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net: sched: consolidate tc_classify{,_compat}

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For classifiers getting invoked via tc_classify(), we always need an
extra function call into tc_classify_compat(), as both are being
exported as symbols and tc_classify() itself doesn't do much except
handling of reclassifications when tp->classify() returned with
TC_ACT_RECLASSIFY.

CBQ and ATM are the only qdiscs that directly call into tc_classify_compat(),
all others use tc_classify(). When tc actions are being configured
out in the kernel, tc_classify() effectively does nothing besides
delegating.

We could spare this layer and consolidate both functions. pktgen on
single CPU constantly pushing skbs directly into the netif_receive_skb()
path with a dummy classifier on ingress qdisc attached, improves
slightly from 22.3Mpps to 23.1Mpps.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-08-26 23:00:06 +02:00 committed by David S. Miller
parent fe2188236a
commit 3b3ae88026
16 changed files with 40 additions and 47 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/net/pkt_sched.h
View file

@ -110,10 +110,8 @@ static inline void qdisc_run(struct Qdisc *q)
__qdisc_run(q);
}
int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
struct tcf_result *res, bool compat_mode);
static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
{

2
net/core/dev.c
View file

@ -3657,7 +3657,7 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
qdisc_bstats_cpu_update(cl->q, skb);
switch (tc_classify(skb, cl, &cl_res)) {
switch (tc_classify(skb, cl, &cl_res, false)) {
case TC_ACT_OK:
case TC_ACT_RECLASSIFY:
skb->tc_index = TC_H_MIN(cl_res.classid);

49
net/sched/sch_api.c
View file

@ -1806,51 +1806,46 @@ static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
* to this qdisc, (optionally) tests for protocol and asks
* specific classifiers.
*/
int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res, bool compat_mode)
{
__be16 protocol = tc_skb_protocol(skb);
#ifdef CONFIG_NET_CLS_ACT
const struct tcf_proto *old_tp = tp;
int limit = 0;
reclassify:
#endif
for (; tp; tp = rcu_dereference_bh(tp->next)) {
int err;
for (; tp; tp = rcu_dereference_bh(tp->next)) {
if (tp->protocol != protocol &&
tp->protocol != htons(ETH_P_ALL))
continue;
err = tp->classify(skb, tp, res);
err = tp->classify(skb, tp, res);
#ifdef CONFIG_NET_CLS_ACT
if (unlikely(err == TC_ACT_RECLASSIFY &&
!compat_mode))
goto reset;
#endif
if (err >= 0)
return err;
}
return -1;
}
EXPORT_SYMBOL(tc_classify_compat);
int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
int err = 0;
#ifdef CONFIG_NET_CLS_ACT
const struct tcf_proto *otp = tp;
int limit = 0;
reclassify:
#endif
err = tc_classify_compat(skb, tp, res);
#ifdef CONFIG_NET_CLS_ACT
if (err == TC_ACT_RECLASSIFY) {
tp = otp;
reset:
if (unlikely(limit++ >= MAX_REC_LOOP)) {
net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
tp->q->ops->id,
tp->prio & 0xffff,
ntohs(tp->protocol));
net_notice_ratelimited("%s: reclassify loop, rule prio %u, "
"protocol %02x\n", tp->q->ops->id,
tp->prio & 0xffff, ntohs(tp->protocol));
return TC_ACT_SHOT;
}
tp = old_tp;
goto reclassify;
}
#endif
return err;
}
EXPORT_SYMBOL(tc_classify);

2
net/sched/sch_atm.c
View file

@ -375,7 +375,7 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
list_for_each_entry(flow, &p->flows, list) {
fl = rcu_dereference_bh(flow->filter_list);
if (fl) {
result = tc_classify_compat(skb, fl, &res);
result = tc_classify(skb, fl, &res, true);
if (result < 0)
continue;
flow = (struct atm_flow_data *)res.class;

2
net/sched/sch_cbq.c
View file

@ -240,7 +240,7 @@ cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
/*
* Step 2+n. Apply classifier.
*/
result = tc_classify_compat(skb, fl, &res);
result = tc_classify(skb, fl, &res, true);
if (!fl || result < 0)
goto fallback;

2
net/sched/sch_choke.c
View file

@ -201,7 +201,7 @@ static bool choke_classify(struct sk_buff *skb,
int result;
fl = rcu_dereference_bh(q->filter_list);
result = tc_classify(skb, fl, &res);
result = tc_classify(skb, fl, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {

2
net/sched/sch_drr.c
View file

@ -331,7 +331,7 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
fl = rcu_dereference_bh(q->filter_list);
result = tc_classify(skb, fl, &res);
result = tc_classify(skb, fl, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {

2
net/sched/sch_dsmark.c
View file

@ -230,7 +230,7 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
else {
struct tcf_result res;
struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
int result = tc_classify(skb, fl, &res);
int result = tc_classify(skb, fl, &res, false);
pr_debug("result %d class 0x%04x\n", result, res.classid);

2
net/sched/sch_fq_codel.c
View file

@ -92,7 +92,7 @@ static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
return fq_codel_hash(q, skb) + 1;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
result = tc_classify(skb, filter, &res);
result = tc_classify(skb, filter, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {

2
net/sched/sch_hfsc.c
View file

@ -1165,7 +1165,7 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
head = &q->root;
tcf = rcu_dereference_bh(q->root.filter_list);
while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
while (tcf && (result = tc_classify(skb, tcf, &res, false)) >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
case TC_ACT_QUEUED:

2
net/sched/sch_htb.c
View file

@ -229,7 +229,7 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
}
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
while (tcf && (result = tc_classify(skb, tcf, &res, false)) >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
case TC_ACT_QUEUED:

2
net/sched/sch_multiq.c
View file

@ -46,7 +46,7 @@ multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
int err;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
err = tc_classify(skb, fl, &res);
err = tc_classify(skb, fl, &res, false);
#ifdef CONFIG_NET_CLS_ACT
switch (err) {
case TC_ACT_STOLEN:

2
net/sched/sch_prio.c
View file

@ -42,7 +42,7 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
if (TC_H_MAJ(skb->priority) != sch->handle) {
fl = rcu_dereference_bh(q->filter_list);
err = tc_classify(skb, fl, &res);
err = tc_classify(skb, fl, &res, false);
#ifdef CONFIG_NET_CLS_ACT
switch (err) {
case TC_ACT_STOLEN:

2
net/sched/sch_qfq.c
View file

@ -717,7 +717,7 @@ static struct qfq_class *qfq_classify(struct sk_buff *skb, struct Qdisc *sch,
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
fl = rcu_dereference_bh(q->filter_list);
result = tc_classify(skb, fl, &res);
result = tc_classify(skb, fl, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {

2
net/sched/sch_sfb.c
View file

@ -258,7 +258,7 @@ static bool sfb_classify(struct sk_buff *skb, struct tcf_proto *fl,
struct tcf_result res;
int result;
result = tc_classify(skb, fl, &res);
result = tc_classify(skb, fl, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {

2
net/sched/sch_sfq.c
View file

@ -179,7 +179,7 @@ static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch,
return sfq_hash(q, skb) + 1;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
result = tc_classify(skb, fl, &res);
result = tc_classify(skb, fl, &res, false);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {