[ovs-discuss] Add arp flow error

Ben Pfaff blp at ovn.org
Mon Aug 1 15:41:04 UTC 2016


Jarno, do you have time to take a look at this sometime?  I don't
understand how it would happen, but if it does then it probably has
something to do with synchronization and you know how OVS userspace does
that really well.

Thanks,

Ben.

On Mon, Aug 01, 2016 at 12:13:03PM +0000, Yinpeijun wrote:
> 
> Hi ALL,
> 
> 	Here is the test scene which we used to generate the error.
> 
> 	1. add a bridge like "ovs-vsctl add-br br-int"
>     2. add a port to br-int "ovs-vsctl add-port br-int eth1"
> 	3. delete the default normal flow of it, "ovs-vsctl del-flows br-int"
> 	4. add arp reply flow, " ovs-ofctl add-flow br-int "hard_timeout=0,idle_timeout=0,priority=11115,nw_dst=193.168.101.11,arp,table=22,actions=move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[],mod_dl_src:00:16:3e:1d:33:b1,load:0x2->NXM_OF_ARP_OP[], move:NXM_NX_ARP_SHA[]->NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]->NXM_OF_ARP_TPA[],load:0x00163e1d33b1->NXM_NX_ARP_SHA[],load:0xc1a8650b->NXM_OF_ARP_SPA[],in_port""
> 
> 	If we use netperf/iperf send packets from other server physical nic to this eth1 and repeat to do step 4, we will get the follow error with a high probability.
> 
> 	OFPT_ERROR (xid=0x4): OFPFMFC_BAD_COMMAND OFPT_FLOW_MOD (xid=0x4):
> 	(***truncated to 64 bytes from 240***)
> 	00000000 01 0e 00 f0 00 00 00 04-00 30 20 ef 00 00 00 00 |.........0 .....|
> 	00000010 00 00 00 00 00 00 00 00-00 00 00 00 00 00 08 06 |................|
> 	00000020 00 00 00 00 00 00 00 00-c1 a8 69 0a 00 00 00 00 |..........i.....|
> 	00000030 00 00 00 00 00 00 00 00-16 00 00 00 00 00 2b 6b |..............+k|
> 
> 	We find that a revalidate thread may affects the step4. It may modify the connmgr's ofputil_protocol.
> 	
> 	This should be a bug , Could someone confirm this? Or any good way to solve the problem? 
> 	Hope to hear feedback.
> 
> 	Thanks,
> 	Ray
> 
> -----Original Message-----
> From: Yinpeijun 
> Sent: Wednesday, July 27, 2016 5:30 PM
> To: discuss at openvswitch.org
> Cc: Zhoulei (Ray); gaoxiaoqiu; Zhbzg
> Subject: [ovs-discuss] Add arp flow error 
> 
> 
> Hi All,
> 
> I am trying to add some flows include a arp reply flow on OVS2.5.0, but getting a small probability error.
> 
> OFPT_ERROR (xid=0x4): OFPFMFC_BAD_COMMAND OFPT_FLOW_MOD (xid=0x4):
> (***truncated to 64 bytes from 240***)
> 00000000 01 0e 00 f0 00 00 00 04-00 30 20 ef 00 00 00 00 |.........0 .....|
> 00000010 00 00 00 00 00 00 00 00-00 00 00 00 00 00 08 06 |................|
> 00000020 00 00 00 00 00 00 00 00-c1 a8 69 0a 00 00 00 00 |..........i.....|
> 00000030 00 00 00 00 00 00 00 00-16 00 00 00 00 00 2b 6b |..............+k|
> 
> The command I used is this:
> ovs-ofctl add-flow br-tun "hard_timeout=0,idle_timeout=0,priority=11115,nw_dst=193.168.101.11,arp,table=22,actions=move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[],mod_dl_src:00:16:3e:1d:33:b1,load:0x2->NXM_OF_ARP_OP[], move:NXM_NX_ARP_SHA[]->NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]->NXM_OF_ARP_TPA[],load:0x00163e1d33b1->NXM_NX_ARP_SHA[],load:0xc1a8650b->NXM_OF_ARP_SPA[],in_port"
> 
> In ovs-vswitchd log file, I see a warning " |ofp_util|WARN|flow_mod has explicit table_id but flow_mod_table_id extension is not enabled ".
> But I re-add this flow again, it is OK and I can find this flow by using "ovs-ofctl dump-flows br-tun".
> 
> This error is hard to re-appear.
> I analyze the source file and see that the ofputil_protocol is not the correct value as I expect during ofputil_decode_flow_mod.
> 
> Is there any possibility that the ofputil_protocol will be modified?
> 
> 
> Thanks,
> Ray.
> 
> --------



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