1 /*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33 #include <linux/kernel.h>
34 #include <linux/in.h>
35 #include <linux/if.h>
36 #include <linux/netdevice.h>
37 #include <linux/inetdevice.h>
38 #include <linux/if_arp.h>
39 #include <linux/delay.h>
40
41 #include "rds.h"
42 #include "ib.h"
43
44 unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
45 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
46
47 module_param(fmr_pool_size, int, 0444);
48 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
49 module_param(fmr_message_size, int, 0444);
50 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
51
52 struct list_head rds_ib_devices;
53
54 /* NOTE: if also grabbing ibdev lock, grab this first */
55 DEFINE_SPINLOCK(ib_nodev_conns_lock);
56 LIST_HEAD(ib_nodev_conns);
57
58 void rds_ib_add_one(struct ib_device *device)
59 {
60 struct rds_ib_device *rds_ibdev;
61 struct ib_device_attr *dev_attr;
62
63 /* Only handle IB (no iWARP) devices */
64 if (device->node_type != RDMA_NODE_IB_CA)
65 return;
66
67 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
68 if (!dev_attr)
69 return;
70
71 if (ib_query_device(device, dev_attr)) {
72 rdsdebug("Query device failed for %s\n", device->name);
73 goto free_attr;
74 }
75
76 rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
77 if (!rds_ibdev)
78 goto free_attr;
79
80 spin_lock_init(&rds_ibdev->spinlock);
81
82 rds_ibdev->max_wrs = dev_attr->max_qp_wr;
83 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
84
85 rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
86 rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift;
87 rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1);
88 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
89 rds_ibdev->max_fmrs = dev_attr->max_fmr ?
90 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
91 fmr_pool_size;
92
93 rds_ibdev->dev = device;
94 rds_ibdev->pd = ib_alloc_pd(device);
95 if (IS_ERR(rds_ibdev->pd))
96 goto free_dev;
97
98 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
99 IB_ACCESS_LOCAL_WRITE);
100 if (IS_ERR(rds_ibdev->mr))
101 goto err_pd;
102
103 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
104 if (IS_ERR(rds_ibdev->mr_pool)) {
105 rds_ibdev->mr_pool = NULL;
106 goto err_mr;
107 }
108
109 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
110 INIT_LIST_HEAD(&rds_ibdev->conn_list);
111 list_add_tail(&rds_ibdev->list, &rds_ib_devices);
112
113 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
114
115 goto free_attr;
116
117 err_mr:
118 ib_dereg_mr(rds_ibdev->mr);
119 err_pd:
120 ib_dealloc_pd(rds_ibdev->pd);
121 free_dev:
122 kfree(rds_ibdev);
123 free_attr:
124 kfree(dev_attr);
125 }
126
127 void rds_ib_remove_one(struct ib_device *device)
128 {
129 struct rds_ib_device *rds_ibdev;
130 struct rds_ib_ipaddr *i_ipaddr, *i_next;
131
132 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
133 if (!rds_ibdev)
134 return;
135
136 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
137 list_del(&i_ipaddr->list);
138 kfree(i_ipaddr);
139 }
140
141 rds_ib_destroy_conns(rds_ibdev);
142
143 if (rds_ibdev->mr_pool)
144 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
145
146 ib_dereg_mr(rds_ibdev->mr);
147
148 while (ib_dealloc_pd(rds_ibdev->pd)) {
149 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
150 msleep(1);
151 }
152
153 list_del(&rds_ibdev->list);
154 kfree(rds_ibdev);
155 }
156
157 struct ib_client rds_ib_client = {
158 .name = "rds_ib",
159 .add = rds_ib_add_one,
160 .remove = rds_ib_remove_one
161 };
162
163 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
164 void *buffer)
165 {
166 struct rds_info_rdma_connection *iinfo = buffer;
167 struct rds_ib_connection *ic;
168
169 /* We will only ever look at IB transports */
170 if (conn->c_trans != &rds_ib_transport)
171 return 0;
172
173 iinfo->src_addr = conn->c_laddr;
174 iinfo->dst_addr = conn->c_faddr;
175
176 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
177 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
178 if (rds_conn_state(conn) == RDS_CONN_UP) {
179 struct rds_ib_device *rds_ibdev;
180 struct rdma_dev_addr *dev_addr;
181
182 ic = conn->c_transport_data;
183 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
184
185 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
186 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
187
188 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
189 iinfo->max_send_wr = ic->i_send_ring.w_nr;
190 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
191 iinfo->max_send_sge = rds_ibdev->max_sge;
192 rds_ib_get_mr_info(rds_ibdev, iinfo);
193 }
194 return 1;
195 }
196
197 static void rds_ib_ic_info(struct socket *sock, unsigned int len,
198 struct rds_info_iterator *iter,
199 struct rds_info_lengths *lens)
200 {
201 rds_for_each_conn_info(sock, len, iter, lens,
202 rds_ib_conn_info_visitor,
203 sizeof(struct rds_info_rdma_connection));
204 }
205
206
207 /*
208 * Early RDS/IB was built to only bind to an address if there is an IPoIB
209 * device with that address set.
