654f31189e
This lets us remove a lot of code in the drivers that were all checking the same thing. It also found some bugs in a few of the drivers, which has been fixed up. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1220 lines
32 KiB
C
1220 lines
32 KiB
C
/*
|
||
* USB Network driver infrastructure
|
||
* Copyright (C) 2000-2005 by David Brownell
|
||
* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
|
||
*
|
||
* 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 of the License, 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.
|
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*
|
||
* 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
|
||
*/
|
||
|
||
/*
|
||
* This is a generic "USB networking" framework that works with several
|
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* kinds of full and high speed networking devices: host-to-host cables,
|
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* smart usb peripherals, and actual Ethernet adapters.
|
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*
|
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* These devices usually differ in terms of control protocols (if they
|
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* even have one!) and sometimes they define new framing to wrap or batch
|
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* Ethernet packets. Otherwise, they talk to USB pretty much the same,
|
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* so interface (un)binding, endpoint I/O queues, fault handling, and other
|
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* issues can usefully be addressed by this framework.
|
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*/
|
||
|
||
// #define DEBUG // error path messages, extra info
|
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// #define VERBOSE // more; success messages
|
||
|
||
#include <linux/config.h>
|
||
#include <linux/module.h>
|
||
#include <linux/sched.h>
|
||
#include <linux/init.h>
|
||
#include <linux/netdevice.h>
|
||
#include <linux/etherdevice.h>
|
||
#include <linux/ethtool.h>
|
||
#include <linux/workqueue.h>
|
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#include <linux/mii.h>
|
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#include <linux/usb.h>
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|
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#include "usbnet.h"
|
||
|
||
#define DRIVER_VERSION "22-Aug-2005"
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
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/*
|
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* Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
|
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* Several dozen bytes of IPv4 data can fit in two such transactions.
|
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* One maximum size Ethernet packet takes twenty four of them.
|
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* For high speed, each frame comfortably fits almost 36 max size
|
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* Ethernet packets (so queues should be bigger).
|
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*
|
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* REVISIT qlens should be members of 'struct usbnet'; the goal is to
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* let the USB host controller be busy for 5msec or more before an irq
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* is required, under load. Jumbograms change the equation.
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*/
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#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
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#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
|
||
|
||
// reawaken network queue this soon after stopping; else watchdog barks
|
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#define TX_TIMEOUT_JIFFIES (5*HZ)
|
||
|
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// throttle rx/tx briefly after some faults, so khubd might disconnect()
|
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// us (it polls at HZ/4 usually) before we report too many false errors.
|
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#define THROTTLE_JIFFIES (HZ/8)
|
||
|
||
// between wakeups
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#define UNLINK_TIMEOUT_MS 3
|
||
|
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/*-------------------------------------------------------------------------*/
|
||
|
||
// randomly generated ethernet address
|
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static u8 node_id [ETH_ALEN];
|
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|
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static const char driver_name [] = "usbnet";
|
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|
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/* use ethtool to change the level for any given device */
|
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static int msg_level = -1;
|
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module_param (msg_level, int, 0);
|
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MODULE_PARM_DESC (msg_level, "Override default message level");
|
||
|
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/*-------------------------------------------------------------------------*/
|
||
|
||
/* handles CDC Ethernet and many other network "bulk data" interfaces */
|
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int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
|
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{
|
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int tmp;
|
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struct usb_host_interface *alt = NULL;
|
||
struct usb_host_endpoint *in = NULL, *out = NULL;
|
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struct usb_host_endpoint *status = NULL;
|
||
|
||
for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
|
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unsigned ep;
|
||
|
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in = out = status = NULL;
|
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alt = intf->altsetting + tmp;
|
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|
||
/* take the first altsetting with in-bulk + out-bulk;
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* remember any status endpoint, just in case;
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* ignore other endpoints and altsetttings.
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*/
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for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
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struct usb_host_endpoint *e;
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int intr = 0;
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|
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e = alt->endpoint + ep;
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switch (e->desc.bmAttributes) {
|
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case USB_ENDPOINT_XFER_INT:
|
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if (!(e->desc.bEndpointAddress & USB_DIR_IN))
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continue;
|
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intr = 1;
|
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/* FALLTHROUGH */
|
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case USB_ENDPOINT_XFER_BULK:
|
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break;
|
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default:
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continue;
|
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}
|
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if (e->desc.bEndpointAddress & USB_DIR_IN) {
|
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if (!intr && !in)
|
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in = e;
|
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else if (intr && !status)
|
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status = e;
|
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} else {
|
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if (!out)
|
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out = e;
|
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}
|
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}
|
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if (in && out)
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break;
|
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}
|
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if (!alt || !in || !out)
|
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return -EINVAL;
|
||
|
||
if (alt->desc.bAlternateSetting != 0
|
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|| !(dev->driver_info->flags & FLAG_NO_SETINT)) {
|
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tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
|
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alt->desc.bAlternateSetting);
|
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if (tmp < 0)
|
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return tmp;
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}
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dev->in = usb_rcvbulkpipe (dev->udev,
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in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
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dev->out = usb_sndbulkpipe (dev->udev,
|
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out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
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dev->status = status;
|
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return 0;
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}
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EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
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static void intr_complete (struct urb *urb, struct pt_regs *regs);
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static int init_status (struct usbnet *dev, struct usb_interface *intf)
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{
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char *buf = NULL;
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unsigned pipe = 0;
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unsigned maxp;
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unsigned period;
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if (!dev->driver_info->status)
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return 0;
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pipe = usb_rcvintpipe (dev->udev,
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dev->status->desc.bEndpointAddress
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& USB_ENDPOINT_NUMBER_MASK);
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maxp = usb_maxpacket (dev->udev, pipe, 0);
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/* avoid 1 msec chatter: min 8 msec poll rate */
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period = max ((int) dev->status->desc.bInterval,
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(dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
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buf = kmalloc (maxp, SLAB_KERNEL);
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if (buf) {
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dev->interrupt = usb_alloc_urb (0, SLAB_KERNEL);
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if (!dev->interrupt) {
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kfree (buf);
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return -ENOMEM;
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} else {
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usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
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buf, maxp, intr_complete, dev, period);
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dev_dbg(&intf->dev,
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"status ep%din, %d bytes period %d\n",
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usb_pipeendpoint(pipe), maxp, period);
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}
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}
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return 0;
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}
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/* Passes this packet up the stack, updating its accounting.
