[PATCH net-next v9 2/7] ixgbe: Add a new netdev op to allow/prevent a VF from querying an RSS info

[Vlad Zolotarov <vladz@cloudius-systems.com>]

Implements the new netdev op to allow user to enable/disable the ability
of a specific VF to query its RSS Indirection Table and an RSS Hash Key.

This patch limits the new feature support to 82599 and x540 devices only.
Support for other devices will be added later.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
---
New in v9:
   - Reduce the support to 82599 and x540 devices only.
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h       |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c  |  7 ++++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 30 ++++++++++++++++++++++++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h |  2 ++
 4 files changed, 40 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 42ed4b4..639aa1b 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -151,6 +151,7 @@ struct vf_data_storage {
 	u16 tx_rate;
 	u16 vlan_count;
 	u8 spoofchk_enabled;
+	bool rss_query_enabled;
 	unsigned int vf_api;
 };
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index a99bc5d..1b04cb1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -3656,6 +3656,12 @@ static void ixgbe_configure_virtualization(struct ixgbe_adapter *adapter)
 		if (hw->mac.ops.set_ethertype_anti_spoofing)
 			hw->mac.ops.set_ethertype_anti_spoofing(hw, true, i);
 	}
+
+	/* Enable/Disable RSS query feature  */
+	for (i = 0; i < adapter->num_vfs; i++)
+		ixgbe_ndo_set_vf_rss_query_en(adapter->netdev, i,
+					      adapter->vfinfo[i].rss_query_enabled);
+
 }
 
 static void ixgbe_set_rx_buffer_len(struct ixgbe_adapter *adapter)
@@ -8096,6 +8102,7 @@ static const struct net_device_ops ixgbe_netdev_ops = {
 	.ndo_set_vf_vlan	= ixgbe_ndo_set_vf_vlan,
 	.ndo_set_vf_rate	= ixgbe_ndo_set_vf_bw,
 	.ndo_set_vf_spoofchk	= ixgbe_ndo_set_vf_spoofchk,
+	.ndo_set_vf_rss_query_en = ixgbe_ndo_set_vf_rss_query_en,
 	.ndo_get_vf_config	= ixgbe_ndo_get_vf_config,
 	.ndo_get_stats64	= ixgbe_get_stats64,
 #ifdef CONFIG_IXGBE_DCB
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 09a291b..f08672a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -108,6 +108,15 @@ static int __ixgbe_enable_sriov(struct ixgbe_adapter *adapter)
 		/* enable spoof checking for all VFs */
 		for (i = 0; i < adapter->num_vfs; i++)
 			adapter->vfinfo[i].spoofchk_enabled = true;
+
+		/* We support VF RSS querying only for 82599 and x540 devices at
+		 * the moment. These devices share RSS indirection table and
+		 * RSS hash key with PF therefore we want to disable the
+		 * querying by default.
+		 */
+		for (i = 0; i < adapter->num_vfs; i++)
+			adapter->vfinfo[i].rss_query_enabled = 0;
+
 		return 0;
 	}
 
@@ -1330,6 +1339,26 @@ int ixgbe_ndo_set_vf_spoofchk(struct net_device *netdev, int vf, bool setting)
 	return 0;
 }
 
+int ixgbe_ndo_set_vf_rss_query_en(struct net_device *netdev, int vf,
+				  bool setting)
+{
+	struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+	/* This operation is currently supported only for 82599 and x540
+	 * devices.
+	 */
+	if (adapter->hw.mac.type < ixgbe_mac_82599EB ||
+	    adapter->hw.mac.type >= ixgbe_mac_X550)
+		return -EPERM;
+
+	if (vf >= adapter->num_vfs)
+		return -EINVAL;
+
+	adapter->vfinfo[vf].rss_query_enabled = setting;
+
+	return 0;
+}
+
 int ixgbe_ndo_get_vf_config(struct net_device *netdev,
 			    int vf, struct ifla_vf_info *ivi)
 {
@@ -1343,5 +1372,6 @@ int ixgbe_ndo_get_vf_config(struct net_device *netdev,
 	ivi->vlan = adapter->vfinfo[vf].pf_vlan;
 	ivi->qos = adapter->vfinfo[vf].pf_qos;
 	ivi->spoofchk = adapter->vfinfo[vf].spoofchk_enabled;
+	ivi->rss_query_en = adapter->vfinfo[vf].rss_query_enabled;
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
index 32c26d5..2c197e6 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
@@ -47,6 +47,8 @@ int ixgbe_ndo_set_vf_vlan(struct net_device *netdev, int queue, u16 vlan,
 int ixgbe_ndo_set_vf_bw(struct net_device *netdev, int vf, int min_tx_rate,
 			int max_tx_rate);
 int ixgbe_ndo_set_vf_spoofchk(struct net_device *netdev, int vf, bool setting);
+int ixgbe_ndo_set_vf_rss_query_en(struct net_device *netdev, int vf,
+				  bool setting);
 int ixgbe_ndo_get_vf_config(struct net_device *netdev,
 			    int vf, struct ifla_vf_info *ivi);
 void ixgbe_check_vf_rate_limit(struct ixgbe_adapter *adapter);
-- 
2.1.0