Commit 6f749475 authored by Duncan Sands's avatar Duncan Sands Committed by Greg Kroah-Hartman
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[PATCH] USBATM: measure buffer size in bytes; force valid sizes 



Change the module parameters rcv_buf_size and snd_buf_size to
specify buffer sizes in bytes rather than ATM cells.  Since
there is some danger that users may not notice this change,
the parameters are renamed to rcv_buf_bytes etc.  The transmit
buffer needs to be a multiple of the ATM cell size in length,
while the receive buffer should be a multiple of the endpoint
maxpacket size (this wasn't enforced before, which causes trouble
with isochronous transfers), so enforce these restrictions.  Now
that the usbatm probe method inspects the endpoint maxpacket size,
minidriver bind routines need to set the correct alternate setting
for the interface in their bind routine.  This is the reason for
the speedtch changes.

Signed-off-by: default avatarDuncan Sands <baldrick@free.fr>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 227d7761

drivers/usb/atm/speedtch.c

+25 −5
Original line number Diff line number Diff line
@@ -89,6 +89,7 @@ MODULE_PARM_DESC(sw_buffering, 
		 "Enable software buffering (default: "

		 __MODULE_STRING(DEFAULT_SW_BUFFERING) ")");



#define INTERFACE_DATA		1

#define ENDPOINT_INT		0x81

#define ENDPOINT_DATA		0x07

#define ENDPOINT_FIRMWARE	0x05
@@ -98,6 +99,8 @@ MODULE_PARM_DESC(sw_buffering, 
struct speedtch_instance_data {

	struct usbatm_data *usbatm;



	unsigned int altsetting;



	struct work_struct status_checker;



	unsigned char last_status;
@@ -270,6 +273,11 @@ static int speedtch_upload_firmware(struct speedtch_instance_data *instance, 
	   because we're in our own kernel thread anyway. */

	msleep_interruptible(1000);



	if ((ret = usb_set_interface(usb_dev, INTERFACE_DATA, instance->altsetting)) < 0) {

		usb_err(usbatm, "%s: setting interface to %d failed (%d)!\n", __func__, instance->altsetting, ret);

		goto out_free;

	}



	/* Enable software buffering, if requested */

	if (sw_buffering)

		speedtch_set_swbuff(instance, 1);
@@ -586,11 +594,6 @@ static int speedtch_atm_start(struct usbatm_data *usbatm, struct atm_dev *atm_de 


	atm_dbg(usbatm, "%s entered\n", __func__);



	if ((ret = usb_set_interface(usb_dev, 1, altsetting)) < 0) {

		atm_dbg(usbatm, "%s: usb_set_interface returned %d!\n", __func__, ret);

		return ret;

	}



	/* Set MAC address, it is stored in the serial number */

	memset(atm_dev->esi, 0, sizeof(atm_dev->esi));

	if (usb_string(usb_dev, usb_dev->descriptor.iSerialNumber, mac_str, sizeof(mac_str)) == 12) {
@@ -725,6 +728,23 @@ static int speedtch_bind(struct usbatm_data *usbatm, 


	instance->usbatm = usbatm;



	/* altsetting may change at any moment, so take a snapshot */

	instance->altsetting = altsetting;



	if (instance->altsetting)

		if ((ret = usb_set_interface(usb_dev, INTERFACE_DATA, instance->altsetting)) < 0) {

			usb_err(usbatm, "%s: setting interface to %2d failed (%d)!\n", __func__, instance->altsetting, ret);

			instance->altsetting = 0; /* fall back to default */

		}



	if (!instance->altsetting) {

		if ((ret = usb_set_interface(usb_dev, INTERFACE_DATA, DEFAULT_ALTSETTING)) < 0) {

			usb_err(usbatm, "%s: setting interface to %2d failed (%d)!\n", __func__, DEFAULT_ALTSETTING, ret);

			goto fail_free;

		}

		instance->altsetting = DEFAULT_ALTSETTING;

	}



	INIT_WORK(&instance->status_checker, (void *)speedtch_check_status, instance);



	instance->status_checker.timer.function = speedtch_status_poll;

drivers/usb/atm/usbatm.c

+59 −31
Original line number Diff line number Diff line
@@ -99,12 +99,11 @@ static const char usbatm_driver_name[] = "usbatm"; 


