1189 lines
32 KiB
C
1189 lines
32 KiB
C
/******************************************************************************
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* usb_atm.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
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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, maintained by Duncan Sands (duncan.sands@free.fr)
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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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* udsl_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 udsl_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 udsl_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 <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <asm/uaccess.h>
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#include <linux/smp_lock.h>
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#include <linux/interrupt.h>
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#include <linux/atm.h>
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#include <linux/atmdev.h>
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#include <linux/crc32.h>
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#include <linux/init.h>
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#include <linux/firmware.h>
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#include "usb_atm.h"
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#ifdef VERBOSE_DEBUG
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static int udsl_print_packet(const unsigned char *data, int len);
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#define PACKETDEBUG(arg...) udsl_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 "1.8"
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#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
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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 num_rcv_bufs = UDSL_DEFAULT_RCV_BUFS;
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static unsigned int num_snd_bufs = UDSL_DEFAULT_SND_BUFS;
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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, 0444);
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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, 0444);
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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(num_rcv_bufs, uint, 0444);
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MODULE_PARM_DESC(num_rcv_bufs,
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"Number of buffers used for reception (range: 0-"
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__MODULE_STRING(UDSL_MAX_RCV_BUFS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_RCV_BUFS) ")");
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module_param(num_snd_bufs, uint, 0444);
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MODULE_PARM_DESC(num_snd_bufs,
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"Number of buffers used for transmission (range: 0-"
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__MODULE_STRING(UDSL_MAX_SND_BUFS) ", default: "
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__MODULE_STRING(UDSL_DEFAULT_SND_BUFS) ")");
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module_param(rcv_buf_size, uint, 0444);
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MODULE_PARM_DESC(rcv_buf_size,
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"Size of the buffers used for reception (range: 0-"
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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, 0444);
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MODULE_PARM_DESC(snd_buf_size,
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"Size of the buffers used for transmission (range: 0-"
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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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/* ATM */
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static void udsl_atm_dev_close(struct atm_dev *dev);
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static int udsl_atm_open(struct atm_vcc *vcc);
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static void udsl_atm_close(struct atm_vcc *vcc);
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static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
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static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
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static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
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static struct atmdev_ops udsl_atm_devops = {
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.dev_close = udsl_atm_dev_close,
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.open = udsl_atm_open,
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.close = udsl_atm_close,
