f070693009
you seem to have applied the original, not the new improved one with whiter teeth that uses kcalloc instead of kmalloc + memset. Here's a patch that goes on top of the one you applied. Signed-off-by: Duncan Sands <baldrick@free.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1230 lines
32 KiB
C
1230 lines
32 KiB
C
/******************************************************************************
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* usbatm.c - Generic USB xDSL driver core
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*
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* Copyright (C) 2001, Alcatel
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* Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
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* Copyright (C) 2004, David Woodhouse, Roman Kagan
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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/*
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* Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
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*
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* 1.7+: - See the check-in logs
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*
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* 1.6: - No longer opens a connection if the firmware is not loaded
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* - Added support for the speedtouch 330
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* - Removed the limit on the number of devices
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* - Module now autoloads on device plugin
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* - Merged relevant parts of sarlib
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* - Replaced the kernel thread with a tasklet
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* - New packet transmission code
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* - Changed proc file contents
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* - Fixed all known SMP races
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* - Many fixes and cleanups
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* - Various fixes by Oliver Neukum (oliver@neukum.name)
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*
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* 1.5A: - Version for inclusion in 2.5 series kernel
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* - Modifications by Richard Purdie (rpurdie@rpsys.net)
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* - made compatible with kernel 2.5.6 onwards by changing
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* usbatm_usb_send_data_context->urb to a pointer and adding code
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* to alloc and free it
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* - remove_wait_queue() added to usbatm_atm_processqueue_thread()
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*
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* 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
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* (reported by stephen.robinson@zen.co.uk)
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*
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* 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
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* - unlink all active send urbs of a vcc that is being closed.
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*
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* 1.3.1: - added the version number
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*
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* 1.3: - Added multiple send urb support
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* - fixed memory leak and vcc->tx_inuse starvation bug
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* when not enough memory left in vcc.
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*
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* 1.2: - Fixed race condition in usbatm_usb_send_data()
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* 1.1: - Turned off packet debugging
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*
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*/
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#include "usbatm.h"
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#include <asm/uaccess.h>
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#include <linux/crc32.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/stat.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#ifdef VERBOSE_DEBUG
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static int usbatm_print_packet(const unsigned char *data, int len);
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#define PACKETDEBUG(arg...) usbatm_print_packet (arg)
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#define vdbg(arg...) dbg (arg)
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#else
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#define PACKETDEBUG(arg...)
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#define vdbg(arg...)
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#endif
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#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
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#define DRIVER_VERSION "1.9"
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#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
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static const char usbatm_driver_name[] = "usbatm";
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#define UDSL_MAX_RCV_URBS 16
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#define UDSL_MAX_SND_URBS 16
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#define UDSL_MAX_RCV_BUF_SIZE 1024 /* ATM cells */
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#define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */
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#define UDSL_DEFAULT_RCV_URBS 4
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#define UDSL_DEFAULT_SND_URBS 4
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#define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */
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#define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */
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#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
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#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
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static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
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static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
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static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
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static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
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module_param(num_rcv_urbs, uint, S_IRUGO);
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MODULE_PARM_DESC(num_rcv_urbs,
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"Number of urbs used for reception (range: 0-"
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__MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
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module_param(num_snd_urbs, uint, S_IRUGO);
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MODULE_PARM_DESC(num_snd_urbs,
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"Number of urbs used for transmission (range: 0-"
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__MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
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module_param(rcv_buf_size, uint, S_IRUGO);
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MODULE_PARM_DESC(rcv_buf_size,
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"Size of the buffers used for reception in ATM cells (range: 1-"
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__MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
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module_param(snd_buf_size, uint, S_IRUGO);
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MODULE_PARM_DESC(snd_buf_size,
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"Size of the buffers used for transmission in ATM cells (range: 1-"
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__MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
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/* receive */
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struct usbatm_vcc_data {
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/* vpi/vci lookup */
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struct list_head list;
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short vpi;
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int vci;
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struct atm_vcc *vcc;
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/* raw cell reassembly */
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struct sk_buff *sarb;
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};
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/* send */
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struct usbatm_control {
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struct atm_skb_data atm;
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u32 len;
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u32 crc;
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};
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#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
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/* ATM */
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static void usbatm_atm_dev_close(struct atm_dev *dev);
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static int usbatm_atm_open(struct atm_vcc *vcc);
