1 files changed, 253 insertions, 109 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
index c33beac5def0..273300b75a68 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
@@ -41,6 +41,138 @@
 #include "spectrum.h"
 #include "reg.h"
 
+enum mlxsw_sp_qdisc_type {
+	MLXSW_SP_QDISC_NO_QDISC,
+	MLXSW_SP_QDISC_RED,
+};
+
+struct mlxsw_sp_qdisc_ops {
+	enum mlxsw_sp_qdisc_type type;
+	int (*check_params)(struct mlxsw_sp_port *mlxsw_sp_port,
+			    struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			    void *params);
+	int (*replace)(struct mlxsw_sp_port *mlxsw_sp_port,
+		       struct mlxsw_sp_qdisc *mlxsw_sp_qdisc, void *params);
+	int (*destroy)(struct mlxsw_sp_port *mlxsw_sp_port,
+		       struct mlxsw_sp_qdisc *mlxsw_sp_qdisc);
+	int (*get_stats)(struct mlxsw_sp_port *mlxsw_sp_port,
+			 struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			 struct tc_qopt_offload_stats *stats_ptr);
+	int (*get_xstats)(struct mlxsw_sp_port *mlxsw_sp_port,
+			  struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			  void *xstats_ptr);
+	void (*clean_stats)(struct mlxsw_sp_port *mlxsw_sp_port,
+			    struct mlxsw_sp_qdisc *mlxsw_sp_qdisc);
+};
+
+struct mlxsw_sp_qdisc {
+	u32 handle;
+	u8 tclass_num;
+	union {
+		struct red_stats red;
+	} xstats_base;
+	struct mlxsw_sp_qdisc_stats {
+		u64 tx_bytes;
+		u64 tx_packets;
+		u64 drops;
+		u64 overlimits;
+	} stats_base;
+
+	struct mlxsw_sp_qdisc_ops *ops;
+};
+
+static bool
+mlxsw_sp_qdisc_compare(struct mlxsw_sp_qdisc *mlxsw_sp_qdisc, u32 handle,
+		       enum mlxsw_sp_qdisc_type type)
+{
+	return mlxsw_sp_qdisc && mlxsw_sp_qdisc->ops &&
+	       mlxsw_sp_qdisc->ops->type == type &&
+	       mlxsw_sp_qdisc->handle == handle;
+}
+
+static int
+mlxsw_sp_qdisc_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
+		       struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
+{
+	int err = 0;
+
+	if (!mlxsw_sp_qdisc)
+		return 0;
+
+	if (mlxsw_sp_qdisc->ops && mlxsw_sp_qdisc->ops->destroy)
+		err = mlxsw_sp_qdisc->ops->destroy(mlxsw_sp_port,
+						   mlxsw_sp_qdisc);
+
+	mlxsw_sp_qdisc->handle = TC_H_UNSPEC;
+	mlxsw_sp_qdisc->ops = NULL;
+	return err;
+}
+
+static int
+mlxsw_sp_qdisc_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
+		       struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+		       struct mlxsw_sp_qdisc_ops *ops, void *params)
+{
+	int err;
+
+	if (mlxsw_sp_qdisc->ops && mlxsw_sp_qdisc->ops->type != ops->type)
+		/* In case this location contained a different qdisc of the
+		 * same type we can override the old qdisc configuration.
+		 * Otherwise, we need to remove the old qdisc before setting the
+		 * new one.
+		 */
+		mlxsw_sp_qdisc_destroy(mlxsw_sp_port, mlxsw_sp_qdisc);
+	err = ops->check_params(mlxsw_sp_port, mlxsw_sp_qdisc, params);
+	if (err)
+		goto err_bad_param;
+
+	err = ops->replace(mlxsw_sp_port, mlxsw_sp_qdisc, params);
+	if (err)
+		goto err_config;
+
+	if (mlxsw_sp_qdisc->handle != handle) {
+		mlxsw_sp_qdisc->ops = ops;
+		if (ops->clean_stats)
+			ops->clean_stats(mlxsw_sp_port, mlxsw_sp_qdisc);
+	}
+
+	mlxsw_sp_qdisc->handle = handle;
+	return 0;
+
+err_bad_param:
+err_config:
+	mlxsw_sp_qdisc_destroy(mlxsw_sp_port, mlxsw_sp_qdisc);
+	return err;
+}
+
+static int
+mlxsw_sp_qdisc_get_stats(struct mlxsw_sp_port *mlxsw_sp_port,
+			 struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			 struct tc_qopt_offload_stats *stats_ptr)
+{
+	if (mlxsw_sp_qdisc && mlxsw_sp_qdisc->ops &&
+	    mlxsw_sp_qdisc->ops->get_stats)
+		return mlxsw_sp_qdisc->ops->get_stats(mlxsw_sp_port,
+						      mlxsw_sp_qdisc,
+						      stats_ptr);
+
+	return -EOPNOTSUPP;
+}
+
+static int
+mlxsw_sp_qdisc_get_xstats(struct mlxsw_sp_port *mlxsw_sp_port,
+			  struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			  void *xstats_ptr)
+{
+	if (mlxsw_sp_qdisc && mlxsw_sp_qdisc->ops &&
+	    mlxsw_sp_qdisc->ops->get_xstats)
+		return mlxsw_sp_qdisc->ops->get_xstats(mlxsw_sp_port,
+						      mlxsw_sp_qdisc,
+						      xstats_ptr);
+
+	return -EOPNOTSUPP;
+}
+
 static int
 mlxsw_sp_tclass_congestion_enable(struct mlxsw_sp_port *mlxsw_sp_port,
 				  int tclass_num, u32 min, u32 max,
@@ -79,80 +211,76 @@ mlxsw_sp_tclass_congestion_disable(struct mlxsw_sp_port *mlxsw_sp_port,
 }
 
