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

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Date:	Fri, 22 May 2015 17:22:32 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Tom Herbert <tom@...bertland.com>
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

Fri, May 22, 2015 at 05:14:21PM CEST, tom@...bertland.com wrote:
>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.

So have 2 structs then.
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