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* NetChip 1080 Driver (USB Host-to-Host Link)
* Copyright (C) 2000 by David Brownell <dbrownell@users.sourceforge.net>
*/
/*
* This talks to the NetChip 1080, which can appear in "network cables"
* and other designs. This driver interoperates with the Win32 network
* drivers from NetChip, using the NetChip reference design.
*
* The IP-over-USB protocol here may be of interest. Embedded devices
* could implement it at the cost of two bulk endpoints, and whatever
* other system resources the desired IP-based applications need.
* Some Linux palmtops could support that today. (Devices that don't
* support the TTL-driven data mangling of the net1080 chip won't need
* the header/trailer support though.)
*
* STATUS:
*
* 13-sept-2000 experimental, new
*
* This doesn't yet do any network hotplugging, and there's no matching
* ifup policy script ... it should arrange bridging with "brctl", and
* should handle static and dynamic ("pump") setups.
*
* RX/TX queue sizes currently fixed at one due to URB unlink problems.
*
* 10-oct-2000
* usb_device_id table created.
*
* 28-oct-2000
* misc fixes; mostly, discard more TTL-mangled rx packets.
*
* 01-nov-2000
* usb_device_id table support added by Adam J. Richter <adam@yggdrasil.com>.
*
* 08-apr-2001 gb
* Identify version on module load.
*
*-------------------------------------------------------------------------*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/random.h>
#include <asm/unaligned.h>
#define DEBUG // error path messages
// #define VERBOSE // more; success messages
#define USE_TTL // timeout our reads
#if !defined (DEBUG) && defined (CONFIG_USB_DEBUG)
# define DEBUG
#endif
#include <linux/usb.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v1.0.0"
#define DRIVER_AUTHOR "David Brownell <dbrownell@users.sourceforge.net>"
#define DRIVER_DESC "NetChip 1080 Driver (USB Host-to-Host Link)"
static const struct usb_device_id products [] = {
// reference design
{ USB_DEVICE(0x1080, 0x525),
driver_info: (unsigned long) "NetChip TurboCONNECT" },
// Belkin, ...
{ }, // END
};
MODULE_DEVICE_TABLE (usb, products);
static u8 node_id [ETH_ALEN];
/*-------------------------------------------------------------------------
*
* NetChip protocol: ethernet framing, and only use bulk endpoints (01/81;
* not mailboxes 02/82 or status interrupt 83). Expects Ethernet bridging.
* Odd USB length == always short read.
* - nc_header
* - payload, in Ethernet framing (14 byte header etc)
* - (optional padding byte, if needed so length is odd)
* - nc_trailer
*/
struct nc_header {
u16 hdr_len; // sizeof nc_header (LE, all)
u16 packet_len; // packet size
u16 packet_id; // detects dropped packets
#define NC_MIN_HEADER 6
// all else is optional, and must start with:
// u16 vendorId; // from usb-if
// u16 productId;
};
#define NC_PAD_BYTE ((unsigned char)0xAC)
struct nc_trailer {
u16 packet_id;
};
// packetsize == f(mtu setting), with upper limit
#define NC_MAX_PACKET(mtu) (sizeof (struct nc_header) \
+ (mtu) \
+ 1 \
+ sizeof (struct nc_trailer))
#define MAX_PACKET 8191
// zero means no timeout; else, how long a 64 byte bulk
// read may be queued before HW flushes it.
#define NC_READ_TTL ((u8)255) // ms
/*-------------------------------------------------------------------------*/
// list of all devices we manage
static DECLARE_MUTEX (net1080_mutex);
static LIST_HEAD (net1080_list);
// Nineteen USB 1.1 max size bulk transactions per frame, max.
#if 0
#define RX_QLEN 4
#define TX_QLEN 4
#else
// unlink_urbs() has probs on OHCI without test8-pre patches.