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.ioctl = udsl_atm_ioctl,
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.send = udsl_atm_send,
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.proc_read = udsl_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 void udsl_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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** decode **
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*************/
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static inline struct udsl_vcc_data *udsl_find_vcc(struct udsl_instance_data *instance,
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short vpi, int vci)
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{
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struct udsl_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 udsl_extract_cells(struct udsl_instance_data *instance,
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unsigned char *source, unsigned int howmany)
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{
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struct udsl_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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struct udsl_vcc_data *vcc_data;
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int cached_vci = 0;
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unsigned int i;
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int pti;
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int vci;
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short cached_vpi = 0;
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short vpi;
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for (i = 0; i < howmany;
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i++, source += ATM_CELL_SIZE + instance->rcv_padding) {
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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] & 0x2) != 0;
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vdbg("udsl_extract_cells: vpi %hd, vci %d, pti %d", vpi, vci, pti);
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if (cached_vcc && (vci == cached_vci) && (vpi == cached_vpi))
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vcc_data = cached_vcc;
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else if ((vcc_data = udsl_find_vcc(instance, vpi, vci))) {
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cached_vcc = vcc_data;
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cached_vpi = vpi;
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cached_vci = vci;
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} else {
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dbg("udsl_extract_cells: unknown vpi/vci (%hd/%d)!", vpi, vci);
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continue;
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}
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vcc = vcc_data->vcc;
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sarb = vcc_data->sarb;
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if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
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dbg("udsl_extract_cells: buffer overrun (sarb->len %u, vcc: 0x%p)!", sarb->len, vcc);
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/* discard cells already received */
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skb_trim(sarb, 0);
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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) {
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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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dbg("udsl_extract_cells: bogus length %u (vcc: 0x%p)!", 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 = UDSL_NUM_CELLS(length) * ATM_CELL_PAYLOAD;
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if (sarb->len < pdu_length) {
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dbg("udsl_extract_cells: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!", 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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dbg("udsl_extract_cells: packet failed crc check (vcc: 0x%p)!", 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("udsl_extract_cells: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", length, pdu_length, vcc);
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if (!(skb = dev_alloc_skb(length))) {
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dbg("udsl_extract_cells: no memory for skb (length: %u)!", length);
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atomic_inc(&vcc->stats->rx_drop);
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goto out;
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}
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vdbg("udsl_extract_cells: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", skb, skb->truesize);
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if (!atm_charge(vcc, skb->truesize)) {
