Hello,

Thanks for the help.
As I'm using DPDK-18.11.1, I did not find the definition of
"RTE_ETHER_MAX_LEN" in lib/librte_net/rte_ether.h file.
So I set "ETHER_MAX_LEN" value to 9600.
Apart from that I took rest of the changes and with these I'm able to send
jumbo frame.
Took tcpdump on the receiving end.

Suddenly I got stuck at ARP. I could not send packets anymore.

I've attached success & failure scenario.

Regards,
N. Sarkar

On Wed, Nov 20, 2019 at 2:14 AM Morten Brørup <mb@smartsharesystems.com>
wrote:

> 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@dpdk.org] On Behalf Of Roberts, Lee A.
> > Sent: Tuesday, November 19, 2019 6:42 PM
> > To: Nirmal Sarkar; dev@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@dpdk.org] On Behalf Of Nirmal Sarkar
> > Sent: Monday, November 18, 2019 10:26 AM
> > To: dev@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
>