret;
1035         }
1036
1037         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1038                 GFP_KERNEL);
1039
1040         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1041         if (!pdata) {
1042                 netdev_warn(dev->net, "Unable to allocate struct smsc95xx_priv\n");
1043                 return -ENOMEM;
1044         }
1045
1046         spin_lock_init(&pdata->mac_cr_lock);
1047
1048         pdata->use_tx_csum = DEFAULT_TX_CSUM_ENABLE;
1049         pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;
1050
1051         smsc95xx_init_mac_address(dev);
1052
1053         /* Init all registers */
1054         ret = smsc95xx_reset(dev);
1055
1056         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1057         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1058         dev->net->flags |= IFF_MULTICAST;
1059         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD;
1060         return 0;
1061 }
1062
1063 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1064 {
1065         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1066         if (pdata) {
1067                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1068                 kfree(pdata);
1069                 pdata = NULL;
1070                 dev->data[0] = 0;
1071         }
1072 }
1073
1074 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1075 {
1076         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1077         skb->ip_summed = CHECKSUM_COMPLETE;
1078         skb_trim(skb, skb->len - 2);
1079 }
1080
1081 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1082 {
1083         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1084
1085         while (skb->len > 0) {
1086                 u32 header, align_count;
1087                 struct sk_buff *ax_skb;
1088                 unsigned char *packet;
1089                 u16 size;
1090
1091                 memcpy(&header, skb->data, sizeof(header));
1092                 le32_to_cpus(&header);
1093                 skb_pull(skb, 4 + NET_IP_ALIGN);
1094                 packet = skb->data;
1095
1096                 /* get the packet length */
1097                 size = (u16)((header & RX_STS_FL_) >> 16);
1098                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1099
1100                 if (unlikely(header & RX_STS_ES_)) {
1101                         netif_dbg(dev, rx_err, dev->net,
1102                                   "Error header=0x%08x\n", header);
1103                         dev->net->stats.rx_errors++;
1104                         dev->net->stats.rx_dropped++;
1105
1106                         if (header & RX_STS_CRC_) {
1107                                 dev->net->stats.rx_crc_errors++;
1108                         } else {
1109                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1110                                         dev->net->stats.rx_frame_errors++;
1111
1112                                 if ((header & RX_STS_LE_) &&
1113                                         (!(header & RX_STS_FT_)))
1114                                         dev->net->stats.rx_length_errors++;
1115                         }
1116                 } else {
1117                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1118                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1119                                 netif_dbg(dev, rx_err, dev->net,
1120                                           "size err header=0x%08x\n", header);
1121                                 return 0;
1122                         }
1123
1124                         /* last frame in this batch */
1125                         if (skb->len == size) {
1126                                 if (pdata->use_rx_csum)
1127                                         smsc95xx_rx_csum_offload(skb);
1128                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1129                                 skb->truesize = size + sizeof(struct sk_buff);
1130
1131                                 return 1;
1132                         }
1133
1134                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1135                         if (unlikely(!ax_skb)) {
1136                                 netdev_warn(dev->net, "Error allocating skb\n");
1137                                 return 0;
1138                         }
1139
1140                         ax_skb->len = size;
1141                         ax_skb->data = packet;
1142                         skb_set_tail_pointer(ax_skb, size);
1143
1144                         if (pdata->use_rx_csum)
1145                                 smsc95xx_rx_csum_offload(ax_skb);
1146                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1147                         ax_skb->truesize = size + sizeof(struct sk_buff);
1148
1149                         usbnet_skb_return(dev, ax_skb);
1150                 }
1151
1152                 skb_pull(skb, size);
1153
1154                 /* padding bytes before the next frame starts */
1155                 if (skb->len)
1156                         skb_pull(skb, align_count);
1157         }
1158
1159         if (unlikely(skb->len < 0)) {
1160                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1161                 return 0;
1162         }
1163
1164         return 1;
1165 }
1166
1167 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1168 {
1169         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1170         u16 high_16 = low_16 + skb->csum_offset;
1171         return (high_16 << 16) | low_16;
1172 }
1173
1174 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1175                                          struct sk_buff *skb, gfp_t flags)
1176 {
1177         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1178         bool csum = pdata->use_tx_csum && (skb->ip_summed == CHECKSUM_PARTIAL);
1179         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1180         u32 tx_cmd_a, tx_cmd_b;
1181
1182         /* We do not advertise SG, so skbs should be already linearized */
1183         BUG_ON(skb_shinfo(skb)->nr_frags);
1184
1185         if (skb_headroom(skb) < overhead) {
1186                 struct sk_buff *skb2 = skb_copy_expand(skb,
1187                         overhead, 0, flags);
1188                 dev_kfree_skb_any(skb);
1189                 skb = skb2;
1190                 if (!skb)
1191                         return NULL;
1192         }
1193
1194         if (csum) {
1195                 if (skb->len <= 45) {