#define UDSL_MAX_RCV_URBS		16

#define UDSL_MAX_SND_URBS		16

#define UDSL_MAX_RCV_BUF_SIZE		1024	/* ATM cells */

#define UDSL_MAX_SND_BUF_SIZE		1024	/* ATM cells */

#define UDSL_MAX_BUF_SIZE		64 * 1024	/* bytes */

#define UDSL_DEFAULT_RCV_URBS		4

#define UDSL_DEFAULT_SND_URBS		4

#define UDSL_DEFAULT_RCV_BUF_SIZE	64	/* ATM cells */

#define UDSL_DEFAULT_SND_BUF_SIZE	64	/* ATM cells */

#define UDSL_DEFAULT_RCV_BUF_SIZE	64 * ATM_CELL_SIZE	/* bytes */

#define UDSL_DEFAULT_SND_BUF_SIZE	64 * ATM_CELL_SIZE	/* bytes */



#define ATM_CELL_HEADER			(ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
@@ -112,8 +111,8 @@ static const char usbatm_driver_name[] = "usbatm"; 


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_size = UDSL_DEFAULT_RCV_BUF_SIZE;

static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;

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,
@@ -127,15 +126,15 @@ MODULE_PARM_DESC(num_snd_urbs, 
		 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "

		 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");



module_param(rcv_buf_size, uint, S_IRUGO);

MODULE_PARM_DESC(rcv_buf_size,

		 "Size of the buffers used for reception in ATM cells (range: 1-"

		 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "

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_size, uint, S_IRUGO);

MODULE_PARM_DESC(snd_buf_size,

		 "Size of the buffers used for transmission in ATM cells (range: 1-"

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_SND_BUF_SIZE) ", default: "

		 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
@@ -430,14 +429,14 @@ static unsigned int usbatm_write_cells(struct usbatm_data *instance, 
{

	struct usbatm_control *ctrl = UDSL_SKB(skb);

	struct atm_vcc *vcc = ctrl->atm.vcc;

	unsigned int num_written;

	unsigned int bytes_written;

	unsigned int stride = instance->tx_channel.stride;



	vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);

	UDSL_ASSERT(!(avail_space % stride));



	for (num_written = 0; num_written < avail_space && ctrl->len;

	     num_written += stride, target += 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;
@@ -480,7 +479,7 @@ static unsigned int usbatm_write_cells(struct usbatm_data *instance, 
			ctrl->crc = crc32_be(ctrl->crc, ptr, left);

	}



	return num_written;

	return bytes_written;

}
@@ -524,7 +523,7 @@ static void usbatm_tx_process(unsigned long 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;

	unsigned int bytes_written = 0;

	u8 *buffer = NULL;



	if (!skb)
@@ -536,16 +535,16 @@ static void usbatm_tx_process(unsigned long data) 
			if (!urb)

				break;		/* no more senders */

			buffer = urb->transfer_buffer;

			num_written = (urb->status == -EAGAIN) ?

			bytes_written = (urb->status == -EAGAIN) ?

				urb->transfer_buffer_length : 0;

		}



		num_written += usbatm_write_cells(instance, skb,

						  buffer + num_written,

						  buf_size - num_written);

		bytes_written += usbatm_write_cells(instance, skb,

						  buffer + bytes_written,

						  buf_size - bytes_written);



		vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",

		     __func__, num_written, skb, urb);

		     __func__, bytes_written, skb, urb);



		if (!UDSL_SKB(skb)->len) {

			struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
@@ -556,8 +555,8 @@ static void usbatm_tx_process(unsigned long data) 
			skb = skb_dequeue(&instance->sndqueue);

		}



		if (num_written == buf_size || (!skb && num_written)) {

			urb->transfer_buffer_length = num_written;

		if (bytes_written == buf_size || (!skb && bytes_written)) {

			urb->transfer_buffer_length = bytes_written;



			if (usbatm_submit_urb(urb))

				break;
@@ -990,6 +989,7 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 
	char *buf;

	int error = -ENOMEM;

	int i, length;

	unsigned int maxpacket, num_packets;



	dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",

			__func__, driver->driver_name,
@@ -1058,10 +1058,38 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 
	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;



	/* 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, 0);



	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;



#ifdef DEBUG

	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);

	}

#endif



	skb_queue_head_init(&instance->sndqueue);



	for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
@@ -1232,10 +1260,10 @@ static int __init usbatm_usb_init(void) 


	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))

	    || (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;

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