// SPDX-License-Identifier: GPL-2.0+
/******************************************************************************
* usbatm.c - Generic USB xDSL driver core
*
* Copyright (C) 2001, Alcatel
* Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
* Copyright (C) 2004, David Woodhouse, Roman Kagan
******************************************************************************/
/*
* Written by Johan Verrept, Duncan Sands ([email protected]) and David Woodhouse
*
* 1.7+: - See the check-in logs
*
* 1.6: - No longer opens a connection if the firmware is not loaded
* - Added support for the speedtouch 330
* - Removed the limit on the number of devices
* - Module now autoloads on device plugin
* - Merged relevant parts of sarlib
* - Replaced the kernel thread with a tasklet
* - New packet transmission code
* - Changed proc file contents
* - Fixed all known SMP races
* - Many fixes and cleanups
* - Various fixes by Oliver Neukum ([email protected])
*
* 1.5A: - Version for inclusion in 2.5 series kernel
* - Modifications by Richard Purdie ([email protected])
* - made compatible with kernel 2.5.6 onwards by changing
* usbatm_usb_send_data_context->urb to a pointer and adding code
* to alloc and free it
* - remove_wait_queue() added to usbatm_atm_processqueue_thread()
*
* 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
* (reported by [email protected])
*
* 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
* - unlink all active send urbs of a vcc that is being closed.
*
* 1.3.1: - added the version number
*
* 1.3: - Added multiple send urb support
* - fixed memory leak and vcc->tx_inuse starvation bug
* when not enough memory left in vcc.
*
* 1.2: - Fixed race condition in usbatm_usb_send_data()
* 1.1: - Turned off packet debugging
*
*/
#include "usbatm.h"
#include <linux/uaccess.h>
#include <linux/crc32.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/sched/signal.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/kthread.h>
#include <linux/ratelimit.h>
#ifdef VERBOSE_DEBUG
static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len);
#define PACKETDEBUG(arg...) usbatm_print_packet(arg)
#define vdbg(arg...) dev_dbg(arg)
#else
#define PACKETDEBUG(arg...)
#define vdbg(arg...)
#endif
#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <[email protected]>"
#define DRIVER_DESC "Generic USB ATM/DSL I/O"
static const char usbatm_driver_name[] = "usbatm";
#define UDSL_MAX_RCV_URBS 16
#define UDSL_MAX_SND_URBS 16
#define UDSL_MAX_BUF_SIZE 65536
#define UDSL_DEFAULT_RCV_URBS 4
#define UDSL_DEFAULT_SND_URBS 4
#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
module_param(num_rcv_urbs, uint, S_IRUGO);
MODULE_PARM_DESC(num_rcv_urbs,
"Number of urbs used for reception (range: 0-"
__MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
__MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
module_param(num_snd_urbs, uint, S_IRUGO);
MODULE_PARM_DESC(num_snd_urbs,
"Number of urbs used for transmission (range: 0-"
__MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
__MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
module_param(rcv_buf_bytes, uint, S_IRUGO);
MODULE_PARM_DESC(rcv_buf_bytes,
"Size of the buffers used for reception, in bytes (range: 1-"
__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
__MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
module_param(snd_buf_bytes, uint, S_IRUGO);
MODULE_PARM_DESC(snd_buf_bytes,
"Size of the buffers used for transmission, in bytes (range: 1-"
__MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
__MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
/* receive */
struct usbatm_vcc_data {
/* vpi/vci lookup */
struct list_head list;
short vpi;
int vci;
struct atm_vcc *vcc;
/* raw cell reassembly */
struct sk_buff *sarb;
};
/* send */
struct usbatm_control {
struct atm_skb_data atm;
u32 len;
u32 crc;
};
#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
/* ATM */
static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
static int usbatm_atm_open(struct atm_vcc *vcc);
static void usbatm_atm_close(struct atm_vcc *vcc);
static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg);
static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page);
static const struct atmdev_ops usbatm_atm_devops = {
.dev_close = usbatm_atm_dev_close,
.open = usbatm_atm_open,
