Commit a2dc179481d1 for kernel

commit a2dc179481d18f6df7274522571b64dd50f31e81
Author: MD Danish Anwar <danishanwar@ti.com>
Date:   Tue Sep 8 14:38:56 2026 +0530

    net: hsr: enable promiscuous mode on interlink port with fwd offload

    hsr_portdev_setup() skips promiscuous mode on non-master ports when
    hsr->fwd_offloaded is set. fwd_offloaded is derived only from the ring
    slaves' NETIF_F_HW_HSR_FWD bit, so this also skips it for the interlink
    port, which never gets forwarding offload. Without promiscuous mode,
    the interlink NIC drops unicast frames addressed to hsr_dev's MAC
    (e.g. SAN traffic to the RedBox), breaking RedBox whenever the ring is
    HW-offloaded.

    Fixes: 5055cccfc2d1 ("net: hsr: Provide RedBox support (HSR-SAN)")
    Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Reviewed-by: Fernando Fernandez Mancera <fmancera@suse.de>
    Link: https://patch.msgid.link/20260908090856.2876114-1-danishanwar@ti.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
index 01c73b4b50dd..a546f70f9cc8 100644
--- a/net/hsr/hsr_slave.c
+++ b/net/hsr/hsr_slave.c
@@ -149,9 +149,12 @@ static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
 	int res;

 	/* Don't use promiscuous mode for offload since L2 frame forward
-	 * happens at the offloaded hardware.
+	 * happens at the offloaded hardware. The interlink port never
+	 * gets forwarding offload (RedBox forwarding to/from it is done
+	 * by this driver), so it still needs promiscuous mode to receive
+	 * frames addressed to hsr_dev's MAC rather than its own.
 	 */
-	if (!port->hsr->fwd_offloaded) {
+	if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK) {
 		res = dev_set_promiscuity(dev, 1);
 		if (res)
 			return res;
@@ -176,7 +179,7 @@ static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
 fail_rx_handler:
 	netdev_upper_dev_unlink(dev, hsr_dev);
 fail_upper_dev_link:
-	if (!port->hsr->fwd_offloaded)
+	if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK)
 		dev_set_promiscuity(dev, -1);

 	return res;
@@ -240,7 +243,7 @@ void hsr_del_port(struct hsr_port *port)
 		netdev_update_features(master->dev);
 		dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
 		netdev_rx_handler_unregister(port->dev);
-		if (!port->hsr->fwd_offloaded)
+		if (!port->hsr->fwd_offloaded || port->type == HSR_PT_INTERLINK)
 			dev_set_promiscuity(port->dev, -1);
 		if (port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B)
 			vlan_vids_del_by_dev(port->dev, master->dev);