[dpdk-users] Setup pktgen as a receiver

[dpdk-users] Setup pktgen as a receiver

[Dan Brown]

I'm trying to run 2 pktgen instances, on two separate VMs, one act as a
generator and the other act as the a receiver.

TX is OK,  but for some reason the intended RX pktgen seem to receive no
packets (RX counters are zero).

With no pktgen/dpdk, both RX and TX interfaces can communicate properly (so
no network infrastructure level issue I suppose).

The cmd I use to init both ends is:
'./app/x86_64-native-linuxapp-gcc/pktgen -c 0x7 -n 1 -- -T -P -m "[1:2].0"'

Then 'start 0' on the TX instance.

Is there anything else I should execute on the RX instance for it to start
receiving packets?

Some more infrastructure details:
- Both interface are Intel SR-IOV VFs
- Hypervisor is VMware ESXi 6.5
- SR-IOV vSwitches are configured to allow promiscuous mode.
- Ubuntu 16.04 Guest OSs
- DPDK 18.02, pktgen 3.4.9

Re: [dpdk-users] Setup pktgen as a receiver

[James Bensley]

On 12 April 2018 at 13:32, Dan Brown <dan.brown.vzw@gmail.com> wrote:
> I'm trying to run 2 pktgen instances, on two separate VMs, one act as a
> generator and the other act as the a receiver.
>
> TX is OK,  but for some reason the intended RX pktgen seem to receive no
> packets (RX counters are zero).
>
> With no pktgen/dpdk, both RX and TX interfaces can communicate properly (so
> no network infrastructure level issue I suppose).
>
> The cmd I use to init both ends is:
> './app/x86_64-native-linuxapp-gcc/pktgen -c 0x7 -n 1 -- -T -P -m "[1:2].0"'
>
> Then 'start 0' on the TX instance.
>
> Is there anything else I should execute on the RX instance for it to start
> receiving packets?
>
> Some more infrastructure details:
> - Both interface are Intel SR-IOV VFs
> - Hypervisor is VMware ESXi 6.5
> - SR-IOV vSwitches are configured to allow promiscuous mode.
> - Ubuntu 16.04 Guest OSs
> - DPDK 18.02, pktgen 3.4.9

Hi Dan,

Are these two devices in the same layer 2 broadcast domain / layer 3
subnet as each other? When I use two devices in different subnets I
have to first send some gratuitous ARP frames so that the gateway can
find the two Pktgen hosts:

set 0 src ip 10.0.1.1/30  # Gateway device is 10.0.1.2
set 0 dst ip 10.0.2.1
set 0 dst mac a8:0c:0d:7b:f6:e5  # MAC of gateway device

set 1 src ip 10.0.2.1/30  # Gateway device is 10.0.2.2
set 1 dst ip 10.0.1.1
set 1 dst mac a8:0c:0d:7b:f6:e4  # MAC of gateway device

start 0,1 arp gratuitous
start 0,1 arp gratuitous

start 0


Cheers,
James.

Re: [dpdk-users] Setup pktgen as a receiver

[Dan Brown]

Thanks James. That indeed solved the problem.

On Thu, Apr 12, 2018 at 4:59 PM, James Bensley <jwbensley@gmail.com> wrote:

> On 12 April 2018 at 13:32, Dan Brown <dan.brown.vzw@gmail.com> wrote:
> > I'm trying to run 2 pktgen instances, on two separate VMs, one act as a
> > generator and the other act as the a receiver.
> >
> > TX is OK,  but for some reason the intended RX pktgen seem to receive no
> > packets (RX counters are zero).
> >
> > With no pktgen/dpdk, both RX and TX interfaces can communicate properly
> (so
> > no network infrastructure level issue I suppose).
> >
> > The cmd I use to init both ends is:
> > './app/x86_64-native-linuxapp-gcc/pktgen -c 0x7 -n 1 -- -T -P -m
> "[1:2].0"'
> >
> > Then 'start 0' on the TX instance.
> >
> > Is there anything else I should execute on the RX instance for it to
> start
> > receiving packets?
> >
> > Some more infrastructure details:
> > - Both interface are Intel SR-IOV VFs
> > - Hypervisor is VMware ESXi 6.5
> > - SR-IOV vSwitches are configured to allow promiscuous mode.
> > - Ubuntu 16.04 Guest OSs
> > - DPDK 18.02, pktgen 3.4.9
>
> Hi Dan,
>
> Are these two devices in the same layer 2 broadcast domain / layer 3
> subnet as each other? When I use two devices in different subnets I
> have to first send some gratuitous ARP frames so that the gateway can
> find the two Pktgen hosts:
>
> set 0 src ip 10.0.1.1/30  # Gateway device is 10.0.1.2
> set 0 dst ip 10.0.2.1
> set 0 dst mac a8:0c:0d:7b:f6:e5  # MAC of gateway device
>
> set 1 src ip 10.0.2.1/30  # Gateway device is 10.0.2.2
> set 1 dst ip 10.0.1.1
> set 1 dst mac a8:0c:0d:7b:f6:e4  # MAC of gateway device
>
> start 0,1 arp gratuitous
> start 0,1 arp gratuitous
>
> start 0
>
>
> Cheers,
> James.
>