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Date: Wed, 14 Nov 2018 08:22:28 +0000
From: Ido Schimmel <idosch@...lanox.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "davem@...emloft.net" <davem@...emloft.net>,
Jiri Pirko <jiri@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 03/11] lib: introduce initial implementation of
object aggregation manager
From: Jiri Pirko <jiri@...lanox.com>
This lib tracks objects which could be of two types:
1) root object
2) nested object - with a "delta" which differentiates it from
the associated root object
The objects are tracked by a hashtable and reference-counted. User is
responsible of implementing callbacks to create/destroy root entity
related to each root object and callback to create/destroy nested object
delta.
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
MAINTAINERS | 8 +
include/linux/objagg.h | 46 ++
include/trace/events/objagg.h | 228 ++++++++++
lib/Kconfig | 3 +
lib/Kconfig.debug | 10 +
lib/Makefile | 2 +
lib/objagg.c | 501 ++++++++++++++++++++
lib/test_objagg.c | 835 ++++++++++++++++++++++++++++++++++
8 files changed, 1633 insertions(+)
create mode 100644 include/linux/objagg.h
create mode 100644 include/trace/events/objagg.h
create mode 100644 lib/objagg.c
create mode 100644 lib/test_objagg.c
diff --git a/MAINTAINERS b/MAINTAINERS
index e110e327bf38..3bd775ba51ce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10679,6 +10679,14 @@ L: linux-nfc@...ts.01.org (moderated for non-subscribers)
S: Supported
F: drivers/nfc/nxp-nci
+OBJAGG
+M: Jiri Pirko <jiri@...lanox.com>
+L: netdev@...r.kernel.org
+S: Supported
+F: lib/objagg.c
+F: lib/test_objagg.c
+F: include/linux/objagg.h
+
OBJTOOL
M: Josh Poimboeuf <jpoimboe@...hat.com>
M: Peter Zijlstra <peterz@...radead.org>
diff --git a/include/linux/objagg.h b/include/linux/objagg.h
new file mode 100644
index 000000000000..34f38c186ea0
--- /dev/null
+++ b/include/linux/objagg.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
+
+#ifndef _OBJAGG_H
+#define _OBJAGG_H
+
+struct objagg_ops {
+ size_t obj_size;
+ void * (*delta_create)(void *priv, void *parent_obj, void *obj);
+ void (*delta_destroy)(void *priv, void *delta_priv);
+ void * (*root_create)(void *priv, void *obj);
+ void (*root_destroy)(void *priv, void *root_priv);
+};
+
+struct objagg;
+struct objagg_obj;
+
+const void *objagg_obj_root_priv(const struct objagg_obj *objagg_obj);
+const void *objagg_obj_delta_priv(const struct objagg_obj *objagg_obj);
+const void *objagg_obj_raw(const struct objagg_obj *objagg_obj);
+
+struct objagg_obj *objagg_obj_get(struct objagg *objagg, void *obj);
+void objagg_obj_put(struct objagg *objagg, struct objagg_obj *objagg_obj);
+struct objagg *objagg_create(const struct objagg_ops *ops, void *priv);
+void objagg_destroy(struct objagg *objagg);
+
+struct objagg_obj_stats {
+ unsigned int user_count;
+ unsigned int delta_user_count; /* includes delta object users */
+};
+
+struct objagg_obj_stats_info {
+ struct objagg_obj_stats stats;
+ struct objagg_obj *objagg_obj; /* associated object */
+ bool is_root;
+};
+
+struct objagg_stats {
+ unsigned int stats_info_count;
+ struct objagg_obj_stats_info stats_info[];
+};
+
+const struct objagg_stats *objagg_stats_get(struct objagg *objagg);
+void objagg_stats_put(const struct objagg_stats *objagg_stats);
+
+#endif
diff --git a/include/trace/events/objagg.h b/include/trace/events/objagg.h
new file mode 100644
index 000000000000..fcec0fc9eb0c
--- /dev/null
+++ b/include/trace/events/objagg.h
@@ -0,0 +1,228 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM objagg
+
+#if !defined(__TRACE_OBJAGG_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __TRACE_OBJAGG_H
+
+#include <linux/tracepoint.h>
+
+struct objagg;
+struct objagg_obj;
+
+TRACE_EVENT(objagg_create,
+ TP_PROTO(const struct objagg *objagg),
+
+ TP_ARGS(objagg),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ ),
+
+ TP_printk("objagg %p", __entry->objagg)
+);
+
+TRACE_EVENT(objagg_destroy,
+ TP_PROTO(const struct objagg *objagg),
+
+ TP_ARGS(objagg),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ ),
+
+ TP_printk("objagg %p", __entry->objagg)
+);
+
+TRACE_EVENT(objagg_obj_create,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj),
+
+ TP_ARGS(objagg, obj),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ ),
+
+ TP_printk("objagg %p, obj %p", __entry->objagg, __entry->obj)
+);
+
+TRACE_EVENT(objagg_obj_destroy,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj),
+
+ TP_ARGS(objagg, obj),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ ),
+
+ TP_printk("objagg %p, obj %p", __entry->objagg, __entry->obj)
+);
+
+TRACE_EVENT(objagg_obj_get,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj,
+ unsigned int refcount),
+
+ TP_ARGS(objagg, obj, refcount),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ __field(unsigned int, refcount)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ __entry->refcount = refcount;
+ ),
+
+ TP_printk("objagg %p, obj %p, refcount %u",
+ __entry->objagg, __entry->obj, __entry->refcount)
+);
+
+TRACE_EVENT(objagg_obj_put,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj,
+ unsigned int refcount),
+
+ TP_ARGS(objagg, obj, refcount),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ __field(unsigned int, refcount)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ __entry->refcount = refcount;
+ ),
+
+ TP_printk("objagg %p, obj %p, refcount %u",
+ __entry->objagg, __entry->obj, __entry->refcount)
+);
+
+TRACE_EVENT(objagg_obj_parent_assign,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj,
+ const struct objagg_obj *parent,
+ unsigned int parent_refcount),
+
+ TP_ARGS(objagg, obj, parent, parent_refcount),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ __field(const void *, parent)
+ __field(unsigned int, parent_refcount)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ __entry->parent = parent;
+ __entry->parent_refcount = parent_refcount;
+ ),
+
+ TP_printk("objagg %p, obj %p, parent %p, parent_refcount %u",
+ __entry->objagg, __entry->obj,
+ __entry->parent, __entry->parent_refcount)
+);
+
+TRACE_EVENT(objagg_obj_parent_unassign,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj,
+ const struct objagg_obj *parent,
+ unsigned int parent_refcount),
+
+ TP_ARGS(objagg, obj, parent, parent_refcount),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ __field(const void *, parent)
+ __field(unsigned int, parent_refcount)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ __entry->parent = parent;
+ __entry->parent_refcount = parent_refcount;
+ ),
+
+ TP_printk("objagg %p, obj %p, parent %p, parent_refcount %u",
+ __entry->objagg, __entry->obj,
+ __entry->parent, __entry->parent_refcount)
+);
+
+TRACE_EVENT(objagg_obj_root_create,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj),
+
+ TP_ARGS(objagg, obj),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ ),
+
+ TP_printk("objagg %p, obj %p",
+ __entry->objagg, __entry->obj)
+);
+
+TRACE_EVENT(objagg_obj_root_destroy,
+ TP_PROTO(const struct objagg *objagg,
+ const struct objagg_obj *obj),
+
+ TP_ARGS(objagg, obj),
+
+ TP_STRUCT__entry(
+ __field(const void *, objagg)
+ __field(const void *, obj)
+ ),
+
+ TP_fast_assign(
+ __entry->objagg = objagg;
+ __entry->obj = obj;
+ ),
+
+ TP_printk("objagg %p, obj %p",
+ __entry->objagg, __entry->obj)
+);
+
+#endif /* __TRACE_OBJAGG_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/lib/Kconfig b/lib/Kconfig
index a9965f4af4dd..7dbbcfe9cd90 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -624,3 +624,6 @@ config GENERIC_LIB_CMPDI2
config GENERIC_LIB_UCMPDI2
bool
+
+config OBJAGG
+ tristate "objagg" if COMPILE_TEST
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1af29b8224fd..b3c91b9e32f8 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1976,6 +1976,16 @@ config TEST_MEMCAT_P
If unsure, say N.
