linux-kernel - Re: [PATCH net-next v14 5/5] openvswitch: Add support for unique flow IDs.

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Message-ID: <CALnjE+ovJvdnW+PQFKqs4aRMApO=o=th6CGjM_DJdNLWrUVJPg@mail.gmail.com>
Date:	Wed, 21 Jan 2015 17:16:36 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Joe Stringer <joestringer@...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 v14 5/5] openvswitch: Add support for unique flow IDs.

On Wed, Jan 21, 2015 at 4:42 PM, 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>

Looks good.
Acked-by: Pravin B Shelar <pshelar@...ira.com>

Thanks.
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