Date: Sat, 20 Aug 2011 03:11:00 +0100 From: Ben Hutchings <bhutchings@solarflare.com> To: Ben Gray <ben.r.gray@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Test tools for new network driver Message-ID: <1313806260.2814.57.camel@deadeye> In-Reply-To: <4E4E3522.6030207@gmail.com> References: <4E4E3522.6030207@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 2011-08-19 at 11:04 +0100, Ben Gray wrote: > Hi, > > I'm not sure if this the right list to post to, but here goes ... > > I'm currently writing a driver for the SMSC LAN95xx range of USB to > Ethernet adapter chips > (http://www.smsc.com/index.php?tid=300&pid=135&tab=1). The basic RX/TX > works and now I'm trying to get the H/W checksum offload working, > however I've come across some problems with the H/W implementation, e.g. > it doesn't work with small (<64 byte) packets. > > So I was wondering if anyone knows of any test tools I can use to > fire all the different unusual sort of packets at the interface to see > how the H/W csum reacts, i.e. runt packets, packets with IP options, > IPv6 packets with extension headers, etc. There are various commercial tools and test suites, and I would expect that most vendors of network controllers and IP blocks have their own test suites that attempt to cover this. I know Solarflare has used tools from Oktet Labs (see <http://www.oktetlabs.ru/test_env.rhtml>) among others. > Another question I had was; is there a kernel function to generate > a random MAC address ? Or is there a FreeBSD (or FOSS equivalent) > Ethernet manufacturer ID I could use for randomly generated MAC addresses ? [...] You can use any (almost) any address with byte 0 bit 0 cleared (not multicast) and byte 0 bit 1 set (locally assigned). I don't know whether FreeBSD has a function for this, but Linux has one which just gets 6 random bytes and then changes the first byte to conform to this. There are a small number of old OUIs which should be avoided; see <http://thread.gmane.org/gmane.linux.network/195545>. Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1313806260.2814.57.camel>