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linux-next/drivers/usb/net/kaweth.c
Herbert Xu d23b536bb7 [PATCH] USB: fix race in kaweth disconnect 
this patch from Herbert Xu fixes a race by moving termination of
the URBs into close() exclusively.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-17 11:29:54 -08:00

1260 lines
35 KiB
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/****************************************************************
*
* kaweth.c - driver for KL5KUSB101 based USB->Ethernet
*
* (c) 2000 Interlan Communications
* (c) 2000 Stephane Alnet
* (C) 2001 Brad Hards
* (C) 2002 Oliver Neukum
*
* Original author: The Zapman <zapman@interlan.net>
* Inspired by, and much credit goes to Michael Rothwell
* <rothwell@interlan.net> for the test equipment, help, and patience
* Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
* Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
* for providing the firmware and driver resources.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
****************************************************************/
/* TODO:
* Fix in_interrupt() problem
* Develop test procedures for USB net interfaces
* Run test procedures
* Fix bugs from previous two steps
* Snoop other OSs for any tricks we're not doing
* SMP locking
* Reduce arbitrary timeouts
* Smart multicast support
* Temporary MAC change support
* Tunable SOFs parameter - ioctl()?
* Ethernet stats collection
* Code formatting improvements
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/usb.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/wait.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>
#undef DEBUG
#ifdef DEBUG
#define kaweth_dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" ,##arg)
#else
#define kaweth_dbg(format, arg...) do {} while (0)
#endif
#define kaweth_err(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" ,##arg)
#define kaweth_info(format, arg...) printk(KERN_INFO __FILE__ ": " format "\n" , ##arg)
#define kaweth_warn(format, arg...) printk(KERN_WARNING __FILE__ ": " format "\n" , ##arg)
#include "kawethfw.h"
#define KAWETH_MTU 1514
#define KAWETH_BUF_SIZE 1664
#define KAWETH_TX_TIMEOUT (5 * HZ)
#define KAWETH_SCRATCH_SIZE 32
#define KAWETH_FIRMWARE_BUF_SIZE 4096
#define KAWETH_CONTROL_TIMEOUT (30 * HZ)
#define KAWETH_STATUS_BROKEN 0x0000001
#define KAWETH_STATUS_CLOSING 0x0000002
#define KAWETH_PACKET_FILTER_PROMISCUOUS 0x01
#define KAWETH_PACKET_FILTER_ALL_MULTICAST 0x02
#define KAWETH_PACKET_FILTER_DIRECTED 0x04
#define KAWETH_PACKET_FILTER_BROADCAST 0x08
#define KAWETH_PACKET_FILTER_MULTICAST 0x10
/* Table 7 */
#define KAWETH_COMMAND_GET_ETHERNET_DESC 0x00
#define KAWETH_COMMAND_MULTICAST_FILTERS 0x01
#define KAWETH_COMMAND_SET_PACKET_FILTER 0x02
#define KAWETH_COMMAND_STATISTICS 0x03
#define KAWETH_COMMAND_SET_TEMP_MAC 0x06
#define KAWETH_COMMAND_GET_TEMP_MAC 0x07
#define KAWETH_COMMAND_SET_URB_SIZE 0x08
#define KAWETH_COMMAND_SET_SOFS_WAIT 0x09
#define KAWETH_COMMAND_SCAN 0xFF
#define KAWETH_SOFS_TO_WAIT 0x05
#define INTBUFFERSIZE 4
#define STATE_OFFSET 0
#define STATE_MASK 0x40
#define STATE_SHIFT 5
MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
MODULE_LICENSE("GPL");
static const char driver_name[] = "kaweth";
static int kaweth_probe(
struct usb_interface *intf,
const struct usb_device_id *id /* from id_table */
);
static void kaweth_disconnect(struct usb_interface *intf);
static int kaweth_internal_control_msg(struct usb_device *usb_dev,
unsigned int pipe,
struct usb_ctrlrequest *cmd, void *data,
int len, int timeout);
/****************************************************************
* usb_device_id
****************************************************************/
static struct usb_device_id usb_klsi_table[] = {
{ USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
{ USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
{ USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
{ USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
{ USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
{ USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
{ USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
{ USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
{ USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
{ USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
{ USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
{ USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
{ USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
{ USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
{ USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
{ USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
{ USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
{ USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
{ USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
{ USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
{ USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
{ USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
{ USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
{ USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
{ USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
{ USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
{ USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
{ USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
{ USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
{ USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
{ USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
{ USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
{ USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
{} /* Null terminator */
};
MODULE_DEVICE_TABLE (usb, usb_klsi_table);
/****************************************************************
* kaweth_driver
****************************************************************/
static struct usb_driver kaweth_driver = {
.owner = THIS_MODULE,
.name = driver_name,
.probe = kaweth_probe,
.disconnect = kaweth_disconnect,
.id_table = usb_klsi_table,
};
typedef __u8 eth_addr_t[6];
/****************************************************************
* usb_eth_dev
****************************************************************/
struct usb_eth_dev {
char *name;
__u16 vendor;
__u16 device;
void *pdata;
};
/****************************************************************
* kaweth_ethernet_configuration
* Refer Table 8
****************************************************************/
struct kaweth_ethernet_configuration
{
__u8 size;
__u8 reserved1;
__u8 reserved2;
eth_addr_t hw_addr;
__u32 statistics_mask;
__le16 segment_size;
__u16 max_multicast_filters;
__u8 reserved3;
} __attribute__ ((packed));
/****************************************************************
* kaweth_device
****************************************************************/
struct kaweth_device
{
spinlock_t device_lock;
__u32 status;
int end;
int suspend_lowmem_rx;
int suspend_lowmem_ctrl;
int linkstate;
struct work_struct lowmem_work;
struct usb_device *dev;
struct net_device *net;
wait_queue_head_t term_wait;
struct urb *rx_urb;
struct urb *tx_urb;
struct urb *irq_urb;
dma_addr_t intbufferhandle;
__u8 *intbuffer;
dma_addr_t rxbufferhandle;
__u8 *rx_buf;
struct sk_buff *tx_skb;
__u8 *firmware_buf;
__u8 scratch[KAWETH_SCRATCH_SIZE];
__u16 packet_filter_bitmap;
struct kaweth_ethernet_configuration configuration;
struct net_device_stats stats;
};
/****************************************************************
* kaweth_control
****************************************************************/
static int kaweth_control(struct kaweth_device *kaweth,
unsigned int pipe,
__u8 request,
__u8 requesttype,
__u16 value,
__u16 index,
void *data,
__u16 size,
int timeout)
{
struct usb_ctrlrequest *dr;
kaweth_dbg("kaweth_control()");
if(in_interrupt()) {
kaweth_dbg("in_interrupt()");
return -EBUSY;
}
dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
if (!dr) {
kaweth_dbg("kmalloc() failed");
return -ENOMEM;
}
dr->bRequestType= requesttype;
dr->bRequest = request;
dr->wValue = cpu_to_le16p(&value);
dr->wIndex = cpu_to_le16p(&index);
dr->wLength = cpu_to_le16p(&size);
return kaweth_internal_control_msg(kaweth->dev,
pipe,
dr,
data,
size,
timeout);
}
/****************************************************************
* kaweth_read_configuration
****************************************************************/
static int kaweth_read_configuration(struct kaweth_device *kaweth)
{
int retval;
kaweth_dbg("Reading kaweth configuration");
retval = kaweth_control(kaweth,
usb_rcvctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_GET_ETHERNET_DESC,
USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
0,
0,
(void *)&kaweth->configuration,
sizeof(kaweth->configuration),
KAWETH_CONTROL_TIMEOUT);
return retval;
}
/****************************************************************
* kaweth_set_urb_size
****************************************************************/
static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
{
int retval;
kaweth_dbg("Setting URB size to %d", (unsigned)urb_size);
retval = kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SET_URB_SIZE,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
urb_size,
0,
(void *)&kaweth->scratch,
0,
KAWETH_CONTROL_TIMEOUT);
return retval;
}
/****************************************************************
