From: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
To: <andrew@lunn.ch>, <netdev@vger.kernel.org>, <olteanv@gmail.com>,
<robh+dt@kernel.org>
Cc: <UNGLinuxDriver@microchip.com>, <hkallweit1@gmail.com>,
<linux@armlinux.org.uk>, <davem@davemloft.net>, <kuba@kernel.org>,
<linux-kernel@vger.kernel.org>, <vivien.didelot@gmail.com>,
<f.fainelli@gmail.com>, <devicetree@vger.kernel.org>
Subject: [PATCH v2 net-next 3/9] net: dsa: tag_ksz: add tag handling for Microchip LAN937x
Date: Thu, 22 Apr 2021 15:12:51 +0530 [thread overview]
Message-ID: <20210422094257.1641396-4-prasanna.vengateshan@microchip.com> (raw)
In-Reply-To: <20210422094257.1641396-1-prasanna.vengateshan@microchip.com>
The Microchip LAN937X switches have a tagging protocol which is
very similar to KSZ tagging. So that the implementation is added to
tag_ksz.c and reused common APIs
Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
---
include/net/dsa.h | 2 ++
net/dsa/Kconfig | 4 ++--
net/dsa/tag_ksz.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 507082959aa4..98c1ab6dc4dc 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -50,6 +50,7 @@ struct phylink_link_state;
#define DSA_TAG_PROTO_OCELOT_8021Q_VALUE 20
#define DSA_TAG_PROTO_SEVILLE_VALUE 21
#define DSA_TAG_PROTO_BRCM_LEGACY_VALUE 22
+#define DSA_TAG_PROTO_LAN937X_VALUE 23
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
@@ -75,6 +76,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_XRS700X = DSA_TAG_PROTO_XRS700X_VALUE,
DSA_TAG_PROTO_OCELOT_8021Q = DSA_TAG_PROTO_OCELOT_8021Q_VALUE,
DSA_TAG_PROTO_SEVILLE = DSA_TAG_PROTO_SEVILLE_VALUE,
+ DSA_TAG_PROTO_LAN937X = DSA_TAG_PROTO_LAN937X_VALUE,
};
struct packet_type;
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index cbc2bd643ab2..888eb79a85f2 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -97,10 +97,10 @@ config NET_DSA_TAG_MTK
Mediatek switches.
config NET_DSA_TAG_KSZ
- tristate "Tag driver for Microchip 8795/9477/9893 families of switches"
+ tristate "Tag driver for Microchip 8795/937x/9477/9893 families of switches"
help
Say Y if you want to enable support for tagging frames for the
- Microchip 8795/9477/9893 families of switches.
+ Microchip 8795/937x/9477/9893 families of switches.
config NET_DSA_TAG_RTL4_A
tristate "Tag driver for Realtek 4 byte protocol A tags"
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 4820dbcedfa2..a67f21bdab8f 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -190,10 +190,68 @@ static const struct dsa_device_ops ksz9893_netdev_ops = {
DSA_TAG_DRIVER(ksz9893_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
+/* For xmit, 2 bytes are added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0 : represents tag override, lookup and valid
+ * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x80=port8)
+ *
+ * For rcv, 1 byte is added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0 : zero-based value represents port
+ * (eg, 0x00=port1, 0x02=port3, 0x07=port8)
+ */
+#define LAN937X_INGRESS_TAG_LEN 2
+
+#define LAN937X_TAIL_TAG_OVERRIDE BIT(11)
+#define LAN937X_TAIL_TAG_LOOKUP BIT(12)
+#define LAN937X_TAIL_TAG_VALID BIT(13)
+#define LAN937X_TAIL_TAG_PORT_MASK 7
+
