[dpdk-dev] [PATCH v5 1/2] ethdev: add function to release HW rings

[Ferruh Yigit <ferruh.yigit@intel.com>]

From: Renata Saiakhova <renata.saiakhova@ekinops.com>

Free previously allocated memzone for HW rings

Signed-off-by: Renata Saiakhova <renata.saiakhova@ekinops.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
v5:
* Converted macro to static inline function
* Updated API return error value
---
 lib/librte_ethdev/rte_ethdev.c           | 36 ++++++++++++++++++++++--
 lib/librte_ethdev/rte_ethdev_driver.h    | 17 +++++++++++
 lib/librte_ethdev/rte_ethdev_version.map |  7 +++++
 3 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 5ff52046dc..049d0a684c 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -4200,6 +4200,14 @@ rte_eth_dev_rx_intr_ctl_q_get_fd(uint16_t port_id, uint16_t queue_id)
 	return fd;
 }
 
+static inline int
+eth_dma_mzone_name(char *name, size_t len, uint16_t port_id, uint16_t queue_id,
+		const char *ring_name)
+{
+	return snprintf(name, len, "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,
@@ -4209,8 +4217,8 @@ 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, sizeof(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;
@@ -4235,6 +4243,30 @@ 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, sizeof(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 = -ENOENT;
+
+	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 99d4cd6cd0..13fd049c0d 100644
--- a/lib/librte_ethdev/rte_ethdev_driver.h
+++ b/lib/librte_ethdev/rte_ethdev_driver.h
@@ -180,6 +180,23 @@ 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);
 
+/**
+ * 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_internal
+int
+rte_eth_dma_zone_free(const struct rte_eth_dev *eth_dev, const char *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 7155056045..664d6b86a2 100644
--- a/lib/librte_ethdev/rte_ethdev_version.map
+++ b/lib/librte_ethdev/rte_ethdev_version.map
@@ -242,3 +242,10 @@ EXPERIMENTAL {
 	__rte_ethdev_trace_tx_burst;
 	rte_flow_get_aged_flows;
 };
+
+INTERNAL {
+	global:
+
+	rte_eth_dma_zone_free;
+};
+
-- 
2.25.4