[dpdk-dev] Jumbo Frame in pktgen & dpdk-pktgen

[Morten Brørup]

John, Marko,

It seems we are missing documentation about enabling Jumbo frames in an application, and possibly an example of using the rte_eth_dev_info->max_mtu.


Med venlig hilsen / kind regards
- Morten Brørup

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Roberts, Lee A.
> Sent: Tuesday, November 19, 2019 6:42 PM
> To: Nirmal Sarkar; dev at dpdk.org
> Subject: Re: [dpdk-dev] Jumbo Frame in pktgen & dpdk-pktgen
> 
> Nirmal,
> 
> Here are the changes that I've been using to allow jumbo frames with dpdk-
> 19.08 and
> pktgen-19.10.0:
> 
> diff -r default/dpdk-19.08/lib/librte_mbuf/rte_mbuf.h jumbo/dpdk-
> 19.08/lib/librte_mbuf/rte_mbuf.h
> 462c462
> < #define	RTE_MBUF_DEFAULT_DATAROOM	2048
> ---
> > #define	RTE_MBUF_DEFAULT_DATAROOM	9600
> diff -r default/dpdk-19.08/lib/librte_net/rte_ether.h jumbo/dpdk-
> 19.08/lib/librte_net/rte_ether.h
> 33c33
> < #define RTE_ETHER_MAX_LEN   1518  /**< Maximum frame len, including CRC.
> */
> ---
> > #define RTE_ETHER_MAX_LEN   9600  /**< Maximum frame len, including CRC.
> */
> diff -r default/pktgen-19.10.0/app/pktgen.c jumbo/pktgen-
> 19.10.0/app/pktgen.c
> 749c749
> < 	else if ( (plen >= 1024) && (plen <= PG_ETHER_MAX_LEN))
> ---
> > 	else if ( (plen >= 1024) && (plen <= 1518))
> 753c753
> < 	else if (plen > PG_ETHER_MAX_LEN)
> ---
> > 	else if (plen > 1518)
> diff -r default/pktgen-19.10.0/lib/common/pg_inet.h jumbo/pktgen-
> 19.10.0/lib/common/pg_inet.h
> 379,380c379,380
> < #define ETH_MTU                     1500	/* Max MTU for Ethernet */
> < #define ETH_MAX_PKT                 1518	/* Max Ethernet frame size */
> ---
> > #define ETH_MTU                     9600	/* Max MTU for Ethernet */
> > #define ETH_MAX_PKT                 9600	/* Max Ethernet frame size */
> 
>                                    - Lee Roberts
> 
> 
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Nirmal Sarkar
> Sent: Monday, November 18, 2019 10:26 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] Jumbo Frame in pktgen & dpdk-pktgen
> 
> Hello,
> 
> I'm trying to explore pktgen and dpdk-pktgen with Jumbo frame.
> 
> I'm using ubuntu-18.04 system where pktgen is a kernel module and I don't
> have any provision to set it for Jumbo frame.
> Can you please suggest how to configure Jumbo frame in pktgen ?
> 
> In dpdk source code, I've modified RTE_MBUF_DEFAULT_DATAROOM [
> *lib/librte_mbuf/rte_mbuf.h*] value with 9K and built.
> During testing, I could not send packet size more than 1500 byte.
> What is the suggestion to overcome this problem ?
> 
> Regards,
> N. Sarkar