[PATCH v2 0/2] hv_netvsc: associate VF and PV device by serial number
Lorenzo Pieralisi
lorenzo.pieralisi at arm.com
Thu Sep 20 14:18:20 UTC 2018
On Fri, Sep 14, 2018 at 12:54:55PM -0700, Stephen Hemminger wrote:
> The Hyper-V implementation of PCI controller has concept of 32 bit serial number
> (not to be confused with PCI-E serial number). This value is sent in the protocol
> from the host to indicate SR-IOV VF device is attached to a synthetic NIC.
>
> Using the serial number (instead of MAC address) to associate the two devices
> avoids lots of potential problems when there are duplicate MAC addresses from
> tunnels or layered devices.
>
> The patch set is broken into two parts, one is for the PCI controller
> and the other is for the netvsc device. Normally, these go through different
> trees but sending them together here for better review. The PCI changes
> were submitted previously, but the main review comment was "why do you
> need this?". This is why.
The question was more whether we should convert this serial number into
a PCI slot number (that has user space visibility and that is what you are
after) to improve the current matching, I do not question why you need
it, just for the records.
Lorenzo
> v2 - slot name can be shorter.
> remove locking when creating pci_slots; see comment for explaination
>
> Stephen Hemminger (2):
> PCI: hv: support reporting serial number as slot information
> hv_netvsc: pair VF based on serial number
>
> drivers/net/hyperv/netvsc.c | 3 ++
> drivers/net/hyperv/netvsc_drv.c | 58 ++++++++++++++++-------------
> drivers/pci/controller/pci-hyperv.c | 37 ++++++++++++++++++
> 3 files changed, 73 insertions(+), 25 deletions(-)
>
> --
> 2.18.0
>
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