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static void usbatm_atm_close(struct atm_vcc *vcc);
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static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
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static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
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static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
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static struct atmdev_ops usbatm_atm_devops = {
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.dev_close = usbatm_atm_dev_close,
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.open = usbatm_atm_open,
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.close = usbatm_atm_close,
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.ioctl = usbatm_atm_ioctl,
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.send = usbatm_atm_send,
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.proc_read = usbatm_atm_proc_read,
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.owner = THIS_MODULE,
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};
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/***********
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** misc **
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***********/
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static inline unsigned int usbatm_pdu_length(unsigned int length)
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{
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length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
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return length - length % ATM_CELL_PAYLOAD;
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}
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static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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if (vcc->pop)
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vcc->pop(vcc, skb);
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else
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dev_kfree_skb(skb);
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}
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/***********
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** urbs **
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************/
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static inline struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
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{
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struct urb *urb;
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spin_lock_irq(&channel->lock);
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if (list_empty(&channel->list)) {
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spin_unlock_irq(&channel->lock);
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return NULL;
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}
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urb = list_entry(channel->list.next, struct urb, urb_list);
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list_del(&urb->urb_list);
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spin_unlock_irq(&channel->lock);
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return urb;
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}
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static inline int usbatm_submit_urb(struct urb *urb)
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{
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struct usbatm_channel *channel = urb->context;
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int ret;
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vdbg("%s: submitting urb 0x%p, size %u",
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__func__, urb, urb->transfer_buffer_length);
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret) {
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atm_dbg(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
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__func__, urb, ret);
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/* consider all errors transient and return the buffer back to the queue */
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urb->status = -EAGAIN;
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spin_lock_irq(&channel->lock);
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/* must add to the front when sending; doesn't matter when receiving */
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list_add(&urb->urb_list, &channel->list);
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spin_unlock_irq(&channel->lock);
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/* make sure the channel doesn't stall */
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mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
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}
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return ret;
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}
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static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
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{
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struct usbatm_channel *channel = urb->context;
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unsigned long flags;
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vdbg("%s: urb 0x%p, status %d, actual_length %d",
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__func__, urb, urb->status, urb->actual_length);
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/* usually in_interrupt(), but not always */
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spin_lock_irqsave(&channel->lock, flags);
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/* must add to the back when receiving; doesn't matter when sending */
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list_add_tail(&urb->urb_list, &channel->list);
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spin_unlock_irqrestore(&channel->lock, flags);
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if (unlikely(urb->status))
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/* throttle processing in case of an error */
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mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
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else
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tasklet_schedule(&channel->tasklet);
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}
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/*************
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** decode **
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*************/
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static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
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short vpi, int vci)
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{
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struct usbatm_vcc_data *vcc;
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list_for_each_entry(vcc, &instance->vcc_list, list)
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if ((vcc->vci == vci) && (vcc->vpi == vpi))
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return vcc;
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return NULL;
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}
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static void usbatm_extract_cells(struct usbatm_data *instance,
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unsigned char *source, unsigned int avail_data)
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{
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struct usbatm_vcc_data *cached_vcc = NULL;
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struct atm_vcc *vcc;
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struct sk_buff *sarb;
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unsigned int stride = instance->rx_channel.stride;
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int vci, cached_vci = 0;
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short vpi, cached_vpi = 0;
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u8 pti;
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for (; avail_data >= stride; avail_data -= stride, source += stride) {
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vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
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vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
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pti = ((source[3] & 0xe) >> 1);
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vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
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if ((vci != cached_vci) || (vpi != cached_vpi)) {
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cached_vpi = vpi;
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cached_vci = vci;
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cached_vcc = usbatm_find_vcc(instance, vpi, vci);
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if (!cached_vcc)
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atm_dbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
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}
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if (!cached_vcc)
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continue;
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vcc = cached_vcc->vcc;
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/* OAM F5 end-to-end */
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if (pti == ATM_PTI_E2EF5) {
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atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", __func__, vpi, vci);
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atomic_inc(&vcc->stats->rx_err);
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continue;
