Problem with receiving packets right after remote-interface is up

[Luigi Rizzo]

You may be able to avoid the issue if you avoid autonegotiation and
manually set the media type, speed and duplex.

Cheers
Luigi

On Saturday, September 5, 2015, M. V. via freebsd-net <
freebsd-net at freebsd.org> wrote:

> Hi,
>
> Our product is being tested with Spirent TestCenter, and we're facing an
> unusual problem with the tests.
> We use NICs with intel 82574 and 82576 on FreeBSD 9.2 with latest em and
> igb drivers (we also tested this on FreeBSD-10.1) It seems what Spirent
> TestCenter does to start any individual test is, it disables its own
> interface, and at the beginning of the new test, it suddenly "up"s its
> interface and sends test packet right after that without any delay. This is
> where we have problem, and we don't receive this first packets most of the
> time (result is vary, in 100 tests, we lose about 60~70% of this "first"
> packets on each test, so we FAIL most of tests because apparently we need
> about 0.5~1 seconds after setup and renegotiation before we can receive
> packets)
> we checked both em and igb drivers and both have this problem.
> this is how we reproduce the problem:
> - connect sender-system's first port to receiver-system's first port.
> - In sender-system:
> -- ifconfig em0 down
> -- sleep 5
> -- ifconfig em0 up && tcpreplay -l 1 -i em0 one_packet.pcap
>
> We checked, and even though sender sends packet successfully (tx led
> blinks), in receiver even driver doesn't receive it (rx led doesn't blink,
> and "rxeof" function in "if_em" tells us no new packet is received)
> we removed optional interface options like msix, tso, rxcsum, ... but no
> luck.
>
> So, does anyone know any solution for this problem? or any suggestions on
> where we should look or what we should do that might solve it and prevent
> our tests from being failed?
>
> Thank you guys.
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-- 
-----------------------------------------+-------------------------------
 Prof. Luigi RIZZO, rizzo at iet.unipi.it  . Dip. di Ing. dell'Informazione
 http://www.iet.unipi.it/~luigi/        . Universita` di Pisa
 TEL      +39-050-2217533               . via Diotisalvi 2
 Mobile   +39-338-6809875               . 56122 PISA (Italy)
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