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net: sch_ets: Make the ETS qdisc offloadable

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Add hooks at appropriate points to make it possible to offload the ETS
Qdisc.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2019-12-18 14:55:15 +00:00 committed by David S. Miller
parent dcc68b4d80
commit d35eb52bd2
3 changed files with 127 additions and 0 deletions
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1
include/linux/netdevice.h
View File

@ -849,6 +849,7 @@ enum tc_setup_type {
TC_SETUP_QDISC_GRED,
TC_SETUP_QDISC_TAPRIO,
TC_SETUP_FT,
TC_SETUP_QDISC_ETS,
};
/* These structures hold the attributes of bpf state that are being passed

31
include/net/pkt_cls.h
View File

@ -823,4 +823,35 @@ struct tc_root_qopt_offload {
bool ingress;
};
enum tc_ets_command {
TC_ETS_REPLACE,
TC_ETS_DESTROY,
TC_ETS_STATS,
TC_ETS_GRAFT,
};
struct tc_ets_qopt_offload_replace_params {
unsigned int bands;
u8 priomap[TC_PRIO_MAX + 1];
unsigned int quanta[TCQ_ETS_MAX_BANDS]; /* 0 for strict bands. */
unsigned int weights[TCQ_ETS_MAX_BANDS];
struct gnet_stats_queue *qstats;
};
struct tc_ets_qopt_offload_graft_params {
u8 band;
u32 child_handle;
};
struct tc_ets_qopt_offload {
enum tc_ets_command command;
u32 handle;
u32 parent;
union {
struct tc_ets_qopt_offload_replace_params replace_params;
struct tc_qopt_offload_stats stats;
struct tc_ets_qopt_offload_graft_params graft_params;
};
};
#endif

95
net/sched/sch_ets.c
View File

@ -102,6 +102,91 @@ static u32 ets_class_id(struct Qdisc *sch, const struct ets_class *cl)
return TC_H_MAKE(sch->handle, band + 1);
}
static void ets_offload_change(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct ets_sched *q = qdisc_priv(sch);
struct tc_ets_qopt_offload qopt;
unsigned int w_psum_prev = 0;
unsigned int q_psum = 0;
unsigned int q_sum = 0;
unsigned int quantum;
unsigned int w_psum;
unsigned int weight;
unsigned int i;
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return;
qopt.command = TC_ETS_REPLACE;
qopt.handle = sch->handle;
qopt.parent = sch->parent;
qopt.replace_params.bands = q->nbands;
qopt.replace_params.qstats = &sch->qstats;
memcpy(&qopt.replace_params.priomap,
q->prio2band, sizeof(q->prio2band));
for (i = 0; i < q->nbands; i++)
q_sum += q->classes[i].quantum;
for (i = 0; i < q->nbands; i++) {
quantum = q->classes[i].quantum;
q_psum += quantum;
w_psum = quantum ? q_psum * 100 / q_sum : 0;
weight = w_psum - w_psum_prev;
w_psum_prev = w_psum;
qopt.replace_params.quanta[i] = quantum;
qopt.replace_params.weights[i] = weight;
}
dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt);
}
static void ets_offload_destroy(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct tc_ets_qopt_offload qopt;
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return;
qopt.command = TC_ETS_DESTROY;
qopt.handle = sch->handle;
qopt.parent = sch->parent;
dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt);
}
static void ets_offload_graft(struct Qdisc *sch, struct Qdisc *new,
struct Qdisc *old, unsigned long arg,
struct netlink_ext_ack *extack)
{
struct net_device *dev = qdisc_dev(sch);
struct tc_ets_qopt_offload qopt;
qopt.command = TC_ETS_GRAFT;
qopt.handle = sch->handle;
qopt.parent = sch->parent;
qopt.graft_params.band = arg - 1;
qopt.graft_params.child_handle = new->handle;
qdisc_offload_graft_helper(dev, sch, new, old, TC_SETUP_QDISC_ETS,
&qopt, extack);
}
static int ets_offload_dump(struct Qdisc *sch)
{
struct tc_ets_qopt_offload qopt;
qopt.command = TC_ETS_STATS;
qopt.handle = sch->handle;
qopt.parent = sch->parent;
qopt.stats.bstats = &sch->bstats;
qopt.stats.qstats = &sch->qstats;
return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_ETS, &qopt);
}
static bool ets_class_is_strict(struct ets_sched *q, const struct ets_class *cl)
{
unsigned int band = cl - q->classes;
@ -154,6 +239,8 @@ static int ets_class_change(struct Qdisc *sch, u32 classid, u32 parentid,
sch_tree_lock(sch);
cl->quantum = quantum;
sch_tree_unlock(sch);
ets_offload_change(sch);
return 0;
}
@ -173,6 +260,7 @@ static int ets_class_graft(struct Qdisc *sch, unsigned long arg,
}
*old = qdisc_replace(sch, new, &cl->qdisc);
ets_offload_graft(sch, new, *old, arg, extack);
return 0;
}
@ -589,6 +677,7 @@ static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt,
sch_tree_unlock(sch);
ets_offload_change(sch);
for (i = q->nbands; i < oldbands; i++) {
qdisc_put(q->classes[i].qdisc);
memset(&q->classes[i], 0, sizeof(q->classes[i]));
@ -633,6 +722,7 @@ static void ets_qdisc_destroy(struct Qdisc *sch)
struct ets_sched *q = qdisc_priv(sch);
int band;
ets_offload_destroy(sch);
tcf_block_put(q->block);
for (band = 0; band < q->nbands; band++)
qdisc_put(q->classes[band].qdisc);
@ -645,6 +735,11 @@ static int ets_qdisc_dump(struct Qdisc *sch, struct sk_buff *skb)
struct nlattr *nest;
int band;
int prio;
int err;
err = ets_offload_dump(sch);
if (err)
return err;
opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
if (!opts)