+static struct sk_buff *lan937x_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ __be16 *tag;
+ u8 *addr;
+ u16 val;
+
+ tag = skb_put(skb, LAN937X_INGRESS_TAG_LEN);
+ addr = skb_mac_header(skb);
+
+ val = BIT(dp->index);
+
+ if (is_link_local_ether_addr(addr))
+ val |= LAN937X_TAIL_TAG_OVERRIDE;
+
+ /* Tail tag valid bit - This bit should always be set by the CPU*/
+ val |= LAN937X_TAIL_TAG_VALID;
+
+ *tag = cpu_to_be16(val);
+
+ return skb;
+}
+
+static const struct dsa_device_ops lan937x_netdev_ops = {
+ .name = "lan937x",
+ .proto = DSA_TAG_PROTO_LAN937X,
+ .xmit = lan937x_xmit,
+ .rcv = ksz9477_rcv,
+ .overhead = LAN937X_INGRESS_TAG_LEN,
+ .tail_tag = true,
+};
+
+DSA_TAG_DRIVER(lan937x_netdev_ops);
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN937X);
+
static struct dsa_tag_driver *dsa_tag_driver_array[] = {
&DSA_TAG_DRIVER_NAME(ksz8795_netdev_ops),
&DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
&DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
+ &DSA_TAG_DRIVER_NAME(lan937x_netdev_ops),
};
module_dsa_tag_drivers(dsa_tag_driver_array);
--
2.27.0
next prev parent reply other threads:[~2021-04-22 9:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 9:42 [PATCH v2 net-next 0/9] net: dsa: microchip: DSA driver support for LAN937x switch Prasanna Vengateshan
2021-04-22 9:42 ` [PATCH v2 net-next 1/9] dt-bindings: net: dsa: dt bindings for microchip lan937x Prasanna Vengateshan
2021-04-22 15:30 ` Rob Herring
2021-04-22 17:38 ` Rob Herring
2021-04-26 4:05 ` Prasanna Vengateshan
2021-04-26 16:04 ` Florian Fainelli
2021-04-22 9:42 ` [PATCH v2 net-next 2/9] net: phy: Add support for LAN937x T1 phy driver Prasanna Vengateshan
2021-04-22 12:45 ` Andrew Lunn
2021-04-26 4:06 ` Prasanna Vengateshan
2021-04-22 9:42 ` Prasanna Vengateshan [this message]
2021-04-22 19:18 ` [PATCH v2 net-next 3/9] net: dsa: tag_ksz: add tag handling for Microchip LAN937x Vladimir Oltean
2021-04-26 4:33 ` Prasanna Vengateshan
2021-04-26 12:27 ` Andrew Lunn
2021-04-22 9:42 ` [PATCH v2 net-next 4/9] net: dsa: microchip: add DSA support for microchip lan937x Prasanna Vengateshan
2021-04-22 19:59 ` Vladimir Oltean
2021-04-22 23:28 ` Andrew Lunn
2021-04-26 8:54 ` Prasanna Vengateshan
2021-04-26 12:34 ` Andrew Lunn
2021-04-27 7:43 ` Prasanna Vengateshan
2021-04-22 23:32 ` Andrew Lunn
2021-04-22 23:38 ` Andrew Lunn
2021-04-22 23:43 ` Andrew Lunn
2021-04-22 9:42 ` [PATCH v2 net-next 5/9] net: dsa: microchip: add support for phylink management Prasanna Vengateshan
2021-04-22 20:05 ` Vladimir Oltean
2021-04-22 9:42 ` [PATCH v2 net-next 6/9] net: dsa: microchip: add support for ethtool port counters Prasanna Vengateshan
2021-04-22 9:42 ` [PATCH v2 net-next 7/9] net: dsa: microchip: add support for port mirror operations Prasanna Vengateshan
2021-04-22 20:11 ` Vladimir Oltean
2021-04-22 9:42 ` [PATCH v2 net-next 8/9] net: dsa: microchip: add support for fdb and mdb management Prasanna Vengateshan
2021-04-22 9:42 ` [PATCH v2 net-next 9/9] net: dsa: microchip: add support for vlan operations Prasanna Vengateshan
2021-04-22 19:03 ` Vladimir Oltean
2021-05-06 14:51 ` Prasanna Vengateshan
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