netdev - Re: [PATCH for kernel 3.4.x 1/1] net: neighbour: Add mcast_resolicit to configure the number of multicast resolicitations in PROBE state

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Date:	Wed, 25 Mar 2015 14:40:40 +0800
From:	yzhu1 <Yanjun.Zhu@...driver.com>
To:	YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>,
	<lizefan@...wei.com>, <netdev@...r.kernel.org>,
	<ulf.samuelsson@...csson.com>, <yoshfuji@...ux-ipv6.org>,
	<Alexandre.Dietsch@...driver.com>
Subject: Re: [PATCH for kernel 3.4.x 1/1] net: neighbour: Add mcast_resolicit
 to configure the number of multicast resolicitations in PROBE state

On 03/24/2015 06:35 PM, YOSHIFUJI Hideaki wrote:
> Hi.
>
> Zhu Yanjun wrote:
>
>> We send unicast neighbor (ARP or NDP) solicitations ucast_probes
>> times in PROBE state.  Zhu Yanjun reported that some implementation
>> does not reply against them and the entry will become FAILED, which
>> is undesirable.
>>
>> We had been dealt with such nodes by sending multicast probes mcast_
>> solicit times after unicast probes in PROBE state.  In 2003, I made
> I?  Or please Add the From: to change the author to me.
>
>> a change not to send them to improve compatibility with IPv6 NDP.
>>
>> Let's introduce per-protocol per-interface sysctl knob "mcast_
>> reprobe" to configure the number of multicast (re)solicitation for
>> reconfirmation in PROBE state.  The default is 0, since we have
>> been doing so for 10+ years.
>>
> You should say: 'This patch is based on commit foobar ("title") by
> author...' or something here.
>
>> Reported-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
>> CC: Ulf Samuelsson <ulf.samuelsson@...csson.com>
>> Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
>> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
>> [Zhu Yanjun: since kernel 3.4.x is different from mainline kernel(kernel 4.0-rcX).
>> This patch is modified a lot.]
>> Signed-off-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
>> ---
>>  include/linux/neighbour.h |  1 +
>>  include/net/neighbour.h   |  1 +
>>  net/core/neighbour.c      | 20 +++++++++++++++++---
>>  3 files changed, 19 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/neighbour.h b/include/linux/neighbour.h
>> index b188f68..6945f4f 100644
>> --- a/include/linux/neighbour.h
>> +++ b/include/linux/neighbour.h
>> @@ -112,6 +112,7 @@ enum {
>>  	NDTPA_APP_PROBES,		/* u32 */
>>  	NDTPA_UCAST_PROBES,		/* u32 */
>>  	NDTPA_MCAST_PROBES,		/* u32 */
>> +	NDTPA_MCAST_REPROBES,		/* u32 */
>>  	NDTPA_ANYCAST_DELAY,		/* u64, msecs */
>>  	NDTPA_PROXY_DELAY,		/* u64, msecs */
>>  	NDTPA_PROXY_QLEN,		/* u32 */
> No, this breaks binary compatibility.
Sorry. My bad. I will correct.

Best Regards!
Zhu Yanjun

>

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