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Date: Sun, 17 Jun 2018 14:55:06 +0530
Cc: yongwang@vmware.com
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Subject: [dpdk-dev] vmxnet3 TX TCP/UDP checksum not getting computed with
	L2_len > 14
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Hello,

Issue observed when using vmxnet3 based interface on packet with =
following structure is sent:

Ethernet + PPPoE + PPP (22 bytes) as the Layer 2 header,=20
IPv4 (20)=20
UDP
DNS Payload

The tx offload value in this case is 0x0f0000000000000 (PKT_TX_IPV4  | =
PKT_TX_IP_CKSUM | PKT_TX_UDP_CKSUM)

The checksum of the packet seen by the receiver shows incorrect checksum =
and it=E2=80=99s value is the pseudo checksum value that was set at the =
time of the TX. However the IP header checksum is correct.

The same issue is not seen when the L2 header is a just the Ethernet (14 =
bytes).

Also, with the same setup on the same hardware if we switch the driver =
from vmxnet3 to e1000e, all checksums are computed correctly.

Is this a DPDK vmxnet3 driver bug or that of underlying esxi? The ESXi =
version is 6.0.0 (Build 3620759).

Thanks,
Padam=