mlxsw: spectrum: Do not assume PAUSE frames are disabled

When ieee_setpfc() gets called, PAUSE frames are not necessarily
disabled on the port.

Check if PAUSE frames are disabled or enabled and configure the port's
headroom buffer accordingly.

Fixes: d81a6bdb87ce ("mlxsw: spectrum: Add IEEE 802.1Qbb PFC support")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
index 01cfb75..3c4a178 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c
@@ -351,17 +351,17 @@ static int mlxsw_sp_dcbnl_ieee_setpfc(struct net_device *dev,
                                      struct ieee_pfc *pfc)
 {
        struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+       bool pause_en = mlxsw_sp_port_is_pause_en(mlxsw_sp_port);
        int err;
 
-       if ((mlxsw_sp_port->link.tx_pause || mlxsw_sp_port->link.rx_pause) &&
-           pfc->pfc_en) {
+       if (pause_en && pfc->pfc_en) {
                netdev_err(dev, "PAUSE frames already enabled on port\n");
                return -EINVAL;
        }
 
        err = __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
                                           mlxsw_sp_port->dcb.ets->prio_tc,
-                                          false, pfc);
+                                          pause_en, pfc);
        if (err) {
                netdev_err(dev, "Failed to configure port's headroom for PFC\n");
                return err;
@@ -380,7 +380,7 @@ static int mlxsw_sp_dcbnl_ieee_setpfc(struct net_device *dev,
 
 err_port_pfc_set:
        __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu,
-                                    mlxsw_sp_port->dcb.ets->prio_tc, false,
+                                    mlxsw_sp_port->dcb.ets->prio_tc, pause_en,
                                     mlxsw_sp_port->dcb.pfc);
        return err;
 }