From ef14c298b5b0a36d5b4943c7f774f6a1d61e035d Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 27 Jan 2022 11:02:26 +0200 Subject: mlxsw: spectrum_acl: Allocate default actions for internal TCAM regions In Spectrum-2 and later ASICs, each TCAM region has a default action that is executed in case a packet did not match any rule in the region. The location of the action in the database (KVDL) is computed by adding the region's index to a base value. Some TCAM regions are not exposed to the host and used internally by the device. Allocate KVDL entries for the default actions of these regions to avoid the host from overwriting them. With mlxsw, lookups in the internal regions are not currently performed, but it is a good practice not to overwrite their default actions. Signed-off-by: Ido Schimmel Reviewed-by: Petr Machata Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/mellanox/mlxsw/resources.h | 2 ++ drivers/net/ethernet/mellanox/mlxsw/spectrum2_acl_tcam.c | 12 +++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/resources.h b/drivers/net/ethernet/mellanox/mlxsw/resources.h index c7fc650608eb..daacf6291253 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/resources.h +++ b/drivers/net/ethernet/mellanox/mlxsw/resources.h @@ -33,6 +33,7 @@ enum mlxsw_res_id { MLXSW_RES_ID_ACL_MAX_REGIONS, MLXSW_RES_ID_ACL_MAX_GROUPS, MLXSW_RES_ID_ACL_MAX_GROUP_SIZE, + MLXSW_RES_ID_ACL_MAX_DEFAULT_ACTIONS, MLXSW_RES_ID_ACL_FLEX_KEYS, MLXSW_RES_ID_ACL_MAX_ACTION_PER_RULE, MLXSW_RES_ID_ACL_ACTIONS_PER_SET, @@ -90,6 +91,7 @@ static u16 mlxsw_res_ids[] = { [MLXSW_RES_ID_ACL_MAX_REGIONS] = 0x2903, [MLXSW_RES_ID_ACL_MAX_GROUPS] = 0x2904, [MLXSW_RES_ID_ACL_MAX_GROUP_SIZE] = 0x2905, + [MLXSW_RES_ID_ACL_MAX_DEFAULT_ACTIONS] = 0x2908, [MLXSW_RES_ID_ACL_FLEX_KEYS] = 0x2910, [MLXSW_RES_ID_ACL_MAX_ACTION_PER_RULE] = 0x2911, [MLXSW_RES_ID_ACL_ACTIONS_PER_SET] = 0x2912, diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum2_acl_tcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum2_acl_tcam.c index ad69913f19c1..5b0210862655 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum2_acl_tcam.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum2_acl_tcam.c @@ -77,7 +77,14 @@ static int mlxsw_sp2_acl_tcam_init(struct mlxsw_sp *mlxsw_sp, void *priv, int i; int err; + /* Some TCAM regions are not exposed to the host and used internally + * by the device. Allocate KVDL entries for the default actions of + * these regions to avoid the host from overwriting them. + */ tcam->kvdl_count = _tcam->max_regions; + if (MLXSW_CORE_RES_VALID(mlxsw_sp->core, ACL_MAX_DEFAULT_ACTIONS)) + tcam->kvdl_count = MLXSW_CORE_RES_GET(mlxsw_sp->core, + ACL_MAX_DEFAULT_ACTIONS); err = mlxsw_sp_kvdl_alloc(mlxsw_sp, MLXSW_SP_KVDL_ENTRY_TYPE_ACTSET, tcam->kvdl_count, &tcam->kvdl_index); if (err) @@ -97,7 +104,10 @@ static int mlxsw_sp2_acl_tcam_init(struct mlxsw_sp *mlxsw_sp, void *priv, goto err_afa_block_continue; enc_actions = mlxsw_afa_block_cur_set(afa_block); - for (i = 0; i < tcam->kvdl_count; i++) { + /* Only write to KVDL entries used by TCAM regions exposed to the + * host. + */ + for (i = 0; i < _tcam->max_regions; i++) { mlxsw_reg_pefa_pack(pefa_pl, tcam->kvdl_index + i, true, enc_actions); err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pefa), pefa_pl); -- cgit v1.2.3