210 *
211 * If it were me, I'd advocate for something more flexible. Sending and
212 * receiving should be device-agnostic. Transports would try and maintain
213 * connections between peers who have messages queued. Userspace would be
214 * allowed to influence which paths have priority. We could call userspace
215 * asserting this policy "routing".
216 */
217 static int rds_ib_laddr_check(__be32 addr)
218 {
219 int ret;
220 struct rdma_cm_id *cm_id;
221 struct sockaddr_in sin;
222
223 /* Create a CMA ID and try to bind it. This catches both
224 * IB and iWARP capable NICs.
225 */
226 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
227 if (IS_ERR(cm_id))
228 return PTR_ERR(cm_id);
229
230 memset(&sin, 0, sizeof(sin));
231 sin.sin_family = AF_INET;
232 sin.sin_addr.s_addr = addr;
233
234 /* rdma_bind_addr will only succeed for IB & iWARP devices */
235 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
236 /* due to this, we will claim to support iWARP devices unless we
237 check node_type. */
238 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
239 ret = -EADDRNOTAVAIL;
240
241 rdsdebug("addr %pI4 ret %d node type %d\n",
242 &addr, ret,
243 cm_id->device ? cm_id->device->node_type : -1);
244
245 rdma_destroy_id(cm_id);
246
247 return ret;
248 }
249
250 void rds_ib_exit(void)
251 {
252 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
253 rds_ib_destroy_nodev_conns();
254 ib_unregister_client(&rds_ib_client);
255 rds_ib_sysctl_exit();
256 rds_ib_recv_exit();
257 rds_trans_unregister(&rds_ib_transport);
258 }
259
260 struct rds_transport rds_ib_transport = {
261 .laddr_check = rds_ib_laddr_check,
262 .xmit_complete = rds_ib_xmit_complete,
263 .xmit = rds_ib_xmit,
264 .xmit_cong_map = NULL,
265 .xmit_rdma = rds_ib_xmit_rdma,
266 .recv = rds_ib_recv,
267 .conn_alloc = rds_ib_conn_alloc,
268 .conn_free = rds_ib_conn_free,
269 .conn_connect = rds_ib_conn_connect,
270 .conn_shutdown = rds_ib_conn_shutdown,
271 .inc_copy_to_user = rds_ib_inc_copy_to_user,
272 .inc_purge = rds_ib_inc_purge,
273 .inc_free = rds_ib_inc_free,
274 .cm_initiate_connect = rds_ib_cm_initiate_connect,
275 .cm_handle_connect = rds_ib_cm_handle_connect,
276 .cm_connect_complete = rds_ib_cm_connect_complete,
277 .stats_info_copy = rds_ib_stats_info_copy,
278 .exit = rds_ib_exit,
279 .get_mr = rds_ib_get_mr,
280 .sync_mr = rds_ib_sync_mr,
281 .free_mr = rds_ib_free_mr,
282 .flush_mrs = rds_ib_flush_mrs,
283 .t_owner = THIS_MODULE,
284 .t_name = "infiniband",
285 };
286
287 int __init rds_ib_init(void)
288 {
289 int ret;
290
291 INIT_LIST_HEAD(&rds_ib_devices);
292
293 ret = ib_register_client(&rds_ib_client);
294 if (ret)
295 goto out;
296
297 ret = rds_ib_sysctl_init();
298 if (ret)
299 goto out_ibreg;
300
301 ret = rds_ib_recv_init();
302 if (ret)
303 goto out_sysctl;
304
305 ret = rds_trans_register(&rds_ib_transport);
306 if (ret)
307 goto out_recv;
308
309 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
310
311 goto out;
312
313 out_recv:
314 rds_ib_recv_exit();
315 out_sysctl:
316 rds_ib_sysctl_exit();
317 out_ibreg:
318 ib_unregister_client(&rds_ib_client);
319 out:
320 return ret;
321 }
322
323 MODULE_LICENSE("GPL");
324
325
|
This page was automatically generated by the
LXR engine.
|