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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-08 14:39:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-08 14:39:29 -0800
commit9d21874da8ec0e0043c85cde8dda173e74ffc24d (patch)
tree8c02dce2b04ff5d70cafbd82a8bff383f2a49604
parent4ed8244ef8847c8ad7414e1a12ba45fef7998721 (diff)
parentac665d9423474e64e64b34b0e2cea43601b50d7d (diff)
Merge branch 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax
Pull idr updates from Matthew Wilcox: - test-suite improvements - replace the extended API by improving the normal API - performance improvement for IDRs which are 1-based rather than 0-based - add documentation * 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax: idr: Add documentation idr: Make 1-based IDRs more efficient idr: Warn if old iterators see large IDs idr: Rename idr_for_each_entry_ext idr: Remove idr_alloc_ext cls_u32: Convert to idr_alloc_u32 cls_u32: Reinstate cyclic allocation cls_flower: Convert to idr_alloc_u32 cls_bpf: Convert to use idr_alloc_u32 cls_basic: Convert to use idr_alloc_u32 cls_api: Convert to idr_alloc_u32 net sched actions: Convert to use idr_alloc_u32 idr: Add idr_alloc_u32 helper idr: Delete idr_find_ext function idr: Delete idr_replace_ext function idr: Delete idr_remove_ext function IDR test suite: Check handling negative end correctly idr test suite: Fix ida_test_random() radix tree test suite: Remove ARRAY_SIZE
-rw-r--r--Documentation/core-api/idr.rst79
-rw-r--r--Documentation/core-api/index.rst1
-rw-r--r--Documentation/core-api/kernel-api.rst12
-rw-r--r--include/linux/idr.h174
-rw-r--r--include/linux/radix-tree.h17
-rw-r--r--lib/idr.c255
-rw-r--r--lib/radix-tree.c3
-rw-r--r--net/sched/act_api.c72
-rw-r--r--net/sched/cls_api.c8
-rw-r--r--net/sched/cls_basic.c33
-rw-r--r--net/sched/cls_bpf.c30
-rw-r--r--net/sched/cls_flower.c34
-rw-r--r--net/sched/cls_u32.c47
-rw-r--r--tools/testing/radix-tree/idr-test.c29
-rw-r--r--tools/testing/radix-tree/linux/kernel.h2
15 files changed, 471 insertions, 325 deletions
diff --git a/Documentation/core-api/idr.rst b/Documentation/core-api/idr.rst
new file mode 100644
index 000000000000..9078a5c3ac95
--- /dev/null
+++ b/Documentation/core-api/idr.rst
@@ -0,0 +1,79 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+=============
+ID Allocation
+=============
+
+:Author: Matthew Wilcox
+
+Overview
+========
+
+A common problem to solve is allocating identifiers (IDs); generally
+small numbers which identify a thing. Examples include file descriptors,
+process IDs, packet identifiers in networking protocols, SCSI tags
+and device instance numbers. The IDR and the IDA provide a reasonable
+solution to the problem to avoid everybody inventing their own. The IDR
+provides the ability to map an ID to a pointer, while the IDA provides
+only ID allocation, and as a result is much more memory-efficient.
+
+IDR usage
+=========
+
+Start by initialising an IDR, either with :c:func:`DEFINE_IDR`
+for statically allocated IDRs or :c:func:`idr_init` for dynamically
+allocated IDRs.
+
+You can call :c:func:`idr_alloc` to allocate an unused ID. Look up
+the pointer you associated with the ID by calling :c:func:`idr_find`
+and free the ID by calling :c:func:`idr_remove`.
+
+If you need to change the pointer associated with an ID, you can call
+:c:func:`idr_replace`. One common reason to do this is to reserve an
+ID by passing a ``NULL`` pointer to the allocation function; initialise the
+object with the reserved ID and finally insert the initialised object
+into the IDR.
+
+Some users need to allocate IDs larger than ``INT_MAX``. So far all of
+these users have been content with a ``UINT_MAX`` limit, and they use
+:c:func:`idr_alloc_u32`. If you need IDs that will not fit in a u32,
+we will work with you to address your needs.