 static void
-mlxsw_sp_setup_tc_qdisc_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
-				    struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
-				    int tclass_num)
+mlxsw_sp_setup_tc_qdisc_red_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
+					struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
 {
-	struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base;
+	u8 tclass_num = mlxsw_sp_qdisc->tclass_num;
+	struct mlxsw_sp_qdisc_stats *stats_base;
 	struct mlxsw_sp_port_xstats *xstats;
 	struct rtnl_link_stats64 *stats;
+	struct red_stats *red_base;
 
 	xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
 	stats = &mlxsw_sp_port->periodic_hw_stats.stats;
+	stats_base = &mlxsw_sp_qdisc->stats_base;
+	red_base = &mlxsw_sp_qdisc->xstats_base.red;
 
-	mlxsw_sp_qdisc->tx_packets = stats->tx_packets;
-	mlxsw_sp_qdisc->tx_bytes = stats->tx_bytes;
+	stats_base->tx_packets = stats->tx_packets;
+	stats_base->tx_bytes = stats->tx_bytes;
 
-	switch (mlxsw_sp_qdisc->type) {
-	case MLXSW_SP_QDISC_RED:
-		xstats_base->prob_mark = xstats->ecn;
-		xstats_base->prob_drop = xstats->wred_drop[tclass_num];
-		xstats_base->pdrop = xstats->tail_drop[tclass_num];
+	red_base->prob_mark = xstats->ecn;
+	red_base->prob_drop = xstats->wred_drop[tclass_num];
+	red_base->pdrop = xstats->tail_drop[tclass_num];
 