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* Some link protocols batch packets, so their rx_fixup paths
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* can return clones as well as just modify the original skb.
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*/
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void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
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{
|
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int status;
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skb->dev = dev->net;
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skb->protocol = eth_type_trans (skb, dev->net);
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += skb->len;
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if (netif_msg_rx_status (dev))
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devdbg (dev, "< rx, len %zu, type 0x%x",
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skb->len + sizeof (struct ethhdr), skb->protocol);
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memset (skb->cb, 0, sizeof (struct skb_data));
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status = netif_rx (skb);
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if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
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devdbg (dev, "netif_rx status %d", status);
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}
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EXPORT_SYMBOL_GPL(usbnet_skb_return);
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/*-------------------------------------------------------------------------
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*
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* Network Device Driver (peer link to "Host Device", from USB host)
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*
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*-------------------------------------------------------------------------*/
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static int usbnet_change_mtu (struct net_device *net, int new_mtu)
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{
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struct usbnet *dev = netdev_priv(net);
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int ll_mtu = new_mtu + net->hard_header_len;
|
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|
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if (new_mtu <= 0 || ll_mtu > dev->hard_mtu)
|
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return -EINVAL;
|
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// no second zero-length packet read wanted after mtu-sized packets
|
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if ((ll_mtu % dev->maxpacket) == 0)
|
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return -EDOM;
|
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net->mtu = new_mtu;
|
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return 0;
|
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}
|
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|
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/*-------------------------------------------------------------------------*/
|
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|
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static struct net_device_stats *usbnet_get_stats (struct net_device *net)
|
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{
|
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struct usbnet *dev = netdev_priv(net);
|
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return &dev->stats;
|
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}
|
||
|
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/*-------------------------------------------------------------------------*/
|
||
|
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/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
|
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* completion callbacks. 2.5 should have fixed those bugs...
|
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*/
|
||
|
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static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
|
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{
|
||
unsigned long flags;
|
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|
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spin_lock_irqsave(&list->lock, flags);
|
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__skb_unlink(skb, list);
|
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spin_unlock(&list->lock);
|
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spin_lock(&dev->done.lock);
|
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__skb_queue_tail(&dev->done, skb);
|
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if (dev->done.qlen == 1)
|
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tasklet_schedule(&dev->bh);
|
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spin_unlock_irqrestore(&dev->done.lock, flags);
|
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}
|
||
|
||
/* some work can't be done in tasklets, so we use keventd
|
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*
|
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* NOTE: annoying asymmetry: if it's active, schedule_work() fails,
|
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* but tasklet_schedule() doesn't. hope the failure is rare.
