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Message-ID: <20140912162916.19588.13687.stgit@nitbit.x32>
Date: Fri, 12 Sep 2014 09:29:18 -0700
From: John Fastabend <john.fastabend@...il.com>
To: xiyou.wangcong@...il.com, davem@...emloft.net,
eric.dumazet@...il.com, jhs@...atatu.com
Cc: netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
brouer@...hat.com
Subject: [net-next PATCH v5 02/16] 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@...el.com>
---
include/net/sch_generic.h | 9 +++++----
net/sched/cls_api.c | 30 +++++++++++++++---------------
net/sched/sch_api.c | 10 +++++-----
net/sched/sch_atm.c | 20 +++++++++++---------
net/sched/sch_cbq.c | 11 +++++++----
net/sched/sch_choke.c | 15 +++++++++------
net/sched/sch_drr.c | 9 ++++++---
net/sched/sch_dsmark.c | 9 +++++----
net/sched/sch_fq_codel.c | 11 +++++++----
net/sched/sch_hfsc.c | 8 ++++----
net/sched/sch_htb.c | 15 ++++++++-------
net/sched/sch_ingress.c | 8 +++++---
net/sched/sch_multiq.c | 8 +++++---
net/sched/sch_prio.c | 11 +++++++----
net/sched/sch_qfq.c | 9 ++++++---
net/sched/sch_sfb.c | 15 +++++++++------
net/sched/sch_sfq.c | 11 +++++++----
17 files changed, 121 insertions(+), 88 deletions(-)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 56838ab..1e89b9a 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -143,7 +143,7 @@ struct Qdisc_class_ops {
void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
/* Filter manipulation */
- struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
+ struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
u32 classid);
void (*unbind_tcf)(struct Qdisc *, unsigned long);
@@ -212,8 +212,8 @@ struct tcf_proto_ops {
struct tcf_proto {
/* Fast access part */
- struct tcf_proto *next;
- void *root;
+ struct tcf_proto __rcu *next;
+ void __rcu *root;
int (*classify)(struct sk_buff *,
const struct tcf_proto *,
struct tcf_result *);
@@ -225,6 +225,7 @@ struct tcf_proto {
struct Qdisc *q;
void *data;
const struct tcf_proto_ops *ops;
+ struct rcu_head rcu;
};
struct qdisc_skb_cb {
@@ -378,7 +379,7 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
void __qdisc_calculate_pkt_len(struct sk_buff *skb,
const struct qdisc_size_table *stab);
void tcf_destroy(struct tcf_proto *tp);
-void tcf_destroy_chain(struct tcf_proto **fl);
+void tcf_destroy_chain(struct tcf_proto __rcu **fl);
/* Reset all TX qdiscs greater then index of a device. */
static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index c28b0d3..e547efd 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -117,7 +117,6 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tca[TCA_MAX + 1];
- spinlock_t *root_lock;
struct tcmsg *t;
u32 protocol;
u32 prio;
@@ -125,7 +124,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
u32 parent;
struct net_device *dev;
struct Qdisc *q;
- struct tcf_proto **back, **chain;
+ struct tcf_proto __rcu **back;
+ struct tcf_proto __rcu **chain;
struct tcf_proto *tp;
const struct tcf_proto_ops *tp_ops;
const struct Qdisc_class_ops *cops;
@@ -197,7 +197,9 @@ replay:
goto errout;
/* Check the chain for existence of proto-tcf with this priority */
- for (back = chain; (tp = *back) != NULL; back = &tp->next) {
+ for (back = chain;
+ (tp = rtnl_dereference(*back)) != NULL;
+ back = &tp->next) {
if (tp->prio >= prio) {
if (tp->prio == prio) {
if (!nprio ||
@@ -209,8 +211,6 @@ replay:
}
}
- root_lock = qdisc_root_sleeping_lock(q);
-
if (tp == NULL) {
/* Proto-tcf does not exist, create new one */
@@ -259,7 +259,8 @@ replay:
}
tp->ops = tp_ops;
tp->protocol = protocol;
- tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
+ tp->prio = nprio ? :
+ TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
tp->q = q;
tp->classify = tp_ops->classify;
tp->classid = parent;
@@ -280,9 +281,9 @@ replay:
if (fh == 0) {
if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
- spin_lock_bh(root_lock);
- *back = tp->next;
- spin_unlock_bh(root_lock);
