net/mlx5: Allow/disallow LAG according to pre-req only

Remove the lag forbid/allow functions, change the lag prereq check to
run in the do-bond logic, so every change in the prereq state will
cause LAG to be disabled/enabled accordingly after the next do-bond run.

Add lag update function, so every component which changes the prereq
state and want the LAG to re-calc the conditions can call the update
function.

Signed-off-by: Rabie Loulou <[email protected]>
Signed-off-by: Aviv Heller <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: Rabie Loulou

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

@@ -1632,6 +1632,8 @@ int mlx5_eswitch_enable_sriov(struct mlx5_eswitch *esw, int nvfs, int mode)
 	esw_info(esw->dev, "E-Switch enable SRIOV: nvfs(%d) mode (%d)\n", nvfs, mode);
 	esw->mode = mode;
 
+	mlx5_lag_update(esw->dev);
+
 	if (mode == SRIOV_LEGACY) {
 		err = esw_create_legacy_fdb_table(esw);
 	} else {
@@ -1708,6 +1710,8 @@ void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw)
 	old_mode = esw->mode;
 	esw->mode = SRIOV_NONE;
 
+	mlx5_lag_update(esw->dev);
+
 	if (old_mode == SRIOV_OFFLOADS)
 		mlx5_reload_interface(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
 }
@@ -2225,3 +2229,12 @@ u8 mlx5_eswitch_mode(struct mlx5_eswitch *esw)
 	return ESW_ALLOWED(esw) ? esw->mode : SRIOV_NONE;
 }
 EXPORT_SYMBOL_GPL(mlx5_eswitch_mode);
+
+bool mlx5_esw_lag_prereq(struct mlx5_core_dev *dev0, struct mlx5_core_dev *dev1)
+{
+	if (dev0->priv.eswitch->mode == SRIOV_NONE &&
+	    dev1->priv.eswitch->mode == SRIOV_NONE)
+		return true;
+
+	return false;
+}

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -351,6 +351,9 @@ static inline bool mlx5_eswitch_vlan_actions_supported(struct mlx5_core_dev *dev
 		MLX5_CAP_ESW_FLOWTABLE_FDB(dev, push_vlan_2);
 }
 
+bool mlx5_esw_lag_prereq(struct mlx5_core_dev *dev0,
+			 struct mlx5_core_dev *dev1);
+
 #define MLX5_DEBUG_ESWITCH_MASK BIT(3)
 
 #define esw_info(dev, format, ...)				\
@@ -367,6 +370,7 @@ static inline int  mlx5_eswitch_init(struct mlx5_core_dev *dev) { return 0; }
 static inline void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw) {}
 static inline int  mlx5_eswitch_enable_sriov(struct mlx5_eswitch *esw, int nvfs, int mode) { return 0; }
 static inline void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw) {}
+static inline bool mlx5_esw_lag_prereq(struct mlx5_core_dev *dev0, struct mlx5_core_dev *dev1) { return true; }
 
 #define FDB_MAX_CHAIN 1
 #define FDB_SLOW_PATH_CHAIN (FDB_MAX_CHAIN + 1)

drivers/net/ethernet/mellanox/mlx5/core/lag.c

@@ -62,11 +62,6 @@ struct mlx5_lag {
 	struct lag_tracker        tracker;
 	struct delayed_work       bond_work;
 	struct notifier_block     nb;
-
-	/* Admin state. Allow lag only if allowed is true
-	 * even if network conditions for lag were met
-	 */
-	bool                      allowed;
 };
 
 /* General purpose, use for short periods of time.
@@ -254,6 +249,16 @@ static void mlx5_deactivate_lag(struct mlx5_lag *ldev)
 			      err);
 }
 
+static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
+{
+	if (ldev->pf[0].dev &&
+	    ldev->pf[1].dev &&
+	    mlx5_esw_lag_prereq(ldev->pf[0].dev, ldev->pf[1].dev))
+		return true;
+	else
+		return false;
+}
+
 static void mlx5_do_bond(struct mlx5_lag *ldev)
 {
 	struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
@@ -271,7 +276,7 @@ static void mlx5_do_bond(struct mlx5_lag *ldev)
 	tracker = ldev->tracker;
 	mutex_unlock(&lag_mutex);
 
-	do_bond = tracker.is_bonded && ldev->allowed;
+	do_bond = tracker.is_bonded && mlx5_lag_check_prereq(ldev);
 
 	if (do_bond && !mlx5_lag_is_bonded(ldev)) {
 		if (!sriov_enabled)
@@ -449,15 +454,6 @@ static int mlx5_lag_netdev_event(struct notifier_block *this,
 	return NOTIFY_DONE;
 }
 
