From: "jiangheng (G)" <jiangheng14@huawei.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
"chenbo.xia@intel.com" <chenbo.xia@intel.com>,
"users@dpdk.org" <users@dpdk.org>
Subject: 答复: why does virtio not support IPv4 CKSUM?
Date: Fri, 7 Jul 2023 12:21:37 +0000 [thread overview]
Message-ID: <9f63ee93df344a0f97732d28a31b6150@huawei.com> (raw)
In-Reply-To: <20230706073737.24bc2201@hermes.local>
>> Hi
>>
>> why does virtio not support IPv4 CKSUM? But support TCP/UDP cksum.
> Because virtio is a software driver developed on Linux and Linux doesn't need/want IP checksum offload.
> It takes longer to look at offload bits then to compute checksum in SW.
However, Virtio supports LRO. Is it possible to merge packets with incorrect cksum?
>>
>> If not support ipv4 cksum, when I use GRO, the ip cksum of the packets transmitted to ip layer will be incorrect.
>> I have to calculate ip cksum before packet was transmiited to ip layer.
>> So why does virtio not support ipv4 cksum ?
next prev parent reply other threads:[~2023-07-07 12:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-06 3:47 jiangheng (G)
2023-07-06 14:37 ` Stephen Hemminger
2023-07-07 12:21 ` jiangheng (G) [this message]
2023-07-07 12:34 ` jiangheng (G)
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