netdev - [PATCH RFC 69/77] tg3: Update MSI/MSI-X interrupts enablement code

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Message-Id: <7439a70d0bb225702097714d92df2169ffd94dd6.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:25 +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 69/77] tg3: 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/tg3.c |   24 +++++++++++++-----------
 1 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 12d961c..2e842ef3 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -11241,6 +11241,10 @@ static bool tg3_enable_msix(struct tg3 *tp)
 	int i, rc;
 	struct msix_entry msix_ent[TG3_IRQ_MAX_VECS];
 
+	rc = pci_msix_table_size(tp->pdev);
+	if (rc < 0)
+		return false;
+
 	tp->txq_cnt = tp->txq_req;
 	tp->rxq_cnt = tp->rxq_req;
 	if (!tp->rxq_cnt)
@@ -11256,6 +11260,14 @@ static bool tg3_enable_msix(struct tg3 *tp)
 		tp->txq_cnt = 1;
 
 	tp->irq_cnt = tg3_irq_count(tp);
+	if (tp->irq_cnt > rc) {
+		netdev_notice(tp->dev, "Requested %d MSI-Xs, available %d\n",
+			      tp->irq_cnt, rc);
+		tp->irq_cnt = rc;
+		tp->rxq_cnt = max(rc - 1, 1);
+		if (tp->txq_cnt)
+			tp->txq_cnt = min(tp->rxq_cnt, tp->txq_max);
+	}
 
 	for (i = 0; i < tp->irq_max; i++) {
 		msix_ent[i].entry  = i;
@@ -11263,18 +11275,8 @@ static bool tg3_enable_msix(struct tg3 *tp)
 	}
 
 	rc = pci_enable_msix(tp->pdev, msix_ent, tp->irq_cnt);
-	if (rc < 0) {
+	if (rc)
 		return false;
-	} else if (rc != 0) {
-		if (pci_enable_msix(tp->pdev, msix_ent, rc))
-			return false;
-		netdev_notice(tp->dev, "Requested %d MSI-X vectors, received %d\n",
-			      tp->irq_cnt, rc);
-		tp->irq_cnt = rc;
-		tp->rxq_cnt = max(rc - 1, 1);
-		if (tp->txq_cnt)
-			tp->txq_cnt = min(tp->rxq_cnt, tp->txq_max);
-	}
 
 	for (i = 0; i < tp->irq_max; i++)
 		tp->napi[i].irq_vec = msix_ent[i].vector;
-- 
1.7.7.6

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