netdev - [PATCH] virtio-net: enable SRIOV

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Date:   Mon, 26 Apr 2021 12:21:35 +0200
From:   Arkadiusz Kudan <arkadiusz.kudan@...ilime.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     mst@...hat.com, jasowang@...hat.com, netdev@...r.kernel.org,
        Arkadiusz Kudan <arkadiusz.kudan@...ilime.com>,
        Miroslaw Walukiewicz <Miroslaw.Walukiewicz@...el.com>
Subject: [PATCH] virtio-net: enable SRIOV

With increasing interest for virtio, NIC have appeared that provide
SRIOV with PF appearing in the host as a virtio network device
and probably more similiar NICs will emerge.
igb_uio of DPDK or pci-pf-stub can be used to provide SRIOV,
however there are hypervisors/VMMs that require VFs, which are
to be PCI passthrued to a VM, to have its PF with network
representation in the kernel. For virtio-net based PFs,
virtio-net could do that by providing both SRIOV interface and
netdev representation.

Enable SRIOV via VIRTIO_F_SR_IOV feature bit if the device
supports it.

Signed-off-by: Arkadiusz Kudan <arkadiusz.kudan@...ilime.com>
Signed-off-by: Miroslaw Walukiewicz <Miroslaw.Walukiewicz@...el.com>
---
 drivers/net/virtio_net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 0824e6999e49..a03aa7e99689 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3249,6 +3249,7 @@ static struct virtio_device_id id_table[] = {
 
 static unsigned int features[] = {
 	VIRTNET_FEATURES,
+	VIRTIO_F_SR_IOV,
 };
 
 static unsigned int features_legacy[] = {
-- 
2.31.1


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