When adding or deleting a batch of entries, the kernel sends upto
TCA_ACT_MAX_PRIO entries in an event to user space. However it does not
consider that the action sizes may vary and require different skb sizes.

For example :

% cat tc-batch.sh
TC="sudo /mnt/iproute2.git/tc/tc"

$TC actions flush action gact
for i in `seq 1 $1`;
   cmd="action pass index $i "
$TC actions add $args
% ./tc-batch.sh 32
Error: Failed to fill netlink attributes while deleting TC action.
We have an error talking to the kernel

This patchset introduces new callback in tc_action_ops, which calculates
the action size, and passes size to tcf_add_notify()/tcf_del_notify(). The
patch fixes act_gact and act_police, and the rest of actions will be
updated in the follow-up patches.

Roman Mashak (5):
  net sched actions: routines to calculate common TLVs size
  net sched actions: add new tc_action_ops callback
  net sched actions: calculate add/delete event message size.
  net sched actions: implement get_fill_size routine in act_gact
  net sched actions: implement get_fill_size routine in act_police

 include/net/act_api.h  |  6 ++++-
 net/sched/act_api.c    | 62 +++++++++++++++++++++++++++++++++++++++++++-------
 net/sched/act_gact.c   | 18 +++++++++++++++
 net/sched/act_police.c |  9 ++++++++
 net/sched/cls_api.c    |  3 ++-
 5 files changed, 88 insertions(+), 10 deletions(-)


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