From cb56e214679ffd1e30e980c56349831c5a00cfdf Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Wed, 30 Jan 2019 08:58:33 +0000 Subject: [PATCH] mlxsw: spectrum_acl: Include delta bits into hashtable key Currently only ERP mask masked bits in key are considered for the hashtable key. That leads to false negative collisions and fallbacks to C-TCAM in case two keys differ only in delta bits. Fix this by taking full encoded key as a hashtable key, including delta bits. Reported-by: Nir Dotan Signed-off-by: Jiri Pirko Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- .../mellanox/mlxsw/spectrum_acl_atcam.c | 21 +++++++++---------- .../mlxsw/spectrum_acl_bloom_filter.c | 2 +- .../mellanox/mlxsw/spectrum_acl_tcam.h | 10 +++++---- 3 files changed, 17 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_atcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_atcam.c index 40dc76a5c412..cda0a7170c34 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_atcam.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_atcam.c @@ -390,8 +390,7 @@ mlxsw_sp_acl_atcam_region_entry_insert(struct mlxsw_sp *mlxsw_sp, if (err) return err; - lkey_id = aregion->ops->lkey_id_get(aregion, aentry->ht_key.enc_key, - erp_id); + lkey_id = aregion->ops->lkey_id_get(aregion, aentry->enc_key, erp_id); if (IS_ERR(lkey_id)) return PTR_ERR(lkey_id); aentry->lkey_id = lkey_id; @@ -399,7 +398,7 @@ mlxsw_sp_acl_atcam_region_entry_insert(struct mlxsw_sp *mlxsw_sp, kvdl_index = mlxsw_afa_block_first_kvdl_index(rulei->act_block); mlxsw_reg_ptce3_pack(ptce3_pl, true, MLXSW_REG_PTCE3_OP_WRITE_WRITE, priority, region->tcam_region_info, - aentry->ht_key.enc_key, erp_id, + aentry->enc_key, erp_id, aentry->delta_info.start, aentry->delta_info.mask, aentry->delta_info.value, @@ -424,12 +423,11 @@ mlxsw_sp_acl_atcam_region_entry_remove(struct mlxsw_sp *mlxsw_sp, struct mlxsw_sp_acl_atcam_lkey_id *lkey_id = aentry->lkey_id; struct mlxsw_sp_acl_tcam_region *region = aregion->region; u8 erp_id = mlxsw_sp_acl_erp_mask_erp_id(aentry->erp_mask); - char *enc_key = aentry->ht_key.enc_key; char ptce3_pl[MLXSW_REG_PTCE3_LEN]; mlxsw_reg_ptce3_pack(ptce3_pl, false, MLXSW_REG_PTCE3_OP_WRITE_WRITE, 0, region->tcam_region_info, - enc_key, erp_id, + aentry->enc_key, erp_id, aentry->delta_info.start, aentry->delta_info.mask, aentry->delta_info.value, @@ -458,7 +456,7 @@ mlxsw_sp_acl_atcam_region_entry_action_replace(struct mlxsw_sp *mlxsw_sp, kvdl_index = mlxsw_afa_block_first_kvdl_index(rulei->act_block); mlxsw_reg_ptce3_pack(ptce3_pl, true, MLXSW_REG_PTCE3_OP_WRITE_UPDATE, priority, region->tcam_region_info, - aentry->ht_key.enc_key, erp_id, + aentry->enc_key, erp_id, aentry->delta_info.start, aentry->delta_info.mask, aentry->delta_info.value, @@ -481,15 +479,15 @@ __mlxsw_sp_acl_atcam_entry_add(struct mlxsw_sp *mlxsw_sp, int err; mlxsw_afk_encode(afk, region->key_info, &rulei->values, - aentry->full_enc_key, mask); + aentry->ht_key.full_enc_key, mask); erp_mask = mlxsw_sp_acl_erp_mask_get(aregion, mask, false); if (IS_ERR(erp_mask)) return PTR_ERR(erp_mask); aentry->erp_mask = erp_mask; aentry->ht_key.erp_id = mlxsw_sp_acl_erp_mask_erp_id(erp_mask); - memcpy(aentry->ht_key.enc_key, aentry->full_enc_key, - sizeof(aentry->ht_key.enc_key)); + memcpy(aentry->enc_key, aentry->ht_key.full_enc_key, + sizeof(aentry->enc_key)); /* Compute all needed delta information and clear the delta bits * from the encrypted key. @@ -498,8 +496,9 @@ __mlxsw_sp_acl_atcam_entry_add(struct mlxsw_sp *mlxsw_sp, aentry->delta_info.start = mlxsw_sp_acl_erp_delta_start(delta); aentry->delta_info.mask = mlxsw_sp_acl_erp_delta_mask(delta); aentry->delta_info.value = - mlxsw_sp_acl_erp_delta_value(delta, aentry->full_enc_key); - mlxsw_sp_acl_erp_delta_clear(delta, aentry->ht_key.enc_key); + mlxsw_sp_acl_erp_delta_value(delta, + aentry->ht_key.full_enc_key); + mlxsw_sp_acl_erp_delta_clear(delta, aentry->enc_key); /* Add rule to the list of A-TCAM rules, assuming this * rule is intended to A-TCAM. In case this rule does diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c index f5c381dcb015..9545b572747e 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_bloom_filter.c @@ -133,7 +133,7 @@ mlxsw_sp_acl_bf_key_encode(struct mlxsw_sp_acl_atcam_region *aregion, memcpy(chunk + MLXSW_BLOOM_CHUNK_PAD_BYTES, &erp_region_id, sizeof(erp_region_id)); memcpy(chunk + MLXSW_BLOOM_CHUNK_KEY_OFFSET, - &aentry->ht_key.enc_key[chunk_key_offsets[chunk_index]], + &aentry->enc_key[chunk_key_offsets[chunk_index]], MLXSW_BLOOM_CHUNK_KEY_BYTES); chunk += MLXSW_BLOOM_KEY_CHUNK_BYTES; } diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h index 10512b7c6d50..0858d5b06353 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h @@ -161,9 +161,9 @@ struct mlxsw_sp_acl_atcam_region { }; struct mlxsw_sp_acl_atcam_entry_ht_key { - char enc_key[MLXSW_REG_PTCEX_FLEX_KEY_BLOCKS_LEN]; /* Encoded key, - * minus delta bits. - */ + char full_enc_key[MLXSW_REG_PTCEX_FLEX_KEY_BLOCKS_LEN]; /* Encoded + * key. + */ u8 erp_id; }; @@ -175,7 +175,9 @@ 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 */ + char enc_key[MLXSW_REG_PTCEX_FLEX_KEY_BLOCKS_LEN]; /* Encoded key, + * minus delta bits. + */ struct { u16 start; u8 mask; -- 2.30.2