dma/idxd: add burst capacity

[dpdk.git] / drivers / dma / idxd / idxd_common.c

diff --git a/drivers/dma/idxd/idxd_common.c b/drivers/dma/idxd/idxd_common.c
index 5ba0b69..fc11b11 100644 (file)
--- a/drivers/dma/idxd/idxd_common.c
+++ b/drivers/dma/idxd/idxd_common.c
@@ -468,6 +468,26 @@ idxd_info_get(const struct rte_dma_dev *dev, struct rte_dma_info *info, uint32_t
        return 0;
 }
 
+uint16_t
+idxd_burst_capacity(const void *dev_private, uint16_t vchan __rte_unused)
+{
+       const struct idxd_dmadev *idxd = dev_private;
+       uint16_t write_idx = idxd->batch_start + idxd->batch_size;
+       uint16_t used_space;
+
+       /* Check for space in the batch ring */
+       if ((idxd->batch_idx_read == 0 && idxd->batch_idx_write == idxd->max_batches) ||
+                       idxd->batch_idx_write + 1 == idxd->batch_idx_read)
+               return 0;
+
+       /* For descriptors, check for wrap-around on write but not read */
+       if (idxd->ids_returned > write_idx)
+               write_idx += idxd->desc_ring_mask + 1;
+       used_space = write_idx - idxd->ids_returned;
+
+       return RTE_MIN((idxd->desc_ring_mask - used_space), idxd->max_batch_size);
+}
+
 int
 idxd_configure(struct rte_dma_dev *dev __rte_unused, const struct rte_dma_conf *dev_conf,
                uint32_t conf_sz)
@@ -553,6 +573,7 @@ idxd_dmadev_create(const char *name, struct rte_device *dev,
        dmadev->fp_obj->submit = idxd_submit;
        dmadev->fp_obj->completed = idxd_completed;
        dmadev->fp_obj->completed_status = idxd_completed_status;
+       dmadev->fp_obj->burst_capacity = idxd_burst_capacity;
 
        idxd = dmadev->data->dev_private;
        *idxd = *base_idxd; /* copy over the main fields already passed in */