From b489a2000f19e414710d2887fe3e24e903242766 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 4 Aug 2016 17:36:20 +0300 Subject: [PATCH 1/3] 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 Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c index 01cfb7512827..3c4a178730ae 100644 --- 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; } From 07d50cae0661e5479d54d6e3e21cad15b1198103 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 4 Aug 2016 17:36:21 +0300 Subject: [PATCH 2/3] mlxsw: spectrum: Do not override PAUSE settings The PFCC register is used to configure both PAUSE and PFC frames. Therefore, when PFC frames are disabled we must make sure we don't mistakenly also disable PAUSE frames (which might be enabled). Fix this by packing the PFCC register with the current PAUSE settings. Note that this register is also accessed via ethtool ops, but there we are guaranteed to have PFC disabled. Fixes: d81a6bdb87ce ("mlxsw: spectrum: Add IEEE 802.1Qbb PFC support") Signed-off-by: Ido Schimmel Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c index 3c4a178730ae..b6ed7f7c531e 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c @@ -341,6 +341,8 @@ static int mlxsw_sp_port_pfc_set(struct mlxsw_sp_port *mlxsw_sp_port, char pfcc_pl[MLXSW_REG_PFCC_LEN]; mlxsw_reg_pfcc_pack(pfcc_pl, mlxsw_sp_port->local_port); + mlxsw_reg_pfcc_pprx_set(pfcc_pl, mlxsw_sp_port->link.rx_pause); + mlxsw_reg_pfcc_pptx_set(pfcc_pl, mlxsw_sp_port->link.tx_pause); mlxsw_reg_pfcc_prio_pack(pfcc_pl, pfc->pfc_en); return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pfcc), From 4de34eb5743f720dc4798f0647f75c21d44aa1f8 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 4 Aug 2016 17:36:22 +0300 Subject: [PATCH 3/3] mlxsw: spectrum: Add missing DCB rollback in error path We correctly execute mlxsw_sp_port_dcb_fini() when port is removed, but I missed its rollback in the error path of port creation, so add it. Fixes: f00817df2b42 ("mlxsw: spectrum: Introduce support for Data Center Bridging (DCB)") Signed-off-by: Ido Schimmel Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c index c3e61500819d..e1b8f62ccaed 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c @@ -2220,6 +2220,7 @@ err_port_vlan_init: err_core_port_init: unregister_netdev(dev); err_register_netdev: + mlxsw_sp_port_dcb_fini(mlxsw_sp_port); err_port_dcb_init: err_port_ets_init: err_port_buffers_init: