lkml.org 
[lkml]   [1999]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Synchronous board drivers
Date
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META content="MSHTML 5.00.2014.210" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>From: Paul Mackerras &lt;<A
href="mailto:paulus@cs.anu.edu.au">paulus@cs.anu.edu.au</A>&gt;<BR><BR>&gt; The
address and control bytes are really part of the medium-specific<BR>&gt;
encapsulation.&nbsp; The data will be in a skbuff with enough headroom
that<BR>&gt; the channel code can easily add them if it needs
them.<BR>&gt;<BR>&gt; Of course, 2 bytes is nothing, really, and if it makes
life easier for<BR>&gt; most types of channel I don't mind putting them
in.&nbsp; I thought they<BR>&gt; were really only used for async serial channels
though (and then<BR>&gt; usually compressed out anyway).&nbsp; On balance I
thought it was cleaner<BR>&gt; and neater not to have to worry about those 2
bytes in the generic ppp<BR>&gt; code.<BR>&gt;<BR>&gt;
Paul.<BR><BR>Paul:<BR><BR>The generic ppp code controls the LCP, but the LCP is
used to negotiate<BR>media specific options, such as AFCF compression, or
numbered transfer<BR>mode (RFC1663).<BR><BR>If the generic ppp code deals with
data starting at the ppp protocol ID<BR>field,<BR>how do you envision
communicating the results of the LCP negotiation<BR>to the channel which would
implement the option.<BR><BR>Or for that matter, how does the channel
communicate<BR>which options it supports. For example, PPP over X.25 (RFC1598)
does<BR>not permit the AFCF compression option.<BR><BR>If we wish to define a
generic sync adapter interface which just exchanges<BR>raw frames, does this
imply a channel layer between such an interface<BR>and the generic ppp? For
example: one channel for synchronous unnumbered,<BR>one for sync numbered, and
another for X.25. All of these channels have<BR>the generic sync board interface
on the bottom and a generic ppp interface<BR>on top?<BR><BR>Just
curious,<BR>Paul<BR><BR>Paul Fulghum <A
href="mailto:paulkf@microgate.com">paulkf@microgate.com</A><BR>Microgate
Corporation <A href="http://www.microgate.com">www.microgate.com</A><BR>9501
Capital of Texas Hwy<BR>Austin, Texas
78759<BR>(512)-345-7791<BR></FONT></DIV></BODY></HTML>
\
 
 \ /
  Last update: 2005-03-22 13:52    [W:0.290 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site