[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [Bug 1192464] [NEW] udp checksum computed as 0 not converte
From: |
bk.rakesh |
Subject: |
[Qemu-devel] [Bug 1192464] [NEW] udp checksum computed as 0 not converted to 0xffff, from guest os that share a common linux bridge among multiple guest os |
Date: |
Wed, 19 Jun 2013 07:14:09 -0000 |
Public bug reported:
UDP checksum computed as '0' during transmission of packets that uses
e1000 NIC in the Guest as well as emulated h/w in the qemu layer, That
needs to be converted to 0xffff, This occurs only when Hardware checksum
offload is been set in the guest OS NIC and made it as a transmitter.
The guest O.S use the N/W interface that is been shared to the linux
brige created in the host (used source=<bridge>) in the xml tags of
libvirt.
As per RFC768(http://tools.ietf.org/html/rfc768 [^]), If the computed
checksum is zero, it is transmitted as all ones (the equivalent in one's
complement arithmetic). An all zero transmitted checksum value means
that the transmitter generated no checksum (for debugging or for higher
level protocols that don't care).
** Affects: qemu
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1192464
Title:
udp checksum computed as 0 not converted to 0xffff, from guest os that
share a common linux bridge among multiple guest os
Status in QEMU:
New
Bug description:
UDP checksum computed as '0' during transmission of packets that uses
e1000 NIC in the Guest as well as emulated h/w in the qemu layer, That
needs to be converted to 0xffff, This occurs only when Hardware
checksum offload is been set in the guest OS NIC and made it as a
transmitter. The guest O.S use the N/W interface that is been shared
to the linux brige created in the host (used source=<bridge>) in the
xml tags of libvirt.
As per RFC768(http://tools.ietf.org/html/rfc768 [^]), If the computed
checksum is zero, it is transmitted as all ones (the equivalent in
one's complement arithmetic). An all zero transmitted checksum value
means that the transmitter generated no checksum (for debugging or for
higher level protocols that don't care).
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1192464/+subscriptions