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| 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_sfq.c | |
| parent | 46e5da40aec256155cfedee96dd21a75da941f2c (diff) | |
| download | blackbird-obmc-linux-25d8c0d55f241ce2d360df1bea48e23a55836ee6.tar.gz blackbird-obmc-linux-25d8c0d55f241ce2d360df1bea48e23a55836ee6.zip | |
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_sfq.c')
| -rw-r--r-- | net/sched/sch_sfq.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index 211db9017c35..80c36bd54abc 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -125,7 +125,7 @@ struct sfq_sched_data { u8 cur_depth; /* depth of longest slot */ u8 flags; unsigned short scaled_quantum; /* SFQ_ALLOT_SIZE(quantum) */ - struct tcf_proto *filter_list; + struct tcf_proto __rcu *filter_list; sfq_index *ht; /* Hash table ('divisor' slots) */ struct sfq_slot *slots; /* Flows table ('maxflows' entries) */ @@ -187,6 +187,7 @@ static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch, { struct sfq_sched_data *q = qdisc_priv(sch); struct tcf_result res; + struct tcf_proto *fl; int result; if (TC_H_MAJ(skb->priority) == sch->handle && @@ -194,13 +195,14 @@ static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch, TC_H_MIN(skb->priority) <= q->divisor) return TC_H_MIN(skb->priority); - if (!q->filter_list) { + fl = rcu_dereference_bh(q->filter_list); + if (!fl) { skb_flow_dissect(skb, &sfq_skb_cb(skb)->keys); return sfq_hash(q, skb) + 1; } *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; - result = tc_classify(skb, q->filter_list, &res); + result = tc_classify(skb, fl, &res); if (result >= 0) { #ifdef CONFIG_NET_CLS_ACT switch (result) { @@ -836,7 +838,8 @@ static void sfq_put(struct Qdisc *q, unsigned long cl) { } -static struct tcf_proto **sfq_find_tcf(struct Qdisc *sch, unsigned long cl) +static struct tcf_proto __rcu **sfq_find_tcf(struct Qdisc *sch, + unsigned long cl) { struct sfq_sched_data *q = qdisc_priv(sch); |
