On 9/6/15, 1:46 PM, Roopa Prabhu wrote:
From: Roopa Prabhu <ro...@cumulusnetworks.com>
Problem:
The ecmp route replace support for ipv6 in the kernel, deletes the
existing ecmp route too early, ie when it installs the first nexthop.
If there is an error in installing the subsequent nexthops, its too late
to recover the already deleted existing route
This patch fixes the problem with the following:
a) Changes the existing multipath route add code to a two stage process:
build rt6_infos + insert them
ip6_route_add rt6_info creation code is moved into
ip6_route_info_create.
b) This ensures that all errors are caught during building rt6_infos
and we fail early
The other way I have been thinking of solving the problem is to mark the
sibling routes being replaced with some state
...so they can be restored on error. Still figuring out a way to do this
in a clean and non-intrusive way.
Or maybe just save the sibling routes (rt6_infos) being replaced in a
list and re-insert them on error.
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