Allow independent control over rx enablement via the rx_enabled option
without affecting tx enablement. This affects the normal enabled
option since a port is only considered enabled if both tx and rx are
enabled.

If this option is not used, then the enabled option will continue to
behave exactly as it did before.

Tested in a follow-up patch with a new selftest.

Signed-off-by: Marc Harvey <marcharvey@google.com>
---
Changes in v4:
- New patch: split from the original monolithic v3 patch "net: team:
  Decouple rx and tx enablement in the team driver".
- Link to v3: https://lore.kernel.org/netdev/20260402-teaming-driver-internal-v3-6-e8cfdec3b5c2@google.com/
---
 drivers/net/team/team_core.c | 49 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index 0f95f2f04d27..78c10111329f 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -941,6 +941,28 @@ static void __team_port_disable_rx(struct team *team,
 	WRITE_ONCE(port->rx_enabled, false);
 }
 
+static void team_port_enable_rx(struct team *team,
+				struct team_port *port)
+{
+	if (team_port_rx_enabled(port))
+		return;
+
+	__team_port_enable_rx(team, port);
+	team_adjust_ops(team);
+	team_notify_peers(team);
+	team_mcast_rejoin(team);
+}
+
+static void team_port_disable_rx(struct team *team,
+				 struct team_port *port)
+{
+	if (!team_port_rx_enabled(port))
+		return;
+
+	__team_port_disable_rx(team, port);
+	team_adjust_ops(team);
+}
+
 /*
  * Enable just TX on the port by adding to tx-enabled port hashlist and
  * setting port->tx_index (Might be racy so reader could see incorrect
@@ -1488,6 +1510,26 @@ static int team_port_en_option_set(struct team *team,
 	return 0;
 }
 
+static void team_port_rx_en_option_get(struct team *team,
+				       struct team_gsetter_ctx *ctx)
+{
+	struct team_port *port = ctx->info->port;
+
+	ctx->data.bool_val = team_port_rx_enabled(port);
+}
+
+static int team_port_rx_en_option_set(struct team *team,
+				      struct team_gsetter_ctx *ctx)
+{
+	struct team_port *port = ctx->info->port;
+
+	if (ctx->data.bool_val)
+		team_port_enable_rx(team, port);
+	else
+		team_port_disable_rx(team, port);
+	return 0;
+}
+
 static void team_user_linkup_option_get(struct team *team,
 					struct team_gsetter_ctx *ctx)
 {
@@ -1609,6 +1651,13 @@ static const struct team_option team_options[] = {
 		.getter = team_port_en_option_get,
 		.setter = team_port_en_option_set,
 	},
+	{
+		.name = "rx_enabled",
+		.type = TEAM_OPTION_TYPE_BOOL,
+		.per_port = true,
+		.getter = team_port_rx_en_option_get,
+		.setter = team_port_rx_en_option_set,
+	},
 	{
 		.name = "user_linkup",
 		.type = TEAM_OPTION_TYPE_BOOL,

-- 
2.53.0.1185.g05d4b7b318-goog