netdev - [net PATCH v5 10/11] octeontx2-pf: Disable packet I/O for graceful exit

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Date: Wed, 3 May 2023 12:39:43 +0530
From: Sai Krishna <saikrishnag@...vell.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <simon.horman@...igine.com>,
        <leon@...nel.org>, <sgoutham@...vell.com>, <gakula@...vell.com>,
        <lcherian@...vell.com>, <jerinj@...vell.com>, <hkelam@...vell.com>,
        <sbhatta@...vell.com>
CC: Sai Krishna <saikrishnag@...vell.com>
Subject: [net PATCH v5 10/11] octeontx2-pf: Disable packet I/O for graceful exit

From: Subbaraya Sundeep <sbhatta@...vell.com>

At the stage of enabling packet I/O in otx2_open, If mailbox
timeout occurs then interface ends up in down state where as
hardware packet I/O is enabled. Hence disable packet I/O also
before bailing out.

Fixes: 1ea0166da050 ("octeontx2-pf: Fix the device state on error")
Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index a75c944cc739..18284ad75157 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -1835,13 +1835,22 @@ int otx2_open(struct net_device *netdev)
 		otx2_dmacflt_reinstall_flows(pf);
 
 	err = otx2_rxtx_enable(pf, true);
-	if (err)
+	/* If a mbox communication error happens at this point then interface
+	 * will end up in a state such that it is in down state but hardware
+	 * mcam entries are enabled to receive the packets. Hence disable the
+	 * packet I/O.
+	 */
+	if (err == EIO)
+		goto err_disable_rxtx;
+	else if (err)
 		goto err_tx_stop_queues;
 
 	otx2_do_set_rx_mode(pf);
 
 	return 0;
 
+err_disable_rxtx:
+	otx2_rxtx_enable(pf, false);
 err_tx_stop_queues:
 	netif_tx_stop_all_queues(netdev);
 	netif_carrier_off(netdev);
-- 
2.25.1