[PATCH 07/62] idr: Rewrite extended IDR API

From: Matthew Wilcox
Date: Wed Nov 22 2017 - 16:35:13 EST

From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>

Rename the API to be 'ul' for unsigned long instead of 'ext'. This fits
better with other usage in the Linux kernel.

- idr_replace(), idr_remove() and idr_find() can simply take an unsigned
long index instead of an int.
- idr_alloc() turns back into a regular function.
- idr_alloc_ul() takes 'nextid' as an in-out parameter like idr_get_next(),
instead of having 'index' as an out-only parameter.
- idr_alloc_ul() needs a __must_check to ensure that users don't look at
the result without checking whether the function succeeded.
- idr_alloc_ul() takes 'max' rather than 'end', or it is impossible to
allocate the ULONG_MAX id. This differs from idr_alloc(), but so do
many other things.
- We don't need separate idr_get_free() and idr_get_free_ext().
- Add kerneldoc for idr_alloc_ul().
- Add an idr_alloc_u32() helper for the majority of existing users.

Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
---
include/linux/idr.h | 80 ++++++++----------------------------
include/linux/radix-tree.h | 17 +-------
lib/idr.c | 100 +++++++++++++++++++++++++++++++++------------
lib/radix-tree.c | 2 +-
net/sched/act_api.c | 60 +++++++++++++--------------
net/sched/cls_basic.c | 20 ++++-----
net/sched/cls_bpf.c | 20 ++++-----
net/sched/cls_flower.c | 32 ++++++---------
net/sched/cls_u32.c | 44 +++++++++-----------
9 files changed, 171 insertions(+), 204 deletions(-)

diff --git a/include/linux/idr.h b/include/linux/idr.h
index 10bfe62423df..87ae635fcee6 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -54,73 +54,30 @@ struct idr {

void idr_preload(gfp_t gfp_mask);

-int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
- unsigned long start, unsigned long end, gfp_t gfp,
- bool ext);
-
-/**
- * idr_alloc - allocate an id
- * @idr: idr handle
- * @ptr: pointer to be associated with the new id
- * @start: the minimum id (inclusive)
- * @end: the maximum id (exclusive)
- * @gfp: memory allocation flags
- *
- * Allocates an unused ID in the range [start, end). Returns -ENOSPC
- * if there are no unused IDs in that range.
- *
- * Note that @end is treated as max when <= 0. This is to always allow
- * using @start + N as @end as long as N is inside integer range.
- *
- * Simultaneous modifications to the @idr are not allowed and should be
- * prevented by the user, usually with a lock. idr_alloc() may be called
- * concurrently with read-only accesses to the @idr, such as idr_find() and
- * idr_for_each_entry().
- */
-static inline int idr_alloc(struct idr *idr, void *ptr,
- int start, int end, gfp_t gfp)
-{
- unsigned long id;
- int ret;
-
- if (WARN_ON_ONCE(start < 0))
- return -EINVAL;
-
- ret = idr_alloc_cmn(idr, ptr, &id, start, end, gfp, false);
-
- if (ret)
- return ret;
-
- return id;
-}
-
-static inline int idr_alloc_ext(struct idr *idr, void *ptr,
- unsigned long *index,
- unsigned long start,
- unsigned long end,
- gfp_t gfp)
-{
- return idr_alloc_cmn(idr, ptr, index, start, end, gfp, true);
-}
-
+int idr_alloc(struct idr *, void *, int start, int end, gfp_t);
+int __must_check idr_alloc_ul(struct idr *, void *, unsigned long *nextid,
+ unsigned long max, gfp_t);
int idr_alloc_cyclic(struct idr *, int *cursor, void *entry,
int start, int end, gfp_t);
int idr_for_each(const struct idr *,
int (*fn)(int id, void *p, void *data), void *data);
void *idr_get_next(struct idr *, int *nextid);
-void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);
-void *idr_replace(struct idr *, void *, int id);
-void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id);
+void *idr_get_next_ul(struct idr *, unsigned long *nextid);
+void *idr_replace(struct idr *, void *, unsigned long id);
void idr_destroy(struct idr *);