#define RX_QLEN 1
#define TX_QLEN 1
#endif
enum skb_state {
illegal = 0,
tx_start, tx_done,
rx_start, rx_done, rx_cleanup
};
struct skb_data { // skb->cb is one of these
struct urb *urb;
struct net1080 *dev;
enum skb_state state;
size_t length;
};
struct net1080 {
// housekeeping
struct usb_device *udev;
const struct usb_device_id *prod_info;
struct semaphore mutex;
struct list_head dev_list;
wait_queue_head_t *wait;
// protocol/interface state
struct net_device net;
struct net_device_stats stats;
u16 packet_id;
// various kinds of pending driver work
struct sk_buff_head rxq;
struct sk_buff_head txq;
struct sk_buff_head done;
struct tasklet_struct bh;
};
#define mutex_lock(x) down(x)
#define mutex_unlock(x) up(x)
static void defer_bh (struct net1080 *dev, struct sk_buff *skb)
{
unsigned long flags;
skb_unlink (skb);
spin_lock_irqsave (&dev->done.lock, flags);
__skb_queue_tail (&dev->done, skb);
if (dev->done.qlen == 1)
tasklet_schedule (&dev->bh);
spin_unlock_irqrestore (&dev->done.lock, flags);
}
/*-------------------------------------------------------------------------
*
* We ignore most registers and EEPROM contents.
*/
#define REG_USBCTL ((u8)0x04)
#define REG_TTL ((u8)0x10)
#define REG_STATUS ((u8)0x11)
/*
* Vendor specific requests to read/write data
*/
#define REQUEST_REGISTER ((u8)0x10)
#define REQUEST_EEPROM ((u8)0x11)
#define CONTROL_TIMEOUT (500) /* msec */
static int
vendor_read (struct net1080 *dev, u8 req, u8 regnum, u16 *retval_ptr)
{
int status = usb_control_msg (dev->udev,
usb_rcvctrlpipe (dev->udev, 0),
req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, regnum,
retval_ptr, sizeof *retval_ptr,
CONTROL_TIMEOUT);
if (status > 0)
status = 0;
if (!status)
le16_to_cpus (retval_ptr);
return status;
}
static inline int
register_read (struct net1080 *dev, u8 regnum, u16 *retval_ptr)
{
return vendor_read (dev, REQUEST_REGISTER, regnum, retval_ptr);
}
// without retval, this can become fully async (usable in_interrupt)
static void
vendor_write (struct net1080 *dev, u8 req, u8 regnum, u16 value)
{
usb_control_msg (dev->udev,
usb_sndctrlpipe (dev->udev, 0),
req,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, regnum,
0, 0, // data is in setup packet
CONTROL_TIMEOUT);
}
static inline void
register_write (struct net1080 *dev, u8 regnum, u16 value)
{
vendor_write (dev, REQUEST_REGISTER, regnum, value);
}
#if 0
static void dump_registers (struct net1080 *dev)
{
u8 reg;
u16 value;
dbg ("%s registers:", dev->net.name);
for (reg = 0; reg < 0x20; reg++) {
int retval;
// reading some registers is trouble
if (reg >= 0x08 && reg <= 0xf)
continue;
if (reg >= 0x12 && reg <= 0x1e)
continue;
retval = register_read (dev, reg, &value);
if (retval < 0)
dbg ("%s reg [0x%x] ==> error %d",
dev->net.name, reg, retval);
else
dbg ("%s reg [0x%x] = 0x%x",
dev->net.name, reg, value);
}
}
#endif
/*-------------------------------------------------------------------------
*
* Control register
*/
#define USBCTL_WRITABLE_MASK 0x1f0f
// bits 15-13 reserved, r/o
#define USBCTL_ENABLE_LANG (1 << 12)
#define USBCTL_ENABLE_MFGR (1 << 11)
#define USBCTL_ENABLE_PROD (1 << 10)
#define USBCTL_ENABLE_SERIAL (1 << 9)
#define USBCTL_ENABLE_DEFAULTS (1 << 8)
