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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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15
net/sched/sch_htb.c
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@ -103,7 +103,7 @@ struct htb_class {
u32 prio; /* these two are used only by leaves... */
int quantum; /* but stored for parent-to-leaf return */
struct tcf_proto *filter_list; /* class attached filters */
struct tcf_proto __rcu *filter_list; /* class attached filters */
int filter_cnt;
int refcnt; /* usage count of this class */
@ -153,7 +153,7 @@ struct htb_sched {
int rate2quantum; /* quant = rate / rate2quantum */
/* filters for qdisc itself */
struct tcf_proto *filter_list;
struct tcf_proto __rcu *filter_list;
#define HTB_WARN_TOOMANYEVENTS 0x1
unsigned int warned; /* only one warning */
@ -223,9 +223,9 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
if (cl->level == 0)
return cl;
/* Start with inner filter chain if a non-leaf class is selected */
tcf = cl->filter_list;
tcf = rcu_dereference_bh(cl->filter_list);
} else {
tcf = q->filter_list;
tcf = rcu_dereference_bh(q->filter_list);
}
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
@ -251,7 +251,7 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
return cl; /* we hit leaf; return it */
/* we have got inner class; apply inner filter chain */
tcf = cl->filter_list;
tcf = rcu_dereference_bh(cl->filter_list);
}
/* classification failed; try to use default class */
cl = htb_find(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch);
@ -1519,11 +1519,12 @@ failure:
return err;
}
static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg)
static struct tcf_proto __rcu **htb_find_tcf(struct Qdisc *sch,
unsigned long arg)
{
struct htb_sched *q = qdisc_priv(sch);
struct htb_class *cl = (struct htb_class *)arg;
struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list;
struct tcf_proto __rcu **fl = cl ? &cl->filter_list : &q->filter_list;
return fl;
}