[dpdk-dev] [PATCH 1/2] ethdev: change xstats reset function return value to int

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Igor Romanov <igor.romanov@oktetlabs.ru>

Change rte_eth_xstats_reset() return value from void to int and
return negative errno values in case of error conditions.

Signed-off-by: Igor Romanov <igor.romanov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 app/proc-info/main.c                   | 10 +++++++++-
 app/test-pmd/config.c                  |  8 +++++++-
 doc/guides/rel_notes/deprecation.rst   |  1 -
 doc/guides/rel_notes/release_19_11.rst |  3 +++
 lib/librte_ethdev/rte_ethdev.c         |  8 ++++----
 lib/librte_ethdev/rte_ethdev.h         |  7 ++++++-
 6 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/app/proc-info/main.c b/app/proc-info/main.c
index 34eb7a7cc4..94e808dc6e 100644
--- a/app/proc-info/main.c
+++ b/app/proc-info/main.c
@@ -580,8 +580,16 @@ nic_xstats_display(uint16_t port_id)
 static void
 nic_xstats_clear(uint16_t port_id)
 {
+	int ret;
+
 	printf("\n Clearing NIC xstats for port %d\n", port_id);
-	rte_eth_xstats_reset(port_id);
+	ret = rte_eth_xstats_reset(port_id);
+	if (ret != 0) {
+		printf("\n Error clearing xstats for port %d: %s\n", port_id,
+		       strerror(-ret));
+		return;
+	}
+
 	printf("\n  NIC extended statistics for port %d cleared\n", port_id);
 }
 
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 24158e5f7d..857b6dabc9 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -273,7 +273,13 @@ nic_xstats_display(portid_t port_id)
 void
 nic_xstats_clear(portid_t port_id)
 {
-	rte_eth_xstats_reset(port_id);
+	int ret;
+
+	ret = rte_eth_xstats_reset(port_id);
+	if (ret != 0) {
+		printf("%s: Error: failed to reset xstats (port %u): %s",
+		       __func__, port_id, strerror(ret));
+	}
 }
 
 void
diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index b2e0a1fc7c..beb9cc3b65 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -92,7 +92,6 @@ Deprecation Notices
   - ``rte_eth_link_get`` and ``rte_eth_link_get_nowait``
   - ``rte_eth_dev_stop``
   - ``rte_eth_dev_close``
-  - ``rte_eth_xstats_reset``
   - ``rte_eth_macaddr_get``
   - ``rte_eth_dev_owner_delete``
 
diff --git a/doc/guides/rel_notes/release_19_11.rst b/doc/guides/rel_notes/release_19_11.rst
index 5299157df7..3f492ac20d 100644
--- a/doc/guides/rel_notes/release_19_11.rst
+++ b/doc/guides/rel_notes/release_19_11.rst
@@ -101,6 +101,9 @@ API Changes
   ``rte_eth_promiscuous_disable`` return value from ``void`` to ``int`` to
   provide a way to report various error conditions.
 
+* ethdev: changed ``rte_eth_dev_xstats_reset`` return value from ``void`` to
+  ``int`` to provide a way to report various error conditions.
+
 
 ABI Changes
 -----------
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 98fe533c5a..b843bbc208 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -2518,22 +2518,22 @@ rte_eth_xstats_get(uint16_t port_id, struct rte_eth_xstat *xstats,
 }
 
 /* reset ethdev extended statistics */
-void
+int
 rte_eth_xstats_reset(uint16_t port_id)
 {
 	struct rte_eth_dev *dev;
 
-	RTE_ETH_VALID_PORTID_OR_RET(port_id);
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 	dev = &rte_eth_devices[port_id];
 
 	/* implemented by the driver */
 	if (dev->dev_ops->xstats_reset != NULL) {
 		(*dev->dev_ops->xstats_reset)(dev);
-		return;
+		return 0;
 	}
 
 	/* fallback to default */
-	rte_eth_stats_reset(port_id);
+	return rte_eth_stats_reset(port_id);
 }
 
 static int
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index f07a829b29..328503d1be 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -2284,8 +2284,13 @@ int rte_eth_xstats_get_id_by_name(uint16_t port_id, const char *xstat_name,
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
+ * @return
+ *   - (0) if device notified to reset extended stats.
+ *   - (-ENOTSUP) if pmd doesn't support both
+ *     extended stats and basic stats reset.
+ *   - (-ENODEV) if *port_id* invalid.
  */
-void rte_eth_xstats_reset(uint16_t port_id);
+int rte_eth_xstats_reset(uint16_t port_id);
 
 /**
  *  Set a mapping for the specified transmit queue to the specified per-queue
-- 
2.17.1