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mlxsw: spectrum: Limit number of FDB records per learning session 

Up until now a learning session ended whenever the number of queried
records was zero. This turned out to be problematic in situations where
a large number of MACs (48K) had to be processed by the switch driver,
as RTNL mutex is held during the learning session.

Instead, limit the number of FDB records that can be processed in a
session to 64. This means that every time the device is queried for
learning notifications (currently, every 100ms), up to 64 records will
be processed by the switch driver.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2016-08-24 12:00:23 +02:00 committed by David S. Miller
parent fff84d2a39
commit 1803e0fb7e
2 changed files with 17 additions and 12 deletions
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7
drivers/net/ethernet/mellanox/mlxsw/reg.h
View File

@ -591,6 +591,12 @@ static const struct mlxsw_reg_info mlxsw_reg_sfn = {
*/
MLXSW_ITEM32(reg, sfn, swid, 0x00, 24, 8);
/* reg_sfn_end
* Forces the current session to end.
* Access: OP
*/
MLXSW_ITEM32(reg, sfn, end, 0x04, 20, 1);
/* reg_sfn_num_rec
* Request: Number of learned notifications and aged-out notification
* records requested.
@ -605,6 +611,7 @@ static inline void mlxsw_reg_sfn_pack(char *payload)
{
MLXSW_REG_ZERO(sfn, payload);
mlxsw_reg_sfn_swid_set(payload, 0);
mlxsw_reg_sfn_end_set(payload, 1);
mlxsw_reg_sfn_num_rec_set(payload, MLXSW_REG_SFN_REC_MAX_COUNT);
}

22
drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
View File

@ -1496,20 +1496,18 @@ static void mlxsw_sp_fdb_notify_work(struct work_struct *work)
mlxsw_sp = container_of(work, struct mlxsw_sp, fdb_notify.dw.work);
rtnl_lock();
do {
mlxsw_reg_sfn_pack(sfn_pl);
err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(sfn), sfn_pl);
if (err) {
dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Failed to get FDB notifications\n");
break;
}
num_rec = mlxsw_reg_sfn_num_rec_get(sfn_pl);
for (i = 0; i < num_rec; i++)
mlxsw_sp_fdb_notify_rec_process(mlxsw_sp, sfn_pl, i);
mlxsw_reg_sfn_pack(sfn_pl);
err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(sfn), sfn_pl);
if (err) {
dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Failed to get FDB notifications\n");
goto out;
}
num_rec = mlxsw_reg_sfn_num_rec_get(sfn_pl);
for (i = 0; i < num_rec; i++)
mlxsw_sp_fdb_notify_rec_process(mlxsw_sp, sfn_pl, i);
} while (num_rec);
out:
rtnl_unlock();
kfree(sfn_pl);
mlxsw_sp_fdb_notify_work_schedule(mlxsw_sp);
}