packetforge: add packetforge for generic flow to extras

Add a new tool packetforge to extras. This tool is to support generic flow.
Packetforge is a library to translate naming or json profile format flow
pattern to the required input of generic flow, i.e. spec and mask. Using
python script flow_create.py, it can add and enable a new flow rule for
an interface via flow VAPI, and can delete an existed flow rule as well.
Command examples are shown below. Json profile examples can be found in
./parsegraph/samples.

Naming format input:
python flow_create.py --add -p "mac()/ipv4(src=1.1.1.1,dst=2.2.2.2)/udp()"
-a "redirect-to-queue 3" -i 1
python flow_create.py --del -i 1 -I 0

Json profile format input:
python flow_create.py -f "./flow_rule_examples/mac_ipv4.json" -i 1

With this command, flow rule can be added or deleted, and the flow
entry can be listed with "show flow entry" command in VPP CLI.

Packetforge is based on a parsegraph. The parsegraph can be built by
users. A Spec can be found in ./parsegraph as guidance. More details
about packetforge are in README file.

Type: feature

Signed-off-by: Ting Xu <ting.xu@intel.com>
Change-Id: Ia9f539741c5dca27ff236f2bcc493c5dd48c0df1

1 files changed, 11 insertions, 0 deletions

diff --git a/extras/packetforge/StringFormat.py b/extras/packetforge/StringFormat.py
new file mode 100644
index 00000000000..a9fe0905aeb
--- /dev/null
+++ b/extras/packetforge/StringFormat.py
@@ -0,0 +1,11 @@
+import enum
+
+
+class StringFormat(enum.Enum):
+    mac = 0
+    ipv4 = 1
+    ipv6 = 2
+    u8 = 3
+    u16 = 4
+    u32 = 5
+    u64 = 6