netdev - Re: [PATCH] liquidio: Use pcie_flr() instead of reimplementing it

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Date:   Thu, 8 Aug 2019 13:48:54 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Bjorn Helgaas <bjorn.helgaas@...il.com>,
        Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] liquidio: Use pcie_flr() instead of reimplementing it

On Thu, Aug 08, 2019 at 07:57:53AM +0300, Denis Efremov wrote:
> octeon_mbox_process_cmd() directly writes the PCI_EXP_DEVCTL_BCR_FLR
> bit, which bypasses timing requirements imposed by the PCIe spec.
> This patch fixes the function to use the pcie_flr() interface instead.
> 
> Signed-off-by: Denis Efremov <efremov@...ux.com>

Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>

Thanks for doing this, Denis.  When possible it's better to use a PCI
core interface than to fiddle with PCI config space directly from a
driver.

> ---
>  drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
> index 021d99cd1665..614d07be7181 100644
> --- a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
> +++ b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
> @@ -260,9 +260,7 @@ static int octeon_mbox_process_cmd(struct octeon_mbox *mbox,
>  		dev_info(&oct->pci_dev->dev,
>  			 "got a request for FLR from VF that owns DPI ring %u\n",
>  			 mbox->q_no);
> -		pcie_capability_set_word(
> -			oct->sriov_info.dpiring_to_vfpcidev_lut[mbox->q_no],
> -			PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
> +		pcie_flr(oct->sriov_info.dpiring_to_vfpcidev_lut[mbox->q_no]);
>  		break;
>  
>  	case OCTEON_PF_CHANGED_VF_MACADDR:
> -- 
> 2.21.0
>