[ovs-discuss] [ovs-dpdk] how to check link between guest vNIC and dpdkvhost socket

Flavio Leitner fbl at sysclose.org
Thu Oct 26 11:59:49 UTC 2017


On Thu, 26 Oct 2017 02:29:16 +0000
"Xu, Rongjie (NSB - CN/Hangzhou)" <rongjie.xu at nokia-sbell.com> wrote:

> Hi,
> 
> I do have the memAccess property as follows for both VM
> 
>   <cpu mode='host-model'>
>     <model fallback='allow'/>
>     <topology sockets='2' cores='1' threads='1'/>
>     <numa>
>       <cell id='0' cpus='0-1' memory='2097152' unit='KiB' memAccess='shared'/>
>     </numa>
>   </cpu>


Yes, but that's only one part. You also need the memoryBacking section
to be hugepages.

fbl



> 
> Best Regards
> Xu Rongjie (Max)
> 
> -----Original Message-----
> From: ovs-discuss-bounces at openvswitch.org [mailto:ovs-discuss-bounces at openvswitch.org] On Behalf Of Flavio Leitner
> Sent: Thursday, October 26, 2017 09:50
> To: Xu, Rongjie (NSB - CN/Hangzhou) <rongjie.xu at nokia-sbell.com>
> Cc: ovs-discuss at openvswitch.org
> Subject: Re: [ovs-discuss] [ovs-dpdk] how to link between guest vNIC and dpdkvhost socket
> 
> On Wed, 25 Oct 2017 07:36:13 +0000
> "Xu, Rongjie (NSB - CN/Hangzhou)" <rongjie.xu at nokia-sbell.com> wrote:
> 
> > Hi,
> > 
> > I have one OpenStack environment with OVS-DPDK (manually installed). I success to launch two VMs on two separate compute node with vhostuser interface type. But I cannot ping from one to another. I found there are even no packets in the local 'br-int' bridge (where dpdkvhostuser interface is attached). My guess is the link between guest vNIC and dpdkvhost socket at host side is somehow broken, but I do not know how to proceed. Anyone any suggestions?  
> 
> 
> Most probably you forgot to share the memory between host and guest.
> in the VM xml:
> 
> E.g.:
>   <memoryBacking>
>     <hugepages>
>       <page size='2' unit='M' nodeset='0'/>
>     </hugepages>
>   </memoryBacking>
> ...
>     <numa>
>       <cell id='0' cpus='0-1' memory='4194304' unit='KiB' memAccess='shared'/>
>     </numa>
> ...
> 
> fbl
> 
> > Compute0:
> >     Bridge br-int
> >         Controller "tcp:127.0.0.1:6633"
> >             is_connected: true
> >         fail_mode: secure
> >         Port "vhu2aae3928-3c"
> >             tag: 1
> >             Interface "vhu2aae3928-3c"
> >                 type: dpdkvhostuser
> > root at compute0:~# file /var/run/openvswitch/vhu2aae3928-3c
> > /var/run/openvswitch/vhu2aae3928-3c: socket
> > 
> > Compute1:
> >     Bridge br-int
> >         Controller "tcp:127.0.0.1:6633"
> >             is_connected: true
> >         fail_mode: secure
> >         Port "vhuca25b420-6d"
> >             tag: 1
> >             Interface "vhuca25b420-6d"
> >                type: dpdkvhostuser
> > root at compute1:~# file /var/run/openvswitch/vhuca25b420-6d
> > /var/run/openvswitch/vhuca25b420-6d: socket
> > 
> > 
> > When I ping, I even does not find ARP packets in the br-int flow tables.
> > root at compute0:~# ovs-ofctl dump-flows br-int | grep "in_port=3"
> > cookie=0xb177d87a58ae18fe, duration=1927.889s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=10,icmp6,in_port=3,icmp_type=136 actions=resubmit(,24)
> > cookie=0xb177d87a58ae18fe, duration=1927.886s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=10,arp,in_port=3 actions=resubmit(,24)
> > cookie=0xb177d87a58ae18fe, duration=1927.893s, table=0, n_packets=0, n_bytes=0, idle_age=1927, priority=9,in_port=3 actions=resubmit(,25)
> > cookie=0xb177d87a58ae18fe, duration=1927.891s, table=24, n_packets=0, n_bytes=0, idle_age=1927, priority=2,icmp6,in_port=3,icmp_type=136,nd_target=fe80::f816:3eff:fed3:2116 actions=NORMAL
> > cookie=0xb177d87a58ae18fe, duration=1927.888s, table=24, n_packets=0, n_bytes=0, idle_age=1927, priority=2,arp,in_port=3,arp_spa=192.168.100.13 actions=resubmit(,25)
> > cookie=0xb177d87a58ae18fe, duration=1927.896s, table=25, n_packets=0, n_bytes=0, idle_age=1927, priority=2,in_port=3,dl_src=fa:16:3e:d3:21:16 actions=NORMAL
> > 
> > root at compute0:~# ovs-ofctl show br-int
> > OFPT_FEATURES_REPLY (xid=0x2): dpid:0000caf6709a034a
> > n_tables:254, n_buffers:256
> > capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
> > actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
> > 1(int-br0): addr:7e:de:e2:7b:2a:83
> >      config:     0
> >      state:      0
> >      speed: 0 Mbps now, 0 Mbps max
> > 2(patch-tun): addr:5a:2a:d3:f0:14:72
> >      config:     0
> >      state:      0
> >      speed: 0 Mbps now, 0 Mbps max
> > 3(vhu2aae3928-3c): addr:00:00:00:00:00:00
> >      config:     0
> >      state:      0
> >      speed: 0 Mbps now, 0 Mbps max
> > 
> > Best Regards
> > Xu Rongjie (Max)
> >   
> 
> 
> 



-- 
Flavio



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