-		mlxsw_sp_qdisc->overlimits = xstats_base->prob_drop +
-					     xstats_base->prob_mark;
-		mlxsw_sp_qdisc->drops = xstats_base->prob_drop +
-					xstats_base->pdrop;
-		break;
-	default:
-		break;
-	}
+	stats_base->overlimits = red_base->prob_drop + red_base->prob_mark;
+	stats_base->drops = red_base->prob_drop + red_base->pdrop;
 }
 
 static int
-mlxsw_sp_qdisc_red_destroy(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
-			   struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
-			   int tclass_num)
+mlxsw_sp_qdisc_red_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
+			   struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
 {
-	int err;
-
-	if (mlxsw_sp_qdisc->handle != handle)
-		return 0;
-
-	err = mlxsw_sp_tclass_congestion_disable(mlxsw_sp_port, tclass_num);
-	mlxsw_sp_qdisc->handle = TC_H_UNSPEC;
-	mlxsw_sp_qdisc->type = MLXSW_SP_QDISC_NO_QDISC;
-
-	return err;
+	return mlxsw_sp_tclass_congestion_disable(mlxsw_sp_port,
+						  mlxsw_sp_qdisc->tclass_num);
 }
 
 static int
-mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
-			   struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
-			   int tclass_num,
-			   struct tc_red_qopt_offload_params *p)
+mlxsw_sp_qdisc_red_check_params(struct mlxsw_sp_port *mlxsw_sp_port,
+				struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+				void *params)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
-	u32 min, max;
-	u64 prob;
-	int err = 0;
+	struct tc_red_qopt_offload_params *p = params;
 
 	if (p->min > p->max) {
 		dev_err(mlxsw_sp->bus_info->dev,
 			"spectrum: RED: min %u is bigger then max %u\n", p->min,
 			p->max);
-		goto err_bad_param;
+		return -EINVAL;
 	}
 	if (p->max > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE)) {
 		dev_err(mlxsw_sp->bus_info->dev,
 			"spectrum: RED: max value %u is too big\n", p->max);
-		goto err_bad_param;
+		return -EINVAL;
 	}
 	if (p->min == 0 || p->max == 0) {
 		dev_err(mlxsw_sp->bus_info->dev,
 			"spectrum: RED: 0 value is illegal for min and max\n");
-		goto err_bad_param;
+		return -EINVAL;
 	}
+	return 0;
+}
+
+static int
+mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port,
+			   struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
+			   void *params)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct tc_red_qopt_offload_params *p = params;
+	u8 tclass_num = mlxsw_sp_qdisc->tclass_num;
+	u32 min, max;
+	u64 prob;
 
 	/* calculate probability in percentage */
 	prob = p->probability;
@@ -161,116 +289,132 @@ mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
 	prob = DIV_ROUND_UP(prob, 1 << 16);
 	min = mlxsw_sp_bytes_cells(mlxsw_sp, p->min);
 	max = mlxsw_sp_bytes_cells(mlxsw_sp, p->max);
-	err = mlxsw_sp_tclass_congestion_enable(mlxsw_sp_port, tclass_num, min,
-						max, prob, p->is_ecn);
-	if (err)
-		goto err_config;
-
-	mlxsw_sp_qdisc->type = MLXSW_SP_QDISC_RED;
-	if (mlxsw_sp_qdisc->handle != handle)
-		mlxsw_sp_setup_tc_qdisc_clean_stats(mlxsw_sp_port,
-						    mlxsw_sp_qdisc,
-						    tclass_num);
-
-	mlxsw_sp_qdisc->handle = handle;
-	return 0;
-
-err_bad_param:
-	err = -EINVAL;
-err_config:
-	mlxsw_sp_qdisc_red_destroy(mlxsw_sp_port, mlxsw_sp_qdisc->handle,
-				   mlxsw_sp_qdisc, tclass_num);
-	return err;
+	return mlxsw_sp_tclass_congestion_enable(mlxsw_sp_port, tclass_num, min,
+						 max, prob, p->is_ecn);
 }
 
 static int
-mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
+mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port,
 			      struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
-			      int tclass_num, struct red_stats *res)
+			      void *xstats_ptr)
 {
-	struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base;
+	struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base.red;
+	u8 tclass_num = mlxsw_sp_qdisc->tclass_num;
 	struct mlxsw_sp_port_xstats *xstats;
-
-	if (mlxsw_sp_qdisc->handle != handle ||
-	    mlxsw_sp_qdisc->type != MLXSW_SP_QDISC_RED)
-		return -EOPNOTSUPP;
+	struct red_stats *res = xstats_ptr;
+	int early_drops, marks, pdrops;
 
