• Nikolay Aleksandrov's avatar
    net: ipmr/ip6mr: add support for keeping an entry age · 43b9e127
    Nikolay Aleksandrov authored
    In preparation for hardware offloading of ipmr/ip6mr we need an
    interface that allows to check (and later update) the age of entries.
    Relying on stats alone can show activity but not actual age of the entry,
    furthermore when there're tens of thousands of entries a lot of the
    hardware implementations only support "hit" bits which are cleared on
    read to denote that the entry was active and shouldn't be aged out,
    these can then be naturally translated into age timestamp and will be
    compatible with the software forwarding age. Using a lastuse entry doesn't
    affect performance because the members in that cache line are written to
    along with the age.
    Since all new users are encouraged to use ipmr via netlink, this is
    exported via the RTA_EXPIRES attribute.
    Also do a minor local variable declaration style adjustment - arrange them
    longest to shortest.
    Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
    CC: Roopa Prabhu <roopa@cumulusnetworks.com>
    CC: Shrijeet Mukherjee <shm@cumulusnetworks.com>
    CC: Satish Ashok <sashok@cumulusnetworks.com>
    CC: Donald Sharp <sharpd@cumulusnetworks.com>
    CC: David S. Miller <davem@davemloft.net>
    CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
    CC: James Morris <jmorris@namei.org>
    CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
    CC: Patrick McHardy <kaber@trash.net>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>