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From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"Fu, Patrick" <patrick.fu@intel.com>,
	"amorenoz@redhat.com" <amorenoz@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v3 1/8] bus/vdev: add DMA mapping ops
Date: Wed, 30 Sep 2020 05:47:17 +0000
Message-ID: <MN2PR11MB40630676EEEBA3161FF616E69C330@MN2PR11MB4063.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20200929161404.124580-2-maxime.coquelin@redhat.com>

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Wednesday, September 30, 2020 12:14 AM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; Fu, Patrick
> <patrick.fu@intel.com>; amorenoz@redhat.com
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v3 1/8] bus/vdev: add DMA mapping ops
> 
> Add DMA map/unmap operation callbacks to the vdev bus, which
> could be used by DMA capable vdev drivers.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/bus/vdev/rte_bus_vdev.h | 46 +++++++++++++++++++++++++++--
>  drivers/bus/vdev/vdev.c         | 52 +++++++++++++++++++++++++++++++++
>  2 files changed, 95 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/bus/vdev/rte_bus_vdev.h
> b/drivers/bus/vdev/rte_bus_vdev.h
> index 78a032cea8..d14eeb41b0 100644
> --- a/drivers/bus/vdev/rte_bus_vdev.h
> +++ b/drivers/bus/vdev/rte_bus_vdev.h
> @@ -63,14 +63,54 @@ typedef int (rte_vdev_probe_t)(struct rte_vdev_device
> *dev);
>   */
>  typedef int (rte_vdev_remove_t)(struct rte_vdev_device *dev);
> 
> +/**
> + * Driver-specific DMA mapping. After a successful call the device
> + * will be able to read/write from/to this segment.
> + *
> + * @param dev
> + *   Pointer to the Virtual device.
> + * @param addr
> + *   Starting virtual address of memory to be mapped.
> + * @param iova
> + *   Starting IOVA address of memory to be mapped.
> + * @param len
> + *   Length of memory segment being mapped.
> + * @return
> + *   - 0 On success.
> + *   - Negative value and rte_errno is set otherwise.
> + */
> +typedef int (rte_vdev_dma_map_t)(struct rte_vdev_device *dev, void *addr,
> +			    uint64_t iova, size_t len);
> +
> +/**
> + * Driver-specific DMA un-mapping. After a successful call the device
> + * will not be able to read/write from/to this segment.
> + *
> + * @param dev
> + *   Pointer to the Virtual device.
> + * @param addr
> + *   Starting virtual address of memory to be unmapped.
> + * @param iova
> + *   Starting IOVA address of memory to be unmapped.
> + * @param len
> + *   Length of memory segment being unmapped.
> + * @return
> + *   - 0 On success.
> + *   - Negative value and rte_errno is set otherwise.
> + */
> +typedef int (rte_vdev_dma_unmap_t)(struct rte_vdev_device *dev, void
> *addr,
> +			      uint64_t iova, size_t len);
> +
>  /**
>   * A virtual device driver abstraction.
>   */
>  struct rte_vdev_driver {
>  	TAILQ_ENTRY(rte_vdev_driver) next; /**< Next in list. */
> -	struct rte_driver driver;      /**< Inherited general driver. */
> -	rte_vdev_probe_t *probe;       /**< Virtual device probe function.
> */
> -	rte_vdev_remove_t *remove;     /**< Virtual device remove function.
> */
> +	struct rte_driver driver;        /**< Inherited general driver. */
> +	rte_vdev_probe_t *probe;         /**< Virtual device probe function.
> */
> +	rte_vdev_remove_t *remove;       /**< Virtual device remove function.
> */
> +	rte_vdev_dma_map_t *dma_map;     /**< Virtual device DMA map
> function. */
> +	rte_vdev_dma_unmap_t *dma_unmap; /**< Virtual device DMA unmap
> function. */
>  };
> 
>  /**
> diff --git a/drivers/bus/vdev/vdev.c b/drivers/bus/vdev/vdev.c
> index d746149a2e..0e94ea9d26 100644
> --- a/drivers/bus/vdev/vdev.c
> +++ b/drivers/bus/vdev/vdev.c
> @@ -134,6 +134,56 @@ vdev_parse(const char *name, void *addr)
>  	return driver == NULL;
>  }
> 
> +static int
> +vdev_dma_map(struct rte_device *dev, void *addr, uint64_t iova, size_t
> len)
> +{
> +	struct rte_vdev_device *vdev = RTE_DEV_TO_VDEV(dev);
> +	const struct rte_vdev_driver *driver;
> +
> +	if (!vdev) {
> +		rte_errno = EINVAL;
> +		return -1;
> +	}
> +
> +	if (!vdev->device.driver) {
> +		VDEV_LOG(DEBUG, "no driver attach to device %s", dev->name);
> +		return 1;
> +	}
> +
> +	driver = container_of(vdev->device.driver, const struct
> rte_vdev_driver,
> +			driver);
> +
> +	if (driver->dma_map)
> +		return driver->dma_map(vdev, addr, iova, len);
> +
> +	return 0;
> +}
> +
> +static int
> +vdev_dma_unmap(struct rte_device *dev, void *addr, uint64_t iova, size_t
> len)
> +{
> +	struct rte_vdev_device *vdev = RTE_DEV_TO_VDEV(dev);
> +	const struct rte_vdev_driver *driver;
> +
> +	if (!vdev) {
> +		rte_errno = EINVAL;
> +		return -1;
> +	}
> +
> +	if (!vdev->device.driver) {
> +		VDEV_LOG(DEBUG, "no driver attach to device %s", dev->name);
> +		return 1;
> +	}
> +
> +	driver = container_of(vdev->device.driver, const struct
> rte_vdev_driver,
> +			driver);
> +
> +	if (driver->dma_unmap)
> +		return driver->dma_unmap(vdev, addr, iova, len);
> +
> +	return 0;
> +}
> +
>  static int
>  vdev_probe_all_drivers(struct rte_vdev_device *dev)
>  {
> @@ -551,6 +601,8 @@ static struct rte_bus rte_vdev_bus = {
>  	.plug = vdev_plug,
>  	.unplug = vdev_unplug,
>  	.parse = vdev_parse,
> +	.dma_map = vdev_dma_map,
> +	.dma_unmap = vdev_dma_unmap,
>  	.dev_iterate = rte_vdev_dev_iterate,
>  };
> 
> --
> 2.26.2