-static inline void *idr_remove_ext(struct idr *idr, unsigned long id)
+static inline int __must_check idr_alloc_u32(struct idr *idr, void *ptr,
+ u32 *nextid, unsigned long max, gfp_t gfp)
{
- return radix_tree_delete_item(&idr->idr_rt, id, NULL);
+ unsigned long tmp = *nextid;
+ int ret = idr_alloc_ul(idr, ptr, &tmp, max, gfp);
+ *nextid = tmp;
+ return ret;
}

-static inline void *idr_remove(struct idr *idr, int id)
+static inline void *idr_remove(struct idr *idr, unsigned long id)
{
- return idr_remove_ext(idr, id);
+ return radix_tree_delete_item(&idr->idr_rt, id, NULL);
}

static inline void idr_init(struct idr *idr)
@@ -157,16 +114,11 @@ static inline void idr_preload_end(void)
* This function can be called under rcu_read_lock(), given that the leaf
* pointers lifetimes are correctly managed.
*/
-static inline void *idr_find_ext(const struct idr *idr, unsigned long id)
+static inline void *idr_find(const struct idr *idr, unsigned long id)
{
return radix_tree_lookup(&idr->idr_rt, id);
}

-static inline void *idr_find(const struct idr *idr, int id)
-{
- return idr_find_ext(idr, id);
-}
-
/**
* idr_for_each_entry - iterate over an idr's elements of a given type
* @idr: idr handle
@@ -179,8 +131,8 @@ static inline void *idr_find(const struct idr *idr, int id)
*/
#define idr_for_each_entry(idr, entry, id) \
for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; ++id)
-#define idr_for_each_entry_ext(idr, entry, id) \
- for (id = 0; ((entry) = idr_get_next_ext(idr, &(id))) != NULL; ++id)
+#define idr_for_each_entry_ul(idr, entry, id) \
+ for (id = 0; ((entry) = idr_get_next_ul(idr, &(id))) != NULL; ++id)

/**
* idr_for_each_entry_continue - continue iteration over an idr's elements of a given type
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 23a9c89c7ad9..fc55ff31eca7 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -356,24 +356,9 @@ int radix_tree_split(struct radix_tree_root *, unsigned long index,
int radix_tree_join(struct radix_tree_root *, unsigned long index,
unsigned new_order, void *);

-void __rcu **idr_get_free_cmn(struct radix_tree_root *root,
+void __rcu **idr_get_free(struct radix_tree_root *root,
struct radix_tree_iter *iter, gfp_t gfp,
unsigned long max);
-static inline void __rcu **idr_get_free(struct radix_tree_root *root,
- struct radix_tree_iter *iter,
- gfp_t gfp,
- int end)
-{
- return idr_get_free_cmn(root, iter, gfp, end > 0 ? end - 1 : INT_MAX);
-}
-
-static inline void __rcu **idr_get_free_ext(struct radix_tree_root *root,
- struct radix_tree_iter *iter,
- gfp_t gfp,
- unsigned long end)
-{
- return idr_get_free_cmn(root, iter, gfp, end - 1);
-}

enum {
RADIX_TREE_ITER_TAG_MASK = 0x0f, /* tag index in lower nybble */
diff --git a/lib/idr.c b/lib/idr.c
index 26cb99412b8f..35678388e134 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -7,9 +7,26 @@
DEFINE_PER_CPU(struct ida_bitmap *, ida_bitmap);
static DEFINE_SPINLOCK(simple_ida_lock);

-int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
- unsigned long start, unsigned long end, gfp_t gfp,
- bool ext)
+/**
+ * idr_alloc_ul() - allocate a large ID
+ * @idr: idr handle
+ * @ptr: pointer to be associated with the new ID
+ * @nextid: Pointer to minimum ID to allocate
+ * @max: the maximum ID (inclusive)
+ * @gfp: memory allocation flags
+ *
+ * Allocates an unused ID in the range [*nextid, end] and stores it in
+ * @nextid. Note that @max differs from the @end parameter to idr_alloc().
+ *
+ * Simultaneous modifications to the @idr are not allowed and should be
+ * prevented by the user, usually with a lock. idr_alloc_ul() may be called
+ * concurrently with read-only accesses to the @idr, such as idr_find() and
+ * idr_for_each_entry().
+ *
+ * Return: 0 on success or a negative errno on failure (ENOMEM or ENOSPC)
+ */
+int idr_alloc_ul(struct idr *idr, void *ptr, unsigned long *nextid,
+ unsigned long max, gfp_t gfp)
{
struct radix_tree_iter iter;
void __rcu **slot;
@@ -20,22 +37,54 @@ int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
if (WARN_ON_ONCE(!(idr->idr_rt.gfp_mask & ROOT_IS_IDR)))
idr->idr_rt.gfp_mask |= IDR_RT_MARKER;

