i40e: support VF link state ndo

This netdev op allows the PF driver to control the virtual link state of
the VF devices. This can be used to deny naughty VF drivers access to
the wire, or to allow VFs (regardless of temperament) to communicate
with each other over the device's internal switch even though external
link is down.

Add the actual ndo function, and modify vc_notify_link_state to check
the link status of each VF before sending a message in the case when
physical link changes state.

Change-ID: Ib5a6924da78c540789f21d26b5e8086d71c29384
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 80 insertions, 6 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 7839343b967b..2086a62062c2 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1920,15 +1920,28 @@ static void i40e_vc_vf_broadcast(struct i40e_pf *pf,
 void i40e_vc_notify_link_state(struct i40e_pf *pf)
 {
 	struct i40e_virtchnl_pf_event pfe;
+	struct i40e_hw *hw = &pf->hw;
+	struct i40e_vf *vf = pf->vf;
+	struct i40e_link_status *ls = &pf->hw.phy.link_info;
+	int i;
 
 	pfe.event = I40E_VIRTCHNL_EVENT_LINK_CHANGE;
 	pfe.severity = I40E_PF_EVENT_SEVERITY_INFO;
-	pfe.event_data.link_event.link_status =
-	    pf->hw.phy.link_info.link_info & I40E_AQ_LINK_UP;
-	pfe.event_data.link_event.link_speed = pf->hw.phy.link_info.link_speed;
-
-	i40e_vc_vf_broadcast(pf, I40E_VIRTCHNL_OP_EVENT, I40E_SUCCESS,
-			     (u8 *)&pfe, sizeof(struct i40e_virtchnl_pf_event));
+	for (i = 0; i < pf->num_alloc_vfs; i++) {
+		if (vf->link_forced) {
+			pfe.event_data.link_event.link_status = vf->link_up;
+			pfe.event_data.link_event.link_speed =
+				(vf->link_up ? I40E_LINK_SPEED_40GB : 0);
+		} else {
+			pfe.event_data.link_event.link_status =
+				ls->link_info & I40E_AQ_LINK_UP;
+			pfe.event_data.link_event.link_speed = ls->link_speed;
+		}
+		i40e_aq_send_msg_to_vf(hw, vf->vf_id, I40E_VIRTCHNL_OP_EVENT,
+				       0, (u8 *)&pfe, sizeof(pfe),
+				       NULL);
+		vf++;
+	}
 }
 
 /**
@@ -2193,3 +2206,64 @@ int i40e_ndo_get_vf_config(struct net_device *netdev,
 error_param:
 	return ret;
 }
+
+/**
+ * i40e_ndo_set_vf_link_state
+ * @netdev: network interface device structure
+ * @vf_id: vf identifier
+ * @link: required link state
+ *
+ * Set the link state of a specified VF, regardless of physical link state
+ **/
+int i40e_ndo_set_vf_link_state(struct net_device *netdev, int vf_id, int link)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_pf *pf = np->vsi->back;
+	struct i40e_virtchnl_pf_event pfe;
+	struct i40e_hw *hw = &pf->hw;
+	struct i40e_vf *vf;
+	int ret = 0;
+
+	/* validate the request */
+	if (vf_id >= pf->num_alloc_vfs) {
+		dev_err(&pf->pdev->dev, "Invalid VF Identifier %d\n", vf_id);
+		ret = -EINVAL;
+		goto error_out;
+	}
+
+	vf = &pf->vf[vf_id];
+
+	pfe.event = I40E_VIRTCHNL_EVENT_LINK_CHANGE;
+	pfe.severity = I40E_PF_EVENT_SEVERITY_INFO;
+
+	switch (link) {
+	case IFLA_VF_LINK_STATE_AUTO:
+		vf->link_forced = false;
+		pfe.event_data.link_event.link_status =
+			pf->hw.phy.link_info.link_info & I40E_AQ_LINK_UP;
+		pfe.event_data.link_event.link_speed =
+			pf->hw.phy.link_info.link_speed;
+		break;
+	case IFLA_VF_LINK_STATE_ENABLE:
+		vf->link_forced = true;
+		vf->link_up = true;
+		pfe.event_data.link_event.link_status = true;
+		pfe.event_data.link_event.link_speed = I40E_LINK_SPEED_40GB;
+		break;
+	case IFLA_VF_LINK_STATE_DISABLE:
+		vf->link_forced = true;
+		vf->link_up = false;
+		pfe.event_data.link_event.link_status = false;
+		pfe.event_data.link_event.link_speed = 0;
+		break;
+	default:
+		ret = -EINVAL;
+		goto error_out;
+	}
+	/* Notify the VF of its new link state */
+	i40e_aq_send_msg_to_vf(hw, vf->vf_id, I40E_VIRTCHNL_OP_EVENT,
+			       0, (u8 *)&pfe, sizeof(pfe), NULL);
+
+error_out:
+	return ret;
+}