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net: dsa: Add helper to resolve bridge port from DSA port 

In order for a driver to be able to query a bridge for information
about itself, e.g. reading out port flags, it has to use a netdev that
is known to the bridge. In the simple case, that is just the netdev
representing the port, e.g. swp0 or swp1 in this example:

   br0
   / \
swp0 swp1

But in the case of an offloaded lag, this will be the bond or team
interface, e.g. bond0 in this example:

     br0
     /
  bond0
   / \
swp0 swp1

Add a helper that hides some of this complexity from the
drivers. Then, redefine dsa_port_offloads_bridge_port using the helper
to avoid double accounting of the set of possible offloaded uppers.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tobias Waldekranz 2021-03-18 20:25:33 +01:00 committed by David S. Miller
parent 44b958a686
commit cc76ce9e8d
2 changed files with 15 additions and 13 deletions
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14
include/net/dsa.h
View File

@ -493,6 +493,20 @@ static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
return dp->vlan_filtering;
}
static inline
struct net_device *dsa_port_to_bridge_port(const struct dsa_port *dp)
{
if (!dp->bridge_dev)
return NULL;
if (dp->lag_dev)
return dp->lag_dev;
else if (dp->hsr_dev)
return dp->hsr_dev;
return dp->slave;
}
typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
bool is_static, void *data);
struct dsa_switch_ops {

14
net/dsa/dsa_priv.h
View File

@ -233,19 +233,7 @@ extern const struct phylink_mac_ops dsa_port_phylink_mac_ops;
static inline bool dsa_port_offloads_bridge_port(struct dsa_port *dp,
struct net_device *dev)
{
/* Switchdev offloading can be configured on: */
if (dev == dp->slave)
/* DSA ports directly connected to a bridge, and event
* was emitted for the ports themselves.
*/
return true;
if (dp->lag_dev == dev)
/* DSA ports connected to a bridge via a LAG */
return true;
return false;
return dsa_port_to_bridge_port(dp) == dev;
}
static inline bool dsa_port_offloads_bridge(struct dsa_port *dp,