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dbg("udsl_extract_cells: failed atm_charge (skb->truesize: %u)!", 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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vdbg("udsl_extract_cells: sending skb 0x%p, skb->len %u, skb->truesize %u", skb, skb->len, skb->truesize);
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PACKETDEBUG(skb->data, skb->len);
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vcc->push(vcc, skb);
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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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static inline void udsl_fill_cell_header(unsigned char *target, struct atm_vcc *vcc)
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{
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target[0] = vcc->vpi >> 4;
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target[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
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target[2] = vcc->vci >> 4;
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target[3] = vcc->vci << 4;
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target[4] = 0xec;
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}
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static const unsigned char zeros[ATM_CELL_PAYLOAD];
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static void udsl_groom_skb(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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struct udsl_control *ctrl = UDSL_SKB(skb);
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unsigned int zero_padding;
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u32 crc;
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ctrl->atm_data.vcc = vcc;
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ctrl->num_cells = UDSL_NUM_CELLS(skb->len);
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ctrl->num_entire = skb->len / ATM_CELL_PAYLOAD;
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zero_padding = ctrl->num_cells * ATM_CELL_PAYLOAD - skb->len - ATM_AAL5_TRAILER;
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if (ctrl->num_entire + 1 < ctrl->num_cells)
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ctrl->pdu_padding = zero_padding - (ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
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else
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ctrl->pdu_padding = zero_padding;
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ctrl->aal5_trailer[0] = 0; /* UU = 0 */
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ctrl->aal5_trailer[1] = 0; /* CPI = 0 */
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ctrl->aal5_trailer[2] = skb->len >> 8;
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ctrl->aal5_trailer[3] = skb->len;
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crc = crc32_be(~0, skb->data, skb->len);
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crc = crc32_be(crc, zeros, zero_padding);
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crc = crc32_be(crc, ctrl->aal5_trailer, 4);
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crc = ~crc;
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ctrl->aal5_trailer[4] = crc >> 24;
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ctrl->aal5_trailer[5] = crc >> 16;
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ctrl->aal5_trailer[6] = crc >> 8;
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ctrl->aal5_trailer[7] = crc;
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}
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static unsigned int udsl_write_cells(struct udsl_instance_data *instance,
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unsigned int howmany, struct sk_buff *skb,
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unsigned char **target_p)
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{
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struct udsl_control *ctrl = UDSL_SKB(skb);
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unsigned char *target = *target_p;
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unsigned int nc, ne, i;
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vdbg("udsl_write_cells: howmany=%u, skb->len=%d, num_cells=%u, num_entire=%u, pdu_padding=%u", howmany, skb->len, ctrl->num_cells, ctrl->num_entire, ctrl->pdu_padding);
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nc = ctrl->num_cells;
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ne = min(howmany, ctrl->num_entire);
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for (i = 0; i < ne; i++) {
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udsl_fill_cell_header(target, ctrl->atm_data.vcc);
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target += ATM_CELL_HEADER;
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memcpy(target, skb->data, ATM_CELL_PAYLOAD);