// bits 7-4 reserved, r/o
#define USBCTL_FLUSH_OTHER (1 << 3)
#define USBCTL_FLUSH_THIS (1 << 2)
#define USBCTL_DISCONN_OTHER (1 << 1)
#define USBCTL_DISCONN_THIS (1 << 0)
#ifdef DEBUG
static void dump_usbctl (struct net1080 *dev, u16 usbctl)
{
dbg ("%s: USB %d dev %d usbctl 0x%x:%s%s%s%s%s;"
" this%s%s;"
" other%s%s; r/o 0x%x",
dev->net.name,
dev->udev->bus->busnum, dev->udev->devnum,
usbctl,
(usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
(usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
(usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
(usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
(usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
(usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
(usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
(usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
(usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
usbctl & ~USBCTL_WRITABLE_MASK
);
}
#else
static inline void dump_usbctl (struct net1080 *dev, u16 usbctl) {}
#endif
/*-------------------------------------------------------------------------
*
* Status register
*/
#define STATUS_PORT_A (1 << 15)
#define STATUS_CONN_OTHER (1 << 14)
#define STATUS_SUSPEND_OTHER (1 << 13)
#define STATUS_MAILBOX_OTHER (1 << 12)
#define STATUS_PACKETS_OTHER(n) (((n) >> 8) && 0x03)
#define STATUS_CONN_THIS (1 << 6)
#define STATUS_SUSPEND_THIS (1 << 5)
#define STATUS_MAILBOX_THIS (1 << 4)
#define STATUS_PACKETS_THIS(n) (((n) >> 0) && 0x03)
#define STATUS_UNSPEC_MASK 0x0c8c
#define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK))
#ifdef DEBUG
static void dump_status (struct net1080 *dev, u16 status)
{
dbg ("%s: USB %d dev %d status 0x%x:"
" this (%c) PKT=%d%s%s%s;"
" other PKT=%d%s%s%s; unspec 0x%x",
dev->net.name,
dev->udev->bus->busnum, dev->udev->devnum,
status,
// XXX the packet counts don't seem right
// (1 at reset, not 0); maybe UNSPEC too
(status & STATUS_PORT_A) ? 'A' : 'B',
STATUS_PACKETS_THIS (status),
(status & STATUS_CONN_THIS) ? " CON" : "",
(status & STATUS_SUSPEND_THIS) ? " SUS" : "",
(status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
STATUS_PACKETS_OTHER (status),
(status & STATUS_CONN_OTHER) ? " CON" : "",
(status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
(status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
status & STATUS_UNSPEC_MASK
);
}
#else
static inline void dump_status (struct net1080 *dev, u16 status) {}
#endif
/*-------------------------------------------------------------------------
*
* TTL register
*/
#define TTL_THIS(ttl) (0x00ff & ttl)
#define TTL_OTHER(ttl) (0x00ff & (ttl >> 8))
#define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this))))
#ifdef DEBUG
static void dump_ttl (struct net1080 *dev, u16 ttl)
{
dbg ("%s: USB %d dev %d ttl 0x%x this = %d, other = %d",
dev->net.name,
dev->udev->bus->busnum, dev->udev->devnum,
ttl,
TTL_THIS (ttl),
TTL_OTHER (ttl)
);
}
#else
static inline void dump_ttl (struct net1080 *dev, u16 ttl) {}
#endif
#define RUN_CONTEXT (in_irq () ? "in_irq" \
: (in_interrupt () ? "in_interrupt" : "can sleep"))
/*-------------------------------------------------------------------------*/
// ensure that the device is in a known state before using it.
