netdev - [PATCH v5 net-next 10/15] net: dsa: install the host MDB and FDB entries in the master's RX filter

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Date:   Tue, 29 Jun 2021 17:06:53 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        bridge@...ts.linux-foundation.org,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH v5 net-next 10/15] net: dsa: install the host MDB and FDB entries in the master's RX filter

From: Vladimir Oltean <vladimir.oltean@....com>

If the DSA master implements strict address filtering, then the unicast
and multicast addresses kept by the DSA CPU ports should be synchronized
with the address lists of the DSA master.

Note that we want the synchronization of the master's address lists even
if the DSA switch doesn't support unicast/multicast database operations,
on the premises that the packets will be flooded to the CPU in that
case, and we should still instruct the master to receive them. This is
why we do the dev_uc_add() etc first, even if dsa_port_notify() returns
-EOPNOTSUPP. In turn, dev_uc_add() and friends return error only if
memory allocation fails, so it is probably ok to check and propagate
that error code and not just ignore it.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v4->v5: do the dev_uc_add before the dsa_port_notify, as was correctly
        hinted by the commit message but not implemented this way
        previously

 net/dsa/port.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 1b80e0fbdfaa..778b0dc2bb39 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -655,6 +655,12 @@ int dsa_port_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 		.addr = addr,
 		.vid = vid,
 	};
+	struct dsa_port *cpu_dp = dp->cpu_dp;
+	int err;
+
+	err = dev_uc_add(cpu_dp->master, addr);
+	if (err)
+		return err;
 
 	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_ADD, &info);
 }
@@ -668,6 +674,12 @@ int dsa_port_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 		.addr = addr,
 		.vid = vid,
 	};
+	struct dsa_port *cpu_dp = dp->cpu_dp;
+	int err;
+
+	err = dev_uc_del(cpu_dp->master, addr);
+	if (err)
+		return err;
 
 	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_DEL, &info);
 }
@@ -715,6 +727,12 @@ int dsa_port_host_mdb_add(const struct dsa_port *dp,
 		.port = dp->index,
 		.mdb = mdb,
 	};
+	struct dsa_port *cpu_dp = dp->cpu_dp;
+	int err;
+
+	err = dev_mc_add(cpu_dp->master, mdb->addr);
+	if (err)
+		return err;
 
 	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_ADD, &info);
 }
@@ -727,6 +745,12 @@ int dsa_port_host_mdb_del(const struct dsa_port *dp,
 		.port = dp->index,
 		.mdb = mdb,
 	};
+	struct dsa_port *cpu_dp = dp->cpu_dp;
+	int err;
+
+	err = dev_mc_del(cpu_dp->master, mdb->addr);
+	if (err)
+		return err;
 
 	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_MDB_DEL, &info);
 }
-- 
2.25.1