[PATCH v3 1/2] RecipeCommon: add Offloads module

[Kamil Jerabek]

This module provides functions that are related to Offloads.

The function parse_offloads in the module is intended to be use for parsing
offloads alias.

It takes argument offloads string and returns tuple of used offloads and its
combinations.

Signed-off-by: Kamil Jerabek <kjerabek(a)redhat.com&gt;

---
v3 * parse_offloads modified to accept also offload "on" and offload name
     containing "-"
---
 lnst/RecipeCommon/Offloads.py | 53 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 lnst/RecipeCommon/Offloads.py

diff --git a/lnst/RecipeCommon/Offloads.py b/lnst/RecipeCommon/Offloads.py
new file mode 100644
index 0000000..b78bcf9
--- /dev/null
+++ b/lnst/RecipeCommon/Offloads.py
@@ -0,0 +1,53 @@
+"""
+This module defines the functions for Offloads tuning that can be imported
+directly into LNST Python tasks.
+
+Copyright 2016 Red Hat, Inc.
+Licensed under the GNU General Public License, version 2 as
+published by the Free Software Foundation; see COPYING for details.
+"""
+
+__author__ = """
+kjerabek(a)redhat.com (Kamil Jerabek)
+"""
+
+import re
+
+def parse_offloads(offloads):
+    """Parse offloads combination in string to list of tuple, containing
+    summary of all used offloads, and list of all offloads settings.
+    The function parse all offloads combination, in each set all offloads
+    are on except the ones specified as off.
+
+    Keyword arguments:
+    offloads -- string of offloads combination separated with ';'
+                Expected input: "tso on gso on tx off; tso off tx off ;rx
off".
+    """
+
+    if offloads is None:
+        return None
+
+    is_valid = re.compile(r"^([a-z\-]+\s+(off|on)(\s*[;]\s*|\s*))+$")
+    opts_split = re.compile(r".*?(?=;)|.+$")
+    opts_offloads_split = re.compile(r"([a-z]+(?=\s+(off|on)))+")
+    offloads_split = re.compile(r"([a-z\-]+)(?=\s+off|\s+on)")
+
+    if re.match(is_valid, offloads) is None:
+        raise Exception('Invalid offloads format')
+
+    offload_set = (list(set(re.findall(offloads_split, offloads))), [])
+    opts_match = filter(None, re.findall(opts_split, offloads))
+
+    for opts in opts_match:
+        sett = []
+        match = re.findall(opts_offloads_split, opts)
+
+        for offload in offload_set[0]:
+            if (offload, 'off') in match:
+                sett.append((offload, 'off'))
+            else:
+                sett.append((offload, 'on'))
+
+        offload_set[1].append(sett)
+
+    return offload_set
-- 
2.5.5