// preconditions:
// caller owns the device mutex
// caller has a process context
static int net1080_reset (struct net1080 *dev)
{
u16 usbctl, status, ttl;
int retval;
if ((retval = register_read (dev, REG_STATUS, &status)) < 0) {
dbg ("can't read dev %d status: %d", dev->udev->devnum, retval);
goto done;
}
dump_status (dev, status);
if ((retval = register_read (dev, REG_USBCTL, &usbctl)) < 0) {
dbg ("can't read USBCTL, %d", retval);
goto done;
}
dump_usbctl (dev, usbctl);
register_write (dev, REG_USBCTL,
USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
if ((retval = register_read (dev, REG_TTL, &ttl)) < 0) {
dbg ("can't read TTL, %d", retval);
goto done;
}
dump_ttl (dev, ttl);
#ifdef USE_TTL
// Have the chip flush reads that seem to be starving for read
// bandwidth ... or we're otherwise reading. Note, Win32 drivers
// may change our read TTL for us.
register_write (dev, REG_TTL,
MK_TTL (NC_READ_TTL, TTL_OTHER (ttl)) );
dbg ("%s: assigned TTL, %d ms", dev->net.name, NC_READ_TTL);
#endif
info ("%s: %s, port %c on USB %d dev %d, peer %sconnected",
dev->net.name, (char *) dev->prod_info->driver_info,
(status & STATUS_PORT_A) ? 'A' : 'B',
dev->udev->bus->busnum,
dev->udev->devnum,
(status & STATUS_CONN_OTHER) ? "" : "dis"
);
retval = 0;
done:
return retval;
}
/*-------------------------------------------------------------------------
*
* Network Device Driver support (peer link to USB Host)
*
--------------------------------------------------------------------------*/
static int net1080_change_mtu (struct net_device *net, int new_mtu)
{
if ((new_mtu < 0) || NC_MAX_PACKET (new_mtu) > MAX_PACKET)
return -EINVAL;
net->mtu = new_mtu;
return 0;
}
/*-------------------------------------------------------------------------*/
static struct net_device_stats *net1080_get_stats (struct net_device *net)
{
return &((struct net1080 *) net->priv)->stats;
}
/*-------------------------------------------------------------------------*/
static void rx_complete (struct urb *urb);
static void rx_submit (struct net1080 *dev, struct urb *urb, int flags)
{
struct sk_buff *skb;
struct skb_data *entry;
int retval = 0;
unsigned long lockflags;
if ((skb = alloc_skb (NC_MAX_PACKET (dev->net.mtu), flags)) == 0) {
err ("no rx skb");
tasklet_schedule (&dev->bh);
usb_free_urb (urb);
return;
}
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = rx_start;
entry->length = 0;
FILL_BULK_URB (urb, dev->udev, usb_rcvbulkpipe (dev->udev, 1),
skb->data, skb->truesize, rx_complete, skb);
urb->transfer_flags |= USB_QUEUE_BULK;
spin_lock_irqsave (&dev->rxq.lock, lockflags);
if (!netif_queue_stopped (&dev->net)) {
if ((retval = usb_submit_urb (urb)) != 0) {
err ("%s rx submit, %d", dev->net.name, retval);
tasklet_schedule (&dev->bh);
} else {
__skb_queue_tail (&dev->rxq, skb);
}
} else {
dbg ("rx: stopped");
retval = -ENOLINK;
}
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
if (retval) {
dev_kfree_skb_any (skb);
usb_free_urb (urb);
}
}
/*-------------------------------------------------------------------------*/
static void rx_complete (struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct net1080 *dev = entry->dev;
int urb_status = urb->status;
urb->dev = 0;
skb->len = urb->actual_length;
entry->state = rx_done;
entry->urb = 0;
if ((urb->transfer_flags & USB_ASYNC_UNLINK) != 0) {
dbg ("rx ... shutting down");
usb_free_urb (urb);
urb = 0;
}
switch (urb_status) {
// success
case 0:
if (!(skb->len & 0x01)) {
entry->state = rx_cleanup;
dev->stats.rx_errors++;
dev->stats.rx_length_errors++;
dbg ("even rx len %d", skb->len);
} else if (skb->len > MAX_PACKET) {
entry->state = rx_cleanup;
dev->stats.rx_errors++;
dev->stats.rx_frame_errors++;
dbg ("rx too big, %d", skb->len);
}
break;
// hardware-reported interface shutdown ... which we
// typically see before khubd calls disconnect()
case -ETIMEDOUT: // usb-ohci
case -EILSEQ: // *uhci ... "crc"/timeout error
// netif_device_detach (&dev->net);
// FALLTHROUGH
// software-driven interface shutdown
case -ECONNRESET:
entry->state = rx_cleanup;
usb_free_urb (urb);
urb = 0;
dbg ("%s ... shutdown rx (%d)", dev->net.name, urb_status);
break;
// data overrun ... flush fifo?
