[dpdk-users] Packet drop when using KNI sample application

[Amit Sharma]

Hi Andiry,

We already changed the vEth0 mac address [same as eth0 mac address].

For reproducing the issue, please follow below mention steps:-
1. Assign the ip address to vEth0.
2. take the port down [*ifconfig vEth0 down*]
3. up the port [*ifconfig vEth0 up*]
4. wait for 400-500 ping Packet, issue is going to reproduce.

PS:- when we do port down and up, once port is up. Issue will occur.

Br
Amit Sharma

On Thu, Sep 22, 2016 at 1:37 PM, Andriy Berestovskyy <aber at semihalf.com>
wrote:

> Hey Amit,
> Regarding the pings. Try to set the same MAC on vEth as you have on
> eth0 prior the unbind, i.e.:
>
> # ifconfig vEth hw ether <eth0 MAC>
>
>
> Regarding the logs. There are compile-time options to enable debugs in
> PMDs. Please see config/common_base file for the complete list.
>
> Not sure which driver you use, but for virtio-net you could try to
> enable *_VIRTIO_DEBUG_RX/TX and then recompile the DPDK and the KNI
> example.
>
> Regards,
> Andriy
>
> On Mon, Sep 19, 2016 at 9:59 AM, Amit Sharma <amit.sh1094 at gmail.com>
> wrote:
> > Hi,
> >
> > While running the DPDK KNI sample application, we are facing packet drop
> > after some time.
> >
> > *Setup:-*
> > 1. 2 VMs configured using Ubuntu 14.04
> > 2. eth0 of both VMs connected to each other, and able to ping
> >
> > *DPDK related setup:-*
> > 1. 1st VM eth0 is bound with DPDK driver[bind=uio_pci_generic]
> > 2. Insert the KNI module in Linux kernel[insmod rte_kni.ko].
> > 3. Start the KNI application [*./build/kni -c 0x3 -n 4 -- -P -p 0x1
> > --config="(0,0,1)"*].
> > 4. Assign the ip address to vEth0 [*ifconfig vEth0 10.0.1.2*]
> > 5. start the tcpdump on vEth0
> > 6. From 2nd VM try to ping 8.8.8.8
> >
> > *Issue:- *
> > ping works fine for around 400-500 packets(we reserved 2000 2MB
> hugepages).
> > after that ping packet is never sent back to VM2
> > on further investigation we found *rte_eth_tx_burst *always returns 0
> when
> > the problem occurs
> > we are investigating it further, But before that any help is welcome
> >
> >
> > on the side note, we have another issue with log levels, to investigate
> the
> > above issue we were trying to enable the logs for PMD
> > using the following code
> >
> > rte_set_log_type(RTE_LOGTYPE_PMD, 1);
> >
> > rte_set_log_level(RTE_LOG_DEBUG);
> >
> > during initialization we see some logs from PMD, But after that no logs
> > during receive and transmission of packets, any idea why is that?
> >
> > Thanks
> > Amit Sharma
>
>
>
> --
> Andriy Berestovskyy
>