[ovs-dev] [PATCH] ofproto-dpif : propagate may_enable flag as link aliveness

Zoltán Balogh zoltan.balogh at ericsson.com
Wed Mar 16 10:06:44 UTC 2016


Hi Ben,

Sorry, there was no question in my e-mail.

The thing is, that I sent a patch on 11th of February. Then you replied:
"This seems like a good start but I don't see anything that generates 
an OFPT_PORT_STATUS message when the LIVE bit gets set or unset"

So, I tried to explain how the OFPT_PORT_STATUS message will be generated after the LIVE bit is set/cleared. That was the purpose of the e-mail I sent on 1st of March.

Based on the explanation, is the patch acceptable? Is there something missing?

Best regards,
Zoltán

-----Original Message-----
From: Ben Pfaff [mailto:blp at ovn.org] 
Sent: Friday, March 11, 2016 6:56 PM
To: Zoltán Balogh
Cc: dev at openvswitch.org
Subject: Re: [ovs-dev] [PATCH] ofproto-dpif : propagate may_enable flag as link aliveness

Can you briefly state the question you're asking?  I didn't know how to respond to the previous email.

On Fri, Mar 11, 2016 at 10:42:26AM +0000, Zoltán Balogh wrote:
> Hi,
> 
> Could someone please respond to this e-mail or give any feedback?
> 
> Thank you,
> Zoltan
> 
> -----Original Message-----
> From: dev [mailto:dev-bounces at openvswitch.org] On Behalf Of Zoltán 
> Balogh
> Sent: Tuesday, March 01, 2016 1:41 PM
> To: Ben Pfaff
> Cc: dev at openvswitch.org
> Subject: Re: [ovs-dev] [PATCH] ofproto-dpif : propagate may_enable 
> flag as link aliveness
> 
> Hi Ben,
> 
> This small patch modifies the port_run( ) function in ofproto_dpif. This function is invoked indirectly from ofproto_run() when ofproto_class->run() is called.
> Sending of OFPT_PORT_STATUS message can be triggered by invoking update_port() in ofproto.
> 
> I tried to create a 'call tree' that shows where the LIVE bit is set/cleared and where OFPT_PORT_STATUS message can be sent to a controller. 
> We start from the main loop, that invokes bridge_run(), xxx_run(), xxx_wait(), poll_block() and so on.
> I used exclamation mark (!) to indicate where LIVE bit can be updated if needed and asterisk (*) to show where OFPT_PORT_STATUS can be sent via update_port().
> So, here comes the tree. It looks quite ugly in my outlook. It can be copy-pasted to an editor with fixed width character set to get a better look.
> 
>    main()
>     -> bridge_run()
>          +-> bridge_run__()
>          |     -> ofproto_run()
>          |          +-> ofproto_class->run() 
>  !       |          |     -> port_run() # updates OFPUTIL_PS_LIVE bit if needed !!!
>          |          |
>          |          +-> process_port_change()
>          |          |     +-> reinit_ports()
>  *       |          |     |     -> update_port()
>          |          |     |
>  *       |          |     +-> update_port()
>          |          |
>  *       |          +-> update_port()  
>          |
>          +-> bridge_reconfigure() 
>                +-> bridge_delete_or_reconfigure_ports()
>                |     -> ofproto_port_del()
>  *             |          -> update_port()
>                |
>                +-> bridge_add_ports()
>                |     -> bridge_add_ports__()
>                |          -> iface_create()
>                |               +-> iface_do_create()
>                |               |     -> ofproto_port_add()
>  *             |               |          -> update_port()
>                |               |          
>                |               +-> ofproto_port_add()
>  *             |                     -> update_port()
>                |                    
>                +-> bridge_run__()
>                      -> ofproto_run()
>                           +-> ofproto_class->run() 
>  !                        |     -> port_run() # updates OFPUTIL_PS_LIVE bit if needed !!!
>                           |    
>                           +-> process_port_change()
>                           |     +-> reinit_ports()
>  *                        |     |     -> update_port()
>                           |     |
>  *                        |     +-> update_port()
>                           |
>  *                        +-> update_port()
> 
> 
