[ovs-dev] upcall processing in userspace

Jarno Rajahalme jrajahalme at nicira.com
Fri Aug 7 16:35:42 UTC 2015


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”



> 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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