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
|
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2024 Oracle. All rights reserved.
*/
/* #include <linux/module.h>
#include <linux/slab.h> */
#include <linux/xarray.h>
#include <linux/types.h>
#include <linux/kref.h>
#include <linux/completion.h>
#include <linux/sunrpc/svc_rdma.h>
#include <linux/sunrpc/rdma_rn.h>
#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>
/* Per-ib_device private data for rpcrdma */
struct rpcrdma_device {
struct kref rd_kref;
unsigned long rd_flags;
struct ib_device *rd_device;
struct xarray rd_xa;
struct completion rd_done;
};
#define RPCRDMA_RD_F_REMOVING (0)
static struct ib_client rpcrdma_ib_client;
/*
* Listeners have no associated device, so we never register them.
* Note that ib_get_client_data() does not check if @device is
* NULL for us.
*/
static struct rpcrdma_device *rpcrdma_get_client_data(struct ib_device *device)
{
if (!device)
return NULL;
return ib_get_client_data(device, &rpcrdma_ib_client);
}
/**
* rpcrdma_rn_register - register to get device removal notifications
* @device: device to monitor
* @rn: notification object that wishes to be notified
* @done: callback to notify caller of device removal
*
* Returns zero on success. The callback in rn_done is guaranteed
* to be invoked when the device is removed, unless this notification
* is unregistered first.
*
* On failure, a negative errno is returned.
*/
int rpcrdma_rn_register(struct ib_device *device,
struct rpcrdma_notification *rn,
void (*done)(struct rpcrdma_notification *rn))
{
struct rpcrdma_device *rd = rpcrdma_get_client_data(device);
if (!rd || test_bit(RPCRDMA_RD_F_REMOVING, &rd->rd_flags))
return -ENETUNREACH;
kref_get(&rd->rd_kref);
if (xa_alloc(&rd->rd_xa, &rn->rn_index, rn, xa_limit_32b, GFP_KERNEL) < 0)
return -ENOMEM;
rn->rn_done = done;
return 0;
}
static void rpcrdma_rn_release(struct kref *kref)
{
struct rpcrdma_device *rd = container_of(kref, struct rpcrdma_device,
rd_kref);
trace_rpcrdma_client_completion(rd->rd_device);
complete(&rd->rd_done);
}
/**
* rpcrdma_rn_unregister - stop device removal notifications
* @device: monitored device
* @rn: notification object that no longer wishes to be notified
*/
void rpcrdma_rn_unregister(struct ib_device *device,
struct rpcrdma_notification *rn)
{
struct rpcrdma_device *rd = rpcrdma_get_client_data(device);
if (!rd)
return;
xa_erase(&rd->rd_xa, rn->rn_index);
kref_put(&rd->rd_kref, rpcrdma_rn_release);
}
/**
* rpcrdma_add_one - ib_client device insertion callback
* @device: device about to be inserted
*
* Returns zero on success. xprtrdma private data has been allocated
* for this device. On failure, a negative errno is returned.
*/
static int rpcrdma_add_one(struct ib_device *device)
{
struct rpcrdma_device *rd;
rd = kzalloc(sizeof(*rd), GFP_KERNEL);
if (!rd)
return -ENOMEM;
kref_init(&rd->rd_kref);
xa_init_flags(&rd->rd_xa, XA_FLAGS_ALLOC1);
rd->rd_device = device;
init_completion(&rd->rd_done);
ib_set_client_data(device, &rpcrdma_ib_client, rd);
trace_rpcrdma_client_add_one(device);
return 0;
}
/**
* rpcrdma_remove_one - ib_client device removal callback
* @device: device about to be removed
* @client_data: this module's private per-device data
*
* Upon return, all transports associated with @device have divested
* themselves from IB hardware resources.
*/
static void rpcrdma_remove_one(struct ib_device *device,
void *client_data)
{
struct rpcrdma_device *rd = client_data;
struct rpcrdma_notification *rn;
unsigned long index;
trace_rpcrdma_client_remove_one(device);
set_bit(RPCRDMA_RD_F_REMOVING, &rd->rd_flags);
xa_for_each(&rd->rd_xa, index, rn)
rn->rn_done(rn);
/*
* Wait only if there are still outstanding notification
* registrants for this device.
*/
if (!refcount_dec_and_test(&rd->rd_kref.refcount)) {
trace_rpcrdma_client_wait_on(device);
wait_for_completion(&rd->rd_done);
}
trace_rpcrdma_client_remove_one_done(device);
kfree(rd);
}
static struct ib_client rpcrdma_ib_client = {
.name = "rpcrdma",
.add = rpcrdma_add_one,
.remove = rpcrdma_remove_one,
};
/**
* rpcrdma_ib_client_unregister - unregister ib_client for xprtrdma
*
* cel: watch for orphaned rpcrdma_device objects on module unload
*/
void rpcrdma_ib_client_unregister(void)
{
ib_unregister_client(&rpcrdma_ib_client);
}
/**
* rpcrdma_ib_client_register - register ib_client for rpcrdma
*
* Returns zero on success, or a negative errno.
*/
int rpcrdma_ib_client_register(void)
{
return ib_register_client(&rpcrdma_ib_client);
}
|
