Release 4.11 net/sched/cls_u32.c
/*
* net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* The filters are packed to hash tables of key nodes
* with a set of 32bit key/mask pairs at every node.
* Nodes reference next level hash tables etc.
*
* This scheme is the best universal classifier I managed to
* invent; it is not super-fast, but it is not slow (provided you
* program it correctly), and general enough. And its relative
* speed grows as the number of rules becomes larger.
*
* It seems that it represents the best middle point between
* speed and manageability both by human and by machine.
*
* It is especially useful for link sharing combined with QoS;
* pure RSVP doesn't need such a general approach and can use
* much simpler (and faster) schemes, sort of cls_rsvp.c.
*
* JHS: We should remove the CONFIG_NET_CLS_IND from here
* eventually when the meta match extension is made available
*
* nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/bitmap.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>
#include <linux/netdevice.h>
struct tc_u_knode {
struct tc_u_knode __rcu *next;
u32 handle;
struct tc_u_hnode __rcu *ht_up;
struct tcf_exts exts;
#ifdef CONFIG_NET_CLS_IND
int ifindex;
#endif
u8 fshift;
struct tcf_result res;
struct tc_u_hnode __rcu *ht_down;
#ifdef CONFIG_CLS_U32_PERF
struct tc_u32_pcnt __percpu *pf;
#endif
u32 flags;
#ifdef CONFIG_CLS_U32_MARK
u32 val;
u32 mask;
u32 __percpu *pcpu_success;
#endif
struct tcf_proto *tp;
struct rcu_head rcu;
/* The 'sel' field MUST be the last field in structure to allow for
* tc_u32_keys allocated at end of structure.
*/
struct tc_u32_sel sel;
};
struct tc_u_hnode {
struct tc_u_hnode __rcu *next;
u32 handle;
u32 prio;
struct tc_u_common *tp_c;
int refcnt;
unsigned int divisor;
struct rcu_head rcu;
/* The 'ht' field MUST be the last field in structure to allow for
* more entries allocated at end of structure.
*/
struct tc_u_knode __rcu *ht[1];
};
struct tc_u_common {
struct tc_u_hnode __rcu *hlist;
struct Qdisc *q;
int refcnt;
u32 hgenerator;
struct rcu_head rcu;
};
static inline unsigned int u32_hash_fold(__be32 key,
const struct tc_u32_sel *sel,
u8 fshift)
{
unsigned int h = ntohl(key & sel->hmask) >> fshift;
return h;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 25 | 65.79% | 1 | 16.67% |
Jamal Hadi Salim | 5 | 13.16% | 2 | 33.33% |
Eric Dumazet | 4 | 10.53% | 1 | 16.67% |
Radu Rendec | 3 | 7.89% | 1 | 16.67% |
Al Viro | 1 | 2.63% | 1 | 16.67% |
Total | 38 | 100.00% | 6 | 100.00% |
static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
struct {
struct tc_u_knode *knode;
unsigned int off;
} stack[TC_U32_MAXDEPTH];
struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
unsigned int off = skb_network_offset(skb);
struct tc_u_knode *n;
int sdepth = 0;
int off2 = 0;
int sel = 0;
#ifdef CONFIG_CLS_U32_PERF
int j;
#endif
int i, r;
next_ht:
n = rcu_dereference_bh(ht->ht[sel]);
next_knode:
if (n) {
struct tc_u32_key *key = n->sel.keys;
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->rcnt);
j = 0;
#endif
if (tc_skip_sw(n->flags)) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#ifdef CONFIG_CLS_U32_MARK
if ((skb->mark & n->mask) != n->val) {
n = rcu_dereference_bh(n->next);
goto next_knode;
