linux-kernel - [PATCH v5 net-next 3/9] net: mscc: ocelot: add MAC table stream learn and lookup operations

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Date:   Fri, 24 Sep 2021 17:52:20 +0800
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     allan.nielsen@...rochip.com, joergen.andreasen@...rochip.com,
        UNGLinuxDriver@...rochip.com, vinicius.gomes@...el.com,
        michael.chan@...adcom.com, vishal@...lsio.com, saeedm@...lanox.com,
        jiri@...lanox.com, idosch@...lanox.com,
        alexandre.belloni@...tlin.com, kuba@...nel.org,
        xiaoliang.yang_1@....com, po.liu@....com, vladimir.oltean@....com,
        leoyang.li@....com, f.fainelli@...il.com, andrew@...n.ch,
        vivien.didelot@...il.com, claudiu.manoil@....com,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, matthias.bgg@...il.com,
        horatiu.vultur@...rochip.com
Subject: [PATCH v5 net-next 3/9] net: mscc: ocelot: add MAC table stream learn and lookup operations

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

ocelot_mact_learn_streamdata() can be used in VSC9959 to overwrite an
FDB entry with stream data. The stream data includes SFID and SSID which
can be used for PSFP and FRER set.

ocelot_mact_lookup() can be used to check if the given {DMAC, VID} FDB
entry is exist, and also can retrieve the DEST_IDX and entry type for
the FDB entry.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 50 ++++++++++++++++++++++++++++++
 include/soc/mscc/ocelot.h          |  5 +++
 2 files changed, 55 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 35006b0fb963..dc65247b91be 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -114,6 +114,56 @@ int ocelot_mact_forget(struct ocelot *ocelot,
 }
 EXPORT_SYMBOL(ocelot_mact_forget);
 
+int ocelot_mact_lookup(struct ocelot *ocelot, int *dst_idx,
+		       struct ocelot_mact_entry *entry)
+{
+	int val;
+
+	mutex_lock(&ocelot->mact_lock);
+
+	ocelot_mact_select(ocelot, entry->mac, entry->vid);
+
+	/* Issue a read command with MACACCESS_VALID=1. */
+	ocelot_write(ocelot, ANA_TABLES_MACACCESS_VALID |
+		     ANA_TABLES_MACACCESS_MAC_TABLE_CMD(MACACCESS_CMD_READ),
+		     ANA_TABLES_MACACCESS);
+
+	if (ocelot_mact_wait_for_completion(ocelot)) {
+		mutex_unlock(&ocelot->mact_lock);
+		return -ETIMEDOUT;
+	}
+
+	/* Read back the entry flags */
+	val = ocelot_read(ocelot, ANA_TABLES_MACACCESS);
+
+	mutex_unlock(&ocelot->mact_lock);
+
+	if (!(val & ANA_TABLES_MACACCESS_VALID))
+		return -ENOENT;
+
+	*dst_idx = ANA_TABLES_MACACCESS_DEST_IDX_X(val);
+	entry->type = ANA_TABLES_MACACCESS_ENTRYTYPE_X(val);
+
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_mact_lookup);
+
+int ocelot_mact_learn_streamdata(struct ocelot *ocelot, int dst_idx,
+				 struct ocelot_mact_entry *entry, u32 data)
+{
+	int ret;
+
+	mutex_lock(&ocelot->mact_lock);
+	ocelot_write(ocelot, data, ANA_TABLES_STREAMDATA);
+	mutex_unlock(&ocelot->mact_lock);
+
+	ret = ocelot_mact_learn(ocelot, dst_idx, entry->mac, entry->vid,
+				entry->type);
+
+	return ret;
+}
+EXPORT_SYMBOL(ocelot_mact_learn_streamdata);
+
 static void ocelot_mact_init(struct ocelot *ocelot)
 {
 	/* Configure the learning mode entries attributes:
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index e6773f4d09ce..455293652257 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -926,6 +926,11 @@ void ocelot_phylink_mac_link_up(struct ocelot *ocelot, int port,
 				bool tx_pause, bool rx_pause,
 				unsigned long quirks);
 
+int ocelot_mact_lookup(struct ocelot *ocelot, int *dst_idx,
+		       struct ocelot_mact_entry *entry);
+int ocelot_mact_learn_streamdata(struct ocelot *ocelot, int dst_idx,
+				 struct ocelot_mact_entry *entry, u32 data);
+
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 int ocelot_mrp_add(struct ocelot *ocelot, int port,
 		   const struct switchdev_obj_mrp *mrp);
-- 
2.17.1