netdev - Re: [PATCH net-next v3 0/4] net: ipv6: Improve user experience with multipath routes

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Date:   Mon, 30 Jan 2017 08:23:27 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     nicolas.dichtel@...nd.com, Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 0/4] net: ipv6: Improve user experience with
 multipath routes

On 1/30/17 4:07 AM, Nicolas Dichtel wrote:
> Le 29/01/2017 à 19:02, David Ahern a écrit :
> [snip]
>> Data centers are moving to L3, and multipath is a big part of that. Anyone who looks at ip -6 route enough knows it gets painful mentally pulling the individual routes into a single one.
> I agree, but it's only an iproute2 problem. iproute2 could group routes to have
> a better output, there is no need to have a kernel patch for this ;-)
> 

iproute2 is not the only rtnetlink user. The comment above uses ip show as an example. libnl has a workaround for IPv6 to update route objects versus replacing them - unnecessary complexity that does not need to replicated to iproute2, Quagga/FRR or python libraries implementing rtnetlink. Really, RTA_MULTIPATH support in notifications should have been added when multipath support was added to the IPv6. Patch 3 is mostly a refactoring of rt6_fill_node to fill in nexthop information. This could have been done 4+ years ago when RTA_MULTIPATH route adds was added to the stack.