Re: [net-next PATCH v2 2/6] i40e: Introduce VF Port Representator(VFPR) netdevs.

VF Port Representator netdevs are created for each VF if the switch mode
is set to 'switchdev'. These netdevs can be used to control and configure
VFs from PFs namespace. They enable exposing VF statistics, configure and
monitor link state, mtu, filters, fdb/vlan entries etc. of VFs.
Broadcast filters are not enabled in switchdev mode.

Sample script to create VF port representors
# rmmod i40e; modprobe i40e
# devlink dev eswitch set pci/0000:05:00.0 mode switchdev
# echo 2 > /sys/class/net/enp5s0f0/device/sriov_numvfs
# ip l show
297: enp5s0f0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop portid 6805ca2e7268 state DOWN mode DEFAULT group default qlen 1000
    link/ether 68:05:ca:2e:72:68 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off
    vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off
299: enp5s0f0-vf0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
300: enp5s0f0-vf1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
---
drivers/net/ethernet/intel/i40e/i40e_main.c        |  21 ++-
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 154 ++++++++++++++++++++-
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h |  14 ++
3 files changed, 182 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index c01a620..17428f0 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -10938,15 +10938,34 @@ static int i40e_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)

static int i40e_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode)
{
	struct i40e_pf *pf = devlink_priv(devlink);
-	int err = 0;
+	struct i40e_vf *vf;
+	int i, j, err = 0;

	if (mode == pf->eswitch_mode)
		goto done;

	switch (mode) {
	case DEVLINK_ESWITCH_MODE_LEGACY:
+		for (i = 0; i < pf->num_alloc_vfs; i++) {
+			vf = &(pf->vf[i]);
+			i40e_free_vfpr_netdev(vf);
+		}
		pf->eswitch_mode = mode;
		break;
+	case DEVLINK_ESWITCH_MODE_SWITCHDEV:
+		for (i = 0; i < pf->num_alloc_vfs; i++) {
+			vf = &(pf->vf[i]);
+			err = i40e_alloc_vfpr_netdev(vf, i);
+			if (err) {
+				for (j = 0; j < i; j++) {
+					vf = &(pf->vf[j]);
+					i40e_free_vfpr_netdev(vf);
+				}
+				goto done;
+			}
+		}
+                pf->eswitch_mode = mode;