netdev - Re: [PATCH 1/2] vDPA/ifcvf: record virtio notify base

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Message-ID: <55217869-b456-f3bc-0b5a-6beaf34c19f8@redhat.com>
Date:   Wed, 28 Apr 2021 16:39:47 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] vDPA/ifcvf: record virtio notify base


在 2021/4/28 下午4:21, Zhu Lingshan 写道:
> This commit records virtio notify base addr to implemente
> doorbell mapping feature
>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
> ---
>   drivers/vdpa/ifcvf/ifcvf_base.c | 1 +
>   drivers/vdpa/ifcvf/ifcvf_base.h | 1 +
>   2 files changed, 2 insertions(+)
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
> index 1a661ab45af5..cc61a5bfc5b1 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.c
> @@ -133,6 +133,7 @@ int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
>   					      &hw->notify_off_multiplier);
>   			hw->notify_bar = cap.bar;
>   			hw->notify_base = get_cap_addr(hw, &cap);
> +			hw->notify_pa = pci_resource_start(pdev, cap.bar) + cap.offset;


To be more generic and avoid future changes, let's use the math defined 
in the virtio spec.

You may refer how it is implemented in virtio_pci vdpa driver[1].

Thanks

[1] 
https://lore.kernel.org/virtualization/20210415073147.19331-5-jasowang@redhat.com/T/


>   			IFCVF_DBG(pdev, "hw->notify_base = %p\n",
>   				  hw->notify_base);
>   			break;
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
> index 0111bfdeb342..bcca7c1669dd 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
> @@ -98,6 +98,7 @@ struct ifcvf_hw {
>   	char config_msix_name[256];
>   	struct vdpa_callback config_cb;
>   	unsigned int config_irq;
> +	phys_addr_t  notify_pa;
>   };
>   
>   struct ifcvf_adapter {