|
||
*/
|
||
void usbnet_defer_kevent (struct usbnet *dev, int work)
|
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{
|
||
set_bit (work, &dev->flags);
|
||
if (!schedule_work (&dev->kevent))
|
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deverr (dev, "kevent %d may have been dropped", work);
|
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else
|
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devdbg (dev, "kevent %d scheduled", work);
|
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}
|
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EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void rx_complete (struct urb *urb, struct pt_regs *regs);
|
||
|
||
static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
|
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{
|
||
struct sk_buff *skb;
|
||
struct skb_data *entry;
|
||
int retval = 0;
|
||
unsigned long lockflags;
|
||
size_t size = dev->rx_urb_size;
|
||
|
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if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
|
||
if (netif_msg_rx_err (dev))
|
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devdbg (dev, "no rx skb");
|
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usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
|
||
usb_free_urb (urb);
|
||
return;
|
||
}
|
||
skb_reserve (skb, NET_IP_ALIGN);
|
||
|
||
entry = (struct skb_data *) skb->cb;
|
||
entry->urb = urb;
|
||
entry->dev = dev;
|
||
entry->state = rx_start;
|
||
entry->length = 0;
|
||
|
||
usb_fill_bulk_urb (urb, dev->udev, dev->in,
|
||
skb->data, size, rx_complete, skb);
|
||
|
||
spin_lock_irqsave (&dev->rxq.lock, lockflags);
|
||
|
||
if (netif_running (dev->net)
|
||
&& netif_device_present (dev->net)
|
||
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
|
||
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){
|
||
case -EPIPE:
|
||
usbnet_defer_kevent (dev, EVENT_RX_HALT);
|
||
break;
|
||
case -ENOMEM:
|
||
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
|
||
break;
|
||
case -ENODEV:
|
||
if (netif_msg_ifdown (dev))
|
||
devdbg (dev, "device gone");
|
||
netif_device_detach (dev->net);
|
||
break;
|
||
default:
|
||
if (netif_msg_rx_err (dev))
|
||
devdbg (dev, "rx submit, %d", retval);
|
||
tasklet_schedule (&dev->bh);
|
||
break;
|
||
case 0:
|
||
__skb_queue_tail (&dev->rxq, skb);
|
||
}
|
||
} else {
|
||
if (netif_msg_ifdown (dev))
|
||
devdbg (dev, "rx: stopped");
|
||
retval = -ENOLINK;
|
||
}
|
||
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
|
||
if (retval) {
|
||
dev_kfree_skb_any (skb);
|
||
usb_free_urb (urb);
|
||
}
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
|
||
{
|
||
if (dev->driver_info->rx_fixup
|
||
&& !dev->driver_info->rx_fixup (dev, skb))
|
||
goto error;
|
||
// else network stack removes extra byte if we forced a short packet
|
||
|
||
if (skb->len)
|
||
usbnet_skb_return (dev, skb);
|
||
else {
|
||
if (netif_msg_rx_err (dev))
|
||
devdbg (dev, "drop");
|
||
error:
|
||
dev->stats.rx_errors++;
|
||
skb_queue_tail (&dev->done, skb);
|
||
}
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void rx_complete (struct urb *urb, struct pt_regs *regs)
|
||
{
|
||
struct sk_buff *skb = (struct sk_buff *) urb->context;
|
||
struct skb_data *entry = (struct skb_data *) skb->cb;
|
||
struct usbnet *dev = entry->dev;
|
||
int urb_status = urb->status;
|
||
|
||
skb_put (skb, urb->actual_length);
|
||
entry->state = rx_done;
|
||
entry->urb = NULL;
|
||
|
||
switch (urb_status) {
|
||
// success
|
||
case 0:
|
||
if (skb->len < dev->net->hard_header_len) {
|
||
entry->state = rx_cleanup;
|
||
dev->stats.rx_errors++;
|
||
dev->stats.rx_length_errors++;
|
||
if (netif_msg_rx_err (dev))
|
||
devdbg (dev, "rx length %d", skb->len);
|
||
}
|
||
break;
|
||
|
||
// stalls need manual reset. this is rare ... except that
|
||
// when going through USB 2.0 TTs, unplug appears this way.
|
||
// we avoid the highspeed version of the ETIMEOUT/EILSEQ
|
||
// storm, recovering as needed.
|
||
case -EPIPE:
|
||
dev->stats.rx_errors++;
|
||
usbnet_defer_kevent (dev, EVENT_RX_HALT);
|
||
// FALLTHROUGH
|
||
|
||
// software-driven interface shutdown
|
||
case -ECONNRESET: // async unlink
|
||
case -ESHUTDOWN: // hardware gone
|
||
if (netif_msg_ifdown (dev))
|
||
devdbg (dev, "rx shutdown, code %d", urb_status);
|
||
goto block;
|
||
|
||
// we get controller i/o faults during khubd disconnect() delays.
|
||
// throttle down resubmits, to avoid log floods; just temporarily,
|
||
// so we still recover when the fault isn't a khubd delay.
|
||
case -EPROTO: // ehci
|
||
case -ETIMEDOUT: // ohci
|
||
case -EILSEQ: // uhci
|
||
dev->stats.rx_errors++;
|
||
if (!timer_pending (&dev->delay)) {
|
||
mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
|
||
if (netif_msg_link (dev))
|
||
devdbg (dev, "rx throttle %d", urb_status);
|
||
}
|
||
block:
|
||
entry->state = rx_cleanup;
|
||
entry->urb = urb;
|
||
urb = NULL;
|
||
break;
|
||
|
||
// data overrun ... flush fifo?