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}
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sarb = cached_vcc->sarb;
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if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
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atm_dbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
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__func__, sarb->len, vcc);
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/* discard cells already received */
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skb_trim(sarb, 0);
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UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
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}
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memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
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__skb_put(sarb, ATM_CELL_PAYLOAD);
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if (pti & 1) {
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struct sk_buff *skb;
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unsigned int length;
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unsigned int pdu_length;
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length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
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/* guard against overflow */
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if (length > ATM_MAX_AAL5_PDU) {
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atm_dbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
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__func__, length, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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pdu_length = usbatm_pdu_length(length);
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if (sarb->len < pdu_length) {
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atm_dbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
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__func__, pdu_length, sarb->len, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
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atm_dbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
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__func__, vcc);
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atomic_inc(&vcc->stats->rx_err);
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goto out;
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}
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vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
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|
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if (!(skb = dev_alloc_skb(length))) {
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atm_dbg(instance, "%s: no memory for skb (length: %u)!\n", __func__, length);
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atomic_inc(&vcc->stats->rx_drop);
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goto out;
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}
|
|
|
|
vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
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|
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if (!atm_charge(vcc, skb->truesize)) {
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atm_dbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", __func__, skb->truesize);
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dev_kfree_skb(skb);
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goto out; /* atm_charge increments rx_drop */
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}
|
|
|
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memcpy(skb->data, sarb->tail - pdu_length, length);
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__skb_put(skb, length);
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|
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vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
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__func__, skb, skb->len, skb->truesize);
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|
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PACKETDEBUG(skb->data, skb->len);
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|
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vcc->push(vcc, skb);
|
|
|
|
atomic_inc(&vcc->stats->rx);
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out:
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skb_trim(sarb, 0);
|
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}
|
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}
|
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}
|
|
|
|
|
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/*************
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** encode **
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*************/
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|
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static unsigned int usbatm_write_cells(struct usbatm_data *instance,
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struct sk_buff *skb,
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u8 *target, unsigned int avail_space)
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{
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struct usbatm_control *ctrl = UDSL_SKB(skb);
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struct atm_vcc *vcc = ctrl->atm.vcc;
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unsigned int num_written;
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unsigned int stride = instance->tx_channel.stride;
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|
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vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
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UDSL_ASSERT(!(avail_space % stride));
|
|
|
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for (num_written = 0; num_written < avail_space && ctrl->len;
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num_written += stride, target += stride) {
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unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
|
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unsigned int left = ATM_CELL_PAYLOAD - data_len;
|
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u8 *ptr = target;
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ptr[0] = vcc->vpi >> 4;
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ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
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ptr[2] = vcc->vci >> 4;
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ptr[3] = vcc->vci << 4;
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ptr[4] = 0xec;
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ptr += ATM_CELL_HEADER;
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memcpy(ptr, skb->data, data_len);
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ptr += data_len;
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__skb_pull(skb, data_len);
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|
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if(!left)
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continue;
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|
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memset(ptr, 0, left);
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|
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if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
|
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u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
|
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/* trailer[0] = 0; UU = 0 */
|
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/* trailer[1] = 0; CPI = 0 */
|
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trailer[2] = ctrl->len >> 8;
|
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trailer[3] = ctrl->len;
|
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|
|
ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
|
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|
|
trailer[4] = ctrl->crc >> 24;
|
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trailer[5] = ctrl->crc >> 16;
|
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trailer[6] = ctrl->crc >> 8;
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trailer[7] = ctrl->crc;
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|
|
target[3] |= 0x2; /* adjust PTI */
|
|
|
|
ctrl->len = 0; /* tag this skb finished */
|
|
}
|
|
else
|
|
ctrl->crc = crc32_be(ctrl->crc, ptr, left);
|
|
}
|
|
|
|
return num_written;
|
|
}
|
|
|
|
|
|
/**************
|
|
** receive **
|
|
**************/
|
|
|
|
static void usbatm_rx_process(unsigned long data)
|
|
{
|
|
struct usbatm_data *instance = (struct usbatm_data *)data;
|
|
struct urb *urb;
|
|
|
|
while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
|
|
vdbg("%s: processing urb 0x%p", __func__, urb);
|
|
|
|
if (usb_pipeisoc(urb->pipe)) {
|
|
int i;
|
|
for (i = 0; i < urb->number_of_packets; i++)
|
|
if (!urb->iso_frame_desc[i].status)
|
|
usbatm_extract_cells(instance,
|
|
(u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
|
|
urb->iso_frame_desc[i].actual_length);
|
|
}
|
|
else
|
|
if (!urb->status)
|
|
usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
|
|
|
|
if (usbatm_submit_urb(urb))
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/***********
|
|
** send **
|
|
***********/
|
|
|
|
static void usbatm_tx_process(unsigned long data)
|
|
{
|
|
struct usbatm_data *instance = (struct usbatm_data *)data;
|
|
struct sk_buff *skb = instance->current_skb;
|
|
struct urb *urb = NULL;
|
|
const unsigned int buf_size = instance->tx_channel.buf_size;
|
|
unsigned int num_written = 0;
|
|
u8 *buffer = NULL;
|
|
|
|
if (!skb)
|
|
skb = skb_dequeue(&instance->sndqueue);
|
|
|
|
while (skb) {
|
|
if (!urb) {
|
|
urb = usbatm_pop_urb(&instance->tx_channel);
|
|
if (!urb)
|
|
break; /* no more senders */
|
|
buffer = urb->transfer_buffer;
|
|
num_written = (urb->status == -EAGAIN) ?
