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

Andy Zhou azhou at nicira.com
Wed Jun 19 21:09:34 UTC 2013


The following patch is an incremental patch on top of yours.
 -- Fix a few small bugs introduced by the cleanup patch.
 -- Make mask list per table.

I believe this implementation will address the rcu lock issues we discussed
off line.

Would you please review?



On Tue, Jun 18, 2013 at 4:35 PM, Jesse Gross <jesse at nicira.com> wrote:

> 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
> confusion.
>  - 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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