|
||
case -EOVERFLOW:
|
||
dev->stats.rx_over_errors++;
|
||
// FALLTHROUGH
|
||
|
||
default:
|
||
entry->state = rx_cleanup;
|
||
dev->stats.rx_errors++;
|
||
if (netif_msg_rx_err (dev))
|
||
devdbg (dev, "rx status %d", urb_status);
|
||
break;
|
||
}
|
||
|
||
defer_bh(dev, skb, &dev->rxq);
|
||
|
||
if (urb) {
|
||
if (netif_running (dev->net)
|
||
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
|
||
rx_submit (dev, urb, GFP_ATOMIC);
|
||
return;
|
||
}
|
||
usb_free_urb (urb);
|
||
}
|
||
if (netif_msg_rx_err (dev))
|
||
devdbg (dev, "no read resubmitted");
|
||
}
|
||
|
||
static void intr_complete (struct urb *urb, struct pt_regs *regs)
|
||
{
|
||
struct usbnet *dev = urb->context;
|
||
int status = urb->status;
|
||
|
||
switch (status) {
|
||
/* success */
|
||
case 0:
|
||
dev->driver_info->status(dev, urb);
|
||
break;
|
||
|
||
/* software-driven interface shutdown */
|
||
case -ENOENT: // urb killed
|
||
case -ESHUTDOWN: // hardware gone
|
||
if (netif_msg_ifdown (dev))
|
||
devdbg (dev, "intr shutdown, code %d", status);
|
||
return;
|
||
|
||
/* NOTE: not throttling like RX/TX, since this endpoint
|
||
* already polls infrequently
|
||
*/
|
||
default:
|
||
devdbg (dev, "intr status %d", status);
|
||
break;
|
||
}
|
||
|
||
if (!netif_running (dev->net))
|
||
return;
|
||
|
||
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
|
||
status = usb_submit_urb (urb, GFP_ATOMIC);
|
||
if (status != 0 && netif_msg_timer (dev))
|
||
deverr(dev, "intr resubmit --> %d", status);
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// unlink pending rx/tx; completion handlers do all other cleanup
|
||
|
||
static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
|
||
{
|
||
unsigned long flags;
|
||
struct sk_buff *skb, *skbnext;
|
||
int count = 0;
|
||
|
||
spin_lock_irqsave (&q->lock, flags);
|
||
for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) {
|
||
struct skb_data *entry;
|
||
struct urb *urb;
|
||
int retval;
|
||
|
||
entry = (struct skb_data *) skb->cb;
|
||
urb = entry->urb;
|
||
skbnext = skb->next;
|
||
|
||
// during some PM-driven resume scenarios,
|
||
// these (async) unlinks complete immediately
|
||
retval = usb_unlink_urb (urb);
|
||
if (retval != -EINPROGRESS && retval != 0)
|
||
devdbg (dev, "unlink urb err, %d", retval);
|
||
else
|
||
count++;
|
||
}
|
||
spin_unlock_irqrestore (&q->lock, flags);
|
||
return count;
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// precondition: never called in_interrupt
|
||
|
||
static int usbnet_stop (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
int temp;
|
||
DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup);
|
||
DECLARE_WAITQUEUE (wait, current);
|
||
|
||
netif_stop_queue (net);
|
||
|
||
if (netif_msg_ifdown (dev))
|
||
devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
|
||
dev->stats.rx_packets, dev->stats.tx_packets,
|
||
dev->stats.rx_errors, dev->stats.tx_errors
|
||
);
|
||
|
||
// ensure there are no more active urbs
|
||
add_wait_queue (&unlink_wakeup, &wait);
|
||
dev->wait = &unlink_wakeup;
|
||
temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
|
||
|
||
// maybe wait for deletions to finish.
|
||
while (!skb_queue_empty(&dev->rxq) &&
|
||
!skb_queue_empty(&dev->txq) &&
|
||
!skb_queue_empty(&dev->done)) {
|
||
msleep(UNLINK_TIMEOUT_MS);
|
||
if (netif_msg_ifdown (dev))
|
||
devdbg (dev, "waited for %d urb completions", temp);
|
||
}
|
||
dev->wait = NULL;
|
||
remove_wait_queue (&unlink_wakeup, &wait);
|
||
|
||
usb_kill_urb(dev->interrupt);
|
||
|
||
/* deferred work (task, timer, softirq) must also stop.
|
||
* can't flush_scheduled_work() until we drop rtnl (later),
|
||
* else workers could deadlock; so make workers a NOP.
|
||
*/
|
||
dev->flags = 0;
|
||
del_timer_sync (&dev->delay);
|
||
tasklet_kill (&dev->bh);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// posts reads, and enables write queuing
|
||
|
||
// precondition: never called in_interrupt
|
||
|
||
static int usbnet_open (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
int retval = 0;
|
||
struct driver_info *info = dev->driver_info;
|
||
|
||
// put into "known safe" state
|
||
if (info->reset && (retval = info->reset (dev)) < 0) {
|
||
if (netif_msg_ifup (dev))
|
||
devinfo (dev,
|
||
"open reset fail (%d) usbnet usb-%s-%s, %s",
|
||
retval,
|
||
dev->udev->bus->bus_name, dev->udev->devpath,
|
||
info->description);
|
||
goto done;
|
||
}
|
||
|
||
// insist peer be connected
|
||
if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
|
||
if (netif_msg_ifup (dev))
|
||
devdbg (dev, "can't open; %d", retval);
|
||
goto done;
|
||
}
|
||
|
||
/* start any status interrupt transfer */
|
||
if (dev->interrupt) {
|
||
retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
|
||
if (retval < 0) {
|
||
if (netif_msg_ifup (dev))
|
||
deverr (dev, "intr submit %d", retval);
|
||
goto done;
|
||
}
|
||
}
|
||
|
||
netif_start_queue (net);
|
||
if (netif_msg_ifup (dev)) {
|
||
char *framing;
|
||
|
||
if (dev->driver_info->flags & FLAG_FRAMING_NC)
|
||
framing = "NetChip";
|
||
else if (dev->driver_info->flags & FLAG_FRAMING_GL)
|
||
framing = "GeneSys";
|
||
else if (dev->driver_info->flags & FLAG_FRAMING_Z)
|
||
framing = "Zaurus";
|
||
else if (dev->driver_info->flags & FLAG_FRAMING_RN)
|
||
framing = "RNDIS";
|
||
else if (dev->driver_info->flags & FLAG_FRAMING_AX)
|
||
framing = "ASIX";
|
||
else
|
||
framing = "simple";
|
||
|
||
devinfo (dev, "open: enable queueing "
|
||
"(rx %d, tx %d) mtu %d %s framing",
|
||
RX_QLEN (dev), TX_QLEN (dev), dev->net->mtu,
|
||
framing);
|
||
}
|
||
|
||
// delay posting reads until we're fully open
|
||
tasklet_schedule (&dev->bh);
|
||
done:
|
||
return retval;
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
/* ethtool methods; minidrivers may need to add some more, but
|
||
* they'll probably want to use this base set.
