On Mon, Nov 11, 2019 at 12:24 PM Greg KH <greg@xxxxxxxxx> wrote: > > On Mon, Nov 11, 2019 at 11:40:51AM -0500, Jeffrey Walton wrote: > > On Mon, Nov 11, 2019 at 11:31 AM Greg KH <greg@xxxxxxxxx> wrote: > > > > > > On Mon, Nov 11, 2019 at 11:11:06AM -0500, Jeffrey Walton wrote: > > > > Hi Everyone, > > > > > > > > I'm having trouble with a C application that opens a USB modem. The > > > > application is not receiving some data from a USR modem. Conexant > > > > modems are OK. > > > > > > > > I'm working through > > > > https://www.kernel.org/doc/Documentation/usb/usbmon.txt . I found the > > > > modem at Bus=01 Dev=24: > > > > > > > > T: Bus=01 Lev=03 Prnt=07 Port=00 Cnt=01 Dev#= 24 Spd=480 MxCh= 0 > > > > D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > > > > P: Vendor=0baf ProdID=0303 Rev= 2.00 > > > > S: Manufacturer=U.S.Robotics > > > > S: Product=USB Modem > > > > > > > > This is where my confusion lies. It is not clear to me how to > > > > determine which socket to use for step #3 in usbmon.txt. Step #3 says: > > > > > > > > # cat /sys/kernel/debug/usb/usbmon/3u > /tmp/1.mon.out > > > > > > > > How do I determine which socket to use for Bus=01 Dev=24? > > > > > > From the above documentation, it says to use "3u" for all devices on the > > > 3rd bus. You want the 1st bus, right? So did you try using "1u"? > > > > > > I think wireshark can intrepret usbmon output, so maybe just use that > > > instead and point it at the USB bus you want to watch? > > > > Thanks Greg. > > > > I want Bus 1, but I want Device 24 (not all devices). > > That's not what usbmon will show. Look at wireshark and see if it can > filter the output for just that one device. > > There's also the old-style USB device snoop interface, that works on a > per-device level. Ack, thanks. Would you happen to know the old-style program name? I am having trouble finding it. Here's why I want to specify a device number: $ cat /sys/kernel/debug/usb/devices | grep -i -c 'Bus=01' 13 It is too much information for me to sift through. I'll do it if I have to, but I prefer the tools do the work for me (rather than me do the work of the tools). Jeff _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