+ struct tcf_proto *next = rtnl_dereference(tp->next);
+
+ RCU_INIT_POINTER(*back, next);
tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
tcf_destroy(tp);
@@ -322,10 +323,8 @@ replay:
n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
if (err == 0) {
if (tp_created) {
- spin_lock_bh(root_lock);
- tp->next = *back;
- *back = tp;
- spin_unlock_bh(root_lock);
+ RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
+ rcu_assign_pointer(*back, tp);
}
tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
} else {
@@ -420,7 +419,7 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
int s_t;
struct net_device *dev;
struct Qdisc *q;
- struct tcf_proto *tp, **chain;
+ struct tcf_proto *tp, __rcu **chain;
struct tcmsg *tcm = nlmsg_data(cb->nlh);
unsigned long cl = 0;
const struct Qdisc_class_ops *cops;
@@ -454,7 +453,8 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
s_t = cb->args[0];
- for (tp = *chain, t = 0; tp; tp = tp->next, t++) {
+ for (tp = rtnl_dereference(*chain), t = 0;
+ tp; tp = rtnl_dereference(tp->next), t++) {
if (t < s_t)
continue;
if (TC_H_MAJ(tcm->tcm_info) &&
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 58bed75..ca62483 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -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);
}
}
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 8449b33..c398f9c 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -41,7 +41,7 @@
struct atm_flow_data {
struct Qdisc *q; /* FIFO, TBF, etc. */
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
void (*old_pop)(struct atm_vcc *vcc,
struct sk_buff *skb); /* chaining */
@@ -273,7 +273,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
error = -ENOBUFS;
goto err_out;
}
- flow->filter_list = NULL;
+ RCU_INIT_POINTER(flow->filter_list, NULL);
flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
if (!flow->q)
flow->q = &noop_qdisc;
@@ -311,7 +311,7 @@ static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
if (list_empty(&flow->list))
return -EINVAL;
- if (flow->filter_list || flow == &p->link)
+ if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
return -EBUSY;
/*
* Reference count must be 2: one for "keepalive" (set at class
@@ -345,7 +345,8 @@ static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
}
}
-static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
struct atm_flow_data *flow = (struct atm_flow_data *)cl;
@@ -369,11 +370,12 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
flow = NULL;
if (TC_H_MAJ(skb->priority) != sch->handle ||
!(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
+ struct tcf_proto *fl;
+
list_for_each_entry(flow, &p->flows, list) {
- if (flow->filter_list) {
- result = tc_classify_compat(skb,
- flow->filter_list,
- &res);
+ fl = rcu_dereference_bh(flow->filter_list);
+ if (fl) {
+ result = tc_classify_compat(skb, fl, &res);
if (result < 0)
continue;
flow = (struct atm_flow_data *)res.class;
@@ -544,7 +546,7 @@ static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
if (!p->link.q)
p->link.q = &noop_qdisc;
pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
- p->link.filter_list = NULL;
+ RCU_INIT_POINTER(p->link.filter_list, NULL);
p->link.vcc = NULL;
p->link.sock = NULL;
p->link.classid = sch->handle;
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 762a04b..a3244a8 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -133,7 +133,7 @@ struct cbq_class {
struct gnet_stats_rate_est64 rate_est;
struct tc_cbq_xstats xstats;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
int refcnt;
int filters;
@@ -221,6 +221,7 @@ cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
struct cbq_class **defmap;
struct cbq_class *cl = NULL;
u32 prio = skb->priority;
+ struct tcf_proto *fl;
struct tcf_result res;
/*
@@ -235,11 +236,12 @@ cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
int result = 0;
defmap = head->defaults;
+ fl = rcu_dereference_bh(head->filter_list);
/*
* Step 2+n. Apply classifier.