|
|
urb->transfer_buffer_length : 0;
|
|
}
|
|
|
|
num_written += usbatm_write_cells(instance, skb,
|
|
buffer + num_written,
|
|
buf_size - num_written);
|
|
|
|
vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
|
|
__func__, num_written, skb, urb);
|
|
|
|
if (!UDSL_SKB(skb)->len) {
|
|
struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
|
|
|
|
usbatm_pop(vcc, skb);
|
|
atomic_inc(&vcc->stats->tx);
|
|
|
|
skb = skb_dequeue(&instance->sndqueue);
|
|
}
|
|
|
|
if (num_written == buf_size || (!skb && num_written)) {
|
|
urb->transfer_buffer_length = num_written;
|
|
|
|
if (usbatm_submit_urb(urb))
|
|
break;
|
|
urb = NULL;
|
|
}
|
|
}
|
|
|
|
instance->current_skb = skb;
|
|
}
|
|
|
|
static void usbatm_cancel_send(struct usbatm_data *instance,
|
|
struct atm_vcc *vcc)
|
|
{
|
|
struct sk_buff *skb, *n;
|
|
|
|
atm_dbg(instance, "%s entered\n", __func__);
|
|
spin_lock_irq(&instance->sndqueue.lock);
|
|
for (skb = instance->sndqueue.next, n = skb->next;
|
|
skb != (struct sk_buff *)&instance->sndqueue;
|
|
skb = n, n = skb->next)
|
|
if (UDSL_SKB(skb)->atm.vcc == vcc) {
|
|
atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
|
|
__skb_unlink(skb, &instance->sndqueue);
|
|
usbatm_pop(vcc, skb);
|
|
}
|
|
spin_unlock_irq(&instance->sndqueue.lock);
|
|
|
|
tasklet_disable(&instance->tx_channel.tasklet);
|
|
if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
|
|
atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
|
|
instance->current_skb = NULL;
|
|
usbatm_pop(vcc, skb);
|
|
}
|
|
tasklet_enable(&instance->tx_channel.tasklet);
|
|
atm_dbg(instance, "%s done\n", __func__);
|
|
}
|
|
|
|
static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_control *ctrl = UDSL_SKB(skb);
|
|
int err;
|
|
|
|
vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
|
|
|
|
if (!instance) {
|
|
dbg("%s: NULL data!", __func__);
|
|
err = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
if (vcc->qos.aal != ATM_AAL5) {
|
|
atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (skb->len > ATM_MAX_AAL5_PDU) {
|
|
atm_dbg(instance, "%s: packet too long (%d vs %d)!\n",
|
|
__func__, skb->len, ATM_MAX_AAL5_PDU);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
PACKETDEBUG(skb->data, skb->len);
|
|
|
|
/* initialize the control block */
|
|
ctrl->atm.vcc = vcc;
|
|
ctrl->len = skb->len;
|
|
ctrl->crc = crc32_be(~0, skb->data, skb->len);
|
|
|
|
skb_queue_tail(&instance->sndqueue, skb);
|
|
tasklet_schedule(&instance->tx_channel.tasklet);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
usbatm_pop(vcc, skb);
|
|
return err;
|
|
}
|
|
|
|
|
|
/********************
|
|
** bean counting **
|
|
********************/
|
|
|
|
static void usbatm_destroy_instance(struct kref *kref)
|
|
{
|
|
struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
|
|
|
|
dbg("%s", __func__);
|
|
|
|
tasklet_kill(&instance->rx_channel.tasklet);
|
|
tasklet_kill(&instance->tx_channel.tasklet);
|
|
usb_put_dev(instance->usb_dev);
|
|
kfree(instance);
|
|
}
|
|
|
|
void usbatm_get_instance(struct usbatm_data *instance)
|
|
{
|
|
dbg("%s", __func__);
|
|
|
|
kref_get(&instance->refcount);
|
|
}
|
|
|
|
void usbatm_put_instance(struct usbatm_data *instance)
|
|
{
|
|
dbg("%s", __func__);
|
|
|
|
kref_put(&instance->refcount, usbatm_destroy_instance);
|
|
}
|
|
|
|
|
|
/**********
|
|
** ATM **
|
|
**********/
|
|
|
|
static void usbatm_atm_dev_close(struct atm_dev *dev)
|
|
{
|
|
struct usbatm_data *instance = dev->dev_data;
|
|
|
|
dbg("%s", __func__);
|
|
|
|
if (!instance)
|
|
return;
|
|
|
|
dev->dev_data = NULL;
|
|
usbatm_put_instance(instance); /* taken in usbatm_atm_init */
|
|
}
|
|
|
|
static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
