netdev - Re: [PATCH 20/34] myri10ge: Use pci_enable_msix

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Date:	Fri, 31 Jan 2014 22:24:53 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	Hyong-Youb Kim <hykim@...i.com>, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 20/34] myri10ge: Use pci_enable_msix_range()

Hello.

On 01/31/2014 06:08 PM, Alexander Gordeev wrote:

> As result of deprecation of MSI-X/MSI enablement functions
> pci_enable_msix() and pci_enable_msi_block() all drivers
> using these two interfaces need to be updated to use the
> new pci_enable_msi_range() and pci_enable_msix_range()
> interfaces.

> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> ---
>   drivers/net/ethernet/myricom/myri10ge/myri10ge.c |   32 ++++++++++-----------
>   1 files changed, 15 insertions(+), 17 deletions(-)

> diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
> index 68026f7..9f717d6 100644
> --- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
> +++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
> @@ -2329,16 +2329,14 @@ static int myri10ge_request_irq(struct myri10ge_priv *mgp)
>   	status = 0;
>   	if (myri10ge_msi) {
>   		if (mgp->num_slices > 1) {
> -			status =
> -			    pci_enable_msix(pdev, mgp->msix_vectors,
> -					    mgp->num_slices);
> -			if (status == 0) {
> -				mgp->msix_enabled = 1;
> -			} else {
> +			status = pci_enable_msix_range(pdev, mgp->msix_vectors,
> +					mgp->num_slices, mgp->num_slices);
> +			if (status < 0) {
>   				dev_err(&pdev->dev,
>   					"Error %d setting up MSI-X\n", status);
>   				return status;
>   			}
> +			mgp->msix_enabled = 1;
>   		}
>   		if (mgp->msix_enabled == 0) {
>   			status = pci_enable_msi(pdev);
> @@ -3901,23 +3899,23 @@ static void myri10ge_probe_slices(struct myri10ge_priv *mgp)
>   	}
>
>   	while (mgp->num_slices > 1) {
> -		/* make sure it is a power of two */
> -		while (!is_power_of_2(mgp->num_slices))
> -			mgp->num_slices--;
> +		mgp->num_slices = rounddown_pow_of_two(mgp->num_slices);
>   		if (mgp->num_slices == 1)
>   			goto disable_msix;
> -		status = pci_enable_msix(pdev, mgp->msix_vectors,
> -					 mgp->num_slices);
> -		if (status == 0) {
> -			pci_disable_msix(pdev);
> +		status = pci_enable_msix_range(pdev, mgp->msix_vectors,
> +					mgp->num_slices, mgp->num_slices);

    The continuation line(s) should be aligned to start right under 'pdev', 
according to the networking coding rules.

> +		if (status < 0)
> +			goto disable_msix;

    Hm, if enabling MSI failed, we don't need to disable it, right? So, 
perhaps the label should be renamed?

> +
> +		pci_disable_msix(pdev);
> +
> +		if (status == mgp->num_slices) {
>   			if (old_allocated)
>   				kfree(old_fw);
>   			return;
> -		}
> -		if (status > 0)
> +		} else {
>   			mgp->num_slices = status;
> -		else
> -			goto disable_msix;
> +		}
>   	}
>
>   disable_msix:

WBR, Sergei

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