[dpdk-dev] [PATCH v4 1/4] librte_ethdev: Introduce a function to release HW rings

[Renata Saiakhova <Renata.Saiakhova@ekinops.com>]

Free previously allocated memzone for HW rings

Signed-off-by: Renata Saiakhova <Renata.Saiakhova@ekinops.com>
---
 lib/librte_ethdev/rte_ethdev.c           | 30 ++++++++++++++++++++++--
 lib/librte_ethdev/rte_ethdev_driver.h    | 20 ++++++++++++++++
 lib/librte_ethdev/rte_ethdev_version.map |  1 +
 3 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 72aed59a5..ec1da2006 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -4181,6 +4181,10 @@ rte_eth_dev_rx_intr_ctl_q_get_fd(uint16_t port_id, uint16_t queue_id)
 	return fd;
 }
 
+#define ETH_DMA_MZONE_NAME(_name, _port_id, _queue_id, _ring_name) \
+	snprintf(_name, sizeof(_name), "eth_p%d_q%d_%s", \
+			_port_id, _queue_id, _ring_name)
+
 const struct rte_memzone *
 rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
 			 uint16_t queue_id, size_t size, unsigned align,
@@ -4190,8 +4194,7 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
 	const struct rte_memzone *mz;
 	int rc;
 
-	rc = snprintf(z_name, sizeof(z_name), "eth_p%d_q%d_%s",
-		      dev->data->port_id, queue_id, ring_name);
+	rc = ETH_DMA_MZONE_NAME(z_name, dev->data->port_id, queue_id, ring_name);
 	if (rc >= RTE_MEMZONE_NAMESIZE) {
 		RTE_ETHDEV_LOG(ERR, "ring name too long\n");
 		rte_errno = ENAMETOOLONG;
@@ -4206,6 +4209,29 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
 			RTE_MEMZONE_IOVA_CONTIG, align);
 }
 
+int
+rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
+		uint16_t queue_id)
+{
+	char z_name[RTE_MEMZONE_NAMESIZE];
+	const struct rte_memzone *mz;
+	int rc = 0;
+
+	rc = ETH_DMA_MZONE_NAME(z_name, dev->data->port_id, queue_id, ring_name);
+	if (rc >= RTE_MEMZONE_NAMESIZE) {
+		RTE_ETHDEV_LOG(ERR, "ring name too long\n");
+		return -ENAMETOOLONG;
+	}
+
+	mz = rte_memzone_lookup(z_name);
+	if (mz)
+		rc = rte_memzone_free(mz);
+	else
+		rc = -EINVAL;
+
+	return rc;
+}
+
 int
 rte_eth_dev_create(struct rte_device *device, const char *name,
 	size_t priv_data_size,
diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
index 99d4cd6cd..462e765d1 100644
--- a/lib/librte_ethdev/rte_ethdev_driver.h
+++ b/lib/librte_ethdev/rte_ethdev_driver.h
@@ -180,6 +180,26 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev, const char *name,
 			 uint16_t queue_id, size_t size,
 			 unsigned align, int socket_id);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Free previously allocated memzone for HW rings.
+ *
+ * @param eth_dev
+ *   The *eth_dev* pointer is the address of the *rte_eth_dev* structure
+ * @param name
+ *   The name of the memory zone
+ * @param queue_id
+ *   The index of the queue to add to name
+ * @return
+ *   Negative errno value on error, 0 on success.
+ */
+__rte_experimental
+int
+rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
+		 uint16_t queue_id);
+
 /**
  * @internal
  * Atomically set the link status for the specific device.
diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
index 715505604..139a81302 100644
--- a/lib/librte_ethdev/rte_ethdev_version.map
+++ b/lib/librte_ethdev/rte_ethdev_version.map
@@ -241,4 +241,5 @@ EXPERIMENTAL {
 	__rte_ethdev_trace_rx_burst;
 	__rte_ethdev_trace_tx_burst;
 	rte_flow_get_aged_flows;
+	rte_eth_dma_zone_free;
 };
-- 
2.17.2