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mlxsw: spectrum: qdiscs: prio: Handle graft command

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Handle graft command for an offloaded sch_prio.
Grafting a qdisc to any place other than under its original parent is not
supported by mlxsw and will cause the grafted qdisc to stop being
offloaded.

Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Reviewed-by: Yuval Mintz <yuvalm@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nogah Frankel 2018-02-28 10:45:07 +01:00 committed by David S. Miller
parent b9c7a7acc7
commit 32dc5efc6c
1 changed files with 54 additions and 0 deletions
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54
drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
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@ -122,6 +122,24 @@ mlxsw_sp_qdisc_find(struct mlxsw_sp_port *mlxsw_sp_port, u32 parent,
return &mlxsw_sp_port->tclass_qdiscs[tclass];
}
static struct mlxsw_sp_qdisc *
mlxsw_sp_qdisc_find_by_handle(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle)
{
int i;
if (mlxsw_sp_port->root_qdisc->handle == handle)
return mlxsw_sp_port->root_qdisc;
if (mlxsw_sp_port->root_qdisc->handle == TC_H_UNSPEC)
return NULL;
for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
if (mlxsw_sp_port->tclass_qdiscs[i].handle == handle)
return &mlxsw_sp_port->tclass_qdiscs[i];
return NULL;
}
static int
mlxsw_sp_qdisc_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc)
@ -643,6 +661,39 @@ static struct mlxsw_sp_qdisc_ops mlxsw_sp_qdisc_ops_prio = {
.clean_stats = mlxsw_sp_setup_tc_qdisc_prio_clean_stats,
};
/* Grafting is not supported in mlxsw. It will result in un-offloading of the
* grafted qdisc as well as the qdisc in the qdisc new location.
* (However, if the graft is to the location where the qdisc is already at, it
* will be ignored completely and won't cause un-offloading).
*/
static int
mlxsw_sp_qdisc_prio_graft(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_qdisc *mlxsw_sp_qdisc,
struct tc_prio_qopt_offload_graft_params *p)
{
int tclass_num = MLXSW_SP_PRIO_BAND_TO_TCLASS(p->band);
struct mlxsw_sp_qdisc *old_qdisc;
/* Check if the grafted qdisc is already in its "new" location. If so -
* nothing needs to be done.
*/
if (p->band < IEEE_8021QAZ_MAX_TCS &&
mlxsw_sp_port->tclass_qdiscs[tclass_num].handle == p->child_handle)
return 0;
/* See if the grafted qdisc is already offloaded on any tclass. If so,
* unoffload it.
*/
old_qdisc = mlxsw_sp_qdisc_find_by_handle(mlxsw_sp_port,
p->child_handle);
if (old_qdisc)
mlxsw_sp_qdisc_destroy(mlxsw_sp_port, old_qdisc);
mlxsw_sp_qdisc_destroy(mlxsw_sp_port,
&mlxsw_sp_port->tclass_qdiscs[tclass_num]);
return -EOPNOTSUPP;
}
int mlxsw_sp_setup_tc_prio(struct mlxsw_sp_port *mlxsw_sp_port,
struct tc_prio_qopt_offload *p)
{
@ -668,6 +719,9 @@ int mlxsw_sp_setup_tc_prio(struct mlxsw_sp_port *mlxsw_sp_port,
case TC_PRIO_STATS:
return mlxsw_sp_qdisc_get_stats(mlxsw_sp_port, mlxsw_sp_qdisc,
&p->stats);
case TC_PRIO_GRAFT:
return mlxsw_sp_qdisc_prio_graft(mlxsw_sp_port, mlxsw_sp_qdisc,
&p->graft_params);
default:
return -EOPNOTSUPP;
}