*/
- if (!head->filter_list ||
- (result = tc_classify_compat(skb, head->filter_list, &res)) < 0)
+ result = tc_classify_compat(skb, fl, &res);
+ if (!fl || result < 0)
goto fallback;
cl = (void *)res.class;
@@ -1954,7 +1956,8 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg)
return 0;
}
-static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg)
+static struct tcf_proto __rcu **cbq_find_tcf(struct Qdisc *sch,
+ unsigned long arg)
{
struct cbq_sched_data *q = qdisc_priv(sch);
struct cbq_class *cl = (struct cbq_class *)arg;
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index ed30e43..74813e6 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -57,7 +57,7 @@ struct choke_sched_data {
/* Variables */
struct red_vars vars;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
struct {
u32 prob_drop; /* Early probability drops */
u32 prob_mark; /* Early probability marks */
@@ -193,9 +193,11 @@ static bool choke_classify(struct sk_buff *skb,
{
struct choke_sched_data *q = qdisc_priv(sch);
struct tcf_result res;
+ struct tcf_proto *fl;
int result;
- 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) {
@@ -249,7 +251,7 @@ static bool choke_match_random(const struct choke_sched_data *q,
return false;
oskb = choke_peek_random(q, pidx);
- if (q->filter_list)
+ if (rcu_access_pointer(q->filter_list))
return choke_get_classid(nskb) == choke_get_classid(oskb);
return choke_match_flow(oskb, nskb);
@@ -257,11 +259,11 @@ static bool choke_match_random(const struct choke_sched_data *q,
static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
+ int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
struct choke_sched_data *q = qdisc_priv(sch);
const struct red_parms *p = &q->parms;
- int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
- if (q->filter_list) {
+ if (rcu_access_pointer(q->filter_list)) {
/* If using external classifiers, get result and record it. */
if (!choke_classify(skb, sch, &ret))
goto other_drop; /* Packet was eaten by filter */
@@ -554,7 +556,8 @@ static unsigned long choke_bind(struct Qdisc *sch, unsigned long parent,
return 0;
}
-static struct tcf_proto **choke_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **choke_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct choke_sched_data *q = qdisc_priv(sch);
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 7bbbfe1..d8b5ccf 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) {
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 49d6ef3..485e456 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -37,7 +37,7 @@
struct dsmark_qdisc_data {
struct Qdisc *q;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
u8 *mask; /* "owns" the array */
u8 *value;
u16 indices;
@@ -186,8 +186,8 @@ ignore:
}
}
-static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
- unsigned long cl)
+static inline struct tcf_proto __rcu **dsmark_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct dsmark_qdisc_data *p = qdisc_priv(sch);
return &p->filter_list;
@@ -229,7 +229,8 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
skb->tc_index = TC_H_MIN(skb->priority);
else {
struct tcf_result res;
- int result = tc_classify(skb, p->filter_list, &res);
+ struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
+ int result = tc_classify(skb, fl, &res);
pr_debug("result %d class 0x%04x\n", result, res.classid);
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index cc56c8b..105cf55 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -52,7 +52,7 @@ struct fq_codel_flow {
}; /* please try to keep this structure <= 64 bytes */
struct fq_codel_sched_data {
- struct tcf_proto *filter_list; /* optional external classifier */
+ struct tcf_proto __rcu *filter_list; /* optional external classifier */
struct fq_codel_flow *flows; /* Flows table [flows_cnt] */
u32 *backlogs; /* backlog table [flows_cnt] */
u32 flows_cnt; /* number of flows */
@@ -85,6 +85,7 @@ static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
int *qerr)
{
struct fq_codel_sched_data *q = qdisc_priv(sch);
+ struct tcf_proto *filter;
struct tcf_result res;
int result;
@@ -93,11 +94,12 @@ static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
TC_H_MIN(skb->priority) <= q->flows_cnt)
return TC_H_MIN(skb->priority);
- if (!q->filter_list)
+ filter = rcu_dereference(q->filter_list);
+ if (!filter)
return fq_codel_hash(q, skb) + 1;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
- result = tc_classify(skb, q->filter_list, &res);
+ result = tc_classify(skb, filter, &res);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
@@ -496,7 +498,8 @@ static void fq_codel_put(struct Qdisc *q, unsigned long cl)
{
}
-static struct tcf_proto **fq_codel_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **fq_codel_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct fq_codel_sched_data *q = qdisc_priv(sch);
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index ec8aeaa..04b0de4 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -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);
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index aea942c..6d16b9b 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -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;
}
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 62871c1..b351125 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -17,7 +17,7 @@
struct ingress_qdisc_data {
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
};
/* ------------------------- Class/flow operations ------------------------- */
@@ -46,7 +46,8 @@ static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