+config TEST_OBJAGG
+ tristate "Perform selftest on object aggreration manager"
+ default n
+ depends on OBJAGG
+ help
+ Enable this option to test object aggregation manager on boot
+ (or module load).
+
+ If unsure, say N.
+
endif # RUNTIME_TESTING_MENU
config MEMTEST
diff --git a/lib/Makefile b/lib/Makefile
index db06d1237898..f5262d30bfe6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_TEST_PARMAN) += test_parman.o
obj-$(CONFIG_TEST_KMOD) += test_kmod.o
obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o
+obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
@@ -274,3 +275,4 @@ obj-$(CONFIG_GENERIC_LIB_LSHRDI3) += lshrdi3.o
obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
+obj-$(CONFIG_OBJAGG) += objagg.o
diff --git a/lib/objagg.c b/lib/objagg.c
new file mode 100644
index 000000000000..c9b457a91153
--- /dev/null
+++ b/lib/objagg.c
@@ -0,0 +1,501 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/rhashtable.h>
+#include <linux/list.h>
+#include <linux/sort.h>
+#include <linux/objagg.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/objagg.h>
+
+struct objagg {
+ const struct objagg_ops *ops;
+ void *priv;
+ struct rhashtable obj_ht;
+ struct rhashtable_params ht_params;
+ struct list_head obj_list;
+ unsigned int obj_count;
+};
+
+struct objagg_obj {
+ struct rhash_head ht_node; /* member of objagg->obj_ht */
+ struct list_head list; /* member of objagg->obj_list */
+ struct objagg_obj *parent; /* if the object is nested, this
+ * holds pointer to parent, otherwise NULL
+ */
+ union {
+ void *delta_priv; /* user delta private */
+ void *root_priv; /* user root private */
+ };
+ unsigned int refcount; /* counts number of users of this object
+ * including nested objects
+ */
+ struct objagg_obj_stats stats;
+ unsigned long obj[0];
+};
+
+static unsigned int objagg_obj_ref_inc(struct objagg_obj *objagg_obj)
+{
+ return ++objagg_obj->refcount;
+}
+
+static unsigned int objagg_obj_ref_dec(struct objagg_obj *objagg_obj)
+{
+ return --objagg_obj->refcount;
+}
+
+static void objagg_obj_stats_inc(struct objagg_obj *objagg_obj)
+{
+ objagg_obj->stats.user_count++;
+ objagg_obj->stats.delta_user_count++;
+ if (objagg_obj->parent)
+ objagg_obj->parent->stats.delta_user_count++;
+}
+
+static void objagg_obj_stats_dec(struct objagg_obj *objagg_obj)
+{
+ objagg_obj->stats.user_count--;
+ objagg_obj->stats.delta_user_count--;
+ if (objagg_obj->parent)
+ objagg_obj->parent->stats.delta_user_count--;
+}
+
+static bool objagg_obj_is_root(const struct objagg_obj *objagg_obj)
+{
+ /* Nesting is not supported, so we can use ->parent
+ * to figure out if the object is root.
+ */
+ return !objagg_obj->parent;
+}
+
+/**
+ * objagg_obj_root_priv - obtains root private for an object
+ * @objagg_obj: objagg object instance
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * Either the object is root itself when the private is returned
+ * directly, or the parent is root and its private is returned
+ * instead.
+ *
+ * Returns a user private root pointer.
+ */
+const void *objagg_obj_root_priv(const struct objagg_obj *objagg_obj)
+{
+ if (objagg_obj_is_root(objagg_obj))
+ return objagg_obj->root_priv;
+ WARN_ON(!objagg_obj_is_root(objagg_obj->parent));
+ return objagg_obj->parent->root_priv;
+}
+EXPORT_SYMBOL(objagg_obj_root_priv);
+
+/**
+ * objagg_obj_delta_priv - obtains delta private for an object
+ * @objagg_obj: objagg object instance
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * Returns user private delta pointer or NULL in case the passed
+ * object is root.
+ */
+const void *objagg_obj_delta_priv(const struct objagg_obj *objagg_obj)
+{
+ if (objagg_obj_is_root(objagg_obj))
+ return NULL;
+ return objagg_obj->delta_priv;
+}
+EXPORT_SYMBOL(objagg_obj_delta_priv);
+
+/**
+ * objagg_obj_raw - obtains object user private pointer
+ * @objagg_obj: objagg object instance
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * Returns user private pointer as was passed to objagg_obj_get() by "obj" arg.
+ */
+const void *objagg_obj_raw(const struct objagg_obj *objagg_obj)
+{
+ return objagg_obj->obj;
+}
+EXPORT_SYMBOL(objagg_obj_raw);
+
+static struct objagg_obj *objagg_obj_lookup(struct objagg *objagg, void *obj)
+{
+ return rhashtable_lookup_fast(&objagg->obj_ht, obj, objagg->ht_params);
+}
+
+static int objagg_obj_parent_assign(struct objagg *objagg,
+ struct objagg_obj *objagg_obj,
+ struct objagg_obj *parent)
+{
+ void *delta_priv;
+
+ delta_priv = objagg->ops->delta_create(objagg->priv, parent->obj,
+ objagg_obj->obj);
+ if (IS_ERR(delta_priv))
+ return PTR_ERR(delta_priv);
+
+ /* User returned a delta private, that means that
+ * our object can be aggregated into the parent.
