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iw.c
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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 
47 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
48 
50 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
52 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
53 
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 
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,
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 
128 static void rds_iw_remove_one(struct ib_device *device)
129 {
130  struct rds_iw_device *rds_iwdev;
131  struct rds_iw_cm_id *i_cm_id, *next;
132 
133  rds_iwdev = ib_get_client_data(device, &rds_iw_client);
134  if (!rds_iwdev)
135  return;
136 
137  spin_lock_irq(&rds_iwdev->spinlock);
138  list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
139  list_del(&i_cm_id->list);
140  kfree(i_cm_id);
141  }
142  spin_unlock_irq(&rds_iwdev->spinlock);
143 
144  rds_iw_destroy_conns(rds_iwdev);
145 
146  if (rds_iwdev->mr_pool)
147  rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
148 
149  if (rds_iwdev->mr)
150  ib_dereg_mr(rds_iwdev->mr);
151 
152  while (ib_dealloc_pd(rds_iwdev->pd)) {
153  rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
154  msleep(1);
155  }
156 
157  list_del(&rds_iwdev->list);
158  kfree(rds_iwdev);
159 }
160 
162  .name = "rds_iw",
163  .add = rds_iw_add_one,
164  .remove = rds_iw_remove_one
165 };
166 
167 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
168  void *buffer)
169 {
170  struct rds_info_rdma_connection *iinfo = buffer;
171  struct rds_iw_connection *ic;
172 
173  /* We will only ever look at IB transports */
174  if (conn->c_trans != &rds_iw_transport)
175  return 0;
176 
177  iinfo->src_addr = conn->c_laddr;
178  iinfo->dst_addr = conn->c_faddr;
179 
180  memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
181  memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
182  if (rds_conn_state(conn) == RDS_CONN_UP) {
183  struct rds_iw_device *rds_iwdev;
184  struct rdma_dev_addr *dev_addr;
185 
186  ic = conn->c_transport_data;
187  dev_addr = &ic->i_cm_id->route.addr.dev_addr;
188 
189  rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
190  rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
191 
192  rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
193  iinfo->max_send_wr = ic->i_send_ring.w_nr;
194  iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
195  iinfo->max_send_sge = rds_iwdev->max_sge;
196  rds_iw_get_mr_info(rds_iwdev, iinfo);
197  }
198  return 1;
199 }
200 
201 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
202  struct rds_info_iterator *iter,
203  struct rds_info_lengths *lens)
204 {
205  rds_for_each_conn_info(sock, len, iter, lens,
206  rds_iw_conn_info_visitor,
207  sizeof(struct rds_info_rdma_connection));
208 }
209 
210 
211 /*
212  * Early RDS/IB was built to only bind to an address if there is an IPoIB
213  * device with that address set.
214  *
215  * If it were me, I'd advocate for something more flexible. Sending and
216  * receiving should be device-agnostic. Transports would try and maintain
217  * connections between peers who have messages queued. Userspace would be
218  * allowed to influence which paths have priority. We could call userspace
219  * asserting this policy "routing".
220  */
221 static int rds_iw_laddr_check(__be32 addr)
222 {
223  int ret;
224  struct rdma_cm_id *cm_id;
225  struct sockaddr_in sin;
226 
227  /* Create a CMA ID and try to bind it. This catches both
228  * IB and iWARP capable NICs.
229  */
231  if (IS_ERR(cm_id))
232  return PTR_ERR(cm_id);
233 
234  memset(&sin, 0, sizeof(sin));
235  sin.sin_family = AF_INET;
236  sin.sin_addr.s_addr = addr;
237 
238  /* rdma_bind_addr will only succeed for IB & iWARP devices */
239  ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
240  /* due to this, we will claim to support IB devices unless we
241  check node_type. */
242  if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
243  ret = -EADDRNOTAVAIL;
244 
245  rdsdebug("addr %pI4 ret %d node type %d\n",
246  &addr, ret,
247  cm_id->device ? cm_id->device->node_type : -1);
248 
249  rdma_destroy_id(cm_id);
250 
251  return ret;
252 }
253 
254 void rds_iw_exit(void)
255 {
257  rds_iw_destroy_nodev_conns();
258  ib_unregister_client(&rds_iw_client);
262 }
263 
265  .laddr_check = rds_iw_laddr_check,
266  .xmit_complete = rds_iw_xmit_complete,
267  .xmit = rds_iw_xmit,
268  .xmit_rdma = rds_iw_xmit_rdma,
269  .recv = rds_iw_recv,
270  .conn_alloc = rds_iw_conn_alloc,
271  .conn_free = rds_iw_conn_free,
272  .conn_connect = rds_iw_conn_connect,
273  .conn_shutdown = rds_iw_conn_shutdown,
274  .inc_copy_to_user = rds_iw_inc_copy_to_user,
275  .inc_free = rds_iw_inc_free,
276  .cm_initiate_connect = rds_iw_cm_initiate_connect,
277  .cm_handle_connect = rds_iw_cm_handle_connect,
278  .cm_connect_complete = rds_iw_cm_connect_complete,
279  .stats_info_copy = rds_iw_stats_info_copy,
280  .exit = rds_iw_exit,
281  .get_mr = rds_iw_get_mr,
282  .sync_mr = rds_iw_sync_mr,
283  .free_mr = rds_iw_free_mr,
284  .flush_mrs = rds_iw_flush_mrs,
285  .t_owner = THIS_MODULE,
286  .t_name = "iwarp",
287  .t_type = RDS_TRANS_IWARP,
288  .t_prefer_loopback = 1,
289 };
290 
291 int rds_iw_init(void)
292 {
293  int ret;
294 
295  INIT_LIST_HEAD(&rds_iw_devices);
296 
297  ret = ib_register_client(&rds_iw_client);
298  if (ret)
299  goto out;
300 
301  ret = rds_iw_sysctl_init();
302  if (ret)
303  goto out_ibreg;
304 
305  ret = rds_iw_recv_init();
306  if (ret)
307  goto out_sysctl;
308 
309  ret = rds_trans_register(&rds_iw_transport);
310  if (ret)
311  goto out_recv;
312 
314 
315  goto out;
316 
317 out_recv:
319 out_sysctl:
321 out_ibreg:
322  ib_unregister_client(&rds_iw_client);
323 out:
324  return ret;
325 }
326 
327 MODULE_LICENSE("GPL");
328