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
|
/* Copyright (C) 2014 Timo Dritschler <timo.dritschler@kit.edu>
(Karlsruhe Institute of Technology)
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef __KIRO_RDMA_H__
#define __KIRO_RDMA_H__
#include <rdma/rdma_cma.h>
struct kiro_connection_context {
// Information and necessary structurs
uint32_t identifier; // Unique Identifier for this connection (Application Specific)
struct kiro_rdma_mem *cf_mr_recv; // Control-Flow Memory Region Receive
struct kiro_rdma_mem *cf_mr_send; // Control-Flow Memory Region Send
struct kiro_rdma_mem *rdma_mr; // Memory Region for RDMA Operations
struct ibv_mr peer_mr; // RDMA Memory Region Information of the peer
enum {
KIRO_IDLE,
KIRO_MRI_REQUESTED, // Memory Region Information Requested
KIRO_RDMA_ESTABLISHED, // MRI Exchange complete. RDMA is ready
KIRO_RDMA_ACTIVE // RDMA Operation is being performed
} rdma_state;
};
struct kiro_connection {
uint32_t identifier;
struct rdma_cm_id *id;
struct kiro_connection *next;
};
struct kiro_ctrl_msg {
enum {
KIRO_REQ_RDMA, // Requesting RDMA Access to/from the peer
KIRO_ACK_RDMA, // acknowledge RDMA Request and provide Memory Region Information
KIRO_REJ_RDMA // RDMA Request rejected :( (peer_mri will be invalid)
} msg_type;
struct ibv_mr peer_mri;
};
struct kiro_rdma_mem {
void *mem; // Pointer to the beginning of the memory block
struct ibv_mr *mr; // Memory Region associated with the memory
size_t size; // Size in Bytes of the memory block
};
static int kiro_attach_qp (struct rdma_cm_id *id)
{
if(!id)
return -1;
id->pd = ibv_alloc_pd(id->verbs);
id->send_cq_channel = ibv_create_comp_channel(id->verbs);
id->recv_cq_channel = id->send_cq_channel; //we use one shared completion channel
id->send_cq = ibv_create_cq(id->verbs, 1, id, id->send_cq_channel, 0);
id->recv_cq = id->send_cq; //we use one shared completion queue
struct ibv_qp_init_attr qp_attr;
memset(&qp_attr, 0, sizeof(struct ibv_qp_init_attr));
qp_attr.qp_context = (uintptr_t)id;
qp_attr.send_cq = id->send_cq;
qp_attr.recv_cq = id->recv_cq;
qp_attr.qp_type = IBV_QPT_RC;
qp_attr.cap.max_send_wr = 1;
qp_attr.cap.max_recv_wr = 1;
qp_attr.cap.max_send_sge = 1;
qp_attr.cap.max_recv_sge = 1;
return rdma_create_qp(id, id->pd, &qp_attr);
}
static int kiro_register_rdma_memory (struct ibv_pd *pd, struct ibv_mr **mr, void *mem, size_t mem_size, int access)
{
if(mem_size == 0)
{
printf("Cant allocate memory of size '0'.\n");
return -1;
}
void *mem_handle = mem;
if(!mem_handle)
mem_handle = malloc(mem_size);
if(!mem_handle)
{
printf("Failed to allocate memory [Register Memory].");
return -1;
}
*mr = ibv_reg_mr(pd, mem_handle, mem_size, access);
if(!(*mr))
{
// Memory Registration failed
printf("Failed to register memory region!\n");
free(mem_handle);
return -1;
}
return 0;
}
static struct kiro_rdma_mem* kiro_create_rdma_memory (struct ibv_pd *pd, size_t mem_size, int access)
{
if(mem_size == 0)
{
printf("Cant allocate memory of size '0'.\n");
return NULL;
}
struct kiro_rdma_mem *krm = (struct kiro_rdma_mem *)calloc(1, sizeof(struct kiro_rdma_mem));
if(!krm)
{
printf("Failed to create new KIRO RDMA Memory.\n");
return NULL;
}
if(kiro_register_rdma_memory(pd, &(krm->mr), krm->mem, mem_size, access))
{
free(krm);
return NULL;
}
if(!krm->mem)
krm->mem = krm->mr->addr;
return krm;
}
static void kiro_destroy_rdma_memory (struct kiro_rdma_mem *krm)
{
if(!krm)
return;
if(krm->mr)
ibv_dereg_mr(krm->mr);
if(krm->mem)
free(krm->mem);
free(krm);
krm = NULL;
}
static void kiro_destroy_connection_context (struct kiro_connection_context **ctx)
{
if(!ctx)
return;
if(!(*ctx))
return;
if((*ctx)->cf_mr_recv)
kiro_destroy_rdma_memory((*ctx)->cf_mr_recv);
if((*ctx)->cf_mr_send)
kiro_destroy_rdma_memory((*ctx)->cf_mr_send);
//The RDMA-Memory Region normally contains allocated memory from the USER that has
//just been 'registered' for RDMA. DON'T free it! Just deregister it. The user is
//responsible for freeing this memory.
if((*ctx)->rdma_mr)
{
if((*ctx)->rdma_mr->mr)
ibv_dereg_mr((*ctx)->rdma_mr->mr);
free((*ctx)->rdma_mr);
(*ctx)->rdma_mr = NULL;
}
free(*ctx);
*ctx = NULL;
}
static void kiro_destroy_connection (struct rdma_cm_id **conn)
{
if(!(*conn))
return;
rdma_disconnect(*conn);
struct kiro_connection_context *ctx = (struct kiro_connection_context *)((*conn)->context);
if(ctx)
kiro_destroy_connection_context(&ctx);
rdma_destroy_ep(*conn);
*conn = NULL;
}
#endif //__KIRO_RDMA_H__
|
