summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/sw/rxe/rxe_pool.c
blob: 67567d62195e865023ad71dfde58bf078958e617 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
 */

#include "rxe.h"

#define RXE_POOL_TIMEOUT	(200)
#define RXE_POOL_ALIGN		(16)

static const struct rxe_type_info {
	const char *name;
	size_t size;
	size_t elem_offset;
	void (*cleanup)(struct rxe_pool_elem *elem);
	u32 min_index;
	u32 max_index;
	u32 max_elem;
} rxe_type_info[RXE_NUM_TYPES] = {
	[RXE_TYPE_UC] = {
		.name		= "uc",
		.size		= sizeof(struct rxe_ucontext),
		.elem_offset	= offsetof(struct rxe_ucontext, elem),
		.min_index	= 1,
		.max_index	= RXE_MAX_UCONTEXT,
		.max_elem	= RXE_MAX_UCONTEXT,
	},
	[RXE_TYPE_PD] = {
		.name		= "pd",
		.size		= sizeof(struct rxe_pd),
		.elem_offset	= offsetof(struct rxe_pd, elem),
		.min_index	= 1,
		.max_index	= RXE_MAX_PD,
		.max_elem	= RXE_MAX_PD,
	},
	[RXE_TYPE_AH] = {
		.name		= "ah",
		.size		= sizeof(struct rxe_ah),
		.elem_offset	= offsetof(struct rxe_ah, elem),
		.min_index	= RXE_MIN_AH_INDEX,
		.max_index	= RXE_MAX_AH_INDEX,
		.max_elem	= RXE_MAX_AH,
	},
	[RXE_TYPE_SRQ] = {
		.name		= "srq",
		.size		= sizeof(struct rxe_srq),
		.elem_offset	= offsetof(struct rxe_srq, elem),
		.cleanup	= rxe_srq_cleanup,
		.min_index	= RXE_MIN_SRQ_INDEX,
		.max_index	= RXE_MAX_SRQ_INDEX,
		.max_elem	= RXE_MAX_SRQ,
	},
	[RXE_TYPE_QP] = {
		.name		= "qp",
		.size		= sizeof(struct rxe_qp),
		.elem_offset	= offsetof(struct rxe_qp, elem),
		.cleanup	= rxe_qp_cleanup,
		.min_index	= RXE_MIN_QP_INDEX,
		.max_index	= RXE_MAX_QP_INDEX,
		.max_elem	= RXE_MAX_QP,
	},
	[RXE_TYPE_CQ] = {
		.name		= "cq",
		.size		= sizeof(struct rxe_cq),
		.elem_offset	= offsetof(struct rxe_cq, elem),
		.cleanup	= rxe_cq_cleanup,
		.min_index	= 1,
		.max_index	= RXE_MAX_CQ,
		.max_elem	= RXE_MAX_CQ,
	},
	[RXE_TYPE_MR] = {
		.name		= "mr",
		.size		= sizeof(struct rxe_mr),
		.elem_offset	= offsetof(struct rxe_mr, elem),
		.cleanup	= rxe_mr_cleanup,
		.min_index	= RXE_MIN_MR_INDEX,
		.max_index	= RXE_MAX_MR_INDEX,
		.max_elem	= RXE_MAX_MR,
	},
	[RXE_TYPE_MW] = {
		.name		= "mw",
		.size		= sizeof(struct rxe_mw),
		.elem_offset	= offsetof(struct rxe_mw, elem),
		.cleanup	= rxe_mw_cleanup,
		.min_index	= RXE_MIN_MW_INDEX,
		.max_index	= RXE_MAX_MW_INDEX,
		.max_elem	= RXE_MAX_MW,
	},
};

void rxe_pool_init(struct rxe_dev *rxe, struct rxe_pool *pool,
		   enum rxe_elem_type type)
{
	const struct rxe_type_info *info = &rxe_type_info[type];

	memset(pool, 0, sizeof(*pool));

	pool->rxe		= rxe;
	pool->name		= info->name;
	pool->type		= type;
	pool->max_elem		= info->max_elem;
	pool->elem_size		= ALIGN(info->size, RXE_POOL_ALIGN);
	pool->elem_offset	= info->elem_offset;
	pool->cleanup		= info->cleanup;

	atomic_set(&pool->num_elem, 0);

