net: dsa: add ports list in the switch fabric

Add a list of switch ports within the switch fabric. This will help the
lookup of a port inside the whole fabric, and it is the first step
towards supporting multiple CPU ports, before deprecating the usage of
the unique dst->cpu_dp pointer.

In preparation for a future allocation of the dsa_port structures,
return -ENOMEM in case no structure is returned, even though this
error cannot be reached yet.

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 2e4fe2f..6ff6dfc 100644 (file)
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -125,6 +125,9 @@ struct dsa_switch_tree {
         */
        struct dsa_port         *cpu_dp;
 
+       /* List of switch ports */
+       struct list_head ports;
+
        /*
         * Data for the individual switch chips.
         */
@@ -195,6 +198,8 @@ struct dsa_port {
        struct work_struct      xmit_work;
        struct sk_buff_head     xmit_queue;
 
+       struct list_head list;
+
        /*
         * Give the switch driver somewhere to hang its per-port private data
         * structures (accessible from the tagger).

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 1716535..ba27ff8 100644 (file)
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -45,6 +45,8 @@ static struct dsa_switch_tree *dsa_tree_alloc(int index)
 
        dst->index = index;
 
+       INIT_LIST_HEAD(&dst->ports);
+
        INIT_LIST_HEAD(&dst->list);
        list_add_tail(&dst->list, &dsa_tree_list);
 
@@ -616,6 +618,22 @@ static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
        return err;
 }
 
+static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
+{
+       struct dsa_switch_tree *dst = ds->dst;
+       struct dsa_port *dp;
+
+       dp = &ds->ports[index];
+
+       dp->ds = ds;
+       dp->index = index;
+
+       INIT_LIST_HEAD(&dp->list);
+       list_add_tail(&dp->list, &dst->ports);
+
+       return dp;
+}
+
 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
 {
        if (!name)
@@ -742,6 +760,20 @@ static int dsa_switch_parse_member_of(struct dsa_switch *ds,
        return 0;
 }
 
+static int dsa_switch_touch_ports(struct dsa_switch *ds)
+{
+       struct dsa_port *dp;
+       int port;
+
+       for (port = 0; port < ds->num_ports; port++) {
+               dp = dsa_port_touch(ds, port);
+               if (!dp)
+                       return -ENOMEM;
+       }
+
+       return 0;
+}
+
 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
 {
        int err;
@@ -750,6 +782,10 @@ static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
        if (err)
                return err;
 
+       err = dsa_switch_touch_ports(ds);
+       if (err)
+               return err;
+
        return dsa_switch_parse_ports_of(ds, dn);
 }
 
@@ -807,6 +843,8 @@ static int dsa_switch_parse_ports(struct dsa_switch *ds,
 
 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
 {
+       int err;
+
        ds->cd = cd;
 
        /* We don't support interconnected switches nor multiple trees via
@@ -817,6 +855,10 @@ static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
        if (!ds->dst)
                return -ENOMEM;
 
+       err = dsa_switch_touch_ports(ds);
+       if (err)
+               return err;
+
        return dsa_switch_parse_ports(ds, cd);
 }
 
@@ -849,7 +891,6 @@ static int dsa_switch_probe(struct dsa_switch *ds)
 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
 {
        struct dsa_switch *ds;
-       int i;
 
        ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
        if (!ds)
@@ -858,11 +899,6 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
        ds->dev = dev;
        ds->num_ports = n;
 
-       for (i = 0; i < ds->num_ports; ++i) {
-               ds->ports[i].index = i;
-               ds->ports[i].ds = ds;
-       }
-
        return ds;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_alloc);