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

  reply	other threads:[~2020-09-30  5:47 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-29 16:13 [dpdk-dev] [PATCH v3 0/8] virtio-user: introduce vhost-vdpa backend Maxime Coquelin
2020-09-29 16:13 ` [dpdk-dev] [PATCH v3 1/8] bus/vdev: add DMA mapping ops Maxime Coquelin
2020-09-30  5:47   ` Xia, Chenbo [this message]
2020-09-29 16:13 ` [dpdk-dev] [PATCH v3 2/8] net/virtio: introduce DMA ops Maxime Coquelin
2020-09-30  5:47   ` Xia, Chenbo
2020-09-29 16:13 ` [dpdk-dev] [PATCH v3 3/8] net/virtio: move backend type selection to ethdev Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-10-16  5:42   ` Wang, Yinan
2020-10-16  5:58     ` Wang, Yinan
2020-10-20  1:52     ` Wang, Yinan
2020-10-20  7:11       ` Maxime Coquelin
2020-10-20  7:20         ` Adrian Moreno
2020-09-29 16:14 ` [dpdk-dev] [PATCH v3 4/8] net/virtio: introduce Vhost-vDPA backend type Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-09-29 16:14 ` [dpdk-dev] [PATCH v3 5/8] net/virtio: check protocol feature in user backend Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-09-29 16:14 ` [dpdk-dev] [PATCH v3 6/8] net/virtio: adapt Virtio-user status size Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-09-29 16:14 ` [dpdk-dev] [PATCH v3 7/8] net/virtio: split virtio-user start Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-09-29 16:14 ` [dpdk-dev] [PATCH v3 8/8] net/virtio: introduce Vhost-vDPA backend Maxime Coquelin
2020-09-30  5:49   ` Xia, Chenbo
2020-09-30 16:22 ` [dpdk-dev] [PATCH v3 0/8] virtio-user: introduce vhost-vdpa backend Maxime Coquelin

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