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Date: Fri, 29 May 2015 21:13:33 +0200
From: Andrew Lunn <andrew@...n.ch>
To: netdev <netdev@...r.kernel.org>
Cc: Florian Fainelli <f.fainelli@...il.com>,
Guenter Roeck <linux@...ck-us.net>, mathieu@...eaurora.org,
Andrew Lunn <andrew@...n.ch>
Subject: [PATCH RFC 2/3] dsa: Add support for multiple cpu ports.
Some boards have two CPU interfaces connected to the switch, e.g. WiFi
access points, with 1 port labeled WAN, 4 ports labeled lan1-lan4, and
two port connected to the SoC.
This patch extends DSA to allows both CPU ports to be used. The "cpu"
node in the DSA tree can now have a phandle to the host interface it
connects to. Each user port can have a phandle to a cpu port which
should be used for traffic between the port and the CPU. Thus simple
load sharing over the two CPU ports can be achieved.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
Documentation/devicetree/bindings/net/dsa/dsa.txt | 66 ++++++++++++-
drivers/net/dsa/mv88e6xxx.c | 8 +-
include/net/dsa.h | 28 +++++-
net/dsa/dsa.c | 109 ++++++++++++++++++----
net/dsa/dsa_priv.h | 6 ++
net/dsa/slave.c | 10 +-
net/dsa/tag_brcm.c | 2 +-
net/dsa/tag_dsa.c | 2 +-
net/dsa/tag_edsa.c | 2 +-
net/dsa/tag_trailer.c | 2 +-
10 files changed, 206 insertions(+), 29 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt
index f0b4cd72411d..34f7f18026e5 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa.txt
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
@@ -58,13 +58,24 @@ Optionnal property:
Documentation/devicetree/bindings/net/ethernet.txt
for details.
+- ethernet : Optional for "cpu" ports. A phandle to an ethernet
+ device which will be used by this CPU port for
+ passing packets to/from the host. If not present,
+ the port will use the "dsa,ethernet" property
+ defined above.
+
+- cpu : Option for non "cpu"/"dsa" ports. A phandle to a
+ "cpu" port, which will be used for passing packets
+ from this port to the host. If not present, the first
+ "cpu" port will be used.
+
Optional subnodes:
- fixed-link : Fixed-link subnode describing a link to a non-MDIO
managed entity. See
Documentation/devicetree/bindings/net/fixed-link.txt
for details.
-Example:
+Examples:
dsa@0 {
compatible = "marvell,dsa";
@@ -115,3 +126,56 @@ Example:
};
};
};
+
+ dsa@1 {
+ compatible = "marvell,dsa";
+ #address-cells = <2>;
+ #size-cells = <0>;
+
+ dsa,ethernet = <ð0port>;
+ dsa,mii-bus = <&mdio>;
+
+ switch@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0 0>; /* MDIO address 0, switch 0 in tree */
+
+ port@0 {
+ reg = <0>;
+ label = "lan4";
+ };
+
+ port@1 {
+ reg = <1>;
+ label = "lan3";
+ cpu = <&cpu1>;
+ };
+
+ port@2 {
+ reg = <2>;
+ label = "lan2";
+ };
+
+ port@3 {
+ reg = <3>;
+ label = "lan1";
+ cpu = <&cpu1>;
+ };
+
+ port@4 {
+ reg = <4>;
+ label = "wan";
+ };
+
+ port@5 {
+ reg = <5>;
+ label = "cpu";
+ };
+
+ cpu1: port@6 {
+ reg = <6>;
+ label = "cpu";
+ ethernet = <ð1port>;
+ };
+ };
+ };
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 7fba330ce702..13e487f5bcdc 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -1051,7 +1051,7 @@ static int _mv88e6xxx_update_port_config(struct dsa_switch *ds, int port)
reg |= ds->phys_port_mask;
else
reg |= (ps->bridge_mask[fid] |
- (1 << dsa_upstream_port(ds))) & ~(1 << port);
+ (1 << dsa_port_upstream_port(ds, port))) & ~(1 << port);
return _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_BASE_VLAN, reg);
}
@@ -1433,7 +1433,7 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
mv88e6xxx_6095_family(ds) || mv88e6xxx_6065_family(ds)) {
if (ds->dsa_port_mask & (1 << port))
reg |= PORT_CONTROL_FRAME_MODE_DSA;
- if (port == dsa_upstream_port(ds))
+ if (dsa_is_upstream_port(ds, port))
reg |= PORT_CONTROL_FORWARD_UNKNOWN |
PORT_CONTROL_FORWARD_UNKNOWN_MC;
}
@@ -1464,11 +1464,11 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds)) {
/* Set the upstream port this port should use */
- reg |= dsa_upstream_port(ds);
+ reg |= dsa_port_upstream_port(ds, port);
/* enable forwarding of unknown multicast addresses to
* the upstream port
*/
- if (port == dsa_upstream_port(ds))
+ if (dsa_is_upstream_port(ds, port))
reg |= PORT_CONTROL_2_FORWARD_UNKNOWN;
}
diff --git a/include/net/dsa.h b/include/net/dsa.h
index fbca63ba8f73..137870732a36 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -56,6 +56,8 @@ struct dsa_chip_data {
*/
char *port_names[DSA_MAX_PORTS];
struct device_node *port_dn[DSA_MAX_PORTS];
+ struct net_device *port_ethernet[DSA_MAX_PORTS];
+ int port_cpu[DSA_MAX_PORTS];
/*
* An array (with nr_chips elements) of which element [a]
@@ -160,6 +162,7 @@ struct dsa_switch {
* Slave mii_bus and devices for the individual ports.