+ */
+ objagg_obj->parent = parent;
+ objagg_obj->delta_priv = delta_priv;
+ objagg_obj_ref_inc(objagg_obj->parent);
+ trace_objagg_obj_parent_assign(objagg, objagg_obj,
+ parent,
+ parent->refcount);
+ return 0;
+}
+
+static int objagg_obj_parent_lookup_assign(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ struct objagg_obj *objagg_obj_cur;
+ int err;
+
+ list_for_each_entry(objagg_obj_cur, &objagg->obj_list, list) {
+ /* Nesting is not supported. In case the object
+ * is not root, it cannot be assigned as parent.
+ */
+ if (!objagg_obj_is_root(objagg_obj_cur))
+ continue;
+ err = objagg_obj_parent_assign(objagg, objagg_obj,
+ objagg_obj_cur);
+ if (!err)
+ return 0;
+ }
+ return -ENOENT;
+}
+
+static void __objagg_obj_put(struct objagg *objagg,
+ struct objagg_obj *objagg_obj);
+
+static void objagg_obj_parent_unassign(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ trace_objagg_obj_parent_unassign(objagg, objagg_obj,
+ objagg_obj->parent,
+ objagg_obj->parent->refcount);
+ objagg->ops->delta_destroy(objagg->priv, objagg_obj->delta_priv);
+ __objagg_obj_put(objagg, objagg_obj->parent);
+}
+
+static int objagg_obj_root_create(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ objagg_obj->root_priv = objagg->ops->root_create(objagg->priv,
+ objagg_obj->obj);
+ if (IS_ERR(objagg_obj->root_priv))
+ return PTR_ERR(objagg_obj->root_priv);
+
+ trace_objagg_obj_root_create(objagg, objagg_obj);
+ return 0;
+}
+
+static void objagg_obj_root_destroy(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ trace_objagg_obj_root_destroy(objagg, objagg_obj);
+ objagg->ops->root_destroy(objagg->priv, objagg_obj->root_priv);
+}
+
+static int objagg_obj_init(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ int err;
+
+ /* Try to find if the object can be aggregated under an existing one. */
+ err = objagg_obj_parent_lookup_assign(objagg, objagg_obj);
+ if (!err)
+ return 0;
+ /* If aggregation is not possible, make the object a root. */
+ return objagg_obj_root_create(objagg, objagg_obj);
+}
+
+static void objagg_obj_fini(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ if (!objagg_obj_is_root(objagg_obj))
+ objagg_obj_parent_unassign(objagg, objagg_obj);
+ else
+ objagg_obj_root_destroy(objagg, objagg_obj);
+}
+
+static struct objagg_obj *objagg_obj_create(struct objagg *objagg, void *obj)
+{
+ struct objagg_obj *objagg_obj;
+ int err;
+
+ objagg_obj = kzalloc(sizeof(*objagg_obj) + objagg->ops->obj_size,
+ GFP_KERNEL);
+ if (!objagg_obj)
+ return ERR_PTR(-ENOMEM);
+ objagg_obj_ref_inc(objagg_obj);
+ memcpy(objagg_obj->obj, obj, objagg->ops->obj_size);
+
+ err = objagg_obj_init(objagg, objagg_obj);
+ if (err)
+ goto err_obj_init;
+
+ err = rhashtable_insert_fast(&objagg->obj_ht, &objagg_obj->ht_node,
+ objagg->ht_params);
+ if (err)
+ goto err_ht_insert;
+ list_add(&objagg_obj->list, &objagg->obj_list);
+ objagg->obj_count++;
+ trace_objagg_obj_create(objagg, objagg_obj);
+
+ return objagg_obj;
+
+err_ht_insert:
+ objagg_obj_fini(objagg, objagg_obj);
+err_obj_init:
+ kfree(objagg_obj);
+ return ERR_PTR(err);
+}
+
+static struct objagg_obj *__objagg_obj_get(struct objagg *objagg, void *obj)
+{
+ struct objagg_obj *objagg_obj;
+
+ /* First, try to find the object exactly as user passed it,
+ * perhaps it is already in use.
+ */
+ objagg_obj = objagg_obj_lookup(objagg, obj);
+ if (objagg_obj) {
+ objagg_obj_ref_inc(objagg_obj);
+ return objagg_obj;
+ }
+
+ return objagg_obj_create(objagg, obj);
+}
+
+/**
+ * objagg_obj_get - gets an object within objagg instance
+ * @objagg: objagg instance
+ * @obj: user-specific private object pointer
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * Size of the "obj" memory is specified in "objagg->ops".
+ *
+ * There are 3 main options this function wraps:
+ * 1) The object according to "obj" already exist. In that case
+ * the reference counter is incrementes and the object is returned.
+ * 2) The object does not exist, but it can be aggregated within
+ * another object. In that case, user ops->delta_create() is called
+ * to obtain delta data and a new object is created with returned
+ * user-delta private pointer.
+ * 3) The object does not exist and cannot be aggregated into
+ * any of the existing objects. In that case, user ops->root_create()
+ * is called to create the root and a new object is created with
+ * returned user-root private pointer.
+ *
+ * Returns a pointer to objagg object instance in case of success,
+ * otherwise it returns pointer error using ERR_PTR macro.
+ */
+struct objagg_obj *objagg_obj_get(struct objagg *objagg, void *obj)
+{
+ struct objagg_obj *objagg_obj;
+
+ objagg_obj = __objagg_obj_get(objagg, obj);
+ if (IS_ERR(objagg_obj))
+ return objagg_obj;
+ objagg_obj_stats_inc(objagg_obj);
+ trace_objagg_obj_get(objagg, objagg_obj, objagg_obj->refcount);
+ return objagg_obj;
+}
+EXPORT_SYMBOL(objagg_obj_get);
+
+static void objagg_obj_destroy(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ trace_objagg_obj_destroy(objagg, objagg_obj);
+ --objagg->obj_count;
+ list_del(&objagg_obj->list);
+ rhashtable_remove_fast(&objagg->obj_ht, &objagg_obj->ht_node,
+ objagg->ht_params);
+ objagg_obj_fini(objagg, objagg_obj);
+ kfree(objagg_obj);
+}
+
+static void __objagg_obj_put(struct objagg *objagg,
+ struct objagg_obj *objagg_obj)
+{
+ if (!objagg_obj_ref_dec(objagg_obj))
+ objagg_obj_destroy(objagg, objagg_obj);
+}
+
+/**
+ * objagg_obj_put - puts an object within objagg instance
+ * @objagg: objagg instance
+ * @objagg_obj: objagg object instance
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * Symmetric to objagg_obj_get().
