From owner-freebsd-arch@FreeBSD.ORG Sun Jun 1 18:25:33 2008 Return-Path: Delivered-To: arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F19651065672; Sun, 1 Jun 2008 18:25:32 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85]) by mx1.freebsd.org (Postfix) with ESMTP id A15648FC2E; Sun, 1 Jun 2008 18:25:32 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from localhost (localhost [127.0.0.1]) by harmony.bsdimp.com (8.14.2/8.14.1) with ESMTP id m51INlxD032469; Sun, 1 Jun 2008 12:23:47 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Sun, 01 Jun 2008 12:25:24 -0600 (MDT) Message-Id: <20080601.122524.114765121.imp@bsdimp.com> To: rwatson@freebsd.org From: "M. Warner Losh" In-Reply-To: <20080526162427.X26343@fledge.watson.org> References: <5D4AF8D7-88A7-4197-A0FE-7CA992EE5F96@FreeBSD.org> <483AD498.6070207@FreeBSD.org> <20080526162427.X26343@fledge.watson.org> X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: arch@freebsd.org, bms@freebsd.org, current@freebsd.org, ade@freebsd.org, net@freebsd.org Subject: Re: HEAD UP: non-MPSAFE network drivers to be disabled X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Jun 2008 18:25:33 -0000 In message: <20080526162427.X26343@fledge.watson.org> Robert Watson writes: : : On Mon, 26 May 2008, Bruce M. Simpson wrote: : : >> Given that this is (a) 2008 and (b) 8.x we're talking about, are there : >> really that many consumers of SLIP to warrant it being carried forward at : >> all? : > : > It's kind of a basic. [C]SLIP has been historically handy to have around for : > situations which warrant it. Mind you, given that we have had tun(4) in the : > tree for years now, a userland implementation of SLIP is possible. : > : > As with all of these things it's down to someone sitting down and doing it. : > : > I'm not volunteering to support any of this as I don't use it myself (got : > enough on my plate), merely pointing out that support for SLIP in a system : > is something many people have taken for granted over the years, and for : > prototyping something or providing IP over a simple serial link without the : > configuration overhead of PPP, SLIP is something someone might be using. : > : > P.S. ahc(4) is commodity hardware, I think it can stay right where it is : > thank-you. : : My suspicion is that getting SLIP basically working in userspace is fairly : straight forward, SLiRP and friends have been doing this for years. I made my living for about a year working on TIA, which was a portable, userland implementation of PPP and SLIP/CSLIP. This was in about 1995 or so. It isn't that hard... : SLIP has its subtleties, but the current implementation is relatively : straight-forward, well-documented, etc. Yes, especially CSLIP. But frankly, they are a whole lot easier than PPP to get up and going... Warner