linux-kernel - [PATCH net-next 3/7] vmxnet3: remove power of 2 limitation on the queues

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Message-ID: <20210706200312.29777-4-doshir@vmware.com>
Date:   Tue, 6 Jul 2021 13:03:07 -0700
From:   Ronak Doshi <doshir@...are.com>
To:     <netdev@...r.kernel.org>
CC:     Ronak Doshi <doshir@...are.com>,
        "maintainer:VMWARE VMXNET3 ETHERNET DRIVER" <pv-drivers@...are.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next 3/7] vmxnet3: remove power of 2 limitation on the queues

With version 6, vmxnet3 relaxes the restriction on queues to
be power of two. This is helpful in cases (Edge VM) where
vcpus are less than 8 and device requires more than 4 queues.

Signed-off-by: Ronak Doshi <doshir@...are.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index d32fa6f3ae57..41e694d13c92 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -3399,7 +3399,6 @@ 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,
@@ -3407,7 +3406,6 @@ 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));
 	if (!netdev)
@@ -3525,6 +3523,8 @@ vmxnet3_probe_device(struct pci_dev *pdev,
 		}
 	} else {
 		adapter->queuesExtEnabled = false;
+		num_rx_queues = rounddown_pow_of_two(num_rx_queues);
+		num_tx_queues = rounddown_pow_of_two(num_tx_queues);
 		adapter->num_rx_queues = min(num_rx_queues,
 					     VMXNET3_DEVICE_DEFAULT_RX_QUEUES);
 		adapter->num_tx_queues = min(num_tx_queues,
@@ -3705,7 +3705,9 @@ vmxnet3_remove_device(struct pci_dev *pdev)
 	else
 #endif
 		num_rx_queues = 1;
-	num_rx_queues = rounddown_pow_of_two(num_rx_queues);
+	if (!VMXNET3_VERSION_GE_6(adapter)) {
+		num_rx_queues = rounddown_pow_of_two(num_rx_queues);
+	}
 	if (VMXNET3_VERSION_GE_6(adapter)) {
 		spin_lock_irqsave(&adapter->cmd_lock, flags);
 		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
-- 
2.11.0