l2fwd does not send packets

l2fwd does not send packets

[Xin Li]

Hi,

The l2fwd sample application in my environment does not send packets
through the TX port. I run DPDK inside a KVM guest. The NIC ports are VFs
assigned to the VM by pci passthrough.

Environment:

Host OS: ubuntu 14.04 x86_64
NIC: intel x540-t1
Guest OS: ubuntu 14.04 x86_64
DPDK: v1.7.0

Some findings:

1. l2fwd reports 511 packets sent when max tx descriptor is 512, The number
changes to 1023 if the max tx descriptor is set to 1024.

2. On the receiver side, no packet captured.

Anyone know the issue and the corresponding fix? Thanks.

Best,
Xin

Re: l2fwd does not send packets

[Richardson, Bruce]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Xin Li
> Sent: Wednesday, September 10, 2014 10:19 PM
> To: dev
> Subject: [dpdk-dev] l2fwd does not send packets
> 
> Hi,
> 
> The l2fwd sample application in my environment does not send packets
> through the TX port. I run DPDK inside a KVM guest. The NIC ports are VFs
> assigned to the VM by pci passthrough.
> 
> Environment:
> 
> Host OS: ubuntu 14.04 x86_64
> NIC: intel x540-t1
> Guest OS: ubuntu 14.04 x86_64
> DPDK: v1.7.0
> 
> Some findings:
> 
> 1. l2fwd reports 511 packets sent when max tx descriptor is 512, The number
> changes to 1023 if the max tx descriptor is set to 1024.
> 
> 2. On the receiver side, no packet captured.
> 
> Anyone know the issue and the corresponding fix? Thanks.
> 

One thing that is worth checking is that the source mac address of the packets being sent matches that of the VF interface, as the packets can't be sent otherwise.

/Bruce

Re: l2fwd does not send packets

[Yerden Zhumabekov]

Hi,

To make l2fwd act like a L2 bridge, I had altered l2fwd_simple_forward()
function:

static void
l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
{
    unsigned dst_port;
    dst_port = l2fwd_dst_ports[portid];
    l2fwd_send_packet(m, (uint8_t) dst_port);
}

11.09.2014 3:18, Xin Li пишет:
> Hi,
>
> The l2fwd sample application in my environment does not send packets
> through the TX port. I run DPDK inside a KVM guest. The NIC ports are VFs
> assigned to the VM by pci passthrough.
>
> Environment:
>
> Host OS: ubuntu 14.04 x86_64
> NIC: intel x540-t1
> Guest OS: ubuntu 14.04 x86_64
> DPDK: v1.7.0
>
> Some findings:
>
> 1. l2fwd reports 511 packets sent when max tx descriptor is 512, The number
> changes to 1023 if the max tx descriptor is set to 1024.
>
> 2. On the receiver side, no packet captured.
>
> Anyone know the issue and the corresponding fix? Thanks.
>
> Best,
> Xin

-- 
Sincerely,

Yerden Zhumabekov
State Technical Service
Astana, KZ