} else {
__this_cpu_inc(*n->pcpu_success);
}
#endif
for (i = n->sel.nkeys; i > 0; i--, key++) {
int toff = off + key->off + (off2 & key->offmask);
__be32 *data, hdata;
if (skb_headroom(skb) + toff > INT_MAX)
goto out;
data = skb_header_pointer(skb, toff, 4, &hdata);
if (!data)
goto out;
if ((*data ^ key->val) & key->mask) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->kcnts[j]);
j++;
#endif
}
ht = rcu_dereference_bh(n->ht_down);
if (!ht) {
check_terminal:
if (n->sel.flags & TC_U32_TERMINAL) {
*res = n->res;
#ifdef CONFIG_NET_CLS_IND
if (!tcf_match_indev(skb, n->ifindex)) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
#endif
#ifdef CONFIG_CLS_U32_PERF
__this_cpu_inc(n->pf->rhit);
#endif
r = tcf_exts_exec(skb, &n->exts, res);
if (r < 0) {
n = rcu_dereference_bh(n->next);
goto next_knode;
}
return r;
}
n = rcu_dereference_bh(n->next);
goto next_knode;
}
/* PUSH */
if (sdepth >= TC_U32_MAXDEPTH)
goto deadloop;
stack[sdepth].knode = n;
stack[sdepth].off = off;
sdepth++;
ht = rcu_dereference_bh(n->ht_down);
sel = 0;
if (ht->divisor) {
__be32 *data, hdata;
data = skb_header_pointer(skb, off + n->sel.hoff, 4,
&hdata);
if (!data)
goto out;
sel = ht->divisor & u32_hash_fold(*data, &n->sel,
n->fshift);
}
if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
goto next_ht;
if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
off2 = n->sel.off + 3;
if (n->sel.flags & TC_U32_VAROFFSET) {
__be16 *data, hdata;
data = skb_header_pointer(skb,
off + n->sel.offoff,
2, &hdata);
if (!data)
goto out;
off2 += ntohs(n->sel.offmask & *data) >>
n->sel.offshift;
}
off2 &= ~3;
}
if (n->sel.flags & TC_U32_EAT) {
off += off2;
off2 = 0;
}
if (off < skb->len)
goto next_ht;
}
/* POP */
if (sdepth--) {
n = stack[sdepth].knode;
ht = rcu_dereference_bh(n->ht_up);
off = stack[sdepth].off;
goto check_terminal;
}
out:
return -1;
deadloop:
net_warn_ratelimited("cls_u32: dead loop\n");
return -1;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 415 | 52.80% | 2 | 9.09% |
Changli Gao | 116 | 14.76% | 1 | 4.55% |
Jamal Hadi Salim | 86 | 10.94% | 3 | 13.64% |
John Fastabend | 51 | 6.49% | 2 | 9.09% |
Catalin(ux aka Dino) M. Boie | 37 | 4.71% | 1 | 4.55% |
Stephen Hemminger | 25 | 3.18% | 2 | 9.09% |
Thomas Graf | 23 | 2.93% | 3 | 13.64% |
Sridhar Samudrala | 23 | 2.93% | 1 | 4.55% |
Dan Carpenter | 2 | 0.25% | 1 | 4.55% |
David S. Miller | 2 | 0.25% | 1 | 4.55% |
Arnaldo Carvalho de Melo | 2 | 0.25% | 1 | 4.55% |
Joe Perches | 1 | 0.13% | 1 | 4.55% |
Linus Torvalds | 1 | 0.13% | 1 | 4.55% |
Américo Wang | 1 | 0.13% | 1 | 4.55% |
Eric Dumazet | 1 | 0.13% | 1 | 4.55% |
Total | 786 | 100.00% | 22 | 100.00% |
static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
{
struct tc_u_hnode *ht;
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next))
if (ht->handle == handle)
break;
return ht;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 33 | 60.00% | 1 | 33.33% |
Eric Dumazet | 16 | 29.09% | 1 | 33.33% |
John Fastabend | 6 | 10.91% | 1 | 33.33% |
Total | 55 | 100.00% | 3 | 100.00% |
static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
{
unsigned int sel;
struct tc_u_knode *n = NULL;
sel = TC_U32_HASH(handle);
if (sel > ht->divisor)
goto out;
for (n = rtnl_dereference(ht->ht[sel]);
