netdev - Re: [PATCH v4 net-next 09/11] net: Add IPv6 flow label to flow

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Date:	Fri, 22 May 2015 08:14:21 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 net-next 09/11] net: Add IPv6 flow label to flow_keys

On Fri, May 22, 2015 at 1:14 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> Fri, May 22, 2015 at 02:11:44AM CEST, tom@...bertland.com wrote:
>>In flow_dissector set the flow label in flow_keys for IPv6. This also
>>removes the shortcircuiting of flow dissection when a non-zero label
>>is present, the flow label can be considered to provide additional
>>entropy for a hash.
>>
>>Signed-off-by: Tom Herbert <tom@...bertland.com>
>>---
>> include/net/flow_dissector.h |  4 +++-
>> net/core/flow_dissector.c    | 37 +++++++++++++------------------------
>> 2 files changed, 16 insertions(+), 25 deletions(-)
>>
>>diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
>>index 08480fb..effe607 100644
>>--- a/include/net/flow_dissector.h
>>+++ b/include/net/flow_dissector.h
>>@@ -28,7 +28,8 @@ struct flow_dissector_key_basic {
>> };
>>
>> struct flow_dissector_key_tags {
>>-      u32     vlan_id:12;
>>+      u32     vlan_id:12,
>>+              flow_label:20;
>> };
>>
>> /**
>>@@ -111,6 +112,7 @@ enum flow_dissector_key_id {
>>       FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
>>       FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
>>       FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
>>+      FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_label */
>
>
> I think it makes sense to pair FLOW_DISSECTOR_KEY_* with
> struct flow_dissector_key_*
>
> How about to have FLOW_DISSECTOR_KEY_TAGS istead of VLANID and FLOW_LABEL?
>

I thought about that, but it doesn't really save anything to be less
explicit as we still need a conditional at each occurrence. If someone
is only looking for IPv6 flow label and nothing else they are able to
do that.
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