linux-kernel - Re: [PATCH net-next v13 5/5] openvswitch: Add support for unique flow IDs.

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Date:	Wed, 21 Jan 2015 11:29:05 -0800
From:	Joe Stringer <joestringer@...ira.com>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCH net-next v13 5/5] openvswitch: Add support for unique flow IDs.

On 21 January 2015 at 10:31, Pravin Shelar <pshelar@...ira.com> wrote:
> On Tue, Jan 20, 2015 at 10:32 AM, Joe Stringer <joestringer@...ira.com> wrote:
>> Previously, flows were manipulated by userspace specifying a full,
>> unmasked flow key. This adds significant burden onto flow
>> serialization/deserialization, particularly when dumping flows.
>>
>> This patch adds an alternative way to refer to flows using a
>> variable-length "unique flow identifier" (UFID). At flow setup time,
>> userspace may specify a UFID for a flow, which is stored with the flow
>> and inserted into a separate table for lookup, in addition to the
>> standard flow table. Flows created using a UFID must be fetched or
>> deleted using the UFID.
>>
>> All flow dump operations may now be made more terse with OVS_UFID_F_*
>> flags. For example, the OVS_UFID_F_OMIT_KEY flag allows responses to
>> omit the flow key from a datapath operation if the flow has a
>> corresponding UFID. This significantly reduces the time spent assembling
>> and transacting netlink messages. With all OVS_UFID_F_OMIT_* flags
>> enabled, the datapath only returns the UFID and statistics for each flow
>> during flow dump, increasing ovs-vswitchd revalidator performance by 40%
>> or more.
>>
>> Signed-off-by: Joe Stringer <joestringer@...ira.com>
>
> Its almost ready. But I saw minor issues,
> few checkpatch.pl failures.
> in ovs_flow_cmd_new() we should use unmasked key to lookup in flow
> table for legacy case.

Thanks for review, I can send out a fresh version soon. Should I
resend the whole series or is just a new version of this patch
sufficient?
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