- radix_tree_iter_init(&iter, start);
- if (ext)
- slot = idr_get_free_ext(&idr->idr_rt, &iter, gfp, end);
- else
- slot = idr_get_free(&idr->idr_rt, &iter, gfp, end);
+ radix_tree_iter_init(&iter, *nextid);
+ slot = idr_get_free(&idr->idr_rt, &iter, gfp, max);
if (IS_ERR(slot))
return PTR_ERR(slot);

radix_tree_iter_replace(&idr->idr_rt, &iter, slot, ptr);
radix_tree_iter_tag_clear(&idr->idr_rt, &iter, IDR_FREE);

- if (index)
- *index = iter.index;
+ *nextid = iter.index;
return 0;
}
-EXPORT_SYMBOL_GPL(idr_alloc_cmn);
+EXPORT_SYMBOL_GPL(idr_alloc_ul);
+
+/**
+ * idr_alloc - allocate an id
+ * @idr: idr handle
+ * @ptr: pointer to be associated with the new id
+ * @start: the minimum id (inclusive)
+ * @end: the maximum id (exclusive)
+ * @gfp: memory allocation flags
+ *
+ * Allocates an unused ID in the range [start, end). Returns -ENOSPC
+ * if there are no unused IDs in that range.
+ *
+ * Note that @end is treated as max when <= 0. This is to always allow
+ * using @start + N as @end as long as N is inside integer range.
+ *
+ * Simultaneous modifications to the @idr are not allowed and should be
+ * prevented by the user, usually with a lock. idr_alloc() may be called
+ * concurrently with read-only accesses to the @idr, such as idr_find() and
+ * idr_for_each_entry().
+ */
+int idr_alloc(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
+{
+ unsigned long id = start;
+ int ret;
+
+ if (WARN_ON_ONCE(start < 0))
+ return -EINVAL;
+
+ ret = idr_alloc_ul(idr, ptr, &id, end > 0 ? end - 1 : INT_MAX, gfp);
+
+ if (ret)
+ return ret;
+
+ return id;
+}
+EXPORT_SYMBOL_GPL(idr_alloc);

/**
* idr_alloc_cyclic() - Allocate new idr entry in a cyclical fashion.
@@ -126,7 +175,17 @@ void *idr_get_next(struct idr *idr, int *nextid)
}
EXPORT_SYMBOL(idr_get_next);

-void *idr_get_next_ext(struct idr *idr, unsigned long *nextid)
+/**
+ * idr_get_next_ul - Find next populated entry
+ * @idr: idr handle
+ * @nextid: Pointer to lowest possible ID to return
+ *
+ * Returns the next populated entry in the tree with an ID greater than
+ * or equal to the value pointed to by @nextid. On exit, @nextid is updated
+ * to the ID of the found value. To use in a loop, the value pointed to by
+ * nextid must be incremented by the user.
+ */
+void *idr_get_next_ul(struct idr *idr, unsigned long *nextid)
{
struct radix_tree_iter iter;
void __rcu **slot;
@@ -138,7 +197,7 @@ void *idr_get_next_ext(struct idr *idr, unsigned long *nextid)
*nextid = iter.index;
return rcu_dereference_raw(*slot);
}
-EXPORT_SYMBOL(idr_get_next_ext);
+EXPORT_SYMBOL(idr_get_next_ul);

