i40evf: add new fields to store user configuration of RSS

This patch adds new fields to i40e_vsi to store user configured
RSS config data and code to use it.

Change-ID: Ic5d3db8d9df52182b560248f8cdca9c5c7546879
Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40evf/i40evf.h

@@ -67,6 +67,8 @@ struct i40e_vsi {
 	u16 rx_itr_setting;
 	u16 tx_itr_setting;
 	u16 qs_handle;
+	u8 *rss_hkey_user; /* User configured hash keys */
+	u8 *rss_lut_user;  /* User configured lookup table entries */
 };
 
 /* How many Rx Buffers do we bundle into one write to the hardware ? */

drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c

@@ -678,9 +678,7 @@ static int i40evf_set_rxfh(struct net_device *netdev, const u32 *indir,
 {
 	struct i40evf_adapter *adapter = netdev_priv(netdev);
 	struct i40e_vsi *vsi = &adapter->vsi;
-	u8 seed_def[I40EVF_HKEY_ARRAY_SIZE];
-	u8 *seed = NULL, *lut;
-	int ret;
+	u8 *seed = NULL;
 	u16 i;
 
 	/* We do not allow change in unsupported parameters */
@@ -691,21 +689,28 @@ static int i40evf_set_rxfh(struct net_device *netdev, const u32 *indir,
 		return 0;
 
 	if (key) {
-		memcpy(seed_def, key, I40EVF_HKEY_ARRAY_SIZE);
-		seed = seed_def;
+		if (!vsi->rss_hkey_user) {
+			vsi->rss_hkey_user = kzalloc(I40EVF_HKEY_ARRAY_SIZE,
+						     GFP_KERNEL);
+			if (!vsi->rss_hkey_user)
+				return -ENOMEM;
+		}
+		memcpy(vsi->rss_hkey_user, key, I40EVF_HKEY_ARRAY_SIZE);
+		seed = vsi->rss_hkey_user;
+	}
+	if (!vsi->rss_lut_user) {
+		vsi->rss_lut_user = kzalloc(I40EVF_HLUT_ARRAY_SIZE,
+					    GFP_KERNEL);
+		if (!vsi->rss_lut_user)
+			return -ENOMEM;
 	}
-	lut = kzalloc(I40EVF_HLUT_ARRAY_SIZE, GFP_KERNEL);
-	if (!lut)
-		return -ENOMEM;
 
 	/* Each 32 bits pointed by 'indir' is stored with a lut entry */
 	for (i = 0; i < I40EVF_HLUT_ARRAY_SIZE; i++)
-		lut[i] = (u8)(indir[i]);
+		vsi->rss_lut_user[i] = (u8)(indir[i]);
 
-	ret = i40evf_config_rss(vsi, seed, lut, I40EVF_HLUT_ARRAY_SIZE);
-	kfree(lut);
-
-	return ret;
+	return i40evf_config_rss(vsi, seed, vsi->rss_lut_user,
+				 I40EVF_HLUT_ARRAY_SIZE);
 }
 
 static const struct ethtool_ops i40evf_ethtool_ops = {

drivers/net/ethernet/intel/i40evf/i40evf_main.c

@@ -1453,9 +1453,21 @@ static int i40evf_init_rss(struct i40evf_adapter *adapter)
 	lut = kzalloc(I40EVF_HLUT_ARRAY_SIZE, GFP_KERNEL);
 	if (!lut)
 		return -ENOMEM;
-	i40evf_fill_rss_lut(lut, I40EVF_HLUT_ARRAY_SIZE,
-			    adapter->num_active_queues);
-	netdev_rss_key_fill((void *)seed, I40EVF_HKEY_ARRAY_SIZE);
+
+	/* Use user configured lut if there is one, otherwise use default */
+	if (vsi->rss_lut_user)
+		memcpy(lut, vsi->rss_lut_user, I40EVF_HLUT_ARRAY_SIZE);
+	else
+		i40evf_fill_rss_lut(lut, I40EVF_HLUT_ARRAY_SIZE,
+				    adapter->num_active_queues);
+
+	/* Use user configured hash key if there is one, otherwise
+	 * user default.
+	 */
+	if (vsi->rss_hkey_user)
+		memcpy(seed, vsi->rss_hkey_user, I40EVF_HKEY_ARRAY_SIZE);
+	else
+		netdev_rss_key_fill((void *)seed, I40EVF_HKEY_ARRAY_SIZE);
 	ret = i40evf_config_rss(vsi, seed, lut, I40EVF_HLUT_ARRAY_SIZE);
 	kfree(lut);
 
@@ -1582,6 +1594,22 @@ int i40evf_init_interrupt_scheme(struct i40evf_adapter *adapter)
 	return err;
 }
 
+/**
+ * i40evf_clear_rss_config_user - Clear user configurations of RSS
+ * @vsi: Pointer to VSI structure
+ **/
+static void i40evf_clear_rss_config_user(struct i40e_vsi *vsi)
+{
+	if (!vsi)
+		return;
+
+	kfree(vsi->rss_hkey_user);
+	vsi->rss_hkey_user = NULL;
+
+	kfree(vsi->rss_lut_user);
+	vsi->rss_lut_user = NULL;
+}
+
 /**
  * i40evf_watchdog_timer - Periodic call-back timer
  * @data: pointer to adapter disguised as unsigned long
@@ -2770,6 +2798,9 @@ static void i40evf_remove(struct pci_dev *pdev)
 
 	flush_scheduled_work();
 
+	/* Clear user configurations for RSS */
+	i40evf_clear_rss_config_user(&adapter->vsi);
+
 	if (hw->aq.asq.count)
 		i40evf_shutdown_adminq(hw);