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[PATCH] USB: Patch to make usbmon to print control setup packets

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Make usbmon to print Setup packets of Control transfers. This is useful
when debugging enumeration issues.

This is a change to the trace format which is not fully compatible.
A parser has to look at the data length word now. If that word is
a character like 's', read setup packet before proceeding with data.
I decided not to bump the API tag for this because not many such
parsers exist at this point.

Signed-off-by: Pete Zaitcev <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Pete Zaitcev 2005-06-25 14:32:59 -07:00 • committed by Greg Kroah-Hartman
commit ae0d6cceb2
2 changed files with 64 additions and 13 deletions
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29
Documentation/usb/usbmon.txt
View file

@ -101,6 +101,13 @@ Here is the list of words, from left to right:
or 3 and 2 positions, correspondingly.
- URB Status. This field makes no sense for submissions, but is present
to help scripts with parsing. In error case, it contains the error code.
In case of a setup packet, it contains a Setup Tag. If scripts read a number
in this field, the proceed to read Data Length. Otherwise, they read
the setup packet before reading the Data Length.
- Setup packet, if present, consists of 5 words: one of each for bmRequestType,
bRequest, wValue, wIndex, wLength, as specified by the USB Specification 2.0.
These words are safe to decode if Setup Tag was 's'. Otherwise, the setup
packet was present, but not captured, and the fields contain filler.
- Data Length. This is the actual length in the URB.
- Data tag. The usbmon may not always capture data, even if length is nonzero.
Only if tag is '=', the data words are present.
@ -125,25 +132,31 @@ class ParsedLine {
String data_str = st.nextToken();
int len = data_str.length() / 2;
int i;
int b; // byte is signed, apparently?! XXX
for (i = 0; i < len; i++) {
data[data_len] = Byte.parseByte(
data_str.substring(i*2, i*2 + 2),
16);
// data[data_len] = Byte.parseByte(
// data_str.substring(i*2, i*2 + 2),
// 16);
b = Integer.parseInt(
data_str.substring(i*2, i*2 + 2),
16);
if (b >= 128)
b *= -1;
data[data_len] = (byte) b;
data_len++;
}
}
}
}
This format is obviously deficient. For example, the setup packet for control
transfers is not delivered. This will change in the future.
This format may be changed in the future.
Examples:
An input control transfer to get a port status:
An input control transfer to get a port status.
d74ff9a0 2640288196 S Ci:001:00 -115 4 <
d74ff9a0 2640288202 C Ci:001:00 0 4 = 01010100
d5ea89a0 3575914555 S Ci:001:00 s a3 00 0000 0003 0004 4 <
d5ea89a0 3575914560 C Ci:001:00 0 4 = 01050000
An output bulk transfer to send a SCSI command 0x5E in a 31-byte Bulk wrapper
to a storage device at address 5: