diff options
| author | John Fastabend <john.fastabend@gmail.com> | 2014-09-12 20:05:27 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-13 12:30:25 -0400 |
| commit | 25d8c0d55f241ce2d360df1bea48e23a55836ee6 (patch) | |
| tree | c0aca67607e7ce560a4a2cebef5fb6d55adf4112 /net/sched/sch_drr.c | |
| parent | 46e5da40aec256155cfedee96dd21a75da941f2c (diff) | |
| download | linux-25d8c0d55f241ce2d360df1bea48e23a55836ee6.tar.bz2 | |
net: rcu-ify tcf_proto
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>
Diffstat (limited to 'net/sched/sch_drr.c')
| -rw-r--r-- | net/sched/sch_drr.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c index 7bbbfe112192..d8b5ccfd248a 100644 --- a/net/sched/sch_drr.c +++ b/net/sched/sch_drr.c @@ -35,7 +35,7 @@ struct drr_class { struct drr_sched { struct list_head active; - struct tcf_proto *filter_list; + struct tcf_proto __rcu *filter_list; struct Qdisc_class_hash clhash; }; @@ -184,7 +184,8 @@ static void drr_put_class(struct Qdisc *sch, unsigned long arg) drr_destroy_class(sch, cl); } -static struct tcf_proto **drr_tcf_chain(struct Qdisc *sch, unsigned long cl) +static struct tcf_proto __rcu **drr_tcf_chain(struct Qdisc *sch, + unsigned long cl) { struct drr_sched *q = qdisc_priv(sch); @@ -319,6 +320,7 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch, struct drr_sched *q = qdisc_priv(sch); struct drr_class *cl; struct tcf_result res; + struct tcf_proto *fl; int result; if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) { @@ -328,7 +330,8 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch, } *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; - result = tc_classify(skb, q->filter_list, &res); + fl = rcu_dereference_bh(q->filter_list); + result = tc_classify(skb, fl, &res); if (result >= 0) { #ifdef CONFIG_NET_CLS_ACT switch (result) { |