 	xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
 
-	res->prob_drop = xstats->wred_drop[tclass_num] - xstats_base->prob_drop;
-	res->prob_mark = xstats->ecn - xstats_base->prob_mark;
-	res->pdrop = xstats->tail_drop[tclass_num] - xstats_base->pdrop;
+	early_drops = xstats->wred_drop[tclass_num] - xstats_base->prob_drop;
+	marks = xstats->ecn - xstats_base->prob_mark;
+	pdrops = xstats->tail_drop[tclass_num] - xstats_base->pdrop;
+
+	res->pdrop += pdrops;
+	res->prob_drop += early_drops;
+	res->prob_mark += marks;
+
+	xstats_base->pdrop += pdrops;
+	xstats_base->prob_drop += early_drops;
+	xstats_base->prob_mark += marks;
 	return 0;
 }
 
 static int
-mlxsw_sp_qdisc_get_red_stats(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
+mlxsw_sp_qdisc_get_red_stats(struct mlxsw_sp_port *mlxsw_sp_port,
 			     struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
-			     int tclass_num,
-			     struct tc_red_qopt_offload_stats *res)
+			     struct tc_qopt_offload_stats *stats_ptr)
 {
 	u64 tx_bytes, tx_packets, overlimits, drops;
+	u8 tclass_num = mlxsw_sp_qdisc->tclass_num;
+	struct mlxsw_sp_qdisc_stats *stats_base;
 	struct mlxsw_sp_port_xstats *xstats;
 	struct rtnl_link_stats64 *stats;
 
-	if (mlxsw_sp_qdisc->handle != handle ||
-	    mlxsw_sp_qdisc->type != MLXSW_SP_QDISC_RED)
-		return -EOPNOTSUPP;
-
 	xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
 	stats = &mlxsw_sp_port->periodic_hw_stats.stats;
+	stats_base = &mlxsw_sp_qdisc->stats_base;
 
-	tx_bytes = stats->tx_bytes - mlxsw_sp_qdisc->tx_bytes;
-	tx_packets = stats->tx_packets - mlxsw_sp_qdisc->tx_packets;
+	tx_bytes = stats->tx_bytes - stats_base->tx_bytes;
+	tx_packets = stats->tx_packets - stats_base->tx_packets;
 	overlimits = xstats->wred_drop[tclass_num] + xstats->ecn -
-		     mlxsw_sp_qdisc->overlimits;
+		     stats_base->overlimits;
 	drops = xstats->wred_drop[tclass_num] + xstats->tail_drop[tclass_num] -
-		mlxsw_sp_qdisc->drops;
-
-	_bstats_update(res->bstats, tx_bytes, tx_packets);
-	res->qstats->overlimits += overlimits;
-	res->qstats->drops += drops;
-	res->qstats->backlog += mlxsw_sp_cells_bytes(mlxsw_sp_port->mlxsw_sp,
-						xstats->backlog[tclass_num]);
-
-	mlxsw_sp_qdisc->drops +=  drops;
-	mlxsw_sp_qdisc->overlimits += overlimits;
-	mlxsw_sp_qdisc->tx_bytes += tx_bytes;
-	mlxsw_sp_qdisc->tx_packets += tx_packets;
+		stats_base->drops;
+
+	_bstats_update(stats_ptr->bstats, tx_bytes, tx_packets);
+	stats_ptr->qstats->overlimits += overlimits;
+	stats_ptr->qstats->drops += drops;
+	stats_ptr->qstats->backlog +=
+			mlxsw_sp_cells_bytes(mlxsw_sp_port->mlxsw_sp,
+					     xstats->backlog[tclass_num]);
+
+	stats_base->drops +=  drops;
+	stats_base->overlimits += overlimits;
+	stats_base->tx_bytes += tx_bytes;
+	stats_base->tx_packets += tx_packets;
 	return 0;
 }
 
