Patchwork [PATCHv2] vmxnet3: round down # of queues to power of two

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Submitter Shreyas Bhatewara
Date July 7, 2011, 1:16 a.m.
Message ID <alpine.LRH.2.00.1107061813100.3509@sbhatewara-dev1.eng.vmware.com>
Download mbox | patch
Permalink /patch/103599/
State Accepted
Delegated to: David Miller
Headers show

Comments

Shreyas Bhatewara - July 7, 2011, 1:16 a.m.
vmxnet3 device supports only power-of-two number of queues. The driver
therefore needs to check this and rounds down the number of queues to the
nearest power of two.

Signed-off-by: Yong Wang <yongwang@vmware.com>
Signed-off-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
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David Miller - July 7, 2011, 7:26 a.m.
From: Shreyas Bhatewara <sbhatewara@vmware.com>
Date: Wed, 6 Jul 2011 18:16:53 -0700 (PDT)

> 
> vmxnet3 device supports only power-of-two number of queues. The driver
> therefore needs to check this and rounds down the number of queues to the
> nearest power of two.
> 
> Signed-off-by: Yong Wang <yongwang@vmware.com>
> Signed-off-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
> Reviewed-by: Dmitry Torokhov <dtor@vmware.com>

Applied.
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Patch

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index fabcded..009277e 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2897,6 +2897,7 @@  vmxnet3_probe_device(struct pci_dev *pdev,
 	else
 #endif
 		num_rx_queues = 1;
+	num_rx_queues = rounddown_pow_of_two(num_rx_queues);
 
 	if (enable_mq)
 		num_tx_queues = min(VMXNET3_DEVICE_MAX_TX_QUEUES,
@@ -2904,6 +2905,7 @@  vmxnet3_probe_device(struct pci_dev *pdev,
 	else
 		num_tx_queues = 1;
 
+	num_tx_queues = rounddown_pow_of_two(num_tx_queues);
 	netdev = alloc_etherdev_mq(sizeof(struct vmxnet3_adapter),
 				   max(num_tx_queues, num_rx_queues));
 	printk(KERN_INFO "# of Tx queues : %d, # of Rx queues : %d\n",
@@ -3088,6 +3090,7 @@  vmxnet3_remove_device(struct pci_dev *pdev)
 	else
 #endif
 		num_rx_queues = 1;
+	num_rx_queues = rounddown_pow_of_two(num_rx_queues);
 
 	cancel_work_sync(&adapter->work);
 
diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index a9cb3fa..b18eac1 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -56,6 +56,7 @@ 
 #include <linux/if_vlan.h>
 #include <linux/if_arp.h>
 #include <linux/inetdevice.h>
+#include <linux/log2.h>
 
 #include "vmxnet3_defs.h"
 
@@ -69,10 +70,10 @@ 
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.1.14.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.1.18.0-k"
 
 /* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01010E00
+#define VMXNET3_DRIVER_VERSION_NUM      0x01011200
 
 #if defined(CONFIG_PCI_MSI)
 	/* RSS only makes sense if MSI-X is supported. */