* kaweth_set_sofs_wait
****************************************************************/
static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
{
int retval;
kaweth_dbg("Set SOFS wait to %d", (unsigned)sofs_wait);
retval = kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SET_SOFS_WAIT,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
sofs_wait,
0,
(void *)&kaweth->scratch,
0,
KAWETH_CONTROL_TIMEOUT);
return retval;
}
/****************************************************************
* kaweth_set_receive_filter
****************************************************************/
static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
__u16 receive_filter)
{
int retval;
kaweth_dbg("Set receive filter to %d", (unsigned)receive_filter);
retval = kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SET_PACKET_FILTER,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
receive_filter,
0,
(void *)&kaweth->scratch,
0,
KAWETH_CONTROL_TIMEOUT);
return retval;
}
/****************************************************************
* kaweth_download_firmware
****************************************************************/
static int kaweth_download_firmware(struct kaweth_device *kaweth,
__u8 *data,
__u16 data_len,
__u8 interrupt,
__u8 type)
{
if(data_len > KAWETH_FIRMWARE_BUF_SIZE) {
kaweth_err("Firmware too big: %d", data_len);
return -ENOSPC;
}
memcpy(kaweth->firmware_buf, data, data_len);
kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
kaweth->firmware_buf[3] = data_len >> 8;
kaweth->firmware_buf[4] = type;
kaweth->firmware_buf[5] = interrupt;
kaweth_dbg("High: %i, Low:%i", kaweth->firmware_buf[3],
kaweth->firmware_buf[2]);
kaweth_dbg("Downloading firmware at %p to kaweth device at %p",
data,
kaweth);
kaweth_dbg("Firmware length: %d", data_len);
return kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SCAN,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
0,
0,
(void *)kaweth->firmware_buf,
data_len,
KAWETH_CONTROL_TIMEOUT);
}
/****************************************************************
* kaweth_trigger_firmware
****************************************************************/
static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
__u8 interrupt)
{
kaweth->firmware_buf[0] = 0xB6;
kaweth->firmware_buf[1] = 0xC3;
kaweth->firmware_buf[2] = 0x01;
kaweth->firmware_buf[3] = 0x00;
kaweth->firmware_buf[4] = 0x06;
kaweth->firmware_buf[5] = interrupt;
kaweth->firmware_buf[6] = 0x00;
kaweth->firmware_buf[7] = 0x00;
kaweth_dbg("Triggering firmware");
return kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SCAN,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
0,
0,
(void *)kaweth->firmware_buf,
8,
KAWETH_CONTROL_TIMEOUT);
}
/****************************************************************
* kaweth_reset
****************************************************************/
static int kaweth_reset(struct kaweth_device *kaweth)
{
int result;
kaweth_dbg("kaweth_reset(%p)", kaweth);
result = kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
USB_REQ_SET_CONFIGURATION,
0,
kaweth->dev->config[0].desc.bConfigurationValue,
0,
NULL,
0,
KAWETH_CONTROL_TIMEOUT);
mdelay(10);
kaweth_dbg("kaweth_reset() returns %d.",result);
return result;
}
static void kaweth_usb_receive(struct urb *, struct pt_regs *regs);
static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
/****************************************************************
int_callback
*****************************************************************/
static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
{
int status;
status = usb_submit_urb (kaweth->irq_urb, mf);
if (unlikely(status == -ENOMEM)) {
kaweth->suspend_lowmem_ctrl = 1;
schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
} else {
kaweth->suspend_lowmem_ctrl = 0;
}
if (status)
err ("can't resubmit intr, %s-%s, status %d",
kaweth->dev->bus->bus_name,
kaweth->dev->devpath, status);
}
static void int_callback(struct urb *u, struct pt_regs *regs)
{
struct kaweth_device *kaweth = u->context;
int act_state;
switch (u->status) {
case 0: /* success */
break;
case -ECONNRESET: /* unlink */
case -ENOENT:
case -ESHUTDOWN:
return;
/* -EPIPE: should clear the halt */
default: /* error */
goto resubmit;
}
/* we check the link state to report changes */
if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
if (act_state)
netif_carrier_on(kaweth->net);
else
netif_carrier_off(kaweth->net);
kaweth->linkstate = act_state;
}
resubmit:
kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
}
static void kaweth_resubmit_tl(void *d)
{
struct kaweth_device *kaweth = (struct kaweth_device *)d;
if (kaweth->status | KAWETH_STATUS_CLOSING)
return;
