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authorPim van Pelt <pim@ipng.nl>2024-10-06 17:49:00 +0200
committerBenoit Ganne <bganne@cisco.com>2025-01-20 17:21:43 +0000
commite40f8a90bb0c39986c198fca8ad9b0b3c1658401 (patch)
tree6a6e55f5bff8a650f2171b60fdcee207e39f2f5b /docs/developer/corefeatures/fib/prerequisites.rst
parent26cb7184e1b2050ee86152be6fb6363cd7f0cc72 (diff)
sflow: initial checkin
This is an sFlow dataplane plugin that can sample 1-in-N packets from device-input, copying them to a FIFO queue and servicing that queue from a main process which formats them as Netlink PSAMPLEs, to be picked up by a popular sidecar agent called host-sflow. Type: feature Change-Id: Ic03456472e53309678f182dc8f74d3c81fb619e6 Signed-off-by: neil.mckee@inmon.com Signed-off-by: pim@ipng.nl
Diffstat (limited to 'docs/developer/corefeatures/fib/prerequisites.rst')
0 files changed, 0 insertions, 0 deletions
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from trex_stl_lib.api import *

class STLS1(object):

    def __init__ (self):
        self.max_pkt_size_l3  =9*1024;

    def create_stream (self):
        # pkt 
        p_l2  = Ether();
        p_l3  = IP(src="16.0.0.1",dst="48.0.0.1")
        p_l4  = UDP(dport=12,sport=1025)
        pyld_size = max(0, self.max_pkt_size_l3 - len(p_l3/p_l4));
        base_pkt = p_l2/p_l3/p_l4/('\x55'*(pyld_size))

        l3_len_fix =-(len(p_l2));
        l4_len_fix =-(len(p_l2/p_l3));


        # vm
        vm = STLScVmRaw( [ STLVmFlowVar(name="fv_rand", min_value=64, max_value=len(base_pkt), size=2, op="inc"),
                           STLVmTrimPktSize("fv_rand"), # total packet size
                           STLVmWrFlowVar(fv_name="fv_rand", pkt_offset= "IP.len", add_val=l3_len_fix), # fix ip len 
                           STLVmFixIpv4(offset = "IP"),                                # fix checksum
                           STLVmWrFlowVar(fv_name="fv_rand", pkt_offset= "UDP.len", add_val=l4_len_fix) # fix udp len  
                          ]
                       )

        pkt = STLPktBuilder(pkt = base_pkt,
                            vm = vm)

        return STLStream(packet = pkt,
                         mode = STLTXCont())



    def get_streams (self, direction = 0, **kwargs):
        # create 1 stream 
        return [ self.create_stream() ]


# dynamic load - used for trex console or simulator
def register():
    return STLS1()