[ovs-dev] [PATCH 1/2] datapath: Mega flow implementation

Jesse Gross jesse at nicira.com
Tue Jun 18 23:35:36 UTC 2013

On Tue, Jun 18, 2013 at 4:15 PM, Andy Zhou <azhou at nicira.com> wrote:
> Add wildcarded flow support in kernel datapath.
> Wildcarded flow can improve OVS flow set up performance by avoid sending
> matching new flows to the user space program. The exact performance boost
> will largely dependent on wildcarded flow hit rate.
> In case all new flows hits wildcard flows, the flow set up rate is
> within 5% of that of linux bridge module.
> Pravin has made significant contributions to this patch. Including API
> clean ups and bug fixes.
> Co-authored-by: Pravin B Shelar <pshelar at nicira.com>
> Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
> Signed-off-by: Andy Zhou <azhou at nicira.com>

I made some incremental changes, can you take a look to see if they
seem reasonable to you?

Here are the main blocks:
 - Additional interface documentation.
 - Fix memory leak when installing a new flow if there is an
allocation failure for the mask.
 - Require Ethernet addresses to be present in the key, as before.
 - Make SNAP handling a little more integrated with the rest of the
parsing and validation code.
 - Make ovs_flow_free() and ovs_deferred_flow_free() have exactly the
same behavior, just with the addition of RCU, to avoid possible
 - Return errors directly rather than through an intermediate variable
in ovs_flow_extract() and children.
 - Enforce an exact match for the outer EtherType for vlan packets,
similar to what we do for other protocols.
 - Miscellaneous style fixes.
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