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net: sched: refactor flower walk to iterate over idr 

Extend struct tcf_walker with additional 'cookie' field. It is intended to
be used by classifier walk implementations to continue iteration directly
from particular filter, instead of iterating 'skip' number of times.

Change flower walk implementation to save filter handle in 'cookie'. Each
time flower walk is called, it looks up filter with saved handle directly
with idr, instead of iterating over filter linked list 'skip' number of
times. This change improves complexity of dumping flower classifier from
quadratic to linearithmic. (assuming idr lookup has logarithmic complexity)

Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reported-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-07-09 13:29:11 +03:00 committed by David S. Miller
parent c921c2077b
commit 01683a1469
3 changed files with 12 additions and 11 deletions
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1
include/net/pkt_cls.h
View File

@ -13,6 +13,7 @@ struct tcf_walker {
int stop;
int skip;
int count;
unsigned long cookie;
int (*fn)(struct tcf_proto *, void *node, struct tcf_walker *);
};

2
net/sched/cls_api.c
View File

@ -1508,7 +1508,9 @@ static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
arg.w.stop = 0;
arg.w.skip = cb->args[1] - 1;
arg.w.count = 0;
arg.w.cookie = cb->args[2];
tp->ops->walk(tp, &arg.w);
cb->args[2] = arg.w.cookie;
cb->args[1] = arg.w.count + 1;
if (arg.w.stop)
return false;

20
net/sched/cls_flower.c
View File

@ -1099,19 +1099,17 @@ static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
struct cls_fl_head *head = rtnl_dereference(tp->root);
struct cls_fl_filter *f;
struct fl_flow_mask *mask;
list_for_each_entry_rcu(mask, &head->masks, list) {
list_for_each_entry_rcu(f, &mask->filters, list) {
if (arg->count < arg->skip)
goto skip;
if (arg->fn(tp, f, arg) < 0) {
arg->stop = 1;
break;
}
skip:
arg->count++;
arg->count = arg->skip;
while ((f = idr_get_next_ul(&head->handle_idr,
&arg->cookie)) != NULL) {
if (arg->fn(tp, f, arg) < 0) {
arg->stop = 1;
break;
}
arg->cookie = f->handle + 1;
arg->count++;
}
}