.close = usbatm_atm_close,
.ioctl = usbatm_atm_ioctl,
.send = usbatm_atm_send,
.proc_read = usbatm_atm_proc_read,
.owner = THIS_MODULE,
};
/***********
** misc **
***********/
static inline unsigned int usbatm_pdu_length(unsigned int length)
{
length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
return length - length % ATM_CELL_PAYLOAD;
}
static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
if (vcc->pop)
vcc->pop(vcc, skb);
else
dev_kfree_skb_any(skb);
}
/***********
** urbs **
************/
static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
{
struct urb *urb;
spin_lock_irq(&channel->lock);
if (list_empty(&channel->list)) {
spin_unlock_irq(&channel->lock);
return NULL;
}
urb = list_entry(channel->list.next, struct urb, urb_list);
list_del(&urb->urb_list);
spin_unlock_irq(&channel->lock);
return urb;
}
static int usbatm_submit_urb(struct urb *urb)
{
struct usbatm_channel *channel = urb->context;
int ret;
/* vdbg("%s: submitting urb 0x%p, size %u",
__func__, urb, urb->transfer_buffer_length); */
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret) {
if (printk_ratelimit())
atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
__func__, urb, ret);
/* consider all errors transient and return the buffer back to the queue */
urb->status = -EAGAIN;
spin_lock_irq(&channel->lock);
/* must add to the front when sending; doesn't matter when receiving */
list_add(&urb->urb_list, &channel->list);
spin_unlock_irq(&channel->lock);
/* make sure the channel doesn't stall */
mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
}
return ret;
}
static void usbatm_complete(struct urb *urb)
{
struct usbatm_channel *channel = urb->context;
unsigned long flags;
int status = urb->status;
/* vdbg("%s: urb 0x%p, status %d, actual_length %d",
__func__, urb, status, urb->actual_length); */
/* Can be invoked from task context, protect against interrupts */
spin_lock_irqsave(&channel->lock, flags);
/* must add to the back when receiving; doesn't matter when sending */
list_add_tail(&urb->urb_list, &channel->list);
spin_unlock_irqrestore(&channel->lock, flags);
if (unlikely(status) &&
(!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
status != -EILSEQ)) {
if (status == -ESHUTDOWN)
return;
if (printk_ratelimit())
atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
__func__, urb, status);
/* throttle processing in case of an error */
mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
} else
tasklet_schedule(&channel->tasklet);
}
/*************
** decode **
*************/
static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
short vpi, int vci)
{
struct usbatm_vcc_data *vcc_data;
list_for_each_entry(vcc_data, &instance->vcc_list, list)
if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
return vcc_data;
return NULL;
}
static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
{
struct atm_vcc *vcc;
struct sk_buff *sarb;
short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
u8 pti = ((source[3] & 0xe) >> 1);
if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
instance->cached_vpi = vpi;
instance->cached_vci = vci;
instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
if (!instance->cached_vcc)
atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
}
if (!instance->cached_vcc)
return;
vcc = instance->cached_vcc->vcc;
/* OAM F5 end-to-end */
if (pti == ATM_PTI_E2EF5) {
if (printk_ratelimit())
atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
__func__, vpi, vci);
atomic_inc(&vcc->stats->rx_err);
return;
}
sarb = instance->cached_vcc->sarb;
if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
__func__, sarb->len, vcc);
/* discard cells already received */
skb_trim(sarb, 0);
}
memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
__skb_put(sarb, ATM_CELL_PAYLOAD);
if (pti & 1) {
struct sk_buff *skb;
unsigned int length;
unsigned int pdu_length;
length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
/* guard against overflow */
if (length > ATM_MAX_AAL5_PDU) {
atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
__func__, length, vcc);
atomic_inc(&vcc->stats->rx_err);
goto out;
}
pdu_length = usbatm_pdu_length(length);
if (sarb->len < pdu_length) {
atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
__func__, pdu_length, sarb->len, vcc);
atomic_inc(&vcc->stats->rx_err);
goto out;
}