if (kaweth->suspend_lowmem_rx)
kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
if (kaweth->suspend_lowmem_ctrl)
kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
}
/****************************************************************
* kaweth_resubmit_rx_urb
****************************************************************/
static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
gfp_t mem_flags)
{
int result;
usb_fill_bulk_urb(kaweth->rx_urb,
kaweth->dev,
usb_rcvbulkpipe(kaweth->dev, 1),
kaweth->rx_buf,
KAWETH_BUF_SIZE,
kaweth_usb_receive,
kaweth);
kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
if (result == -ENOMEM) {
kaweth->suspend_lowmem_rx = 1;
schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
}
kaweth_err("resubmitting rx_urb %d failed", result);
} else {
kaweth->suspend_lowmem_rx = 0;
}
return result;
}
static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
/****************************************************************
* kaweth_usb_receive
****************************************************************/
static void kaweth_usb_receive(struct urb *urb, struct pt_regs *regs)
{
struct kaweth_device *kaweth = urb->context;
struct net_device *net = kaweth->net;
int count = urb->actual_length;
int count2 = urb->transfer_buffer_length;
__u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
struct sk_buff *skb;
if(unlikely(urb->status == -ECONNRESET || urb->status == -ESHUTDOWN))
/* we are killed - set a flag and wake the disconnect handler */
{
kaweth->end = 1;
wake_up(&kaweth->term_wait);
return;
}
if (kaweth->status & KAWETH_STATUS_CLOSING)
return;
if(urb->status && urb->status != -EREMOTEIO && count != 1) {
kaweth_err("%s RX status: %d count: %d packet_len: %d",
net->name,
urb->status,
count,
(int)pkt_len);
kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
return;
}
if(kaweth->net && (count > 2)) {
if(pkt_len > (count - 2)) {
kaweth_err("Packet length too long for USB frame (pkt_len: %x, count: %x)",pkt_len, count);
kaweth_err("Packet len & 2047: %x", pkt_len & 2047);
kaweth_err("Count 2: %x", count2);
kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
return;
}
if(!(skb = dev_alloc_skb(pkt_len+2))) {
kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
return;
}
skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
skb->dev = net;
eth_copy_and_sum(skb, kaweth->rx_buf + 2, pkt_len, 0);
skb_put(skb, pkt_len);
skb->protocol = eth_type_trans(skb, net);
netif_rx(skb);
kaweth->stats.rx_packets++;
kaweth->stats.rx_bytes += pkt_len;
}
kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
}
/****************************************************************
* kaweth_open
****************************************************************/
static int kaweth_open(struct net_device *net)
{
struct kaweth_device *kaweth = netdev_priv(net);
int res;
kaweth_dbg("Opening network device.");
res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
if (res)
return -EIO;
usb_fill_int_urb(
kaweth->irq_urb,
kaweth->dev,
usb_rcvintpipe(kaweth->dev, 3),
kaweth->intbuffer,
INTBUFFERSIZE,
int_callback,
kaweth,
250); /* overriding the descriptor */
kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
if (res) {
usb_kill_urb(kaweth->rx_urb);
return -EIO;
}
netif_start_queue(net);
kaweth_async_set_rx_mode(kaweth);
return 0;
}
/****************************************************************
* kaweth_close
****************************************************************/
static int kaweth_close(struct net_device *net)
{
struct kaweth_device *kaweth = netdev_priv(net);
netif_stop_queue(net);
kaweth->status |= KAWETH_STATUS_CLOSING;
usb_kill_urb(kaweth->irq_urb);
usb_kill_urb(kaweth->rx_urb);
usb_kill_urb(kaweth->tx_urb);
flush_scheduled_work();
/* a scheduled work may have resubmitted,
we hit them again */
usb_kill_urb(kaweth->irq_urb);
usb_kill_urb(kaweth->rx_urb);
kaweth->status &= ~KAWETH_STATUS_CLOSING;
return 0;
}
static void kaweth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
strlcpy(info->driver, driver_name, sizeof(info->driver));
}
static struct ethtool_ops ops = {
.get_drvinfo = kaweth_get_drvinfo
};
/****************************************************************
* kaweth_usb_transmit_complete
****************************************************************/
static void kaweth_usb_transmit_complete(struct urb *urb, struct pt_regs *regs)
{
struct kaweth_device *kaweth = urb->context;
struct sk_buff *skb = kaweth->tx_skb;
if (unlikely(urb->status != 0))
if (urb->status != -ENOENT)
kaweth_dbg("%s: TX status %d.", kaweth->net->name, urb->status);
netif_wake_queue(kaweth->net);
dev_kfree_skb_irq(skb);
}
/****************************************************************