+
+If you need to allocate IDs sequentially, you can use
+:c:func:`idr_alloc_cyclic`. The IDR becomes less efficient when dealing
+with larger IDs, so using this function comes at a slight cost.
+
+To perform an action on all pointers used by the IDR, you can
+either use the callback-based :c:func:`idr_for_each` or the
+iterator-style :c:func:`idr_for_each_entry`. You may need to use
+:c:func:`idr_for_each_entry_continue` to continue an iteration. You can
+also use :c:func:`idr_get_next` if the iterator doesn't fit your needs.
+
+When you have finished using an IDR, you can call :c:func:`idr_destroy`
+to release the memory used by the IDR. This will not free the objects
+pointed to from the IDR; if you want to do that, use one of the iterators
+to do it.
+
+You can use :c:func:`idr_is_empty` to find out whether there are any
+IDs currently allocated.
+
+If you need to take a lock while allocating a new ID from the IDR,
+you may need to pass a restrictive set of GFP flags, which can lead
+to the IDR being unable to allocate memory. To work around this,
+you can call :c:func:`idr_preload` before taking the lock, and then
+:c:func:`idr_preload_end` after the allocation.
+
+.. kernel-doc:: include/linux/idr.h
+ :doc: idr sync
+
+IDA usage
+=========
+
+.. kernel-doc:: lib/idr.c
+ :doc: IDA description
+
+Functions and structures
+========================
+
+.. kernel-doc:: include/linux/idr.h
+.. kernel-doc:: lib/idr.c
diff --git a/Documentation/core-api/index.rst b/Documentation/core-api/index.rst
index 1b1fd01990b5..c670a8031786 100644
--- a/Documentation/core-api/index.rst
+++ b/Documentation/core-api/index.rst
@@ -16,6 +16,7 @@ Core utilities
atomic_ops
refcount-vs-atomic
cpu_hotplug
+ idr
local_ops
workqueue
genericirq
diff --git a/Documentation/core-api/kernel-api.rst b/Documentation/core-api/kernel-api.rst
index e7fadf02c511..ff335f8aeb39 100644
--- a/Documentation/core-api/kernel-api.rst
+++ b/Documentation/core-api/kernel-api.rst
@@ -103,18 +103,6 @@ CRC Functions
.. kernel-doc:: lib/crc-itu-t.c
:export:
-idr/ida Functions
------------------
-
-.. kernel-doc:: include/linux/idr.h
- :doc: idr sync
-
-.. kernel-doc:: lib/idr.c
- :doc: IDA description
-
-.. kernel-doc:: lib/idr.c
- :export:
-
Math Functions in Linux
=======================
diff --git a/include/linux/idr.h b/include/linux/idr.h
index fa14f834e4ed..7d6a6313f0ab 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -15,10 +15,10 @@
#include <linux/radix-tree.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
-#include <linux/bug.h>
struct idr {
struct radix_tree_root idr_rt;
+ unsigned int idr_base;
unsigned int idr_next;
};
@@ -31,10 +31,26 @@ struct idr {
/* Set the IDR flag and the IDR_FREE tag */
#define IDR_RT_MARKER ((__force gfp_t)(3 << __GFP_BITS_SHIFT))
-#define IDR_INIT \
-{ \
- .idr_rt = RADIX_TREE_INIT(IDR_RT_MARKER) \
+#define IDR_INIT_BASE(base) { \
+ .idr_rt = RADIX_TREE_INIT(IDR_RT_MARKER), \
+ .idr_base = (base), \
+ .idr_next = 0, \
}
+
+/**
+ * IDR_INIT() - Initialise an IDR.
+ *
+ * A freshly-initialised IDR contains no IDs.
+ */
+#define IDR_INIT IDR_INIT_BASE(0)
+
+/**
+ * DEFINE_IDR() - Define a statically-allocated IDR
+ * @name: Name of IDR
+ *
+ * An IDR defined using this macro is ready for use with no additional
+ * initialisation required. It contains no IDs.
