mlxsw: spectrum_buffers: Add extack messages for invalid configurations

Add extack messages to better communicate invalid configuration to the
user.

Example:

# devlink sb pool set pci/0000:01:00.0 pool 0 size 104857600 thtype dynamic
Error: mlxsw_spectrum: Exceeded shared buffer size.
devlink answers: Invalid argument
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/core.c

@@ -790,7 +790,8 @@ mlxsw_devlink_sb_pool_set(struct devlink *devlink,
 	if (!mlxsw_driver->sb_pool_set)
 		return -EOPNOTSUPP;
 	return mlxsw_driver->sb_pool_set(mlxsw_core, sb_index,
-					 pool_index, size, threshold_type);
+					 pool_index, size, threshold_type,
+					 extack);
 }
 
 static void *__dl_port(struct devlink_port *devlink_port)
@@ -841,7 +842,7 @@ static int mlxsw_devlink_sb_port_pool_set(struct devlink_port *devlink_port,
 	    !mlxsw_core_port_check(mlxsw_core_port))
 		return -EOPNOTSUPP;
 	return mlxsw_driver->sb_port_pool_set(mlxsw_core_port, sb_index,
-					      pool_index, threshold);
+					      pool_index, threshold, extack);
 }
 
 static int
@@ -878,7 +879,7 @@ mlxsw_devlink_sb_tc_pool_bind_set(struct devlink_port *devlink_port,
 		return -EOPNOTSUPP;
 	return mlxsw_driver->sb_tc_pool_bind_set(mlxsw_core_port, sb_index,
 						 tc_index, pool_type,
-						 pool_index, threshold);
+						 pool_index, threshold, extack);
 }
 
 static int mlxsw_devlink_sb_occ_snapshot(struct devlink *devlink,

drivers/net/ethernet/mellanox/mlxsw/core.h

@@ -254,13 +254,14 @@ struct mlxsw_driver {
 			   struct devlink_sb_pool_info *pool_info);
 	int (*sb_pool_set)(struct mlxsw_core *mlxsw_core,
 			   unsigned int sb_index, u16 pool_index, u32 size,
-			   enum devlink_sb_threshold_type threshold_type);
+			   enum devlink_sb_threshold_type threshold_type,
+			   struct netlink_ext_ack *extack);
 	int (*sb_port_pool_get)(struct mlxsw_core_port *mlxsw_core_port,
 				unsigned int sb_index, u16 pool_index,
 				u32 *p_threshold);
 	int (*sb_port_pool_set)(struct mlxsw_core_port *mlxsw_core_port,
 				unsigned int sb_index, u16 pool_index,
-				u32 threshold);
+				u32 threshold, struct netlink_ext_ack *extack);
 	int (*sb_tc_pool_bind_get)(struct mlxsw_core_port *mlxsw_core_port,
 				   unsigned int sb_index, u16 tc_index,
 				   enum devlink_sb_pool_type pool_type,
@@ -268,7 +269,8 @@ struct mlxsw_driver {
 	int (*sb_tc_pool_bind_set)(struct mlxsw_core_port *mlxsw_core_port,
 				   unsigned int sb_index, u16 tc_index,
 				   enum devlink_sb_pool_type pool_type,
-				   u16 pool_index, u32 threshold);
+				   u16 pool_index, u32 threshold,
+				   struct netlink_ext_ack *extack);
 	int (*sb_occ_snapshot)(struct mlxsw_core *mlxsw_core,
 			       unsigned int sb_index);
 	int (*sb_occ_max_clear)(struct mlxsw_core *mlxsw_core,

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -371,13 +371,14 @@ int mlxsw_sp_sb_pool_get(struct mlxsw_core *mlxsw_core,
 			 struct devlink_sb_pool_info *pool_info);
 int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,
 			 unsigned int sb_index, u16 pool_index, u32 size,
-			 enum devlink_sb_threshold_type threshold_type);
+			 enum devlink_sb_threshold_type threshold_type,
+			 struct netlink_ext_ack *extack);
 int mlxsw_sp_sb_port_pool_get(struct mlxsw_core_port *mlxsw_core_port,
 			      unsigned int sb_index, u16 pool_index,
 			      u32 *p_threshold);
 int mlxsw_sp_sb_port_pool_set(struct mlxsw_core_port *mlxsw_core_port,
 			      unsigned int sb_index, u16 pool_index,
-			      u32 threshold);
+			      u32 threshold, struct netlink_ext_ack *extack);
 int mlxsw_sp_sb_tc_pool_bind_get(struct mlxsw_core_port *mlxsw_core_port,
 				 unsigned int sb_index, u16 tc_index,
 				 enum devlink_sb_pool_type pool_type,
@@ -385,7 +386,8 @@ int mlxsw_sp_sb_tc_pool_bind_get(struct mlxsw_core_port *mlxsw_core_port,
 int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,
 				 unsigned int sb_index, u16 tc_index,
 				 enum devlink_sb_pool_type pool_type,
-				 u16 pool_index, u32 threshold);
+				 u16 pool_index, u32 threshold,
+				 struct netlink_ext_ack *extack);
 int mlxsw_sp_sb_occ_snapshot(struct mlxsw_core *mlxsw_core,
 			     unsigned int sb_index);
 int mlxsw_sp_sb_occ_max_clear(struct mlxsw_core *mlxsw_core,

drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c

@@ -6,6 +6,7 @@
 #include <linux/dcbnl.h>
 #include <linux/if_ether.h>
 #include <linux/list.h>
+#include <linux/netlink.h>
 
 #include "spectrum.h"
 #include "core.h"
@@ -900,14 +901,17 @@ int mlxsw_sp_sb_pool_get(struct mlxsw_core *mlxsw_core,
 
 int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,
 			 unsigned int sb_index, u16 pool_index, u32 size,
-			 enum devlink_sb_threshold_type threshold_type)
+			 enum devlink_sb_threshold_type threshold_type,
+			 struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
 	u32 pool_size = mlxsw_sp_bytes_cells(mlxsw_sp, size);
 	enum mlxsw_reg_sbpr_mode mode;
 
-	if (size > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE))
+	if (size > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE)) {
+		NL_SET_ERR_MSG_MOD(extack, "Exceeded shared buffer size");
 		return -EINVAL;
+	}
 
 	mode = (enum mlxsw_reg_sbpr_mode) threshold_type;
 	return mlxsw_sp_sb_pr_write(mlxsw_sp, pool_index, mode,
@@ -927,7 +931,8 @@ static u32 mlxsw_sp_sb_threshold_out(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
 }
 
 static int mlxsw_sp_sb_threshold_in(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
-				    u32 threshold, u32 *p_max_buff)
+				    u32 threshold, u32 *p_max_buff,
+				    struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp_sb_pr *pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool_index);
 
@@ -936,8 +941,10 @@ static int mlxsw_sp_sb_threshold_in(struct mlxsw_sp *mlxsw_sp, u16 pool_index,
 
 		val = threshold + MLXSW_SP_SB_THRESHOLD_TO_ALPHA_OFFSET;
 		if (val < MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN ||
-		    val > MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX)
+		    val > MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX) {
+			NL_SET_ERR_MSG_MOD(extack, "Invalid dynamic threshold value");
 			return -EINVAL;
+		}
 		*p_max_buff = val;
 	} else {
 		*p_max_buff = mlxsw_sp_bytes_cells(mlxsw_sp, threshold);
@@ -963,7 +970,7 @@ int mlxsw_sp_sb_port_pool_get(struct mlxsw_core_port *mlxsw_core_port,
 
 int mlxsw_sp_sb_port_pool_set(struct mlxsw_core_port *mlxsw_core_port,
 			      unsigned int sb_index, u16 pool_index,
-			      u32 threshold)
+			      u32 threshold, struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp_port *mlxsw_sp_port =
 			mlxsw_core_port_driver_priv(mlxsw_core_port);
@@ -973,7 +980,7 @@ int mlxsw_sp_sb_port_pool_set(struct mlxsw_core_port *mlxsw_core_port,
 	int err;
 
 	err = mlxsw_sp_sb_threshold_in(mlxsw_sp, pool_index,
-				       threshold, &max_buff);
+				       threshold, &max_buff, extack);
 	if (err)
 		return err;
 
@@ -1004,7 +1011,8 @@ int mlxsw_sp_sb_tc_pool_bind_get(struct mlxsw_core_port *mlxsw_core_port,
 int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,
 				 unsigned int sb_index, u16 tc_index,
 				 enum devlink_sb_pool_type pool_type,
-				 u16 pool_index, u32 threshold)
+				 u16 pool_index, u32 threshold,
+				 struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp_port *mlxsw_sp_port =
 			mlxsw_core_port_driver_priv(mlxsw_core_port);
@@ -1015,11 +1023,13 @@ int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,
 	u32 max_buff;
 	int err;
 
-	if (dir != mlxsw_sp->sb_vals->pool_dess[pool_index].dir)
+	if (dir != mlxsw_sp->sb_vals->pool_dess[pool_index].dir) {
+		NL_SET_ERR_MSG_MOD(extack, "Binding egress TC to ingress pool and vice versa is forbidden");
 		return -EINVAL;
+	}
 
 	err = mlxsw_sp_sb_threshold_in(mlxsw_sp, pool_index,
-				       threshold, &max_buff);
+				       threshold, &max_buff, extack);
 	if (err)
 		return err;