Re: [dpdk-dev] Client Server Application using DPDK API

[Vivek Gupta <vivek-g@hcl.com>]

Hi

I am developing a network program using DPDK API. I want to extract the data which is there is rte_mbuf structure.

Referred to rte_mbuf structure manual but confused with fields 

uint16_t buf_len;         /**< Length of segment buffer. */
uint16_t data_len;        /**< Amount of data in segment buffer. */


Can someone help me to understand how to extract data from buffer?

Thanks & regards
Vivek Gupta

-----Original Message-----
From: Remy Horton [mailto:remy.horton@intel.com] 
Sent: Wednesday, March 09, 2016 10:14 PM
To: Vivek Gupta
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] Client Server Application using DPDK API

'noon,

On 09/03/2016 08:45, Vivek Gupta wrote:
> Hi
>
> I want to write a Client Server application using DPDK API on a single 
> machine. What are the basic building block for that. How can we write 
> such application?

examples/l2fwd/main.c and examples/ethtool/ethtool-app/main.c are probably the easier examples to follow. In terms of function calls, it is pretty much:

rte_eal_init(..);
for (each port) {
	rte_pktmbuf_pool_create(..);
	rte_eth_dev_configure(..);
	rte_eth_dev_rx_queue_setup(..);
	rte_eth_dev_tx_queue_setup(..);
	rte_eth_dev_start(..);
}
while(1) {
	rte_eth_rx_burst(..); /* incoming frames */
	rte_eth_tx_burst(..); /* outgoing frames */ }

Bear in mind that DPDK deals with MAC frames rather than higher level IP packets, which may be an issue if you intend to use TCP/IP based application protocols.


> ::DISCLAIMER::

Avoid using confidentality disclaimers on mailing list emails. It tends to "annoy" people.. :)

Regards,

..Remy


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