linux-kernel - Re: [PATCH net-next 4/4] vmxnet3: update to version 9

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Date: Wed, 15 May 2024 11:49:16 +0100
From: Simon Horman <horms@...nel.org>
To: Ronak Doshi <ronak.doshi@...adcom.com>
Cc: netdev@...r.kernel.org,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 4/4] vmxnet3: update to version 9

On Tue, May 14, 2024 at 11:20:49AM -0700, Ronak Doshi wrote:
> With all vmxnet3 version 9 changes incorporated in the vmxnet3 driver,
> the driver can configure emulation to run at vmxnet3 version 9, provided
> the emulation advertises support for version 9.
> 
> Signed-off-by: Ronak Doshi <ronak.doshi@...adcom.com>
> Acked-by: Guolin Yang <guolin.yang@...adcom.com>

..

> @@ -4019,42 +4019,14 @@ vmxnet3_probe_device(struct pci_dev *pdev,
>  		goto err_alloc_pci;
>  
>  	ver = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_VRRS);
> -	if (ver & (1 << VMXNET3_REV_7)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_7);
> -		adapter->version = VMXNET3_REV_7 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_6)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_6);
> -		adapter->version = VMXNET3_REV_6 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_5)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_5);
> -		adapter->version = VMXNET3_REV_5 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_4)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_4);
> -		adapter->version = VMXNET3_REV_4 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_3)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_3);
> -		adapter->version = VMXNET3_REV_3 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_2)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_2);
> -		adapter->version = VMXNET3_REV_2 + 1;
> -	} else if (ver & (1 << VMXNET3_REV_1)) {
> -		VMXNET3_WRITE_BAR1_REG(adapter,
> -				       VMXNET3_REG_VRRS,
> -				       1 << VMXNET3_REV_1);
> -		adapter->version = VMXNET3_REV_1 + 1;
> -	} else {
> +	for (i = VMXNET3_REV_9; i >= VMXNET3_REV_1; i--) {
> +		if (ver & (1 << i)) {
> +			VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_VRRS, 1 << i);

nit: Please consider using the BIT() macro.

> +			adapter->version = i + 1;
> +			break;
> +		}
> +	}
> +	if (i < VMXNET3_REV_1) {
>  		dev_err(&pdev->dev,
>  			"Incompatible h/w version (0x%x) for adapter\n", ver);
>  		err = -EBUSY;