|
||
*/
|
||
|
||
void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
|
||
/* REVISIT don't always return "usbnet" */
|
||
strncpy (info->driver, driver_name, sizeof info->driver);
|
||
strncpy (info->version, DRIVER_VERSION, sizeof info->version);
|
||
strncpy (info->fw_version, dev->driver_info->description,
|
||
sizeof info->fw_version);
|
||
usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
|
||
|
||
static u32 usbnet_get_link (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
|
||
/* If a check_connect is defined, return its result */
|
||
if (dev->driver_info->check_connect)
|
||
return dev->driver_info->check_connect (dev) == 0;
|
||
|
||
/* Otherwise, say we're up (to avoid breaking scripts) */
|
||
return 1;
|
||
}
|
||
|
||
u32 usbnet_get_msglevel (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
|
||
return dev->msg_enable;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
|
||
|
||
void usbnet_set_msglevel (struct net_device *net, u32 level)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
|
||
dev->msg_enable = level;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
|
||
|
||
/* drivers may override default ethtool_ops in their bind() routine */
|
||
static struct ethtool_ops usbnet_ethtool_ops = {
|
||
.get_drvinfo = usbnet_get_drvinfo,
|
||
.get_link = usbnet_get_link,
|
||
.get_msglevel = usbnet_get_msglevel,
|
||
.set_msglevel = usbnet_set_msglevel,
|
||
};
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
/* work that cannot be done in interrupt context uses keventd.
|
||
*
|
||
* NOTE: with 2.5 we could do more of this using completion callbacks,
|
||
* especially now that control transfers can be queued.
|
||
*/
|
||
static void
|
||
kevent (void *data)
|
||
{
|
||
struct usbnet *dev = data;
|
||
int status;
|
||
|
||
/* usb_clear_halt() needs a thread context */
|
||
if (test_bit (EVENT_TX_HALT, &dev->flags)) {
|
||
unlink_urbs (dev, &dev->txq);
|
||
status = usb_clear_halt (dev->udev, dev->out);
|
||
if (status < 0
|
||
&& status != -EPIPE
|
||
&& status != -ESHUTDOWN) {
|
||
if (netif_msg_tx_err (dev))
|
||
deverr (dev, "can't clear tx halt, status %d",
|
||
status);
|
||
} else {
|
||
clear_bit (EVENT_TX_HALT, &dev->flags);
|
||
if (status != -ESHUTDOWN)
|
||
netif_wake_queue (dev->net);
|
||
}
|
||
}
|
||
if (test_bit (EVENT_RX_HALT, &dev->flags)) {
|
||
unlink_urbs (dev, &dev->rxq);
|
||
status = usb_clear_halt (dev->udev, dev->in);
|
||
if (status < 0
|
||
&& status != -EPIPE
|
||
&& status != -ESHUTDOWN) {
|
||
if (netif_msg_rx_err (dev))
|
||
deverr (dev, "can't clear rx halt, status %d",
|
||
status);
|
||
} else {
|
||
clear_bit (EVENT_RX_HALT, &dev->flags);
|
||
tasklet_schedule (&dev->bh);
|
||
}
|
||
}
|
||
|
||
/* tasklet could resubmit itself forever if memory is tight */
|
||
if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
|
||
struct urb *urb = NULL;
|
||
|
||
if (netif_running (dev->net))
|
||
urb = usb_alloc_urb (0, GFP_KERNEL);
|
||
else
|
||
clear_bit (EVENT_RX_MEMORY, &dev->flags);
|
||
if (urb != NULL) {
|
||
clear_bit (EVENT_RX_MEMORY, &dev->flags);
|
||
rx_submit (dev, urb, GFP_KERNEL);
|
||
tasklet_schedule (&dev->bh);
|
||
}
|
||
}
|
||
|
||
if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
|
||
struct driver_info *info = dev->driver_info;
|
||
int retval = 0;
|
||
|
||
clear_bit (EVENT_LINK_RESET, &dev->flags);
|
||
if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
|
||
devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
|
||
retval,
|
||
dev->udev->bus->bus_name, dev->udev->devpath,
|
||
info->description);
|
||
}
|
||
}
|
||
|
||
if (dev->flags)
|
||
devdbg (dev, "kevent done, flags = 0x%lx",
|
||
dev->flags);
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void tx_complete (struct urb *urb, struct pt_regs *regs)
|
||
{
|
||
struct sk_buff *skb = (struct sk_buff *) urb->context;
|
||
struct skb_data *entry = (struct skb_data *) skb->cb;
|
||
struct usbnet *dev = entry->dev;
|
||
|
||
if (urb->status == 0) {
|
||
dev->stats.tx_packets++;
|
||
dev->stats.tx_bytes += entry->length;
|
||
} else {
|
||
dev->stats.tx_errors++;
|
||
|
||
switch (urb->status) {
|
||
case -EPIPE:
|
||
usbnet_defer_kevent (dev, EVENT_TX_HALT);
|
||
break;
|
||
|
||
/* software-driven interface shutdown */
|
||
case -ECONNRESET: // async unlink
|
||
case -ESHUTDOWN: // hardware gone
|
||
break;
|
||
|
||
// like rx, tx gets controller i/o faults during khubd delays
|
||
// and so it uses the same throttling mechanism.