|
|
{
|
|
struct usbatm_data *instance = atm_dev->dev_data;
|
|
int left = *pos;
|
|
|
|
if (!instance) {
|
|
dbg("%s: NULL instance!", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!left--)
|
|
return sprintf(page, "%s\n", instance->description);
|
|
|
|
if (!left--)
|
|
return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
atm_dev->esi[0], atm_dev->esi[1],
|
|
atm_dev->esi[2], atm_dev->esi[3],
|
|
atm_dev->esi[4], atm_dev->esi[5]);
|
|
|
|
if (!left--)
|
|
return sprintf(page,
|
|
"AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
|
|
atomic_read(&atm_dev->stats.aal5.tx),
|
|
atomic_read(&atm_dev->stats.aal5.tx_err),
|
|
atomic_read(&atm_dev->stats.aal5.rx),
|
|
atomic_read(&atm_dev->stats.aal5.rx_err),
|
|
atomic_read(&atm_dev->stats.aal5.rx_drop));
|
|
|
|
if (!left--)
|
|
switch (atm_dev->signal) {
|
|
case ATM_PHY_SIG_FOUND:
|
|
return sprintf(page, "Line up\n");
|
|
case ATM_PHY_SIG_LOST:
|
|
return sprintf(page, "Line down\n");
|
|
default:
|
|
return sprintf(page, "Line state unknown\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usbatm_atm_open(struct atm_vcc *vcc)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_vcc_data *new = NULL;
|
|
int ret;
|
|
int vci = vcc->vci;
|
|
short vpi = vcc->vpi;
|
|
|
|
if (!instance) {
|
|
dbg("%s: NULL data!", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
|
|
|
|
/* only support AAL5 */
|
|
if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
|
|
|| (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
|
|
atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
|
|
return -EINVAL;
|
|
}
|
|
|
|
down(&instance->serialize); /* vs self, usbatm_atm_close */
|
|
|
|
if (usbatm_find_vcc(instance, vpi, vci)) {
|
|
atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
|
|
ret = -EADDRINUSE;
|
|
goto fail;
|
|
}
|
|
|
|
if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
|
|
atm_dbg(instance, "%s: no memory for vcc_data!\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
memset(new, 0, sizeof(struct usbatm_vcc_data));
|
|
new->vcc = vcc;
|
|
new->vpi = vpi;
|
|
new->vci = vci;
|
|
|
|
new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
|
|
if (!new->sarb) {
|
|
atm_dbg(instance, "%s: no memory for SAR buffer!\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
vcc->dev_data = new;
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
list_add(&new->list, &instance->vcc_list);
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
|
|
set_bit(ATM_VF_ADDR, &vcc->flags);
|
|
set_bit(ATM_VF_PARTIAL, &vcc->flags);
|
|
set_bit(ATM_VF_READY, &vcc->flags);
|
|
|
|
up(&instance->serialize);
|
|
|
|
atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
kfree(new);
|
|
up(&instance->serialize);
|
|
return ret;
|
|
}
|
|
|
|
static void usbatm_atm_close(struct atm_vcc *vcc)
|
|
{
|
|
struct usbatm_data *instance = vcc->dev->dev_data;
|
|
struct usbatm_vcc_data *vcc_data = vcc->dev_data;
|
|
|
|
if (!instance || !vcc_data) {
|
|
dbg("%s: NULL data!", __func__);
|
|
return;
|
|
}
|
|
|
|
atm_dbg(instance, "%s entered\n", __func__);
|
|
|
|
atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
|
|
__func__, vcc_data, vcc_data->vpi, vcc_data->vci);
|
|
|
|
usbatm_cancel_send(instance, vcc);
|
|
|
|
down(&instance->serialize); /* vs self, usbatm_atm_open */
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
list_del(&vcc_data->list);
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
|
|
kfree_skb(vcc_data->sarb);
|
|
vcc_data->sarb = NULL;
|
|
|
|
kfree(vcc_data);
|
|
vcc->dev_data = NULL;
|
|
|
|
vcc->vpi = ATM_VPI_UNSPEC;
|
|
vcc->vci = ATM_VCI_UNSPEC;
|
|
clear_bit(ATM_VF_READY, &vcc->flags);
|
|
clear_bit(ATM_VF_PARTIAL, &vcc->flags);
