Date: Mon, 6 Jan 2003 14:43:20 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: wi0 and mtu setting [bad idea] Message-ID: <15897.56408.793022.131019@grasshopper.cs.duke.edu> In-Reply-To: <20030106.102538.57922346.imp@bsdimp.com> References: <20030106.100238.69366019.imp@bsdimp.com> <Pine.A41.4.10.10301061918340.116252-100000@bessel.tekniikka.turkuamk.fi> <20030106.102538.57922346.imp@bsdimp.com>
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M. Warner Losh writes: > > Well, this converstation needs to take place on the net@ list. In > -current, at least, if_ethersubr.c prevents 'ethernet' drivers from > setting the mtu higher. There's some experimental patches that make It doesn't prevent anything. It just sets the mtu to a default of ETHER_MTU, which is what 98% of ethernet drivers want. If you want something higher (or lower) as your default, you just need to reset the mtu after calling ether_ifattach(). For example, the following code at the bottom of my attach function has worked fine for years..: (GM_IP_MTU is 9K on some firmware, 4K on older firmware) #if (__FreeBSD_version >= 500000) ether_ifattach (ifp, sc->is_addr); #elif (__FreeBSD_version >= 410000) ether_ifattach (ifp, ETHER_BPF_SUPPORTED); #else if_attach (ifp); ether_ifattach (ifp); #endif /*ether_ifattach resets mtu */ ifp->if_mtu = GM_IP_MTU; return 0; Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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