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 #include <linux/slab.h>
41 #include <linux/module.h>
42
43 #include "rds.h"
44 #include "iw.h"
45
46 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
47 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
48
49 module_param(fastreg_pool_size, int, 0444);
50 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
51 module_param(fastreg_message_size, int, 0444);
52 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
53
54 struct list_head rds_iw_devices;
55
56 /* NOTE: if also grabbing iwdev lock, grab this first */
57 DEFINE_SPINLOCK(iw_nodev_conns_lock);
58 LIST_HEAD(iw_nodev_conns);
59
rds_iw_add_one(struct ib_device * device)60 static void rds_iw_add_one(struct ib_device *device)
61 {
62 struct rds_iw_device *rds_iwdev;
63 struct ib_device_attr *dev_attr;
64
65 /* Only handle iwarp devices */
66 if (device->node_type != RDMA_NODE_RNIC)
67 return;
68
69 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
70 if (!dev_attr)
71 return;
72
73 if (ib_query_device(device, dev_attr)) {
74 rdsdebug("Query device failed for %s\n", device->name);
75 goto free_attr;
76 }
77
78 rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
79 if (!rds_iwdev)
80 goto free_attr;
81
82 spin_lock_init(&rds_iwdev->spinlock);
83
84 rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
85 rds_iwdev->max_wrs = dev_attr->max_qp_wr;
86 rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
87
88 rds_iwdev->dev = device;
89 rds_iwdev->pd = ib_alloc_pd(device);
90 if (IS_ERR(rds_iwdev->pd))
91 goto free_dev;
92
93 if (!rds_iwdev->dma_local_lkey) {
94 rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
95 IB_ACCESS_REMOTE_READ |
96 IB_ACCESS_REMOTE_WRITE |
97 IB_ACCESS_LOCAL_WRITE);
98 if (IS_ERR(rds_iwdev->mr))
99 goto err_pd;
100 } else
101 rds_iwdev->mr = NULL;
102
103 rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
104 if (IS_ERR(rds_iwdev->mr_pool)) {
105 rds_iwdev->mr_pool = NULL;
106 goto err_mr;
107 }
108
109 INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
110 INIT_LIST_HEAD(&rds_iwdev->conn_list);
111 list_add_tail(&rds_iwdev->list, &rds_iw_devices);
112
113 ib_set_client_data(device, &rds_iw_client, rds_iwdev);
114
115 goto free_attr;
116
117 err_mr:
118 if (rds_iwdev->mr)
119 ib_dereg_mr(rds_iwdev->mr);
120 err_pd:
121 ib_dealloc_pd(rds_iwdev->pd);
122 free_dev:
123 kfree(rds_iwdev);
124 free_attr:
125 kfree(dev_attr);
126 }
127
rds_iw_remove_one(struct ib_device * device,void * client_data)128 static void rds_iw_remove_one(struct ib_device *device, void *client_data)
129 {
130 struct rds_iw_device *rds_iwdev = client_data;
131 struct rds_iw_cm_id *i_cm_id, *next;
132
133 if (!rds_iwdev)
134 return;
135
136 spin_lock_irq(&rds_iwdev->spinlock);
137 list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
138 list_del(&i_cm_id->list);
139 kfree(i_cm_id);
140 }
141 spin_unlock_irq(&rds_iwdev->spinlock);
142
143 rds_iw_destroy_conns(rds_iwdev);
144
145 if (rds_iwdev->mr_pool)
146 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
147
148 if (rds_iwdev->mr)
149 ib_dereg_mr(rds_iwdev->mr);
150
151 ib_dealloc_pd(rds_iwdev->pd);
152
153 list_del(&rds_iwdev->list);
154 kfree(rds_iwdev);
155 }
156
157 struct ib_client rds_iw_client = {
158 .name = "rds_iw",
159 .add = rds_iw_add_one,
160 .remove = rds_iw_remove_one
161 };
162
rds_iw_conn_info_visitor(struct rds_connection * conn,void * buffer)163 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
