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From:   Vladimir Oltean <olteanv@gmail.com>
To:     Jakub Kicinski <kuba@kernel.org>,
        "David S. Miller" <davem@davemloft.net>
Cc:     Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        bridge@lists.linux-foundation.org, Roopa Prabhu <roopa@nvidia.com>,
        Nikolay Aleksandrov <nikolay@nvidia.com>,
        Jiri Pirko <jiri@resnulli.us>,
        Ido Schimmel <idosch@idosch.org>,
        Claudiu Manoil <claudiu.manoil@nxp.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        UNGLinuxDriver@microchip.com, Vadym Kochan <vkochan@marvell.com>,
        Taras Chornyi <tchornyi@marvell.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Ivan Vecera <ivecera@redhat.com>, linux-omap@vger.kernel.org
Subject: [PATCH net-next 1/9] net: bridge: don't print in br_switchdev_set_port_flag
Date:   Mon,  8 Feb 2021 01:21:33 +0200
Message-Id: <20210207232141.2142678-2-olteanv@gmail.com>
In-Reply-To: <20210207232141.2142678-1-olteanv@gmail.com>
References: <20210207232141.2142678-1-olteanv@gmail.com>
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From: Vladimir Oltean <vladimir.oltean@nxp.com>

Currently br_switchdev_set_port_flag has two options for error handling
and neither is good:
- The driver returns -EOPNOTSUPP in PRE_BRIDGE_FLAGS if it doesn't
  support offloading that flag, and this gets silently ignored and
  converted to an errno of 0. Nobody does this.
- The driver returns some other error code, like -EINVAL, in
  PRE_BRIDGE_FLAGS, and br_switchdev_set_port_flag shouts loudly.

The problem is that we'd like to offload some port flags during bridge
join and leave, but also not have the bridge shout at us if those fail.
But on the other hand we'd like the user to know that we can't offload
something when they set that through netlink. And since we can't have
the driver return -EOPNOTSUPP or -EINVAL depending on whether it's
called by the user or internally by the bridge, let's just add an extack
argument to br_switchdev_set_port_flag and propagate it to its callers.
Then, when we need offloading to really fail silently, this can simply
be passed a NULL argument.

This is just a temporary patch because it's rather noisy. We'll
propagate the extack through the switchdev notifier next.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 net/bridge/br_netlink.c   | 53 +++++++++++++++++++++++++--------------
 net/bridge/br_private.h   |  6 +++--
 net/bridge/br_switchdev.c |  9 +++----
 3 files changed, 42 insertions(+), 26 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index bd3962da345a..02aa95c08b77 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -854,7 +854,8 @@ static int br_set_port_state(struct net_bridge_port *p, u8 state)
 
 /* Set/clear or port flags based on attribute */
 static int br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
-			    int attrtype, unsigned long mask)
+			    int attrtype, unsigned long mask,
+			    struct netlink_ext_ack *extack)
 {
 	unsigned long flags;
 	int err;
@@ -867,7 +868,7 @@ static int br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 	else
 		flags = p->flags & ~mask;
 
-	err = br_switchdev_set_port_flag(p, flags, mask);
+	err = br_switchdev_set_port_flag(p, flags, mask, extack);
 	if (err)
 		return err;
 
@@ -876,58 +877,71 @@ static int br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 }
 
 /* Process bridge protocol info on port */
-static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
+static int br_setport(struct net_bridge_port *p, struct nlattr *tb[],
+		      struct netlink_ext_ack *extack)
 {
 	unsigned long old_flags = p->flags;
 	bool br_vlan_tunnel_old = false;
 	int err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE,
+			       BR_MULTICAST_FAST_LEAVE, extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST, BR_MULTICAST_TO_UNICAST);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST,
+			       BR_MULTICAST_TO_UNICAST, extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD,
+			       BR_BCAST_FLOOD, extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP,
+			       extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI,
+			       BR_PROXYARP_WIFI, extack);
 	if (err)
 		return err;
 
 	br_vlan_tunnel_old = (p->flags & BR_VLAN_TUNNEL) ? true : false;
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL,
+			       extack);
 	if (err)
 		return err;
 
@@ -983,11 +997,12 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 	}
 
 	err = br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS,
-			       BR_NEIGH_SUPPRESS);
+			       BR_NEIGH_SUPPRESS, extack);
 	if (err)
 		return err;
 
-	err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED,
+			       extack);
 	if (err)
 		return err;
 
@@ -1046,7 +1061,7 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
 				return err;
 
 			spin_lock_bh(&p->br->lock);
-			err = br_setport(p, tb);
+			err = br_setport(p, tb, extack);
 			spin_unlock_bh(&p->br->lock);
 		} else {
 			/* Binary compatibility with old RSTP */
@@ -1141,7 +1156,7 @@ static int br_port_slave_changelink(struct net_device *brdev,
 		return 0;
 
 	spin_lock_bh(&br->lock);
-	ret = br_setport(br_port_get_rtnl(dev), data);
+	ret = br_setport(br_port_get_rtnl(dev), data, extack);
 	spin_unlock_bh(&br->lock);
 
 	return ret;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index d242ba668e47..a1639d41188b 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1575,7 +1575,8 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 				  const struct sk_buff *skb);
 int br_switchdev_set_port_flag(struct net_bridge_port *p,
 			       unsigned long flags,
-			       unsigned long mask);
+			       unsigned long mask,
+			       struct netlink_ext_ack *extack);
 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
 			     int type);
 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
@@ -1605,7 +1606,8 @@ static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 
 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
 					     unsigned long flags,
-					     unsigned long mask)
+					     unsigned long mask,
+					     struct netlink_ext_ack *extack)
 {
 	return 0;
 }
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index a9c23ef83443..c18e1d600dc6 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -60,7 +60,8 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 
 int br_switchdev_set_port_flag(struct net_bridge_port *p,
 			       unsigned long flags,
-			       unsigned long mask)
+			       unsigned long mask,
+			       struct netlink_ext_ack *extack)
 {
 	struct switchdev_attr attr = {
 		.orig_dev = p->dev,
@@ -83,8 +84,7 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 		return 0;
 
 	if (err) {
-		br_warn(p->br, "bridge flag offload is not supported %u(%s)\n",
-			(unsigned int)p->port_no, p->dev->name);
+		NL_SET_ERR_MSG_MOD(extack, "bridge flag offload is not supported");
 		return -EOPNOTSUPP;
 	}
 
@@ -94,8 +94,7 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 
 	err = switchdev_port_attr_set(p->dev, &attr);
 	if (err) {
-		br_warn(p->br, "error setting offload flag on port %u(%s)\n",
-			(unsigned int)p->port_no, p->dev->name);
+		NL_SET_ERR_MSG_MOD(extack, "error setting offload flag on port");
 		return err;
 	}
 
-- 
2.25.1