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net/mlx5: Tide up state_lock and vport enabled flag usage

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When eswitch is disabled, vport event handler is unregistered.
This unregistration already synchronizes with running EQ event handler
in below code flow.

mlx5_eswitch_disable()
  mlx5_eswitch_event_handlers_unregister()
    mlx5_eq_notifier_unregister()
      atomic_notifier_chain_unregister()
        synchronize_rcu()

notifier_callchain
  eswitch_vport_event()
    queue_work()

Additionally vport->enabled flag is set under state_lock during
esw_enable_vport() but is not read under state_lock in
(a) esw_disable_vport() and (b) under atomic context
eswitch_vport_event().

It is also necessary to synchronize with already scheduled vport event.
This is already achieved using below sequence.

mlx5_eswitch_event_handlers_unregister()
  [..]
  flush_workqueue()

Hence,
(a) Remove vport->enabled check in eswitch_vport_event() which
doesn't make any sense.
(b) Remove redundant flush_workqueue() on every vport disable.
(c) Keep esw_disable_vport() symmetric with esw_enable_vport() for
state_lock.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Vu Pham <vuhuong@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Parav Pandit 2019-10-28 23:35:13 +00:00 committed by Saeed Mahameed
parent 853b53520c
commit 77b094305b
1 changed files with 5 additions and 9 deletions
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14
drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
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@ -1750,18 +1750,16 @@ static void esw_disable_vport(struct mlx5_eswitch *esw,
{
u16 vport_num = vport->vport;
mutex_lock(&esw->state_lock);
if (!vport->enabled)
return;
goto done;
esw_debug(esw->dev, "Disabling vport(%d)\n", vport_num);
/* Mark this vport as disabled to discard new events */
vport->enabled = false;
/* Wait for current already scheduled events to complete */
flush_workqueue(esw->work_queue);
/* Disable events from this vport */
arm_vport_context_events_cmd(esw->dev, vport->vport, 0);
mutex_lock(&esw->state_lock);
/* We don't assume VFs will cleanup after themselves.
* Calling vport change handler while vport is disabled will cleanup
* the vport resources.
@ -1780,6 +1778,8 @@ static void esw_disable_vport(struct mlx5_eswitch *esw,
esw_legacy_vport_destroy_drop_counters(vport);
}
esw->enabled_vports--;
done:
mutex_unlock(&esw->state_lock);
}
@ -1793,12 +1793,8 @@ static int eswitch_vport_event(struct notifier_block *nb,
vport_num = be16_to_cpu(eqe->data.vport_change.vport_num);
vport = mlx5_eswitch_get_vport(esw, vport_num);
if (IS_ERR(vport))
return NOTIFY_OK;
if (vport->enabled)
if (!IS_ERR(vport))
queue_work(esw->work_queue, &vport->vport_change_handler);
return NOTIFY_OK;
}