netdev - [RFC v2 net-next 1/8] net: mscc: ocelot: add MAC table write and lookup operations

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Date:   Wed, 18 Aug 2021 14:19:15 +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
Subject: [RFC v2 net-next 1/8] net: mscc: ocelot: add MAC table write and lookup operations

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

ocelot_mact_write() can be used for directly modifying an FDB entry
situated at a given row and column, as opposed to the current
ocelot_mact_learn() which calculates the row and column indices
automatically (based on a 11-bit hash derived from the {DMAC, VID} key).

ocelot_mact_lookup() can be used to retrieve the row and column at which
an FDB entry with the given {DMAC, VID} key is found.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 47 ++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index adfb9781799e..0241272e9ce9 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -102,6 +102,53 @@ int ocelot_mact_forget(struct ocelot *ocelot,
 }
 EXPORT_SYMBOL(ocelot_mact_forget);
 
+int ocelot_mact_lookup(struct ocelot *ocelot, const unsigned char mac[ETH_ALEN],
+		       unsigned int vid, int *row, int *col)
+{
+	int val;
+
+	ocelot_mact_select(ocelot, mac, 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))
+		return -ETIMEDOUT;
+
+	/* Read back the entry flags */
+	val = ocelot_read(ocelot, ANA_TABLES_MACACCESS);
+	if (!(val & ANA_TABLES_MACACCESS_VALID))
+		return -ENOENT;
+
+	ocelot_field_read(ocelot, ANA_TABLES_MACTINDX_M_INDEX, row);
+	ocelot_field_read(ocelot, ANA_TABLES_MACTINDX_BUCKET, col);
+
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_mact_lookup);
+
+/* Like ocelot_mact_learn, except at a specific row and col. */
+void ocelot_mact_write(struct ocelot *ocelot, int port,
+		       const struct ocelot_mact_entry *entry,
+		       int row, int col)
+{
+	ocelot_mact_select(ocelot, entry->mac, entry->vid);
+
+	ocelot_field_write(ocelot, ANA_TABLES_MACTINDX_M_INDEX, row);
+	ocelot_field_write(ocelot, ANA_TABLES_MACTINDX_BUCKET, col);
+
+	ocelot_write(ocelot, ANA_TABLES_MACACCESS_VALID |
+		     ANA_TABLES_MACACCESS_ENTRYTYPE(entry->type) |
+		     ANA_TABLES_MACACCESS_DEST_IDX(port) |
+		     ANA_TABLES_MACACCESS_MAC_TABLE_CMD(MACACCESS_CMD_WRITE),
+		     ANA_TABLES_MACACCESS);
+
+	ocelot_mact_wait_for_completion(ocelot);
+}
+EXPORT_SYMBOL(ocelot_mact_write);
+
 static void ocelot_mact_init(struct ocelot *ocelot)
 {
 	/* Configure the learning mode entries attributes:
-- 
2.17.1