linux-kernel - About offload function of Virtio Nic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <AANLkTim5zUD18vmMeNSzo2o8UGg8pr8l1uPbSYmHamq8@mail.gmail.com>
Date:	Mon, 31 May 2010 07:44:52 +0800
From:	Amos Kong <kongjianjun@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	rusty@...tcorp.com.au, davem@...emloft.net, kvm@...r.kernel.org
Subject: About offload function of Virtio Nic

Hello all,

Can I ask some question of the offloading function with Virtio-NIC?

I'm interested in KVM virtualization. The virtual NIC is different
from real hardward. And there is also a big distance between
Virtio-NIC and E1000-NIC.
The offloading function of Virtio-NIC close related with the function
of host's real hardware.
Associate Feature bits:
VIRTIO_NET_F_GUEST_...
VIRTIO_NET_F_HOST_...

---------------------------------------------------
command:
enable rx:  guest) # ethtool -K eth0
enable tx:  guest) # ethtool -K eth0
enable gs: guest) # ethtool -K eth0
enable tso: guest) # ethtool -K eth0
enable gso: guest) # ethtool -K eth0
enable lro: guest) # ethtool -K eth0
enable gro: guest) # ethtool -K eth0

Those steps work well with Virtual E1000-NIC, but it always fail when
using Virtio-NIC.

---------------------------------------------------
After setup, I have two check method. For example:
1. enable tso
2. check the output of 'ethtool -k eth0'
3. send large file from guest to host by scp, listen by tcpdump during
transferring file. and check if there contains some large
packet($length > 1514).

The check method works with Virtual E1000-NIC, but it always fail when
using Virtio-NIC.

---------------------------------------------------
My question:
1. How to setup offloading function of Virtio-NIC?
2. How about my check method of offloading function(transferring file,
check packet length by tcpdump)?
3. Is there some detail user guide for Virtio-NIC?



Best Regards,
Amos
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/