case -EOVERFLOW:
dev->stats.rx_over_errors++;
// FALLTHROUGH
default:
entry->state = rx_cleanup;
dev->stats.rx_errors++;
err ("%s rx: status %d", dev->net.name, urb_status);
break;
}
defer_bh (dev, skb);
if (urb) {
if (!netif_queue_stopped (&dev->net)) {
rx_submit (dev, urb, GFP_ATOMIC);
return;
} else
usb_free_urb (urb);
}
#ifdef VERBOSE
dbg ("no read resubmitted");
#endif /* VERBOSE */
}
/*-------------------------------------------------------------------------*/
// unlink pending rx/tx; completion handlers do all other cleanup
static int unlink_urbs (struct sk_buff_head *q)
{
unsigned long flags;
struct sk_buff *skb;
struct skb_data *entry;
int retval;
int count = 0;
spin_lock_irqsave (&q->lock, flags);
for (skb = q->next; skb != (struct sk_buff *) q; skb = skb->next) {
entry = (struct skb_data *) skb->cb;
entry->urb->transfer_flags |= USB_ASYNC_UNLINK;
retval = usb_unlink_urb (entry->urb);
if (retval < 0)
dbg ("unlink urb err, %d", retval);
else
count++;
}
spin_unlock_irqrestore (&q->lock, flags);
return count;
}
/*-------------------------------------------------------------------------*/
// precondition: never called in_interrupt
static int net1080_stop (struct net_device *net)
{
struct net1080 *dev = (struct net1080 *) net->priv;
int temp;
DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup);
DECLARE_WAITQUEUE (wait, current);
mutex_lock (&dev->mutex);
dbg ("%s stop stats: rx/tx %ld/%ld, errs %ld/%ld", net->name,
dev->stats.rx_packets, dev->stats.tx_packets,
dev->stats.rx_errors, dev->stats.tx_errors
);
netif_stop_queue(net);
// ensure there are no more active urbs
add_wait_queue (&unlink_wakeup, &wait);
dev->wait = &unlink_wakeup;
temp = unlink_urbs (&dev->txq) + unlink_urbs (&dev->rxq);
// maybe wait for deletions to finish.
if (temp) {
current->state = TASK_UNINTERRUPTIBLE;
schedule ();
dbg ("waited for %d urb completions", temp);
}
dev->wait = 0;
current->state = TASK_RUNNING;
remove_wait_queue (&unlink_wakeup, &wait);
mutex_unlock (&dev->mutex);
MOD_DEC_USE_COUNT;
return 0;
}
/*-------------------------------------------------------------------------*/
// posts a read, and enables write queing
// precondition: never called in_interrupt
static int net1080_open (struct net_device *net)
{
struct net1080 *dev = (struct net1080 *) net->priv;
int retval;
u16 status;
int i;
MOD_INC_USE_COUNT;
mutex_lock (&dev->mutex);
// insist peer be connected -- is this the best place?
