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.TH "USB_CLAIM_BANDWIDTH" "9" "17 July 2003" "" ""

.SH NAME
usb_claim_bandwidth \- records bandwidth for a periodic transfer
.SH SYNOPSIS
.sp
\fB
.sp
void usb_claim_bandwidth  (struct usb_device * \fIdev\fB, struct urb * \fIurb\fB, int \fIbustime\fB, int \fIisoc\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIdev\fB\fR
source/target of request
.TP
\fB\fIurb\fB\fR
request (urb->dev == dev)
.TP
\fB\fIbustime\fB\fR
bandwidth consumed, in (average) microseconds per frame
.TP
\fB\fIisoc\fB\fR
true iff the request is isochronous
.SH "DESCRIPTION"
.PP
Bus bandwidth reservations are recorded purely for diagnostic purposes.
HCDs are expected not to overcommit periodic bandwidth, and to record such
reservations whenever endpoints are added to the periodic schedule.
.PP
FIXME averaging per-frame is suboptimal.  Better to sum over the HCD's
entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
large its periodic schedule is.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.5.71.