[lnst] Add Slave methods for NetEm value parsing from interface config

[jtluka]

commit 12c045aa7f8c3017548d5795035aaa89c40a6a08
Author: Jan Tluka <jtluka(a)redhat.com&gt;
Date:   Fri May 22 14:13:24 2015 +0200

    Add Slave methods for NetEm value parsing from interface config
    
    This patch provides Slave methods for parsing values from NetEm
    tag in config dict.
    
    Signed-off-by: Jiri Prochazka <jprochaz(a)redhat.com&gt;
    Signed-off-by: Jan Tluka <jtluka(a)redhat.com&gt;
    Acked-by: Jiri Pirko <jiri(a)resnulli.us&gt;

 lnst/Slave/NetConfigCommon.py |   77 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 77 insertions(+), 0 deletions(-)
---
diff --git a/lnst/Slave/NetConfigCommon.py b/lnst/Slave/NetConfigCommon.py
index c60419b..ffcb0b4 100644
--- a/lnst/Slave/NetConfigCommon.py
+++ b/lnst/Slave/NetConfigCommon.py
@@ -35,3 +35,80 @@ def get_slave_option(netdev, slave_id, opt_name):
         if option == opt_name:
             return value
     return None
+
+def get_netem_option(netem_tag, netem_name, opt_name):
+    try:
+        options = netem_tag[netem_name]
+    except KeyError:
+        return None
+    for opt in options:
+        if opt["name"] == opt_name:
+            return opt["value"]
+
+def parse_delay(config):
+    time = get_netem_option(config, "delay", "time")
+    jitter= get_netem_option(config, "delay", "jitter")
+    correlation = get_netem_option(config, "delay", "correlation")
+    distribution = get_netem_option(config, "delay", "distribution")
+    rv = "delay %s " % time
+    if jitter is not None:
+        rv = rv + "%s " % jitter
+        if correlation is not None:
+            rv = rv + "%s " % correlation
+        if distribution is not None:
+                rv = rv + "distribution %s " % distribution
+    return rv
+
+def parse_loss(config):
+    percent = get_netem_option(config, "loss", "percent")
+    correlation = get_netem_option(config, "loss", "correlation")
+    rv = "loss %s " % percent
+    if correlation is not None:
+        rv = rv + "%s " % correlation
+    return rv
+
+def parse_corrupt(config):
+    percent = get_netem_option(config, "corrupt", "percent")
+    correlation = get_netem_option(config, "corrupt", "correlation")
+    rv = "corrupt %s " % percent
+    if correlation is not None:
+        rv = rv + "%s " % correlation
+    return rv
+
+def parse_duplication(config):
+    percent = get_netem_option(config, "duplication", "percent")
+    correlation = get_netem_option(config, "duplication",
"correlation")
+    rv = "duplicate %s " % percent
+    if correlation is not None:
+        rv = rv + "%s " % correlation
+    return rv
+
+def parse_reordering(config):
+    percent = get_netem_option(config, "reordering", "percent")
+    correlation = get_netem_option(config, "reordering",
"correlation")
+    gap_distance = get_netem_option(config, "reordering",
"gap_distance")
+    rv = "reorder %s " % percent
+    if correlation is not None:
+        rv = rv + "%s " % correlation
+    if gap_distance is not None:
+        rv = rv + "gap %s " % gap_distance
+    return rv
+
+def parse_netem(config):
+    rv = ""
+    # delay parsing
+    if "delay" in config:
+        rv = rv + parse_delay(config)
+    # loss parsing
+    if "loss" in config:
+        rv = rv + parse_loss(config)
+    # corrupt
+    if "corrupt" in config:
+        rv = rv + parse_corrupt(config)
+    # duplication
+    if "duplication" in config:
+        rv = rv + parse_duplication(config)
+    # reordering
+    if "reordering" in config:
+        rv = rv + parse_reordering(config)
+    return rv