/**
* idr_replace - replace pointer for given id
@@ -154,16 +213,7 @@ EXPORT_SYMBOL(idr_get_next_ext);
* Returns: the old value on success. %-ENOENT indicates that @id was not
* found. %-EINVAL indicates that @id or @ptr were not valid.
*/
-void *idr_replace(struct idr *idr, void *ptr, int id)
-{
- if (id < 0)
- return ERR_PTR(-EINVAL);
-
- return idr_replace_ext(idr, ptr, id);
-}
-EXPORT_SYMBOL(idr_replace);
-
-void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id)
+void *idr_replace(struct idr *idr, void *ptr, unsigned long id)
{
struct radix_tree_node *node;
void __rcu **slot = NULL;
@@ -180,7 +230,7 @@ void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id)

return entry;
}
-EXPORT_SYMBOL(idr_replace_ext);
+EXPORT_SYMBOL(idr_replace);

/**
* DOC: IDA description
@@ -240,7 +290,7 @@ EXPORT_SYMBOL(idr_replace_ext);
* bitmap, which is excessive.
*/

-#define IDA_MAX (0x80000000U / IDA_BITMAP_BITS)
+#define IDA_MAX (0x80000000U / IDA_BITMAP_BITS - 1)

/**
* ida_get_new_above - allocate new ID above or equal to a start id
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index f00303e0b216..6d29ca4c8db0 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -2135,7 +2135,7 @@ int ida_pre_get(struct ida *ida, gfp_t gfp)
}
EXPORT_SYMBOL(ida_pre_get);

-void __rcu **idr_get_free_cmn(struct radix_tree_root *root,
+void __rcu **idr_get_free(struct radix_tree_root *root,
struct radix_tree_iter *iter, gfp_t gfp,
unsigned long max)
{
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 4d33a50a8a6d..a6aa606b5e99 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -78,7 +78,7 @@ static void free_tcf(struct tc_action *p)
static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
{
spin_lock_bh(&idrinfo->lock);
- idr_remove_ext(&idrinfo->action_idr, p->tcfa_index);
+ idr_remove(&idrinfo->action_idr, p->tcfa_index);
spin_unlock_bh(&idrinfo->lock);
gen_kill_estimator(&p->tcfa_rate_est);
free_tcf(p);
@@ -124,7 +124,7 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,

s_i = cb->args[0];

- idr_for_each_entry_ext(idr, p, id) {
+ idr_for_each_entry_ul(idr, p, id) {
index++;
if (index < s_i)
continue;
@@ -181,7 +181,7 @@ static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
if (nla_put_string(skb, TCA_KIND, ops->kind))
goto nla_put_failure;

- idr_for_each_entry_ext(idr, p, id) {
+ idr_for_each_entry_ul(idr, p, id) {
ret = __tcf_idr_release(p, false, true);
if (ret == ACT_P_DELETED) {
module_put(ops->owner);
@@ -219,10 +219,10 @@ EXPORT_SYMBOL(tcf_generic_walker);

static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
{
- struct tc_action *p = NULL;
+ struct tc_action *p;

spin_lock_bh(&idrinfo->lock);
- p = idr_find_ext(&idrinfo->action_idr, index);
+ p = idr_find(&idrinfo->action_idr, index);
spin_unlock_bh(&idrinfo->lock);

return p;
@@ -274,7 +274,6 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
struct tcf_idrinfo *idrinfo = tn->idrinfo;
struct idr *idr = &idrinfo->action_idr;
int err = -ENOMEM;
- unsigned long idr_index;

if (unlikely(!p))
return -ENOMEM;
@@ -284,45 +283,34 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,

if (cpustats) {
p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
- if (!p->cpu_bstats) {
-err1:
- kfree(p);
- return err;
- }
- p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
- if (!p->cpu_qstats) {
-err2:
- free_percpu(p->cpu_bstats);
+ if (!p->cpu_bstats)
goto err1;
- }
+ p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
+ if (!p->cpu_qstats)
+ goto err2;
}
spin_lock_init(&p->tcfa_lock);
/* user doesn't specify an index */
if (!index) {
+ index = 1;
idr_preload(GFP_KERNEL);
spin_lock_bh(&idrinfo->lock);
- err = idr_alloc_ext(idr, NULL, &idr_index, 1, 0,
- GFP_ATOMIC);
+ err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
spin_unlock_bh(&idrinfo->lock);
idr_preload_end();
- if (err) {
-err3:
- free_percpu(p->cpu_qstats);
- goto err2;
- }
- p->tcfa_index = idr_index;
+ if (err)
+ goto err3;
} else {
idr_preload(GFP_KERNEL);
spin_lock_bh(&idrinfo->lock);
- err = idr_alloc_ext(idr, NULL, NULL, index, index + 1,
- GFP_ATOMIC);
+ err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
spin_unlock_bh(&idrinfo->lock);
idr_preload_end();
if (err)
goto err3;
- p->tcfa_index = index;
}

