linux-kernel - [PATCH 5.4 077/100] tun: fix bonding active backup with arp monitoring

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Message-Id: <20211124115657.351198997@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:58:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 077/100] tun: fix bonding active backup with arp monitoring

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>

commit a31d27fbed5d518734cb60956303eb15089a7634 upstream.

As stated in the bonding doc, trans_start must be set manually for drivers
using NETIF_F_LLTX:
 Drivers that use NETIF_F_LLTX flag must also update
 netdev_queue->trans_start. If they do not, then the ARP monitor will
 immediately fail any slaves using that driver, and those slaves will stay
 down.

Link: https://www.kernel.org/doc/html/v5.15/networking/bonding.html#arp-monitor-operation
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/tun.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1071,6 +1071,7 @@ static netdev_tx_t tun_net_xmit(struct s
 {
 	struct tun_struct *tun = netdev_priv(dev);
 	int txq = skb->queue_mapping;
+	struct netdev_queue *queue;
 	struct tun_file *tfile;
 	int len = skb->len;
 
@@ -1117,6 +1118,10 @@ static netdev_tx_t tun_net_xmit(struct s
 	if (ptr_ring_produce(&tfile->tx_ring, skb))
 		goto drop;
 
+	/* NETIF_F_LLTX requires to do our own update of trans_start */
+	queue = netdev_get_tx_queue(dev, txq);
+	queue->trans_start = jiffies;
+
 	/* Notify and wake up reader process */
 	if (tfile->flags & TUN_FASYNC)
 		kill_fasync(&tfile->fasync, SIGIO, POLL_IN);