The ixgbe driver strips vlan tags and this is by design as Todd mentioned this due to 8021P support. There are different cases where the result may differ based on the kernel version.
There is a long discussion regarding this issue here: sourceforge.net/p/e1000/bugs/355/ You can also modify the driver to not strip the vlan tags in all cases. Thanks, Emil >-----Original Message----- >From: Vijay Agrawal [mailto:vagra...@ixiacom.com] >Sent: Tuesday, February 04, 2014 4:55 AM >To: Fujinaka, Todd; e1000-de...@lists.sf.net >Subject: Re: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >Hi Todd, > >Basically it's only with vlan that 10G interface is not >working and we are using the latest driver ixgbe-3.18.7. >In last mail the packet was actually sent without VLAN so >there was no issue. >I have tested it more , and the problem reduced to this : > With VLAN the 10G driver is not accepting the vlan >tagged packets unless that vlan is configured on the >physical interface, we are using PF_PACKET sockets here and >we don't want to configure VLAN physically on the >interface. No such limitation exists on 1 G driver (igbvf). > >Here I have modified the simple program to explain the >problem in some more detail. >It has two programs here , sender and receiver. > >Suppose we are sending packets on interface eth0 and >receiving on interface eth1. >Run ethereal on interface eth0 and eth1 . > >Run Receiver on one interface as ># ./receiver interface_name >Example : ># ./receiver eth1 > >Run sender on one interface as ># ./sender interface_name with_vlan (1/0) ( 1(one) will >add vlan , 0(zero) will not). >Example : ># ./sender eth0 1 > >Now you will be able to observer that on interface eth0 , >the ethereal will show that one arp request is sent with >vlan in it , but at the same time you will receive nothing >on eth1, neither on ethereal nor , receiver program will say >anything. > >Now just run sender again without vlan as >#./sender eth0 0 > >Now u will observe that packet is successfully sent and >received , we can capture the packet on eth1 on ethereal and >receiver program will also dump the packet on console. > >Thanks & Regards > Vijay Agrawal > >-----Original Message----- >From: Fujinaka, Todd [mailto:todd.fujin...@intel.com] >Sent: 30 January 2014 03:25 >To: Vijay Agrawal; e1000-de...@lists.sf.net >Subject: RE: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >We don't seem to have any issues: > >>From the sender: ># ./test eth2 > > buffer is : FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF >FFFFFFFF FFFFFFFF 11 11 11 11 11 11 08 06 00 01 >08 00 06 04 00 01 11 11 11 11 11 11 11 11 11 >11 00 00 00 00 00 00 22 22 22 22 PF_PACKET: ARP >request sent 42 bytes > >On receiver: ># tcpdump -i eth2 -xxv >tcpdump: listening on eth2, link-type EN10MB (Ethernet), >capture size 65535 bytes >06:24:56.538905 ARP, Ethernet (len 6), IPv4 (len 4), Request >who-has 34.34.34.34 tell 17.17.17.17, length 46 > 0x0000: ffff ffff ffff 1111 1111 1111 0806 0001 > 0x0010: 0800 0604 0001 1111 1111 1111 1111 1111 > 0x0020: 0000 0000 0000 2222 2222 0000 0000 0000 > 0x0030: 0000 0000 0000 0000 0000 0000 > >Todd Fujinaka >Software Application Engineer >Networking Division (ND) >Intel Corporation >todd.fujin...@intel.com >(503) 712-4565 > > >-----Original Message----- >From: Vijay Agrawal [mailto:vagra...@ixiacom.com] >Sent: Tuesday, January 28, 2014 10:07 PM >To: Fujinaka, Todd; e1000-de...@lists.sf.net >Subject: RE: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >Hi Todd, > >Just wanted to help you to understand the issue we are >facing . >With static VLAN configured on the interface , hardware >sends the packet but vlan is stripped. >With PF_PACKET socket where we are constructing entire >Ethernet packet our self , the packet is dropped by the >hardware. > >I have attached a simple C program which uses PF_PACKET >SOCKET to send one test ARP packet with VLAN, and you can >clearly observe that packet is dropped. > >You can compile it with >Sudo make compile >Run it with > >./test "interface name (example eth0)" > >I hope it will help you to quickly identify the issue , and >may be you can suggest something to fix it or if you can >confirm if this is as expected as per design. > >Thanks & Regards > Vijay Agrawal > >-----Original Message----- >From: Vijay Agrawal >Sent: 29 January 2014 10:30 >To: 'Fujinaka, Todd'; e1000-de...@lists.sf.net >Subject: RE: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >Hi Todd, > >Thanks a lot for the response. >Can you please explain this a bit more. >When you say you are stripping the VLAN tags , so the >packet with VLAN tag should go out without VLAN tag , but >here we observe that no packet is going out , so it look >like the hardware drops the VLAN tag packet, we see no >packet on the ethereal. Can you please explain this ? >Is there any work around solution to work with VLAN? Or with >this driver it's just not possible. > >Thanks again for your quick response . > >Thanks & Regards > Vijay Agrawal > >-----Original Message----- >From: Fujinaka, Todd [mailto:todd.fujin...@intel.com] >Sent: 29 January 2014 02:04 >To: Vijay Agrawal; e1000-de...@lists.sf.net >Subject: RE: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >Our hardware strips VLAN tags in order to support Data >Center Bridging (I think the details are in 802.1Q for DCB). >DCB uses the same offset as VLAN tags and if we didn't strip >the tags we couldn't have interoperability between endpoints >that had DCB enabled and not enabled. > >Todd Fujinaka >Software Application Engineer >Networking Division (ND) >Intel Corporation >todd.fujin...@intel.com >(503) 712-4565 > > >-----Original Message----- >From: Vijay Agrawal [mailto:vagra...@ixiacom.com] >Sent: Monday, January 27, 2014 10:02 PM >To: e1000-de...@lists.sf.net >Subject: [E1000-devel] ixgbe-3.17.3 :VLAN tagged packets >does not work when using PF-PACKET socket > >Hi , > >We are observing a issue with this driver , we are using PF- >Packet sockets for sending receiving Ethernet packets, but >if the packet is Vlan tagged it is not sent/received on the >interface. Neither the packet is seen on the ethereal >capture. Here we are just using PF-PACKET socket and no IP >and Vlan is configured on the physical interface. >The same test if we run on 1 G node it works , so as it >seems there is some limitations with this 10G driver. >Can you please help. > >Thanks & Regards > Vijay Agrawal ------------------------------------------------------------------------------ Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