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target += ATM_CELL_PAYLOAD;
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if (instance->snd_padding) {
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memset(target, 0, instance->snd_padding);
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target += instance->snd_padding;
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}
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__skb_pull(skb, ATM_CELL_PAYLOAD);
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}
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ctrl->num_entire -= ne;
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if (!(ctrl->num_cells -= ne) || !(howmany -= ne))
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goto out;
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udsl_fill_cell_header(target, ctrl->atm_data.vcc);
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target += ATM_CELL_HEADER;
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memcpy(target, skb->data, skb->len);
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target += skb->len;
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__skb_pull(skb, skb->len);
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memset(target, 0, ctrl->pdu_padding);
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target += ctrl->pdu_padding;
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|
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if (--ctrl->num_cells) {
|
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if (!--howmany) {
|
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ctrl->pdu_padding = ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
|
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goto out;
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}
|
|
|
|
if (instance->snd_padding) {
|
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memset(target, 0, instance->snd_padding);
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target += instance->snd_padding;
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}
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udsl_fill_cell_header(target, ctrl->atm_data.vcc);
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target += ATM_CELL_HEADER;
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memset(target, 0, ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
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target += ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
|
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|
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--ctrl->num_cells;
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UDSL_ASSERT(!ctrl->num_cells);
|
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}
|
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|
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memcpy(target, ctrl->aal5_trailer, ATM_AAL5_TRAILER);
|
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target += ATM_AAL5_TRAILER;
|
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/* set pti bit in last cell */
|
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*(target + 3 - ATM_CELL_SIZE) |= 0x2;
|
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if (instance->snd_padding) {
|
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memset(target, 0, instance->snd_padding);
|
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target += instance->snd_padding;
|
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}
|
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out:
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*target_p = target;
|
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return nc - ctrl->num_cells;
|
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}
|
|
|
|
/**************
|
|
** receive **
|
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**************/
|
|
|
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static void udsl_complete_receive(struct urb *urb, struct pt_regs *regs)
|
|
{
|
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struct udsl_receive_buffer *buf;
|
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struct udsl_instance_data *instance;
|
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struct udsl_receiver *rcv;
|
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unsigned long flags;
|
|
|
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if (!urb || !(rcv = urb->context)) {
|
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dbg("udsl_complete_receive: bad urb!");
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return;
|
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}
|
|
|
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instance = rcv->instance;
|
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buf = rcv->buffer;
|
|
|
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buf->filled_cells = urb->actual_length / (ATM_CELL_SIZE + instance->rcv_padding);
|
|
|
