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

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Message-Id: <c92efbde96541d08f37510422c096d543bb01279.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:19 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>, Jon Mason <jon.mason@...el.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	linux-pci@...r.kernel.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux390@...ibm.com,
	linux-s390@...r.kernel.org, x86@...nel.org,
	linux-ide@...r.kernel.org, iss_storagedev@...com,
	linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-driver@...gic.com,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>, linux-scsi@...r.kernel.org
Subject: [PATCH RFC 63/77] qlcnic: Update MSI/MSI-X interrupts enablement code

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@...hat.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

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