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net: dsa: add dsa_to_port helper

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The dsa_port structure is part of DSA core data and must only be updated
by the later. It is OK and sometimes necessary for the DSA drivers to
access this data, but this has to be read only.

For that purpose, add a dsa_to_port() helper which returns a const
pointer to a dsa_port structure which must be used by DSA drivers from
now on instead of digging into ds->ports[] themselves.

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
2017-10-16 11:12:19 -04:00
committed by David S. Miller
parent f8b8b1cd5a
commit c8652c83bc
7 changed files with 17 additions and 12 deletions
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5
include/net/dsa.h
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@@ -269,6 +269,11 @@ static inline bool dsa_is_normal_port(struct dsa_switch *ds, int p)
return !dsa_is_cpu_port(ds, p) && !dsa_is_dsa_port(ds, p);
}
static inline const struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
{
return &ds->ports[p];
}
static inline u8 dsa_upstream_port(struct dsa_switch *ds)
{
struct dsa_switch_tree *dst = ds->dst;