1196                         /* workaround - hardware tx checksum does not work
1197                          * properly with extremely small packets */
1198                         long csstart = skb_checksum_start_offset(skb);
1199                         __wsum calc = csum_partial(skb->data + csstart,
1200                                 skb->len - csstart, 0);
1201                         *((__sum16 *)(skb->data + csstart
1202                                 + skb->csum_offset)) = csum_fold(calc);
1203
1204                         csum = false;
1205                 } else {
1206                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1207                         skb_push(skb, 4);
1208                         memcpy(skb->data, &csum_preamble, 4);
1209                 }
1210         }
1211
1212         skb_push(skb, 4);
1213         tx_cmd_b = (u32)(skb->len - 4);
1214         if (csum)
1215                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1216         cpu_to_le32s(&tx_cmd_b);
1217         memcpy(skb->data, &tx_cmd_b, 4);
1218
1219         skb_push(skb, 4);
1220         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1221                 TX_CMD_A_LAST_SEG_;
1222         cpu_to_le32s(&tx_cmd_a);
1223         memcpy(skb->data, &tx_cmd_a, 4);
1224
1225         return skb;
1226 }
1227
1228 static const struct driver_info smsc95xx_info = {
1229         .description    = "smsc95xx USB 2.0 Ethernet",
1230         .bind           = smsc95xx_bind,
1231         .unbind         = smsc95xx_unbind,
1232         .link_reset     = smsc95xx_link_reset,
1233         .reset          = smsc95xx_reset,
1234         .rx_fixup       = smsc95xx_rx_fixup,
1235         .tx_fixup       = smsc95xx_tx_fixup,
1236         .status         = smsc95xx_status,
1237         .flags          = FLAG_ETHER | FLAG_SEND_ZLP,
1238 };
1239
1240 static const struct usb_device_id products[] = {
1241         {
1242                 /* SMSC9500 USB Ethernet Device */
1243                 USB_DEVICE(0x0424, 0x9500),
1244                 .driver_info = (unsigned long) &smsc95xx_info,
1245         },
1246         {
1247                 /* SMSC9505 USB Ethernet Device */
1248                 USB_DEVICE(0x0424, 0x9505),
1249                 .driver_info = (unsigned long) &smsc95xx_info,
1250         },
1251         {
1252                 /* SMSC9500A USB Ethernet Device */
1253                 USB_DEVICE(0x0424, 0x9E00),
1254                 .driver_info = (unsigned long) &smsc95xx_info,
1255         },
1256         {
1257                 /* SMSC9505A USB Ethernet Device */
1258                 USB_DEVICE(0x0424, 0x9E01),
1259                 .driver_info = (unsigned long) &smsc95xx_info,
1260         },
1261         {
1262                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1263                 USB_DEVICE(0x0424, 0xec00),
1264                 .driver_info = (unsigned long) &smsc95xx_info,
1265         },
1266         {
1267                 /* SMSC9500 USB Ethernet Device (SAL10) */
1268                 USB_DEVICE(0x0424, 0x9900),
1269                 .driver_info = (unsigned long) &smsc95xx_info,
1270         },
1271         {
1272                 /* SMSC9505 USB Ethernet Device (SAL10) */
1273                 USB_DEVICE(0x0424, 0x9901),
1274                 .driver_info = (unsigned long) &smsc95xx_info,
1275         },
1276         {
1277                 /* SMSC9500A USB Ethernet Device (SAL10) */
1278                 USB_DEVICE(0x0424, 0x9902),
1279                 .driver_info = (unsigned long) &smsc95xx_info,
1280         },
1281         {
1282                 /* SMSC9505A USB Ethernet Device (SAL10) */
1283                 USB_DEVICE(0x0424, 0x9903),
1284                 .driver_info = (unsigned long) &smsc95xx_info,
1285         },
1286         {
1287                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1288                 USB_DEVICE(0x0424, 0x9904),
1289                 .driver_info = (unsigned long) &smsc95xx_info,
1290         },
1291         {
1292                 /* SMSC9500A USB Ethernet Device (HAL) */
1293                 USB_DEVICE(0x0424, 0x9905),
1294                 .driver_info = (unsigned long) &smsc95xx_info,
1295         },
1296         {
1297                 /* SMSC9505A USB Ethernet Device (HAL) */
1298                 USB_DEVICE(0x0424, 0x9906),
1299                 .driver_info = (unsigned long) &smsc95xx_info,
1300         },
1301         {
1302                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1303                 USB_DEVICE(0x0424, 0x9907),
1304                 .driver_info = (unsigned long) &smsc95xx_info,
1305         },
1306         {
1307                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1308                 USB_DEVICE(0x0424, 0x9908),
1309                 .driver_info = (unsigned long) &smsc95xx_info,
1310         },
1311         {
1312                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1313                 USB_DEVICE(0x0424, 0x9909),
1314                 .driver_info = (unsigned long) &smsc95xx_info,
1315         },
1316         {
1317                 /* SMSC LAN9530 USB Ethernet Device */
1318                 USB_DEVICE(0x0424, 0x9530),
1319                 .driver_info = (unsigned long) &smsc95xx_info,
1320         },
1321         {
1322                 /* SMSC LAN9730 USB Ethernet Device */
1323                 USB_DEVICE(0x0424, 0x9730),
1324                 .driver_info = (unsigned long) &smsc95xx_info,
1325         },
1326         {
1327                 /* SMSC LAN89530 USB Ethernet Device */
1328                 USB_DEVICE(0x0424, 0x9E08),
1329                 .driver_info = (unsigned long) &smsc95xx_info,
1330         },
1331         { },            /* END */
1332 };
1333 MODULE_DEVICE_TABLE(usb, products);
1334
1335 static struct usb_driver smsc95xx_driver = {
1336         .name           = "smsc95xx",
1337         .id_table       = products,
1338         .probe          = usbnet_probe,
1339         .suspend        = usbnet_suspend,
1340         .resume         = usbnet_resume,
1341         .disconnect     = usbnet_disconnect,
1342 };
1343
1344 static int __init smsc95xx_init(void)
1345 {
1346         return usb_register(&smsc95xx_driver);
1347 }
1348 module_init(smsc95xx_init);
1349
1350 static void __exit smsc95xx_exit(void)
1351 {
1352         usb_deregister(&smsc95xx_driver);
1353 }
1354 module_exit(smsc95xx_exit);
1355
1356 MODULE_AUTHOR("Nancy Lin");
1357 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1358 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
1359 MODULE_LICENSE("GPL");