-static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
-{
-	if ((ldev->pf[0].dev && mlx5_sriov_is_enabled(ldev->pf[0].dev)) ||
-	    (ldev->pf[1].dev && mlx5_sriov_is_enabled(ldev->pf[1].dev)))
-		return false;
-	else
-		return true;
-}
-
 static struct mlx5_lag *mlx5_lag_dev_alloc(void)
 {
 	struct mlx5_lag *ldev;
@@ -467,7 +463,6 @@ static struct mlx5_lag *mlx5_lag_dev_alloc(void)
 		return NULL;
 
 	INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);
-	ldev->allowed = mlx5_lag_check_prereq(ldev);
 
 	return ldev;
 }
@@ -492,7 +487,6 @@ static void mlx5_lag_dev_add_pf(struct mlx5_lag *ldev,
 	ldev->tracker.netdev_state[fn].link_up = 0;
 	ldev->tracker.netdev_state[fn].tx_enabled = 0;
 
-	ldev->allowed = mlx5_lag_check_prereq(ldev);
 	dev->priv.lag = ldev;
 
 	mutex_unlock(&lag_mutex);
@@ -514,7 +508,6 @@ static void mlx5_lag_dev_remove_pf(struct mlx5_lag *ldev,
 	memset(&ldev->pf[i], 0, sizeof(*ldev->pf));
 
 	dev->priv.lag = NULL;
-	ldev->allowed = mlx5_lag_check_prereq(ldev);
 	mutex_unlock(&lag_mutex);
 }
 
@@ -593,42 +586,19 @@ bool mlx5_lag_is_active(struct mlx5_core_dev *dev)
 }
 EXPORT_SYMBOL(mlx5_lag_is_active);
 
-static int mlx5_lag_set_state(struct mlx5_core_dev *dev, bool allow)
+void mlx5_lag_update(struct mlx5_core_dev *dev)
 {
 	struct mlx5_lag *ldev;
-	int ret = 0;
-	bool lag_active;
 
 	mlx5_dev_list_lock();
-
 	ldev = mlx5_lag_dev_get(dev);
-	if (!ldev) {
-		ret = -ENODEV;
-		goto unlock;
-	}
-	lag_active = mlx5_lag_is_bonded(ldev);
-	if (!mlx5_lag_check_prereq(ldev) && allow) {
-		ret = -EINVAL;
-		goto unlock;
-	}
-	if (ldev->allowed == allow)
+	if (!ldev)
 		goto unlock;
-	ldev->allowed = allow;
-	if ((lag_active && !allow) || allow)
-		mlx5_do_bond(ldev);
-unlock:
-	mlx5_dev_list_unlock();
-	return ret;
-}
 
-int mlx5_lag_forbid(struct mlx5_core_dev *dev)
-{
-	return mlx5_lag_set_state(dev, false);
-}
+	mlx5_do_bond(ldev);
 
-int mlx5_lag_allow(struct mlx5_core_dev *dev)
-{
-	return mlx5_lag_set_state(dev, true);
+unlock:
+	mlx5_dev_list_unlock();
 }
 
 struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev)

drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h

@@ -185,10 +185,8 @@ static inline int mlx5_lag_is_lacp_owner(struct mlx5_core_dev *dev)
 		    MLX5_CAP_GEN(dev, lag_master);
 }
 
-int mlx5_lag_allow(struct mlx5_core_dev *dev);
-int mlx5_lag_forbid(struct mlx5_core_dev *dev);
-
 void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol);
+void mlx5_lag_update(struct mlx5_core_dev *dev);
 
 enum {
 	MLX5_NIC_IFC_FULL		= 0,

drivers/net/ethernet/mellanox/mlx5/core/sriov.c

@@ -216,20 +216,10 @@ int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
 	if (!mlx5_core_is_pf(dev))
 		return -EPERM;
 
-	if (num_vfs) {
-		int ret;
-
-		ret = mlx5_lag_forbid(dev);
-		if (ret && (ret != -ENODEV))
-			return ret;
-	}
-
-	if (num_vfs) {
+	if (num_vfs)
 		err = mlx5_sriov_enable(pdev, num_vfs);
-	} else {
+	else
 		mlx5_sriov_disable(pdev);
-		mlx5_lag_allow(dev);
-	}
 
 	return err ? err : num_vfs;
 }