https://lists.ubuntu.com/archives/kernel-team/2016-July/079182.html
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Yakkety)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux (Ubuntu Yakkety)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1603574
Title:
Hotplug remove and re-add adds PCI adapter to next PCI domain (PCI)
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Xenial:
In Progress
Status in linux source package in Yakkety:
Fix Committed
Bug description:
== Comment: #26 - Guilherme Guaglianoni Piccoli <gpicc...@br.ibm.com> -
2016-07-15 16:26:38 ==
When performing hotplug operations in PowerPC currently, if we remove a PHB
and re-add it later, its domain address is incremented. An example below (drmgr
is the tool we use in PowerPC to perform this operation):
(i) $> lspci
0000:60:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810
10 Gigabit Ethernet
0000:60:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810
10 Gigabit Ethernet
(ii) $> drmgr -c phb -s "PHB 20" -r # removing a PHB
(iii) $> lspci #empty
(iv) $> drmgr -c phb -s "PHB 20" -a # re-adding the PHB
(v) $> lspci
0001:60:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810
10 Gigabit Ethernet
0001:60:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810
10 Gigabit Ethernet
This behavior is harmful when kernel is using network predictable naming for
interfaces, for example, since after the PHB re-add, the PCI address of NIC
functions changes, and so the interfaces' naming also change. Recently, a patch
was merged to powerpc-next to avoid this situation, by relating the PCI domain
number with device-tree properties. With the patch, the above steps (i) and (v)
present the same output for lspci.
We want to ask Canonical to merge the patch in Ubuntu Xenial's kernel,
since it will solve multiple bugs we've experienced by performing NIC
hotplug - the commit is present on powerpc-next under the commit-id
63a72284b15.
A link to the patch:
https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/commit/?id=63a72284b159c569ec52f380c9
Thanks in advance,
Guilherme
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