qlcnic: Enhance logic to calculate msix vectors.

o Refactored MSI-x vector calculation for All adapters.
  Decoupled logic in the code which was using same call to
  request MSI-x vectors in default driver load, as well as
  during set_channel() operation for TSS/RSS. This refactoring
  simplifies code for TSS/RSS code path as well as probe path
  of the driver load for all adapters.

Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

@@ -105,6 +105,8 @@
 #define QLCNIC_DEF_TX_RINGS		4
 #define QLCNIC_MAX_VNIC_TX_RINGS	4
 #define QLCNIC_MAX_VNIC_SDS_RINGS	4
+#define QLCNIC_83XX_MINIMUM_VECTOR	3
+#define QLCNIC_82XX_MINIMUM_VECTOR	2
 
 enum qlcnic_queue_type {
 	QLCNIC_TX_QUEUE = 1,
@@ -962,6 +964,7 @@ struct qlcnic_ipaddr {
 #define QLCNIC_TX_INTR_SHARED		0x10000
 #define QLCNIC_APP_CHANGED_FLAGS	0x20000
 #define QLCNIC_HAS_PHYS_PORT_ID		0x40000
+#define QLCNIC_TSS_RSS			0x80000
 
 #define QLCNIC_IS_MSI_FAMILY(adapter) \
 	((adapter)->flags & (QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED))
@@ -1058,6 +1061,9 @@ struct qlcnic_adapter {
 	u8 drv_tx_rings;  /* max tx rings supported by driver */
 	u8 drv_sds_rings; /* max sds rings supported by driver */
 
+	u8 drv_tss_rings; /* tss ring input */
+	u8 drv_rss_rings; /* rss ring input */
+
 	u8 rx_csum;
 	u8 portnum;
 
@@ -1574,7 +1580,7 @@ int qlcnic_diag_alloc_res(struct net_device *netdev, int);
 netdev_tx_t qlcnic_xmit_frame(struct sk_buff *, struct net_device *);
 void qlcnic_set_tx_ring_count(struct qlcnic_adapter *, u8);
 void qlcnic_set_sds_ring_count(struct qlcnic_adapter *, u8);
-int qlcnic_setup_rings(struct qlcnic_adapter *, u8, u8);
+int qlcnic_setup_rings(struct qlcnic_adapter *);
 int qlcnic_validate_rings(struct qlcnic_adapter *, __u32, int);
 void qlcnic_alloc_lb_filters_mem(struct qlcnic_adapter *adapter);
 int qlcnic_enable_msix(struct qlcnic_adapter *, u32);
@@ -1614,7 +1620,7 @@ void qlcnic_set_vlan_config(struct qlcnic_adapter *,
 			    struct qlcnic_esw_func_cfg *);
 void qlcnic_set_eswitch_port_features(struct qlcnic_adapter *,
 				      struct qlcnic_esw_func_cfg *);
-
+int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter  *);
 void qlcnic_down(struct qlcnic_adapter *, struct net_device *);
 int qlcnic_up(struct qlcnic_adapter *, struct net_device *);
 void __qlcnic_down(struct qlcnic_adapter *, struct net_device *);
@@ -1671,11 +1677,8 @@ static inline int qlcnic_set_real_num_queues(struct qlcnic_adapter *adapter,
 
 	err = netif_set_real_num_tx_queues(netdev, adapter->drv_tx_rings);
 	if (err)
-		dev_err(&adapter->pdev->dev, "failed to set %d Tx queues\n",
-			adapter->drv_tx_rings);
-	else
-		dev_info(&adapter->pdev->dev, "Set %d Tx queues\n",
-			 adapter->drv_tx_rings);
+		netdev_err(netdev, "failed to set %d Tx queues\n",
+			   adapter->drv_tx_rings);
 
 	return err;
 }

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c

@@ -290,11 +290,22 @@ int qlcnic_83xx_wrt_reg_indirect(struct qlcnic_adapter *adapter, ulong addr,
 	}
 }
 
-int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter)
+static void qlcnic_83xx_enable_legacy(struct qlcnic_adapter *adapter)
 {
-	int err, i, num_msix;
 	struct qlcnic_hardware_context *ahw = adapter->ahw;
 