if ((retval = register_read (dev, REG_STATUS, &status)) != 0) {
dbg ("%s open: status read failed - %d", net->name, retval);
goto done;
}
if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER) {
retval = -ENOLINK;
dbg ("%s open: peer not connected", net->name);
goto done;
}
MOD_INC_USE_COUNT;
netif_start_queue (net);
for (i = 0; i < RX_QLEN; i++)
rx_submit (dev, usb_alloc_urb (0), GFP_KERNEL);
dbg ("%s open: started queueing (rx %d, tx %d)",
net->name, RX_QLEN, TX_QLEN);
done:
mutex_unlock (&dev->mutex);
MOD_DEC_USE_COUNT;
return retval;
}
/*-------------------------------------------------------------------------*/
static void tx_complete (struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct net1080 *dev = entry->dev;
urb->dev = 0;
entry->state = tx_done;
defer_bh (dev, skb);
netif_wake_queue (&dev->net);
}
/*-------------------------------------------------------------------------*/
static struct sk_buff *fixup_skb (struct sk_buff *skb)
{
int padlen;
struct sk_buff *skb2;
padlen = ((skb->len + sizeof (struct nc_header)
+ sizeof (struct nc_trailer)) & 0x01) ? 0 : 1;
if (!skb_cloned (skb)) {
int headroom = skb_headroom (skb);
int tailroom = skb_tailroom (skb);
if ((padlen + sizeof (struct nc_trailer)) <= tailroom
&& sizeof (struct nc_header) <= headroom)
return skb;
if ((sizeof (struct nc_header) + padlen
+ sizeof (struct nc_trailer)) <
(headroom + tailroom)) {
skb->data = memmove (skb->head
+ sizeof (struct nc_header),
skb->data, skb->len);
skb->tail = skb->data + skb->len;
return skb;
}
}
skb2 = skb_copy_expand (skb,
sizeof (struct nc_header),
sizeof (struct nc_trailer) + padlen,
in_interrupt () ? GFP_ATOMIC : GFP_KERNEL);
dev_kfree_skb_any (skb);
return skb2;
}
/*-------------------------------------------------------------------------*/
static int net1080_start_xmit (struct sk_buff *skb, struct net_device *net)
{
struct net1080 *dev = (struct net1080 *) net->priv;
int length = skb->len;
int retval = 0;
struct urb *urb = 0;
struct skb_data *entry;
struct nc_header *header;
struct nc_trailer *trailer;
unsigned long flags;
if ((skb = fixup_skb (skb)) == 0) {
dbg ("can't fixup skb");
goto drop;
}
if ((urb = usb_alloc_urb (0)) == 0) {
dbg ("no urb");
goto drop;
}
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = tx_start;
entry->length = length;
header = (struct nc_header *) skb_push (skb, sizeof *header);
header->hdr_len = cpu_to_le16 (sizeof (*header));
header->packet_len = cpu_to_le16 (length);
if (!((skb->len + sizeof *trailer) & 0x01))
*skb_put (skb, 1) = NC_PAD_BYTE;
trailer = (struct nc_trailer *) skb_put (skb, sizeof *trailer);
FILL_BULK_URB (urb, dev->udev,
usb_sndbulkpipe (dev->udev, 1),
skb->data, skb->len, tx_complete, skb);
urb->transfer_flags |= USB_QUEUE_BULK;
// FIXME urb->timeout = ...;
spin_lock_irqsave (&dev->txq.lock, flags);
if (!netif_queue_stopped (&dev->net)) {
header->packet_id = cpu_to_le16 (dev->packet_id++);
put_unaligned (header->packet_id, &trailer->packet_id);
netif_stop_queue (net);
if ((retval = usb_submit_urb (urb)) != 0) {
netif_start_queue (net);
dbg ("%s tx: submit urb err %d", net->name, retval);
} else {
net->trans_start = jiffies;
__skb_queue_tail (&dev->txq, skb);
if (dev->txq.qlen < TX_QLEN)
netif_start_queue (net);
}
} else
retval = -ENOLINK;
spin_unlock_irqrestore (&dev->txq.lock, flags);
if (retval) {
dbg ("drop");
drop:
dev->stats.tx_dropped++;
dev_kfree_skb_any (skb);
usb_free_urb (urb);
#ifdef VERBOSE
} else {
dbg ("%s: tx %p len %d", net->name, skb, length);
#endif
}
return retval;
}
/*-------------------------------------------------------------------------*/
static void rx_process (struct net1080 *dev, struct sk_buff *skb)
{
struct nc_header *header;
struct nc_trailer *trailer;
header = (struct nc_header *) skb->data;
le16_to_cpus (&header->hdr_len);
le16_to_cpus (&header->packet_len);
if (header->packet_len > MAX_PACKET) {
dev->stats.rx_frame_errors++;
dbg ("packet too big, %d", header->packet_len);
goto error;
} else if (header->hdr_len < NC_MIN_HEADER) {
dev->stats.rx_frame_errors++;
dbg ("header too short, %d", header->hdr_len);
goto error;
} else if (header->hdr_len > header->packet_len) {
dev->stats.rx_frame_errors++;
dbg ("header too big, %d packet %d", header->hdr_len, header->packet_len);
goto error;
} else if (header->hdr_len != sizeof *header) {
// out of band data for us?
