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net: rcu-ify tcf_proto

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rcu'ify tcf_proto this allows calling tc_classify() without holding
any locks. Updaters are protected by RTNL.

This patch prepares the core net_sched infrastracture for running
the classifier/action chains without holding the qdisc lock however
it does nothing to ensure cls_xxx and act_xxx types also work without
locking. Additional patches are required to address the fall out.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
2014-09-12 20:05:27 -07:00
committed by David S. Miller
parent 46e5da40ae
commit 25d8c0d55f
17 changed files with 121 additions and 88 deletions
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8
net/sched/sch_hfsc.c
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@@ -116,7 +116,7 @@ struct hfsc_class {
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est64 rate_est;
unsigned int level; /* class level in hierarchy */
struct tcf_proto *filter_list; /* filter list */
struct tcf_proto __rcu *filter_list; /* filter list */
unsigned int filter_cnt; /* filter count */
struct hfsc_sched *sched; /* scheduler data */
@@ -1161,7 +1161,7 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
head = &q->root;
tcf = q->root.filter_list;
tcf = rcu_dereference_bh(q->root.filter_list);
while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
@@ -1185,7 +1185,7 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
return cl; /* hit leaf class */
/* apply inner filter chain */
tcf = cl->filter_list;
tcf = rcu_dereference_bh(cl->filter_list);
head = cl;
}
@@ -1285,7 +1285,7 @@ hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg)
cl->filter_cnt--;
}
static struct tcf_proto **
static struct tcf_proto __rcu **
hfsc_tcf_chain(struct Qdisc *sch, unsigned long arg)
{
struct hfsc_sched *q = qdisc_priv(sch);