|
||
case -EPROTO: // ehci
|
||
case -ETIMEDOUT: // ohci
|
||
case -EILSEQ: // uhci
|
||
if (!timer_pending (&dev->delay)) {
|
||
mod_timer (&dev->delay,
|
||
jiffies + THROTTLE_JIFFIES);
|
||
if (netif_msg_link (dev))
|
||
devdbg (dev, "tx throttle %d",
|
||
urb->status);
|
||
}
|
||
netif_stop_queue (dev->net);
|
||
break;
|
||
default:
|
||
if (netif_msg_tx_err (dev))
|
||
devdbg (dev, "tx err %d", entry->urb->status);
|
||
break;
|
||
}
|
||
}
|
||
|
||
urb->dev = NULL;
|
||
entry->state = tx_done;
|
||
defer_bh(dev, skb, &dev->txq);
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void usbnet_tx_timeout (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
|
||
unlink_urbs (dev, &dev->txq);
|
||
tasklet_schedule (&dev->bh);
|
||
|
||
// FIXME: device recovery -- reset?
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
int length;
|
||
int retval = NET_XMIT_SUCCESS;
|
||
struct urb *urb = NULL;
|
||
struct skb_data *entry;
|
||
struct driver_info *info = dev->driver_info;
|
||
unsigned long flags;
|
||
|
||
// some devices want funky USB-level framing, for
|
||
// win32 driver (usually) and/or hardware quirks
|
||
if (info->tx_fixup) {
|
||
skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
|
||
if (!skb) {
|
||
if (netif_msg_tx_err (dev))
|
||
devdbg (dev, "can't tx_fixup skb");
|
||
goto drop;
|
||
}
|
||
}
|
||
length = skb->len;
|
||
|
||
if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
|
||
if (netif_msg_tx_err (dev))
|
||
devdbg (dev, "no urb");
|
||
goto drop;
|
||
}
|
||
|
||
entry = (struct skb_data *) skb->cb;
|
||
entry->urb = urb;
|
||
entry->dev = dev;
|
||
entry->state = tx_start;
|
||
entry->length = length;
|
||
|
||
usb_fill_bulk_urb (urb, dev->udev, dev->out,
|
||
skb->data, skb->len, tx_complete, skb);
|
||
|
||
/* don't assume the hardware handles USB_ZERO_PACKET
|
||
* NOTE: strictly conforming cdc-ether devices should expect
|
||
* the ZLP here, but ignore the one-byte packet.
|
||
*
|
||
* FIXME zero that byte, if it doesn't require a new skb.
