mlxsw: spectrum_acl: Update Bloom filter on eRP transitions

Bloom filter update is required only for rules which reside on an
eRP. When the region has only a single rule pattern then eRP table
is not used, however insertion of another pattern would trigger a
move to an active eRP table so it is imperative to update the Bloom
filter with all previously configured rules.

Add a method that updates Bloom filter entries for all rules
currently configured in the region, on the event of a transition
from master mask to eRP, or vice versa. For that purpose, maintain
a list of all A-TCAM rules within mlxsw_sp_acl_atcam_region.
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/spectrum_acl_atcam.c

@@ -323,6 +323,7 @@ mlxsw_sp_acl_atcam_region_init(struct mlxsw_sp *mlxsw_sp,
 	aregion->region = region;
 	aregion->atcam = atcam;
 	mlxsw_sp_acl_atcam_region_type_init(aregion);
+	INIT_LIST_HEAD(&aregion->entries_list);
 
 	err = rhashtable_init(&aregion->entries_ht,
 			      &mlxsw_sp_acl_atcam_entries_ht_params);
@@ -356,6 +357,7 @@ void mlxsw_sp_acl_atcam_region_fini(struct mlxsw_sp_acl_atcam_region *aregion)
 	mlxsw_sp_acl_erp_region_fini(aregion);
 	aregion->ops->fini(aregion);
 	rhashtable_destroy(&aregion->entries_ht);
+	WARN_ON(!list_empty(&aregion->entries_list));
 }
 
 void mlxsw_sp_acl_atcam_chunk_init(struct mlxsw_sp_acl_atcam_region *aregion,
@@ -499,6 +501,12 @@ __mlxsw_sp_acl_atcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 		mlxsw_sp_acl_erp_delta_value(delta, aentry->full_enc_key);
 	mlxsw_sp_acl_erp_delta_clear(delta, aentry->ht_key.enc_key);
 
+	/* Add rule to the list of A-TCAM rules, assuming this
+	 * rule is intended to A-TCAM. In case this rule does
+	 * not fit into A-TCAM it will be removed from the list.
+	 */
+	list_add(&aentry->list, &aregion->entries_list);
+
 	/* We can't insert identical rules into the A-TCAM, so fail and
 	 * let the rule spill into C-TCAM
 	 */
@@ -528,6 +536,7 @@ __mlxsw_sp_acl_atcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 	rhashtable_remove_fast(&aregion->entries_ht, &aentry->ht_node,
 			       mlxsw_sp_acl_atcam_entries_ht_params);
 err_rhashtable_insert:
+	list_del(&aentry->list);
 	mlxsw_sp_acl_erp_mask_put(aregion, erp_mask);
 	return err;
 }
@@ -541,6 +550,7 @@ __mlxsw_sp_acl_atcam_entry_del(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp_acl_erp_bf_remove(mlxsw_sp, aregion, aentry->erp_mask, aentry);
 	rhashtable_remove_fast(&aregion->entries_ht, &aentry->ht_node,
 			       mlxsw_sp_acl_atcam_entries_ht_params);
+	list_del(&aentry->list);
 	mlxsw_sp_acl_erp_mask_put(aregion, aentry->erp_mask);
 }
 

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

@@ -517,6 +517,48 @@ mlxsw_sp_acl_erp_table_expand(struct mlxsw_sp_acl_erp_table *erp_table)
 	return err;
 }
 
