mlxsw: Add operations structure for bloom filter calculation

Spectrum-4 will calculate hash function for bloom filter differently from
the existing ASICs.

There are two changes:
1. Instead of using one hash function to calculate 16 bits output (CRC-16),
   two functions will be used.
2. The chunks will be built differently, without padding.

As preparation for support of Spectrum-4 bloom filter, add 'ops'
structure to allow handling different calculation for different ASICs.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -3155,6 +3155,7 @@ static int mlxsw_sp2_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->mr_tcam_ops = &mlxsw_sp2_mr_tcam_ops;
 	mlxsw_sp->acl_rulei_ops = &mlxsw_sp2_acl_rulei_ops;
 	mlxsw_sp->acl_tcam_ops = &mlxsw_sp2_acl_tcam_ops;
+	mlxsw_sp->acl_bf_ops = &mlxsw_sp2_acl_bf_ops;
 	mlxsw_sp->nve_ops_arr = mlxsw_sp2_nve_ops_arr;
 	mlxsw_sp->mac_mask = mlxsw_sp2_mac_mask;
 	mlxsw_sp->sb_vals = &mlxsw_sp2_sb_vals;
@@ -3184,6 +3185,7 @@ static int mlxsw_sp3_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->mr_tcam_ops = &mlxsw_sp2_mr_tcam_ops;
 	mlxsw_sp->acl_rulei_ops = &mlxsw_sp2_acl_rulei_ops;
 	mlxsw_sp->acl_tcam_ops = &mlxsw_sp2_acl_tcam_ops;
+	mlxsw_sp->acl_bf_ops = &mlxsw_sp2_acl_bf_ops;
 	mlxsw_sp->nve_ops_arr = mlxsw_sp2_nve_ops_arr;
 	mlxsw_sp->mac_mask = mlxsw_sp2_mac_mask;
 	mlxsw_sp->sb_vals = &mlxsw_sp2_sb_vals;

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

@@ -190,6 +190,7 @@ struct mlxsw_sp {
 	const struct mlxsw_sp_mr_tcam_ops *mr_tcam_ops;
 	const struct mlxsw_sp_acl_rulei_ops *acl_rulei_ops;
 	const struct mlxsw_sp_acl_tcam_ops *acl_tcam_ops;
+	const struct mlxsw_sp_acl_bf_ops *acl_bf_ops;
 	const struct mlxsw_sp_nve_ops **nve_ops_arr;
 	const struct mlxsw_sp_sb_vals *sb_vals;
 	const struct mlxsw_sp_sb_ops *sb_ops;
@@ -1108,6 +1109,9 @@ extern const struct mlxsw_afk_ops mlxsw_sp1_afk_ops;
 extern const struct mlxsw_afk_ops mlxsw_sp2_afk_ops;
 extern const struct mlxsw_afk_ops mlxsw_sp4_afk_ops;
 
+/* spectrum_acl_bloom_filter.c */
+extern const struct mlxsw_sp_acl_bf_ops mlxsw_sp2_acl_bf_ops;
+
 /* spectrum_matchall.c */
 struct mlxsw_sp_mall_ops {
 	int (*sample_add)(struct mlxsw_sp *mlxsw_sp,

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

@@ -190,7 +190,7 @@ mlxsw_sp_acl_bf_entry_add(struct mlxsw_sp *mlxsw_sp,
 
 	mutex_lock(&bf->lock);
 
-	bf_index = mlxsw_sp2_acl_bf_index_get(bf, aregion, aentry);
+	bf_index = mlxsw_sp->acl_bf_ops->index_get(bf, aregion, aentry);
 	rule_index = mlxsw_sp_acl_bf_rule_count_index_get(bf, erp_bank,
 							  bf_index);
 
@@ -233,7 +233,7 @@ mlxsw_sp_acl_bf_entry_del(struct mlxsw_sp *mlxsw_sp,
 
 	mutex_lock(&bf->lock);
 
-	bf_index = mlxsw_sp2_acl_bf_index_get(bf, aregion, aentry);
+	bf_index = mlxsw_sp->acl_bf_ops->index_get(bf, aregion, aentry);
 	rule_index = mlxsw_sp_acl_bf_rule_count_index_get(bf, erp_bank,
 							  bf_index);
 
@@ -281,3 +281,7 @@ void mlxsw_sp_acl_bf_fini(struct mlxsw_sp_acl_bf *bf)
 	mutex_destroy(&bf->lock);
 	kfree(bf);
 }
+
+const struct mlxsw_sp_acl_bf_ops mlxsw_sp2_acl_bf_ops = {
+	.index_get = mlxsw_sp2_acl_bf_index_get,
+};

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

@@ -287,6 +287,12 @@ void mlxsw_sp_acl_erps_fini(struct mlxsw_sp *mlxsw_sp,
 
 struct mlxsw_sp_acl_bf;
 
+struct mlxsw_sp_acl_bf_ops {
+	unsigned int (*index_get)(struct mlxsw_sp_acl_bf *bf,
+				  struct mlxsw_sp_acl_atcam_region *aregion,
+				  struct mlxsw_sp_acl_atcam_entry *aentry);
+};
+
 int
 mlxsw_sp_acl_bf_entry_add(struct mlxsw_sp *mlxsw_sp,
 			  struct mlxsw_sp_acl_bf *bf,