linux-kernel - Re: [PATCH] eni_vdpa: alibaba: select VIRTIO_PCI

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Date:   Wed, 8 Dec 2021 14:56:15 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Jason Wang <jasowang@...hat.com>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Eli Cohen <elic@...dia.com>,
        Xie Yongji <xieyongji@...edance.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eni_vdpa: alibaba: select VIRTIO_PCI_LIB

On Fri, Dec 03, 2021 at 07:55:14PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When VIRTIO_PCI_LIB is not built-in but the alibaba driver is, the
> kernel runs into a link error:
> 
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_features':
> eni_vdpa.c:(.text+0x23f): undefined reference to `vp_legacy_set_features'
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_state':
> eni_vdpa.c:(.text+0x2fe): undefined reference to `vp_legacy_get_queue_enable'
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_address':
> eni_vdpa.c:(.text+0x376): undefined reference to `vp_legacy_set_queue_address'
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_ready':
> eni_vdpa.c:(.text+0x3b4): undefined reference to `vp_legacy_set_queue_address'
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_free_irq':
> eni_vdpa.c:(.text+0x460): undefined reference to `vp_legacy_queue_vector'
> x86_64-linux-ld: eni_vdpa.c:(.text+0x4b7): undefined reference to `vp_legacy_config_vector'
> x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_reset':
> 
> Selecting VIRTIO_PCI_LIB_LEGACY is not sufficient here since that is
> only part of the VIRTIO_PCI_LIB support.
> 
> Fixes: e85087beedca ("eni_vdpa: add vDPA driver for Alibaba ENI")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>


Confused. These are all part of
drivers/virtio/virtio_pci_legacy_dev.c

and
obj-$(CONFIG_VIRTIO_PCI_LIB_LEGACY) += virtio_pci_legacy_dev.o

what gives?


> ---
>  drivers/vdpa/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
> index 50f45d037611..04466603021f 100644
> --- a/drivers/vdpa/Kconfig
> +++ b/drivers/vdpa/Kconfig
> @@ -80,6 +80,7 @@ config VP_VDPA
>  
>  config ALIBABA_ENI_VDPA
>  	tristate "vDPA driver for Alibaba ENI"
> +	select VIRTIO_PCI_LIB
>  	select VIRTIO_PCI_LIB_LEGACY
>  	depends on PCI_MSI && X86
>  	help
> -- 
> 2.29.2