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

[Wiles, Keith]

> On Nov 20, 2019, at 6:09 AM, Nirmal Sarkar <nirmal.kisan at gmail.com> wrote:
> 
> 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.

Sorry, I can not tell what the error condition is you are hitting, as the two screen dumps do not provide me where I should start looking. If you can help me understand the issue better.
> 
> I've attached success & failure scenario.
> 
> Regards,
> N. Sarkar
> 
> On Wed, Nov 20, 2019 at 2:14 AM Morten Brørup <mb at 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 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
>> 
> <success.txt><failure.txt>

Regards,
Keith