From: Stephen Hemminger <stephen@networkplumber.org>
To: 宋捷 <songj@zctt.com>
Cc: "'users'" <users@dpdk.org>
Subject: Re: [dpdk-users] How to make virtual NIC (virtio and vmxnet3) support IP header checksum?
Date: Tue, 26 Feb 2019 07:48:15 -0800 [thread overview]
Message-ID: <20190226074815.6203533d@shemminger-XPS-13-9360> (raw)
In-Reply-To: <5c74f8e3.1c69fb81.b9311.cde6SMTPIN_ADDED_BROKEN@mx.google.com>
On Tue, 26 Feb 2019 16:29:00 +0800
宋捷 <songj@zctt.com> wrote:
> 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.
>
>
>
> I set the rte_mbuf as below before TX.
>
> mb->l2_len = len(out_eth)
>
> mb->l3_len = len(out_ip)
>
> mb->ol_flags |= PKT_TX_IPV4 | PKT_TX_IP_CSUM
>
>
>
> 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.
>
> 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
>
>
>
> Why the DPDK vmxnet3 and virtio drivers don't support IP checksum?
>
> If there’s an easy way for adding the IP header checksum with vmxnet3 and
> virtio ?
>
>
>
>
>
> Thanks
>
>
>
> Jie
>
You need to look at the TX_OFFLOAD capability flags in dev_info.
Many drivers do not support IP checksum offload.
next parent reply other threads:[~2019-02-26 15:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5c74f8e3.1c69fb81.b9311.cde6SMTPIN_ADDED_BROKEN@mx.google.com>
2019-02-26 15:48 ` Stephen Hemminger [this message]
2019-02-27 2:40 ` [dpdk-users] 答复: " 宋捷
2019-02-26 8:29 [dpdk-users] " 宋捷
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