|
||
*/
|
||
if ((length % dev->maxpacket) == 0)
|
||
urb->transfer_buffer_length++;
|
||
|
||
spin_lock_irqsave (&dev->txq.lock, flags);
|
||
|
||
switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
|
||
case -EPIPE:
|
||
netif_stop_queue (net);
|
||
usbnet_defer_kevent (dev, EVENT_TX_HALT);
|
||
break;
|
||
default:
|
||
if (netif_msg_tx_err (dev))
|
||
devdbg (dev, "tx: submit urb err %d", retval);
|
||
break;
|
||
case 0:
|
||
net->trans_start = jiffies;
|
||
__skb_queue_tail (&dev->txq, skb);
|
||
if (dev->txq.qlen >= TX_QLEN (dev))
|
||
netif_stop_queue (net);
|
||
}
|
||
spin_unlock_irqrestore (&dev->txq.lock, flags);
|
||
|
||
if (retval) {
|
||
if (netif_msg_tx_err (dev))
|
||
devdbg (dev, "drop, code %d", retval);
|
||
drop:
|
||
retval = NET_XMIT_SUCCESS;
|
||
dev->stats.tx_dropped++;
|
||
if (skb)
|
||
dev_kfree_skb_any (skb);
|
||
usb_free_urb (urb);
|
||
} else if (netif_msg_tx_queued (dev)) {
|
||
devdbg (dev, "> tx, len %d, type 0x%x",
|
||
length, skb->protocol);
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// tasklet (work deferred from completions, in_irq) or timer
|
||
|
||
static void usbnet_bh (unsigned long param)
|
||
{
|
||
struct usbnet *dev = (struct usbnet *) 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:
|
||
entry->state = rx_cleanup;
|
||
rx_process (dev, skb);
|
||
continue;
|
||
case tx_done:
|
||
case rx_cleanup:
|
||
usb_free_urb (entry->urb);
|
||
dev_kfree_skb (skb);
|
||
continue;
|
||
default:
|
||
devdbg (dev, "bogus skb state %d", 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_running (dev->net)
|
||
&& netif_device_present (dev->net)
|
||
&& !timer_pending (&dev->delay)
|
||
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
|
||
int temp = dev->rxq.qlen;
|
||
int qlen = RX_QLEN (dev);
|
||
|
||
if (temp < qlen) {
|
||
struct urb *urb;
|
||
int i;
|
||
|
||
// don't refill the queue all at once
|
||
for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
|
||
urb = usb_alloc_urb (0, GFP_ATOMIC);
|
||
if (urb != NULL)
|
||
rx_submit (dev, urb, GFP_ATOMIC);
|
||
}
|
||
if (temp != dev->rxq.qlen && netif_msg_link (dev))
|
||
devdbg (dev, "rxqlen %d --> %d",
|
||
temp, dev->rxq.qlen);
|
||
if (dev->rxq.qlen < qlen)
|
||
tasklet_schedule (&dev->bh);
|
||
}
|
||
if (dev->txq.qlen < TX_QLEN (dev))
|
||
netif_wake_queue (dev->net);
|
||
}
|
||
}
|
||
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
*
|
||
* USB Device Driver support
|
||
*
|
||
*-------------------------------------------------------------------------*/
|
||
|
||
// precondition: never called in_interrupt
|
||
|
||
void usbnet_disconnect (struct usb_interface *intf)
|
||
{
|
||
struct usbnet *dev;
|
||
struct usb_device *xdev;
|
||
struct net_device *net;
|
||
|
||
dev = usb_get_intfdata(intf);
|
||
usb_set_intfdata(intf, NULL);
|
||
if (!dev)
|
||
return;
|
||
|
||
xdev = interface_to_usbdev (intf);
|
||
|
||
if (netif_msg_probe (dev))
|
||
devinfo (dev, "unregister '%s' usb-%s-%s, %s",
|
||
intf->dev.driver->name,
|
||
xdev->bus->bus_name, xdev->devpath,
|
||
dev->driver_info->description);
|
||
|
||
net = dev->net;
|
||
unregister_netdev (net);
|
||
|
||
/* we don't hold rtnl here ... */
|
||
flush_scheduled_work ();
|
||
|
||
if (dev->driver_info->unbind)
|
||
dev->driver_info->unbind (dev, intf);
|
||
|
||
free_netdev(net);
|
||
usb_put_dev (xdev);
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_disconnect);
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// precondition: never called in_interrupt
|
||
|
||
int
|
||
usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
|
||
{
|
||
struct usbnet *dev;
|
||
struct net_device *net;
|
||
struct usb_host_interface *interface;
|
||
struct driver_info *info;
|
||
struct usb_device *xdev;
|
||
int status;
|
||
|
||
info = (struct driver_info *) prod->driver_info;
|
||
if (!info) {
|
||
dev_dbg (&udev->dev, "blacklisted by %s\n", driver_name);
|
||
return -ENODEV;
|
||
}
|
||
xdev = interface_to_usbdev (udev);
|
||
interface = udev->cur_altsetting;
|
||
|
||
usb_get_dev (xdev);
|
||
|
||
status = -ENOMEM;
|
||
|
||
// set up our own records
|
||
net = alloc_etherdev(sizeof(*dev));
|
||
if (!net) {
|
||
dbg ("can't kmalloc dev");
|
||
goto out;
|
||
}
|
||
|
||
dev = netdev_priv(net);
|
||
dev->udev = xdev;
|
||
dev->driver_info = info;
|
||
dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
|
||
| NETIF_MSG_PROBE | NETIF_MSG_LINK);
|
||
skb_queue_head_init (&dev->rxq);
|
||
skb_queue_head_init (&dev->txq);
|
||
skb_queue_head_init (&dev->done);
|
||
dev->bh.func = usbnet_bh;
|
||
dev->bh.data = (unsigned long) dev;
|
||
INIT_WORK (&dev->kevent, kevent, dev);
|
||
dev->delay.function = usbnet_bh;
|
||
dev->delay.data = (unsigned long) dev;
|
||
init_timer (&dev->delay);
|
||
|
||
SET_MODULE_OWNER (net);
|
||
dev->net = net;
|
||
strcpy (net->name, "usb%d");
|
||
memcpy (net->dev_addr, node_id, sizeof node_id);
|
||
|
||
/* rx and tx sides can use different message sizes;
|
||
* bind() should set rx_urb_size in that case.
