blob: db224f7c2937115612f5b572725035951da56aca [file] [log] [blame]
Andy Groverfcd8b7c2009-02-24 15:30:36 +00001/*
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 "iw.h"
43
44unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
45unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
46
47module_param(fastreg_pool_size, int, 0444);
48MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
49module_param(fastreg_message_size, int, 0444);
50MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
51
52struct list_head rds_iw_devices;
53
Andy Grover745cbcc2009-04-01 08:20:19 +000054/* NOTE: if also grabbing iwdev lock, grab this first */
Andy Groverfcd8b7c2009-02-24 15:30:36 +000055DEFINE_SPINLOCK(iw_nodev_conns_lock);
56LIST_HEAD(iw_nodev_conns);
57
58void rds_iw_add_one(struct ib_device *device)
59{
60 struct rds_iw_device *rds_iwdev;
61 struct ib_device_attr *dev_attr;
62
63 /* Only handle iwarp devices */
64 if (device->node_type != RDMA_NODE_RNIC)
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_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
77 if (!rds_iwdev)
78 goto free_attr;
79
80 spin_lock_init(&rds_iwdev->spinlock);
81
82 rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
83 rds_iwdev->max_wrs = dev_attr->max_qp_wr;
84 rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
85
Andy Groverfcd8b7c2009-02-24 15:30:36 +000086 rds_iwdev->dev = device;
87 rds_iwdev->pd = ib_alloc_pd(device);
88 if (IS_ERR(rds_iwdev->pd))
89 goto free_dev;
90
91 if (!rds_iwdev->dma_local_lkey) {
Andy Grovered9e3522009-07-17 13:13:35 +000092 rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
93 IB_ACCESS_REMOTE_READ |
94 IB_ACCESS_REMOTE_WRITE |
95 IB_ACCESS_LOCAL_WRITE);
Andy Groverfcd8b7c2009-02-24 15:30:36 +000096 if (IS_ERR(rds_iwdev->mr))
97 goto err_pd;
98 } else
99 rds_iwdev->mr = NULL;
100
101 rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
102 if (IS_ERR(rds_iwdev->mr_pool)) {
103 rds_iwdev->mr_pool = NULL;
104 goto err_mr;
105 }
106
107 INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
108 INIT_LIST_HEAD(&rds_iwdev->conn_list);
109 list_add_tail(&rds_iwdev->list, &rds_iw_devices);
110
111 ib_set_client_data(device, &rds_iw_client, rds_iwdev);
112
113 goto free_attr;
114
115err_mr:
116 if (rds_iwdev->mr)
117 ib_dereg_mr(rds_iwdev->mr);
118err_pd:
119 ib_dealloc_pd(rds_iwdev->pd);
120free_dev:
121 kfree(rds_iwdev);
122free_attr:
123 kfree(dev_attr);
124}
125
126void rds_iw_remove_one(struct ib_device *device)
127{
128 struct rds_iw_device *rds_iwdev;
129 struct rds_iw_cm_id *i_cm_id, *next;
130
131 rds_iwdev = ib_get_client_data(device, &rds_iw_client);
132 if (!rds_iwdev)
133 return;
134
135 spin_lock_irq(&rds_iwdev->spinlock);
136 list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
137 list_del(&i_cm_id->list);
138 kfree(i_cm_id);
139 }
140 spin_unlock_irq(&rds_iwdev->spinlock);
141
Andy Grover745cbcc2009-04-01 08:20:19 +0000142 rds_iw_destroy_conns(rds_iwdev);
Andy Groverfcd8b7c2009-02-24 15:30:36 +0000143
144 if (rds_iwdev->mr_pool)
145 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
146
147 if (rds_iwdev->mr)
148 ib_dereg_mr(rds_iwdev->mr);
149
150 while (ib_dealloc_pd(rds_iwdev->pd)) {
151 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
152 msleep(1);
153 }
154
155 list_del(&rds_iwdev->list);
156 kfree(rds_iwdev);
157}
158
159struct ib_client rds_iw_client = {
160 .name = "rds_iw",
161 .add = rds_iw_add_one,
162 .remove = rds_iw_remove_one
163};
164
165static int rds_iw_conn_info_visitor(struct rds_connection *conn,
166 void *buffer)
167{
168 struct rds_info_rdma_connection *iinfo = buffer;
169 struct rds_iw_connection *ic;
170
171 /* We will only ever look at IB transports */
172 if (conn->c_trans != &rds_iw_transport)
173 return 0;
174
175 iinfo->src_addr = conn->c_laddr;
176 iinfo->dst_addr = conn->c_faddr;
177
178 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
179 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
180 if (rds_conn_state(conn) == RDS_CONN_UP) {
181 struct rds_iw_device *rds_iwdev;
182 struct rdma_dev_addr *dev_addr;
183
184 ic = conn->c_transport_data;
185 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
186
187 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
188 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
189
190 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
191 iinfo->max_send_wr = ic->i_send_ring.w_nr;
192 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
193 iinfo->max_send_sge = rds_iwdev->max_sge;
194 rds_iw_get_mr_info(rds_iwdev, iinfo);
195 }
196 return 1;
197}
198
199static void rds_iw_ic_info(struct socket *sock, unsigned int len,
200 struct rds_info_iterator *iter,
201 struct rds_info_lengths *lens)
202{
203 rds_for_each_conn_info(sock, len, iter, lens,
204 rds_iw_conn_info_visitor,
205 sizeof(struct rds_info_rdma_connection));
206}
207
208
209/*
210 * Early RDS/IB was built to only bind to an address if there is an IPoIB
211 * device with that address set.
