linux-kernel - [PATCH RFC 15/77] bnx2: Update MSI/MSI-X interrupts enablement code

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Date:	Wed,  2 Oct 2013 12:48:31 +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 15/77] bnx2: 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/broadcom/bnx2.c |   27 ++++++++++++++-------------
 1 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index e838a3f..c902627 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -6202,25 +6202,26 @@ bnx2_enable_msix(struct bnx2 *bp, int msix_vecs)
 	 *  is setup properly */
 	BNX2_RD(bp, BNX2_PCI_MSIX_CONTROL);
 
-	for (i = 0; i < BNX2_MAX_MSIX_VEC; i++) {
-		msix_ent[i].entry = i;
-		msix_ent[i].vector = 0;
-	}
-
 	total_vecs = msix_vecs;
 #ifdef BCM_CNIC
 	total_vecs++;
 #endif
-	rc = -ENOSPC;
-	while (total_vecs >= BNX2_MIN_MSIX_VEC) {
-		rc = pci_enable_msix(bp->pdev, msix_ent, total_vecs);
-		if (rc <= 0)
-			break;
-		if (rc > 0)
-			total_vecs = rc;
+	rc = pci_msix_table_size(bp->pdev);
+	if (rc < 0)
+		return;
+
+	total_vecs = min(total_vecs, rc);
+	if (total_vecs < BNX2_MIN_MSIX_VEC)
+		return;
+
+	BUG_ON(total_vecs > ARRAY_SIZE(msix_ent));
+	for (i = 0; i < total_vecs; i++) {
+		msix_ent[i].entry = i;
+		msix_ent[i].vector = 0;
 	}
 
-	if (rc != 0)
+	rc = pci_enable_msix(bp->pdev, msix_ent, total_vecs);
+	if (rc)
 		return;
 
 	msix_vecs = total_vecs;
-- 
1.7.7.6

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