+ p->tcfa_index = index;
p->tcfa_tm.install = jiffies;
p->tcfa_tm.lastuse = jiffies;
p->tcfa_tm.firstuse = 0;
@@ -330,9 +318,8 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
&p->tcfa_rate_est,
&p->tcfa_lock, NULL, est);
- if (err) {
- goto err3;
- }
+ if (err)
+ goto err4;
}

p->idrinfo = idrinfo;
@@ -340,6 +327,15 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
INIT_LIST_HEAD(&p->list);
*a = p;
return 0;
+err4:
+ idr_remove(idr, index);
+err3:
+ free_percpu(p->cpu_qstats);
+err2:
+ free_percpu(p->cpu_bstats);
+err1:
+ kfree(p);
+ return err;
}
EXPORT_SYMBOL(tcf_idr_create);

@@ -348,7 +344,7 @@ void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
struct tcf_idrinfo *idrinfo = tn->idrinfo;

spin_lock_bh(&idrinfo->lock);
- idr_replace_ext(&idrinfo->action_idr, a, a->tcfa_index);
+ idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
spin_unlock_bh(&idrinfo->lock);
}
EXPORT_SYMBOL(tcf_idr_insert);
@@ -361,7 +357,7 @@ void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
int ret;
unsigned long id = 1;

- idr_for_each_entry_ext(idr, p, id) {
+ idr_for_each_entry_ul(idr, p, id) {
ret = __tcf_idr_release(p, false, true);
if (ret == ACT_P_DELETED)
module_put(ops->owner);
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 5f169ded347e..c2ff835639ed 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -120,7 +120,7 @@ static void basic_destroy(struct tcf_proto *tp)
list_for_each_entry_safe(f, n, &head->flist, link) {
list_del_rcu(&f->link);
tcf_unbind_filter(tp, &f->res);
- idr_remove_ext(&head->handle_idr, f->handle);
+ idr_remove(&head->handle_idr, f->handle);
if (tcf_exts_get_net(&f->exts))
call_rcu(&f->rcu, basic_delete_filter);
else
@@ -137,7 +137,7 @@ static int basic_delete(struct tcf_proto *tp, void *arg, bool *last)

list_del_rcu(&f->link);
tcf_unbind_filter(tp, &f->res);
- idr_remove_ext(&head->handle_idr, f->handle);
+ idr_remove(&head->handle_idr, f->handle);
tcf_exts_get_net(&f->exts);
call_rcu(&f->rcu, basic_delete_filter);
*last = list_empty(&head->flist);
@@ -182,7 +182,6 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
struct nlattr *tb[TCA_BASIC_MAX + 1];
struct basic_filter *fold = (struct basic_filter *) *arg;
struct basic_filter *fnew;
- unsigned long idr_index;

if (tca[TCA_OPTIONS] == NULL)
return -EINVAL;
@@ -208,30 +207,29 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
if (handle) {
fnew->handle = handle;
if (!fold) {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- handle, handle + 1, GFP_KERNEL);
+ err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+ handle, GFP_KERNEL);
if (err)
goto errout;
}
} else {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- 1, 0x7FFFFFFF, GFP_KERNEL);
- if (err)
+ err = idr_alloc(&head->handle_idr, fnew, 1, 0, GFP_KERNEL);
+ if (err < 0)
goto errout;
- fnew->handle = idr_index;
+ fnew->handle = err;
}

err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
if (err < 0) {
if (!fold)
- idr_remove_ext(&head->handle_idr, fnew->handle);
+ idr_remove(&head->handle_idr, fnew->handle);
goto errout;
}

*arg = fnew;

if (fold) {
- idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
+ idr_replace(&head->handle_idr, fnew, fnew->handle);
list_replace_rcu(&fold->link, &fnew->link);
tcf_unbind_filter(tp, &fold->res);
tcf_exts_get_net(&fold->exts);
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index fb680dafac5a..b575d41543df 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -294,7 +294,7 @@ static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
{
struct cls_bpf_head *head = rtnl_dereference(tp->root);

