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

[Nirmal Sarkar <nirmal.kisan@gmail.com>]

Hi Keith,

I've taken all the changes [in pktgen-3.7.1] you made to support Jumbo
Frame.

I'm sending packet of 9000 bytes from the sender. [sending screenshot
attached].

In the receiver side:
(1) started testpmd:
[ testpmd -c 0x0f -n 2 -b 03:00.0 -- -i --rxd=1024 --txd=1024 --burst=144
--txpt=32 --txht=0 --txfreet=0 --rxfreet=64 --mbcache=200 --portmask=0x3
--mbuf-size=2048 --max-pkt-len=9600 ]
Now if I do a "show port stats 0", I see "RX-missed" is getting increased
where as "RX-bytes" is stuck into a fixed value.

  ######################## NIC statistics for port 0
########################
  RX-packets: 259        RX-missed: 35728      RX-bytes:  2294220
  RX-errors: 0
  RX-nombuf:  0
  TX-packets: 0          TX-errors: 0          TX-bytes:  0

  Throughput (since last show)
  Rx-pps:            0
  Tx-pps:            0

############################################################################

  ######################## NIC statistics for port 0
########################
  RX-packets: 259        RX-missed: 71272      RX-bytes:  2294220
  RX-errors: 0
  RX-nombuf:  0
  TX-packets: 0          TX-errors: 0          TX-bytes:  0

  Throughput (since last show)
  Rx-pps:            0
  Tx-pps:            0

############################################################################

(2) started pktgen with "-j" option:
  (i) "MBits/s Rx" is not more than 384 when I send 9K packet, but this
value increases to 985~1007 if I send 1K packet.
  (ii) "Pkt Size" is showing 64
  (iii) I'm seeing only Packet of size 5K is getting received when I send
9K packet.[ Please check the attached receive.jpg]

From the above observation in the receiver side, there may be some issue in
receiving Jumbo frames.

I would also like to mention *Fragmentation* is not required in the
send/recv.

Regards,
N. Sarkar

On Mon, Dec 2, 2019 at 1:25 AM Nirmal Sarkar <nirmal.kisan@gmail.com> wrote:

> Hello Keith,
>
> Thanks a lot for your help.
> I'm using pktgen-3.7.1. So I'll pull your changes there and check it.
>
> Regards,
> N. Sarkar
>
> On Sat, Nov 30, 2019 at 5:31 AM Wiles, Keith <keith.wiles@intel.com>
> wrote:
>
>>
>>
>> > On Nov 19, 2019, at 11:42 AM, Roberts, Lee A. <lee.roberts@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@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
>>
>> Regards,
>> Keith
>>
>>