|
||
*/
|
||
dev->hard_mtu = net->mtu + net->hard_header_len;
|
||
#if 0
|
||
// dma_supported() is deeply broken on almost all architectures
|
||
// possible with some EHCI controllers
|
||
if (dma_supported (&udev->dev, DMA_64BIT_MASK))
|
||
net->features |= NETIF_F_HIGHDMA;
|
||
#endif
|
||
|
||
net->change_mtu = usbnet_change_mtu;
|
||
net->get_stats = usbnet_get_stats;
|
||
net->hard_start_xmit = usbnet_start_xmit;
|
||
net->open = usbnet_open;
|
||
net->stop = usbnet_stop;
|
||
net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
|
||
net->tx_timeout = usbnet_tx_timeout;
|
||
net->ethtool_ops = &usbnet_ethtool_ops;
|
||
|
||
// allow device-specific bind/init procedures
|
||
// NOTE net->name still not usable ...
|
||
if (info->bind) {
|
||
status = info->bind (dev, udev);
|
||
// heuristic: "usb%d" for links we know are two-host,
|
||
// else "eth%d" when there's reasonable doubt. userspace
|
||
// can rename the link if it knows better.
|
||
if ((dev->driver_info->flags & FLAG_ETHER) != 0
|
||
&& (net->dev_addr [0] & 0x02) == 0)
|
||
strcpy (net->name, "eth%d");
|
||
|
||
/* maybe the remote can't receive an Ethernet MTU */
|
||
if (net->mtu > (dev->hard_mtu - net->hard_header_len))
|
||
net->mtu = dev->hard_mtu - net->hard_header_len;
|
||
} else if (!info->in || !info->out)
|
||
status = usbnet_get_endpoints (dev, udev);
|
||
else {
|
||
dev->in = usb_rcvbulkpipe (xdev, info->in);
|
||
dev->out = usb_sndbulkpipe (xdev, info->out);
|
||
if (!(info->flags & FLAG_NO_SETINT))
|
||
status = usb_set_interface (xdev,
|
||
interface->desc.bInterfaceNumber,
|
||
interface->desc.bAlternateSetting);
|
||
else
|
||
status = 0;
|
||
|
||
}
|
||
if (status == 0 && dev->status)
|
||
status = init_status (dev, udev);
|
||
if (status < 0)
|
||
goto out1;
|
||
|
||
if (!dev->rx_urb_size)
|
||
dev->rx_urb_size = dev->hard_mtu;
|
||
dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
|
||
|
||
SET_NETDEV_DEV(net, &udev->dev);
|
||
status = register_netdev (net);
|
||
if (status)
|
||
goto out3;
|
||
if (netif_msg_probe (dev))
|
||
devinfo (dev, "register '%s' at usb-%s-%s, %s, "
|
||
"%02x:%02x:%02x:%02x:%02x:%02x",
|
||
udev->dev.driver->name,
|
||
xdev->bus->bus_name, xdev->devpath,
|
||
dev->driver_info->description,
|
||
net->dev_addr [0], net->dev_addr [1],
|
||
net->dev_addr [2], net->dev_addr [3],
|
||
net->dev_addr [4], net->dev_addr [5]);
|
||
|
||
// ok, it's ready to go.
|
||
usb_set_intfdata (udev, dev);
|
||
|
||
// start as if the link is up
|
||
netif_device_attach (net);
|
||
|
||
return 0;
|
||
|
||
out3:
|
||
if (info->unbind)
|
||
info->unbind (dev, udev);
|
||
out1:
|
||
free_netdev(net);
|
||
out:
|
||
usb_put_dev(xdev);
|
||
return status;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_probe);
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
/* FIXME these suspend/resume methods assume non-CDC style
|
||
* devices, with only one interface.
|
||
*/
|
||
|
||
int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
|
||
{
|
||
struct usbnet *dev = usb_get_intfdata(intf);
|
||
|
||
/* accelerate emptying of the rx and queues, to avoid
|
||
* having everything error out.
|
||
*/
|
||
netif_device_detach (dev->net);
|
||
(void) unlink_urbs (dev, &dev->rxq);
|
||
(void) unlink_urbs (dev, &dev->txq);
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_suspend);
|
||
|
||
int usbnet_resume (struct usb_interface *intf)
|
||
{
|
||
struct usbnet *dev = usb_get_intfdata(intf);
|
||
|
||
netif_device_attach (dev->net);
|
||
tasklet_schedule (&dev->bh);
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_resume);
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static int __init usbnet_init(void)
|
||
{
|
||
/* compiler should optimize this out */
|
||
BUG_ON (sizeof (((struct sk_buff *)0)->cb)
|
||
< sizeof (struct skb_data));
|
||
|
||
random_ether_addr(node_id);
|
||
return 0;
|
||
}
|
||
module_init(usbnet_init);
|
||
|
||
static void __exit usbnet_exit(void)
|
||
{
|
||
}
|
||
module_exit(usbnet_exit);
|
||
|
||
MODULE_AUTHOR("David Brownell");
|
||
MODULE_DESCRIPTION("USB network driver framework");
|
||
MODULE_LICENSE("GPL");
|