+	/* MSI-X enablement failed, use legacy interrupt */
+	adapter->tgt_status_reg = ahw->pci_base0 + QLC_83XX_INTX_PTR;
+	adapter->tgt_mask_reg = ahw->pci_base0 + QLC_83XX_INTX_MASK;
+	adapter->isr_int_vec = ahw->pci_base0 + QLC_83XX_INTX_TRGR;
+	adapter->msix_entries[0].vector = adapter->pdev->irq;
+	dev_info(&adapter->pdev->dev, "using legacy interrupt\n");
+}
+
+static int qlcnic_83xx_calculate_msix_vector(struct qlcnic_adapter *adapter)
+{
+	int num_msix;
+
 	num_msix = adapter->drv_sds_rings;
 
 	/* account for AEN interrupt MSI-X based interrupts */
@@ -303,30 +314,44 @@ int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter)
 	if (!(adapter->flags & QLCNIC_TX_INTR_SHARED))
 		num_msix += adapter->drv_tx_rings;
 
-	err = qlcnic_enable_msix(adapter, num_msix);
-	if (err == -ENOMEM)
-		return err;
-	if (adapter->flags & QLCNIC_MSIX_ENABLED)
-		num_msix = adapter->ahw->num_msix;
-	else {
-		if (qlcnic_sriov_vf_check(adapter))
-			return -EINVAL;
-		num_msix = 1;
-		adapter->drv_tx_rings = QLCNIC_SINGLE_RING;
+	return num_msix;
+}
+
+int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_hardware_context *ahw = adapter->ahw;
+	int err, i, num_msix;
+
+	if (adapter->flags & QLCNIC_TSS_RSS) {
+		err = qlcnic_setup_tss_rss_intr(adapter);
+		if (err < 0)
+			return err;
+		num_msix = ahw->num_msix;
+	} else {
+		num_msix = qlcnic_83xx_calculate_msix_vector(adapter);
+
+		err = qlcnic_enable_msix(adapter, num_msix);
+		if (err == -ENOMEM)
+			return err;
+
+		if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+			num_msix = ahw->num_msix;
+		} else {
+			if (qlcnic_sriov_vf_check(adapter))
+				return -EINVAL;
+			num_msix = 1;
+			adapter->drv_tx_rings = QLCNIC_SINGLE_RING;
+		}
 	}
+
 	/* setup interrupt mapping table for fw */
 	ahw->intr_tbl = vzalloc(num_msix *
 				sizeof(struct qlcnic_intrpt_config));
 	if (!ahw->intr_tbl)
 		return -ENOMEM;
-	if (!(adapter->flags & QLCNIC_MSIX_ENABLED)) {
-		/* MSI-X enablement failed, use legacy interrupt */
-		adapter->tgt_status_reg = ahw->pci_base0 + QLC_83XX_INTX_PTR;
-		adapter->tgt_mask_reg = ahw->pci_base0 + QLC_83XX_INTX_MASK;
-		adapter->isr_int_vec = ahw->pci_base0 + QLC_83XX_INTX_TRGR;
-		adapter->msix_entries[0].vector = adapter->pdev->irq;
-		dev_info(&adapter->pdev->dev, "using legacy interrupt\n");
-	}
+
+	if (!(adapter->flags & QLCNIC_MSIX_ENABLED))
+		qlcnic_83xx_enable_legacy(adapter);
 
 	for (i = 0; i < num_msix; i++) {
 		if (adapter->flags & QLCNIC_MSIX_ENABLED)
@@ -336,6 +361,7 @@ int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter)
 		ahw->intr_tbl[i].id = i;
 		ahw->intr_tbl[i].src = 0;
 	}
+
 	return 0;
 }
 
