netdev - Re: [PATCH net-next v5 2/3] bonding: modify the old and add new xmit hash policies

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Date:	Wed, 02 Oct 2013 05:03:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, andy@...yhouse.net,
	fubar@...ibm.com, vfalico@...hat.com
Subject: Re: [PATCH net-next v5 2/3] bonding: modify the old and add new
 xmit hash policies

On Wed, 2013-10-02 at 13:39 +0200, Nikolay Aleksandrov wrote:
> This patch adds two new hash policy modes which use skb_flow_dissect:
> 3 - Encapsulated layer 2+3
> 4 - Encapsulated layer 3+4
> There should be a good improvement for tunnel users in those modes.
> It also changes the old hash functions to:
> hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
> hash ^= (hash >> 16);
> hash ^= (hash >> 8);
> 
> Where hash will be initialized either to L2 hash, that is
> SRCMAC[5] XOR DSTMAC[5], or to flow->ports which should be extracted
> from the upper layer. Flow's dst and src are also extracted based on the
> xmit policy either directly from the buffer or by using skb_flow_dissect,
> but in both cases if the protocol is IPv6 then dst and src are obtained by
> ipv6_addr_hash() on the real addresses. In case of a non-dissectable
> packet, the algorithms fall back to L2 hashing.
> The bond_set_mode_ops() function is now obsolete and thus deleted
> because it was used only to set the proper hash policy. Also we trim a
> pointer from struct bonding because we no longer need to keep the hash
> function, now there's only a single hash function - bond_xmit_hash that
> works based on bond->params.xmit_policy.
> 
> The hash function and skb_flow_dissect were suggested by Eric Dumazet.
> The layer names were suggested by Andy Gospodarek, because I suck at
> semantics.
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
> ---

Very nice, thanks !

Acked-by: Eric Dumazet <edumazet@...gle.com>


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