1 files changed, 58 insertions, 0 deletions
diff --git a/scripts/stl/udp_1pkt_repeat_random.py b/scripts/stl/udp_1pkt_repeat_random.py
new file mode 100644
index 00000000..860970ed
--- /dev/null
+++ b/scripts/stl/udp_1pkt_repeat_random.py
@@ -0,0 +1,58 @@
+from trex_stl_lib.api import *
+
+# Example of STLVmFlowVarRepetableRandom instruction. 
+# in this case it generate repetable random numbers with limit/seed
+
+class STLS1(object):
+
+    def __init__ (self):
+        self.fsize  =64;
+
+    def create_stream (self, direction, cache_size):
+        # Create base packet and pad it to size
+        size = self.fsize - 4; # HW will add 4 bytes ethernet FCS
+        src_ip = '16.0.0.1'
+        dst_ip = '48.0.0.1'
+        if direction:
+            src_ip, dst_ip = dst_ip, src_ip
+
+        base_pkt = Ether()/IP(src=src_ip,dst=dst_ip)/UDP(dport=12,sport=1025)
+
+        pad = max(0, size - len(base_pkt)) * 'x'
+                             
+        vm = STLScVmRaw( [   STLVmFlowVar ( "ip_src",  min_value="10.0.0.1",
+                                            max_value="10.0.0.255", size=4, step=1,op="inc"),
+                             STLVmFlowVarRepetableRandom ( "ip_dst",  
+                                                           min_value="48.0.0.1",
+                                                           max_value="48.0.0.255", 
+                                                           size=4, 
+                                                           limit=16, seed=0x1235),
+
+                             STLVmWrFlowVar (fv_name="ip_src", pkt_offset= "IP.src" ), # write ip to packet IP.src
+                             STLVmWrFlowVar (fv_name="ip_dst", pkt_offset= "IP.dst" ), # write ip to packet IP.dst
+
+                             STLVmFixIpv4(offset = "IP")                                # fix checksum
+                                  ]
+                              ,split_by_field = "ip_src"  # split to cores base on the tuple generator 
+                              ,cache_size = cache_size # the cache size
+                              );
+
+        pkt = STLPktBuilder(pkt = base_pkt/pad,
+                            vm = vm)
+        stream = STLStream(packet = pkt,
+                         mode = STLTXCont())
+        #print(stream.to_code())
+        return stream
+
+
+    def get_streams (self, direction = 0, cache_size = 255, **kwargs):
+        # create 1 stream 
+        return [ self.create_stream(direction, cache_size) ]
+
+
+# dynamic load - used for trex console or simulator
+def register():
+    return STLS1()
+
+
+