+ */
+void objagg_obj_put(struct objagg *objagg, struct objagg_obj *objagg_obj)
+{
+ trace_objagg_obj_put(objagg, objagg_obj, objagg_obj->refcount);
+ objagg_obj_stats_dec(objagg_obj);
+ __objagg_obj_put(objagg, objagg_obj);
+}
+EXPORT_SYMBOL(objagg_obj_put);
+
+/**
+ * objagg_create - creates a new objagg instance
+ * @ops: user-specific callbacks
+ * @priv: pointer to a private data passed to the ops
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * The purpose of the library is to provide an infrastructure to
+ * aggregate user-specified objects. Library does not care about the type
+ * of the object. User fills-up ops which take care of the specific
+ * user object manipulation.
+ *
+ * As a very stupid example, consider integer numbers. For example
+ * number 8 as a root object. That can aggregate number 9 with delta 1,
+ * number 10 with delta 2, etc. This example is implemented as
+ * a part of a testing module in test_objagg.c file.
+ *
+ * Each objagg instance contains multiple trees. Each tree node is
+ * represented by "an object". In the current implementation there can be
+ * only roots and leafs nodes. Leaf nodes are called deltas.
+ * But in general, this can be easily extended for intermediate nodes.
+ * In that extension, a delta would be associated with all non-root
+ * nodes.
+ *
+ * Returns a pointer to newly created objagg instance in case of success,
+ * otherwise it returns pointer error using ERR_PTR macro.
+ */
+struct objagg *objagg_create(const struct objagg_ops *ops, void *priv)
+{
+ struct objagg *objagg;
+ int err;
+
+ if (WARN_ON(!ops || !ops->root_create || !ops->root_destroy ||
+ !ops->delta_create || !ops->delta_destroy))
+ return ERR_PTR(-EINVAL);
+ objagg = kzalloc(sizeof(*objagg), GFP_KERNEL);
+ if (!objagg)
+ return ERR_PTR(-ENOMEM);
+ objagg->ops = ops;
+ objagg->priv = priv;
+ INIT_LIST_HEAD(&objagg->obj_list);
+
+ objagg->ht_params.key_len = ops->obj_size;
+ objagg->ht_params.key_offset = offsetof(struct objagg_obj, obj);
+ objagg->ht_params.head_offset = offsetof(struct objagg_obj, ht_node);
+
+ err = rhashtable_init(&objagg->obj_ht, &objagg->ht_params);
+ if (err)
+ goto err_rhashtable_init;
+
+ trace_objagg_create(objagg);
+ return objagg;
+
+err_rhashtable_init:
+ kfree(objagg);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(objagg_create);
+
+/**
+ * objagg_destroy - destroys a new objagg instance
+ * @objagg: objagg instance
+ *
+ * Note: all locking must be provided by the caller.
+ */
+void objagg_destroy(struct objagg *objagg)
+{
+ trace_objagg_destroy(objagg);
+ WARN_ON(!list_empty(&objagg->obj_list));
+ rhashtable_destroy(&objagg->obj_ht);
+ kfree(objagg);
+}
+EXPORT_SYMBOL(objagg_destroy);
+
+static int objagg_stats_info_sort_cmp_func(const void *a, const void *b)
+{
+ const struct objagg_obj_stats_info *stats_info1 = a;
+ const struct objagg_obj_stats_info *stats_info2 = b;
+
+ if (stats_info1->is_root != stats_info2->is_root)
+ return stats_info2->is_root - stats_info1->is_root;
+ if (stats_info1->stats.delta_user_count !=
+ stats_info2->stats.delta_user_count)
+ return stats_info2->stats.delta_user_count -
+ stats_info1->stats.delta_user_count;
+ return stats_info2->stats.user_count - stats_info1->stats.user_count;
+}
+
+/**
+ * objagg_stats_get - obtains stats of the objagg instance
+ * @objagg: objagg instance
+ *
+ * Note: all locking must be provided by the caller.
+ *
+ * The returned structure contains statistics of all object
+ * currently in use, ordered by following rules:
+ * 1) Root objects are always on lower indexes than the rest.
+ * 2) Objects with higher delta user count are always on lower
+ * indexes.
+ * 3) In case more objects have the same delta user count,
+ * the objects are ordered by user count.
+ *
+ * Returns a pointer to stats instance in case of success,
+ * otherwise it returns pointer error using ERR_PTR macro.
+ */
+const struct objagg_stats *objagg_stats_get(struct objagg *objagg)
+{
+ struct objagg_stats *objagg_stats;
+ struct objagg_obj *objagg_obj;
+ size_t alloc_size;
+ int i;
+
+ alloc_size = sizeof(*objagg_stats) +
+ sizeof(objagg_stats->stats_info[0]) * objagg->obj_count;
+ objagg_stats = kzalloc(alloc_size, GFP_KERNEL);
+ if (!objagg_stats)
+ return ERR_PTR(-ENOMEM);
+
+ i = 0;
+ list_for_each_entry(objagg_obj, &objagg->obj_list, list) {
+ memcpy(&objagg_stats->stats_info[i].stats, &objagg_obj->stats,
+ sizeof(objagg_stats->stats_info[0].stats));
+ objagg_stats->stats_info[i].objagg_obj = objagg_obj;
+ objagg_stats->stats_info[i].is_root =
+ objagg_obj_is_root(objagg_obj);
+ i++;
+ }
+ objagg_stats->stats_info_count = i;
+
+ sort(objagg_stats->stats_info, objagg_stats->stats_info_count,
+ sizeof(struct objagg_obj_stats_info),
+ objagg_stats_info_sort_cmp_func, NULL);
+
+ return objagg_stats;
+}
+EXPORT_SYMBOL(objagg_stats_get);
+
+/**
+ * objagg_stats_puts - puts stats of the objagg instance
+ * @objagg_stats: objagg instance stats
+ *
+ * Note: all locking must be provided by the caller.
