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net: sch: prio: Add offload ability for grafting a child 

Offload sch_prio graft command for capable drivers.
Warn in case of a failure, unless the graft was done as part of a destroy
operation (the new qdisc is a noop) or if all the qdiscs (the parent, the
old child, and the new one) are not 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 10:45:06 +01:00 committed by David S. Miller
parent 98ceb7b6d6
commit b9c7a7acc7
2 changed files with 40 additions and 0 deletions
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8
include/net/pkt_cls.h
View File

@ -806,6 +806,7 @@ enum tc_prio_command {
TC_PRIO_REPLACE,
TC_PRIO_DESTROY,
TC_PRIO_STATS,
TC_PRIO_GRAFT,
};
struct tc_prio_qopt_offload_params {
@ -818,6 +819,11 @@ struct tc_prio_qopt_offload_params {
struct gnet_stats_queue *qstats;
};
struct tc_prio_qopt_offload_graft_params {
u8 band;
u32 child_handle;
};
struct tc_prio_qopt_offload {
enum tc_prio_command command;
u32 handle;
@ -825,6 +831,8 @@ struct tc_prio_qopt_offload {
union {
struct tc_prio_qopt_offload_params replace_params;
struct tc_qopt_offload_stats stats;
struct tc_prio_qopt_offload_graft_params graft_params;
};
};
#endif

32
net/sched/sch_prio.c
View File

@ -308,12 +308,44 @@ static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
struct Qdisc **old, struct netlink_ext_ack *extack)
{
struct prio_sched_data *q = qdisc_priv(sch);
struct tc_prio_qopt_offload graft_offload;
struct net_device *dev = qdisc_dev(sch);
unsigned long band = arg - 1;
bool any_qdisc_is_offloaded;
int err;
if (new == NULL)
new = &noop_qdisc;
*old = qdisc_replace(sch, new, &q->queues[band]);
if (!tc_can_offload(dev))
return 0;
graft_offload.handle = sch->handle;
graft_offload.parent = sch->parent;
graft_offload.graft_params.band = band;
graft_offload.graft_params.child_handle = new->handle;
graft_offload.command = TC_PRIO_GRAFT;
err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_PRIO,
&graft_offload);
/* Don't report error if the graft is part of destroy operation. */
if (err && new != &noop_qdisc) {
/* Don't report error if the parent, the old child and the new
* one are not offloaded.
*/
any_qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
any_qdisc_is_offloaded |= new->flags & TCQ_F_OFFLOADED;
if (*old)
any_qdisc_is_offloaded |= (*old)->flags &
TCQ_F_OFFLOADED;
if (any_qdisc_is_offloaded)
NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
}
return 0;
}