|
|
clear_bit(ATM_VF_ADDR, &vcc->flags);
|
|
|
|
up(&instance->serialize);
|
|
|
|
atm_dbg(instance, "%s successful\n", __func__);
|
|
}
|
|
|
|
static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
|
|
void __user * arg)
|
|
{
|
|
switch (cmd) {
|
|
case ATM_QUERYLOOP:
|
|
return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static int usbatm_atm_init(struct usbatm_data *instance)
|
|
{
|
|
struct atm_dev *atm_dev;
|
|
int ret, i;
|
|
|
|
/* ATM init */
|
|
atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
|
|
if (!atm_dev) {
|
|
usb_dbg(instance, "%s: failed to register ATM device!\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
instance->atm_dev = atm_dev;
|
|
|
|
atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
|
|
atm_dev->ci_range.vci_bits = ATM_CI_MAX;
|
|
atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
|
|
|
|
/* temp init ATM device, set to 128kbit */
|
|
atm_dev->link_rate = 128 * 1000 / 424;
|
|
|
|
if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
|
|
atm_dbg(instance, "%s: atm_start failed: %d!\n", __func__, ret);
|
|
goto fail;
|
|
}
|
|
|
|
/* ready for ATM callbacks */
|
|
usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
|
|
mb();
|
|
atm_dev->dev_data = instance;
|
|
|
|
/* submit all rx URBs */
|
|
for (i = 0; i < num_rcv_urbs; i++)
|
|
usbatm_submit_urb(instance->urbs[i]);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
instance->atm_dev = NULL;
|
|
shutdown_atm_dev(atm_dev); /* usbatm_atm_dev_close will eventually be called */
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**********
|
|
** USB **
|
|
**********/
|
|
|
|
static int usbatm_do_heavy_init(void *arg)
|
|
{
|
|
struct usbatm_data *instance = arg;
|
|
int ret;
|
|
|
|
daemonize(instance->driver->driver_name);
|
|
allow_signal(SIGTERM);
|
|
|
|
complete(&instance->thread_started);
|
|
|
|
ret = instance->driver->heavy_init(instance, instance->usb_intf);
|
|
|
|
if (!ret)
|
|
ret = usbatm_atm_init(instance);
|
|
|
|
down(&instance->serialize);
|
|
instance->thread_pid = -1;
|
|
up(&instance->serialize);
|
|
|
|
complete_and_exit(&instance->thread_exited, ret);
|
|
}
|
|
|
|
static int usbatm_heavy_init(struct usbatm_data *instance)
|
|
{
|
|
int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
|
|
|
|
if (ret < 0) {
|
|
usb_dbg(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
down(&instance->serialize);
|
|
instance->thread_pid = ret;
|
|
up(&instance->serialize);
|
|
|
|
wait_for_completion(&instance->thread_started);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void usbatm_tasklet_schedule(unsigned long data)
|
|
{
|
|
tasklet_schedule((struct tasklet_struct *) data);
|
|
}
|
|
|
|
static inline void usbatm_init_channel(struct usbatm_channel *channel)
|
|
{
|
|
spin_lock_init(&channel->lock);
|
|
INIT_LIST_HEAD(&channel->list);
|
|
channel->delay.function = usbatm_tasklet_schedule;
|
|
channel->delay.data = (unsigned long) &channel->tasklet;
|
|
init_timer(&channel->delay);
|
|
}
|
|
|
|
int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
|
|
struct usbatm_driver *driver)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
struct usb_device *usb_dev = interface_to_usbdev(intf);
|
|
struct usbatm_data *instance;
|
|
char *buf;
|
|
int error = -ENOMEM;
|
|
int i, length;
|
|
int need_heavy;
|
|
|
|
dev_dbg(dev, "%s: trying driver %s with vendor=0x%x, product=0x%x, ifnum %d\n",
|
|
__func__, driver->driver_name,
|
|
le16_to_cpu(usb_dev->descriptor.idVendor),
|
|
le16_to_cpu(usb_dev->descriptor.idProduct),
|
|
intf->altsetting->desc.bInterfaceNumber);
|
|
|
|
/* instance init */
|
|
instance = kcalloc(1, sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
|
|
