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Message-ID: <20240816065924.1094942-1-vtpieter@gmail.com>
Date: Fri, 16 Aug 2024 08:59:20 +0200
From: vtpieter@...il.com
To: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Woojung Huh <woojung.huh@...rochip.com>,
UNGLinuxDriver@...rochip.com,
Russell King <linux@...linux.org.uk>
Cc: Pieter Van Trappen <pieter.van.trappen@...n.ch>,
netdev@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [RFC] net: dsa: microchip: add KSZ8 change_tag_protocol support
From: Pieter Van Trappen <pieter.van.trappen@...n.ch>
Add support for changing the KSZ8 switches tag protocol. In fact
these devices can only enable or disable the tail tag, so there's
really only three supported protocols:
- DSA_TAG_PROTO_KSZ8795 for KSZ87xx
- DSA_TAG_PROTO_KSZ9893 for KSZ88x3
- DSA_TAG_PROTO_NONE
When disabled, this can be used as a workaround for the 'Common
pitfalls using DSA setups' [1] to use the conduit network interface as
a regular one, admittedly forgoing most DSA functionality and using
the device as an unmanaged switch whilst allowing control
operations (ethtool, PHY management, WoL). Implementing the new
software-defined DSA tagging protocol tag_8021q [2] for these devices
seems overkill for this use case at the time being.
Link: Documentation/networking/dsa/dsa.rst [1]
Link: https://lpc.events/event/11/contributions/949/attachments/823/1555/paper.pdf [2]
Signed-off-by: Pieter Van Trappen <pieter.van.trappen@...n.ch>
---
.../devicetree/bindings/net/dsa/dsa-port.yaml | 1 +
drivers/net/dsa/microchip/ksz8.h | 2 ++
drivers/net/dsa/microchip/ksz8795.c | 28 +++++++++++++++++++
drivers/net/dsa/microchip/ksz_common.c | 19 +++++++++++--
drivers/net/dsa/microchip/ksz_common.h | 2 ++
5 files changed, 49 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
index 480120469953..ded8019b6ba6 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
@@ -53,6 +53,7 @@ properties:
enum:
- dsa
- edsa
+ - none
- ocelot
- ocelot-8021q
- rtl8_4
diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index ae43077e76c3..802cb9d657bb 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -54,6 +54,8 @@ int ksz8_reset_switch(struct ksz_device *dev);
int ksz8_switch_init(struct ksz_device *dev);
void ksz8_switch_exit(struct ksz_device *dev);
int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu);
+int ksz8_change_tag_protocol(struct ksz_device *dev,
+ enum dsa_tag_protocol proto);
void ksz8_phylink_mac_link_up(struct phylink_config *config,
struct phy_device *phydev, unsigned int mode,
phy_interface_t interface, int speed, int duplex,
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index d27b9c36d73f..0704d5404c5b 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -127,6 +127,34 @@ int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu)
return -EOPNOTSUPP;
}
+/**
+ * ksz8_change_tag_protocol - Change tag protocol
+ * @dev: The device structure.
+ * @proto: The requested protocol.
+ *
+ * This function allows changing the tag protocol. In fact the ksz8
+ * devices can only enable or disable the tail tag, so there's really
+ * only 2 supported protocols.
+ *
+ * Return: 0 on success, -EPROTONOSUPPORT in case protocol not supported.
+ */
+int ksz8_change_tag_protocol(struct ksz_device *dev,
+ enum dsa_tag_protocol proto)
+{
+ const u32 *masks = dev->info->masks;
+ const u16 *regs = dev->info->regs;
+
+ if ( (proto == DSA_TAG_PROTO_KSZ8795 && ksz_is_ksz87xx(dev)) ||
+ (proto == DSA_TAG_PROTO_KSZ9893 && ksz_is_ksz88x3(dev)) )
+ ksz_cfg(dev, regs[S_TAIL_TAG_CTRL], masks[SW_TAIL_TAG_ENABLE], true);
+ else if (proto == DSA_TAG_PROTO_NONE)
+ ksz_cfg(dev, regs[S_TAIL_TAG_CTRL], masks[SW_TAIL_TAG_ENABLE], false);
+ else
+ return -EPROTONOSUPPORT;
+
+ return 0;
+}
+
static int ksz8_port_queue_split(struct ksz_device *dev, int port, int queues)
{
u8 mask_4q, mask_2q;
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 1491099528be..a87f43908a9a 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -307,6 +307,7 @@ static const struct ksz_dev_ops ksz8_dev_ops = {
.init = ksz8_switch_init,
.exit = ksz8_switch_exit,
.change_mtu = ksz8_change_mtu,
+ .change_tag_protocol = ksz8_change_tag_protocol,
};
static void ksz9477_phylink_mac_link_up(struct phylink_config *config,
@@ -2893,9 +2894,7 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
struct ksz_device *dev = ds->priv;
enum dsa_tag_protocol proto = DSA_TAG_PROTO_NONE;
- if (dev->chip_id == KSZ8795_CHIP_ID ||
- dev->chip_id == KSZ8794_CHIP_ID ||
- dev->chip_id == KSZ8765_CHIP_ID)
+ if (ksz_is_ksz87xx(dev))
proto = DSA_TAG_PROTO_KSZ8795;
if (dev->chip_id == KSZ8830_CHIP_ID ||
@@ -2917,12 +2916,25 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
return proto;
}
+static int ksz_change_tag_protocol(struct dsa_switch *ds,
+ enum dsa_tag_protocol proto)
+{
+ struct ksz_device *dev = ds->priv;
+
+ if (dev->dev_ops->change_tag_protocol)
+ return dev->dev_ops->change_tag_protocol(dev, proto);
+ else
+ return -EPROTONOSUPPORT;
+}
+
static int ksz_connect_tag_protocol(struct dsa_switch *ds,
enum dsa_tag_protocol proto)
{
struct ksz_tagger_data *tagger_data;
switch (proto) {
+ case DSA_TAG_PROTO_NONE:
+ return 0;
case DSA_TAG_PROTO_KSZ8795:
return 0;
case DSA_TAG_PROTO_KSZ9893:
@@ -3974,6 +3986,7 @@ static int ksz_hsr_leave(struct dsa_switch *ds, int port,
static const struct dsa_switch_ops ksz_switch_ops = {
.get_tag_protocol = ksz_get_tag_protocol,
+ .change_tag_protocol = ksz_change_tag_protocol,
.connect_tag_protocol = ksz_connect_tag_protocol,
.get_phy_flags = ksz_get_phy_flags,
.setup = ksz_setup,
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 5f0a628b9849..badae22f4613 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -354,6 +354,8 @@ struct ksz_dev_ops {
void (*get_caps)(struct ksz_device *dev, int port,
struct phylink_config *config);
int (*change_mtu)(struct ksz_device *dev, int port, int mtu);
+ int (*change_tag_protocol)(struct ksz_device *dev,
+ enum dsa_tag_protocol proto);
void (*freeze_mib)(struct ksz_device *dev, int port, bool freeze);
void (*port_init_cnt)(struct ksz_device *dev, int port);
void (*phylink_mac_link_up)(struct ksz_device *dev, int port,
base-commit: dd1bf9f9df156b43e5122f90d97ac3f59a1a5621
--
2.43.0
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