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>

drivers/net/ethernet/mellanox/mlxsw/Makefile

@@ -20,7 +20,7 @@ mlxsw_spectrum-objs		:= spectrum.o spectrum_buffers.o \
 				   spectrum_acl_tcam.o spectrum_acl_ctcam.o \
 				   spectrum_acl_atcam.o spectrum_acl_erp.o \
 				   spectrum1_acl_tcam.o spectrum2_acl_tcam.o \
-				   spectrum_acl.o \
+				   spectrum_acl_bloom_filter.o spectrum_acl.o \
 				   spectrum_flower.o spectrum_cnt.o \
 				   spectrum_fid.o spectrum_ipip.o \
 				   spectrum_acl_flex_actions.o \

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

+// 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);
+}

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

@@ -24,6 +24,7 @@ struct mlxsw_sp_acl_erp_core {
 	unsigned int erpt_entries_size[MLXSW_SP_ACL_ATCAM_REGION_TYPE_MAX + 1];
 	struct gen_pool *erp_tables;
 	struct mlxsw_sp *mlxsw_sp;
+	struct mlxsw_sp_acl_bf *bf;
 	unsigned int num_erp_banks;
 };
 
@@ -1320,6 +1321,12 @@ static int mlxsw_sp_acl_erp_tables_init(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_gen_pool_add;
 
+	erp_core->bf = mlxsw_sp_acl_bf_init(mlxsw_sp, erp_core->num_erp_banks);
+	if (IS_ERR(erp_core->bf)) {
+		err = PTR_ERR(erp_core->bf);
+		goto err_bf_init;
+	}
+
 	/* Different regions require masks of different sizes */
 	err = mlxsw_sp_acl_erp_tables_sizes_query(mlxsw_sp, erp_core);
 	if (err)
@@ -1328,6 +1335,8 @@ static int mlxsw_sp_acl_erp_tables_init(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 
 err_erp_tables_sizes_query:
+	mlxsw_sp_acl_bf_fini(erp_core->bf);
+err_bf_init:
 err_gen_pool_add:
 	gen_pool_destroy(erp_core->erp_tables);
 	return err;
@@ -1336,6 +1345,7 @@ static int mlxsw_sp_acl_erp_tables_init(struct mlxsw_sp *mlxsw_sp,
 static void mlxsw_sp_acl_erp_tables_fini(struct mlxsw_sp *mlxsw_sp,
 					 struct mlxsw_sp_acl_erp_core *erp_core)
 {
+	mlxsw_sp_acl_bf_fini(erp_core->bf);
 	gen_pool_destroy(erp_core->erp_tables);
 }
 

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

@@ -258,4 +258,10 @@ int mlxsw_sp_acl_erps_init(struct mlxsw_sp *mlxsw_sp,
 void mlxsw_sp_acl_erps_fini(struct mlxsw_sp *mlxsw_sp,
 			    struct mlxsw_sp_acl_atcam *atcam);
 
+struct mlxsw_sp_acl_bf;
+
+struct mlxsw_sp_acl_bf *
+mlxsw_sp_acl_bf_init(struct mlxsw_sp *mlxsw_sp, unsigned int num_erp_banks);
+void mlxsw_sp_acl_bf_fini(struct mlxsw_sp_acl_bf *bf);
+
 #endif