Merge branch 'mv88e6xxx-add-mab-offload-support'

Hans J. Schultz says:

====================
mv88e6xxx: Add MAB offload support

This patch-set adds MAB [1] offload support in mv88e6xxx.

Patch #1: Correct default return value for mv88e6xxx_port_bridge_flags.

Patch #2: Shorten the locked section in
          mv88e6xxx_g1_atu_prob_irq_thread_fn().

Patch #3: The MAB implementation for mv88e6xxx.

[1] https://git.kernel.org/netdev/net-next/c/4bf24ad09bc0
====================

Link: https://lore.kernel.org/r/20230108094849.1789162-1-netdev@kapio-technology.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/net/dsa/mv88e6xxx/switchdev.c b/drivers/net/dsa/mv88e6xxx/switchdev.c
new file mode 100644
index 000000000000..4c346a884fb2
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/switchdev.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * switchdev.c
+ *
+ *	Authors:
+ *	Hans J. Schultz		<netdev@kapio-technology.com>
+ *
+ */
+
+#include <net/switchdev.h>
+#include "chip.h"
+#include "global1.h"
+#include "switchdev.h"
+
+struct mv88e6xxx_fid_search_ctx {
+	u16 fid_search;
+	u16 vid_found;
+};
+
+static int __mv88e6xxx_find_vid(struct mv88e6xxx_chip *chip,
+				const struct mv88e6xxx_vtu_entry *entry,
+				void *priv)
+{
+	struct mv88e6xxx_fid_search_ctx *ctx = priv;
+
+	if (ctx->fid_search == entry->fid) {
+		ctx->vid_found = entry->vid;
+		return 1;
+	}
+
+	return 0;
+}
+
+static int mv88e6xxx_find_vid(struct mv88e6xxx_chip *chip, u16 fid, u16 *vid)
+{
+	struct mv88e6xxx_fid_search_ctx ctx;
+	int err;
+
+	ctx.fid_search = fid;
+	mv88e6xxx_reg_lock(chip);
+	err = mv88e6xxx_vtu_walk(chip, __mv88e6xxx_find_vid, &ctx);
+	mv88e6xxx_reg_unlock(chip);
+	if (err < 0)
+		return err;
+	if (err == 1)
+		*vid = ctx.vid_found;
+	else
+		return -ENOENT;
+
+	return 0;
+}
+
+int mv88e6xxx_handle_miss_violation(struct mv88e6xxx_chip *chip, int port,
+				    struct mv88e6xxx_atu_entry *entry, u16 fid)
+{
+	struct switchdev_notifier_fdb_info info = {
+		.addr = entry->mac,
+		.locked = true,
+	};
+	struct net_device *brport;
+	struct dsa_port *dp;
+	u16 vid;
+	int err;
+
+	err = mv88e6xxx_find_vid(chip, fid, &vid);
+	if (err)
+		return err;
+
+	info.vid = vid;
+	dp = dsa_to_port(chip->ds, port);
+
+	rtnl_lock();
+	brport = dsa_port_to_bridge_port(dp);
+	if (!brport) {
+		rtnl_unlock();
+		return -ENODEV;
+	}
+	err = call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
+				       brport, &info.info, NULL);
+	rtnl_unlock();
+
+	return err;
+}