netdev - Re: [patch net-next v2 03/12] ipmr: Add FIB notification access functions

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Date:   Mon, 25 Sep 2017 12:40:16 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, yotamg@...lanox.com, idosch@...lanox.com,
        mlxsw@...lanox.com, andrew@...n.ch
Subject: Re: [patch net-next v2 03/12] ipmr: Add FIB notification access
 functions

On 25/09/17 12:35, Nikolay Aleksandrov wrote:
> On 24/09/17 20:22, Jiri Pirko wrote:
>> From: Yotam Gigi <yotamg@...lanox.com>
>>
>> Make the ipmr module register as a FIB notifier. To do that, implement both
>> the ipmr_seq_read and ipmr_dump ops.
>>
>> The ipmr_seq_read op returns a sequence counter that is incremented on
>> every notification related operation done by the ipmr. To implement that,
>> add a sequence counter in the netns_ipv4 struct and increment it whenever a
>> new MFC route or VIF are added or deleted. The sequence operations are
>> protected by the RTNL lock.
>>
>> The ipmr_dump iterates the list of MFC routes and the list of VIF entries
>> and sends notifications about them. The entries dump is done under RCU
>> where the VIF dump uses the mrt_lock too, as the vif->dev field can change
>> under RCU.
>>
>> Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
>> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>> v1->v2:
>>  - Take the mrt_lock when dumping VIF entries.
>> ---
>>  include/linux/mroute.h   |  15 ++++++
>>  include/net/netns/ipv4.h |   3 ++
>>  net/ipv4/ipmr.c          | 137 ++++++++++++++++++++++++++++++++++++++++++++++-
>>  3 files changed, 153 insertions(+), 2 deletions(-)
>>
> 
> LGTM,
> 
> Reviewed-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> 
> 

One note here if you're going to spin another version of the set, you can
consider renaming the call_* functions to either mroute_* or ipmr_* (e.g.
ipmr_call_...). I personally prefer the ipmr prefix.