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mlxsw: spectrum_qdisc: Offload root TBF as port shaper

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The Spectrum ASIC allows configuration of maximum shaper on all levels of
the scheduling hierarchy: TCs, subgroups, groups and also ports. Currently,
TBF always configures a subgroup. But a user could reasonably express the
intent to configure port shaper by putting TBF to a root position, around
ETS / PRIO. Accept this usage and offload appropriately.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2021-10-27 18:19:59 +03:00 committed by Jakub Kicinski
parent 7df621a3ee
commit 48e4d00b1b
1 changed files with 37 additions and 18 deletions
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55
drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
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@ -271,6 +271,7 @@ mlxsw_sp_qdisc_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc_tree_validate {
bool forbid_ets;
bool forbid_root_tbf;
bool forbid_tbf;
bool forbid_red;
};
@ -310,18 +311,26 @@ __mlxsw_sp_qdisc_tree_validate(struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
if (validate.forbid_red)
return -EINVAL;
validate.forbid_red = true;
validate.forbid_root_tbf = true;
validate.forbid_ets = true;
break;
case MLXSW_SP_QDISC_TBF:
if (validate.forbid_tbf)
return -EINVAL;
validate.forbid_tbf = true;
validate.forbid_ets = true;
if (validate.forbid_root_tbf) {
if (validate.forbid_tbf)
return -EINVAL;
/* This is a TC TBF. */
validate.forbid_tbf = true;
validate.forbid_ets = true;
} else {
/* This is root TBF. */
validate.forbid_root_tbf = true;
}
break;
case MLXSW_SP_QDISC_PRIO:
case MLXSW_SP_QDISC_ETS:
if (validate.forbid_ets)
return -EINVAL;
validate.forbid_root_tbf = true;
validate.forbid_ets = true;
break;
default:
@ -905,16 +914,34 @@ mlxsw_sp_setup_tc_qdisc_leaf_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
mlxsw_sp_qdisc->stats_base.backlog = 0;
}
static enum mlxsw_reg_qeec_hr
mlxsw_sp_qdisc_tbf_hr(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
{
if (mlxsw_sp_qdisc == &mlxsw_sp_port->qdisc->root_qdisc)
return MLXSW_REG_QEEC_HR_PORT;
/* Configure subgroup shaper, so that both UC and MC traffic is subject
* to shaping. That is unlike RED, however UC queue lengths are going to
* be different than MC ones due to different pool and quota
* configurations, so the configuration is not applicable. For shaper on
* the other hand, subjecting the overall stream to the configured
* shaper makes sense. Also note that that is what we do for
* ieee_setmaxrate().
*/
return MLXSW_REG_QEEC_HR_SUBGROUP;
}
static int
mlxsw_sp_qdisc_tbf_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
{
enum mlxsw_reg_qeec_hr hr = mlxsw_sp_qdisc_tbf_hr(mlxsw_sp_port,
mlxsw_sp_qdisc);
int tclass_num = mlxsw_sp_qdisc_get_tclass_num(mlxsw_sp_port,
mlxsw_sp_qdisc);
return mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port,
MLXSW_REG_QEEC_HR_SUBGROUP,
tclass_num, 0,
return mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port, hr, tclass_num, 0,
MLXSW_REG_QEEC_MAS_DIS, 0);
}
@ -996,6 +1023,8 @@ mlxsw_sp_qdisc_tbf_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
void *params)
{
enum mlxsw_reg_qeec_hr hr = mlxsw_sp_qdisc_tbf_hr(mlxsw_sp_port,
mlxsw_sp_qdisc);
struct tc_tbf_qopt_offload_replace_params *p = params;
u64 rate_kbps = mlxsw_sp_qdisc_tbf_rate_kbps(p);
int tclass_num;
@ -1016,17 +1045,7 @@ mlxsw_sp_qdisc_tbf_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
/* check_params above was supposed to reject this value. */
return -EINVAL;
/* Configure subgroup shaper, so that both UC and MC traffic is subject
* to shaping. That is unlike RED, however UC queue lengths are going to
* be different than MC ones due to different pool and quota
* configurations, so the configuration is not applicable. For shaper on
* the other hand, subjecting the overall stream to the configured
* shaper makes sense. Also note that that is what we do for
* ieee_setmaxrate().
*/
return mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port,
MLXSW_REG_QEEC_HR_SUBGROUP,
tclass_num, 0,
return mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port, hr, tclass_num, 0,
rate_kbps, burst_size);
}