@@ -1286,8 +1312,8 @@ int qlcnic_83xx_create_tx_ctx(struct qlcnic_adapter *adapter,
 	/* send the mailbox command*/
 	err = qlcnic_issue_cmd(adapter, &cmd);
 	if (err) {
-		dev_err(&adapter->pdev->dev,
-			"Failed to create Tx ctx in firmware 0x%x\n", err);
+		netdev_err(adapter->netdev,
+			   "Failed to create Tx ctx in firmware 0x%x\n", err);
 		goto out;
 	}
 	mbx_out = (struct qlcnic_tx_mbx_out *)&cmd.rsp.arg[2];
@@ -1298,8 +1324,9 @@ int qlcnic_83xx_create_tx_ctx(struct qlcnic_adapter *adapter,
 		intr_mask = ahw->intr_tbl[adapter->drv_sds_rings + ring].src;
 		tx->crb_intr_mask = ahw->pci_base0 + intr_mask;
 	}
-	dev_info(&adapter->pdev->dev, "Tx Context[0x%x] Created, state:0x%x\n",
-		 tx->ctx_id, mbx_out->state);
+	netdev_info(adapter->netdev,
+		    "Tx Context[0x%x] Created, state:0x%x\n",
+		    tx->ctx_id, mbx_out->state);
 out:
 	qlcnic_free_mbx_args(&cmd);
 	return err;

drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c

@@ -736,6 +736,7 @@ static int qlcnic_set_channels(struct net_device *dev,
 				   channel->rx_count);
 			return err;
 		}
+		adapter->drv_rss_rings = channel->rx_count;
 	}
 
 	if (channel->tx_count) {
@@ -746,10 +747,12 @@ static int qlcnic_set_channels(struct net_device *dev,
 				   channel->tx_count);
 			return err;
 		}
+		adapter->drv_tss_rings = channel->tx_count;
 	}
 
-	err = qlcnic_setup_rings(adapter, channel->rx_count,
-				 channel->tx_count);
+	adapter->flags |= QLCNIC_TSS_RSS;
+
+	err = qlcnic_setup_rings(adapter);
 	netdev_info(dev, "Allocated %d SDS rings and %d Tx rings\n",
 		    adapter->drv_sds_rings, adapter->drv_tx_rings);
 

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -603,9 +603,6 @@ void qlcnic_set_tx_ring_count(struct qlcnic_adapter *adapter, u8 tx_cnt)
 							 QLCNIC_TX_QUEUE);
 	else
 		adapter->drv_tx_rings = tx_cnt;
-
-	dev_info(&adapter->pdev->dev, "Set %d Tx rings\n",
-		 adapter->drv_tx_rings);
 }
 
 void qlcnic_set_sds_ring_count(struct qlcnic_adapter *adapter, u8 rx_cnt)
@@ -616,25 +613,79 @@ void qlcnic_set_sds_ring_count(struct qlcnic_adapter *adapter, u8 rx_cnt)
 							  QLCNIC_RX_QUEUE);
 	else
 		adapter->drv_sds_rings = rx_cnt;
-
-	dev_info(&adapter->pdev->dev, "Set %d SDS rings\n",
-		 adapter->drv_sds_rings);
 }
 
-int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
+int qlcnic_setup_tss_rss_intr(struct qlcnic_adapter *adapter)
 {
 	struct pci_dev *pdev = adapter->pdev;
-	int drv_tx_rings, drv_sds_rings, tx_vector;
-	int err = -1, i;
+	int num_msix = 0, err = 0, vector;
+
+	adapter->flags &= ~QLCNIC_TSS_RSS;
+
+	if (adapter->drv_tss_rings > 0)
+		num_msix += adapter->drv_tss_rings;
+	else
+		num_msix += adapter->drv_tx_rings;
+
+	if (adapter->drv_rss_rings  > 0)
+		num_msix += adapter->drv_rss_rings;
+	else
+		num_msix += adapter->drv_sds_rings;
+
+	if (qlcnic_83xx_check(adapter))
+		num_msix += 1;
+
+	if (!adapter->msix_entries) {
+		adapter->msix_entries = kcalloc(num_msix,
+						sizeof(struct msix_entry),
+						GFP_KERNEL);
+		if (!adapter->msix_entries)
+			return -ENOMEM;
+	}
+
+restore:
+	for (vector = 0; vector < num_msix; vector++)
+		adapter->msix_entries[vector].entry = vector;
+
+	err = pci_enable_msix(pdev, adapter->msix_entries, num_msix);
+	if (err == 0) {
+		adapter->ahw->num_msix = num_msix;
+		if (adapter->drv_tss_rings > 0)
+			adapter->drv_tx_rings = adapter->drv_tss_rings;
 
