[PATCH v2 net-next 0/4] Fix event generation for actions batch Add/Delete mode

[Roman Mashak <mrv@mojatatu.com>]

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
#!/bin/bash
TC="sudo /mnt/iproute2.git/tc/tc"

$TC actions flush action gact
for i in `seq 1 $1`;
do
   cmd="action pass index $i "
   args=$args$cmd
done
$TC actions add $args
%
% ./tc-batch.sh 32
Error: Failed to fill netlink attributes while adding 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 the rest of actions will be updated in the
follow-up patches.

v2:
   Restructured patches to make them bisectable.

Roman Mashak (4):
  net sched actions: update Add/Delete action API with new argument
  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

 include/net/act_api.h |  4 +++-
 net/sched/act_api.c   | 63 ++++++++++++++++++++++++++++++++++++++++++++-------
 net/sched/act_gact.c  | 14 ++++++++++++
 net/sched/cls_api.c   |  3 ++-
 4 files changed, 74 insertions(+), 10 deletions(-)

-- 
2.7.4