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vdbg("udsl_complete_receive: urb 0x%p, status %d, actual_length %d, filled_cells %u, rcv 0x%p, buf 0x%p", urb, urb->status, urb->actual_length, buf->filled_cells, rcv, buf);
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|
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UDSL_ASSERT(buf->filled_cells <= rcv_buf_size);
|
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|
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/* may not be in_interrupt() */
|
|
spin_lock_irqsave(&instance->receive_lock, flags);
|
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list_add(&rcv->list, &instance->spare_receivers);
|
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list_add_tail(&buf->list, &instance->filled_receive_buffers);
|
|
if (likely(!urb->status))
|
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tasklet_schedule(&instance->receive_tasklet);
|
|
spin_unlock_irqrestore(&instance->receive_lock, flags);
|
|
}
|
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|
|
static void udsl_process_receive(unsigned long data)
|
|
{
|
|
struct udsl_receive_buffer *buf;
|
|
struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
|
|
struct udsl_receiver *rcv;
|
|
int err;
|
|
|
|
made_progress:
|
|
while (!list_empty(&instance->spare_receive_buffers)) {
|
|
spin_lock_irq(&instance->receive_lock);
|
|
if (list_empty(&instance->spare_receivers)) {
|
|
spin_unlock_irq(&instance->receive_lock);
|
|
break;
|
|
}
|
|
rcv = list_entry(instance->spare_receivers.next,
|
|
struct udsl_receiver, list);
|
|
list_del(&rcv->list);
|
|
spin_unlock_irq(&instance->receive_lock);
|
|
|
|
buf = list_entry(instance->spare_receive_buffers.next,
|
|
struct udsl_receive_buffer, list);
|
|
list_del(&buf->list);
|
|
|
|
rcv->buffer = buf;
|
|
|
|
usb_fill_bulk_urb(rcv->urb, instance->usb_dev,
|
|
usb_rcvbulkpipe(instance->usb_dev, instance->data_endpoint),
|
|
buf->base,
|
|
rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
|
|
udsl_complete_receive, rcv);
|
|
|
|
vdbg("udsl_process_receive: sending urb 0x%p, rcv 0x%p, buf 0x%p",
|
|
rcv->urb, rcv, buf);
|
|
|
|
if ((err = usb_submit_urb(rcv->urb, GFP_ATOMIC)) < 0) {
|
|
dbg("udsl_process_receive: urb submission failed (%d)!", err);
|
|
list_add(&buf->list, &instance->spare_receive_buffers);
|
|
spin_lock_irq(&instance->receive_lock);
|
|
list_add(&rcv->list, &instance->spare_receivers);
|
|
spin_unlock_irq(&instance->receive_lock);
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_lock_irq(&instance->receive_lock);
|
|
if (list_empty(&instance->filled_receive_buffers)) {
|
|
spin_unlock_irq(&instance->receive_lock);
|
|
return; /* done - no more buffers */
|
|
}
|
|
buf = list_entry(instance->filled_receive_buffers.next,
|
|
struct udsl_receive_buffer, list);
|
|
list_del(&buf->list);
|
|
spin_unlock_irq(&instance->receive_lock);
|
|
|
|
vdbg("udsl_process_receive: processing buf 0x%p", buf);
|
|
udsl_extract_cells(instance, buf->base, buf->filled_cells);
|
|
list_add(&buf->list, &instance->spare_receive_buffers);
|
|
goto made_progress;
|
|
}
|
|
|
|
/***********
|
|
** send **
|
|
***********/
|
|
|
|
static void udsl_complete_send(struct urb *urb, struct pt_regs *regs)
|
|
{
|
|
struct udsl_instance_data *instance;
|
|
struct udsl_sender *snd;
|
|
unsigned long flags;
|
|
|
|
if (!urb || !(snd = urb->context) || !(instance = snd->instance)) {
|
|
dbg("udsl_complete_send: bad urb!");
|
|
return;
|
|
}
|
|
|
|
vdbg("udsl_complete_send: urb 0x%p, status %d, snd 0x%p, buf 0x%p", urb,
|
|
urb->status, snd, snd->buffer);
|
|
|
|
/* may not be in_interrupt() */
|
|
spin_lock_irqsave(&instance->send_lock, flags);
|
|
list_add(&snd->list, &instance->spare_senders);
|
|
list_add(&snd->buffer->list, &instance->spare_send_buffers);
|
|
tasklet_schedule(&instance->send_tasklet);
|
|
spin_unlock_irqrestore(&instance->send_lock, flags);
|
|
}
|
|
|
|
static void udsl_process_send(unsigned long data)
|
|
{
|
|
struct udsl_send_buffer *buf;
|
|
struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
|
|
struct sk_buff *skb;
|
|
struct udsl_sender *snd;
|
|
int err;
|
|
unsigned int num_written;
|
|
|
|
made_progress:
|
|
spin_lock_irq(&instance->send_lock);
|
|
while (!list_empty(&instance->spare_senders)) {
|
|
if (!list_empty(&instance->filled_send_buffers)) {
|
|
buf = list_entry(instance->filled_send_buffers.next,
|
|
struct udsl_send_buffer, list);
|
|
list_del(&buf->list);
|
|
} else if ((buf = instance->current_buffer)) {
|
|
instance->current_buffer = NULL;
|
|
} else /* all buffers empty */
|
|
break;
|
|
|
|
snd = list_entry(instance->spare_senders.next,
|
|
struct udsl_sender, list);
|
|
list_del(&snd->list);
|
|
spin_unlock_irq(&instance->send_lock);
|
|
|
|
snd->buffer = buf;
|
|
usb_fill_bulk_urb(snd->urb, instance->usb_dev,
|
|
usb_sndbulkpipe(instance->usb_dev, instance->data_endpoint),
|
|
buf->base,
|
|
(snd_buf_size - buf->free_cells) * (ATM_CELL_SIZE + instance->snd_padding),
|
|
udsl_complete_send, snd);
|
|
|
|
vdbg("udsl_process_send: submitting urb 0x%p (%d cells), snd 0x%p, buf 0x%p",
|
|
