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net: sched: add an offload graft helper

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Qdisc graft operation of offload-capable qdiscs performs a few
extra steps which are identical among all the qdiscs.  Add
a helper to share this code.

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 2018-11-07 17:33:37 -08:00 • committed by David S. Miller
parent 58f8927399
commit bfaee9113f
3 changed files with 44 additions and 24 deletions
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29
net/sched/sch_api.c
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@ -831,6 +831,35 @@ int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
}
EXPORT_SYMBOL(qdisc_offload_dump_helper);
void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
struct Qdisc *new, struct Qdisc *old,
enum tc_setup_type type, void *type_data,
struct netlink_ext_ack *extack)
{
bool any_qdisc_is_offloaded;
int err;
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return;
err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
/* Don't report error if the graft is part of destroy operation. */
if (!err || !new || new == &noop_qdisc)
return;
/* Don't report error if the parent, the old child and the new
* one are not offloaded.
*/
any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
if (any_qdisc_is_offloaded)
NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
}
EXPORT_SYMBOL(qdisc_offload_graft_helper);
static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
u32 portid, u32 seq, u16 flags, int event)
{