}
-static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct ingress_qdisc_data *p = qdisc_priv(sch);
@@ -59,9 +60,10 @@ static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
struct ingress_qdisc_data *p = qdisc_priv(sch);
struct tcf_result res;
+ struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
int result;
- result = tc_classify(skb, p->filter_list, &res);
+ result = tc_classify(skb, fl, &res);
qdisc_bstats_update(sch, skb);
switch (result) {
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index afb050a..c0466c1 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -31,7 +31,7 @@ struct multiq_sched_data {
u16 bands;
u16 max_bands;
u16 curband;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
struct Qdisc **queues;
};
@@ -42,10 +42,11 @@ multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
struct multiq_sched_data *q = qdisc_priv(sch);
u32 band;
struct tcf_result res;
+ struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
int err;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
- err = tc_classify(skb, q->filter_list, &res);
+ err = tc_classify(skb, fl, &res);
#ifdef CONFIG_NET_CLS_ACT
switch (err) {
case TC_ACT_STOLEN:
@@ -388,7 +389,8 @@ static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
}
}
-static struct tcf_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **multiq_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct multiq_sched_data *q = qdisc_priv(sch);
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 79359b6..03ef99e 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -24,7 +24,7 @@
struct prio_sched_data {
int bands;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
u8 prio2band[TC_PRIO_MAX+1];
struct Qdisc *queues[TCQ_PRIO_BANDS];
};
@@ -36,11 +36,13 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
struct prio_sched_data *q = qdisc_priv(sch);
u32 band = skb->priority;
struct tcf_result res;
+ struct tcf_proto *fl;
int err;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
if (TC_H_MAJ(skb->priority) != sch->handle) {
- err = tc_classify(skb, q->filter_list, &res);
+ fl = rcu_dereference_bh(q->filter_list);
+ err = tc_classify(skb, fl, &res);
#ifdef CONFIG_NET_CLS_ACT
switch (err) {
case TC_ACT_STOLEN:
@@ -50,7 +52,7 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
return NULL;
}
#endif
- if (!q->filter_list || err < 0) {
+ if (!fl || err < 0) {
if (TC_H_MAJ(band))
band = 0;
return q->queues[q->prio2band[band & TC_PRIO_MAX]];
@@ -351,7 +353,8 @@ static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
}
}
-static struct tcf_proto **prio_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct prio_sched_data *q = qdisc_priv(sch);
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 8056fb4..602ea01 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -181,7 +181,7 @@ struct qfq_group {
};
struct qfq_sched {
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
struct Qdisc_class_hash clhash;
u64 oldV, V; /* Precise virtual times. */
@@ -576,7 +576,8 @@ static void qfq_put_class(struct Qdisc *sch, unsigned long arg)
qfq_destroy_class(sch, cl);
}
-static struct tcf_proto **qfq_tcf_chain(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **qfq_tcf_chain(struct Qdisc *sch,
+ unsigned long cl)
{
struct qfq_sched *q = qdisc_priv(sch);
@@ -704,6 +705,7 @@ static struct qfq_class *qfq_classify(struct sk_buff *skb, struct Qdisc *sch,
struct qfq_sched *q = qdisc_priv(sch);
struct qfq_class *cl;
struct tcf_result res;
+ struct tcf_proto *fl;
int result;
if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
@@ -714,7 +716,8 @@ static struct qfq_class *qfq_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) {
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index 9b0f709..1562fb2 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -55,7 +55,7 @@ struct sfb_bins {
struct sfb_sched_data {
struct Qdisc *qdisc;
- struct tcf_proto *filter_list;
+ struct tcf_proto __rcu *filter_list;
unsigned long rehash_interval;
unsigned long warmup_time; /* double buffering warmup time in jiffies */
u32 max;
@@ -253,13 +253,13 @@ static bool sfb_rate_limit(struct sk_buff *skb, struct sfb_sched_data *q)
return false;
}
-static bool sfb_classify(struct sk_buff *skb, struct sfb_sched_data *q,
+static bool sfb_classify(struct sk_buff *skb, struct tcf_proto *fl,
int *qerr, u32 *salt)
{
struct tcf_result res;
int result;
- result = tc_classify(skb, q->filter_list, &res);
+ result = tc_classify(skb, fl, &res);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
@@ -281,6 +281,7 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
struct sfb_sched_data *q = qdisc_priv(sch);
struct Qdisc *child = q->qdisc;
+ struct tcf_proto *fl;
int i;
u32 p_min = ~0;
u32 minqlen = ~0;
@@ -306,9 +307,10 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
}
}
- if (q->filter_list) {
+ fl = rcu_dereference_bh(q->filter_list);
+ if (fl) {
/* If using external classifiers, get result and record it. */
- if (!sfb_classify(skb, q, &ret, &salt))
+ if (!sfb_classify(skb, fl, &ret, &salt))
goto other_drop;
keys.src = salt;
keys.dst = 0;
@@ -660,7 +662,8 @@ static void sfb_walk(struct Qdisc *sch, struct qdisc_walker *walker)
}
}
-static struct tcf_proto **sfb_find_tcf(struct Qdisc *sch, unsigned long cl)
+static struct tcf_proto __rcu **sfb_find_tcf(struct Qdisc *sch,
+ unsigned long cl)
{
struct sfb_sched_data *q = qdisc_priv(sch);
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 211db90..80c36bd 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);
--
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