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net: dsa: introduce a dsa_switch_find function

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Somewhat similar to dsa_tree_find, dsa_switch_find returns a dsa_switch
structure pointer by searching for its tree index and switch index (the
parameters from dsa,member). To be used, for example, by drivers who
implement .crosschip_bridge_join and need a reference to the other
switch indicated to by the tree_index and sw_index arguments.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2020-05-10 19:37:42 +03:00 committed by Jakub Kicinski
parent f66a6a69f9
commit 3b7bc1f091
2 changed files with 22 additions and 0 deletions
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1
include/net/dsa.h
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@ -672,6 +672,7 @@ static inline bool dsa_can_decode(const struct sk_buff *skb,
void dsa_unregister_switch(struct dsa_switch *ds); void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds); int dsa_register_switch(struct dsa_switch *ds);
struct dsa_switch *dsa_switch_find(int tree_index, int sw_index);
#ifdef CONFIG_PM_SLEEP #ifdef CONFIG_PM_SLEEP
int dsa_switch_suspend(struct dsa_switch *ds); int dsa_switch_suspend(struct dsa_switch *ds);
int dsa_switch_resume(struct dsa_switch *ds); int dsa_switch_resume(struct dsa_switch *ds);

21
net/dsa/dsa2.c
View File

@ -24,6 +24,27 @@ LIST_HEAD(dsa_tree_list);
static const struct devlink_ops dsa_devlink_ops = { static const struct devlink_ops dsa_devlink_ops = {
}; };
struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
{
struct dsa_switch_tree *dst;
struct dsa_port *dp;
list_for_each_entry(dst, &dsa_tree_list, list) {
if (dst->index != tree_index)
continue;
list_for_each_entry(dp, &dst->ports, list) {
if (dp->ds->index != sw_index)
continue;
return dp->ds;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(dsa_switch_find);
static struct dsa_switch_tree *dsa_tree_find(int index) static struct dsa_switch_tree *dsa_tree_find(int index)
{ {
struct dsa_switch_tree *dst; struct dsa_switch_tree *dst;