[dpdk-stable] [PATCH] net/failsafe: fix state synchro cleanup

[Gaetan Rivet <grive@u256.net>]

During a hotplug attempt, failsafe will try to bring a subdevice that
just appeared to its internal state. On error, the subdevice is marked
for removal and will be cleaned up.

However failsafe_dev_remove() only remove active devices. Devices that
failed during probe will be stuck in DEV_PARSED state repeatedly.

Consider all devices when doing a removal round, but limit burst control
and stats saving to active devices.

Fixes: 598fb8aec6f6 ("net/failsafe: support device removal")
Cc: stable@dpdk.org
Signed-off-by: Gaetan Rivet <grive@u256.net>
---
 drivers/net/failsafe/failsafe_ether.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/failsafe/failsafe_ether.c b/drivers/net/failsafe/failsafe_ether.c
index 2b748bd8b4..30f778dbf2 100644
--- a/drivers/net/failsafe/failsafe_ether.c
+++ b/drivers/net/failsafe/failsafe_ether.c
@@ -383,14 +383,23 @@ failsafe_dev_remove(struct rte_eth_dev *dev)
 	struct sub_device *sdev;
 	uint8_t i;
 
-	FOREACH_SUBDEV_STATE(sdev, i, dev, DEV_ACTIVE)
-		if (sdev->remove && fs_rxtx_clean(sdev)) {
-			if (fs_lock(dev, 1) != 0)
-				return;
+	FOREACH_SUBDEV(sdev, i, dev) {
+		if (!sdev->remove)
+			continue;
+
+		/* Active devices must have finished their burst and
+		 * their stats must be saved.
+		 */
+		if (sdev->state >= DEV_ACTIVE &&
+		    fs_rxtx_clean(sdev) == 0)
+			continue;
+		if (fs_lock(dev, 1) != 0)
+			return;
+		if (sdev->state >= DEV_ACTIVE)
 			fs_dev_stats_save(sdev);
-			fs_dev_remove(sdev);
-			fs_unlock(dev, 1);
-		}
+		fs_dev_remove(sdev);
+		fs_unlock(dev, 1);
+	}
 }
 
 static int
-- 
2.28.0