if (!instance) {
|
|
dev_dbg(dev, "%s: no memory for instance data!\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* public fields */
|
|
|
|
instance->driver = driver;
|
|
snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
|
|
|
|
instance->usb_dev = usb_dev;
|
|
instance->usb_intf = intf;
|
|
|
|
buf = instance->description;
|
|
length = sizeof(instance->description);
|
|
|
|
if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
|
|
goto bind;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
i = scnprintf(buf, length, " (");
|
|
buf += i;
|
|
length -= i;
|
|
|
|
if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
|
|
goto bind;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
snprintf(buf, length, ")");
|
|
|
|
bind:
|
|
need_heavy = 1;
|
|
if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) {
|
|
dev_dbg(dev, "%s: bind failed: %d!\n", __func__, error);
|
|
goto fail_free;
|
|
}
|
|
|
|
/* private fields */
|
|
|
|
kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
|
|
init_MUTEX(&instance->serialize);
|
|
|
|
instance->thread_pid = -1;
|
|
init_completion(&instance->thread_started);
|
|
init_completion(&instance->thread_exited);
|
|
|
|
INIT_LIST_HEAD(&instance->vcc_list);
|
|
|
|
usbatm_init_channel(&instance->rx_channel);
|
|
usbatm_init_channel(&instance->tx_channel);
|
|
tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
|
|
tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
|
|
instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in);
|
|
instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out);
|
|
instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
|
|
instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
|
|
instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride;
|
|
instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride;
|
|
instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
|
|
|
|
skb_queue_head_init(&instance->sndqueue);
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
struct urb *urb;
|
|
u8 *buffer;
|
|
unsigned int iso_packets = 0, iso_size = 0;
|
|
struct usbatm_channel *channel = i < num_rcv_urbs ?
|
|
&instance->rx_channel : &instance->tx_channel;
|
|
|
|
if (usb_pipeisoc(channel->endpoint)) {
|
|
/* don't expect iso out endpoints */
|
|
iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0);
|
|
iso_size -= iso_size % channel->stride; /* alignment */
|
|
BUG_ON(!iso_size);
|
|
iso_packets = (channel->buf_size - 1) / iso_size + 1;
|
|
}
|
|
|
|
urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
|
|
if (!urb) {
|
|
dev_dbg(dev, "%s: no memory for urb %d!\n", __func__, i);
|
|
goto fail_unbind;
|
|
}
|
|
|
|
instance->urbs[i] = urb;
|
|
|
|
buffer = kmalloc(channel->buf_size, GFP_KERNEL);
|
|
if (!buffer) {
|
|
dev_dbg(dev, "%s: no memory for buffer %d!\n", __func__, i);
|
|
goto fail_unbind;
|
|
}
|
|
memset(buffer, 0, channel->buf_size);
|
|
|
|
usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
|
|
buffer, channel->buf_size, usbatm_complete, channel);
|
|
if (iso_packets) {
|
|
int j;
|
|
urb->interval = 1;
|
|
urb->transfer_flags = URB_ISO_ASAP;
|
|
urb->number_of_packets = iso_packets;
|
|
for (j = 0; j < iso_packets; j++) {
|
|
urb->iso_frame_desc[j].offset = iso_size * j;
|
|
urb->iso_frame_desc[j].length = min_t(int, iso_size,
|
|
channel->buf_size - urb->iso_frame_desc[j].offset);
|
|
}
|
|
}
|
|
|
|
/* put all tx URBs on the list of spares */
|
|
if (i >= num_rcv_urbs)
|
|
list_add_tail(&urb->urb_list, &channel->list);
|
|
|
|
vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
|
|
__func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
|
|
}
|
|
|
|
if (need_heavy && driver->heavy_init) {
|
|