+ */
#define DEFINE_IDR(name) struct idr name = IDR_INIT
/**
@@ -82,80 +98,52 @@ static inline void idr_set_cursor(struct idr *idr, unsigned int val)
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_cyclic(struct idr *, void *entry, int start, int end, gfp_t);
+int idr_alloc(struct idr *, void *ptr, int start, int end, gfp_t);
+int __must_check idr_alloc_u32(struct idr *, void *ptr, u32 *id,
+ unsigned long max, gfp_t);
+int idr_alloc_cyclic(struct idr *, void *ptr, int start, int end, gfp_t);
+void *idr_remove(struct idr *, unsigned long id);
+void *idr_find(const struct idr *, unsigned long id);
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)
-{
- return radix_tree_delete_item(&idr->idr_rt, id, NULL);
-}
-
-static inline void *idr_remove(struct idr *idr, int id)
+/**
+ * idr_init_base() - Initialise an IDR.
+ * @idr: IDR handle.
+ * @base: The base value for the IDR.
+ *
+ * This variation of idr_init() creates an IDR which will allocate IDs
+ * starting at %base.
+ */
+static inline void idr_init_base(struct idr *idr, int base)
{
- return idr_remove_ext(idr, id);
+ INIT_RADIX_TREE(&idr->idr_rt, IDR_RT_MARKER);
+ idr->idr_base = base;
+ idr->idr_next = 0;
}
+/**
+ * idr_init() - Initialise an IDR.
+ * @idr: IDR handle.
+ *
+ * Initialise a dynamically allocated IDR. To initialise a
+ * statically allocated IDR, use DEFINE_IDR().
+ */
static inline void idr_init(struct idr *idr)
{
- INIT_RADIX_TREE(&idr->idr_rt, IDR_RT_MARKER);
- idr->idr_next = 0;
+ idr_init_base(idr, 0);
}
+/**
+ * idr_is_empty() - Are there any IDs allocated?
+ * @idr: IDR handle.
+ *
+ * Return: %true if any IDs have been allocated from this IDR.
+ */
static inline bool idr_is_empty(const struct idr *idr)
{
return radix_tree_empty(&idr->idr_rt) &&
@@ -174,50 +162,38 @@ static inline void idr_preload_end(void)
}
/**
- * idr_find - return pointer for given id
- * @idr: idr handle
- * @id: lookup key
- *
- * Return the pointer given the id it has been registered with. A %NULL
- * return indicates that @id is not valid or you passed %NULL in
- * idr_get_new().
+ * idr_for_each_entry() - Iterate over an IDR's elements of a given type.
+ * @idr: IDR handle.
+ * @entry: The type * to use as cursor
+ * @id: Entry ID.
*
- * This function can be called under rcu_read_lock(), given that the leaf
- * pointers lifetimes are correctly managed.
+ * @entry and @id do not need to be initialized before the loop, and
+ * after normal termination @entry is left with the value NULL. This
+ * is convenient for a "not found" value.
*/
-static inline void *idr_find_ext(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);
-}
+#define idr_for_each_entry(idr, entry, id) \
+ for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; ++id)
/**
- * idr_for_each_entry - iterate over an idr's elements of a given type
- * @idr: idr handle
- * @entry: the type * to use as cursor
- * @id: id entry's key
+ * idr_for_each_entry_ul() - Iterate over an IDR's elements of a given type.
+ * @idr: IDR handle.
+ * @entry: The type * to use as cursor.
+ * @id: Entry ID.
*
* @entry and @id do not need to be initialized before the loop, and
- * after normal terminatinon @entry is left with the value NULL. This
+ * after normal termination @entry is left with the value NULL. This
* is convenient for a "not found" value.
*/
-#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
- * @idr: idr handle
- * @entry: the type * to use as cursor
- * @id: id entry's key
+ * idr_for_each_entry_continue() - Continue iteration over an IDR's elements of a given type
+ * @idr: IDR handle.
+ * @entry: The type * to use as a cursor.
+ * @id: Entry ID.
*
- * Continue to iterate over list of given type, continuing after
- * the current position.
+ * Continue to iterate over entries, continuing after the current position.
