netdev - [PATCH net 1/3] ionic: clear broken state on generation change

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Message-Id: <20220824165051.6185-2-snelson@pensando.io>
Date:   Wed, 24 Aug 2022 09:50:49 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Cc:     drivers@...sando.io, mohamed@...sando.io,
        Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net 1/3] ionic: clear broken state on generation change

There is a case found in heavy testing where a link flap happens just
before a firmware Recovery event and the driver gets stuck in the
BROKEN state.  This comes from the driver getting interrupted by a FW
generation change when coming back up from the link flap, and the call
to ionic_start_queues() in ionic_link_status_check() fails.  This can be
addressed by having the fw_up code clear the BROKEN bit if seen, rather
than waiting for a user to manually force the interface down and then
back up.

Fixes: 9e8eaf8427b6 ("ionic: stop watchdog when in broken state")
Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 1443f788ee37..d4226999547e 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2963,6 +2963,9 @@ static void ionic_lif_handle_fw_up(struct ionic_lif *lif)

 	mutex_lock(&lif->queue_lock);

+	if (test_and_clear_bit(IONIC_LIF_F_BROKEN, lif->state))
+		dev_info(ionic->dev, "FW Up: clearing broken state\n");
+
 	err = ionic_qcqs_alloc(lif);
 	if (err)
 		goto err_unlock;
-- 
2.17.1