linux-kernel - [PATCH] scsi: fnic: Replace DMA mask of 64 bits with 47 bits

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Message-Id: <20220513205605.81788-1-kartilak@cisco.com>
Date:   Fri, 13 May 2022 13:56:05 -0700
From:   Karan Tilak Kumar <kartilak@...co.com>
To:     sebaddel@...co.com
Cc:     arulponn@...co.com, djhawar@...co.com, gcboffa@...co.com,
        satishkh@...co.com, gvaradar@...co.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Karan Tilak Kumar <kartilak@...co.com>
Subject: [PATCH] scsi: fnic: Replace DMA mask of 64 bits with 47 bits

Cisco VIC supports only 47 bits.
If the host sends DMA addresses that are greater than 47
bits, it causes work queue (WQ) errors in the VIC.

Co-developed-by: Dhanraj Jhawar <djhawar@...co.com>
Signed-off-by: Dhanraj Jhawar <djhawar@...co.com>
Co-developed-by: Sesidhar Baddela <sebaddel@...co.com>
Signed-off-by: Sesidhar Baddela <sebaddel@...co.com>
Signed-off-by: Arulprabhu Ponnusamy <arulponn@...co.com>
Tested-by: Karan Tilak Kumar <kartilak@...co.com>
Signed-off-by: Karan Tilak Kumar <kartilak@...co.com>
---
 drivers/scsi/fnic/fnic.h      | 2 +-
 drivers/scsi/fnic/fnic_main.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index aa07189fb5fb..85ec6163ddab 100644
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -39,7 +39,7 @@
 
 #define DRV_NAME		"fnic"
 #define DRV_DESCRIPTION		"Cisco FCoE HBA Driver"
-#define DRV_VERSION		"1.6.0.53"
+#define DRV_VERSION		"1.6.0.54"
 #define PFX			DRV_NAME ": "
 #define DFX                     DRV_NAME "%d: "
 
diff --git a/drivers/scsi/fnic/fnic_main.c b/drivers/scsi/fnic/fnic_main.c
index 460e03a55096..51e7c344ddc3 100644
--- a/drivers/scsi/fnic/fnic_main.c
+++ b/drivers/scsi/fnic/fnic_main.c
@@ -612,10 +612,10 @@ static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	pci_set_master(pdev);
 
 	/* Query PCI controller on system for DMA addressing
-	 * limitation for the device.  Try 64-bit first, and
-	 * fail to 32-bit.
+	 * limitation for the device.  Try 47-bit first, and
+	 * fail to 32-bit. Cisco VIC supports 47 bits only.
 	 */
-	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(47));
 	if (err) {
 		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 		if (err) {
-- 
2.28.0