Date: Wed, 14 Dec 2011 11:59:18 -0800 From: YongHyeon PYUN <pyunyh@gmail.com> To: Andrea Venturoli <ml@netfence.it> Cc: freebsd-net@freebsd.org Subject: Re: Intel 82550 Pro/100 Ethernet and TSO troubles Message-ID: <20111214195918.GC11426@michelle.cdnetworks.com> In-Reply-To: <4EE8FA10.8090502@netfence.it> References: <4EE8FA10.8090502@netfence.it>
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On Wed, Dec 14, 2011 at 08:33:36PM +0100, Andrea Venturoli wrote: > Hello. > > I recently installed 8.2 with the following card: > > > dmesg > > ... > >fxp0: <Intel 82550 Pro/100 Ethernet> port 0xdc00-0xdc3f mem > >0xfebfb000-0xfebfbfff,0xfebc0000-0xfebdffff irq 20 at device 5.0 on pci4 > > ... > > pciconv -lv > > ... > >fxp0@pci0:4:5:0: class=0x020000 card=0x00408086 chip=0x12298086 > >rev=0x0c hdr=0x00 > > vendor = 'Intel Corporation' > > device = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter' > > class = network > > subclass = ethernet > > ... > > I had weird problems, especially due to ICMP/fragmentation/MTU/... issues. > After hours spent in debugging, I noticed tcpdump showing ICMP packets > with wrong checksums and that TSO4 was enabled. > "ifconfig fxp0 -tso" seemed to solve everything. > > > Don't know if it's a bug in the card, in the driver or what... > Maybe it shouldn't be enabled by default? > AFAIK the firmware of controller has no known TSO issue so it indicates a bug in driver. What makes me wonder is ICMP ECHO packet should not be affected by TSO and I have no clue at this moment. (Here, I assume you've captured packets on receiver side since bpf sees packets before hardware computes checksum.) If you have a reliable way that reproduces the issue, let me know. > > > > I also have fxp1: > > dmesg > > ... > >fxp1: <Intel 82559 Pro/100 Ethernet> port 0xd880-0xd8bf mem 0xfebfa > >000-0xfebfafff,0xfea00000-0xfeafffff irq 21 at device 6.0 on pci4 > >... > >pciconv -lv > >... > >fxp1@pci0:4:6:0: class=0x020000 card=0x000c8086 chip=0x12298086 > >rev=0x08 hdr=0x00 > > vendor = 'Intel Corporation' > > device = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter' > > class = network > > subclass = ethernet > > ... > > TSO was not enabled on this by default. > TSO is available only on i82550/i82551. > > > > Feel free to ask, in case you need any further info. > > bye > av.
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