[v4 13/15] dma/dpaa: add Scatter Gather support

[Gagandeep Singh]

From: Jun Yang <jun.yang at nxp.com>

Support copy_sg operation for scatter gather.

Signed-off-by: Jun Yang <jun.yang at nxp.com>
Signed-off-by: Gagandeep Singh <g.singh at nxp.com>
---
 drivers/dma/dpaa/dpaa_qdma.c | 55 ++++++++++++++++++++++++++++++++++++
 drivers/dma/dpaa/dpaa_qdma.h | 10 ++++++-
 2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dpaa/dpaa_qdma.c b/drivers/dma/dpaa/dpaa_qdma.c
index 6d8e9c8183..0aa3575fe9 100644
--- a/drivers/dma/dpaa/dpaa_qdma.c
+++ b/drivers/dma/dpaa/dpaa_qdma.c
@@ -1021,6 +1021,60 @@ dpaa_qdma_enqueue(void *dev_private, uint16_t vchan,
 	return ret;
 }
 
+static int
+dpaa_qdma_copy_sg(void *dev_private,
+	uint16_t vchan,
+	const struct rte_dma_sge *src,
+	const struct rte_dma_sge *dst,
+	uint16_t nb_src, uint16_t nb_dst,
+	uint64_t flags)
+{
+	int ret;
+	uint16_t i, start, idx;
+	struct fsl_qdma_engine *fsl_qdma = dev_private;
+	struct fsl_qdma_queue *fsl_queue = fsl_qdma->chan[vchan];
+	const uint16_t *idx_addr = NULL;
+
+	if (unlikely(nb_src != nb_dst)) {
+		DPAA_QDMA_ERR("%s: nb_src(%d) != nb_dst(%d) on  queue%d",
+			__func__, nb_src, nb_dst, vchan);
+		return -EINVAL;
+	}
+
+	if ((fsl_queue->pending_num + nb_src) > FSL_QDMA_SG_MAX_ENTRY) {
+		DPAA_QDMA_ERR("Too many pending jobs on queue%d",
+			vchan);
+		return -ENOSPC;
+	}
+	start = fsl_queue->pending_start + fsl_queue->pending_num;
+	start = start & (fsl_queue->pending_max - 1);
+	idx = start;
+
+	idx_addr = DPAA_QDMA_IDXADDR_FROM_SG_FLAG(flags);
+
+	for (i = 0; i < nb_src; i++) {
+		if (unlikely(src[i].length != dst[i].length)) {
+			DPAA_QDMA_ERR("src.len(%d) != dst.len(%d)",
+				src[i].length, dst[i].length);
+			return -EINVAL;
+		}
+		idx = (start + i) & (fsl_queue->pending_max - 1);
+		fsl_queue->pending_desc[idx].src = src[i].addr;
+		fsl_queue->pending_desc[idx].dst = dst[i].addr;
+		fsl_queue->pending_desc[idx].len = dst[i].length;
+		fsl_queue->pending_desc[idx].flag = idx_addr[i];
+	}
+	fsl_queue->pending_num += nb_src;
+
+	if (!(flags & RTE_DMA_OP_FLAG_SUBMIT))
+		return idx;
+
+	ret = fsl_qdma_enqueue_desc(fsl_queue);
+	if (!ret)
+		return fsl_queue->pending_start;
+
+	return ret;
+}
 
 static uint16_t
 dpaa_qdma_dequeue_status(void *dev_private, uint16_t vchan,
@@ -1235,6 +1289,7 @@ dpaa_qdma_probe(__rte_unused struct rte_dpaa_driver *dpaa_drv,
 	dmadev->device = &dpaa_dev->device;
 	dmadev->fp_obj->dev_private = dmadev->data->dev_private;
 	dmadev->fp_obj->copy = dpaa_qdma_enqueue;
+	dmadev->fp_obj->copy_sg = dpaa_qdma_copy_sg;
 	dmadev->fp_obj->submit = dpaa_qdma_submit;
 	dmadev->fp_obj->completed = dpaa_qdma_dequeue;
 	dmadev->fp_obj->completed_status = dpaa_qdma_dequeue_status;
diff --git a/drivers/dma/dpaa/dpaa_qdma.h b/drivers/dma/dpaa/dpaa_qdma.h
index 171c093117..1e820d0207 100644
--- a/drivers/dma/dpaa/dpaa_qdma.h
+++ b/drivers/dma/dpaa/dpaa_qdma.h
@@ -24,8 +24,13 @@
 #define QDMA_STATUS_REGION_OFFSET \
 	(QDMA_CTRL_REGION_OFFSET + QDMA_CTRL_REGION_SIZE)
 #define QDMA_STATUS_REGION_SIZE 0x10000
-#define DPAA_QDMA_COPY_IDX_OFFSET 8
+
 #define DPAA_QDMA_FLAGS_INDEX RTE_BIT64(63)
+#define DPAA_QDMA_COPY_IDX_OFFSET 8
+#define DPAA_QDMA_SG_IDX_ADDR_ALIGN \
+	RTE_BIT64(DPAA_QDMA_COPY_IDX_OFFSET)
+#define DPAA_QDMA_SG_IDX_ADDR_MASK \
+	(DPAA_QDMA_SG_IDX_ADDR_ALIGN - 1)
 
 #define FSL_QDMA_DMR			0x0
 #define FSL_QDMA_DSR			0x4
@@ -194,6 +199,9 @@ struct fsl_qdma_cmpd_ft {
 	uint64_t phy_df;
 } __rte_packed;
 
+#define DPAA_QDMA_IDXADDR_FROM_SG_FLAG(flag) \
+	((void *)(uintptr_t)((flag) - ((flag) & DPAA_QDMA_SG_IDX_ADDR_MASK)))
+
 #define DPAA_QDMA_IDX_FROM_FLAG(flag) \
 	((flag) >> DPAA_QDMA_COPY_IDX_OFFSET)
 
-- 
2.25.1