On Thu, 20 Aug 2015, Felipe Balbi wrote:
> > > > - When using pattern = 1 as module parameters to compare the data, the
> > > > packet size must be same between host and device's.
> > >
> > > why ?
> >
> > The gadget stores the pattern data starting from 0 for each packet it
> > sends. But the host tests the pattern data starting from 0 only at the
> > beginning of the transfer; the host expects the pattern to continue
> > without resetting at packet boundaries (if the transfer length is
> > larger than the maxpacket size).
>
> then that's another bug which needs to be fixed :-)
Here's my attempt at a fix. Completely untested, but it does compile
without errors. Peter, do you mind trying this out?
Alan Stern
Index: usb-4.2/drivers/usb/misc/usbtest.c
===================================================================
--- usb-4.2.orig/drivers/usb/misc/usbtest.c
+++ usb-4.2/drivers/usb/misc/usbtest.c
@@ -303,11 +303,20 @@ static unsigned mod_pattern;
module_param_named(pattern, mod_pattern, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(mod_pattern, "i/o pattern (0 == zeroes)");
-static inline void simple_fill_buf(struct urb *urb)
+static unsigned get_maxpacket(struct usb_device *udev, int pipe)
+{
+ struct usb_host_endpoint *ep;
+
+ ep = usb_pipe_endpoint(udev, pipe);
+ return le16_to_cpup(&ep->desc.wMaxPacketSize);
+}
+
+static void simple_fill_buf(struct urb *urb)
{
unsigned i;
u8 *buf = urb->transfer_buffer;
unsigned len = urb->transfer_buffer_length;
+ unsigned maxpacket;
switch (pattern) {
default:
@@ -316,8 +325,9 @@ static inline void simple_fill_buf(struc
memset(buf, 0, len);
break;
case 1: /* mod63 */
+ maxpacket = get_maxpacket(urb->dev, urb->pipe);
for (i = 0; i < len; i++)
- *buf++ = (u8) (i % 63);
+ *buf++ = (u8) ((i % maxpacket) % 63);
break;
}
}
@@ -349,6 +359,7 @@ static int simple_check_buf(struct usbte
u8 expected;
u8 *buf = urb->transfer_buffer;
unsigned len = urb->actual_length;
+ unsigned maxpacket = get_maxpacket(urb->dev, urb->pipe);
int ret = check_guard_bytes(tdev, urb);
if (ret)
@@ -366,7 +377,7 @@ static int simple_check_buf(struct usbte
* with set_interface or set_config.
*/
case 1: /* mod63 */
- expected = i % 63;
+ expected = (i % maxpacket) % 63;
break;
/* always fail unsupported patterns */
default:
@@ -478,11 +489,12 @@ static void free_sglist(struct scatterli
}
static struct scatterlist *
-alloc_sglist(int nents, int max, int vary)
+alloc_sglist(int nents, int max, int vary, struct usbtest_dev *dev, int pipe)
{
struct scatterlist *sg;
unsigned i;
unsigned size = max;
+ unsigned maxpacket =
get_maxpacket(interface_to_usbdev(dev->intf), pipe);
if (max == 0)
return NULL;
@@ -511,7 +523,7 @@ alloc_sglist(int nents, int max, int var
break;
case 1:
for (j = 0; j < size; j++)
- *buf++ = (u8) (j % 63);
+ *buf++ = (u8) ((j % maxpacket) % 63);
break;
}
@@ -2175,7 +2187,7 @@ usbtest_ioctl(struct usb_interface *intf
"TEST 5: write %d sglists %d entries of %d bytes\n",
param->iterations,
param->sglen, param->length);
- sg = alloc_sglist(param->sglen, param->length, 0);
+ sg = alloc_sglist(param->sglen, param->length, 0, dev,
dev->out_pipe);
if (!sg) {
retval = -ENOMEM;
break;
@@ -2193,7 +2205,7 @@ usbtest_ioctl(struct usb_interface *intf
"TEST 6: read %d sglists %d entries of %d bytes\n",
param->iterations,
param->sglen, param->length);
- sg = alloc_sglist(param->sglen, param->length, 0);
+ sg = alloc_sglist(param->sglen, param->length, 0, dev,
dev->in_pipe);
if (!sg) {
retval = -ENOMEM;
break;
@@ -2210,7 +2222,7 @@ usbtest_ioctl(struct usb_interface *intf
"TEST 7: write/%d %d sglists %d entries 0..%d bytes\n",
param->vary, param->iterations,
param->sglen, param->length);
- sg = alloc_sglist(param->sglen, param->length, param->vary);
+ sg = alloc_sglist(param->sglen, param->length, param->vary,
dev, dev->out_pipe);
if (!sg) {
retval = -ENOMEM;
break;
@@ -2227,7 +2239,7 @@ usbtest_ioctl(struct usb_interface *intf
"TEST 8: read/%d %d sglists %d entries 0..%d bytes\n",
param->vary, param->iterations,
param->sglen, param->length);
- sg = alloc_sglist(param->sglen, param->length, param->vary);
+ sg = alloc_sglist(param->sglen, param->length, param->vary,
dev, dev->in_pipe);
if (!sg) {
retval = -ENOMEM;
break;
--
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