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net: dsa: list DSA links in the fabric

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Implement a new list of DSA links in the switch fabric itself, to
provide an alterative to the ds->rtable static arrays.

At the same time, provide a new dsa_routing_port() helper to abstract
the usage of ds->rtable in drivers. If there's no port to reach a
given device, return the first invalid port, ds->num_ports. This avoids
potential signedness errors or the need to define special values.

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot
2019-10-30 22:09:13 -04:00
committed by David S. Miller
parent 5c26c1d6df
commit c5f51765a1
3 changed files with 72 additions and 6 deletions
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8
drivers/net/dsa/mv88e6xxx/chip.c
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@@ -1143,6 +1143,7 @@ static int mv88e6xxx_pri_setup(struct mv88e6xxx_chip *chip)
static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
{
struct dsa_switch *ds = chip->ds;
int target, port;
int err;
@@ -1151,10 +1152,9 @@ static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
/* Initialize the routing port to the 32 possible target devices */
for (target = 0; target < 32; target++) {
port = 0x1f;
if (target < DSA_MAX_SWITCHES)
if (chip->ds->rtable[target] != DSA_RTABLE_NONE)
port = chip->ds->rtable[target];
port = dsa_routing_port(ds, target);
if (port == ds->num_ports)
port = 0x1f;
err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
if (err)