[dpdk-dev] [PATCH] net/failsafe: improve stats accuracy

[Matan Azrad <matan@mellanox.com>]

The stats_get API was changed to return error in case of failure at
stats getting process time.
By this way, failsafe can get stats snapshot in removal process for
each PMD which can give stats after removal event.

This patch implements ultimate stats snapshot on removal time by
trying to get the removed device stats before calling to dev_close.

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/failsafe/failsafe_ether.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/failsafe/failsafe_ether.c b/drivers/net/failsafe/failsafe_ether.c
index f4db423..2758d4c 100644
--- a/drivers/net/failsafe/failsafe_ether.c
+++ b/drivers/net/failsafe/failsafe_ether.c
@@ -312,8 +312,12 @@
 static void
 fs_dev_stats_save(struct sub_device *sdev)
 {
+	struct rte_eth_stats stats;
+
+	/* Get stats now or take it from last snapshot. */
 	failsafe_stats_increment(&PRIV(sdev->fs_dev)->stats_accumulator,
-			&sdev->stats_snapshot);
+		rte_eth_stats_get(PORT_ID(sdev), &stats) ?
+		&sdev->stats_snapshot : &stats);
 	memset(&sdev->stats_snapshot, 0, sizeof(struct rte_eth_stats));
 }
 
-- 
1.8.3.1