+ */
+void objagg_stats_put(const struct objagg_stats *objagg_stats)
+{
+ kfree(objagg_stats);
+}
+EXPORT_SYMBOL(objagg_stats_put);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Jiri Pirko <jiri@...lanox.com>");
+MODULE_DESCRIPTION("Object aggregation manager");
diff --git a/lib/test_objagg.c b/lib/test_objagg.c
new file mode 100644
index 000000000000..aac5d8e8800c
--- /dev/null
+++ b/lib/test_objagg.c
@@ -0,0 +1,835 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/objagg.h>
+
+struct tokey {
+ unsigned int id;
+};
+
+#define NUM_KEYS 32
+
+static int key_id_index(unsigned int key_id)
+{
+ if (key_id >= NUM_KEYS) {
+ WARN_ON(1);
+ return 0;
+ }
+ return key_id;
+}
+
+#define BUF_LEN 128
+
+struct world {
+ unsigned int root_count;
+ unsigned int delta_count;
+ char next_root_buf[BUF_LEN];
+ struct objagg_obj *objagg_objs[NUM_KEYS];
+ unsigned int key_refs[NUM_KEYS];
+};
+
+struct root {
+ struct tokey key;
+ char buf[BUF_LEN];
+};
+
+struct delta {
+ unsigned int key_id_diff;
+};
+
+static struct objagg_obj *world_obj_get(struct world *world,
+ struct objagg *objagg,
+ unsigned int key_id)
+{
+ struct objagg_obj *objagg_obj;
+ struct tokey key;
+ int err;
+
+ key.id = key_id;
+ objagg_obj = objagg_obj_get(objagg, &key);
+ if (IS_ERR(objagg_obj)) {
+ pr_err("Key %u: Failed to get object.\n", key_id);
+ return objagg_obj;
+ }
+ if (!world->key_refs[key_id_index(key_id)]) {
+ world->objagg_objs[key_id_index(key_id)] = objagg_obj;
+ } else if (world->objagg_objs[key_id_index(key_id)] != objagg_obj) {
+ pr_err("Key %u: God another object for the same key.\n",
+ key_id);
+ err = -EINVAL;
+ goto err_key_id_check;
+ }
+ world->key_refs[key_id_index(key_id)]++;
+ return objagg_obj;
+
+err_key_id_check:
+ objagg_obj_put(objagg, objagg_obj);
+ return ERR_PTR(err);
+}
+
+static void world_obj_put(struct world *world, struct objagg *objagg,
+ unsigned int key_id)
+{
+ struct objagg_obj *objagg_obj;
+
+ if (!world->key_refs[key_id_index(key_id)])
+ return;
+ objagg_obj = world->objagg_objs[key_id_index(key_id)];
+ objagg_obj_put(objagg, objagg_obj);
+ world->key_refs[key_id_index(key_id)]--;
+}
+
+#define MAX_KEY_ID_DIFF 5
+
+static void *delta_create(void *priv, void *parent_obj, void *obj)
+{
+ struct tokey *parent_key = parent_obj;
+ struct world *world = priv;
+ struct tokey *key = obj;
+ int diff = key->id - parent_key->id;
+ struct delta *delta;
+
+ if (diff < 0 || diff > MAX_KEY_ID_DIFF)
+ return ERR_PTR(-EINVAL);
+
+ delta = kzalloc(sizeof(*delta), GFP_KERNEL);
+ if (!delta)
+ return ERR_PTR(-ENOMEM);
+ delta->key_id_diff = diff;
+ world->delta_count++;
+ return delta;
+}
+
+static void delta_destroy(void *priv, void *delta_priv)
+{
+ struct delta *delta = delta_priv;
+ struct world *world = priv;
+
+ world->delta_count--;
+ kfree(delta);
+}
+
+static void *root_create(void *priv, void *obj)
+{
+ struct world *world = priv;
+ struct tokey *key = obj;
+ struct root *root;
+
+ root = kzalloc(sizeof(*root), GFP_KERNEL);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&root->key, key, sizeof(root->key));
+ memcpy(root->buf, world->next_root_buf, sizeof(root->buf));
+ world->root_count++;
+ return root;
+}
+
+static void root_destroy(void *priv, void *root_priv)
+{
+ struct root *root = root_priv;
+ struct world *world = priv;
+
+ world->root_count--;
+ kfree(root);
+}
+
+static int test_nodelta_obj_get(struct world *world, struct objagg *objagg,
+ unsigned int key_id, bool should_create_root)
+{
+ unsigned int orig_root_count = world->root_count;
+ struct objagg_obj *objagg_obj;
+ const struct root *root;
+ int err;
+
+ if (should_create_root)
+ prandom_bytes(world->next_root_buf,
+ sizeof(world->next_root_buf));
+
+ objagg_obj = world_obj_get(world, objagg, key_id);
+ if (IS_ERR(objagg_obj)) {
+ pr_err("Key %u: Failed to get object.\n", key_id);
+ return PTR_ERR(objagg_obj);
+ }
+ if (should_create_root) {
+ if (world->root_count != orig_root_count + 1) {
+ pr_err("Key %u: Root was not created\n", key_id);
+ err = -EINVAL;
+ goto err_check_root_count;
+ }
+ } else {
+ if (world->root_count != orig_root_count) {
+ pr_err("Key %u: Root was incorrectly created\n",
+ key_id);
+ err = -EINVAL;
+ goto err_check_root_count;
+ }
+ }
+ root = objagg_obj_root_priv(objagg_obj);
+ if (root->key.id != key_id) {
+ pr_err("Key %u: Root has unexpected key id\n", key_id);
+ err = -EINVAL;
+ goto err_check_key_id;
+ }
+ if (should_create_root &&
+ memcmp(world->next_root_buf, root->buf, sizeof(root->buf))) {
+ pr_err("Key %u: Buffer does not match the expected content\n",
+ key_id);
+ err = -EINVAL;
+ goto err_check_buf;
+ }
+ return 0;
+
+err_check_buf:
+err_check_key_id:
+err_check_root_count:
+ objagg_obj_put(objagg, objagg_obj);
+ return err;
+}
+
+static int test_nodelta_obj_put(struct world *world, struct objagg *objagg,
+ unsigned int key_id, bool should_destroy_root)
+{
+ unsigned int orig_root_count = world->root_count;
+
+ world_obj_put(world, objagg, key_id);
+
+ if (should_destroy_root) {
+ if (world->root_count != orig_root_count - 1) {
+ pr_err("Key %u: Root was not destroyed\n", key_id);
+ return -EINVAL;
+ }
+ } else {
+ if (world->root_count != orig_root_count) {
+ pr_err("Key %u: Root was incorrectly destroyed\n",
+ key_id);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int check_stats_zero(struct objagg *objagg)