*/
#define idr_for_each_entry_continue(idr, entry, id) \
for ((entry) = idr_get_next((idr), &(id)); \
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 2593ce513a18..c98d77fcf393 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -1,4 +1,5 @@
#include <linux/bitmap.h>
+#include <linux/bug.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/slab.h>
@@ -7,71 +8,184 @@
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_u32() - Allocate an ID.
+ * @idr: IDR handle.
+ * @ptr: Pointer to be associated with the new ID.
+ * @nextid: Pointer to an ID.
+ * @max: The maximum ID to allocate (inclusive).
+ * @gfp: Memory allocation flags.
+ *
+ * Allocates an unused ID in the range specified by @nextid and @max.
+ * Note that @max is inclusive whereas the @end parameter to idr_alloc()
+ * is exclusive. The new ID is assigned to @nextid before the pointer
+ * is inserted into the IDR, so if @nextid points into the object pointed
+ * to by @ptr, a concurrent lookup will not find an uninitialised ID.
+ *
+ * The caller should provide their own locking to ensure that two
+ * concurrent modifications to the IDR are not possible. Read-only
+ * accesses to the IDR may be done under the RCU read lock or may
+ * exclude simultaneous writers.
+ *
+ * Return: 0 if an ID was allocated, -ENOMEM if memory allocation failed,
+ * or -ENOSPC if no free IDs could be found. If an error occurred,
+ * @nextid is unchanged.
+ */
+int idr_alloc_u32(struct idr *idr, void *ptr, u32 *nextid,
+ unsigned long max, gfp_t gfp)
{
struct radix_tree_iter iter;
void __rcu **slot;
+ int base = idr->idr_base;
+ int id = *nextid;
if (WARN_ON_ONCE(radix_tree_is_internal_node(ptr)))
return -EINVAL;
+ 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);
+ id = (id < base) ? 0 : id - base;
+ radix_tree_iter_init(&iter, id);
+ slot = idr_get_free(&idr->idr_rt, &iter, gfp, max - base);
if (IS_ERR(slot))
return PTR_ERR(slot);
+ *nextid = iter.index + base;
+ /* there is a memory barrier inside radix_tree_iter_replace() */
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;
return 0;
}
-EXPORT_SYMBOL_GPL(idr_alloc_cmn);
+EXPORT_SYMBOL_GPL(idr_alloc_u32);
/**
- * idr_alloc_cyclic - allocate new idr entry in a cyclical fashion
- * @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 ID larger than the last ID allocated if one is available.
- * If not, it will attempt to allocate the smallest ID that is larger or
- * equal to @start.
+ * 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 specified by @start and @end. If
+ * @end is <= 0, it is treated as one larger than %INT_MAX. This allows
+ * callers to use @start + N as @end as long as N is within integer range.
+ *
+ * The caller should provide their own locking to ensure that two
+ * concurrent modifications to the IDR are not possible. Read-only
+ * accesses to the IDR may be done under the RCU read lock or may
+ * exclude simultaneous writers.
+ *
+ * Return: The newly allocated ID, -ENOMEM if memory allocation failed,
+ * or -ENOSPC if no free IDs could be found.
*/
-int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
+int idr_alloc(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
{
- int id, curr = idr->idr_next;
+ u32 id = start;
+ int ret;
+
+ if (WARN_ON_ONCE(start < 0))
+ return -EINVAL;
+
+ ret = idr_alloc_u32(idr, ptr, &id, end > 0 ? end - 1 : INT_MAX, gfp);
+ if (ret)
+ return ret;
+
+ return id;
+}
+EXPORT_SYMBOL_GPL(idr_alloc);
- if (curr < start)
- curr = start;
+/**
+ * idr_alloc_cyclic() - Allocate an ID cyclically.
+ * @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 specified by @nextid and @end. If
+ * @end is <= 0, it is treated as one larger than %INT_MAX. This allows
+ * callers to use @start + N as @end as long as N is within integer range.
+ * The search for an unused ID will start at the last ID allocated and will
+ * wrap around to @start if no free IDs are found before reaching @end.
