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

[Wiles, Keith]

> On Nov 19, 2019, at 11:42 AM, Roberts, Lee A. <lee.roberts at hpe.com> wrote:
> 
> 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

I have a updated pktgen with jumbo support. You need to pass the -j option to get jumbo frame support in pktgen. I have not done a lot of testing on this version. If you have time please pull the pktgen repo and switch over to the ‘dev’ branch and see if this work for you. I did not use your changes here and did it my way :-)

I did not change DPDK, as it seemed like it did not matter if RTE_MBUF_DEFAULT_DATAROOM changed. I am sure someplace may care if they used that define.

> 
> 
> -----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

Regards,
Keith