linux-kernel - [PATCH RFC 42/77] lpfc: Update MSI/MSI-X interrupts enablement code

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Message-Id: <b0f0cdcc95f7899d9340214fdc1db01097bdc25f.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:48:58 +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 42/77] lpfc: 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.

Note, in case just one MSI-X vector was available the
error message "0484 PCI enable MSI-X failed 1" is
preserved to not break tools which might depend on it.

Also, not sure why in case of multiple MSI-Xs mode failed
the driver skips the single MSI-X mode and falls back to
single MSI mode.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/scsi/lpfc/lpfc_init.c |   18 +++++++++++-------
 1 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 0803b84..d83a1a3 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -8639,13 +8639,17 @@ lpfc_sli4_enable_msix(struct lpfc_hba *phba)
 
 	/* Configure MSI-X capability structure */
 	vectors = phba->cfg_fcp_io_channel;
-enable_msix_vectors:
-	rc = pci_enable_msix(phba->pcidev, phba->sli4_hba.msix_entries,
-			     vectors);
-	if (rc > 1) {
-		vectors = rc;
-		goto enable_msix_vectors;
-	} else if (rc) {
+
+	rc = pci_msix_table_size(phba->pcidev);
+	if (rc < 0)
+		goto msg_fail_out;
+
+	vectors = min(vectors, rc);
+	if (vectors > 1)
+		rc = pci_enable_msix(phba->pcidev, phba->sli4_hba.msix_entries,
+				     vectors);
+	if (rc) {
+msg_fail_out:
 		lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
 				"0484 PCI enable MSI-X failed (%d)\n", rc);
 		goto vec_fail_out;
-- 
1.7.7.6

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