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net_sched: make cls_ops->tcf_chain() optional

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Some qdiscs don't support attaching filters. Handle this centrally in
cls_api and return a proper errno code (EOPNOTSUPP) instead of EINVAL.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2009-09-04 06:41:15 +00:00
committed by David S. Miller
parent c9f1d0389b
commit 71ebe5e919
3 changed files with 5 additions and 12 deletions
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6
net/sched/sch_red.c
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@ -331,11 +331,6 @@ static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
}
}
static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl)
{
return NULL;
}
static const struct Qdisc_class_ops red_class_ops = {
.graft = red_graft,
.leaf = red_leaf,
@ -344,7 +339,6 @@ static const struct Qdisc_class_ops red_class_ops = {
.change = red_change_class,
.delete = red_delete,
.walk = red_walk,
.tcf_chain = red_find_tcf,
.dump = red_dump_class,
};