* kaweth_start_xmit
****************************************************************/
static int kaweth_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct kaweth_device *kaweth = netdev_priv(net);
__le16 *private_header;
int res;
spin_lock(&kaweth->device_lock);
kaweth_async_set_rx_mode(kaweth);
netif_stop_queue(net);
/* We now decide whether we can put our special header into the sk_buff */
if (skb_cloned(skb) || skb_headroom(skb) < 2) {
/* no such luck - we make our own */
struct sk_buff *copied_skb;
copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
dev_kfree_skb_irq(skb);
skb = copied_skb;
if (!copied_skb) {
kaweth->stats.tx_errors++;
netif_start_queue(net);
spin_unlock(&kaweth->device_lock);
return 0;
}
}
private_header = (__le16 *)__skb_push(skb, 2);
*private_header = cpu_to_le16(skb->len-2);
kaweth->tx_skb = skb;
usb_fill_bulk_urb(kaweth->tx_urb,
kaweth->dev,
usb_sndbulkpipe(kaweth->dev, 2),
private_header,
skb->len,
kaweth_usb_transmit_complete,
kaweth);
kaweth->end = 0;
if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
{
kaweth_warn("kaweth failed tx_urb %d", res);
kaweth->stats.tx_errors++;
netif_start_queue(net);
dev_kfree_skb_irq(skb);
}
else
{
kaweth->stats.tx_packets++;
kaweth->stats.tx_bytes += skb->len;
net->trans_start = jiffies;
}
spin_unlock(&kaweth->device_lock);
return 0;
}
/****************************************************************
* kaweth_set_rx_mode
****************************************************************/
static void kaweth_set_rx_mode(struct net_device *net)
{
struct kaweth_device *kaweth = netdev_priv(net);
__u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
KAWETH_PACKET_FILTER_BROADCAST |
KAWETH_PACKET_FILTER_MULTICAST;
kaweth_dbg("Setting Rx mode to %d", packet_filter_bitmap);
netif_stop_queue(net);
if (net->flags & IFF_PROMISC) {
packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
}
else if ((net->mc_count) || (net->flags & IFF_ALLMULTI)) {
packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
}
kaweth->packet_filter_bitmap = packet_filter_bitmap;
netif_wake_queue(net);
}
/****************************************************************
* kaweth_async_set_rx_mode
****************************************************************/
static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
{
__u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
kaweth->packet_filter_bitmap = 0;
if (packet_filter_bitmap == 0)
return;
{
int result;
result = kaweth_control(kaweth,
usb_sndctrlpipe(kaweth->dev, 0),
KAWETH_COMMAND_SET_PACKET_FILTER,
USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
packet_filter_bitmap,
0,
(void *)&kaweth->scratch,
0,
KAWETH_CONTROL_TIMEOUT);
if(result < 0) {
kaweth_err("Failed to set Rx mode: %d", result);
}
else {
kaweth_dbg("Set Rx mode to %d", packet_filter_bitmap);
}
}
}
/****************************************************************
* kaweth_netdev_stats
****************************************************************/
static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
{
struct kaweth_device *kaweth = netdev_priv(dev);
return &kaweth->stats;
}
/****************************************************************
* kaweth_tx_timeout
****************************************************************/
static void kaweth_tx_timeout(struct net_device *net)
{
struct kaweth_device *kaweth = netdev_priv(net);
kaweth_warn("%s: Tx timed out. Resetting.", net->name);
kaweth->stats.tx_errors++;
net->trans_start = jiffies;
usb_unlink_urb(kaweth->tx_urb);
}
/****************************************************************
* kaweth_probe
****************************************************************/
static int kaweth_probe(
struct usb_interface *intf,
const struct usb_device_id *id /* from id_table */
)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct kaweth_device *kaweth;
struct net_device *netdev;
const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
int result = 0;
kaweth_dbg("Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x",
dev->devnum,
le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct),
le16_to_cpu(dev->descriptor.bcdDevice));
kaweth_dbg("Device at %p", dev);
kaweth_dbg("Descriptor length: %x type: %x",
(int)dev->descriptor.bLength,
(int)dev->descriptor.bDescriptorType);
netdev = alloc_etherdev(sizeof(*kaweth));
if (!netdev)
return -ENOMEM;
kaweth = netdev_priv(netdev);
kaweth->dev = dev;
kaweth->net = netdev;
spin_lock_init(&kaweth->device_lock);
init_waitqueue_head(&kaweth->term_wait);
kaweth_dbg("Resetting.");
kaweth_reset(kaweth);
/*
* If high byte of bcdDevice is nonzero, firmware is already
* downloaded. Don't try to do it again, or we'll hang the device.