dbg ("header OOB, %d bytes", header->hdr_len - NC_MIN_HEADER);
// switch (vendor/product ids) { ... }
}
skb_pull (skb, header->hdr_len);
trailer = (struct nc_trailer *)
(skb->data + skb->len - sizeof *trailer);
skb_trim (skb, skb->len - sizeof *trailer);
if ((header->packet_len & 0x01) == 0) {
if (skb->data [header->packet_len] != NC_PAD_BYTE) {
dev->stats.rx_frame_errors++;
dbg ("bad pad");
goto error;
}
skb_trim (skb, skb->len - 1);
}
if (skb->len != header->packet_len) {
dev->stats.rx_length_errors++;
dbg ("bad packet len %d (expected %d)",
skb->len, header->packet_len);
goto error;
}
if (header->packet_id != get_unaligned (&trailer->packet_id)) {
dev->stats.rx_fifo_errors++;
dbg ("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
header->packet_id, trailer->packet_id);
goto error;
}
if (skb->len) {
skb->dev = &dev->net;
skb->protocol = eth_type_trans (skb, &dev->net);
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
#ifdef VERBOSE
dbg ("%s: rx %p len %d, type 0x%x, id 0x%x",
dev->net.name, skb, skb->len, skb->protocol,
le16_to_cpu (header->packet_id));
#endif
netif_rx (skb);
} else {
dbg ("drop");
error:
dev->stats.rx_errors++;
dev_kfree_skb (skb);
}
}
/*-------------------------------------------------------------------------*/
// tasklet
// We can have a state machine in this tasklet monitor the link state,
// using async control messaging and calling attach/detach routines.
// But then some listener ought to respond to the changes; do those
// network attach/detach notifications get to userland somehow, such
// as by calling "ifup usb0" and "ifdown usb0"?
static void net1080_bh (unsigned long param)
{
struct net1080 *dev = (struct net1080 *) param;
struct sk_buff *skb;
struct skb_data *entry;
while ((skb = skb_dequeue (&dev->done))) {
entry = (struct skb_data *) skb->cb;
switch (entry->state) {
case rx_done:
rx_process (dev, skb);
continue;
case tx_done:
if (entry->urb->status) {
// can this statistic become more specific?
dev->stats.tx_errors++;
dbg ("%s tx: err %d", dev->net.name,
entry->urb->status);
} else {
dev->stats.tx_packets++;
dev->stats.tx_bytes += entry->length;
}
// FALLTHROUGH:
case rx_cleanup:
usb_free_urb (entry->urb);
dev_kfree_skb (skb);
continue;
default:
dbg ("%s: bogus skb state %d",
dev->net.name, entry->state);
}
}
// waiting for all pending urbs to complete?
if (dev->wait) {
if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
wake_up (dev->wait);
}
// or are we maybe short a few urbs?
