[LTP] [RFC PATCH v8 08/11] network/stress: Fix and cleanup route IPv4 tests

[Alexey Kodanev]

On 23.08.2017 0:22, Petr Vorel wrote:
> Hi Alexey,
>
>>> Tests using route_test_change() use background traffic instead of ns-udpsender
>>> but I fixed it that it uses route. Is it too much overhead? The reason is I'd
>> How do you use it to make a background traffic if you change route on
>> every loop iteration?
>>> like to get rid of all ugly scripts and binaries in
>>> testcases/network/stress/ns-tools, including ns-udpsender.c.
>> ns-udpsender can send a single UDP datagram over the new route without
>> waiting for answer but unfortunately we don't know for sure whether it
>> actually sent datagram and/or destination received it.
> What would you suggest? I chose netstress as it's kind of client & server application. Do
> we want to write something from scratch?
> I don't like also the infinite loop in send_udp_datagram (I've caused one crash in local
> network in previous tests by sending too many packets).

I would convert to match the previous version for now, e.g.route-change-dst.

do_test()
{
        local new_rtaddrcnt
        local if=$(tst_iface)
        local inet="inet$TST_IPV6"

        tst_resm TINFO "change IPv$ipver route $NS_TIMES times"

        local udp_size=1472
        local mask=24
        if [ "$TST_IPV6" ]; then
            udp_size=1452
            mask=64
        fi

        cnt=1
        while [ $cnt -le $NS_TIMES ]; do

            new_rt="$(tst_ipaddr_un $cnt)/$mask"
            addr="$(tst_ipaddr_un $cnt 1)"
           
            ROD ip route add $new_rt dev $if
            ROD ip ne replace $addr lladdr $(tst_hwaddr rhost) nud
permanent dev $if

            # Load the route with one UDP datagram
            ROD ns-udpsender -f $ipver -D $addr -p $cnt -o -s $udp_size

            ROD ip neigh del $addr lladdr $(tst_hwaddr rhost)dev $if
            ROD ip route del $new_rt dev $if

            cnt=$(($cnt + 1))
        done

        tst_resm TPASS "Test is finished correctly"
}

For background traffic it's better to have 'netstress' running.

Thanks,
Alexey