+static int
+mlxsw_acl_erp_table_bf_add(struct mlxsw_sp_acl_erp_table *erp_table,
+			   struct mlxsw_sp_acl_erp *erp)
+{
+	struct mlxsw_sp_acl_atcam_region *aregion = erp_table->aregion;
+	unsigned int erp_bank = mlxsw_sp_acl_erp_bank_get(erp);
+	struct mlxsw_sp_acl_atcam_entry *aentry;
+	int err;
+
+	list_for_each_entry(aentry, &aregion->entries_list, list) {
+		err = mlxsw_sp_acl_bf_entry_add(aregion->region->mlxsw_sp,
+						erp_table->erp_core->bf,
+						aregion, erp_bank, aentry);
+		if (err)
+			goto bf_entry_add_err;
+	}
+
+	return 0;
+
+bf_entry_add_err:
+	list_for_each_entry_continue_reverse(aentry, &aregion->entries_list,
+					     list)
+		mlxsw_sp_acl_bf_entry_del(aregion->region->mlxsw_sp,
+					  erp_table->erp_core->bf,
+					  aregion, erp_bank, aentry);
+	return err;
+}
+
+static void
+mlxsw_acl_erp_table_bf_del(struct mlxsw_sp_acl_erp_table *erp_table,
+			   struct mlxsw_sp_acl_erp *erp)
+{
+	struct mlxsw_sp_acl_atcam_region *aregion = erp_table->aregion;
+	unsigned int erp_bank = mlxsw_sp_acl_erp_bank_get(erp);
+	struct mlxsw_sp_acl_atcam_entry *aentry;
+
+	list_for_each_entry_reverse(aentry, &aregion->entries_list, list)
+		mlxsw_sp_acl_bf_entry_del(aregion->region->mlxsw_sp,
+					  erp_table->erp_core->bf,
+					  aregion, erp_bank, aentry);
+}
+
 static int
 mlxsw_sp_acl_erp_region_table_trans(struct mlxsw_sp_acl_erp_table *erp_table)
 {
@@ -551,6 +593,14 @@ mlxsw_sp_acl_erp_region_table_trans(struct mlxsw_sp_acl_erp_table *erp_table)
 	if (err)
 		goto err_table_master_rp_add;
 
+	/* Update Bloom filter before enabling eRP table, as rules
+	 * on the master RP were not set to Bloom filter up to this
+	 * point.
+	 */
+	err = mlxsw_acl_erp_table_bf_add(erp_table, master_rp);
+	if (err)
+		goto err_table_bf_add;
+
 	err = mlxsw_sp_acl_erp_table_enable(erp_table, false);
 	if (err)
 		goto err_table_enable;
@@ -558,6 +608,8 @@ mlxsw_sp_acl_erp_region_table_trans(struct mlxsw_sp_acl_erp_table *erp_table)
 	return 0;
 
 err_table_enable:
+	mlxsw_acl_erp_table_bf_del(erp_table, master_rp);
+err_table_bf_add:
 	mlxsw_sp_acl_erp_table_erp_del(master_rp);
 err_table_master_rp_add:
 	__clear_bit(master_rp->index, erp_table->erp_index_bitmap);
@@ -578,6 +630,7 @@ mlxsw_sp_acl_erp_region_master_mask_trans(struct mlxsw_sp_acl_erp_table *erp_tab
 	master_rp = mlxsw_sp_acl_erp_table_master_rp(erp_table);
 	if (!master_rp)
 		return;
+	mlxsw_acl_erp_table_bf_del(erp_table, master_rp);
 	mlxsw_sp_acl_erp_table_erp_del(master_rp);
 	__clear_bit(master_rp->index, erp_table->erp_index_bitmap);
 	mlxsw_sp_acl_erp_table_free(erp_core, erp_table->num_max_atcam_erps,

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

@@ -152,6 +152,7 @@ struct mlxsw_sp_acl_atcam {
 
 struct mlxsw_sp_acl_atcam_region {
 	struct rhashtable entries_ht; /* A-TCAM only */
+	struct list_head entries_list; /* A-TCAM only */
 	struct mlxsw_sp_acl_ctcam_region cregion;
 	const struct mlxsw_sp_acl_atcam_region_ops *ops;
 	struct mlxsw_sp_acl_tcam_region *region;
@@ -174,6 +175,7 @@ struct mlxsw_sp_acl_atcam_chunk {
 
 struct mlxsw_sp_acl_atcam_entry {
 	struct rhash_head ht_node;
+	struct list_head list; /* Member in entries_list */
 	struct mlxsw_sp_acl_atcam_entry_ht_key ht_key;
 	char full_enc_key[MLXSW_REG_PTCEX_FLEX_KEY_BLOCKS_LEN]; /* Encoded key */
 	struct {