netdev - [PATCH net-next 2/4] ionic: recover from ringsize change failure

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Message-Id: <20200725002326.41407-3-snelson@pensando.io>
Date:   Fri, 24 Jul 2020 17:23:24 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 2/4] ionic: recover from ringsize change failure

If the ringsize change fails, try restoring the previous setting.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 .../ethernet/pensando/ionic/ionic_ethtool.c   | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index e03ea9b18f95..b48f0e46584b 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -480,6 +480,8 @@ static int ionic_set_ringparam(struct net_device *netdev,
 			       struct ethtool_ringparam *ring)
 {
 	struct ionic_lif *lif = netdev_priv(netdev);
+	int tx_start, rx_start;
+	int err;
 
 	if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
 		netdev_info(netdev, "Changing jumbo or mini descriptors not supported\n");
@@ -497,7 +499,26 @@ static int ionic_set_ringparam(struct net_device *netdev,
 	    ring->rx_pending == lif->nrxq_descs)
 		return 0;
 
-	return ionic_reset_queues(lif, ionic_set_ringsize, ring);
+	tx_start = lif->ntxq_descs;
+	rx_start = lif->nrxq_descs;
+
+	err = ionic_reset_queues(lif, ionic_set_ringsize, ring);
+
+	if (err) {
+		int my_err;
+
+		netdev_warn(netdev, "Ringsize change failed, restoring ring sizes\n");
+		ring->tx_pending = tx_start;
+		ring->rx_pending = rx_start;
+		my_err = ionic_reset_queues(lif, ionic_set_ringsize, ring);
+
+		if (my_err) {
+			netdev_err(netdev, "Ringsize restore failed\n");
+			err = my_err;
+		}
+	}
+
+	return err;
 }
 
 static void ionic_get_channels(struct net_device *netdev,
-- 
2.17.1