aboutsummaryrefslogtreecommitdiffstats
path: root/net/rds/ib.c
diff options
context:
space:
mode:
authorAndy Grover <andy.grover@oracle.com>2009-02-24 10:30:30 -0500
committerDavid S. Miller <davem@davemloft.net>2009-02-27 02:39:30 -0500
commitec16227e14141e4fd7ae76354c09dadfe2449d9e (patch)
tree9a20de7d9a0688d721517c2b38d6be83956c7ca4 /net/rds/ib.c
parenteff5f53bef75c0864a5da06bb688939092b848dc (diff)
RDS/IB: Infiniband transport
Registers as an RDS transport and an IB client, and uses IB CM API to allocate ids, queue pairs, and the rest of that fun stuff. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/ib.c')
-rw-r--r--net/rds/ib.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/net/rds/ib.c b/net/rds/ib.c
new file mode 100644
index 000000000000..06a7b798d9a7
--- /dev/null
+++ b/net/rds/ib.c
@@ -0,0 +1,323 @@
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
44unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
45unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
46
47module_param(fmr_pool_size, int, 0444);
48MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
49module_param(fmr_message_size, int, 0444);
50MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
51
52struct list_head rds_ib_devices;
53
54DEFINE_SPINLOCK(ib_nodev_conns_lock);
55LIST_HEAD(ib_nodev_conns);
56
57void rds_ib_add_one(struct ib_device *device)
58{
59 struct rds_ib_device *rds_ibdev;
60 struct ib_device_attr *dev_attr;
61
62 /* Only handle IB (no iWARP) devices */
63 if (device->node_type != RDMA_NODE_IB_CA)
64 return;
65
66 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
67 if (!dev_attr)
68 return;
69
70 if (ib_query_device(device, dev_attr)) {
71 rdsdebug("Query device failed for %s\n", device->name);
72 goto free_attr;
73 }
74
75 rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
76 if (!rds_ibdev)
77 goto free_attr;
78
79 spin_lock_init(&rds_ibdev->spinlock);
80
81 rds_ibdev->max_wrs = dev_attr->max_qp_wr;
82 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
83
84 rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
85 rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift;
86 rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1);
87 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
88 rds_ibdev->max_fmrs = dev_attr->max_fmr ?
89 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
90 fmr_pool_size;
91
92 rds_ibdev->dev = device;
93 rds_ibdev->pd = ib_alloc_pd(device);
94 if (IS_ERR(rds_ibdev->pd))
95 goto free_dev;
96
97 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
98 IB_ACCESS_LOCAL_WRITE);
99 if (IS_ERR(rds_ibdev->mr))
100 goto err_pd;
101
102 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
103 if (IS_ERR(rds_ibdev->mr_pool)) {
104 rds_ibdev->mr_pool = NULL;
105 goto err_mr;
106 }
107
108 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
109 INIT_LIST_HEAD(&rds_ibdev->conn_list);
110 list_add_tail(&rds_ibdev->list, &rds_ib_devices);
111
112 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
113
114 goto free_attr;
115
116err_mr:
117 ib_dereg_mr(rds_ibdev->mr);
118err_pd:
119 ib_dealloc_pd(rds_ibdev->pd);
120free_dev:
121 kfree(rds_ibdev);
122free_attr:
123 kfree(dev_attr);
124}
125
126void rds_ib_remove_one(struct ib_device *device)
127{
128 struct rds_ib_device *rds_ibdev;
129 struct rds_ib_ipaddr *i_ipaddr, *i_next;
130
131 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
132 if (!rds_ibdev)
133 return;
134
135 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
136 list_del(&i_ipaddr->list);
137 kfree(i_ipaddr);
138 }
139
140 rds_ib_remove_conns(rds_ibdev);
141
142 if (rds_ibdev->mr_pool)
143 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
144
145 ib_dereg_mr(rds_ibdev->mr);
146
147 while (ib_dealloc_pd(rds_ibdev->pd)) {
148 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
