netdev - [PATCH net-next 6/7] ionic: stop watchdog when in broken state

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Date:   Thu, 18 Mar 2021 17:48:09 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org
Cc:     drivers@...sando.io, Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 6/7] ionic: stop watchdog when in broken state

Up to now we've been ignoring any error return from the
queue starting in the link status check, so we fix that here.
If the driver had to reset and couldn't get things running
properly again, for example after a Tx Timeout and the FW is
not responding to commands, don't let the link watchdog try
to restart the queues.  At this point the user can try to DOWN
and UP the device to clear the errors.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 .../net/ethernet/pensando/ionic/ionic_lif.c   | 25 +++++++++++++++++--
 .../net/ethernet/pensando/ionic/ionic_lif.h   |  1 +
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 4f4ca183830b..9b3afedbc083 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -120,17 +120,31 @@ static void ionic_link_status_check(struct ionic_lif *lif)
 	if (!test_bit(IONIC_LIF_F_LINK_CHECK_REQUESTED, lif->state))
 		return;
 
+	/* Don't put carrier back up if we're in a broken state */
+	if (test_bit(IONIC_LIF_F_BROKEN, lif->state)) {
+		clear_bit(IONIC_LIF_F_LINK_CHECK_REQUESTED, lif->state);
+		return;
+	}
+
 	link_status = le16_to_cpu(lif->info->status.link_status);
 	link_up = link_status == IONIC_PORT_OPER_STATUS_UP;
 
 	if (link_up) {
+		int err = 0;
+
 		if (netdev->flags & IFF_UP && netif_running(netdev)) {
 			mutex_lock(&lif->queue_lock);
-			ionic_start_queues(lif);
+			err = ionic_start_queues(lif);
+			if (err) {
+				netdev_err(lif->netdev,
+					   "Failed to start queues: %d\n", err);
+				set_bit(IONIC_LIF_F_BROKEN, lif->state);
+				netif_carrier_off(lif->netdev);
+			}
 			mutex_unlock(&lif->queue_lock);
 		}
 
-		if (!netif_carrier_ok(netdev)) {
+		if (!err && !netif_carrier_ok(netdev)) {
 			ionic_port_identify(lif->ionic);
 			netdev_info(netdev, "Link up - %d Gbps\n",
 				    le32_to_cpu(lif->info->status.link_speed) / 1000);
@@ -1836,6 +1850,9 @@ static int ionic_start_queues(struct ionic_lif *lif)
 {
 	int err;
 
+	if (test_bit(IONIC_LIF_F_BROKEN, lif->state))
+		return -EIO;
+
 	if (test_bit(IONIC_LIF_F_FW_RESET, lif->state))
 		return -EBUSY;
 
@@ -1857,6 +1874,10 @@ static int ionic_open(struct net_device *netdev)
 	struct ionic_lif *lif = netdev_priv(netdev);
 	int err;
 
+	/* If recovering from a broken state, clear the bit and we'll try again */
+	if (test_and_clear_bit(IONIC_LIF_F_BROKEN, lif->state))
+		netdev_info(netdev, "clearing broken state\n");
+
 	err = ionic_txrx_alloc(lif);
 	if (err)
 		return err;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index 8ffda32a0a7d..be5cc89b2bd9 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -139,6 +139,7 @@ enum ionic_lif_state_flags {
 	IONIC_LIF_F_LINK_CHECK_REQUESTED,
 	IONIC_LIF_F_FW_RESET,
 	IONIC_LIF_F_SPLIT_INTR,
+	IONIC_LIF_F_BROKEN,
 	IONIC_LIF_F_TX_DIM_INTR,
 	IONIC_LIF_F_RX_DIM_INTR,
 
-- 
2.17.1