+{
+ const struct objagg_stats *stats;
+ int err = 0;
+
+ stats = objagg_stats_get(objagg);
+ if (IS_ERR(stats))
+ return PTR_ERR(stats);
+
+ if (stats->stats_info_count != 0) {
+ pr_err("Stats: Object count is not zero while it should be\n");
+ err = -EINVAL;
+ }
+
+ objagg_stats_put(stats);
+ return err;
+}
+
+static int check_stats_nodelta(struct objagg *objagg)
+{
+ const struct objagg_stats *stats;
+ int i;
+ int err;
+
+ stats = objagg_stats_get(objagg);
+ if (IS_ERR(stats))
+ return PTR_ERR(stats);
+
+ if (stats->stats_info_count != NUM_KEYS) {
+ pr_err("Stats: Unexpected object count (%u expected, %u returned)\n",
+ NUM_KEYS, stats->stats_info_count);
+ err = -EINVAL;
+ goto stats_put;
+ }
+
+ for (i = 0; i < stats->stats_info_count; i++) {
+ if (stats->stats_info[i].stats.user_count != 2) {
+ pr_err("Stats: incorrect user count\n");
+ err = -EINVAL;
+ goto stats_put;
+ }
+ if (stats->stats_info[i].stats.delta_user_count != 2) {
+ pr_err("Stats: incorrect delta user count\n");
+ err = -EINVAL;
+ goto stats_put;
+ }
+ }
+ err = 0;
+
+stats_put:
+ objagg_stats_put(stats);
+ return err;
+}
+
+static void *delta_create_dummy(void *priv, void *parent_obj, void *obj)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
+static void delta_destroy_dummy(void *priv, void *delta_priv)
+{
+}
+
+static const struct objagg_ops nodelta_ops = {
+ .obj_size = sizeof(struct tokey),
+ .delta_create = delta_create_dummy,
+ .delta_destroy = delta_destroy_dummy,
+ .root_create = root_create,
+ .root_destroy = root_destroy,
+};
+
+static int test_nodelta(void)
+{
+ struct world world = {};
+ struct objagg *objagg;
+ int i;
+ int err;
+
+ objagg = objagg_create(&nodelta_ops, &world);
+ if (IS_ERR(objagg))
+ return PTR_ERR(objagg);
+
+ err = check_stats_zero(objagg);
+ if (err)
+ goto err_stats_first_zero;
+
+ /* First round of gets, the root objects should be created */
+ for (i = 0; i < NUM_KEYS; i++) {
+ err = test_nodelta_obj_get(&world, objagg, i, true);
+ if (err)
+ goto err_obj_first_get;
+ }
+
+ /* Do the second round of gets, all roots are already created,
+ * make sure that no new root is created
+ */
+ for (i = 0; i < NUM_KEYS; i++) {
+ err = test_nodelta_obj_get(&world, objagg, i, false);
+ if (err)
+ goto err_obj_second_get;
+ }
+
+ err = check_stats_nodelta(objagg);
+ if (err)
+ goto err_stats_nodelta;
+
+ for (i = NUM_KEYS - 1; i >= 0; i--) {
+ err = test_nodelta_obj_put(&world, objagg, i, false);
+ if (err)
+ goto err_obj_first_put;
+ }
+ for (i = NUM_KEYS - 1; i >= 0; i--) {
+ err = test_nodelta_obj_put(&world, objagg, i, true);
+ if (err)
+ goto err_obj_second_put;
+ }
+
+ err = check_stats_zero(objagg);
+ if (err)
+ goto err_stats_second_zero;
+
+ objagg_destroy(objagg);
+ return 0;
+
+err_stats_nodelta:
+err_obj_first_put:
+err_obj_second_get:
+ for (i--; i >= 0; i--)
+ world_obj_put(&world, objagg, i);
+
+ i = NUM_KEYS;
+err_obj_first_get:
+err_obj_second_put:
+ for (i--; i >= 0; i--)
+ world_obj_put(&world, objagg, i);
+err_stats_first_zero:
+err_stats_second_zero:
+ objagg_destroy(objagg);
+ return err;
+}
+
+static const struct objagg_ops delta_ops = {
+ .obj_size = sizeof(struct tokey),
+ .delta_create = delta_create,
+ .delta_destroy = delta_destroy,
+ .root_create = root_create,
+ .root_destroy = root_destroy,
+};
+
+enum action {
+ ACTION_GET,
+ ACTION_PUT,
+};
+
+enum expect_delta {
+ EXPECT_DELTA_SAME,
+ EXPECT_DELTA_INC,
+ EXPECT_DELTA_DEC,
+};
+
+enum expect_root {
+ EXPECT_ROOT_SAME,
+ EXPECT_ROOT_INC,
+ EXPECT_ROOT_DEC,
+};
+
+struct expect_stats_info {
+ struct objagg_obj_stats stats;
+ bool is_root;
+ unsigned int key_id;
+};
+
+struct expect_stats {
+ unsigned int info_count;
+ struct expect_stats_info info[NUM_KEYS];
+};
+
+struct action_item {
+ unsigned int key_id;
+ enum action action;
+ enum expect_delta expect_delta;
+ enum expect_root expect_root;
+ struct expect_stats expect_stats;
+};
+
+#define EXPECT_STATS(count, ...) \
+{ \
+ .info_count = count, \
+ .info = { __VA_ARGS__ } \
+}
+
+#define ROOT(key_id, user_count, delta_user_count) \
+ {{user_count, delta_user_count}, true, key_id}
+
+#define DELTA(key_id, user_count) \
+ {{user_count, user_count}, false, key_id}
+
+static const struct action_item action_items[] = {
+ {
+ 1, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_INC,
+ EXPECT_STATS(1, ROOT(1, 1, 1)),
+ }, /* r: 1 d: */
+ {
+ 7, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_INC,
+ EXPECT_STATS(2, ROOT(1, 1, 1), ROOT(7, 1, 1)),
+ }, /* r: 1, 7 d: */
+ {
+ 3, ACTION_GET, EXPECT_DELTA_INC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(3, ROOT(1, 1, 2), ROOT(7, 1, 1),
+ DELTA(3, 1)),
+ }, /* r: 1, 7 d: 3^1 */
+ {
+ 5, ACTION_GET, EXPECT_DELTA_INC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(4, ROOT(1, 1, 3), ROOT(7, 1, 1),
+ DELTA(3, 1), DELTA(5, 1)),
+ }, /* r: 1, 7 d: 3^1, 5^1 */
+ {
+ 3, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(4, ROOT(1, 1, 4), ROOT(7, 1, 1),
+ DELTA(3, 2), DELTA(5, 1)),
+ }, /* r: 1, 7 d: 3^1, 3^1, 5^1 */
+ {
+ 1, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(4, ROOT(1, 2, 5), ROOT(7, 1, 1),
+ DELTA(3, 2), DELTA(5, 1)),
+ }, /* r: 1, 1, 7 d: 3^1, 3^1, 5^1 */
+ {
+ 30, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_INC,