if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
__func__, vcc);
atomic_inc(&vcc->stats->rx_err);
goto out;
}
vdbg(&instance->usb_intf->dev,
"%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)",
__func__, length, pdu_length, vcc);
skb = dev_alloc_skb(length);
if (!skb) {
if (printk_ratelimit())
atm_err(instance, "%s: no memory for skb (length: %u)!\n",
__func__, length);
atomic_inc(&vcc->stats->rx_drop);
goto out;
}
vdbg(&instance->usb_intf->dev,
"%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)",
__func__, skb, skb->truesize);
if (!atm_charge(vcc, skb->truesize)) {
atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
__func__, skb->truesize);
dev_kfree_skb_any(skb);
goto out; /* atm_charge increments rx_drop */
}
skb_copy_to_linear_data(skb,
skb_tail_pointer(sarb) - pdu_length,
length);
__skb_put(skb, length);
vdbg(&instance->usb_intf->dev,
"%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
__func__, skb, skb->len, skb->truesize);
PACKETDEBUG(instance, skb->data, skb->len);
vcc->push(vcc, skb);
atomic_inc(&vcc->stats->rx);
out:
skb_trim(sarb, 0);
}
}
static void usbatm_extract_cells(struct usbatm_data *instance,
unsigned char *source, unsigned int avail_data)
{
unsigned int stride = instance->rx_channel.stride;
unsigned int buf_usage = instance->buf_usage;
/* extract cells from incoming data, taking into account that
* the length of avail data may not be a multiple of stride */
if (buf_usage > 0) {
/* we have a partially received atm cell */
unsigned char *cell_buf = instance->cell_buf;
unsigned int space_left = stride - buf_usage;
if (avail_data >= space_left) {
/* add new data and process cell */
memcpy(cell_buf + buf_usage, source, space_left);
source += space_left;
avail_data -= space_left;
usbatm_extract_one_cell(instance, cell_buf);
instance->buf_usage = 0;
} else {
/* not enough data to fill the cell */
memcpy(cell_buf + buf_usage, source, avail_data);
instance->buf_usage = buf_usage + avail_data;
return;
}
}
for (; avail_data >= stride; avail_data -= stride, source += stride)
usbatm_extract_one_cell(instance, source);
if (avail_data > 0) {
/* length was not a multiple of stride -
* save remaining data for next call */
memcpy(instance->cell_buf, source, avail_data);
instance->buf_usage = avail_data;
}
}
/*************
** encode **
*************/
static unsigned int usbatm_write_cells(struct usbatm_data *instance,
struct sk_buff *skb,
u8 *target, unsigned int avail_space)
{
struct usbatm_control *ctrl = UDSL_SKB(skb);
struct atm_vcc *vcc = ctrl->atm.vcc;
unsigned int bytes_written;
unsigned int stride = instance->tx_channel.stride;
for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
bytes_written += stride, target += stride) {
unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
unsigned int left = ATM_CELL_PAYLOAD - data_len;
u8 *ptr = target;
ptr[0] = vcc->vpi >> 4;
ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
ptr[2] = vcc->vci >> 4;
ptr[3] = vcc->vci << 4;
ptr[4] = 0xec;
ptr += ATM_CELL_HEADER;
skb_copy_from_linear_data(skb, ptr, data_len);
ptr += data_len;
__skb_pull(skb, data_len);
if (!left)
continue;
memset(ptr, 0, left);
if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
/* trailer[0] = 0; UU = 0 */
/* trailer[1] = 0; CPI = 0 */
trailer[2] = ctrl->len >> 8;
trailer[3] = ctrl->len;
ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4);
trailer[4] = ctrl->crc >> 24;
trailer[5] = ctrl->crc >> 16;
trailer[6] = ctrl->crc >> 8;
trailer[7] = ctrl->crc;
target[3] |= 0x2; /* adjust PTI */
ctrl->len = 0; /* tag this skb finished */
} else
ctrl->crc = crc32_be(ctrl->crc, ptr, left);
}
return bytes_written;
}
/**************
** receive **
**************/
static void usbatm_rx_process(struct tasklet_struct *t)
{
struct usbatm_data *instance = from_tasklet(instance, t,
rx_channel.tasklet);
struct urb *urb;
while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
vdbg(&instance->usb_intf->dev,
"%s: processing urb 0x%p", __func__, urb);
if (usb_pipeisoc(urb->pipe)) {
unsigned char *merge_start = NULL;
unsigned int merge_length = 0;
const unsigned int packet_size = instance->rx_channel.packet_size;
int i;
for (i = 0; i < urb->number_of_packets; i++) {
if (!urb->iso_frame_desc[i].status) {
unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
if (!merge_length)
merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
merge_length += actual_length;
if (merge_length && (actual_length < packet_size)) {
usbatm_extract_cells(instance, merge_start, merge_length);
merge_length = 0;
}
} else {
atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
if (merge_length)
usbatm_extract_cells(instance, merge_start, merge_length);
merge_length = 0;
instance->buf_usage = 0;
}
}
if (merge_length)
usbatm_extract_cells(instance, merge_start, merge_length);
} else
if (!urb->status)
usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
else
instance->buf_usage = 0;
if (usbatm_submit_urb(urb))
return;
}
}
/***********
** send **
***********/
static void usbatm_tx_process(struct tasklet_struct *t)
{
struct usbatm_data *instance = from_tasklet(instance, t,
tx_channel.tasklet);
struct sk_buff *skb = instance->current_skb;
struct urb *urb = NULL;
const unsigned int buf_size = instance->tx_channel.buf_size;
unsigned int bytes_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;
bytes_written = (urb->status == -EAGAIN) ?
urb->transfer_buffer_length : 0;
}
bytes_written += usbatm_write_cells(instance, skb,
buffer + bytes_written,
buf_size - bytes_written);
vdbg(&instance->usb_intf->dev,
"%s: wrote %u bytes from skb 0x%p to urb 0x%p",
__func__, bytes_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 (bytes_written == buf_size || (!skb && bytes_written)) {
urb->transfer_buffer_length = bytes_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;
spin_lock_irq(&instance->sndqueue.lock);
skb_queue_walk_safe(&instance->sndqueue, skb, n) {
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);
}
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;
/* racy disconnection check - fine */
if (!instance || instance->disconnected) {
#ifdef VERBOSE_DEBUG
printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
#endif
err = -ENODEV;
goto fail;
}
if (vcc->qos.aal != ATM_AAL5) {
atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
err = -EINVAL;
goto fail;
}
if (skb->len > ATM_MAX_AAL5_PDU) {
atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
__func__, skb->len, ATM_MAX_AAL5_PDU);
err = -EINVAL;
goto fail;
}
PACKETDEBUG(instance, 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);
tasklet_kill(&instance->rx_channel.tasklet);
tasklet_kill(&instance->tx_channel.tasklet);
usb_put_dev(instance->usb_dev);
kfree(instance);
}
static void usbatm_get_instance(struct usbatm_data *instance)
{
kref_get(&instance->refcount);
}
static void usbatm_put_instance(struct usbatm_data *instance)
{
kref_put(&instance->refcount, usbatm_destroy_instance);
}
/**********
** ATM **
**********/
static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
{
struct usbatm_data *instance = atm_dev->dev_data;
if (!instance)
return;
atm_dev->dev_data = NULL; /* catch bugs */
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)
return -ENODEV;
if (!left--)
return sprintf(page, "%s\n", instance->description);
if (!left--)
return sprintf(page, "MAC: %pM\n", atm_dev->esi);
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--) {
if (instance->disconnected)
return sprintf(page, "Disconnected\n");
else
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)
return -ENODEV;
/* only support AAL5 */
if ((vcc->qos.aal != ATM_AAL5)) {
atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
return -EINVAL;
}
/* sanity checks */
if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
return -EINVAL;
}
mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
if (instance->disconnected) {
atm_dbg(instance, "%s: disconnected!\n", __func__);
ret = -ENODEV;
goto fail;
}
if (usbatm_find_vcc(instance, vpi, vci)) {
atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
ret = -EADDRINUSE;
goto fail;
}
new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL);
if (!new) {
ret = -ENOMEM;
goto fail;
}
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_err(instance, "%s: no memory for SAR buffer!\n", __func__);
ret = -ENOMEM;
goto fail;
}
vcc->dev_data = new;
tasklet_disable(&instance->rx_channel.tasklet);
instance->cached_vcc = new;
instance->cached_vpi = vpi;
instance->cached_vci = vci;
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);
mutex_unlock(&instance->serialize);
atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
return 0;
fail:
kfree(new);
