[PATCH v2 net-next] net: hsr: Disable promiscuous mode in offload mode

[Ravi Gunasekaran]

When port-to-port forwarding for interfaces in HSR node is enabled,
disable promiscuous mode since L2 frame forward happens at the
offloaded hardware.

Signed-off-by: Ravi Gunasekaran <r-gunasekaran@xxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
---
Changes from v1:
===============
* Changed the data type of "fwd_offloaded" from "unsigned int" to "bool"
  and moved it below "net_id" struct member as per Paolo's comment.
* Collected Reviewed-by tag from v1 patch.

v1: https://lore.kernel.org/all/20230612093933.13267-1-r-gunasekaran@xxxxxx/

 net/hsr/hsr_device.c |  5 +++++
 net/hsr/hsr_main.h   |  1 +
 net/hsr/hsr_slave.c  | 15 +++++++++++----
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index 5a236aae2366..306f942c3b28 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -531,6 +531,11 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
 	if (res)
 		goto err_add_master;
 
+	/* HSR forwarding offload supported in lower device? */
+	if ((slave[0]->features & NETIF_F_HW_HSR_FWD) &&
+	    (slave[1]->features & NETIF_F_HW_HSR_FWD))
+		hsr->fwd_offloaded = true;
+
 	res = register_netdevice(hsr_dev);
 	if (res)
 		goto err_unregister;
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 5584c80a5c79..6851e33df7d1 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -208,6 +208,7 @@ struct hsr_priv {
 	u8 net_id;		/* for PRP, it occupies most significant 3 bits
 				 * of lan_id
 				 */
+	bool fwd_offloaded;	/* Forwarding offloaded to HW */
 	unsigned char		sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
 				/* Align to u16 boundary to avoid unaligned access
 				 * in ether_addr_equal
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
index b70e6bbf6021..e5742f2a2d52 100644
--- a/net/hsr/hsr_slave.c
+++ b/net/hsr/hsr_slave.c
@@ -131,9 +131,14 @@ static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
 	struct hsr_port *master;
 	int res;
 
-	res = dev_set_promiscuity(dev, 1);
-	if (res)
-		return res;
+	/* Don't use promiscuous mode for offload since L2 frame forward
+	 * happens at the offloaded hardware.
+	 */
+	if (!port->hsr->fwd_offloaded) {
+		res = dev_set_promiscuity(dev, 1);
+		if (res)
+			return res;
+	}
 
 	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
 	hsr_dev = master->dev;
@@ -152,7 +157,9 @@ 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:
-	dev_set_promiscuity(dev, -1);
+	if (!port->hsr->fwd_offloaded)
+		dev_set_promiscuity(dev, -1);
+
 	return res;
 }
 
-- 
2.17.1