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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /include/rdma/restrack.h
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/rdma/restrack.h')
-rw-r--r--include/rdma/restrack.h197
1 files changed, 197 insertions, 0 deletions
diff --git a/include/rdma/restrack.h b/include/rdma/restrack.h
new file mode 100644
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+++ b/include/rdma/restrack.h
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+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
+ */
+
+#ifndef _RDMA_RESTRACK_H_
+#define _RDMA_RESTRACK_H_
+
+#include <linux/typecheck.h>
+#include <linux/rwsem.h>
+#include <linux/sched.h>
+#include <linux/kref.h>
+#include <linux/completion.h>
+#include <linux/sched/task.h>
+#include <uapi/rdma/rdma_netlink.h>
+
+/**
+ * enum rdma_restrack_type - HW objects to track
+ */
+enum rdma_restrack_type {
+ /**
+ * @RDMA_RESTRACK_PD: Protection domain (PD)
+ */
+ RDMA_RESTRACK_PD,
+ /**
+ * @RDMA_RESTRACK_CQ: Completion queue (CQ)
+ */
+ RDMA_RESTRACK_CQ,
+ /**
+ * @RDMA_RESTRACK_QP: Queue pair (QP)
+ */
+ RDMA_RESTRACK_QP,
+ /**
+ * @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
+ */
+ RDMA_RESTRACK_CM_ID,
+ /**
+ * @RDMA_RESTRACK_MR: Memory Region (MR)
+ */
+ RDMA_RESTRACK_MR,
+ /**
+ * @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
+ */
+ RDMA_RESTRACK_MAX
+};
+
+#define RDMA_RESTRACK_HASH_BITS 8
+struct rdma_restrack_entry;
+
+/**
+ * struct rdma_restrack_root - main resource tracking management
+ * entity, per-device
+ */
+struct rdma_restrack_root {
+ /*
+ * @rwsem: Read/write lock to protect lists
+ */
+ struct rw_semaphore rwsem;
+ /**
+ * @hash: global database for all resources per-device
+ */
+ DECLARE_HASHTABLE(hash, RDMA_RESTRACK_HASH_BITS);
+ /**
+ * @fill_res_entry: driver-specific fill function
+ *
+ * Allows rdma drivers to add their own restrack attributes.
+ */
+ int (*fill_res_entry)(struct sk_buff *msg,
+ struct rdma_restrack_entry *entry);
+};
+
+/**
+ * struct rdma_restrack_entry - metadata per-entry
+ */
+struct rdma_restrack_entry {
+ /**
+ * @valid: validity indicator
+ *
+ * The entries are filled during rdma_restrack_add,
+ * can be attempted to be free during rdma_restrack_del.
+ *
+ * As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
+ */
+ bool valid;
+ /*
+ * @kref: Protect destroy of the resource
+ */
+ struct kref kref;
+ /*
+ * @comp: Signal that all consumers of resource are completed their work
+ */
+ struct completion comp;
+ /**
+ * @task: owner of resource tracking entity
+ *
+ * There are two types of entities: created by user and created
+ * by kernel.
+ *
+ * This is relevant for the entities created by users.
+ * For the entities created by kernel, this pointer will be NULL.
+ */
+ struct task_struct *task;
+ /**
+ * @kern_name: name of owner for the kernel created entities.
+ */
+ const char *kern_name;
+ /**
+ * @node: hash table entry
+ */
+ struct hlist_node node;
+ /**
+ * @type: various objects in restrack database
+ */
+ enum rdma_restrack_type type;
+};
+
+/**
+ * rdma_restrack_init() - initialize resource tracking
+ * @res: resource tracking root
+ */
+void rdma_restrack_init(struct rdma_restrack_root *res);
+
+/**
+ * rdma_restrack_clean() - clean resource tracking
+ * @res: resource tracking root
+ */
+void rdma_restrack_clean(struct rdma_restrack_root *res);
+
+/**
+ * rdma_restrack_count() - the current usage of specific object
+ * @res: resource entry
+ * @type: actual type of object to operate
+ * @ns: PID namespace
+ */
+int rdma_restrack_count(struct rdma_restrack_root *res,
+ enum rdma_restrack_type type,
+ struct pid_namespace *ns);
+
+/**
+ * rdma_restrack_add() - add object to the reource tracking database
+ * @res: resource entry
+ */
+void rdma_restrack_add(struct rdma_restrack_entry *res);
+
+/**
+ * rdma_restrack_del() - delete object from the reource tracking database
+ * @res: resource entry
+ * @type: actual type of object to operate
+ */
+void rdma_restrack_del(struct rdma_restrack_entry *res);
+
+/**
+ * rdma_is_kernel_res() - check the owner of resource
+ * @res: resource entry
+ */
+static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
+{
+ return !res->task;
+}
+
+/**
+ * rdma_restrack_get() - grab to protect resource from release
+ * @res: resource entry
+ */
+int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
+
+/**
+ * rdma_restrack_put() - release resource
+ * @res: resource entry
+ */
+int rdma_restrack_put(struct rdma_restrack_entry *res);
+
+/**
+ * rdma_restrack_set_task() - set the task for this resource
+ * @res: resource entry
+ * @task: task struct
+ */
+static inline void rdma_restrack_set_task(struct rdma_restrack_entry *res,
+ struct task_struct *task)
+{
+ if (res->task)
+ put_task_struct(res->task);
+ get_task_struct(task);
+ res->task = task;
+}
+
+/*
+ * Helper functions for rdma drivers when filling out
+ * nldev driver attributes.
+ */
+int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
+int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
+ u32 value);
+int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
+int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
+ u64 value);
+#endif /* _RDMA_RESTRACK_H_ */