[dpdk-dev] No egressing packet

[dpdk-dev] No egressing packet

[Wu, Yiwen]

Hi all,

I am new to dpdk. I am running a single forwarding program based on dpdk 
2.1.0. The program runs on a VM, binding on two interfaces. All it's 
doing is to forward packets from one interface to another. All 
ingressing packets are fine but there seems no egressing packets. I used 
rte_eth_add_tx_callback to register a tx callback. The callback is able 
to print the right egress packet but the destination is just not 
receiving it (via tcpdump). Does anybody have the similar experience? 
Any solution or hints will be great.

Thanks,

Yiwen

Re: [dpdk-dev] No egressing packet

[Thomas Monjalon]

2015-09-15 17:10, Wu, Yiwen:
> Hi all,
> 
> I am new to dpdk. I am running a single forwarding program based on dpdk 
> 2.1.0. The program runs on a VM, binding on two interfaces. All it's 
> doing is to forward packets from one interface to another. All 
> ingressing packets are fine but there seems no egressing packets. I used 
> rte_eth_add_tx_callback to register a tx callback. The callback is able 
> to print the right egress packet but the destination is just not 
> receiving it (via tcpdump). Does anybody have the similar experience? 
> Any solution or hints will be great.

You need to call rte_eth_tx_burst() instead of rte_eth_add_tx_callback().
For more information, please check the guide:
	http://dpdk.org/doc/guides/prog_guide/poll_mode_drv.html#poll-mode-driver
You can also check this basic example:
	http://dpdk.org/browse/dpdk/tree/examples/skeleton/basicfwd.c

Re: [dpdk-dev] No egressing packet

[Wu, Yiwen]

Thomas,

I am using rte_eth_tx_burst to send packets. I also use 
rte_eth_add_tx_callback to register a callback to figure out what has 
been sent.

Thanks,

Yiwen

On 9/16/2015 3:32 AM, Thomas Monjalon wrote:
> 2015-09-15 17:10, Wu, Yiwen:
>> Hi all,
>>
>> I am new to dpdk. I am running a single forwarding program based on dpdk
>> 2.1.0. The program runs on a VM, binding on two interfaces. All it's
>> doing is to forward packets from one interface to another. All
>> ingressing packets are fine but there seems no egressing packets. I used
>> rte_eth_add_tx_callback to register a tx callback. The callback is able
>> to print the right egress packet but the destination is just not
>> receiving it (via tcpdump). Does anybody have the similar experience?
>> Any solution or hints will be great.
> You need to call rte_eth_tx_burst() instead of rte_eth_add_tx_callback().
> For more information, please check the guide:
> 	http://dpdk.org/doc/guides/prog_guide/poll_mode_drv.html#poll-mode-driver
> You can also check this basic example:
> 	http://dpdk.org/browse/dpdk/tree/examples/skeleton/basicfwd.c

Re: [dpdk-dev] No egressing packet

[Richardson, Bruce]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Wu, Yiwen
> Sent: Wednesday, September 16, 2015 2:31 PM
> To: Thomas Monjalon
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] No egressing packet
> 
> Thomas,
> 
> I am using rte_eth_tx_burst to send packets. I also use
> rte_eth_add_tx_callback to register a callback to figure out what has been
> sent.
> 

I would suggest checking that the source mac address is correct for all
outgoing frames as packets with an incorrect source are likely to be blocked
due to security (spoofing) concerns.

/Bruce

> Thanks,
> 
> Yiwen
> 
> On 9/16/2015 3:32 AM, Thomas Monjalon wrote:
> > 2015-09-15 17:10, Wu, Yiwen:
> >> Hi all,
> >>
> >> I am new to dpdk. I am running a single forwarding program based on
> >> dpdk 2.1.0. The program runs on a VM, binding on two interfaces. All
> >> it's doing is to forward packets from one interface to another. All
> >> ingressing packets are fine but there seems no egressing packets. I
> >> used rte_eth_add_tx_callback to register a tx callback. The callback
> >> is able to print the right egress packet but the destination is just
> >> not receiving it (via tcpdump). Does anybody have the similar
> experience?
> >> Any solution or hints will be great.
> > You need to call rte_eth_tx_burst() instead of
> rte_eth_add_tx_callback().
> > For more information, please check the guide:
> >
> > http://dpdk.org/doc/guides/prog_guide/poll_mode_drv.html#poll-mode-dri
> > ver You can also check this basic example:
> > 	http://dpdk.org/browse/dpdk/tree/examples/skeleton/basicfwd.c