net/mlx4_en: Fix mixed PFC and Global pause user control requests

Global pause and PFC configuration should be mutually exclusive (i.e. only
one of them at most can be set). However, once PFC was turned off,
driver automatically turned Global pause on. This is a bug.

Fix the driver behaviour to turn off PFC/Global once the user turned the
other on.

This also fixed a weird behaviour that at a current time, the profile
had both PFC and global pause configuration turned on, which is
Hardware-wise impossible and caused returning false positive indication
to query tools.

In addition, fix error code when setting global pause or PFC to change
metadata only upon successful change.

Also, removed useless debug print.

Fixes: af7d51852631 ("net/mlx4_en: Add DCB PFC support through CEE netlink commands")
Fixes: c27a02cd94d6 ("mlx4_en: Add driver for Mellanox ConnectX 10GbE NIC")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 31 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
index 1a0c3bf86ead..752a72499b4f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
@@ -156,57 +156,63 @@ static int mlx4_en_dcbnl_getnumtcs(struct net_device *netdev, int tcid, u8 *num)
 static u8 mlx4_en_dcbnl_set_all(struct net_device *netdev)
 {
 	struct mlx4_en_priv *priv = netdev_priv(netdev);
+	struct mlx4_en_port_profile *prof = priv->prof;
 	struct mlx4_en_dev *mdev = priv->mdev;
+	u8 tx_pause, tx_ppp, rx_pause, rx_ppp;
 
 	if (!(priv->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
 		return 1;
 
 	if (priv->cee_config.pfc_state) {
 		int tc;
+		rx_ppp = prof->rx_ppp;
+		tx_ppp = prof->tx_ppp;
 
-		priv->prof->rx_pause = 0;
-		priv->prof->tx_pause = 0;
 		for (tc = 0; tc < CEE_DCBX_MAX_PRIO; tc++) {
 			u8 tc_mask = 1 << tc;
 
 			switch (priv->cee_config.dcb_pfc[tc]) {
 			case pfc_disabled:
-				priv->prof->tx_ppp &= ~tc_mask;
-				priv->prof->rx_ppp &= ~tc_mask;
+				tx_ppp &= ~tc_mask;
+				rx_ppp &= ~tc_mask;
 				break;
 			case pfc_enabled_full:
-				priv->prof->tx_ppp |= tc_mask;
-				priv->prof->rx_ppp |= tc_mask;
+				tx_ppp |= tc_mask;
+				rx_ppp |= tc_mask;
 				break;
 			case pfc_enabled_tx:
-				priv->prof->tx_ppp |= tc_mask;
-				priv->prof->rx_ppp &= ~tc_mask;
+				tx_ppp |= tc_mask;
+				rx_ppp &= ~tc_mask;
 				break;
 			case pfc_enabled_rx:
-				priv->prof->tx_ppp &= ~tc_mask;
-				priv->prof->rx_ppp |= tc_mask;
+				tx_ppp &= ~tc_mask;
+				rx_ppp |= tc_mask;
 				break;
 			default:
 				break;
 			}
 		}
-		en_dbg(DRV, priv, "Set pfc on\n");
+		rx_pause = !!(rx_ppp || tx_ppp) ? 0 : prof->rx_pause;
+		tx_pause = !!(rx_ppp || tx_ppp) ? 0 : prof->tx_pause;
 	} else {
-		priv->prof->rx_pause = 1;
-		priv->prof->tx_pause = 1;
-		en_dbg(DRV, priv, "Set pfc off\n");
+		rx_ppp = 0;
+		tx_ppp = 0;
+		rx_pause = prof->rx_pause;
+		tx_pause = prof->tx_pause;
 	}
 
 	if (mlx4_SET_PORT_general(mdev->dev, priv->port,
 				  priv->rx_skb_size + ETH_FCS_LEN,
-				  priv->prof->tx_pause,
-				  priv->prof->tx_ppp,
-				  priv->prof->rx_pause,
-				  priv->prof->rx_ppp)) {
+				  tx_pause, tx_ppp, rx_pause, rx_ppp)) {
 		en_err(priv, "Failed setting pause params\n");
 		return 1;
 	}
 
+	prof->tx_ppp = tx_ppp;
+	prof->rx_ppp = rx_ppp;
+	prof->tx_pause = tx_pause;
+	prof->rx_pause = rx_pause;
+
 	return 0;
 }
 
@@ -408,6 +414,7 @@ static int mlx4_en_dcbnl_ieee_setpfc(struct net_device *dev,
 	struct mlx4_en_priv *priv = netdev_priv(dev);
 	struct mlx4_en_port_profile *prof = priv->prof;
 	struct mlx4_en_dev *mdev = priv->mdev;
+	u32 tx_pause, tx_ppp, rx_pause, rx_ppp;
 	int err;
 
 	en_dbg(DRV, priv, "cap: 0x%x en: 0x%x mbc: 0x%x delay: %d\n",
@@ -416,23 +423,26 @@ static int mlx4_en_dcbnl_ieee_setpfc(struct net_device *dev,
 			pfc->mbc,
 			pfc->delay);
 
-	prof->rx_pause = !pfc->pfc_en;
-	prof->tx_pause = !pfc->pfc_en;
-	prof->rx_ppp = pfc->pfc_en;
-	prof->tx_ppp = pfc->pfc_en;
+	rx_pause = prof->rx_pause && !pfc->pfc_en;
+	tx_pause = prof->tx_pause && !pfc->pfc_en;
+	rx_ppp = pfc->pfc_en;
+	tx_ppp = pfc->pfc_en;
 
 	err = mlx4_SET_PORT_general(mdev->dev, priv->port,
 				    priv->rx_skb_size + ETH_FCS_LEN,
-				    prof->tx_pause,
-				    prof->tx_ppp,
-				    prof->rx_pause,
-				    prof->rx_ppp);
-	if (err)
+				    tx_pause, tx_ppp, rx_pause, rx_ppp);
+	if (err) {
 		en_err(priv, "Failed setting pause params\n");
-	else
-		mlx4_en_update_pfc_stats_bitmap(mdev->dev, &priv->stats_bitmap,
-						prof->rx_ppp, prof->rx_pause,
-						prof->tx_ppp, prof->tx_pause);
+		return err;
+	}
+
+	mlx4_en_update_pfc_stats_bitmap(mdev->dev, &priv->stats_bitmap,
+					rx_ppp, rx_pause, tx_ppp, tx_pause);
+
+	prof->tx_ppp = tx_ppp;
+	prof->rx_ppp = rx_ppp;
+	prof->rx_pause = rx_pause;
+	prof->tx_pause = tx_pause;
 
 	return err;
 }