snd->urb, snd_buf_size - buf->free_cells, snd, buf);
|
|
|
|
if ((err = usb_submit_urb(snd->urb, GFP_ATOMIC)) < 0) {
|
|
dbg("udsl_process_send: urb submission failed (%d)!", err);
|
|
spin_lock_irq(&instance->send_lock);
|
|
list_add(&snd->list, &instance->spare_senders);
|
|
spin_unlock_irq(&instance->send_lock);
|
|
list_add(&buf->list, &instance->filled_send_buffers);
|
|
return; /* bail out */
|
|
}
|
|
|
|
spin_lock_irq(&instance->send_lock);
|
|
} /* while */
|
|
spin_unlock_irq(&instance->send_lock);
|
|
|
|
if (!instance->current_skb)
|
|
instance->current_skb = skb_dequeue(&instance->sndqueue);
|
|
if (!instance->current_skb)
|
|
return; /* done - no more skbs */
|
|
|
|
skb = instance->current_skb;
|
|
|
|
if (!(buf = instance->current_buffer)) {
|
|
spin_lock_irq(&instance->send_lock);
|
|
if (list_empty(&instance->spare_send_buffers)) {
|
|
instance->current_buffer = NULL;
|
|
spin_unlock_irq(&instance->send_lock);
|
|
return; /* done - no more buffers */
|
|
}
|
|
buf = list_entry(instance->spare_send_buffers.next,
|
|
struct udsl_send_buffer, list);
|
|
list_del(&buf->list);
|
|
spin_unlock_irq(&instance->send_lock);
|
|
|
|
buf->free_start = buf->base;
|
|
buf->free_cells = snd_buf_size;
|
|
|
|
instance->current_buffer = buf;
|
|
}
|
|
|
|
num_written = udsl_write_cells(instance, buf->free_cells, skb, &buf->free_start);
|
|
|
|
vdbg("udsl_process_send: wrote %u cells from skb 0x%p to buffer 0x%p",
|
|
num_written, skb, buf);
|
|
|
|
if (!(buf->free_cells -= num_written)) {
|
|
list_add_tail(&buf->list, &instance->filled_send_buffers);
|
|
instance->current_buffer = NULL;
|
|
}
|
|
|
|
vdbg("udsl_process_send: buffer contains %d cells, %d left",
|
|
snd_buf_size - buf->free_cells, buf->free_cells);
|
|
|
|
if (!UDSL_SKB(skb)->num_cells) {
|
|
struct atm_vcc *vcc = UDSL_SKB(skb)->atm_data.vcc;
|
|
|
|
udsl_pop(vcc, skb);
|
|
instance->current_skb = NULL;
|
|
|
|
atomic_inc(&vcc->stats->tx);
|
|
}
|
|
|
|
goto made_progress;
|
|
}
|
|
|
|
static void udsl_cancel_send(struct udsl_instance_data *instance,
|
|
struct atm_vcc *vcc)
|
|
{
|
|
struct sk_buff *skb, *n;
|
|
|
|
dbg("udsl_cancel_send entered");
|
|
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_data.vcc == vcc) {
|
|
dbg("udsl_cancel_send: popping skb 0x%p", skb);
|
|
__skb_unlink(skb, &instance->sndqueue);
|
|
udsl_pop(vcc, skb);
|
|
}
|
|
spin_unlock_irq(&instance->sndqueue.lock);
|
|
|
|
tasklet_disable(&instance->send_tasklet);
|
|
if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm_data.vcc == vcc)) {
|
|
dbg("udsl_cancel_send: popping current skb (0x%p)", skb);
|
|
instance->current_skb = NULL;
|
|
udsl_pop(vcc, skb);
|
|
}
|
|
tasklet_enable(&instance->send_tasklet);
|
|
dbg("udsl_cancel_send done");
|
|
}
|
|
|
|
static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
|
|
{
|
|
struct udsl_instance_data *instance = vcc->dev->dev_data;
|
|
int err;
|
|
|
|
vdbg("udsl_atm_send called (skb 0x%p, len %u)", skb, skb->len);
|
|
|
|
if (!instance) {
|
|
dbg("udsl_atm_send: NULL data!");
|
|
err = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
if (vcc->qos.aal != ATM_AAL5) {
|
|
dbg("udsl_atm_send: unsupported ATM type %d!", vcc->qos.aal);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (skb->len > ATM_MAX_AAL5_PDU) {
|
|
dbg("udsl_atm_send: packet too long (%d vs %d)!", skb->len,
|
|
ATM_MAX_AAL5_PDU);
|
|
err = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
PACKETDEBUG(skb->data, skb->len);
|
|
|
|
udsl_groom_skb(vcc, skb);
|
|
skb_queue_tail(&instance->sndqueue, skb);
|
|
tasklet_schedule(&instance->send_tasklet);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
udsl_pop(vcc, skb);
|
|
return err;
|
|
}
|
|
|
|
/********************
|
|
** bean counting **
|
|
********************/
|
|
|
|
static void udsl_destroy_instance(struct kref *kref)
|
|
{
|
|
struct udsl_instance_data *instance =
|
|
container_of(kref, struct udsl_instance_data, refcount);
|
|
|
|
tasklet_kill(&instance->receive_tasklet);
|
|
tasklet_kill(&instance->send_tasklet);
|
|
usb_put_dev(instance->usb_dev);
|
|
kfree(instance);
|
|
}
|
|
|
|
void udsl_get_instance(struct udsl_instance_data *instance)
|
|
{
|
|
kref_get(&instance->refcount);
|
|
}
|
|
|
|
void udsl_put_instance(struct udsl_instance_data *instance)
|
|
{
|
|
kref_put(&instance->refcount, udsl_destroy_instance);
|
|
}
|
|
|
|
/**********
|
|
** ATM **
|
|
**********/
|
|
|
|
static void udsl_atm_dev_close(struct atm_dev *dev)
|
|
{
|
|
struct udsl_instance_data *instance = dev->dev_data;
|
|
|
|
dev->dev_data = NULL;
|
|
udsl_put_instance(instance);
|
|
}
|
|
|
|
static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
|
|
{
|
|
struct udsl_instance_data *instance = atm_dev->dev_data;
|
|
int left = *pos;
|
|
|
|
if (!instance) {
|
|
dbg("udsl_atm_proc_read: NULL instance!");
|
|
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:
|
|
sprintf(page, "Line up");
|
|
break;
|
|
case ATM_PHY_SIG_LOST:
|
|
sprintf(page, "Line down");
|
|
break;
|
|
default:
|
|
sprintf(page, "Line state unknown");
|
|
break;
|
|
}
|
|
|
|
if (instance->usb_dev->state == USB_STATE_NOTATTACHED)
|
|
strcat(page, ", disconnected\n");
|
|
else {
|
|
if (instance->status == UDSL_LOADED_FIRMWARE)
|
|
strcat(page, ", firmware loaded\n");
|
|
else if (instance->status == UDSL_LOADING_FIRMWARE)
|
|
strcat(page, ", firmware loading\n");
|
|
else
|
|
strcat(page, ", no firmware\n");
|
|
}
|
|
|
|
return strlen(page);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int udsl_atm_open(struct atm_vcc *vcc)
|
|
{
|
|
struct udsl_instance_data *instance = vcc->dev->dev_data;
|
|
struct udsl_vcc_data *new;
|
|
unsigned int max_pdu;
|
|
int vci = vcc->vci;
|
|
short vpi = vcc->vpi;
|
|
int err;
|
|
|
|
dbg("udsl_atm_open: vpi %hd, vci %d", vpi, vci);
|
|
|
|
if (!instance) {
|
|
dbg("udsl_atm_open: NULL data!");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* only support AAL5 */
|
|
if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
|
|
|| (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
|
|
dbg("udsl_atm_open: unsupported ATM type %d!", vcc->qos.aal);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (instance->firmware_wait &&
|
|
(err = instance->firmware_wait(instance)) < 0) {
|
|
dbg("udsl_atm_open: firmware not loaded (%d)!", err);
|
|
return err;
|
|
}
|
|
|
|
down(&instance->serialize); /* vs self, udsl_atm_close */
|
|
|
|
if (udsl_find_vcc(instance, vpi, vci)) {
|
|
dbg("udsl_atm_open: %hd/%d already in use!", vpi, vci);
|
|
up(&instance->serialize);
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
if (!(new = kmalloc(sizeof(struct udsl_vcc_data), GFP_KERNEL))) {
|
|
dbg("udsl_atm_open: no memory for vcc_data!");
|
|
up(&instance->serialize);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memset(new, 0, sizeof(struct udsl_vcc_data));
|
|
new->vcc = vcc;
|
|
new->vpi = vpi;
|
|
new->vci = vci;
|
|
|
|
/* udsl_extract_cells requires at least one cell */
|
|
max_pdu = max(1, UDSL_NUM_CELLS(vcc->qos.rxtp.max_sdu)) * ATM_CELL_PAYLOAD;
|
|
if (!(new->sarb = alloc_skb(max_pdu, GFP_KERNEL))) {
|
|
dbg("udsl_atm_open: no memory for SAR buffer!");
|
|
kfree(new);
|
|
up(&instance->serialize);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vcc->dev_data = new;
|
|
|
|
tasklet_disable(&instance->receive_tasklet);
|
|
list_add(&new->list, &instance->vcc_list);
|
|
tasklet_enable(&instance->receive_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);
|
|
|
|
tasklet_schedule(&instance->receive_tasklet);
|
|
|
|
dbg("udsl_atm_open: allocated vcc data 0x%p (max_pdu: %u)", new, max_pdu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void udsl_atm_close(struct atm_vcc *vcc)
|
|
{
|
|
struct udsl_instance_data *instance = vcc->dev->dev_data;
|
|
struct udsl_vcc_data *vcc_data = vcc->dev_data;
|
|
|
|
dbg("udsl_atm_close called");
|
|
|
|
if (!instance || !vcc_data) {
|
|
dbg("udsl_atm_close: NULL data!");
|
|
return;
|
|
}
|
|
|
|
dbg("udsl_atm_close: deallocating vcc 0x%p with vpi %d vci %d",
|
|
vcc_data, vcc_data->vpi, vcc_data->vci);
|
|
|
|
udsl_cancel_send(instance, vcc);
|
|
|
|
down(&instance->serialize); /* vs self, udsl_atm_open */
|
|
|
|
tasklet_disable(&instance->receive_tasklet);
|
|
list_del(&vcc_data->list);
|
|
tasklet_enable(&instance->receive_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);
|
|
|
|
dbg("udsl_atm_close successful");
|
|
}
|
|
|
|
static int udsl_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;
|
|
}
|
|
}
|
|
|
|
/**********
|
|
** USB **
|
|
**********/
|
|
|
|
int udsl_instance_setup(struct usb_device *dev,
|
|
struct udsl_instance_data *instance)
|
|
{
|
|
char *buf;
|
|
int i, length;
|
|
|
|
kref_init(&instance->refcount); /* one for USB */
|
|
udsl_get_instance(instance); /* one for ATM */
|
|
|
|
init_MUTEX(&instance->serialize);
|
|
|
|
instance->usb_dev = dev;
|
|
|
|
INIT_LIST_HEAD(&instance->vcc_list);
|
|
|
|
instance->status = UDSL_NO_FIRMWARE;
|
|
init_waitqueue_head(&instance->firmware_waiters);
|
|
|
|
spin_lock_init(&instance->receive_lock);
|
|
INIT_LIST_HEAD(&instance->spare_receivers);
|
|
INIT_LIST_HEAD(&instance->filled_receive_buffers);
|
|
|
|
tasklet_init(&instance->receive_tasklet, udsl_process_receive, (unsigned long)instance);
|
|
INIT_LIST_HEAD(&instance->spare_receive_buffers);
|
|
|
|
skb_queue_head_init(&instance->sndqueue);
|
|
|
|
spin_lock_init(&instance->send_lock);
|
|
INIT_LIST_HEAD(&instance->spare_senders);
|
|
INIT_LIST_HEAD(&instance->spare_send_buffers);
|
|
|
|
tasklet_init(&instance->send_tasklet, udsl_process_send,
|
|
(unsigned long)instance);
|
|
INIT_LIST_HEAD(&instance->filled_send_buffers);
|
|
|
|
/* receive init */
|
|
for (i = 0; i < num_rcv_urbs; i++) {
|
|
struct udsl_receiver *rcv = &(instance->receivers[i]);
|
|
|
|
if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
|
|
dbg("udsl_usb_probe: no memory for receive urb %d!", i);
|
|
goto fail;
|
|
}
|
|
|
|
rcv->instance = instance;
|
|
|
|
list_add(&rcv->list, &instance->spare_receivers);
|
|
}
|
|
|
|
for (i = 0; i < num_rcv_bufs; i++) {
|
|
struct udsl_receive_buffer *buf =
|
|
&(instance->receive_buffers[i]);
|
|
|
|
buf->base = kmalloc(rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
