Re: usbdump(8) question

[Hans Petter Selasky]

On Thursday 19 April 2012 21:34:54 Yuri wrote:
 I am trying to use usbdump(8) on one webcam, but the produced, log
 causes some questions.


Hi,
 
 1. Why -s 1024 option doesn't show actual data even though SLEN for
 packets is non-zero?

The -s option must be set bigger than the maximum total data in a USB 
transfer, else you will only get parts of the data. Typical value: 65536

 2. When I run webcamd, first 4 lines of log (with the error) quickly
 appear. Webcamd exits quickly, in 0.035s, but usbdump after 1-2 secs
 shows the rest of the log. Why is this significant delay? Why the first
 4 lines aren't delayed?

Because usbdump uses a big buffer, which is only returned when it is filled up 
or when a 1 second timeout triggers.

--HPS
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usbdump(8) question

[Yuri]

I am trying to use usbdump(8) on one webcam, but the produced, log 
causes some questions.


1. Why -s 1024 option doesn't show actual data even though SLEN for 
packets is non-zero?
2. When I run webcamd, first 4 lines of log (with the error) quickly 
appear. Webcamd exits quickly, in 0.035s, but usbdump after 1-2 secs 
shows the rest of the log. Why is this significant delay? Why the first 
4 lines aren't delayed?


Yuri


--- usbdump log ---
# usbdump -i usbus3 -s 1024
12:32:19.151777 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:19.155753 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=28,IVAL=0,ERR=0

12:32:19.155772 usbus3.2 SUBM-CTRL-EP=,SPD=HIGH,NFR=2,SLEN=36,IVAL=0
12:32:19.159264 usbus3.2 
DONE-CTRL-EP=,SPD=HIGH,NFR=2,SLEN=0,IVAL=0,ERR=STALLED
... at this point webcamd process is ended, but the following lines 
appear after 1-2 secs. Why? ...

12:32:20.998845 usbus3.2 SUBM-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=8,IVAL=0
12:32:20.999006 usbus3.2 
DONE-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=0,IVAL=0,ERR=0

12:32:20.999019 usbus3.2 SUBM-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=0,IVAL=0
12:32:20.999129 usbus3.2 
DONE-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=0,IVAL=0,ERR=0

12:32:21.011833 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.013626 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=20,IVAL=0,ERR=0

12:32:21.014846 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.016000 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=4,IVAL=0,ERR=0

12:32:21.016014 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.017375 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=4,IVAL=0,ERR=0

12:32:21.017391 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.019250 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=4,IVAL=0,ERR=0

12:32:21.019264 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.021625 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=20,IVAL=0,ERR=0

12:32:21.021644 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.028876 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=12,IVAL=0,ERR=0

12:32:21.028891 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=8,IVAL=0
12:32:21.108758 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=1024,IVAL=0,ERR=0

12:32:21.108773 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=0,IVAL=0
12:32:21.191506 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=1024,IVAL=0,ERR=0

12:32:21.191522 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=0,IVAL=0
12:32:21.273003 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=1024,IVAL=0,ERR=0

12:32:21.273018 usbus3.2 SUBM-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=0,IVAL=0
12:32:21.286251 usbus3.2 
DONE-CTRL-EP=0080,SPD=HIGH,NFR=2,SLEN=196,IVAL=0,ERR=0

12:32:21.286269 usbus3.2 SUBM-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=8,IVAL=0
12:32:21.286374 usbus3.2 
DONE-CTRL-EP=,SPD=HIGH,NFR=1,SLEN=0,IVAL=0,ERR=0

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