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From:   Ioana Ciornei <ioana.ciornei@nxp.com>
To:     gregkh@linuxfoundation.org
Cc:     linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org,
        Ioana Ciornei <ioana.ciornei@nxp.com>
Subject: [PATCH 2/6] staging: dpaa2-ethsw: don't allow interfaces from different DPSWs to be bridged
Date:   Tue, 21 Jul 2020 12:19:15 +0300
Message-Id: <20200721091919.20394-3-ioana.ciornei@nxp.com>
In-Reply-To: <20200721091919.20394-1-ioana.ciornei@nxp.com>
References: <20200721091919.20394-1-ioana.ciornei@nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Error out when the user tries to bridge two switch interfaces that are
from different DPSW instances. This is not supported by the hardware and
we should reflect this into what the user is aware of.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index 557a75115da8..530e4105375c 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -1182,6 +1182,9 @@ static int port_bridge_join(struct net_device *netdev,
 {
 	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
 	struct ethsw_core *ethsw = port_priv->ethsw_data;
+	struct ethsw_port_priv *other_port_priv;
+	struct net_device *other_dev;
+	struct list_head *iter;
 	int i, err;
 
 	for (i = 0; i < ethsw->sw_attr.num_ifs; i++)
@@ -1192,6 +1195,18 @@ static int port_bridge_join(struct net_device *netdev,
 			return -EINVAL;
 		}
 
+	netdev_for_each_lower_dev(upper_dev, other_dev, iter) {
+		if (!ethsw_port_dev_check(other_dev, NULL))
+			continue;
+
+		other_port_priv = netdev_priv(other_dev);
+		if (other_port_priv->ethsw_data != port_priv->ethsw_data) {
+			netdev_err(netdev,
+				   "Interface from a different DPSW is in the bridge already!\n");
+			return -EINVAL;
+		}
+	}
+
 	/* Enable flooding */
 	err = ethsw_port_set_flood(port_priv, 1);
 	if (!err)
-- 
2.25.1