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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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16
net/dsa/dsa2.c
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@@ -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;