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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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6
include/net/dsa.h
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@@ -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