+ EXPECT_STATS(5, ROOT(1, 2, 5), ROOT(7, 1, 1), ROOT(30, 1, 1),
+ DELTA(3, 2), DELTA(5, 1)),
+ }, /* r: 1, 1, 7, 30 d: 3^1, 3^1, 5^1 */
+ {
+ 8, ACTION_GET, EXPECT_DELTA_INC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(6, ROOT(1, 2, 5), ROOT(7, 1, 2), ROOT(30, 1, 1),
+ DELTA(3, 2), DELTA(5, 1), DELTA(8, 1)),
+ }, /* r: 1, 1, 7, 30 d: 3^1, 3^1, 5^1, 8^7 */
+ {
+ 8, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(6, ROOT(1, 2, 5), ROOT(7, 1, 3), ROOT(30, 1, 1),
+ DELTA(3, 2), DELTA(8, 2), DELTA(5, 1)),
+ }, /* r: 1, 1, 7, 30 d: 3^1, 3^1, 5^1, 8^7, 8^7 */
+ {
+ 3, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(6, ROOT(1, 2, 4), ROOT(7, 1, 3), ROOT(30, 1, 1),
+ DELTA(8, 2), DELTA(3, 1), DELTA(5, 1)),
+ }, /* r: 1, 1, 7, 30 d: 3^1, 5^1, 8^7, 8^7 */
+ {
+ 3, ACTION_PUT, EXPECT_DELTA_DEC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(1, 2, 3), ROOT(7, 1, 3), ROOT(30, 1, 1),
+ DELTA(8, 2), DELTA(5, 1)),
+ }, /* r: 1, 1, 7, 30 d: 5^1, 8^7, 8^7 */
+ {
+ 1, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 3), ROOT(1, 1, 2), ROOT(30, 1, 1),
+ DELTA(8, 2), DELTA(5, 1)),
+ }, /* r: 1, 7, 30 d: 5^1, 8^7, 8^7 */
+ {
+ 1, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 3), ROOT(30, 1, 1), ROOT(1, 0, 1),
+ DELTA(8, 2), DELTA(5, 1)),
+ }, /* r: 7, 30 d: 5^1, 8^7, 8^7 */
+ {
+ 5, ACTION_PUT, EXPECT_DELTA_DEC, EXPECT_ROOT_DEC,
+ EXPECT_STATS(3, ROOT(7, 1, 3), ROOT(30, 1, 1),
+ DELTA(8, 2)),
+ }, /* r: 7, 30 d: 8^7, 8^7 */
+ {
+ 5, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_INC,
+ EXPECT_STATS(4, ROOT(7, 1, 3), ROOT(30, 1, 1), ROOT(5, 1, 1),
+ DELTA(8, 2)),
+ }, /* r: 7, 30, 5 d: 8^7, 8^7 */
+ {
+ 6, ACTION_GET, EXPECT_DELTA_INC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 3), ROOT(5, 1, 2), ROOT(30, 1, 1),
+ DELTA(8, 2), DELTA(6, 1)),
+ }, /* r: 7, 30, 5 d: 8^7, 8^7, 6^5 */
+ {
+ 8, ACTION_GET, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 4), ROOT(5, 1, 2), ROOT(30, 1, 1),
+ DELTA(8, 3), DELTA(6, 1)),
+ }, /* r: 7, 30, 5 d: 8^7, 8^7, 8^7, 6^5 */
+ {
+ 8, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 3), ROOT(5, 1, 2), ROOT(30, 1, 1),
+ DELTA(8, 2), DELTA(6, 1)),
+ }, /* r: 7, 30, 5 d: 8^7, 8^7, 6^5 */
+ {
+ 8, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(7, 1, 2), ROOT(5, 1, 2), ROOT(30, 1, 1),
+ DELTA(8, 1), DELTA(6, 1)),
+ }, /* r: 7, 30, 5 d: 8^7, 6^5 */
+ {
+ 8, ACTION_PUT, EXPECT_DELTA_DEC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(4, ROOT(5, 1, 2), ROOT(7, 1, 1), ROOT(30, 1, 1),
+ DELTA(6, 1)),
+ }, /* r: 7, 30, 5 d: 6^5 */
+ {
+ 8, ACTION_GET, EXPECT_DELTA_INC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(5, ROOT(5, 1, 3), ROOT(7, 1, 1), ROOT(30, 1, 1),
+ DELTA(6, 1), DELTA(8, 1)),
+ }, /* r: 7, 30, 5 d: 6^5, 8^5 */
+ {
+ 7, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_DEC,
+ EXPECT_STATS(4, ROOT(5, 1, 3), ROOT(30, 1, 1),
+ DELTA(6, 1), DELTA(8, 1)),
+ }, /* r: 30, 5 d: 6^5, 8^5 */
+ {
+ 30, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_DEC,
+ EXPECT_STATS(3, ROOT(5, 1, 3),
+ DELTA(6, 1), DELTA(8, 1)),
+ }, /* r: 5 d: 6^5, 8^5 */
+ {
+ 5, ACTION_PUT, EXPECT_DELTA_SAME, EXPECT_ROOT_SAME,
+ EXPECT_STATS(3, ROOT(5, 0, 2),
+ DELTA(6, 1), DELTA(8, 1)),
+ }, /* r: d: 6^5, 8^5 */
+ {
+ 6, ACTION_PUT, EXPECT_DELTA_DEC, EXPECT_ROOT_SAME,
+ EXPECT_STATS(2, ROOT(5, 0, 1),
+ DELTA(8, 1)),
+ }, /* r: d: 6^5 */
+ {
+ 8, ACTION_PUT, EXPECT_DELTA_DEC, EXPECT_ROOT_DEC,
+ EXPECT_STATS(0, ),
+ }, /* r: d: */
+};
+
+static int check_expect(struct world *world,
+ const struct action_item *action_item,
+ unsigned int orig_delta_count,
+ unsigned int orig_root_count)
+{
+ unsigned int key_id = action_item->key_id;
+
+ switch (action_item->expect_delta) {
+ case EXPECT_DELTA_SAME:
+ if (orig_delta_count != world->delta_count) {
+ pr_err("Key %u: Delta count changed while expected to remain the same.\n",
+ key_id);
+ return -EINVAL;
+ }
+ break;
+ case EXPECT_DELTA_INC:
+ if (WARN_ON(action_item->action == ACTION_PUT))
+ return -EINVAL;
+ if (orig_delta_count + 1 != world->delta_count) {
+ pr_err("Key %u: Delta count was not incremented.\n",
+ key_id);
+ return -EINVAL;
+ }
+ break;
+ case EXPECT_DELTA_DEC:
+ if (WARN_ON(action_item->action == ACTION_GET))
+ return -EINVAL;
+ if (orig_delta_count - 1 != world->delta_count) {
+ pr_err("Key %u: Delta count was not decremented.\n",
+ key_id);
+ return -EINVAL;
+ }
+ break;
+ }
+
+ switch (action_item->expect_root) {
+ case EXPECT_ROOT_SAME:
+ if (orig_root_count != world->root_count) {
+ pr_err("Key %u: Root count changed while expected to remain the same.\n",
+ key_id);
+ return -EINVAL;
+ }
+ break;
+ case EXPECT_ROOT_INC:
+ if (WARN_ON(action_item->action == ACTION_PUT))
+ return -EINVAL;
+ if (orig_root_count + 1 != world->root_count) {
+ pr_err("Key %u: Root count was not incremented.\n",
+ key_id);
+ return -EINVAL;
+ }
+ break;
+ case EXPECT_ROOT_DEC:
+ if (WARN_ON(action_item->action == ACTION_GET))
+ return -EINVAL;
+ if (orig_root_count - 1 != world->root_count) {
+ pr_err("Key %u: Root count was not decremented.\n",
+ key_id);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static unsigned int obj_to_key_id(struct objagg_obj *objagg_obj)
+{
+ const struct tokey *root_key;
+ const struct delta *delta;
+ unsigned int key_id;
+
