netdev - Re: [PATCH] bonding: L2L3 xmit doesn't support IPv6

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Date:	Tue, 11 Oct 2011 20:27:51 -0700
From:	Yinglin Sun <yinglin.s@...il.com>
To:	Andy Gospodarek <andy@...yhouse.net>
Cc:	Jay Vosburgh <fubar@...ibm.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] bonding: L2L3 xmit doesn't support IPv6

On Tue, Oct 11, 2011 at 7:33 AM, Andy Gospodarek <andy@...yhouse.net> wrote:
> On Fri, Oct 07, 2011 at 10:36:45PM -0700, Yinglin Sun wrote:
>> Add IPv6 support in L2L3 xmit policy.
>> L3L4 doesn't support IPv6 either, and I'll try to fix that later.
>>
>> Signed-off-by: Yinglin Sun <Yinglin.Sun@....com>
>> ---
>>  drivers/net/bonding/bond_main.c |    7 +++++++
>>  1 files changed, 7 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>> index 6d79b78..d6fd282 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -41,8 +41,10 @@
>>  #include <linux/ptrace.h>
>>  #include <linux/ioport.h>
>>  #include <linux/in.h>
>> +#include <linux/in6.h>
>>  #include <net/ip.h>
>>  #include <linux/ip.h>
>> +#include <linux/ipv6.h>
>>  #include <linux/tcp.h>
>>  #include <linux/udp.h>
>>  #include <linux/slab.h>
>> @@ -3372,10 +3374,15 @@ static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
>>  {
>>       struct ethhdr *data = (struct ethhdr *)skb->data;
>>       struct iphdr *iph = ip_hdr(skb);
>> +     struct ipv6hdr *ipv6h = ipv6_hdr(skb);
>>
>>       if (skb->protocol == htons(ETH_P_IP)) {
>>               return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
>>                       (data->h_dest[5] ^ data->h_source[5])) % count;
>> +     } else if (skb->protocol == htons(ETH_P_IPV6)) {
>> +             return ((ntohl(ipv6h->saddr.s6_addr32[3] ^
>> +                            ipv6h->daddr.s6_addr32[3]) & 0xffff) ^
>> +                     (data->h_dest[5] ^ data->h_source[5])) % count;
>>       }
>>
>
> There have been some attempts to add support for ipv6 hashing this in
> the past, but none have been committed.  The best one I had seen was one
> that did some extensive testing one a wide variety of ipv6 traffic and
> it showed nice traffic distribution.  I'm not sure if it was ever posted
> upstream, so I will see if I can dig it up.
>
> Can you quantify how traffic was distributed with this algorithm?
>

My test was not extensive. I manually set some addresses which vary by
the last 32bit portion, and the traffic was distributed evenly across
slaves.

I agree that the real world IPv6 traffic should be used for more extensive test.

Yinglin
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