mutex_unlock(&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)
return;
usbatm_cancel_send(instance, vcc);
mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
tasklet_disable(&instance->rx_channel.tasklet);
if (instance->cached_vcc == vcc_data) {
instance->cached_vcc = NULL;
instance->cached_vpi = ATM_VPI_UNSPEC;
instance->cached_vci = ATM_VCI_UNSPEC;
}
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);
mutex_unlock(&instance->serialize);
}
static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
void __user *arg)
{
struct usbatm_data *instance = atm_dev->dev_data;
if (!instance || instance->disconnected)
return -ENODEV;
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. The ATM initialization scheme suffers from an intrinsic race
* condition: callbacks we register can be executed at once, before we have
* initialized the struct atm_dev. To protect against this, all callbacks
* abort if atm_dev->dev_data is NULL. */
atm_dev = atm_dev_register(instance->driver_name,
&instance->usb_intf->dev, &usbatm_atm_devops,
-1, NULL);
if (!atm_dev) {
usb_err(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_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
goto fail;
}
usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
/* ready for ATM callbacks */
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;
atm_dev_deregister(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;
allow_signal(SIGTERM);
complete(&instance->thread_started);
ret = instance->driver->heavy_init(instance, instance->usb_intf);
if (!ret)
ret = usbatm_atm_init(instance);
mutex_lock(&instance->serialize);
instance->thread = NULL;
mutex_unlock(&instance->serialize);
kthread_complete_and_exit(&instance->thread_exited, ret);
}
static int usbatm_heavy_init(struct usbatm_data *instance)
{
struct task_struct *t;
t = kthread_create(usbatm_do_heavy_init, instance, "%s",
instance->driver->driver_name);
if (IS_ERR(t)) {
usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
__func__, PTR_ERR(t));
return PTR_ERR(t);
}
instance->thread = t;
wake_up_process(t);
wait_for_completion(&instance->thread_started);
return 0;
}
static void usbatm_tasklet_schedule(struct timer_list *t)
{
struct usbatm_channel *channel = from_timer(channel, t, delay);
tasklet_schedule(&channel->tasklet);
}
static void usbatm_init_channel(struct usbatm_channel *channel)
{
spin_lock_init(&channel->lock);
INIT_LIST_HEAD(&channel->list);
timer_setup(&channel->delay, usbatm_tasklet_schedule, 0);
}
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;
unsigned int maxpacket, num_packets;
size_t size;
/* instance init */
size = struct_size(instance, urbs,
size_add(num_rcv_urbs, num_snd_urbs));
instance = kzalloc(size, GFP_KERNEL);
if (!instance)
return -ENOMEM;
/* public fields */
instance->driver = driver;
strscpy(instance->driver_name, driver->driver_name,
sizeof(instance->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:
if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
goto fail_free;
}
/* private fields */
kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
mutex_init(&instance->serialize);
instance->thread = NULL;
init_completion(&instance->thread_started);
init_completion(&instance->thread_exited);
INIT_LIST_HEAD(&instance->vcc_list);
skb_queue_head_init(&instance->sndqueue);
usbatm_init_channel(&instance->rx_channel);
usbatm_init_channel(&instance->tx_channel);
tasklet_setup(&instance->rx_channel.tasklet, usbatm_rx_process);
tasklet_setup(&instance->tx_channel.tasklet, usbatm_tx_process);
instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
else
instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
/* tx buffer size must be a positive multiple of the stride */
instance->tx_channel.buf_size = max(instance->tx_channel.stride,
snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
/* rx buffer size must be a positive multiple of the endpoint maxpacket */
maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint);
if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
usb_pipeendpoint(instance->rx_channel.endpoint));
error = -EINVAL;
goto fail_unbind;
}
num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
num_packets--;
instance->rx_channel.buf_size = num_packets * maxpacket;
instance->rx_channel.packet_size = maxpacket;
for (i = 0; i < 2; i++) {
struct usbatm_channel *channel = i ?