+ *
+ * The caller should provide their own locking to ensure that two
+ * concurrent modifications to the IDR are not possible. Read-only
+ * accesses to the IDR may be done under the RCU read lock or may
+ * exclude simultaneous writers.
+ *
+ * Return: The newly allocated ID, -ENOMEM if memory allocation failed,
+ * or -ENOSPC if no free IDs could be found.
+ */
+int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
+{
+ u32 id = idr->idr_next;
+ int err, max = end > 0 ? end - 1 : INT_MAX;
- id = idr_alloc(idr, ptr, curr, end, gfp);
- if ((id == -ENOSPC) && (curr > start))
- id = idr_alloc(idr, ptr, start, curr, gfp);
+ if ((int)id < start)
+ id = start;
- if (id >= 0)
- idr->idr_next = id + 1U;
+ err = idr_alloc_u32(idr, ptr, &id, max, gfp);
+ if ((err == -ENOSPC) && (id > start)) {
+ id = start;
+ err = idr_alloc_u32(idr, ptr, &id, max, gfp);
+ }
+ if (err)
+ return err;
+ idr->idr_next = id + 1;
return id;
}
EXPORT_SYMBOL(idr_alloc_cyclic);
/**
- * idr_for_each - iterate through all stored pointers
- * @idr: idr handle
- * @fn: function to be called for each pointer
- * @data: data passed to callback function
+ * idr_remove() - Remove an ID from the IDR.
+ * @idr: IDR handle.
+ * @id: Pointer ID.
+ *
+ * Removes this ID from the IDR. If the ID was not previously in the IDR,
+ * this function returns %NULL.
+ *
+ * Since this function modifies the IDR, the caller should provide their
+ * own locking to ensure that concurrent modification of the same IDR is
+ * not possible.
+ *
+ * Return: The pointer formerly associated with this ID.
+ */
+void *idr_remove(struct idr *idr, unsigned long id)
+{
+ return radix_tree_delete_item(&idr->idr_rt, id - idr->idr_base, NULL);
+}
+EXPORT_SYMBOL_GPL(idr_remove);
+
+/**
+ * idr_find() - Return pointer for given ID.
+ * @idr: IDR handle.
+ * @id: Pointer ID.
+ *
+ * Looks up the pointer associated with this ID. A %NULL pointer may
+ * indicate that @id is not allocated or that the %NULL pointer was
+ * associated with this ID.
+ *
+ * This function can be called under rcu_read_lock(), given that the leaf
+ * pointers lifetimes are correctly managed.
+ *
+ * Return: The pointer associated with this ID.
+ */
+void *idr_find(const struct idr *idr, unsigned long id)
+{
+ return radix_tree_lookup(&idr->idr_rt, id - idr->idr_base);
+}
+EXPORT_SYMBOL_GPL(idr_find);
+
+/**
+ * idr_for_each() - Iterate through all stored pointers.
+ * @idr: IDR handle.
+ * @fn: Function to be called for each pointer.
+ * @data: Data passed to callback function.
*
* The callback function will be called for each entry in @idr, passing
- * the id, the pointer and the data pointer passed to this function.
+ * the ID, the entry and @data.
*
* If @fn returns anything other than %0, the iteration stops and that
* value is returned from this function.
@@ -86,9 +200,14 @@ int idr_for_each(const struct idr *idr,
{
struct radix_tree_iter iter;
void __rcu **slot;
+ int base = idr->idr_base;
radix_tree_for_each_slot(slot, &idr->idr_rt, &iter, 0) {
- int ret = fn(iter.index, rcu_dereference_raw(*slot), data);
+ int ret;
+
+ if (WARN_ON_ONCE(iter.index > INT_MAX))
+ break;
+ ret = fn(iter.index + base, rcu_dereference_raw(*slot), data);
if (ret)
return ret;
}
@@ -98,9 +217,9 @@ int idr_for_each(const struct idr *idr,
EXPORT_SYMBOL(idr_for_each);
/**
- * idr_get_next - Find next populated entry
- * @idr: idr handle
- * @nextid: Pointer to lowest possible ID to return
+ * idr_get_next() - Find next populated entry.
