[PATCH RFC 63/77] qlcnic: Update MSI/MSI-X interrupts enablement code

[Alexander Gordeev]

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev at redhat.com>
---
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c |   56 ++++++++++++---------
 1 files changed, 32 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index b94e679..a137c14 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -590,7 +590,37 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 	adapter->flags &= ~(QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED);
 
 	if (adapter->ahw->msix_supported) {
- enable_msix:
+		err = pci_msix_table_size(pdev);
+		if (err < 0)
+			goto fail;
+
+		if (err < num_msix) {
+			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 -ENOSPC;
+				err -= (max_tx_rings + 1);
+				num_msix = rounddown_pow_of_two(err);
+				num_msix += (max_tx_rings + 1);
+			} else {
+				num_msix = rounddown_pow_of_two(err);
+				if (qlcnic_check_multi_tx(adapter))
+					num_msix += max_tx_rings;
+			}
+
+			if (!num_msix) {
+				err = -ENOSPC;
+				goto fail;
+			}
+
+			dev_info(&pdev->dev,
+				 "Trying to allocate %d MSI-X interrupt vectors\n",
+				 num_msix);
+			}
+		}
+
 		for (i = 0; i < num_msix; i++)
 			adapter->msix_entries[i].entry = i;
 		err = pci_enable_msix(pdev, adapter->msix_entries, num_msix);
@@ -613,30 +643,8 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 				adapter->max_sds_rings = max_sds_rings;
 			}
 			dev_info(&pdev->dev, "using msi-x interrupts\n");
-		} 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 -ENOSPC;
-				err -= (max_tx_rings + 1);
-				num_msix = rounddown_pow_of_two(err);
-				num_msix += (max_tx_rings + 1);
-			} else {
-				num_msix = rounddown_pow_of_two(err);
-				if (qlcnic_check_multi_tx(adapter))
-					num_msix += max_tx_rings;
-			}
-
-			if (num_msix) {
-				dev_info(&pdev->dev,
-					 "Trying to allocate %d MSI-X interrupt vectors\n",
-					 num_msix);
-				goto enable_msix;
-			}
-			err = -ENOSPC;
 		} else {
+fail:
 			dev_info(&pdev->dev,
 				 "Unable to allocate %d MSI-X interrupt vectors\n",
 				 num_msix);
-- 
1.7.7.6