diff options
| author | Mahesh Bandewar <maheshb@google.com> | 2017-01-09 15:05:54 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-10 20:47:12 -0500 |
| commit | da36e13cf653541e385a8d2ec2637fff6ea3461a (patch) | |
| tree | 3d86b8c8337e679806f77b875ee6564ebf6712dc | |
| parent | de28c99d71d91251713b67c545fa05b2b5e0d232 (diff) | |
ipvlan: improvise dev_id generation logic in IPvlan
The patch 009146d117b ("ipvlan: assign unique dev-id for each slave
device.") used ida_simple_get() to generate dev_ids assigned to the
slave devices. However (Eric has pointed out that) there is a shortcoming
with that approach as it always uses the first available ID. This
becomes a problem when a slave gets deleted and a new slave gets added.
The ID gets reassigned causing the new slave to get the same link-local
address. This side-effect is undesirable.
This patch adds a per-port variable that keeps track of the IDs
assigned and used as the stat-base for the IDR api. This base will be
wrapped around when it reaches the MAX (0xFFFE) value possibly on a
busy system where slaves are added and deleted routinely.
Fixes: 009146d117b ("ipvlan: assign unique dev-id for each slave device.")
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
CC: Eric Dumazet <edumazet@google.com>
CC: David Miller <davem@davemloft.org>
Signed-off-by: David S. Miller <davem@davemloft.net>