Commit 3b8fac5d authored by Vivien Didelot's avatar Vivien Didelot Committed by David S. Miller
Browse files

net: dsa: introduce dsa_towards_port helper 



Add a new helper returning the local port used to reach an arbitrary
switch port in the fabric.

Its only user at the moment is the dsa_upstream_port helper, which
returns the local port reaching the dedicated CPU port, but it will be
used in cross-chip FDB operations.

Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5420683a

include/net/dsa.h

+13 −10
Original line number Diff line number Diff line
@@ -296,20 +296,23 @@ static inline u32 dsa_user_ports(struct dsa_switch *ds) 
	return mask;

}



/* Return the local port used to reach an arbitrary switch port */

static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,

					    int port)

{

	if (device == ds->index)

		return port;

	else

		return ds->rtable[device];

}



/* Return the local port used to reach the dedicated CPU port */

static inline u8 dsa_upstream_port(struct dsa_switch *ds)

{

	struct dsa_switch_tree *dst = ds->dst;

	struct dsa_port *cpu_dp = dst->cpu_dp;



	/*

	 * If this is the root switch (i.e. the switch that connects

	 * to the CPU), return the cpu port number on this switch.

	 * Else return the (DSA) port number that connects to the

	 * switch that is one hop closer to the cpu.

	 */

	if (dst->cpu_dp->ds == ds)

		return dst->cpu_dp->index;

	else

		return ds->rtable[dst->cpu_dp->ds->index];

	return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);

}



typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,

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