Re: [dpdk-users] DPDK-PKTGEN crashes when using Jumbo frame in AWS EC2

[Anand Gupta <anand.gupta@keysight.com>]

Hi Keith,

Thanks for the reply.

Can you explain if possible what does "DEV_TX_OFFLOAD_MULTI_SEGS" do if it is used in TX-Offload ? What is the use of this in Jumbo frame scenario?

Thanks,
Anand

From: Wiles, Keith <keith.wiles@intel.com>
Sent: Wednesday, May 5, 2021 6:19 PM
To: Anand Gupta <anand.gupta@keysight.com>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] DPDK-PKTGEN crashes when using Jumbo frame in AWS EC2

We can try to test for Multi-segs in pktgen in the file app/pktgen-port-cfg.c you can search for MULTI_SEGS and add the test.

                        if (info->dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MULTI_SEGS)
                                conf.txmode.offloads |= DEV_TX_OFFLOAD_MULTI_SEGS;

From: Anand Gupta <anand.gupta@keysight.com<mailto:anand.gupta@keysight.com>>
Date: Wednesday, May 5, 2021 at 6:54 AM
To: Wiles, Keith <keith.wiles@intel.com<mailto:keith.wiles@intel.com>>
Cc: users@dpdk.org<mailto:users@dpdk.org> <users@dpdk.org<mailto:users@dpdk.org>>
Subject: RE: [dpdk-users] DPDK-PKTGEN crashes when using Jumbo frame in AWS EC2
Hi Keith,

I found the root cause for the problem " requested Tx offloads 0x8000 doesn't match Tx offloads capabilities 0xe" in EC2 instances.
The DPDK ENA driver does not have "DEV_TX_OFFLOAD_MULTI_SEGS" TX offload capability in TX offloads capabilities and in Pktgen when Jumbo frame is enabled, the TX-offload adds " DEV_TX_OFFLOAD_MULTI_SEGS".

Is "DEV_TX_OFFLOAD_MULTI_SEGS" necessary when the Jumbo frame is enable in the Pktgen or can we first check if the Device supports the offload or not and then add " DEV_TX_OFFLOAD_MULTI_SEGS"?

What is the mechanism of "DEV_TX_OFFLOAD_MULTI_SEGS" when enabling Jumbo frames?

Thanks,
Anand
-----Original Message-----
From: Wiles, Keith <keith.wiles@intel.com<mailto:keith.wiles@intel.com>>
Sent: Friday, February 12, 2021 7:26 PM
To: Anand Gupta <anand.gupta@keysight.com<mailto:anand.gupta@keysight.com>>
Cc: users@dpdk.org<mailto:users@dpdk.org>
Subject: Re: [dpdk-users] DPDK-PKTGEN crashes when using Jumbo frame in AWS EC2

CAUTION: This message originates from an external sender.

> On Feb 11, 2021, at 11:03 PM, Anand Gupta <anand.gupta@keysight.com<mailto:anand.gupta@keysight.com>> wrote:
>
> Hello All,
>
> I'm trying to run DPDK-PKTGEN in AWS EC2 instances and able to send packets up to 1.5 KB packets.
> If we use Jumbo frame packets then we are getting error "requested Tx offloads 0x8000 doesn't match Tx offloads capabilities 0xe".
>
> Setup:
> Ubuntu: 16.04
> Driver: ENA 2.0.3K
> DPDK: 18.11.1
> PKTGEN: 3.7.1

Please update to the latest Pktgen 21.02.0 with the latest DPDK version. If you can not upgrade then please look at the latest version as some work for jumbo frames was done a few months ago.
>
> Can anyone help me with this issue ? Is anything I'm missing ?
>
> Thanks,
> Anand