*/
if (le16_to_cpu(dev->descriptor.bcdDevice) >> 8) {
kaweth_info("Firmware present in device.");
} else {
/* Download the firmware */
kaweth_info("Downloading firmware...");
kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
if ((result = kaweth_download_firmware(kaweth,
kaweth_new_code,
len_kaweth_new_code,
100,
2)) < 0) {
kaweth_err("Error downloading firmware (%d)", result);
goto err_fw;
}
if ((result = kaweth_download_firmware(kaweth,
kaweth_new_code_fix,
len_kaweth_new_code_fix,
100,
3)) < 0) {
kaweth_err("Error downloading firmware fix (%d)", result);
goto err_fw;
}
if ((result = kaweth_download_firmware(kaweth,
kaweth_trigger_code,
len_kaweth_trigger_code,
126,
2)) < 0) {
kaweth_err("Error downloading trigger code (%d)", result);
goto err_fw;
}
if ((result = kaweth_download_firmware(kaweth,
kaweth_trigger_code_fix,
len_kaweth_trigger_code_fix,
126,
3)) < 0) {
kaweth_err("Error downloading trigger code fix (%d)", result);
goto err_fw;
}
if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
kaweth_err("Error triggering firmware (%d)", result);
goto err_fw;
}
/* Device will now disappear for a moment... */
kaweth_info("Firmware loaded. I'll be back...");
err_fw:
free_page((unsigned long)kaweth->firmware_buf);
free_netdev(netdev);
return -EIO;
}
result = kaweth_read_configuration(kaweth);
if(result < 0) {
kaweth_err("Error reading configuration (%d), no net device created", result);
goto err_free_netdev;
}
kaweth_info("Statistics collection: %x", kaweth->configuration.statistics_mask);
kaweth_info("Multicast filter limit: %x", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
kaweth_info("MTU: %d", le16_to_cpu(kaweth->configuration.segment_size));
kaweth_info("Read MAC address %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
(int)kaweth->configuration.hw_addr[0],
(int)kaweth->configuration.hw_addr[1],
(int)kaweth->configuration.hw_addr[2],
(int)kaweth->configuration.hw_addr[3],
(int)kaweth->configuration.hw_addr[4],
(int)kaweth->configuration.hw_addr[5]);
if(!memcmp(&kaweth->configuration.hw_addr,
&bcast_addr,
sizeof(bcast_addr))) {
kaweth_err("Firmware not functioning properly, no net device created");
goto err_free_netdev;
}
if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
kaweth_dbg("Error setting URB size");
goto err_free_netdev;
}
if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
kaweth_err("Error setting SOFS wait");
goto err_free_netdev;
}
result = kaweth_set_receive_filter(kaweth,
KAWETH_PACKET_FILTER_DIRECTED |
KAWETH_PACKET_FILTER_BROADCAST |
KAWETH_PACKET_FILTER_MULTICAST);
if(result < 0) {
kaweth_err("Error setting receive filter");
goto err_free_netdev;
}
kaweth_dbg("Initializing net device.");
kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kaweth->tx_urb)
goto err_free_netdev;
kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kaweth->rx_urb)
goto err_only_tx;
kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kaweth->irq_urb)
goto err_tx_and_rx;
kaweth->intbuffer = usb_buffer_alloc( kaweth->dev,
INTBUFFERSIZE,
GFP_KERNEL,
&kaweth->intbufferhandle);
if (!kaweth->intbuffer)
goto err_tx_and_rx_and_irq;
kaweth->rx_buf = usb_buffer_alloc( kaweth->dev,
KAWETH_BUF_SIZE,
GFP_KERNEL,
&kaweth->rxbufferhandle);
if (!kaweth->rx_buf)
goto err_all_but_rxbuf;
memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
sizeof(kaweth->configuration.hw_addr));
netdev->open = kaweth_open;
netdev->stop = kaweth_close;
netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
netdev->tx_timeout = kaweth_tx_timeout;
netdev->hard_start_xmit = kaweth_start_xmit;
netdev->set_multicast_list = kaweth_set_rx_mode;
netdev->get_stats = kaweth_netdev_stats;
netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
SET_ETHTOOL_OPS(netdev, &ops);
/* kaweth is zeroed as part of alloc_netdev */
INIT_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl, (void *)kaweth);
SET_MODULE_OWNER(netdev);
usb_set_intfdata(intf, kaweth);
#if 0
// dma_supported() is deeply broken on almost all architectures