- idr_remove_ext(&head->handle_idr, prog->handle);
+ idr_remove(&head->handle_idr, prog->handle);
cls_bpf_stop_offload(tp, prog);
list_del_rcu(&prog->link);
tcf_unbind_filter(tp, &prog->res);
@@ -469,7 +469,6 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
struct cls_bpf_prog *oldprog = *arg;
struct nlattr *tb[TCA_BPF_MAX + 1];
struct cls_bpf_prog *prog;
- unsigned long idr_index;
int ret;

if (tca[TCA_OPTIONS] == NULL)
@@ -496,15 +495,14 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
}

if (handle == 0) {
- ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index,
- 1, 0x7FFFFFFF, GFP_KERNEL);
- if (ret)
+ ret = idr_alloc(&head->handle_idr, prog, 1, 0, GFP_KERNEL);
+ if (ret < 0)
goto errout;
- prog->handle = idr_index;
+ prog->handle = ret;
} else {
if (!oldprog) {
- ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index,
- handle, handle + 1, GFP_KERNEL);
+ ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
+ handle, GFP_KERNEL);
if (ret)
goto errout;
}
@@ -518,7 +516,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
ret = cls_bpf_offload(tp, prog, oldprog);
if (ret) {
if (!oldprog)
- idr_remove_ext(&head->handle_idr, prog->handle);
+ idr_remove(&head->handle_idr, prog->handle);
__cls_bpf_delete_prog(prog);
return ret;
}
@@ -527,7 +525,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;

if (oldprog) {
- idr_replace_ext(&head->handle_idr, prog, handle);
+ idr_replace(&head->handle_idr, prog, handle);
list_replace_rcu(&oldprog->link, &prog->link);
tcf_unbind_filter(tp, &oldprog->res);
tcf_exts_get_net(&oldprog->exts);
@@ -541,7 +539,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,

errout_idr:
if (!oldprog)
- idr_remove_ext(&head->handle_idr, prog->handle);
+ idr_remove(&head->handle_idr, prog->handle);
errout:
tcf_exts_destroy(&prog->exts);
kfree(prog);
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 543a3e875d05..0867fa7bef5b 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -283,7 +283,7 @@ static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
{
struct cls_fl_head *head = rtnl_dereference(tp->root);

- idr_remove_ext(&head->handle_idr, f->handle);
+ idr_remove(&head->handle_idr, f->handle);
list_del_rcu(&f->list);
if (!tc_skip_hw(f->flags))
fl_hw_destroy_filter(tp, f);
@@ -329,7 +329,7 @@ static void *fl_get(struct tcf_proto *tp, u32 handle)
{
struct cls_fl_head *head = rtnl_dereference(tp->root);

- return idr_find_ext(&head->handle_idr, handle);
+ return idr_find(&head->handle_idr, handle);
}

static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
@@ -858,7 +858,6 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
struct cls_fl_filter *fnew;
struct nlattr **tb;
struct fl_flow_mask mask = {};
- unsigned long idr_index;
int err;

if (!tca[TCA_OPTIONS])
@@ -889,21 +888,15 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
goto errout;

if (!handle) {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- 1, 0x80000000, GFP_KERNEL);
- if (err)
- goto errout;
- fnew->handle = idr_index;
- }
-
- /* user specifies a handle and it doesn't exist */
- if (handle && !fold) {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- handle, handle + 1, GFP_KERNEL);
- if (err)
- goto errout;
- fnew->handle = idr_index;
+ err = idr_alloc(&head->handle_idr, fnew, 1, 0, GFP_KERNEL);
+ } else if (!fold) {
+ /* user specifies a handle and it doesn't exist */
+ err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+ handle, GFP_KERNEL);
}
+ if (err < 0)
+ goto errout;
+ fnew->handle = handle;

if (tb[TCA_FLOWER_FLAGS]) {
fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
@@ -957,8 +950,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
*arg = fnew;

