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From: chetan bhasin <chetan.bhasin017@gmail.com>
Date: Wed, 11 Mar 2020 17:06:07 +0530
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Subject: [dpdk-dev] Regarding ENIC driver dpdk 17.11.4 vs dpdk 19.05
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Hi,

We are using VPP , which internally using dpdk.

*With vpp 18.01(dpdk 17.11.4)* : Whenever we set MTU of interface as 1500 ,
we can get 1500 size of untagged and tagged packet.

*With vpp 19.0.5* (dpdk 19.05) : Whenever we set mtu as 1500 , we have seen
issue with vlan packets, those are not even enter dpdk-input node of vpp.

As per code

difference which is leading to the above issue

   1.

   Dpdk 17.11.4 (device_info->max_rx_pktlen = enic->max_mtu + ETHER_HDR_LEN
   + 4)
   2.

   Dpdk 19.05  (enic->max_mtu + ETHER_HDR_LEN;) --------> *+ 4 is not there*


So why we have changed this logic in later dpdk version?

Thanks,
Chetan