> So, you can see that LIVE bit is updated before update_port() can be called in each cycle of the main loop. When update_port() is called, it verifies if any properties of the port has changed. If it has then calls ofport_modified() which sends port status message to the controller.
> 
> I did a test with ovs-testcontroller in verbose mode. I created a bridge, added a physical port to it, then changed the port's state to up. 
> This is the controller ouput:
> 
> 2016-03-01T08:40:58Z|00050|vconn|DBG|tcp:192.168.2.145:42767: received: OFPT_PORT_STATUS (OF1.3) (xid=0x0): MOD: 1(eth3): addr:aa:55:aa:55:00:07
>      config:     0
>      state:      LINK_DOWN
>      speed: 0 Mbps now, 0 Mbps max
> 2016-03-01T08:40:58Z|00051|learning_switch|DBG|00006e81cdce5141: OpenFlow packet ignored: OFPT_PORT_STATUS (OF1.3) (xid=0x0): MOD: 1(eth3): addr:aa:55:aa:55:00:07
>      config:     0
>      state:      LINK_DOWN
>      speed: 0 Mbps now, 0 Mbps max
> 2016-03-01T08:40:58Z|00052|poll_loop|DBG|wakeup due to [POLLIN] on fd 
> 8 (192.168.2.145:6653<->192.168.2.145:42767) at lib/stream-fd.c:155
> 2016-03-01T08:40:58Z|00053|vconn|DBG|tcp:192.168.2.145:42767: received: OFPT_PORT_STATUS (OF1.3) (xid=0x0): MOD: 1(eth3): addr:aa:55:aa:55:00:07
>      config:     0
>      state:      LIVE
>      speed: 0 Mbps now, 0 Mbps max
> 2016-03-01T08:40:58Z|00054|learning_switch|DBG|00006e81cdce5141: OpenFlow packet ignored: OFPT_PORT_STATUS (OF1.3) (xid=0x0): MOD: 1(eth3): addr:aa:55:aa:55:00:07
>      config:     0
>      state:      LIVE
>      speed: 0 Mbps now, 0 Mbps max
> 
> 
> This is what ovs-ofctl shows before and after port state modification:
> 
> # ovs-ofctl show br
> OFPT_FEATURES_REPLY (xid=0x2): dpid:00006e81cdce5141 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(eth3): addr:aa:55:aa:55:00:07
>      config:     PORT_DOWN
>      state:      LINK_DOWN
>      speed: 0 Mbps now, 0 Mbps max
>  LOCAL(br): addr:6e:81:cd:ce:51:41
>      config:     PORT_DOWN
>      state:      LINK_DOWN
>      speed: 0 Mbps now, 0 Mbps max
> OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
> 
> # ovs-ofctl mod-port br eth3 up
> 
> # ovs-ofctl show br -OOpenFlow11
> OFPT_FEATURES_REPLY (OF1.1) (xid=0x2): dpid:00006e81cdce5141 
> n_tables:254, n_buffers:256
> capabilities: FLOW_STATS TABLE_STATS PORT_STATS GROUP_STATS 
> QUEUE_STATS ARP_MATCH_IP
>  1(eth3): addr:aa:55:aa:55:00:07
>      config:     0
>      state:      LIVE
>      speed: 0 Mbps now, 0 Mbps max
>  LOCAL(br): addr:6e:81:cd:ce:51:41
>      config:     PORT_DOWN
>      state:      LINK_DOWN
>      speed: 0 Mbps now, 0 Mbps max
> OFPT_GET_CONFIG_REPLY (OF1.1) (xid=0x4): frags=normal miss_send_len=0
> 
> 
> Well, the strange thing is that the vswitch sends two OFPT_PORT_STATUS messages. The first one indicates LINK_DOWN, the second one LIVE state. I'm not sure if this we should see.
> 
> Best regards,
> Zoltan
> 
> -----Original Message-----
> From: Ben Pfaff [mailto:blp at ovn.org]
> Sent: Monday, February 29, 2016 7:28 PM
> To: Zoltán Balogh
> Cc: dev at openvswitch.org
> Subject: Re: [ovs-dev] [PATCH] ofproto-dpif : propagate may_enable 
> flag as link aliveness
> 
> On Thu, Feb 11, 2016 at 02:29:07PM +0000, Zoltán Balogh wrote:
> > Hi,
> > 
> > The idea is to use OFPPS_LIVE bit to propagate link aliveness state towards the controller also when sending port status.
> > The ofport->may_enable flag could be used for this purpose. I updated some unit tests according to the changes of ofproto-dpif.
> > 
> > Signed-off-by: Zoltán Balogh <zoltan.balogh at ericsson.com>
> > Co-authored-by: László Sürü <laszlo.suru at ericsson.com>
> > Signed-off-by: László Sürü <laszlo.suru at ericsson.com>
> > Co-authored-by: Jan Scheurich <jan.scheurich at ericsson.com>
> > Signed-off-by: Jan Scheurich <jan.scheurich at ericsson.com>
> 
> Thank you for working on this!
> 
> This seems like a good start but I don't see anything that generates an OFPT_PORT_STATUS message when the LIVE bit gets set or unset.  OpenFlow requires that behavior:
> 
>    All port state bits are read-only and cannot be changed by the
>    controller. When the port flags are changed, the switch must send an
>    OFPT_PORT_STATUS message to notify the controller of the change.
> 
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