n;
n = rtnl_dereference(n->next))
if (n->handle == handle)
break;
out:
return n;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 68 | 80.95% | 1 | 25.00% |
Arnaldo Carvalho de Melo | 8 | 9.52% | 1 | 25.00% |
John Fastabend | 6 | 7.14% | 1 | 25.00% |
Eric Dumazet | 2 | 2.38% | 1 | 25.00% |
Total | 84 | 100.00% | 4 | 100.00% |
static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
{
struct tc_u_hnode *ht;
struct tc_u_common *tp_c = tp->data;
if (TC_U32_HTID(handle) == TC_U32_ROOT)
ht = rtnl_dereference(tp->root);
else
ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
if (!ht)
return 0;
if (TC_U32_KEY(handle) == 0)
return (unsigned long)ht;
return (unsigned long)u32_lookup_key(ht, handle);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 93 | 96.88% | 1 | 50.00% |
John Fastabend | 3 | 3.12% | 1 | 50.00% |
Total | 96 | 100.00% | 2 | 100.00% |
static u32 gen_new_htid(struct tc_u_common *tp_c)
{
int i = 0x800;
/* hgenerator only used inside rtnl lock it is safe to increment
* without read _copy_ update semantics
*/
do {
if (++tp_c->hgenerator == 0x7FF)
tp_c->hgenerator = 1;
} while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 73 | 97.33% | 1 | 33.33% |
Linus Torvalds | 1 | 1.33% | 1 | 33.33% |
John Fastabend | 1 | 1.33% | 1 | 33.33% |
Total | 75 | 100.00% | 3 | 100.00% |
static int u32_init(struct tcf_proto *tp)
{
struct tc_u_hnode *root_ht;
struct tc_u_common *tp_c;
tp_c = tp->q->u32_node;
root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
if (root_ht == NULL)
return -ENOBUFS;
root_ht->refcnt++;
root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
root_ht->prio = tp->prio;
if (tp_c == NULL) {
tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
if (tp_c == NULL) {
kfree(root_ht);
return -ENOBUFS;
}
tp_c->q = tp->q;
tp->q->u32_node = tp_c;
}
tp_c->refcnt++;
RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
rcu_assign_pointer(tp_c->hlist, root_ht);
root_ht->tp_c = tp_c;
rcu_assign_pointer(tp->root, root_ht);
tp->data = tp_c;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 152 | 83.98% | 1 | 20.00% |
John Fastabend | 12 | 6.63% | 1 | 20.00% |
Patrick McHardy | 8 | 4.42% | 1 | 20.00% |
David S. Miller | 7 | 3.87% | 1 | 20.00% |
Panagiotis Issaris | 2 | 1.10% | 1 | 20.00% |
Total | 181 | 100.00% | 5 | 100.00% |
static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
bool free_pf)
{
tcf_exts_destroy(&n->exts);
if (n->ht_down)
n->ht_down->refcnt--;
#ifdef CONFIG_CLS_U32_PERF
if (free_pf)
free_percpu(n->pf);
#endif
#ifdef CONFIG_CLS_U32_MARK
if (free_pf)
free_percpu(n->pcpu_success);
#endif
kfree(n);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 41 | 51.25% | 1 | 14.29% |
John Fastabend | 24 | 30.00% | 3 | 42.86% |
Jamal Hadi Salim | 12 | 15.00% | 2 | 28.57% |
Thomas Graf | 3 | 3.75% | 1 | 14.29% |
Total | 80 | 100.00% | 7 | 100.00% |
/* u32_delete_key_rcu should be called when free'ing a copied
* version of a tc_u_knode obtained from u32_init_knode(). When
* copies are obtained from u32_init_knode() the statistics are
* shared between the old and new copies to allow readers to
* continue to update the statistics during the copy. To support
* this the u32_delete_key_rcu variant does not free the percpu
* statistics.