	xa_init_flags(&pool->xa, XA_FLAGS_ALLOC);
	pool->limit.min = info->min_index;
	pool->limit.max = info->max_index;
}

void rxe_pool_cleanup(struct rxe_pool *pool)
{
	WARN_ON(!xa_empty(&pool->xa));
}

int __rxe_add_to_pool(struct rxe_pool *pool, struct rxe_pool_elem *elem,
				bool sleepable)
{
	int err = -EINVAL;
	gfp_t gfp_flags;

	if (atomic_inc_return(&pool->num_elem) > pool->max_elem)
		goto err_cnt;

	elem->pool = pool;
	elem->obj = (u8 *)elem - pool->elem_offset;
	kref_init(&elem->ref_cnt);
	init_completion(&elem->complete);

	/* AH objects are unique in that the create_ah verb
	 * can be called in atomic context. If the create_ah
	 * call is not sleepable use GFP_ATOMIC.
	 */
	gfp_flags = sleepable ? GFP_KERNEL : GFP_ATOMIC;

	if (sleepable)
		might_sleep();
	err = xa_alloc_cyclic(&pool->xa, &elem->index, NULL, pool->limit,
			      &pool->next, gfp_flags);
	if (err < 0)
		goto err_cnt;

	return 0;

err_cnt:
	atomic_dec(&pool->num_elem);
	return err;
}

void *rxe_pool_get_index(struct rxe_pool *pool, u32 index)
{
	struct rxe_pool_elem *elem;
	struct xarray *xa = &pool->xa;
	void *obj;

	rcu_read_lock();
	elem = xa_load(xa, index);
	if (elem && kref_get_unless_zero(&elem->ref_cnt))
		obj = elem->obj;
	else
		obj = NULL;
	rcu_read_unlock();

	return obj;
}

static void rxe_elem_release(struct kref *kref)
{
	struct rxe_pool_elem *elem = container_of(kref, typeof(*elem), ref_cnt);

	complete(&elem->complete);
}

int __rxe_cleanup(struct rxe_pool_elem *elem, bool sleepable)
{
	struct rxe_pool *pool = elem->pool;
	struct xarray *xa = &pool->xa;
	static int timeout = RXE_POOL_TIMEOUT;
	int ret, err = 0;
	void *xa_ret;

	if (sleepable)
		might_sleep();

	/* erase xarray entry to prevent looking up
	 * the pool elem from its index
	 */
	xa_ret = xa_erase(xa, elem->index);
	WARN_ON(xa_err(xa_ret));

	/* if this is the last call to rxe_put complete the
	 * object. It is safe to touch obj->elem after this since
	 * it is freed below
	 */
	__rxe_put(elem);

	/* wait until all references to the object have been
	 * dropped before final object specific cleanup and
	 * return to rdma-core
	 */
	if (sleepable) {
		if (!completion_done(&elem->complete) && timeout) {
			ret = wait_for_completion_timeout(&elem->complete,
					timeout);

			/* Shouldn't happen. There are still references to
			 * the object but, rather than deadlock, free the
			 * object or pass back to rdma-core.
			 */
			if (WARN_ON(!ret))
				err = -EINVAL;
		}
	} else {
		unsigned long until = jiffies + timeout;

		/* AH objects are unique in that the destroy_ah verb
		 * can be called in atomic context. This delay
		 * replaces the wait_for_completion call above
		 * when the destroy_ah call is not sleepable
		 */
		while (!completion_done(&elem->complete) &&
				time_before(jiffies, until))
			mdelay(1);

		if (WARN_ON(!completion_done(&elem->complete)))
			err = -EINVAL;
	}

	if (pool->cleanup)
		pool->cleanup(elem);

	atomic_dec(&pool->num_elem);

	return err;
}

int __rxe_get(struct rxe_pool_elem *elem)
{
	return kref_get_unless_zero(&elem->ref_cnt);
}

int __rxe_put(struct rxe_pool_elem *elem)
{
	return kref_put(&elem->ref_cnt, rxe_elem_release);
}

void __rxe_finalize(struct rxe_pool_elem *elem)
{
	void *xa_ret;

	xa_ret = xa_store(&elem->pool->xa, elem->index, elem, GFP_KERNEL);
	WARN_ON(xa_err(xa_ret));
}