*/
u32 dsa_port_mask;
+ u32 cpu_port_mask;
u32 phys_port_mask;
u32 phys_mii_mask;
struct mii_bus *slave_mii_bus;
@@ -168,7 +171,12 @@ struct dsa_switch {
static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
{
- return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
+ return ds->cpu_port_mask & (1 << p);
+}
+
+static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
+{
+ return ds->dsa_port_mask & (1 << p);
}
static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
@@ -176,6 +184,11 @@ static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
return ds->phys_port_mask & (1 << p) && ds->ports[p];
}
+static inline bool dsa_is_upstream_port(struct dsa_switch *ds, int p)
+{
+ return dsa_is_cpu_port(ds, p) || dsa_is_dsa_port(ds, p);
+}
+
static inline u8 dsa_upstream_port(struct dsa_switch *ds)
{
struct dsa_switch_tree *dst = ds->dst;
@@ -192,6 +205,19 @@ static inline u8 dsa_upstream_port(struct dsa_switch *ds)
return ds->pd->rtable[dst->cpu_switch];
}
+static inline u8 dsa_port_upstream_port(struct dsa_switch *ds, int port)
+{
+
+ /*
+ * If this port has a specific upstream cpu port, use it,
+ * otherwise use the switch default.
+ */
+ if (ds->pd->port_cpu[port])
+ return ds->pd->port_cpu[port];
+ else
+ return dsa_upstream_port(ds);
+}
+
struct dsa_switch_driver {
struct list_head list;
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index b7b72d398d00..326643bbf64e 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -196,14 +196,11 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
continue;
if (!strcmp(name, "cpu")) {
- if (dst->cpu_switch != -1) {
- netdev_err(dst->master_netdev,
- "multiple cpu ports?!\n");
- ret = -EINVAL;
- goto out;
+ if (dst->cpu_switch == -1) {
+ dst->cpu_switch = index;
+ dst->cpu_port = i;
}
- dst->cpu_switch = index;
- dst->cpu_port = i;
+ ds->cpu_port_mask |= 1 << i;
} else if (!strcmp(name, "dsa")) {
ds->dsa_port_mask |= 1 << i;
} else {
@@ -211,6 +208,11 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
}
valid_name_found = true;
}
+ pr_info("cpu_port_mask %x\n", ds->cpu_port_mask);
+ pr_info("dsa_port_mask %x\n", ds->dsa_port_mask);
+ pr_info("phys_port_mask %x\n", ds->phys_port_mask);
+ pr_info("cpu_switch %d\n", dst->cpu_switch);
+ pr_info("cpu_port %d\n", dst->cpu_port);
if (!valid_name_found && i == DSA_MAX_PORTS) {
ret = -EINVAL;
@@ -558,11 +560,15 @@ static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
{
int i;
int port_index;
+ struct dsa_chip_data *cd;
for (i = 0; i < pd->nr_chips; i++) {
+ cd = &pd->chip[i];
port_index = 0;
while (port_index < DSA_MAX_PORTS) {
- kfree(pd->chip[i].port_names[port_index]);
+ kfree(cd->port_names[port_index]);
+ if (cd->port_ethernet[port_index])
+ dev_put(cd->port_ethernet[port_index]);
port_index++;
}
kfree(pd->chip[i].rtable);
@@ -570,15 +576,74 @@ static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
kfree(pd->chip);
}
+static int dsa_of_probe_dsa_port(struct dsa_platform_data *pd,
+ struct dsa_chip_data *cd,
+ int chip_index, struct device_node *port,
+ int port_index)
+{
+ struct device_node *link;
+
+ link = of_parse_phandle(port, "link", 0);
+ if (!link)
+ return -EINVAL;
+
+ if (pd->nr_chips == 1)
+ return -EINVAL;
+
+ return dsa_of_setup_routing_table(pd, cd, chip_index, port_index,
+ link);
+}
+
+static int dsa_of_probe_cpu_port(struct dsa_chip_data *cd,
+ struct device_node *port,
+ int port_index)
+{
+ struct net_device *ethernet_dev;
+ struct device_node *ethernet;
+
+ ethernet = of_parse_phandle(port, "ethernet", 0);
+ if (ethernet) {
+ ethernet_dev = of_find_net_device_by_node(ethernet);
+ if (!ethernet_dev)
+ return -EPROBE_DEFER;
+
+ dev_hold(ethernet_dev);
+ cd->port_ethernet[port_index] = ethernet_dev;
+ }
+
+ return 0;
+}
+
+static int dsa_of_probe_user_port(struct dsa_chip_data *cd,
+ struct device_node *port,
+ int port_index)
+{
+ struct device_node *cpu_port;
+ const unsigned int *cpu_port_reg;
+ int cpu_port_index;
+
+ cpu_port = of_parse_phandle(port, "cpu", 0);
+ if (cpu_port) {
+ cpu_port_reg = of_get_property(cpu_port, "reg", NULL);
+ if (!cpu_port_reg)
+ return -EINVAL;
+ cpu_port_index = be32_to_cpup(cpu_port_reg);
+ cd->port_cpu[port_index] = cpu_port_index;
+ }
+
+ return 0;
+}
+
