netdev - Re: [PATCH V2 mlx5-next 06/14] vdpa/mlx5: Use mlx5_vf_get_core

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Date:   Tue, 19 Oct 2021 14:16:29 +0300
From:   Max Gurtovoy <mgurtovoy@...dia.com>
To:     Yishai Hadas <yishaih@...dia.com>, <alex.williamson@...hat.com>,
        <bhelgaas@...gle.com>, <jgg@...dia.com>, <saeedm@...dia.com>
CC:     <linux-pci@...r.kernel.org>, <kvm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <kuba@...nel.org>, <leonro@...dia.com>,
        <kwankhede@...dia.com>, <maorg@...dia.com>
Subject: Re: [PATCH V2 mlx5-next 06/14] vdpa/mlx5: Use mlx5_vf_get_core_dev()
 to get PF device


On 10/19/2021 1:58 PM, Yishai Hadas wrote:
> Use mlx5_vf_get_core_dev() to get PF device instead of accessing
> directly the PF data structure from the VF one.
>
> The mlx5_vf_get_core_dev() API in its turn uses the generic PCI API
> (i.e. pci_iov_get_pf_drvdata) to get it.
>
> Signed-off-by: Yishai Hadas <yishaih@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>   drivers/vdpa/mlx5/net/mlx5_vnet.c | 27 +++++++++++++++++++++------
>   1 file changed, 21 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 5c7d2a953dbd..97b8917bc34d 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1445,7 +1445,10 @@ static virtio_net_ctrl_ack handle_ctrl_mac(struct mlx5_vdpa_dev *mvdev, u8 cmd)
>   	size_t read;
>   	u8 mac[ETH_ALEN];
>   
> -	pfmdev = pci_get_drvdata(pci_physfn(mvdev->mdev->pdev));
> +	pfmdev = mlx5_vf_get_core_dev(mvdev->mdev->pdev);
> +	if (!pfmdev)
> +		return status;
> +
>   	switch (cmd) {

Yishai/Jason,

I think this patch breaks VPDA over SF.

Did you verify it ?

-Max.