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Subject: [dpdk-users] How to make virtual NIC (virtio and vmxnet3) support
	IP header checksum?
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Hi All

    I test the DPDK virtual nics both in Esxi and KVM, I used DPDK  =
vmxnet3,
virtio and e1000 nic. I need create IP packets and TX them.

=20

I set the rte_mbuf as below before TX.

mb->l2_len =3D len(out_eth)

mb->l3_len =3D len(out_ip)

mb->ol_flags |=3D PKT_TX_IPV4 | PKT_TX_IP_CSUM

=20

It worked well with DPDK virtual e1000 nic, the IP header checksum will =
be
set correct value. but vmxnet3 and virtio just keep 0 for IP header
checksum.=20

I disable above code and call rte_ipv4_cksum for each IP header =
checksum. it
worked with vmxnet3 and virtio when TX slowly, but checksum invalid once =
TX
quicklyL

=20

Why the DPDK vmxnet3 and virtio drivers don't support IP checksum?

If there=A1=AFs an easy way for adding the IP header checksum with =
vmxnet3 and
virtio ?

=20

=20

Thanks

=20

Jie