|
|
GFP_KERNEL);
|
|
if (!buf->base) {
|
|
dbg("udsl_usb_probe: no memory for receive buffer %d!", i);
|
|
goto fail;
|
|
}
|
|
|
|
list_add(&buf->list, &instance->spare_receive_buffers);
|
|
}
|
|
|
|
/* send init */
|
|
for (i = 0; i < num_snd_urbs; i++) {
|
|
struct udsl_sender *snd = &(instance->senders[i]);
|
|
|
|
if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
|
|
dbg("udsl_usb_probe: no memory for send urb %d!", i);
|
|
goto fail;
|
|
}
|
|
|
|
snd->instance = instance;
|
|
|
|
list_add(&snd->list, &instance->spare_senders);
|
|
}
|
|
|
|
for (i = 0; i < num_snd_bufs; i++) {
|
|
struct udsl_send_buffer *buf = &(instance->send_buffers[i]);
|
|
|
|
buf->base = kmalloc(snd_buf_size * (ATM_CELL_SIZE + instance->snd_padding),
|
|
GFP_KERNEL);
|
|
if (!buf->base) {
|
|
dbg("udsl_usb_probe: no memory for send buffer %d!", i);
|
|
goto fail;
|
|
}
|
|
|
|
list_add(&buf->list, &instance->spare_send_buffers);
|
|
}
|
|
|
|
/* ATM init */
|
|
instance->atm_dev = atm_dev_register(instance->driver_name,
|
|
&udsl_atm_devops, -1, NULL);
|
|
if (!instance->atm_dev) {
|
|
dbg("udsl_usb_probe: failed to register ATM device!");
|
|
goto fail;
|
|
}
|
|
|
|
instance->atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
|
|
instance->atm_dev->ci_range.vci_bits = ATM_CI_MAX;
|
|
instance->atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
|
|
|
|
/* temp init ATM device, set to 128kbit */
|
|
instance->atm_dev->link_rate = 128 * 1000 / 424;
|
|
|
|
/* device description */
|
|
buf = instance->description;
|
|
length = sizeof(instance->description);
|
|
|
|
if ((i = usb_string(dev, dev->descriptor.iProduct, buf, length)) < 0)
|
|
goto finish;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
i = scnprintf(buf, length, " (");
|
|
buf += i;
|
|
length -= i;
|
|
|
|
if (length <= 0 || (i = usb_make_path(dev, buf, length)) < 0)
|
|
goto finish;
|
|
|
|
buf += i;
|
|
length -= i;
|
|
|
|
snprintf(buf, length, ")");
|
|
|
|
finish:
|
|
/* ready for ATM callbacks */
|
|
wmb();
|
|
instance->atm_dev->dev_data = instance;
|
|
|
|
usb_get_dev(dev);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
for (i = 0; i < num_snd_bufs; i++)
|
|
kfree(instance->send_buffers[i].base);
|
|
|
|
for (i = 0; i < num_snd_urbs; i++)
|
|
usb_free_urb(instance->senders[i].urb);
|
|
|
|
for (i = 0; i < num_rcv_bufs; i++)
|
|
kfree(instance->receive_buffers[i].base);
|
|
|
|
for (i = 0; i < num_rcv_urbs; i++)
|
|
usb_free_urb(instance->receivers[i].urb);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void udsl_instance_disconnect(struct udsl_instance_data *instance)
|
|
{
|
|
int i;
|
|
|
|
dbg("udsl_instance_disconnect entered");
|
|
|
|
if (!instance) {
|
|
dbg("udsl_instance_disconnect: NULL instance!");
|
|
return;
|
|
}
|
|
|
|
/* receive finalize */
|
|
tasklet_disable(&instance->receive_tasklet);
|
|
|
|
for (i = 0; i < num_rcv_urbs; i++)
|
|
usb_kill_urb(instance->receivers[i].urb);
|
|
|
|
/* no need to take the spinlock */
|
|
INIT_LIST_HEAD(&instance->filled_receive_buffers);
|
|
INIT_LIST_HEAD(&instance->spare_receive_buffers);
|
|
|
|
tasklet_enable(&instance->receive_tasklet);
|
|
|
|
for (i = 0; i < num_rcv_urbs; i++)
|
|
usb_free_urb(instance->receivers[i].urb);
|
|
|
|
for (i = 0; i < num_rcv_bufs; i++)
|
|
kfree(instance->receive_buffers[i].base);
|
|
|
|
/* send finalize */
|
|
tasklet_disable(&instance->send_tasklet);
|
|
|
|
for (i = 0; i < num_snd_urbs; i++)
|
|
usb_kill_urb(instance->senders[i].urb);
|
|
|
|
/* no need to take the spinlock */
|
|
INIT_LIST_HEAD(&instance->spare_senders);
|
|
INIT_LIST_HEAD(&instance->spare_send_buffers);
|
|
instance->current_buffer = NULL;
|
|
|
|
tasklet_enable(&instance->send_tasklet);
|
|
|
|
for (i = 0; i < num_snd_urbs; i++)
|
|
usb_free_urb(instance->senders[i].urb);
|
|
|
|
for (i = 0; i < num_snd_bufs; i++)
|
|
kfree(instance->send_buffers[i].base);
|
|
|
|
/* ATM finalize */
|
|
shutdown_atm_dev(instance->atm_dev);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(udsl_get_instance);
|
|
EXPORT_SYMBOL_GPL(udsl_put_instance);
|
|
EXPORT_SYMBOL_GPL(udsl_instance_setup);
|
|
EXPORT_SYMBOL_GPL(udsl_instance_disconnect);
|
|
|
|
/***********
|
|
** init **
|
|
***********/
|
|
|
|
static int __init udsl_usb_init(void)
|
|
{
|
|
dbg("udsl_usb_init: driver version " DRIVER_VERSION);
|
|
|
|
if (sizeof(struct udsl_control) > sizeof(((struct sk_buff *) 0)->cb)) {
|
|
printk(KERN_ERR __FILE__ ": unusable with this kernel!\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
|
|
|| (num_snd_urbs > UDSL_MAX_SND_URBS)
|
|
|| (num_rcv_bufs > UDSL_MAX_RCV_BUFS)
|
|
|| (num_snd_bufs > UDSL_MAX_SND_BUFS)
|
|
|| (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
|
|
|| (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit udsl_usb_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(udsl_usb_init);
|
|
module_exit(udsl_usb_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
|
|
/************
|
|
** debug **
|
|
************/
|
|
|
|
#ifdef VERBOSE_DEBUG
|
|
static int udsl_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
|