*/
static void u32_delete_key_rcu(struct rcu_head *rcu)
{
struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
u32_destroy_key(key->tp, key, false);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 37 | 100.00% | 2 | 100.00% |
Total | 37 | 100.00% | 2 | 100.00% |
/* u32_delete_key_freepf_rcu is the rcu callback variant
* that free's the entire structure including the statistics
* percpu variables. Only use this if the key is not a copy
* returned by u32_init_knode(). See u32_delete_key_rcu()
* for the variant that should be used with keys return from
* u32_init_knode()
*/
static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
{
struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
u32_destroy_key(key->tp, key, true);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 37 | 100.00% | 2 | 100.00% |
Total | 37 | 100.00% | 2 | 100.00% |
static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
{
struct tc_u_knode __rcu **kp;
struct tc_u_knode *pkp;
struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
if (ht) {
kp = &ht->ht[TC_U32_HASH(key->handle)];
for (pkp = rtnl_dereference(*kp); pkp;
kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
if (pkp == key) {
RCU_INIT_POINTER(*kp, key->next);
tcf_unbind_filter(tp, &key->res);
call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
return 0;
}
}
}
WARN_ON(1);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 90 | 64.75% | 3 | 37.50% |
John Fastabend | 37 | 26.62% | 3 | 37.50% |
Américo Wang | 10 | 7.19% | 1 | 12.50% |
Ilpo Järvinen | 2 | 1.44% | 1 | 12.50% |
Total | 139 | 100.00% | 8 | 100.00% |
static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_u32_offload u32_offload = {0};
struct tc_to_netdev offload;
offload.type = TC_SETUP_CLSU32;
offload.cls_u32 = &u32_offload;
if (tc_should_offload(dev, tp, 0)) {
offload.cls_u32->command = TC_CLSU32_DELETE_KNODE;
offload.cls_u32->knode.handle = handle;
dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
tp->protocol, &offload);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 103 | 98.10% | 3 | 75.00% |
Daniel Borkmann | 2 | 1.90% | 1 | 25.00% |
Total | 105 | 100.00% | 4 | 100.00% |
static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
u32 flags)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_u32_offload u32_offload = {0};
struct tc_to_netdev offload;
int err;
if (!tc_should_offload(dev, tp, flags))
return tc_skip_sw(flags) ? -EINVAL : 0;
offload.type = TC_SETUP_CLSU32;
offload.cls_u32 = &u32_offload;
offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
offload.cls_u32->hnode.divisor = h->divisor;
offload.cls_u32->hnode.handle = h->handle;
offload.cls_u32->hnode.prio = h->prio;
err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
tp->protocol, &offload);
if (tc_skip_sw(flags))
return err;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 122 | 74.39% | 2 | 40.00% |
Jakub Kiciński | 21 | 12.80% | 1 | 20.00% |
Sridhar Samudrala | 19 | 11.59% | 1 | 20.00% |
Daniel Borkmann | 2 | 1.22% | 1 | 20.00% |
Total | 164 | 100.00% | 5 | 100.00% |
static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_u32_offload u32_offload = {0};
struct tc_to_netdev offload;
offload.type = TC_SETUP_CLSU32;
offload.cls_u32 = &u32_offload;
if (tc_should_offload(dev, tp, 0)) {
offload.cls_u32->command = TC_CLSU32_DELETE_HNODE;
offload.cls_u32->hnode.divisor = h->divisor;
offload.cls_u32->hnode.handle = h->handle;
offload.cls_u32->hnode.prio = h->prio;
dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
tp->protocol, &offload);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 131 | 98.50% | 3 | 75.00% |
Daniel Borkmann | 2 | 1.50% | 1 | 25.00% |
Total | 133 | 100.00% | 4 | 100.00% |
static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
u32 flags)
{
struct net_device *dev = tp->q->dev_queue->dev;
struct tc_cls_u32_offload u32_offload = {0};
struct tc_to_netdev offload;
int err;