if (dma_supported (&intf->dev, 0xffffffffffffffffULL))
kaweth->net->features |= NETIF_F_HIGHDMA;
#endif
SET_NETDEV_DEV(netdev, &intf->dev);
if (register_netdev(netdev) != 0) {
kaweth_err("Error registering netdev.");
goto err_intfdata;
}
kaweth_info("kaweth interface created at %s", kaweth->net->name);
kaweth_dbg("Kaweth probe returning.");
return 0;
err_intfdata:
usb_set_intfdata(intf, NULL);
usb_buffer_free(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
err_all_but_rxbuf:
usb_buffer_free(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
err_tx_and_rx_and_irq:
usb_free_urb(kaweth->irq_urb);
err_tx_and_rx:
usb_free_urb(kaweth->rx_urb);
err_only_tx:
usb_free_urb(kaweth->tx_urb);
err_free_netdev:
free_netdev(netdev);
return -EIO;
}
/****************************************************************
* kaweth_disconnect
****************************************************************/
static void kaweth_disconnect(struct usb_interface *intf)
{
struct kaweth_device *kaweth = usb_get_intfdata(intf);
struct net_device *netdev;
kaweth_info("Unregistering");
usb_set_intfdata(intf, NULL);
if (!kaweth) {
kaweth_warn("unregistering non-existant device");
return;
}
netdev = kaweth->net;
kaweth_dbg("Unregistering net device");
unregister_netdev(netdev);
usb_free_urb(kaweth->rx_urb);
usb_free_urb(kaweth->tx_urb);
usb_free_urb(kaweth->irq_urb);
usb_buffer_free(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
usb_buffer_free(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
free_netdev(netdev);
}
// FIXME this completion stuff is a modified clone of
// an OLD version of some stuff in usb.c ...
struct usb_api_data {
wait_queue_head_t wqh;
int done;
};
/*-------------------------------------------------------------------*
* completion handler for compatibility wrappers (sync control/bulk) *
*-------------------------------------------------------------------*/
static void usb_api_blocking_completion(struct urb *urb, struct pt_regs *regs)
{
struct usb_api_data *awd = (struct usb_api_data *)urb->context;
awd->done=1;
wake_up(&awd->wqh);
}
/*-------------------------------------------------------------------*
* COMPATIBILITY STUFF *
*-------------------------------------------------------------------*/
// Starts urb and waits for completion or timeout
static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
{
struct usb_api_data awd;
int status;
init_waitqueue_head(&awd.wqh);
awd.done = 0;
urb->context = &awd;
status = usb_submit_urb(urb, GFP_NOIO);
if (status) {
// something went wrong
usb_free_urb(urb);
return status;
}
if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
// timeout
kaweth_warn("usb_control/bulk_msg: timeout");
usb_kill_urb(urb); // remove urb safely
status = -ETIMEDOUT;
}
else {
status = urb->status;
}
if (actual_length) {
*actual_length = urb->actual_length;
}
usb_free_urb(urb);
return status;
}
/*-------------------------------------------------------------------*/
// returns status (negative) or length (positive)
static int kaweth_internal_control_msg(struct usb_device *usb_dev,
unsigned int pipe,
struct usb_ctrlrequest *cmd, void *data,
int len, int timeout)
{
struct urb *urb;
int retv;
int length;
urb = usb_alloc_urb(0, GFP_NOIO);
if (!urb)
return -ENOMEM;
usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
len, usb_api_blocking_completion, NULL);
retv = usb_start_wait_urb(urb, timeout, &length);
if (retv < 0) {
return retv;
}
else {
return length;
}
}
/****************************************************************
* kaweth_init
****************************************************************/
static int __init kaweth_init(void)
{
kaweth_dbg("Driver loading");
return usb_register(&kaweth_driver);
}
/****************************************************************
* kaweth_exit
****************************************************************/
static void __exit kaweth_exit(void)
{
usb_deregister(&kaweth_driver);
}
module_init(kaweth_init);
module_exit(kaweth_exit);
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