Commit 0636f4de authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

mlxsw: spectrum_buffers: Add ability to veto pool's configuration 



Subsequent patches are going to need to veto changes in certain pools'
size and / or threshold type (mode).

Add two fields to the pool's struct that indicate if either of these
attributes is allowed to change and enforce that.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Reviewed-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 93d3668c

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

+16 −1
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
struct mlxsw_sp_sb_pr {

	enum mlxsw_reg_sbpr_mode mode;

	u32 size;

	u8 freeze_mode:1,

	   freeze_size:1;

};



struct mlxsw_cp_sb_occ {
@@ -932,14 +934,27 @@ int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core, 
{

	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);

	u32 pool_size = mlxsw_sp_bytes_cells(mlxsw_sp, size);

	const struct mlxsw_sp_sb_pr *pr;

	enum mlxsw_reg_sbpr_mode mode;



	mode = (enum mlxsw_reg_sbpr_mode) threshold_type;

	pr = &mlxsw_sp->sb_vals->prs[pool_index];



	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;

	if (pr->freeze_mode && pr->mode != mode) {

		NL_SET_ERR_MSG_MOD(extack, "Changing this pool's threshold type is forbidden");

		return -EINVAL;

	};



	if (pr->freeze_size && pr->size != size) {

		NL_SET_ERR_MSG_MOD(extack, "Changing this pool's size is forbidden");

		return -EINVAL;

	};



	return mlxsw_sp_sb_pr_write(mlxsw_sp, pool_index, mode,

				    pool_size, false);

}

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