+ * @idr: IDR handle.
+ * @nextid: Pointer to an ID.
*
* 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
@@ -111,35 +230,55 @@ void *idr_get_next(struct idr *idr, int *nextid)
{
struct radix_tree_iter iter;
void __rcu **slot;
+ int base = idr->idr_base;
+ int id = *nextid;
- slot = radix_tree_iter_find(&idr->idr_rt, &iter, *nextid);
+ id = (id < base) ? 0 : id - base;
+ slot = radix_tree_iter_find(&idr->idr_rt, &iter, id);
if (!slot)
return NULL;
+ id = iter.index + base;
+
+ if (WARN_ON_ONCE(id > INT_MAX))
+ return NULL;
- *nextid = iter.index;
+ *nextid = id;
return rcu_dereference_raw(*slot);
}
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 an ID.
+ *
+ * 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;
+ unsigned long base = idr->idr_base;
+ unsigned long id = *nextid;
- slot = radix_tree_iter_find(&idr->idr_rt, &iter, *nextid);
+ id = (id < base) ? 0 : id - base;
+ slot = radix_tree_iter_find(&idr->idr_rt, &iter, id);
if (!slot)
return NULL;
- *nextid = iter.index;
+ *nextid = iter.index + base;
return rcu_dereference_raw(*slot);
}
-EXPORT_SYMBOL(idr_get_next_ext);
+EXPORT_SYMBOL(idr_get_next_ul);
/**
- * idr_replace - replace pointer for given id
- * @idr: idr handle
- * @ptr: New pointer to associate with the ID
- * @id: Lookup key
+ * idr_replace() - replace pointer for given ID.
+ * @idr: IDR handle.
+ * @ptr: New pointer to associate with the ID.
+ * @id: ID to change.
*
* Replace the pointer registered with an ID and return the old value.
* This function can be called under the RCU read lock concurrently with
@@ -147,18 +286,9 @@ EXPORT_SYMBOL(idr_get_next_ext);
* the one being replaced!).
*
* Returns: the old value on success. %-ENOENT indicates that @id was not
- * found. %-EINVAL indicates that @id or @ptr were not valid.
+ * found. %-EINVAL indicates that @ptr was 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;
@@ -166,6 +296,7 @@ void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id)
if (WARN_ON_ONCE(radix_tree_is_internal_node(ptr)))
return ERR_PTR(-EINVAL);
+ id -= idr->idr_base;
entry = __radix_tree_lookup(&idr->idr_rt, id, &node, &slot);
if (!slot || radix_tree_tag_get(&idr->idr_rt, id, IDR_FREE))
@@ -175,7 +306,7 @@ 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
@@ -235,7 +366,7 @@ 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 c8d55565fafa..0a7ae3288a24 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -24,6 +24,7 @@
#include <linux/bitmap.h>
#include <linux/bitops.h>
+#include <linux/bug.h>
#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/export.h>
@@ -2135,7 +2136,7 @@ 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 52622a3d2517..eba6682727dd 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);
@@ -222,7 +222,7 @@ static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
struct tc_action *p = NULL;
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 +283,28 @@ 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);
+ idr_preload(GFP_KERNEL);
+ spin_lock_bh(&idrinfo->lock);
/* user doesn't specify an index */
if (!index) {
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&idrinfo->lock);
- err = idr_alloc_ext(idr, NULL, &idr_index, 1, 0,
- 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;
+ index = 1;
+ err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
} else {
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&idrinfo->lock);
- err = idr_alloc_ext(idr, NULL, NULL, index, index + 1,
- GFP_ATOMIC);
- spin_unlock_bh(&idrinfo->lock);
- idr_preload_end();
- if (err)
- goto err3;
- p->tcfa_index = index;
+ 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_tm.install = jiffies;
p->tcfa_tm.lastuse = jiffies;
p->tcfa_tm.firstuse = 0;
@@ -330,9 +312,8 @@ err3:
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 +321,15 @@ err3:
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 +338,7 @@ 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 +351,7 @@ 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_api.c b/net/sched/cls_api.c
index bcb4ccb5f894..2bc1bc23d42e 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -381,8 +381,8 @@ static int tcf_block_insert(struct tcf_block *block, struct net *net,
