Revision b03c720211ea5ec027ad85f1e147e3d8122429ba authored by Pyun YongHyeon on 14 January 2010, 21:54:20 UTC, committed by Pyun YongHyeon on 14 January 2010, 21:54:20 UTC
Add bus_dma(9) and endianness support to ste(4).
o Sorted includes and added missing header files.
o Added basic endianness support. In theory ste(4) should work on
any architectures.
o Remove the use of contigmalloc(9), contigfree(9) and vtophys(9).
o Added 8 byte alignment limitation of TX/RX descriptor.
o Added 1 byte alignment requirement for TX/RX buffers.
o ste(4) controllers does not support DAC. Limit DMA address space
to be within 32bit address.
o Added spare DMA map to gracefully recover from DMA map failure.
o Removed dead code for checking STE_RXSTAT_DMADONE bit. The bit
was already checked in each iteration of loop so it can't be true.
o Added second argument count to ste_rxeof(). It is used to limit
number of iterations done in RX handler. ATM polling is the only
consumer.
o Removed ste_rxeoc() which was added to address RX stuck issue
(cvs rev 1.66). Unlike TX descriptors, ST201 supports chaining
descriptors to form a ring for RX descriptors. If RX descriptor
chaining is not supported it's possible for controller to stop
receiving incoming frames once controller pass the end of RX
descriptor which in turn requires driver post new RX
descriptors to receive more frames. For TX descriptors which
does not support chaning, we exactly do manual chaining in
driver by concatenating new descriptors to the end of previous
TX chain.
Maybe the workaround was borrowed from other drivers that does
not support RX descriptor chaining, which is not valid for ST201
controllers. I still have no idea how this address RX stuck
issue and I can't reproduce the RX stuck issue on DFE-550TX
controller.
o Removed hw.ste_rxsyncs sysctl as the workaround was removed.
o TX/RX side bus_dmamap_load_mbuf_sg(9) support.
o Reimplemented optimized ste_encap().
o Simplified TX logic of ste_start_locked().
o Added comments for TFD/RFD requirements.
o Increased number of RX descriptors to 128 from 64. 128 gave much
better performance than 64 under high network loads.
1 parent d982c88
devd.8
.\"
.\" Copyright (c) 2002 M. Warner Losh.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd November 24, 2005
.Dt DEVD 8
.Os
.Sh NAME
.Nm devd
.Nd "device state change daemon"
.Sh SYNOPSIS
.Nm
.Op Fl Ddn
.Op Fl f Ar file
.Sh DESCRIPTION
The
.Nm
daemon provides a way to have userland programs run when certain
kernel events happen.
.Pp
The following options are accepted.
.Bl -tag -width ".Fl f Ar file"
.It Fl D
Enable debugging messages.
.It Fl d
Run in the foreground instead of becoming a daemon.
.It Fl f Ar file
Use configuration file
.Ar file
instead of the default
.Pa /etc/devd.conf .
If option
.Fl f
is specified more than once, the last file specified is used.
.It Fl n
Do not process all pending events before becoming a daemon.
Instead, call daemon right away.
.El
.Sh IMPLEMENTATION NOTES
The
.Nm
utility
is a system daemon that runs in the background all the time.
Whenever a device is added to or removed from the device tree,
.Nm
will execute actions specified in
.Xr devd.conf 5 .
For example,
.Nm
might execute
.Xr dhclient 8
when an Ethernet adapter is added to the system, and kill the
.Xr dhclient 8
instance when the same adapter is removed.
Another example would be for
.Nm
to use a table to locate and load via
.Xr kldload 8
the proper driver for an unrecognized device that is added to the system.
.Pp
The
.Nm
utility
hooks into the
.Xr devctl 4
device driver.
This device driver has hooks into the device configuration system.
When nodes are added or deleted from the tree, this device will
deliver information about the event to
.Nm .
Once
.Nm
has parsed the message, it will search its action list for that kind
of event and perform the action with the highest matching value.
For most mundane uses, the default handlers are adequate.
However, for more advanced users, the power is present to tweak every
aspect of what happens.
.Pp
The
.Nm
utility
reads
.Pa /etc/devd.conf
or the alternate configuration file specified with a
.Fl f
option and uses that file to drive the rest of the process.
While the format of this file is described in
.Xr devd.conf 5 ,
some basics are covered here.
In the
.Ic options
section, one can define multiple directories to search
for config files.
All files in these directories whose names match the pattern
.Pa *.conf
are parsed.
These files are intended to be installed by third party vendors that
wish to hook into the
.Nm
system without modifying the user's other
config files.
.Pp
All messages that
.Nm
receives are forwarded to the
.Ux
domain socket at
.Pa /var/run/devd.pipe .
.Sh FILES
.Bl -tag -width ".Pa /var/run/devd.pipe" -compact
.It Pa /etc/devd.conf
The default
.Nm
configuration file.
.It Pa /var/run/devd.pipe
The socket used by
.Nm
to communicate with its clients.
.El
.Sh SEE ALSO
.Xr devctl 4 ,
.Xr devd.conf 5
.Sh AUTHORS
.An M. Warner Losh
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