212 *
213 * If it were me, I'd advocate for something more flexible. Sending and
214 * receiving should be device-agnostic. Transports would try and maintain
215 * connections between peers who have messages queued. Userspace would be
216 * allowed to influence which paths have priority. We could call userspace
217 * asserting this policy "routing".
218 */
219static int rds_iw_laddr_check(__be32 addr)
220{
221 int ret;
222 struct rdma_cm_id *cm_id;
223 struct sockaddr_in sin;
224
225 /* Create a CMA ID and try to bind it. This catches both
226 * IB and iWARP capable NICs.
227 */
228 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
Dan Carpenter5d57eeb2009-04-09 14:09:45 +0000229 if (IS_ERR(cm_id))
230 return PTR_ERR(cm_id);
Andy Groverfcd8b7c2009-02-24 15:30:36 +0000231
232 memset(&sin, 0, sizeof(sin));
233 sin.sin_family = AF_INET;
234 sin.sin_addr.s_addr = addr;
235
236 /* rdma_bind_addr will only succeed for IB & iWARP devices */
237 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
238 /* due to this, we will claim to support IB devices unless we
239 check node_type. */
240 if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
241 ret = -EADDRNOTAVAIL;
242
243 rdsdebug("addr %pI4 ret %d node type %d\n",
244 &addr, ret,
245 cm_id->device ? cm_id->device->node_type : -1);
246
247 rdma_destroy_id(cm_id);
248
249 return ret;
250}
251
252void rds_iw_exit(void)
253{
254 rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
Andy Grover745cbcc2009-04-01 08:20:19 +0000255 rds_iw_destroy_nodev_conns();
Andy Groverfcd8b7c2009-02-24 15:30:36 +0000256 ib_unregister_client(&rds_iw_client);
257 rds_iw_sysctl_exit();
258 rds_iw_recv_exit();
259 rds_trans_unregister(&rds_iw_transport);
260}
261
262struct rds_transport rds_iw_transport = {
263 .laddr_check = rds_iw_laddr_check,
264 .xmit_complete = rds_iw_xmit_complete,
265 .xmit = rds_iw_xmit,
266 .xmit_cong_map = NULL,
267 .xmit_rdma = rds_iw_xmit_rdma,
268 .recv = rds_iw_recv,
269 .conn_alloc = rds_iw_conn_alloc,
270 .conn_free = rds_iw_conn_free,
271 .conn_connect = rds_iw_conn_connect,
272 .conn_shutdown = rds_iw_conn_shutdown,
273 .inc_copy_to_user = rds_iw_inc_copy_to_user,
274 .inc_purge = rds_iw_inc_purge,
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",
Andy Grover335776b2009-08-21 12:28:34 +0000287 .t_type = RDS_TRANS_IWARP,
Andy Groverfcd8b7c2009-02-24 15:30:36 +0000288 .t_prefer_loopback = 1,
289};
290
291int __init 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
313 rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
314
315 goto out;
316
317out_recv:
318 rds_iw_recv_exit();
319out_sysctl:
320 rds_iw_sysctl_exit();
321out_ibreg:
322 ib_unregister_client(&rds_iw_client);
323out:
324 return ret;
325}
326
327MODULE_LICENSE("GPL");
328