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net: sched: provide notification for graft on root 

Drivers are currently not notified when a Qdisc is grafted as root.
This requires special casing Qdiscs added with parent = TC_H_ROOT in
the driver.  Also there is no notification sent to the driver when
an existing Qdisc is grafted as root.

Add this very simple notifications, drivers should now be able to
track their Qdisc tree fully.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2018-11-12 14:58:10 -08:00 committed by David S. Miller
parent 4f5681d088
commit 98b0e5f684
3 changed files with 28 additions and 0 deletions
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1
include/linux/netdevice.h
View File

@ -845,6 +845,7 @@ enum tc_setup_type {
TC_SETUP_QDISC_PRIO,
TC_SETUP_QDISC_MQ,
TC_SETUP_QDISC_ETF,
TC_SETUP_ROOT_QDISC,
};
/* These structures hold the attributes of bpf state that are being passed

10
include/net/pkt_cls.h
View File

@ -889,4 +889,14 @@ struct tc_prio_qopt_offload {
};
};
enum tc_root_command {
TC_ROOT_GRAFT,
};
struct tc_root_qopt_offload {
enum tc_root_command command;
u32 handle;
bool ingress;
};
#endif

17
net/sched/sch_api.c
View File

@ -860,6 +860,21 @@ void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
}
EXPORT_SYMBOL(qdisc_offload_graft_helper);
static void qdisc_offload_graft_root(struct net_device *dev,
struct Qdisc *new, struct Qdisc *old,
struct netlink_ext_ack *extack)
{
struct tc_root_qopt_offload graft_offload = {
.command = TC_ROOT_GRAFT,
.handle = new ? new->handle : 0,
.ingress = (new && new->flags & TCQ_F_INGRESS) ||
(old && old->flags & TCQ_F_INGRESS),
};
qdisc_offload_graft_helper(dev, NULL, new, old,
TC_SETUP_ROOT_QDISC, &graft_offload, extack);
}
static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
u32 portid, u32 seq, u16 flags, int event)
{
@ -1026,6 +1041,8 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
if (dev->flags & IFF_UP)
dev_deactivate(dev);
qdisc_offload_graft_root(dev, new, old, extack);
if (new && new->ops->attach)
goto skip;