Rework vlan example to be 1:1, no mac learning

example that shows usages of maps, probe_read, get_current_pid helpers

$ ./task_switch.py

task_switch[ 2379->    0]=4
task_switch[ 3914->    0]=2
task_switch[ 3133->    0]=5
task_switch[10903->    0]=100  <-- 100 times python process switched into idle
task_switch[  116->    0]=1
task_switch[    0->   14]=1
task_switch[10803->    0]=1
task_switch[22292->    0]=1
task_switch[    0->22292]=1
task_switch[    0->10803]=1
task_switch[   30->    0]=1
task_switch[    0->10903]=100  <-- 100 times back into python
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

* Use ifindex instead of src_mac to program egress table
* Remove the static arp programming
* Get the example to work in python2
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Move shared example code into simulation.py

* Create a class for the examples to share, helps with IPDB cleanup and
  namespace creation.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Remove update() call from vlan example

* Breakage from previous commit
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Make python table accesses more pythonic

* Add [] support in BPF.Table class
* Remove uses of lookup/update
* Add del support
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

add get_current_pid/tgid/uid/gid/comm helpers

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

Automatically compute sizeof in bpf_trace_printk

* Addresses issue #61
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add example for BPF+tc rate limiting

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Adding an example to address #59, simulation of bandwidth sharing
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Compatibility fixes and pyroute2 examples

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* simple_tc shows using just IPRoute
* simple_ipdb shows using IPDB as well, slightly more complicated
 - If the exception handling is done as shown, hangs may result
 - If only IPRoute is used, this shouldn't be the case
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Add requirement on 'future' package to ensure backwards compatibility
 - If working in dev environment, do 'sudo pip install future'

Note: end-users installing a compiled package with pip should have
future installed as a dependency automatically.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

reduce test time for test_brb and test_brb2

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Automatically detect key/leaf type in clang

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Parse the key and leaf types used for table definition, and pass the
  type info back into python using a json transport
* Remove the subscript operator support
* Migrate the tests that are able to drop they Key/Leaf definition. Keep
  it around for the tests that are B/C compatible
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Cleanups for some build/compile failures

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

python commands module is removed in python 3, use subprocess

* Change ftw to nftw, and do depth-first tmpdir cleanup
* Scrub CROSS_COMPILE variable before kbuild_helpers
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Yhs dev

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Update readme and FAQs

Remove the BPF_EXPORT macro, use rewriter instead