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

diff --git a/drivers/bus/vdev/rte_bus_vdev.h b/drivers/bus/vdev/rte_bus_vdev.h
index 78a032c..d14eeb4 100644 (file)
--- 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 d746149..0e94ea9 100644 (file)
--- 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,
 };