error = usbatm_heavy_init(instance);
|
|
} else {
|
|
complete(&instance->thread_exited); /* pretend that heavy_init was run */
|
|
error = usbatm_atm_init(instance);
|
|
}
|
|
|
|
if (error < 0)
|
|
goto fail_unbind;
|
|
|
|
usb_get_dev(usb_dev);
|
|
usb_set_intfdata(intf, instance);
|
|
|
|
return 0;
|
|
|
|
fail_unbind:
|
|
if (instance->driver->unbind)
|
|
instance->driver->unbind(instance, intf);
|
|
fail_free:
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
if (instance->urbs[i])
|
|
kfree(instance->urbs[i]->transfer_buffer);
|
|
usb_free_urb(instance->urbs[i]);
|
|
}
|
|
|
|
kfree (instance);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbatm_usb_probe);
|
|
|
|
void usbatm_usb_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
struct usbatm_data *instance = usb_get_intfdata(intf);
|
|
int i;
|
|
|
|
dev_dbg(dev, "%s entered\n", __func__);
|
|
|
|
if (!instance) {
|
|
dev_dbg(dev, "%s: NULL instance!\n", __func__);
|
|
return;
|
|
}
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
down(&instance->serialize);
|
|
if (instance->thread_pid >= 0)
|
|
kill_proc(instance->thread_pid, SIGTERM, 1);
|
|
up(&instance->serialize);
|
|
|
|
wait_for_completion(&instance->thread_exited);
|
|
|
|
tasklet_disable(&instance->rx_channel.tasklet);
|
|
tasklet_disable(&instance->tx_channel.tasklet);
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
|
|
usb_kill_urb(instance->urbs[i]);
|
|
|
|
del_timer_sync(&instance->rx_channel.delay);
|
|
del_timer_sync(&instance->tx_channel.delay);
|
|
|
|
if (instance->atm_dev && instance->driver->atm_stop)
|
|
instance->driver->atm_stop(instance, instance->atm_dev);
|
|
|
|
if (instance->driver->unbind)
|
|
instance->driver->unbind(instance, intf);
|
|
|
|
instance->driver_data = NULL;
|
|
|
|
/* turn usbatm_[rt]x_process into noop */
|
|
/* no need to take the spinlock */
|
|
INIT_LIST_HEAD(&instance->rx_channel.list);
|
|
INIT_LIST_HEAD(&instance->tx_channel.list);
|
|
|
|
tasklet_enable(&instance->rx_channel.tasklet);
|
|
tasklet_enable(&instance->tx_channel.tasklet);
|
|
|
|
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
|
|
kfree(instance->urbs[i]->transfer_buffer);
|
|
usb_free_urb(instance->urbs[i]);
|
|
}
|
|
|
|
/* ATM finalize */
|
|
if (instance->atm_dev)
|
|
shutdown_atm_dev(instance->atm_dev);
|
|
|
|
usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
|
|
}
|
|
EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
|
|
|
|
|
|
/***********
|
|
** init **
|
|
***********/
|
|
|
|
static int __init usbatm_usb_init(void)
|
|
{
|
|
dbg("%s: driver version %s", __func__, DRIVER_VERSION);
|
|
|
|
if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
|
|
printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
|
|
return -EIO;
|
|
}
|
|
|
|
if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
|
|
|| (num_snd_urbs > UDSL_MAX_SND_URBS)
|
|
|| (rcv_buf_size < 1)
|
|
|| (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
|
|
|| (snd_buf_size < 1)
|
|
|| (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
module_init(usbatm_usb_init);
|
|
|
|
static void __exit usbatm_usb_exit(void)
|
|
{
|
|
dbg("%s", __func__);
|
|
}
|
|
module_exit(usbatm_usb_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
|
|
/************
|
|
** debug **
|
|
************/
|
|
|
|
#ifdef VERBOSE_DEBUG
|
|
static int usbatm_print_packet(const unsigned char *data, int len)
|
|
{
|
|
unsigned char buffer[256];
|
|
int i = 0, j = 0;
|
|
|
|
for (i = 0; i < len;) {
|
|
buffer[0] = '\0';
|
|
sprintf(buffer, "%.3d :", i);
|
|
for (j = 0; (j < 16) && (i < len); j++, i++) {
|
|
sprintf(buffer, "%s %2.2x", buffer, data[i]);
|
|
}
|
|
dbg("%s", buffer);
|
|
}
|
|
return i;
|
|
}
|
|
#endif
|