struct tcf_net *tn = net_generic(net, tcf_net_id);
int err;
- err = idr_alloc_ext(&tn->idr, block, NULL, block_index,
- block_index + 1, GFP_KERNEL);
+ err = idr_alloc_u32(&tn->idr, block, &block_index, block_index,
+ GFP_KERNEL);
if (err)
return err;
block->index = block_index;
@@ -393,7 +393,7 @@ static void tcf_block_remove(struct tcf_block *block, struct net *net)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
- idr_remove_ext(&tn->idr, block->index);
+ idr_remove(&tn->idr, block->index);
}
static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
@@ -434,7 +434,7 @@ static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
- return idr_find_ext(&tn->idr, block_index);
+ return idr_find(&tn->idr, block_index);
}
static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block)
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index d333f5c5101d..6b7ab3512f5b 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, struct netlink_ext_ack *extack)
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
@@ -138,7 +138,7 @@ 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);
@@ -185,7 +185,6 @@ 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;
@@ -208,34 +207,30 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
if (err < 0)
goto errout;
- if (handle) {
- fnew->handle = handle;
- if (!fold) {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- handle, handle + 1, GFP_KERNEL);
- if (err)
- goto errout;
- }
- } else {
- err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
- 1, 0x7FFFFFFF, GFP_KERNEL);
- if (err)
- goto errout;
- fnew->handle = idr_index;
+ if (!handle) {
+ handle = 1;
+ err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+ INT_MAX, GFP_KERNEL);
+ } else if (!fold) {
+ err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+ handle, GFP_KERNEL);
}
+ if (err)
+ goto errout;
+ fnew->handle = handle;
err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr,
extack);
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 8e5326bc6440..b07c1fa8bc0d 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -295,7 +295,7 @@ 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, extack);
list_del_rcu(&prog->link);
tcf_unbind_filter(tp, &prog->res);
@@ -471,7 +471,6 @@ 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)
@@ -498,21 +497,18 @@ 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)
- goto errout;
- prog->handle = idr_index;
- } else {
- if (!oldprog) {
- ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index,
- handle, handle + 1, GFP_KERNEL);
- if (ret)
- goto errout;
- }
- prog->handle = handle;
+ handle = 1;
+ ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
+ INT_MAX, GFP_KERNEL);
+ } else if (!oldprog) {
+ ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
+ handle, GFP_KERNEL);
}
+ if (ret)
+ goto errout;
+ prog->handle = handle;
+
ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr,
extack);
if (ret < 0)
@@ -526,7 +522,7 @@ 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);
@@ -542,7 +538,7 @@ errout_parms:
cls_bpf_free_parms(prog);
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 dc9acaafc0a8..7d0ce2c40f93 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -288,7 +288,7 @@ 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, extack);
@@ -334,7 +334,7 @@ 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] = {
@@ -865,7 +865,6 @@ 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])
@@ -896,21 +895,17 @@ 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;
+ handle = 1;
+ err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+ INT_MAX, 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)
+ goto errout;
+ fnew->handle = handle;
if (tb[TCA_FLOWER_FLAGS]) {
fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
@@ -966,8 +961,7 @@ 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);
@@ -981,7 +975,7 @@ 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 6311a548046b..c07e8abc3d52 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -316,19 +316,13 @@ static void *u32_get(struct tcf_proto *tp, u32 handle)
return u32_lookup_key(ht, handle);
}
+/* Protected by rtnl lock */
