[libvirt] [PATCH 0/3] Properly deal with multiple netdevs per PCI device when converting VF <-> PF

Laine Stump laine at laine.org
Fri Aug 4 03:36:41 UTC 2017

The commit log of Patch 1 explains the majority of the reason for
these patches. In short, they disambiguate the multiple netdevs per
PCI device on the SRIOV PF and VFs of a Mellanox dual port NIC *when
converting from a VF netdev to a PF netdev and vice versa*. This
permits us to set the vlan tag and MAC address for the correct VF
netdev (and detect the online status of the correct PF netdev for that
VF) when using a VF in macvtap passthrough mode. (in other words, with
these patches in place, it is possible to use *all* the VF netdevs on
both ports of a dual port mellanox NIC for macvtap passthrough.)

These patches *do not* solve the problem of saving/setting the mac
address/vlan tag for both ports when using a dual port VF for PCI
device assignment with VFIO (see my RFC email from yesterday). That is
a much more complex problem. (These patches are a prerequisite to
anything that might come out of that RFC though).

Laine Stump (3):
  util: new function virNetDevGetPhysPortID()
  util: support matching a phys_port_id in virPCIGetNetName()
  util: match phys_port_id when converting PF-netdev to/from VF-netdev

 src/libvirt_private.syms |  1 +
 src/util/virhostdev.c    |  2 +-
 src/util/virnetdev.c     | 84 +++++++++++++++++++++++++++++++++++++++++++++---
 src/util/virnetdev.h     |  5 +++
 src/util/virpci.c        | 49 ++++++++++++++++++++++------
 src/util/virpci.h        |  4 ++-
 6 files changed, 129 insertions(+), 16 deletions(-)


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