Re: [virtio-dev] [PATCH] virtio_pci: support enabling VFs

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On May 30, 2018, at 1:55 AM, Tiwei Bie <tiwei.bie@xxxxxxxxx> wrote:

There is a new feature bit allocated in virtio spec to
support SR-IOV (Single Root I/O Virtualization):

https://github.com/oasis-tcs/virtio-spec/issues/11

This patch enables the support for this feature bit in
virtio driver.

Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
---
This patch depends on below proposal:
https://lists.oasis-open.org/archives/virtio-dev/201805/msg00154.html

This patch depends on below patch:
https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/virtualization&id=8effc395c2097e258fcedfc02ed4a66d45fb4238

 drivers/virtio/virtio_pci_common.c | 20 ++++++++++++++++++++
 drivers/virtio/virtio_pci_modern.c | 14 ++++++++++++++
 include/uapi/linux/virtio_config.h |  7 ++++++-
 3 files changed, 40 insertions(+), 1 deletion(-)


<snip>

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 308e2096291f..b7c1f4e7d59e 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -49,7 +49,7 @@

There is a value in the comment directly before this that should
be updated as well to be consistent with the new value for
VIRTIO_TRANSPORT_F_END below.

  * transport being used (eg. virtio_ring), the rest are per-device feature
  * bits. */
 #define VIRTIO_TRANSPORT_F_START	28
-#define VIRTIO_TRANSPORT_F_END		34
+#define VIRTIO_TRANSPORT_F_END		38

 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've

<snip>

--
Mark Rustad, Networking Division, Intel Corporation

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