Date: Mon, 10 Mar 2008 22:26:39 +0100 From: Vitezslav Novy <vnovy@vnovy.net> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-current@freebsd.org, jfvogel@gmail.com Subject: Re: IP bad-len 0 ( on em0 ) Message-ID: <47D5A78F.1050403@vnovy.net> In-Reply-To: <006801c87f19$a14d8060$b6db87d4@multiplay.co.uk> References: <200802042142.38606.qpadla@gmail.com><200802061852.10227.qpadla@gmail.com> <47A9EA74.6040407@vnovy.net> <200802070018.54429.qpadla@gmail.com> <006801c87f19$a14d8060$b6db87d4@multiplay.co.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
Steven Hartland wrote: > Did you ever get anywhere with this? Did Jack respond? > > ----- Original Message ----- From: "Nikolay Pavlov" <qpadla@gmail.com> > > On Wednesday 06 February 2008 19:12:20 Vitezslav Novy wrote: >> >> Do you have set TSO flag on interface? >> > >> > Good catch. The problem is gone with net.inet.tcp.tso set to 0. >> > But TSO is enabled by default in 7.0. Could this be a em driver bug? >> >> I don't know. I only saw this when researched another TSO related >> problem. >> >> vita > > May be Jack could say something about this? > It is TSO related problem of em driver. Affects only cards with adapter->hw.mac.type < e1000_82575. During transmit function em_tso_setup is called and this function sets packet ip_len field to zero. (also ip csum) After successful transmit, packet is injected to BPF with zeroed ip_len field. vita
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?47D5A78F.1050403>