Merge branch 'tc-batch' into net-next

Chris Mi says:

====================
Currently in tc batch mode, only one command is read from the batch
file and sent to kernel to process. With this patchset, at most 128
commands can be accumulated before sending to kernel.

We introduced a new function in patch 1 to support for sending
multiple messages. In patch 2, we add this support for filter
add/delete/change/replace and actions add/change/replace commands.

But please note that kernel still processes the requests one by one.
To process the requests in parallel in kernel is another effort.
The time we're saving in this patchset is the user mode and kernel mode
context switch. So this patchset works on top of the current kernel.

Using the following script in kernel, we can generate 1,000,000 rules.
	tools/testing/selftests/tc-testing/tdc_batch.py

Without this patchset, 'tc -b $file' exection time is:

real    0m15.555s
user    0m7.211s
sys     0m8.284s

With this patchset, 'tc -b $file' exection time is:

real    0m12.360s
user    0m6.082s
sys     0m6.213s

The insertion rate is improved more than 10%.
====================

Signed-off-by: David Ahern <dsahern@gmail.com>