164 void *buffer)
165 {
166 struct rds_info_rdma_connection *iinfo = buffer;
167 struct rds_iw_connection *ic;
168
169 /* We will only ever look at IB transports */
170 if (conn->c_trans != &rds_iw_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_iw_device *rds_iwdev;
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 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
186 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
187
188 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_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_iwdev->max_sge;
192 rds_iw_get_mr_info(rds_iwdev, iinfo);
193 }
194 return 1;
195 }
196
rds_iw_ic_info(struct socket * sock,unsigned int len,struct rds_info_iterator * iter,struct rds_info_lengths * lens)197 static void rds_iw_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_iw_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 */
rds_iw_laddr_check(struct net * net,__be32 addr)217 static int rds_iw_laddr_check(struct net *net, __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(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
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 IB devices unless we
237 check node_type. */
238 if (ret || !cm_id->device ||
239 cm_id->device->node_type != RDMA_NODE_RNIC)
240 ret = -EADDRNOTAVAIL;
241
242 rdsdebug("addr %pI4 ret %d node type %d\n",
243 &addr, ret,
244 cm_id->device ? cm_id->device->node_type : -1);
245
246 rdma_destroy_id(cm_id);
247
248 return ret;
249 }
250
rds_iw_exit(void)251 void rds_iw_exit(void)
252 {
253 rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
254 rds_iw_destroy_nodev_conns();
255 ib_unregister_client(&rds_iw_client);
256 rds_iw_sysctl_exit();
257 rds_iw_recv_exit();
258 rds_trans_unregister(&rds_iw_transport);
259 }
260
261 struct rds_transport rds_iw_transport = {
262 .laddr_check = rds_iw_laddr_check,
263 .xmit_complete = rds_iw_xmit_complete,
264 .xmit = rds_iw_xmit,
265 .xmit_rdma = rds_iw_xmit_rdma,
266 .recv = rds_iw_recv,
267 .conn_alloc = rds_iw_conn_alloc,
268 .conn_free = rds_iw_conn_free,
269 .conn_connect = rds_iw_conn_connect,
270 .conn_shutdown = rds_iw_conn_shutdown,
271 .inc_copy_to_user = rds_iw_inc_copy_to_user,
272 .inc_free = rds_iw_inc_free,
273 .cm_initiate_connect = rds_iw_cm_initiate_connect,
274 .cm_handle_connect = rds_iw_cm_handle_connect,
275 .cm_connect_complete = rds_iw_cm_connect_complete,
276 .stats_info_copy = rds_iw_stats_info_copy,
277 .exit = rds_iw_exit,
278 .get_mr = rds_iw_get_mr,
279 .sync_mr = rds_iw_sync_mr,
280 .free_mr = rds_iw_free_mr,
281 .flush_mrs = rds_iw_flush_mrs,
282 .t_owner = THIS_MODULE,
283 .t_name = "iwarp",
284 .t_type = RDS_TRANS_IWARP,
285 .t_prefer_loopback = 1,
286 };
287
rds_iw_init(void)288 int rds_iw_init(void)
289 {
290 int ret;
291
292 INIT_LIST_HEAD(&rds_iw_devices);
293
294 ret = ib_register_client(&rds_iw_client);
295 if (ret)
296 goto out;
297
298 ret = rds_iw_sysctl_init();
299 if (ret)
300 goto out_ibreg;
301
302 ret = rds_iw_recv_init();
303 if (ret)
304 goto out_sysctl;
305
306 ret = rds_trans_register(&rds_iw_transport);
307 if (ret)
308 goto out_recv;
309
310 rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
311
312 goto out;
313
314 out_recv:
315 rds_iw_recv_exit();
316 out_sysctl:
317 rds_iw_sysctl_exit();
318 out_ibreg:
319 ib_unregister_client(&rds_iw_client);
320 out:
321 return ret;
322 }
323
324 MODULE_LICENSE("GPL");
325
326