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_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
+ if (id < 0)
return 0;
- return (u32)(idr_index | 0x800) << 20;
+ return (id | 0x800U) << 20;
}
static struct hlist_head *tc_u_common_hash;
@@ -598,7 +592,7 @@ 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, extack);
- 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
@@ -625,7 +619,7 @@ static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
if (phn == ht) {
u32_clear_hw_hnode(tp, ht, extack);
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;
@@ -747,19 +741,17 @@ ret:
static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
{
- unsigned long idr_index;
- u32 start = htid | 0x800;
+ u32 index = htid | 0x800;
u32 max = htid | 0xFFF;
- u32 min = htid;
- 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))
- return max;
+ if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
+ index = htid + 1;
+ if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
+ GFP_KERNEL))
+ index = max;
}
- return (u32)idr_index;
+ return index;
}
static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
@@ -849,7 +841,7 @@ 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);
}
@@ -1010,8 +1002,8 @@ 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;
@@ -1027,7 +1019,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
err = u32_replace_hw_hnode(tp, ht, flags, extack);
if (err) {
- idr_remove_ext(&tp_c->handle_idr, handle);
+ idr_remove(&tp_c->handle_idr, handle);
kfree(ht);
return err;
}
@@ -1067,8 +1059,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
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;
@@ -1163,7 +1154,7 @@ errfree:
#endif
kfree(n);
erridr:
- idr_remove_ext(&ht->handle_idr, handle);
+ idr_remove(&ht->handle_idr, handle);
return err;
}
diff --git a/tools/testing/radix-tree/idr-test.c b/tools/testing/radix-tree/idr-test.c
index 30cd0b296f1a..44ef9eba5a7a 100644
--- a/tools/testing/radix-tree/idr-test.c
+++ b/tools/testing/radix-tree/idr-test.c
@@ -153,11 +153,12 @@ void idr_nowait_test(void)
idr_destroy(&idr);
}
-void idr_get_next_test(void)
+void idr_get_next_test(int base)
{
unsigned long i;
int nextid;
DEFINE_IDR(idr);
+ idr_init_base(&idr, base);
int indices[] = {4, 7, 9, 15, 65, 128, 1000, 99999, 0};
@@ -207,6 +208,7 @@ void idr_checks(void)
assert(idr_alloc(&idr, item, i, i + 10, GFP_KERNEL) == i);
}
assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i, GFP_KERNEL) == -ENOSPC);
+ assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i + 10, GFP_KERNEL) == -ENOSPC);
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
@@ -214,6 +216,23 @@ void idr_checks(void)
assert(idr_is_empty(&idr));
+ idr_set_cursor(&idr, INT_MAX - 3UL);
+ for (i = INT_MAX - 3UL; i < INT_MAX + 3UL; i++) {
+ struct item *item;
+ unsigned int id;
+ if (i <= INT_MAX)
+ item = item_create(i, 0);
+ else
+ item = item_create(i - INT_MAX - 1, 0);
+
+ id = idr_alloc_cyclic(&idr, item, 0, 0, GFP_KERNEL);
+ assert(id == item->index);
+ }
+
+ idr_for_each(&idr, item_idr_free, &idr);
+ idr_destroy(&idr);
+ assert(idr_is_empty(&idr));
+
for (i = 1; i < 10000; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, 1, 20000, GFP_KERNEL) == i);
@@ -226,7 +245,9 @@ void idr_checks(void)
idr_alloc_test();
idr_null_test();
idr_nowait_test();
- idr_get_next_test();
+ idr_get_next_test(0);
+ idr_get_next_test(1);
+ idr_get_next_test(4);
}
/*
@@ -380,7 +401,7 @@ void ida_check_random(void)
do {
ida_pre_get(&ida, GFP_KERNEL);
err = ida_get_new_above(&ida, bit, &id);
- } while (err == -ENOMEM);
+ } while (err == -EAGAIN);
assert(!err);
assert(id == bit);
}
@@ -489,7 +510,7 @@ static void *ida_random_fn(void *arg)
void ida_thread_tests(void)
{
- pthread_t threads[10];
+ pthread_t threads[20];
int i;
for (i = 0; i < ARRAY_SIZE(threads); i++)
diff --git a/tools/testing/radix-tree/linux/kernel.h b/tools/testing/radix-tree/linux/kernel.h
index c3bc3f364f68..426f32f28547 100644
--- a/tools/testing/radix-tree/linux/kernel.h
+++ b/tools/testing/radix-tree/linux/kernel.h
@@ -17,6 +17,4 @@
#define pr_debug printk
#define pr_cont printk
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
#endif /* _KERNEL_H */

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