-	if (adapter->flags & QLCNIC_TX_INTR_SHARED) {
-		drv_tx_rings = 0;
-		tx_vector = 0;
+		if (adapter->drv_rss_rings > 0)
+			adapter->drv_sds_rings = adapter->drv_rss_rings;
 	} else {
-		drv_tx_rings = adapter->drv_tx_rings;
-		tx_vector = 1;
+		netdev_info(adapter->netdev,
+			    "Unable to allocate %d MSI-X vectors, Available vectors %d\n",
+			    num_msix, err);
+
+		num_msix = adapter->drv_tx_rings + adapter->drv_sds_rings;
+
+		/* Set rings to 0 so we can restore original TSS/RSS count */
+		adapter->drv_tss_rings = 0;
+		adapter->drv_rss_rings = 0;
+
+		if (qlcnic_83xx_check(adapter))
+			num_msix += 1;
+
+		netdev_info(adapter->netdev,
+			    "Restoring %d Tx, %d SDS rings for total %d vectors.\n",
+			    adapter->drv_tx_rings, adapter->drv_sds_rings,
+			    num_msix);
+		goto restore;
+
+		err = -EIO;
 	}
 
+	return err;
+}
+
+int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	int err = -1, vector;
+
 	if (!adapter->msix_entries) {
 		adapter->msix_entries = kcalloc(num_msix,
 						sizeof(struct msix_entry),
@@ -643,47 +694,43 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 			return -ENOMEM;
 	}
 
-	adapter->drv_sds_rings = QLCNIC_SINGLE_RING;
 	adapter->flags &= ~(QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED);
 
 	if (adapter->ahw->msix_supported) {
- enable_msix:
-		for (i = 0; i < num_msix; i++)
-			adapter->msix_entries[i].entry = i;
+enable_msix:
+		for (vector = 0; vector < num_msix; vector++)
+			adapter->msix_entries[vector].entry = vector;
+
 		err = pci_enable_msix(pdev, adapter->msix_entries, num_msix);
 		if (err == 0) {
 			adapter->flags |= QLCNIC_MSIX_ENABLED;
-			if (qlcnic_83xx_check(adapter)) {
-				adapter->ahw->num_msix = num_msix;
-				/* subtract mail box and tx ring vectors */
-				adapter->drv_sds_rings = num_msix -
-							 drv_tx_rings - 1;
-			} else {
-				adapter->ahw->num_msix = num_msix;
-				if (qlcnic_check_multi_tx(adapter) &&
-				    !adapter->ahw->diag_test)
-					drv_sds_rings = num_msix - drv_tx_rings;
-				else
-					drv_sds_rings = num_msix;
-
-				adapter->drv_sds_rings = drv_sds_rings;
-			}
+			adapter->ahw->num_msix = num_msix;
 			dev_info(&pdev->dev, "using msi-x interrupts\n");
 			return err;
 		} else if (err > 0) {
 			dev_info(&pdev->dev,
-				 "Unable to allocate %d MSI-X interrupt vectors\n",
-				 num_msix);
-			if (qlcnic_83xx_check(adapter)) {
-				if (err < (QLC_83XX_MINIMUM_VECTOR - tx_vector))
-					return err;
-				err -= drv_tx_rings + 1;
+				 "Unable to allocate %d MSI-X vectors, Available vectors %d\n",
+				 num_msix, err);
+
+			if (qlcnic_82xx_check(adapter)) {
 				num_msix = rounddown_pow_of_two(err);
-				num_msix += drv_tx_rings + 1;
+				if (err < QLCNIC_82XX_MINIMUM_VECTOR)
+					return -EIO;
 			} else {
-				num_msix = rounddown_pow_of_two(err);
-				if (qlcnic_check_multi_tx(adapter))
-					num_msix += drv_tx_rings;
+				num_msix = rounddown_pow_of_two(err - 1);
+				num_msix += 1;
+				if (err < QLCNIC_83XX_MINIMUM_VECTOR)
+					return -EIO;
+			}
+
+			if (qlcnic_82xx_check(adapter) &&
+			    !qlcnic_check_multi_tx(adapter)) {
+				adapter->drv_sds_rings = num_msix;
+				adapter->drv_tx_rings = QLCNIC_SINGLE_RING;
+			} else {
+				/* Distribute vectors equally */
+				adapter->drv_tx_rings = num_msix / 2;
+				adapter->drv_sds_rings = adapter->drv_tx_rings;
 			}
 
