linux-kernel - [PATCH RFC 50/77] mlx5: Update MSI/MSI-X interrupts enablement code

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Message-Id: <9650a7dfbcfd5f1da21f7b093665abf4b1041071.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:06 +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 50/77] mlx5: 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/mellanox/mlx5/core/main.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index adf0e5d..5c21e50 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -119,8 +119,13 @@ static int mlx5_enable_msix(struct mlx5_core_dev *dev)
 	int err;
 	int i;
 
+	err = pci_msix_table_size(dev->pdev);
+	if (err < 0)
+		return err;
+
 	nvec = dev->caps.num_ports * num_online_cpus() + MLX5_EQ_VEC_COMP_BASE;
 	nvec = min_t(int, nvec, num_eqs);
+	nvec = min_t(int, nvec, err);
 	if (nvec <= MLX5_EQ_VEC_COMP_BASE)
 		return -ENOSPC;
 
@@ -131,20 +136,15 @@ static int mlx5_enable_msix(struct mlx5_core_dev *dev)
 	for (i = 0; i < nvec; i++)
 		table->msix_arr[i].entry = i;
 
-retry:
-	table->num_comp_vectors = nvec - MLX5_EQ_VEC_COMP_BASE;
 	err = pci_enable_msix(dev->pdev, table->msix_arr, nvec);
-	if (err <= 0) {
+	if (err) {
+		kfree(table->msix_arr);
 		return err;
-	} else if (err > MLX5_EQ_VEC_COMP_BASE) {
-		nvec = err;
-		goto retry;
 	}
 
-	mlx5_core_dbg(dev, "received %d MSI vectors out of %d requested\n", err, nvec);
-	kfree(table->msix_arr);
+	table->num_comp_vectors = nvec - MLX5_EQ_VEC_COMP_BASE;
 
-	return -ENOSPC;
+	return 0;
 }
 
 static void mlx5_disable_msix(struct mlx5_core_dev *dev)
-- 
1.7.7.6

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