Veaceslav Falico 2f268f129c
net: add adj_list to save only neighbours ...
Currently, we distinguish neighbours (first-level linked devices) from
non-neighbours by the neighbour bool in the netdev_adjacent. This could be
quite time-consuming in case we would like to traverse *only* through
neighbours - cause we'd have to traverse through all devices and check for
this flag, and in a (quite common) scenario where we have lots of vlans on
top of bridge, which is on top of a bond - the bonding would have to go
through all those vlans to get its upper neighbour linked devices.
This situation is really unpleasant, cause there are already a lot of cases
when a device with slaves needs to go through them in hot path.
To fix this, introduce a new upper/lower device lists structure -
adj_list, which contains only the neighbours. It works always in
pair with the all_adj_list structure (renamed from upper/lower_dev_list),
i.e. both of them contain the same links, only that all_adj_list contains
also non-neighbour device links. It's really a small change visible,
currently, only for __netdev_adjacent_dev_insert/remove(), and doesn't
change the main linked logic at all.
Also, add some comments a fix a name collision in
netdev_for_each_upper_dev_rcu() and rework the naming by the following
rules:
netdev_(all_)(upper|lower)_*
If "all_" is present, then we work with the whole list of upper/lower
devices, otherwise - only with direct neighbours. Uninline functions - to
get better stack traces.
CC: "David S. Miller" <davem@davemloft.net >
CC: Eric Dumazet <edumazet@google.com >
CC: Jiri Pirko <jiri@resnulli.us >
CC: Alexander Duyck <alexander.h.duyck@intel.com >
CC: Cong Wang <amwang@redhat.com >
Signed-off-by: Veaceslav Falico <vfalico@redhat.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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