 			if (num_msix) {
@@ -694,14 +741,29 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 			}
 		} else {
 			dev_info(&pdev->dev,
-				 "Unable to allocate %d MSI-X interrupt vectors\n",
-				 num_msix);
+				 "Unable to allocate %d MSI-X vectors, err=%d\n",
+				 num_msix, err);
+			return err;
 		}
 	}
 
 	return err;
 }
 
+static int qlcnic_82xx_calculate_msix_vector(struct qlcnic_adapter *adapter)
+{
+	int num_msix;
+
+	num_msix = adapter->drv_sds_rings;
+
+	if (qlcnic_check_multi_tx(adapter))
+		num_msix += adapter->drv_tx_rings;
+	else
+		num_msix += QLCNIC_SINGLE_RING;
+
+	return num_msix;
+}
+
 static int qlcnic_enable_msi_legacy(struct qlcnic_adapter *adapter)
 {
 	int err = 0;
@@ -740,21 +802,25 @@ static int qlcnic_82xx_setup_intr(struct qlcnic_adapter *adapter)
 {
 	int num_msix, err = 0;
 
-	num_msix = adapter->drv_sds_rings;
-
-	if (qlcnic_check_multi_tx(adapter))
-		num_msix += adapter->drv_tx_rings;
+	if (adapter->flags & QLCNIC_TSS_RSS) {
+		err = qlcnic_setup_tss_rss_intr(adapter);
+		if (err < 0)
+			return err;
+		num_msix = adapter->ahw->num_msix;
+	} else {
+		num_msix = qlcnic_82xx_calculate_msix_vector(adapter);
 
-	err = qlcnic_enable_msix(adapter, num_msix);
-	if (err == -ENOMEM)
-		return err;
+		err = qlcnic_enable_msix(adapter, num_msix);
+		if (err == -ENOMEM)
+			return err;
 
-	if (!(adapter->flags & QLCNIC_MSIX_ENABLED)) {
-		qlcnic_disable_multi_tx(adapter);
+		if (!(adapter->flags & QLCNIC_MSIX_ENABLED)) {
+			qlcnic_disable_multi_tx(adapter);
 
-		err = qlcnic_enable_msi_legacy(adapter);
-		if (!err)
-			return err;
+			err = qlcnic_enable_msi_legacy(adapter);
+			if (!err)
+				return err;
+		}
 	}
 
 	return 0;
@@ -3834,7 +3900,7 @@ int qlcnic_validate_rings(struct qlcnic_adapter *adapter, __u32 ring_cnt,
 	return 0;
 }
 
-int qlcnic_setup_rings(struct qlcnic_adapter *adapter, u8 rx_cnt, u8 tx_cnt)
+int qlcnic_setup_rings(struct qlcnic_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
 	int err;
@@ -3855,12 +3921,6 @@ int qlcnic_setup_rings(struct qlcnic_adapter *adapter, u8 rx_cnt, u8 tx_cnt)
 
 	qlcnic_teardown_intr(adapter);
 
-	/* compute and set default and max tx/sds rings */
-	qlcnic_set_tx_ring_count(adapter, tx_cnt);
-	qlcnic_set_sds_ring_count(adapter, rx_cnt);
-
-	netif_set_real_num_tx_queues(netdev, adapter->drv_tx_rings);
-
 	err = qlcnic_setup_intr(adapter);
 	if (err) {
 		kfree(adapter->msix_entries);
@@ -3868,6 +3928,8 @@ int qlcnic_setup_rings(struct qlcnic_adapter *adapter, u8 rx_cnt, u8 tx_cnt)
 		return err;
 	}
 
+	netif_set_real_num_tx_queues(netdev, adapter->drv_tx_rings);
+
 	if (qlcnic_83xx_check(adapter)) {
 		qlcnic_83xx_initialize_nic(adapter, 1);
 		err = qlcnic_83xx_setup_mbx_intr(adapter);