[ovs-dev] upcall processing in userspace

ravulakollu.kumar at wipro.com ravulakollu.kumar at wipro.com
Mon Aug 10 06:20:55 UTC 2015


Hi Jarno,

Thank you very much for your valuable information. ovs-appctl ofproto/trace gave me a good insight into action processing
in userspace.

Thanks & Regards,
Uday


-----Original Message-----
From: Jarno Rajahalme [mailto:jrajahalme at nicira.com]
Sent: Friday, August 07, 2015 10:06 PM
To: Ravulakollu Udaya Kumar (WT01 - Product Engineering Service)
Cc: dev at openvswitch.org
Subject: Re: [ovs-dev] upcall processing in userspace

Uday,

ofproto-dpif-upcall.c calls into ofproto-dpif-xlate.c that performs flow lookups and thereby find the actions that should be applied to the packet. For example, action types are discerned in do_xlate_actions(). The “normal” action is actually a special port number (OFPP_NORMAL) and is processed by late_output_action().

To see the flow lookups and action processing in action, you should get familiar with “ovs-appctl ofproto/trace”. You can find numerous examples by:

$ cd tests
$ git grep “ofproto/trace”

Regards,

  Jarno

> On Aug 7, 2015, at 7:57 AM, <ravulakollu.kumar at wipro.com> <ravulakollu.kumar at wipro.com> wrote:
>
> Hi Team,
>
> I am debugging upcall processing in ofproto-dpif-upcall.c  file . I am
> not able to visualize how opfbuf structure is being filled with actions(Note: My bridge is configured without OF rules, meaning actions=NORMAL).
> I could see packet is being flooded for unknown mac, vlan in the code.
> But somehow dpif_netlink_operate is receiving proper netlink action attributes in sequence to be executed in DP.
> Also I could see in gdb xout.odp_actions is only holding some addresses. How to know what actually resides in this address.
> (gdb) p upcall->xout.odp_actions->data
> $7 = (void *) 0x7f6275a53398
>
> Could someone please , let me know  how this buffer is being filled, and what is the importance of ofpbuf.
>
> Thanks in Advance,
> Uday
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