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net: dsa: variable number of ports

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Change the ports[DSA_MAX_PORTS] array of the dsa_switch structure for a
zero-length array, allocated at the same time as the dsa_switch
structure itself. A dsa_switch_alloc() helper is provided for that.

This commit brings no functional change yet since we pass DSA_MAX_PORTS
as the number of ports for the moment. Future patches can update the DSA
drivers separately to support dynamic number of ports.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-01-27 15:29:36 -05:00 committed by David S. Miller
parent 1f5d492a34
commit a0c02161ec
6 changed files with 29 additions and 11 deletions
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7
drivers/net/dsa/b53/b53_common.c
View File

@ -1790,14 +1790,15 @@ struct b53_device *b53_switch_alloc(struct device *base,
struct dsa_switch *ds;
struct b53_device *dev;
ds = devm_kzalloc(base, sizeof(*ds) + sizeof(*dev), GFP_KERNEL);
ds = dsa_switch_alloc(base, DSA_MAX_PORTS);
if (!ds)
return NULL;
dev = (struct b53_device *)(ds + 1);
dev = devm_kzalloc(base, sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
ds->priv = dev;
ds->dev = base;
dev->dev = base;
dev->ds = ds;

3
drivers/net/dsa/mv88e6xxx/chip.c
View File

@ -4361,11 +4361,10 @@ static int mv88e6xxx_register_switch(struct mv88e6xxx_chip *chip)
struct device *dev = chip->dev;
struct dsa_switch *ds;
ds = devm_kzalloc(dev, sizeof(*ds), GFP_KERNEL);
ds = dsa_switch_alloc(dev, DSA_MAX_PORTS);
if (!ds)
return -ENOMEM;
ds->dev = dev;
ds->priv = chip;
ds->ops = &mv88e6xxx_switch_ops;

3
drivers/net/dsa/qca8k.c
View File

@ -954,12 +954,11 @@ qca8k_sw_probe(struct mdio_device *mdiodev)
if (id != QCA8K_ID_QCA8337)
return -ENODEV;
priv->ds = devm_kzalloc(&mdiodev->dev, sizeof(*priv->ds), GFP_KERNEL);
priv->ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
if (!priv->ds)
return -ENOMEM;
priv->ds->priv = priv;
priv->ds->dev = &mdiodev->dev;
priv->ds->ops = &qca8k_switch_ops;
mutex_init(&priv->reg_mutex);
dev_set_drvdata(&mdiodev->dev, priv);

6
include/net/dsa.h
View File

@ -190,8 +190,11 @@ struct dsa_switch {
u32 cpu_port_mask;
u32 enabled_port_mask;
u32 phys_mii_mask;
struct dsa_port ports[DSA_MAX_PORTS];
struct mii_bus *slave_mii_bus;
/* Dynamically allocated ports, keep last */
size_t num_ports;
struct dsa_port ports[];
};
static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
@ -386,6 +389,7 @@ static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
return dst->rcv != NULL;
}
struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n);
void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds, struct device *dev);
#ifdef CONFIG_PM_SLEEP

5
net/dsa/dsa.c
View File

@ -347,8 +347,8 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
/*
* Allocate and initialise switch state.
*/
ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
if (ds == NULL)
ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
if (!ds)
return ERR_PTR(-ENOMEM);
ds->dst = dst;
@ -356,7 +356,6 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
ds->cd = cd;
ds->ops = ops;
ds->priv = priv;
ds->dev = parent;
ret = dsa_switch_setup_one(ds, parent);
if (ret)

16
net/dsa/dsa2.c
View File

@ -666,6 +666,22 @@ out:
return err;
}
struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
{
size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
struct dsa_switch *ds;
ds = devm_kzalloc(dev, size, GFP_KERNEL);
if (!ds)
return NULL;
ds->dev = dev;
ds->num_ports = n;
return ds;
}
EXPORT_SYMBOL_GPL(dsa_switch_alloc);
int dsa_register_switch(struct dsa_switch *ds, struct device *dev)
{
int err;