offload.type = TC_SETUP_CLSU32;
offload.cls_u32 = &u32_offload;
if (!tc_should_offload(dev, tp, flags))
return tc_skip_sw(flags) ? -EINVAL : 0;
offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
offload.cls_u32->knode.handle = n->handle;
offload.cls_u32->knode.fshift = n->fshift;
#ifdef CONFIG_CLS_U32_MARK
offload.cls_u32->knode.val = n->val;
offload.cls_u32->knode.mask = n->mask;
#else
offload.cls_u32->knode.val = 0;
offload.cls_u32->knode.mask = 0;
#endif
offload.cls_u32->knode.sel = &n->sel;
offload.cls_u32->knode.exts = &n->exts;
if (n->ht_down)
offload.cls_u32->knode.link_handle = n->ht_down->handle;
err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
tp->protocol, &offload);
if (!err)
n->flags |= TCA_CLS_FLAGS_IN_HW;
if (tc_skip_sw(flags))
return err;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Fastabend | 216 | 83.08% | 3 | 42.86% |
Sridhar Samudrala | 19 | 7.31% | 1 | 14.29% |
Jakub Kiciński | 12 | 4.62% | 1 | 14.29% |
Or Gerlitz | 11 | 4.23% | 1 | 14.29% |
Daniel Borkmann | 2 | 0.77% | 1 | 14.29% |
Total | 260 | 100.00% | 7 | 100.00% |
static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
struct tc_u_knode *n;
unsigned int h;
for (h = 0; h <= ht->divisor; h++) {
while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
RCU_INIT_POINTER(ht->ht[h],
rtnl_dereference(n->next));
tcf_unbind_filter(tp, &n->res);
u32_remove_hw_knode(tp, n->handle);
call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
}
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 67 | 62.04% | 1 | 16.67% |
John Fastabend | 25 | 23.15% | 3 | 50.00% |
Américo Wang | 15 | 13.89% | 1 | 16.67% |
Eric Dumazet | 1 | 0.93% | 1 | 16.67% |
Total | 108 | 100.00% | 6 | 100.00% |
static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode __rcu **hn;
struct tc_u_hnode *phn;
WARN_ON(ht->refcnt);
u32_clear_hnode(tp, ht);
hn = &tp_c->hlist;
for (phn = rtnl_dereference(*hn);
phn;
hn = &phn->next, phn = rtnl_dereference(*hn)) {
if (phn == ht) {
u32_clear_hw_hnode(tp, ht);
RCU_INIT_POINTER(*hn, ht->next);
kfree_rcu(ht, rcu);
return 0;
}
}
return -ENOENT;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 83 | 65.87% | 1 | 20.00% |
John Fastabend | 40 | 31.75% | 2 | 40.00% |
Américo Wang | 2 | 1.59% | 1 | 20.00% |
Ilpo Järvinen | 1 | 0.79% | 1 | 20.00% |
Total | 126 | 100.00% | 5 | 100.00% |
static bool ht_empty(struct tc_u_hnode *ht)
{
unsigned int h;
for (h = 0; h <= ht->divisor; h++)
if (rcu_access_pointer(ht->ht[h]))
return false;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Cong Wang | 48 | 100.00% | 1 | 100.00% |
Total | 48 | 100.00% | 1 | 100.00% |
static bool u32_destroy(struct tcf_proto *tp, bool force)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
WARN_ON(root_ht == NULL);
if (!force) {
if (root_ht) {
if (root_ht->refcnt > 1)
return false;
if (root_ht->refcnt == 1) {
if (!ht_empty(root_ht))
return false;
}
}
if (tp_c->refcnt > 1)
return false;
if (tp_c->refcnt == 1) {
struct tc_u_hnode *ht;
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next))
if (!ht_empty(ht))
return false;
}
}
if (root_ht && --root_ht->refcnt == 0)
u32_destroy_hnode(tp, root_ht);
if (--tp_c->refcnt == 0) {
struct tc_u_hnode *ht;
tp->q->u32_node = NULL;
for (ht = rtnl_dereference(tp_c->hlist);
ht;
ht = rtnl_dereference(ht->next)) {
ht->refcnt--;
u32_clear_hnode(tp, ht);
}
while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
RCU_INIT_POINTER(tp_c->hlist, ht->next);
kfree_rcu(ht, rcu);
}
kfree(tp_c);
}
tp->data = NULL;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 128 | 46.89% | 1 | 12.50% |
Américo Wang | 61 | 22.34% | 2 | 25.00% |
Cong Wang | 52 | 19.05% | 1 | 12.50% |
John Fastabend | 18 | 6.59% | 1 | 12.50% |
Jarek Poplawski | 7 | 2.56% | 1 | 12.50% |
David S. Miller | 5 | 1.83% | 1 | 12.50% |
Ilpo Järvinen | 2 | 0.73% | 1 | 12.50% |
Total | 273 | 100.00% | 8 | 100.00% |
static int u32_delete(struct tcf_proto *tp