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net: dsa: mv88e6xxx: Release mutex between each ATU read

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The PTP code needs low latency access to the PTP hardware timestamps.
Reading all the ATU entries in one go adds a lot of latency to the PTP
code. So take and release the reg_lock mutex for each individual MAC
address in the ATU, allowing the PTP thread jump in between.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2018-02-15 14:38:35 +01:00 committed by David S. Miller
parent 377cda13a2
commit a61e540634
1 changed files with 8 additions and 6 deletions
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14
drivers/net/dsa/mv88e6xxx/chip.c
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@ -1437,7 +1437,9 @@ static int mv88e6xxx_port_db_dump_fid(struct mv88e6xxx_chip *chip,
eth_broadcast_addr(addr.mac);
do {
mutex_lock(&chip->reg_lock);
err = mv88e6xxx_g1_atu_getnext(chip, fid, &addr);
mutex_unlock(&chip->reg_lock);
if (err)
return err;
@ -1470,7 +1472,10 @@ static int mv88e6xxx_port_db_dump(struct mv88e6xxx_chip *chip, int port,
int err;
/* Dump port's default Filtering Information Database (VLAN ID 0) */
mutex_lock(&chip->reg_lock);
err = mv88e6xxx_port_get_fid(chip, port, &fid);
mutex_unlock(&chip->reg_lock);
if (err)
return err;
@ -1480,7 +1485,9 @@ static int mv88e6xxx_port_db_dump(struct mv88e6xxx_chip *chip, int port,
/* Dump VLANs' Filtering Information Databases */
do {
mutex_lock(&chip->reg_lock);
err = mv88e6xxx_vtu_getnext(chip, &vlan);
mutex_unlock(&chip->reg_lock);
if (err)
return err;
@ -1500,13 +1507,8 @@ static int mv88e6xxx_port_fdb_dump(struct dsa_switch *ds, int port,
dsa_fdb_dump_cb_t *cb, void *data)
{
struct mv88e6xxx_chip *chip = ds->priv;
int err;
mutex_lock(&chip->reg_lock);
err = mv88e6xxx_port_db_dump(chip, port, cb, data);
mutex_unlock(&chip->reg_lock);
return err;
return mv88e6xxx_port_db_dump(chip, port, cb, data);
}
static int mv88e6xxx_bridge_map(struct mv88e6xxx_chip *chip,