The following patch fixes the bug :
-------------------
commit bda7fab54828bbef2164bb23c0f6b1a7d05cc718
Author: Jay Vosburgh <[email protected]>
Date: Thu Mar 22 14:42:41 2018 +0000
virtio-net: Fix operstate for virtio when no VIRTIO_NET_F_STATUS
The operstate update logic will leave an interface in the
default UNKNOWN operstate if the interface carrier state never changes
from the default carrier up state set at creation. This includes the
case of an explicit call to netif_carrier_on, as the carrier on to on
transition has no effect on operstate.
This affects virtio-net for the case that the virtio peer does
not support VIRTIO_NET_F_STATUS (the feature that provides carrier state
updates). Without this feature, the virtio specification states that
"the link should be assumed active," so, logically, the operstate should
be UP instead of UNKNOWN. This has impact on user space applications
that use the operstate to make availability decisions for the interface.
Resolve this by changing the virtio probe logic slightly to call
netif_carrier_off for both the "with" and "without" VIRTIO_NET_F_STATUS
cases, and then the existing call to netif_carrier_on for the "without"
case will cause an operstate transition.
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Ben Hutchings <[email protected]>
Signed-off-by: Jay Vosburgh <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
-------------------
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Eric Desrochers (slashd)
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Bionic)
Importance: Medium
Assignee: Eric Desrochers (slashd)
Status: In Progress
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Assignee: (unassigned) => Eric Desrochers (slashd)
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Eric Desrochers (slashd)
** Changed in: linux (Ubuntu Artful)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Artful)
Status: New => In Progress
** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1761534
Title:
"ip a" command on a guest VM shows UNKNOWN status
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