[PATCH v5 04/12] dma/cnxk: flag support for dma device

[Amit Prakash Shukla]

Multiple call to configure, setup queues without stopping the device
would leak the ring descriptor and hardware queue memory. This patch
adds flags support to prevent configuring without stopping the
device.

Fixes: b56f1e2dad38 ("dma/cnxk: add channel operations")
Cc: stable at dpdk.org

Signed-off-by: Amit Prakash Shukla <amitprakashs at marvell.com>
---
v2:
- Fix for bugs observed in v1.
- Squashed few commits.

v3:
- Resolved review suggestions.
- Code improvement.

v4:
- Resolved checkpatch warnings.

v5:
- Updated commit message.
- Split the commits.

 drivers/dma/cnxk/cnxk_dmadev.c | 32 +++++++++++++++++++++++++++++---
 drivers/dma/cnxk/cnxk_dmadev.h |  5 +++++
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/cnxk/cnxk_dmadev.c b/drivers/dma/cnxk/cnxk_dmadev.c
index d8bd61a048..a7279fbd3a 100644
--- a/drivers/dma/cnxk/cnxk_dmadev.c
+++ b/drivers/dma/cnxk/cnxk_dmadev.c
@@ -45,14 +45,22 @@ cnxk_dmadev_configure(struct rte_dma_dev *dev,
 	int rc = 0;
 
 	RTE_SET_USED(conf);
-	RTE_SET_USED(conf);
-	RTE_SET_USED(conf_sz);
 	RTE_SET_USED(conf_sz);
+
 	dpivf = dev->fp_obj->dev_private;
+
+	if (dpivf->flag & CNXK_DPI_DEV_CONFIG)
+		return rc;
+
 	rc = roc_dpi_configure(&dpivf->rdpi);
-	if (rc < 0)
+	if (rc < 0) {
 		plt_err("DMA configure failed err = %d", rc);
+		goto done;
+	}
 
+	dpivf->flag |= CNXK_DPI_DEV_CONFIG;
+
+done:
 	return rc;
 }
 
@@ -69,6 +77,9 @@ cnxk_dmadev_vchan_setup(struct rte_dma_dev *dev, uint16_t vchan,
 	RTE_SET_USED(vchan);
 	RTE_SET_USED(conf_sz);
 
+	if (dpivf->flag & CNXK_DPI_VCHAN_CONFIG)
+		return 0;
+
 	header->cn9k.pt = DPI_HDR_PT_ZBW_CA;
 
 	switch (conf->direction) {
@@ -109,6 +120,7 @@ cnxk_dmadev_vchan_setup(struct rte_dma_dev *dev, uint16_t vchan,
 	dpivf->conf.c_desc.head = 0;
 	dpivf->conf.c_desc.tail = 0;
 	dpivf->pending = 0;
+	dpivf->flag |= CNXK_DPI_VCHAN_CONFIG;
 
 	return 0;
 }
@@ -126,6 +138,10 @@ cn10k_dmadev_vchan_setup(struct rte_dma_dev *dev, uint16_t vchan,
 	RTE_SET_USED(vchan);
 	RTE_SET_USED(conf_sz);
 
+
+	if (dpivf->flag & CNXK_DPI_VCHAN_CONFIG)
+		return 0;
+
 	header->cn10k.pt = DPI_HDR_PT_ZBW_CA;
 
 	switch (conf->direction) {
@@ -166,6 +182,7 @@ cn10k_dmadev_vchan_setup(struct rte_dma_dev *dev, uint16_t vchan,
 	dpivf->conf.c_desc.head = 0;
 	dpivf->conf.c_desc.tail = 0;
 	dpivf->pending = 0;
+	dpivf->flag |= CNXK_DPI_VCHAN_CONFIG;
 
 	return 0;
 }
@@ -175,11 +192,16 @@ cnxk_dmadev_start(struct rte_dma_dev *dev)
 {
 	struct cnxk_dpi_vf_s *dpivf = dev->fp_obj->dev_private;
 
+	if (dpivf->flag & CNXK_DPI_DEV_START)
+		return 0;
+
 	dpivf->desc_idx = 0;
 	dpivf->pending = 0;
 	dpivf->pnum_words = 0;
 	roc_dpi_enable(&dpivf->rdpi);
 
+	dpivf->flag |= CNXK_DPI_DEV_START;
+
 	return 0;
 }
 
@@ -190,6 +212,8 @@ cnxk_dmadev_stop(struct rte_dma_dev *dev)
 
 	roc_dpi_disable(&dpivf->rdpi);
 
+	dpivf->flag &= ~CNXK_DPI_DEV_START;
+
 	return 0;
 }
 
@@ -201,6 +225,8 @@ cnxk_dmadev_close(struct rte_dma_dev *dev)
 	roc_dpi_disable(&dpivf->rdpi);
 	roc_dpi_dev_fini(&dpivf->rdpi);
 
+	dpivf->flag = 0;
+
 	return 0;
 }
 
diff --git a/drivers/dma/cnxk/cnxk_dmadev.h b/drivers/dma/cnxk/cnxk_dmadev.h
index 943e9e3013..573bcff165 100644
--- a/drivers/dma/cnxk/cnxk_dmadev.h
+++ b/drivers/dma/cnxk/cnxk_dmadev.h
@@ -16,6 +16,10 @@
  */
 #define DPI_REQ_CDATA		0xFF
 
+#define CNXK_DPI_DEV_CONFIG   (1ULL << 0)
+#define CNXK_DPI_VCHAN_CONFIG (1ULL << 1)
+#define CNXK_DPI_DEV_START    (1ULL << 2)
+
 struct cnxk_dpi_compl_s {
 	uint64_t cdata;
 	void *cb_data;
@@ -41,6 +45,7 @@ struct cnxk_dpi_vf_s {
 	uint16_t pending;
 	uint16_t pnum_words;
 	uint16_t desc_idx;
+	uint16_t flag;
 };
 
 #endif
-- 
2.25.1