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From: =?UTF-8?B?5a6L5o23?= <songj@zctt.com>
To: "'Stephen Hemminger'" <stephen@networkplumber.org>
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Subject: [dpdk-users] =?utf-8?b?562U5aSNOiAgSG93IHRvIG1ha2UgdmlydHVhbCBO?=
	=?utf-8?q?IC_=28virtio_and_vmxnet3=29_support_IP_header_checksum?=
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Thanks,=20

I run testpmd for checking tx_offload capabilities, Virtio do not =
support IP checksum.

vmxnet3 can't start by testpmd, I need send another email about this.

Thanks
Jie

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Stephen Hemminger =
[mailto:stephen@networkplumber.org]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B42=E6=9C=8826=E6=97=A5 =
23:48
=E6=94=B6=E4=BB=B6=E4=BA=BA: =E5=AE=8B=E6=8D=B7 <songj@zctt.com>
=E6=8A=84=E9=80=81: 'users' <users@dpdk.org>
=E4=B8=BB=E9=A2=98: Re: [dpdk-users] How to make virtual NIC (virtio and =
vmxnet3) support IP header checksum?

On Tue, 26 Feb 2019 16:29:00 +0800
=E5=AE=8B=E6=8D=B7 <songj@zctt.com> wrote:

> Hi All
>=20
>     I test the DPDK virtual nics both in Esxi and KVM, I used DPDK =20
> vmxnet3, virtio and e1000 nic. I need create IP packets and TX them.
>=20
> =20
>=20
> I set the rte_mbuf as below before TX.
>=20
> mb->l2_len =3D len(out_eth)
>=20
> mb->l3_len =3D len(out_ip)
>=20
> mb->ol_flags |=3D PKT_TX_IPV4 | PKT_TX_IP_CSUM
>=20
> =20
>=20
> It worked well with DPDK virtual e1000 nic, the IP header checksum=20
> will be set correct value. but vmxnet3 and virtio just keep 0 for IP=20
> header checksum.
>=20
> I disable above code and call rte_ipv4_cksum for each IP header=20
> checksum. it worked with vmxnet3 and virtio when TX slowly, but=20
> checksum invalid once TX quicklyL
>=20
> =20
>=20
> Why the DPDK vmxnet3 and virtio drivers don't support IP checksum?
>=20
> If there=E2=80=99s an easy way for adding the IP header checksum with =
vmxnet3=20
> and virtio ?
>=20
> =20
>=20
> =20
>=20
> Thanks
>=20
> =20
>=20
> Jie
>=20

You need to look at the TX_OFFLOAD capability flags in dev_info.
Many drivers do not support IP checksum offload.