[dpdk-dev] [PATCH v4 1/2] ethdev: add return code to rte_eth_stats_reset()

[David Harton <dharton@cisco.com>]

Some devices do not support reset of eth stats.  An application may
need to know not to clear shadow stats if the device cannot.

rte_eth_stats_reset is updated to provide a return code to share
whether the device supports reset or not.

Signed-off-by: David Harton <dharton@cisco.com>
---

v4:
* commented return values

v3:
* overcame noob errors and figured out patch challenged

v2:
* fixed soft tab issue inserted while moving changes

 lib/librte_ether/rte_ethdev.c | 8 +++++---
 lib/librte_ether/rte_ethdev.h | 6 +++++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 0597641..b420391 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1341,17 +1341,19 @@ rte_eth_stats_get(uint8_t port_id, struct rte_eth_stats *stats)
 	return 0;
 }
 
-void
+int
 rte_eth_stats_reset(uint8_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];
 
-	RTE_FUNC_PTR_OR_RET(*dev->dev_ops->stats_reset);
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->stats_reset, -ENOTSUP);
 	(*dev->dev_ops->stats_reset)(dev);
 	dev->data->rx_mbuf_alloc_failed = 0;
+
+	return 0;
 }
 
 static int
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 0adf327..b14a2b5 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -2246,8 +2246,12 @@ int rte_eth_stats_get(uint8_t port_id, struct rte_eth_stats *stats);
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
+ * @return
+ *   - (0) if device notified to reset stats.
+ *   - (-ENOTSUP) if hardware doesn't support.
+ *   - (-ENODEV) if *port_id* invalid.
  */
-void rte_eth_stats_reset(uint8_t port_id);
+int rte_eth_stats_reset(uint8_t port_id);
 
 /**
  * Retrieve names of extended statistics of an Ethernet device.
-- 
2.10.3.dirty