if (fold) {
- fnew->handle = handle;
- idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
+ idr_replace(&head->handle_idr, fnew, fnew->handle);
list_replace_rcu(&fold->list, &fnew->list);
tcf_unbind_filter(tp, &fold->res);
tcf_exts_get_net(&fold->exts);
@@ -972,7 +964,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,

errout_idr:
if (fnew->handle)
- idr_remove_ext(&head->handle_idr, fnew->handle);
+ idr_remove(&head->handle_idr, fnew->handle);
errout:
tcf_exts_destroy(&fnew->exts);
kfree(fnew);
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index ac152b4f4247..9260f7d14ab9 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -316,19 +316,16 @@ static void *u32_get(struct tcf_proto *tp, u32 handle)
return u32_lookup_key(ht, handle);
}

+/*
+ * This is only used inside rtnl lock it is safe to increment
+ * without read _copy_ update semantics
+ */
static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
{
- unsigned long idr_index;
- int err;
-
- /* This is only used inside rtnl lock it is safe to increment
- * without read _copy_ update semantics
- */
- err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index,
- 1, 0x7FF, GFP_KERNEL);
- if (err)
+ int id = idr_alloc(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
+ if (id < 0)
return 0;
- return (u32)(idr_index | 0x800) << 20;
+ return ((u32)id | 0x800) << 20;
}

static struct hlist_head *tc_u_common_hash;
@@ -591,7 +588,7 @@ static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
rtnl_dereference(n->next));
tcf_unbind_filter(tp, &n->res);
u32_remove_hw_knode(tp, n->handle);
- idr_remove_ext(&ht->handle_idr, n->handle);
+ idr_remove(&ht->handle_idr, n->handle);
if (tcf_exts_get_net(&n->exts))
call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
else
@@ -617,7 +614,7 @@ static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
if (phn == ht) {
u32_clear_hw_hnode(tp, ht);
idr_destroy(&ht->handle_idr);
- idr_remove_ext(&tp_c->handle_idr, ht->handle);
+ idr_remove(&tp_c->handle_idr, ht->handle);
RCU_INIT_POINTER(*hn, ht->next);
kfree_rcu(ht, rcu);
return 0;
@@ -736,15 +733,15 @@ static int u32_delete(struct tcf_proto *tp, void *arg, bool *last)

static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
{
- unsigned long idr_index;
u32 start = htid | 0x800;
u32 max = htid | 0xFFF;
u32 min = htid;
+ unsigned long idr_index = start;

- if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
- start, max + 1, GFP_KERNEL)) {
- if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index,
- min + 1, max + 1, GFP_KERNEL))
+ if (idr_alloc_ul(&ht->handle_idr, NULL, &idr_index, max, GFP_KERNEL)) {
+ idr_index = min + 1;
+ if (idr_alloc_ul(&ht->handle_idr, NULL, &idr_index, max,
+ GFP_KERNEL))
return max;
}

@@ -833,7 +830,7 @@ static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
if (pins->handle == n->handle)
break;

- idr_replace_ext(&ht->handle_idr, n, n->handle);
+ idr_replace(&ht->handle_idr, n, n->handle);
RCU_INIT_POINTER(n->next, pins->next);
rcu_assign_pointer(*ins, n);
}
@@ -976,8 +973,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
return -ENOMEM;
}
} else {
- err = idr_alloc_ext(&tp_c->handle_idr, ht, NULL,
- handle, handle + 1, GFP_KERNEL);
+ err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
+ handle, GFP_KERNEL);
if (err) {
kfree(ht);
return err;
@@ -992,7 +989,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,

err = u32_replace_hw_hnode(tp, ht, flags);
if (err) {
- idr_remove_ext(&tp_c->handle_idr, handle);
+ idr_remove(&tp_c->handle_idr, handle);
kfree(ht);
return err;
}
@@ -1026,8 +1023,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
return -EINVAL;
handle = htid | TC_U32_NODE(handle);
- err = idr_alloc_ext(&ht->handle_idr, NULL, NULL,
- handle, handle + 1,
+ err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
GFP_KERNEL);
if (err)
return err;
@@ -1120,7 +1116,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
#endif
kfree(n);
erridr:
- idr_remove_ext(&ht->handle_idr, handle);
+ idr_remove(&ht->handle_idr, handle);
return err;
}

--
2.15.0