linux-kernel - [PATCH RFC 21/77] csiostor: Update MSI/MSI-X interrupts enablement code

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Message-Id: <a4355b8061609e4a4a28104cc5014178e4720bd0.1380703262.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:48:37 +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 21/77] csiostor: 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/scsi/csiostor/csio_isr.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/csiostor/csio_isr.c b/drivers/scsi/csiostor/csio_isr.c
index abf20ab..b8a840e 100644
--- a/drivers/scsi/csiostor/csio_isr.c
+++ b/drivers/scsi/csiostor/csio_isr.c
@@ -512,6 +512,16 @@ csio_enable_msix(struct csio_hw *hw)
 	if (hw->flags & CSIO_HWF_USING_SOFT_PARAMS || !csio_is_hw_master(hw))
 		cnt = min_t(uint8_t, hw->cfg_niq, cnt);
 
+	rv = pci_msix_table_size(hw->pdev);
+	if (rv < 0)
+		return rv;
+
+	cnt = min(cnt, rv);
+	if (cnt < min) {
+		csio_info(hw, "Not using MSI-X, remainder:%d\n", rv);
+		return -ENOSPC;
+	}
+
 	entries = kzalloc(sizeof(struct msix_entry) * cnt, GFP_KERNEL);
 	if (!entries)
 		return -ENOMEM;
@@ -521,19 +531,15 @@ csio_enable_msix(struct csio_hw *hw)
 
 	csio_dbg(hw, "FW supp #niq:%d, trying %d msix's\n", hw->cfg_niq, cnt);
 
-	while ((rv = pci_enable_msix(hw->pdev, entries, cnt)) >= min)
-		cnt = rv;
+	rv = pci_enable_msix(hw->pdev, entries, cnt);
 	if (!rv) {
 		if (cnt < (hw->num_sqsets + extra)) {
 			csio_dbg(hw, "Reducing sqsets to %d\n", cnt - extra);
 			csio_reduce_sqsets(hw, cnt - extra);
 		}
 	} else {
-		if (rv > 0)
-			csio_info(hw, "Not using MSI-X, remainder:%d\n", rv);
-
 		kfree(entries);
-		return -ENOSPC;
+		return rv;
 	}
 
 	/* Save off vectors */
-- 
1.7.7.6

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