static int dsa_of_probe_port(struct dsa_platform_data *pd,
struct dsa_chip_data *cd,
int chip_index,
struct device_node *port)
{
+ bool is_cpu_port = false, is_dsa_port = false;
+ bool is_user_port = false;
const unsigned int *port_reg;
const char *port_name;
- struct device_node *link;
- int port_index, ret;
+ int port_index, ret = 0;
port_reg = of_get_property(port, "reg", NULL);
if (!port_reg)
@@ -590,20 +655,28 @@ static int dsa_of_probe_port(struct dsa_platform_data *pd,
if (!port_name)
return -EINVAL;
+ if (!strcmp(port_name, "cpu"))
+ is_cpu_port = true;
+ if (!strcmp(port_name, "dsa"))
+ is_dsa_port = true;
+ if (!is_cpu_port && !is_dsa_port)
+ is_user_port = true;
+
cd->port_dn[port_index] = port;
cd->port_names[port_index] = kstrdup(port_name, GFP_KERNEL);
if (!cd->port_names[port_index])
return -ENOMEM;
- link = of_parse_phandle(port, "link", 0);
-
- if (!strcmp(port_name, "dsa") && link && pd->nr_chips > 1) {
- ret = dsa_of_setup_routing_table(pd, cd,
- chip_index, port_index, link);
- if (ret)
- return ret;
- }
+ if (is_dsa_port)
+ ret = dsa_of_probe_dsa_port(pd, cd, chip_index, port,
+ port_index);
+ if (is_cpu_port)
+ ret = dsa_of_probe_cpu_port(cd, port, port_index);
+ if (is_user_port)
+ ret = dsa_of_probe_user_port(cd, port, port_index);
+ if (ret)
+ return ret;
return port_index;
}
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index d5f1f9b862ea..7f11beef1b50 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -30,6 +30,12 @@ struct dsa_slave_priv {
struct net_device *dev);
/*
+ * Which host device do we used to send packets to the switch
+ * for this port.
+ */
+ struct net_device *master;
+
+ /*
* Which switch this port is a part of, and the port index
* for this port.
*/
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 04ffad311704..b1ca6a63b090 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -875,11 +875,18 @@ int dsa_slave_resume(struct net_device *slave_dev)
int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
int port, char *name)
{
- struct net_device *master = ds->dst->master_netdev;
+ struct net_device *master;
struct net_device *slave_dev;
struct dsa_slave_priv *p;
+ int port_cpu = ds->pd->port_cpu[port];
int ret;
+ if (port_cpu && ds->pd->port_ethernet[port_cpu])
+ master = ds->pd->port_ethernet[port_cpu];
+ else
+ master = ds->dst->master_netdev;
+ master->dsa_ptr = (void *)ds->dst;
+
slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
NET_NAME_UNKNOWN, ether_setup);
if (slave_dev == NULL)
@@ -903,6 +910,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
p->dev = slave_dev;
p->parent = ds;
p->port = port;
+ p->master = master;
switch (ds->dst->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 83d3572cdb20..0367ddd9bed5 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -90,7 +90,7 @@ static netdev_tx_t brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev)
/* Queue the SKB for transmission on the parent interface, but
* do not modify its EtherType
*/
- skb->dev = p->parent->dst->master_netdev;
+ skb->dev = p->master;
dev_queue_xmit(skb);
return NETDEV_TX_OK;
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 2dab27063273..11ae958e7125 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -63,7 +63,7 @@ static netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev)
dsa_header[3] = 0x00;
}
- skb->dev = p->parent->dst->master_netdev;
+ skb->dev = p->master;
dev_queue_xmit(skb);
return NETDEV_TX_OK;
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index 9aeda596f7ec..87df439985e2 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -76,7 +76,7 @@ static netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev)
edsa_header[7] = 0x00;
}
- skb->dev = p->parent->dst->master_netdev;
+ skb->dev = p->master;
dev_queue_xmit(skb);
return NETDEV_TX_OK;
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index e268f9db8893..fa8895341d46 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -57,7 +57,7 @@ static netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev)
trailer[2] = 0x10;
trailer[3] = 0x00;
- nskb->dev = p->parent->dst->master_netdev;
+ nskb->dev = p->master;
dev_queue_xmit(nskb);
return NETDEV_TX_OK;
--
2.1.4
--
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