+ root_key = objagg_obj_root_priv(objagg_obj);
+ key_id = root_key->id;
+ delta = objagg_obj_delta_priv(objagg_obj);
+ if (delta)
+ key_id += delta->key_id_diff;
+ return key_id;
+}
+
+static int
+check_expect_stats_nums(const struct objagg_obj_stats_info *stats_info,
+ const struct expect_stats_info *expect_stats_info,
+ const char **errmsg)
+{
+ if (stats_info->is_root != expect_stats_info->is_root) {
+ if (errmsg)
+ *errmsg = "Incorrect root/delta indication";
+ return -EINVAL;
+ }
+ if (stats_info->stats.user_count !=
+ expect_stats_info->stats.user_count) {
+ if (errmsg)
+ *errmsg = "Incorrect user count";
+ return -EINVAL;
+ }
+ if (stats_info->stats.delta_user_count !=
+ expect_stats_info->stats.delta_user_count) {
+ if (errmsg)
+ *errmsg = "Incorrect delta user count";
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int
+check_expect_stats_key_id(const struct objagg_obj_stats_info *stats_info,
+ const struct expect_stats_info *expect_stats_info,
+ const char **errmsg)
+{
+ if (obj_to_key_id(stats_info->objagg_obj) !=
+ expect_stats_info->key_id) {
+ if (errmsg)
+ *errmsg = "incorrect key id";
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int check_expect_stats_neigh(const struct objagg_stats *stats,
+ const struct expect_stats *expect_stats,
+ int pos)
+{
+ int i;
+ int err;
+
+ for (i = pos - 1; i >= 0; i--) {
+ err = check_expect_stats_nums(&stats->stats_info[i],
+ &expect_stats->info[pos], NULL);
+ if (err)
+ break;
+ err = check_expect_stats_key_id(&stats->stats_info[i],
+ &expect_stats->info[pos], NULL);
+ if (!err)
+ return 0;
+ }
+ for (i = pos + 1; i < stats->stats_info_count; i++) {
+ err = check_expect_stats_nums(&stats->stats_info[i],
+ &expect_stats->info[pos], NULL);
+ if (err)
+ break;
+ err = check_expect_stats_key_id(&stats->stats_info[i],
+ &expect_stats->info[pos], NULL);
+ if (!err)
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int __check_expect_stats(const struct objagg_stats *stats,
+ const struct expect_stats *expect_stats,
+ const char **errmsg)
+{
+ int i;
+ int err;
+
+ if (stats->stats_info_count != expect_stats->info_count) {
+ *errmsg = "Unexpected object count";
+ return -EINVAL;
+ }
+
+ for (i = 0; i < stats->stats_info_count; i++) {
+ err = check_expect_stats_nums(&stats->stats_info[i],
+ &expect_stats->info[i], errmsg);
+ if (err)
+ return err;
+ err = check_expect_stats_key_id(&stats->stats_info[i],
+ &expect_stats->info[i], errmsg);
+ if (err) {
+ /* It is possible that one of the neighbor stats with
+ * same numbers have the correct key id, so check it
+ */
+ err = check_expect_stats_neigh(stats, expect_stats, i);
+ if (err)
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int check_expect_stats(struct objagg *objagg,
+ const struct expect_stats *expect_stats,
+ const char **errmsg)
+{
+ const struct objagg_stats *stats;
+ int err;
+
+ stats = objagg_stats_get(objagg);
+ if (IS_ERR(stats))
+ return PTR_ERR(stats);
+ err = __check_expect_stats(stats, expect_stats, errmsg);
+ objagg_stats_put(stats);
+ return err;
+}
+
+static int test_delta_action_item(struct world *world,
+ struct objagg *objagg,
+ const struct action_item *action_item,
+ bool inverse)
+{
+ unsigned int orig_delta_count = world->delta_count;
+ unsigned int orig_root_count = world->root_count;
+ unsigned int key_id = action_item->key_id;
+ enum action action = action_item->action;
+ struct objagg_obj *objagg_obj;
+ const char *errmsg;
+ int err;
+
+ if (inverse)
+ action = action == ACTION_GET ? ACTION_PUT : ACTION_GET;
+
+ switch (action) {
+ case ACTION_GET:
+ objagg_obj = world_obj_get(world, objagg, key_id);
+ if (IS_ERR(objagg_obj))
+ return PTR_ERR(objagg_obj);
+ break;
+ case ACTION_PUT:
+ world_obj_put(world, objagg, key_id);
+ break;
+ }
+
+ if (inverse)
+ return 0;
+ err = check_expect(world, action_item,
+ orig_delta_count, orig_root_count);
+ if (err)
+ goto errout;
+
+ err = check_expect_stats(objagg, &action_item->expect_stats, &errmsg);
+ if (err) {
+ pr_err("Key %u: Stats: %s\n", action_item->key_id, errmsg);
+ goto errout;
+ }
+
+ return 0;
+
+errout:
+ /* This can only happen when action is not inversed.
+ * So in case of an error, cleanup by doing inverse action.
+ */
+ test_delta_action_item(world, objagg, action_item, true);
+ return err;
+}
+
+static int test_delta(void)
+{
+ struct world world = {};
+ struct objagg *objagg;
+ int i;
+ int err;
+
+ objagg = objagg_create(&delta_ops, &world);
+ if (IS_ERR(objagg))
+ return PTR_ERR(objagg);
+
+ for (i = 0; i < ARRAY_SIZE(action_items); i++) {
+ err = test_delta_action_item(&world, objagg,
+ &action_items[i], false);
+ if (err)
+ goto err_do_action_item;
+ }
+
+ objagg_destroy(objagg);
+ return 0;
+
+err_do_action_item:
+ for (i--; i >= 0; i--)
+ test_delta_action_item(&world, objagg, &action_items[i], true);
+
+ objagg_destroy(objagg);
+ return err;
+}
+
+static int __init test_objagg_init(void)
+{
+ int err;
+
+ err = test_nodelta();
+ if (err)
+ return err;
+ return test_delta();
+}
+
+static void __exit test_objagg_exit(void)
+{
+}
+
+module_init(test_objagg_init);
+module_exit(test_objagg_exit);
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Jiri Pirko <jiri@...lanox.com>");
+MODULE_DESCRIPTION("Test module for objagg");
--
2.19.1
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