netdev - Re: [PATCH v9 21/32] virtio_pci: queue_reset: update struct virtio_pci_common

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Date:   Tue, 12 Apr 2022 14:43:08 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v9 21/32] virtio_pci: queue_reset: update struct
 virtio_pci_common_cfg and option functions


在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> Add queue_reset in virtio_pci_common_cfg, and add related operation
> functions.
>
> For not breaks uABI, add a new struct virtio_pci_common_cfg_reset.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   drivers/virtio/virtio_pci_modern_dev.c | 36 ++++++++++++++++++++++++++
>   include/linux/virtio_pci_modern.h      |  2 ++
>   include/uapi/linux/virtio_pci.h        |  7 +++++
>   3 files changed, 45 insertions(+)
>
> diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c
> index e8b3ff2b9fbc..8c74b00bc511 100644
> --- a/drivers/virtio/virtio_pci_modern_dev.c
> +++ b/drivers/virtio/virtio_pci_modern_dev.c
> @@ -3,6 +3,7 @@
>   #include <linux/virtio_pci_modern.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
> +#include <linux/delay.h>
>   
>   /*
>    * vp_modern_map_capability - map a part of virtio pci capability
> @@ -463,6 +464,41 @@ void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
>   }
>   EXPORT_SYMBOL_GPL(vp_modern_set_status);
>   
> +/*
> + * vp_modern_get_queue_reset - get the queue reset status
> + * @mdev: the modern virtio-pci device
> + * @index: queue index
> + */
> +int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
> +{
> +	struct virtio_pci_common_cfg_reset __iomem *cfg;
> +
> +	cfg = (struct virtio_pci_common_cfg_reset __iomem *)mdev->common;
> +
> +	vp_iowrite16(index, &cfg->cfg.queue_select);
> +	return vp_ioread16(&cfg->queue_reset);
> +}
> +EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset);
> +
> +/*
> + * vp_modern_set_queue_reset - reset the queue
> + * @mdev: the modern virtio-pci device
> + * @index: queue index
> + */
> +void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
> +{
> +	struct virtio_pci_common_cfg_reset __iomem *cfg;
> +
> +	cfg = (struct virtio_pci_common_cfg_reset __iomem *)mdev->common;
> +
> +	vp_iowrite16(index, &cfg->cfg.queue_select);
> +	vp_iowrite16(1, &cfg->queue_reset);
> +
> +	while (vp_ioread16(&cfg->queue_reset) != 1)
> +		msleep(1);
> +}
> +EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset);
> +
>   /*
>    * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
>    * @mdev: the modern virtio-pci device
> diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
> index eb2bd9b4077d..cc4154dd7b28 100644
> --- a/include/linux/virtio_pci_modern.h
> +++ b/include/linux/virtio_pci_modern.h
> @@ -106,4 +106,6 @@ void __iomem * vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
>   				       u16 index, resource_size_t *pa);
>   int vp_modern_probe(struct virtio_pci_modern_device *mdev);
>   void vp_modern_remove(struct virtio_pci_modern_device *mdev);
> +int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
> +void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
>   #endif
> diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> index 22bec9bd0dfc..d9462efd6ce8 100644
> --- a/include/uapi/linux/virtio_pci.h
> +++ b/include/uapi/linux/virtio_pci.h
> @@ -173,6 +173,13 @@ struct virtio_pci_common_cfg_notify {
>   	__le16 padding;
>   };
>   
> +struct virtio_pci_common_cfg_reset {
> +	struct virtio_pci_common_cfg cfg;
> +
> +	__le16 queue_notify_data;	/* read-write */
> +	__le16 queue_reset;		/* read-write */
> +};


I prefer to use a separate patch for the uAPI change.

Other looks good.

Thanks


> +
>   /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
>   struct virtio_pci_cfg_cap {
>   	struct virtio_pci_cap cap;