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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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10
net/sched/sch_api.c
View file

@ -1781,7 +1781,7 @@ int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
__be16 protocol = skb->protocol;
int err;
for (; tp; tp = tp->next) {
for (; tp; tp = rcu_dereference_bh(tp->next)) {
if (tp->protocol != protocol &&
tp->protocol != htons(ETH_P_ALL))
continue;
@ -1833,15 +1833,15 @@ void tcf_destroy(struct tcf_proto *tp)
{
tp->ops->destroy(tp);
module_put(tp->ops->owner);
kfree(tp);
kfree_rcu(tp, rcu);
}
void tcf_destroy_chain(struct tcf_proto **fl)
void tcf_destroy_chain(struct tcf_proto __rcu **fl)
{
struct tcf_proto *tp;
while ((tp = *fl) != NULL) {
*fl = tp->next;
while ((tp = rtnl_dereference(*fl)) != NULL) {
RCU_INIT_POINTER(*fl, tp->next);
tcf_destroy(tp);
}
}