mlxsw: spectrum_acl: Introduce Bloom filter

Lay the foundations for Bloom filter handling. Introduce a new file for
Bloom filter actions.

Add struct mlxsw_sp_acl_bf to struct mlxsw_sp_acl_erp_core and initialize
the Bloom filter data structure. Also take care of proper destruction when
terminating.

Signed-off-by: Nir Dotan <nird@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c
new file mode 100644
index 000000000000..4685b730e703
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
+
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/refcount.h>
+
+#include "spectrum.h"
+#include "spectrum_acl_tcam.h"
+
+struct mlxsw_sp_acl_bf {
+	unsigned int bank_size;
+	refcount_t refcnt[0];
+};
+
+struct mlxsw_sp_acl_bf *
+mlxsw_sp_acl_bf_init(struct mlxsw_sp *mlxsw_sp, unsigned int num_erp_banks)
+{
+	struct mlxsw_sp_acl_bf *bf;
+	unsigned int bf_bank_size;
+
+	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, ACL_MAX_BF_LOG))
+		return ERR_PTR(-EIO);
+
+	/* Bloom filter size per erp_table_bank
+	 * is 2^ACL_MAX_BF_LOG
+	 */
+	bf_bank_size = 1 << MLXSW_CORE_RES_GET(mlxsw_sp->core, ACL_MAX_BF_LOG);
+	bf = kzalloc(sizeof(*bf) + bf_bank_size * num_erp_banks *
+		     sizeof(*bf->refcnt), GFP_KERNEL);
+	if (!bf)
+		return ERR_PTR(-ENOMEM);
+
+	bf->bank_size = bf_bank_size;
+	return bf;
+}
+
+void mlxsw_sp_acl_bf_fini(struct mlxsw_sp_acl_bf *bf)
+{
+	kfree(bf);
+}