Setting bridge flag BR_FLOOD_OFFLOAD only makes sense if underlying
port hardware advertises support for it. Make sure kernel checks that
condition before allowing to update the flag value.
Signed-off-by: Igor Mitsyanko <igor.mitsyanko.os@xxxxxxxxxxxxx>
---
net/bridge/br_private.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index a6d2f2b..6d2f8b1 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -50,6 +50,9 @@ enum {
/* Path to usermode spanning tree program */
#define BR_STP_PROG "/sbin/bridge-stp"
+/* Flags that can only be set if HW supports it */
+#define BR_PORT_FLAGS_HW_ONLY BR_FLOOD_OFFLOAD
+
typedef struct bridge_id bridge_id;
typedef struct mac_addr mac_addr;
typedef __u16 port_id;
@@ -1150,7 +1153,7 @@ static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
unsigned long flags,
unsigned long mask)
{
- return 0;
+ return mask & BR_PORT_FLAGS_HW_ONLY ? -EOPNOTSUPP : 0;
}
static inline void
--
2.9.5