&instance->tx_channel : &instance->rx_channel;
dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n",
__func__, channel->buf_size, i ? "tx" : "rx", channel);
}
/* initialize urbs */
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
u8 *buffer;
struct usbatm_channel *channel = i < num_rcv_urbs ?
&instance->rx_channel : &instance->tx_channel;
struct urb *urb;
unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
if (!urb) {
error = -ENOMEM;
goto fail_unbind;
}
instance->urbs[i] = urb;
/* zero the tx padding to avoid leaking information */
buffer = kzalloc(channel->buf_size, GFP_KERNEL);
if (!buffer) {
error = -ENOMEM;
goto fail_unbind;
}
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 = channel->packet_size * j;
urb->iso_frame_desc[j].length = channel->packet_size;
}
}
/* put all tx URBs on the list of spares */
if (i >= num_rcv_urbs)
list_add_tail(&urb->urb_list, &channel->list);
vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p",
__func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
}
instance->cached_vpi = ATM_VPI_UNSPEC;
instance->cached_vci = ATM_VCI_UNSPEC;
instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
if (!instance->cell_buf) {
error = -ENOMEM;
goto fail_unbind;
}
if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && 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:
kfree(instance->cell_buf);
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);
struct usbatm_vcc_data *vcc_data;
int i;
if (!instance) {
dev_dbg(dev, "%s: NULL instance!\n", __func__);
return;
}
usb_set_intfdata(intf, NULL);
mutex_lock(&instance->serialize);
instance->disconnected = 1;
if (instance->thread != NULL)
send_sig(SIGTERM, instance->thread, 1);
mutex_unlock(&instance->serialize);
wait_for_completion(&instance->thread_exited);
mutex_lock(&instance->serialize);
list_for_each_entry(vcc_data, &instance->vcc_list, list)
vcc_release_async(vcc_data->vcc, -EPIPE);
mutex_unlock(&instance->serialize);
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);
/* turn usbatm_[rt]x_process into something close to a no-op */
/* 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);
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;
for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
kfree(instance->urbs[i]->transfer_buffer);
usb_free_urb(instance->urbs[i]);
}
kfree(instance->cell_buf);
/* ATM finalize */
if (instance->atm_dev) {
atm_dev_deregister(instance->atm_dev);
instance->atm_dev = NULL;
}
usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
}
EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
/***********
** init **
***********/
static int __init usbatm_usb_init(void)
{
if (sizeof(struct usbatm_control) > sizeof_field(struct sk_buff, cb)) {
pr_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_bytes < 1)
|| (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
|| (snd_buf_bytes < 1)
|| (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
return -EINVAL;
return 0;
}
module_init(usbatm_usb_init);
static void __exit usbatm_usb_exit(void)
{
}
module_exit(usbatm_usb_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/************
** debug **
************/
#ifdef VERBOSE_DEBUG
static int usbatm_print_packet(struct usbatm_data *instance,
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]);
dev_dbg(&instance->usb_intf->dev, "%s", buffer);
}
return i;
}
#endif
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