} else if (!netif_queue_stopped (&dev->net)) {
if (dev->rxq.qlen < TX_QLEN) {
struct urb *urb;
int i;
for (i = 0; i < 3 && dev->rxq.qlen < TX_QLEN; i++) {
if ((urb = usb_alloc_urb (0)) != 0)
rx_submit (dev, urb, GFP_ATOMIC);
}
dbg ("%s: rxqlen now %d",
dev->net.name, dev->rxq.qlen);
}
}
}
/*-------------------------------------------------------------------------
*
* USB Device Driver support
*
--------------------------------------------------------------------------*/
// precondition: never called in_interrupt
static void net1080_disconnect (struct usb_device *udev, void *ptr)
{
struct net1080 *dev = (struct net1080 *) ptr;
info ("%s: USB %d dev %d, %s, disconnected",
dev->net.name,
udev->bus->busnum, udev->devnum,
(char *) dev->prod_info->driver_info);
unregister_netdev (&dev->net);
mutex_lock (&net1080_mutex);
mutex_lock (&dev->mutex);
list_del (&dev->dev_list);
mutex_unlock (&net1080_mutex);
#ifdef DEBUG
memset (dev, 0x55, sizeof *dev);
#endif
kfree (dev);
usb_dec_dev_use (udev);
}
/*-------------------------------------------------------------------------*/
// precondition: never called in_interrupt
static void *
net1080_probe (struct usb_device *udev, unsigned ifnum, const struct usb_device_id *prod)
{
struct net1080 *dev;
struct net_device *net;
struct usb_interface_descriptor *interface;
int retval;
// sanity check; expect dedicated interface/devices for now.
interface = &udev->actconfig->interface [ifnum].altsetting[0];
if (udev->descriptor.bNumConfigurations != 1
|| udev->config[0].bNumInterfaces != 1
|| udev->config[0].bNumInterfaces != 1
|| interface->bInterfaceClass != USB_CLASS_VENDOR_SPEC
|| interface->bNumEndpoints != 5
) {
dbg ("Bogus config info");
return 0;
}
// set up our own records
if (!(dev = kmalloc (sizeof *dev, GFP_KERNEL))) {
dbg ("can't kmalloc dev");
return 0;
}
memset (dev, 0, sizeof *dev);
init_MUTEX_LOCKED (&dev->mutex);
usb_inc_dev_use (udev);
dev->udev = udev;
dev->prod_info = prod;
INIT_LIST_HEAD (&dev->dev_list);
skb_queue_head_init (&dev->rxq);
skb_queue_head_init (&dev->txq);
skb_queue_head_init (&dev->done);
dev->bh.func = net1080_bh;
dev->bh.data = (unsigned long) dev;
// set up network interface records
net = &dev->net;
net->priv = dev;
strcpy (net->name, "usb%d");
memcpy (net->dev_addr, node_id, sizeof node_id);
ether_setup (net);
// net->flags |= IFF_POINTOPOINT;
net->change_mtu = net1080_change_mtu;
net->get_stats = net1080_get_stats;
net->hard_start_xmit = net1080_start_xmit;
net->open = net1080_open;
net->stop = net1080_stop;
register_netdev (&dev->net);
// ... talk to the device
// dump_registers (dev);
if ((retval = net1080_reset (dev)) < 0) {
err ("%s: init reset fail on USB %d dev %d - %d",
dev->net.name, udev->bus->busnum, udev->devnum, retval);
mutex_unlock (&dev->mutex);
net1080_disconnect (udev, dev);
return 0;
}
// ok, it's ready to go.
mutex_lock (&net1080_mutex);
list_add (&dev->dev_list, &net1080_list);
mutex_unlock (&dev->mutex);
// start as if the link is up
netif_device_attach (&dev->net);
mutex_unlock (&net1080_mutex);
return dev;
}
/*-------------------------------------------------------------------------*/
static struct usb_driver net1080_driver = {
name: "net1080",
id_table: products,
probe: net1080_probe,
disconnect: net1080_disconnect,
};
/*-------------------------------------------------------------------------*/
static int __init net1080_init (void)
{
// compiler should optimize this out
if (sizeof (((struct sk_buff *)0)->cb) < sizeof (struct skb_data))
BUG ();
if (usb_register (&net1080_driver) < 0)
return -1;
get_random_bytes (node_id, sizeof node_id);
node_id [0] &= 0x7f;
info(DRIVER_VERSION ":" DRIVER_DESC);
return 0;
}
module_init (net1080_init);
static void __exit net1080_exit (void)
{
usb_deregister (&net1080_driver);
}
module_exit (net1080_exit);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
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