 #define MLXSW_SP_PORT_DEFAULT_TCLASS 0
 
+static struct mlxsw_sp_qdisc_ops mlxsw_sp_qdisc_ops_red = {
+	.type = MLXSW_SP_QDISC_RED,
+	.check_params = mlxsw_sp_qdisc_red_check_params,
+	.replace = mlxsw_sp_qdisc_red_replace,
+	.destroy = mlxsw_sp_qdisc_red_destroy,
+	.get_stats = mlxsw_sp_qdisc_get_red_stats,
+	.get_xstats = mlxsw_sp_qdisc_get_red_xstats,
+	.clean_stats = mlxsw_sp_setup_tc_qdisc_red_clean_stats,
+};
+
 int mlxsw_sp_setup_tc_red(struct mlxsw_sp_port *mlxsw_sp_port,
 			  struct tc_red_qopt_offload *p)
 {
 	struct mlxsw_sp_qdisc *mlxsw_sp_qdisc;
-	int tclass_num;
 
 	if (p->parent != TC_H_ROOT)
 		return -EOPNOTSUPP;
 
-	mlxsw_sp_qdisc = &mlxsw_sp_port->root_qdisc;
-	tclass_num = MLXSW_SP_PORT_DEFAULT_TCLASS;
+	mlxsw_sp_qdisc = mlxsw_sp_port->root_qdisc;
+
+	if (p->command == TC_RED_REPLACE)
+		return mlxsw_sp_qdisc_replace(mlxsw_sp_port, p->handle,
+					      mlxsw_sp_qdisc,
+					      &mlxsw_sp_qdisc_ops_red,
+					      &p->set);
+
+	if (!mlxsw_sp_qdisc_compare(mlxsw_sp_qdisc, p->handle,
+				    MLXSW_SP_QDISC_RED))
+		return -EOPNOTSUPP;
 
 	switch (p->command) {
-	case TC_RED_REPLACE:
-		return mlxsw_sp_qdisc_red_replace(mlxsw_sp_port, p->handle,
-						  mlxsw_sp_qdisc, tclass_num,
-						  &p->set);
 	case TC_RED_DESTROY:
-		return mlxsw_sp_qdisc_red_destroy(mlxsw_sp_port, p->handle,
-						  mlxsw_sp_qdisc, tclass_num);
+		return mlxsw_sp_qdisc_destroy(mlxsw_sp_port, mlxsw_sp_qdisc);
 	case TC_RED_XSTATS:
-		return mlxsw_sp_qdisc_get_red_xstats(mlxsw_sp_port, p->handle,
-						     mlxsw_sp_qdisc, tclass_num,
-						     p->xstats);
+		return mlxsw_sp_qdisc_get_xstats(mlxsw_sp_port, mlxsw_sp_qdisc,
+						 p->xstats);
 	case TC_RED_STATS:
-		return mlxsw_sp_qdisc_get_red_stats(mlxsw_sp_port, p->handle,
-						    mlxsw_sp_qdisc, tclass_num,
-						    &p->stats);
+		return mlxsw_sp_qdisc_get_stats(mlxsw_sp_port, mlxsw_sp_qdisc,
+						&p->stats);
 	default:
 		return -EOPNOTSUPP;
 	}
 }
+
+int mlxsw_sp_tc_qdisc_init(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+	mlxsw_sp_port->root_qdisc = kzalloc(sizeof(*mlxsw_sp_port->root_qdisc),
+					    GFP_KERNEL);
+	if (!mlxsw_sp_port->root_qdisc)
+		return -ENOMEM;
+
+	mlxsw_sp_port->root_qdisc->tclass_num = MLXSW_SP_PORT_DEFAULT_TCLASS;
+
+	return 0;
+}
+
+void mlxsw_sp_tc_qdisc_fini(struct mlxsw_sp_port *mlxsw_sp_port)
+{
+	kfree(mlxsw_sp_port->root_qdisc);
+}