[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: Duncan Sands <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
commit 6f7494759870ec6fbb066f7202c5585fe36fbe82
tree 1fcff14ece062fefba2712b55ab4bddd05866425
parent 227d77611b31df5d9afa572b984f73640f54d490
author Duncan Sands <[EMAIL PROTECTED]> Fri, 13 Jan 2006 10:52:38 +0100
committer Greg Kroah-Hartman <[EMAIL PROTECTED]> Tue, 31 Jan 2006 17:23:40 -0800
drivers/usb/atm/speedtch.c | 30 ++++++++++++---
drivers/usb/atm/usbatm.c | 90 +++++++++++++++++++++++++++++---------------
2 files changed, 84 insertions(+), 36 deletions(-)
diff --git a/drivers/usb/atm/speedtch.c b/drivers/usb/atm/speedtch.c
index 43ec758..0e98167 100644
--- a/drivers/usb/atm/speedtch.c
+++ b/drivers/usb/atm/speedtch.c
@@ -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(stru
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 usb
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_d
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;
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index 98b74b9..1d829c2 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -99,12 +99,11 @@ static const char usbatm_driver_name[] =
#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[] =
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(s
{
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(s
ctrl->crc = crc32_be(ctrl->crc, ptr, left);
}
- return num_written;
+ return bytes_written;
}
@@ -524,7 +523,7 @@ static void usbatm_tx_process(unsigned l
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 l
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 l
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_interfac
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_interfac
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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