149 msleep(1);
150 }
151
152 list_del(&rds_ibdev->list);
153 kfree(rds_ibdev);
154}
155
156struct ib_client rds_ib_client = {
157 .name = "rds_ib",
158 .add = rds_ib_add_one,
159 .remove = rds_ib_remove_one
160};
161
162static int rds_ib_conn_info_visitor(struct rds_connection *conn,
163 void *buffer)
164{
165 struct rds_info_rdma_connection *iinfo = buffer;
166 struct rds_ib_connection *ic;
167
168 /* We will only ever look at IB transports */
169 if (conn->c_trans != &rds_ib_transport)
170 return 0;
171
172 iinfo->src_addr = conn->c_laddr;
173 iinfo->dst_addr = conn->c_faddr;
174
175 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
176 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
177 if (rds_conn_state(conn) == RDS_CONN_UP) {
178 struct rds_ib_device *rds_ibdev;
179 struct rdma_dev_addr *dev_addr;
180
181 ic = conn->c_transport_data;
182 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
183
184 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
185 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
186
187 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
188 iinfo->max_send_wr = ic->i_send_ring.w_nr;
189 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
190 iinfo->max_send_sge = rds_ibdev->max_sge;
191 rds_ib_get_mr_info(rds_ibdev, iinfo);
192 }
193 return 1;
194}
195
196static void rds_ib_ic_info(struct socket *sock, unsigned int len,
197 struct rds_info_iterator *iter,
198 struct rds_info_lengths *lens)
199{
200 rds_for_each_conn_info(sock, len, iter, lens,
201 rds_ib_conn_info_visitor,
202 sizeof(struct rds_info_rdma_connection));
203}
204
205
206/*
207 * Early RDS/IB was built to only bind to an address if there is an IPoIB
208 * device with that address set.
209 *
210 * If it were me, I'd advocate for something more flexible. Sending and
211 * receiving should be device-agnostic. Transports would try and maintain
212 * connections between peers who have messages queued. Userspace would be
213 * allowed to influence which paths have priority. We could call userspace
214 * asserting this policy "routing".
215 */
216static int rds_ib_laddr_check(__be32 addr)
217{
218 int ret;
219 struct rdma_cm_id *cm_id;
220 struct sockaddr_in sin;
221
222 /* Create a CMA ID and try to bind it. This catches both
223 * IB and iWARP capable NICs.
224 */
225 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
226 if (!cm_id)
227 return -EADDRNOTAVAIL;
228
229 memset(&sin, 0, sizeof(sin));
230 sin.sin_family = AF_INET;
231 sin.sin_addr.s_addr = addr;
232
233 /* rdma_bind_addr will only succeed for IB & iWARP devices */
234 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
235 /* due to this, we will claim to support iWARP devices unless we
236 check node_type. */
237 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
238 ret = -EADDRNOTAVAIL;
239
240 rdsdebug("addr %pI4 ret %d node type %d\n",
241 &addr, ret,
242 cm_id->device ? cm_id->device->node_type : -1);
243
244 rdma_destroy_id(cm_id);
245
246 return ret;
247}
248
249void rds_ib_exit(void)
250{
251 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
252 rds_ib_remove_nodev_conns();
253 ib_unregister_client(&rds_ib_client);
254 rds_ib_sysctl_exit();
255 rds_ib_recv_exit();
256 rds_trans_unregister(&rds_ib_transport);
257}
258
259struct rds_transport rds_ib_transport = {
260 .laddr_check = rds_ib_laddr_check,
261 .xmit_complete = rds_ib_xmit_complete,
262 .xmit = rds_ib_xmit,
263 .xmit_cong_map = NULL,
264 .xmit_rdma = rds_ib_xmit_rdma,
265 .recv = rds_ib_recv,
266 .conn_alloc = rds_ib_conn_alloc,
267 .conn_free = rds_ib_conn_free,
268 .conn_connect = rds_ib_conn_connect,
269 .conn_shutdown = rds_ib_conn_shutdown,
270 .inc_copy_to_user = rds_ib_inc_copy_to_user,
271 .inc_purge = rds_ib_inc_purge,
272 .inc_free = rds_ib_inc_free,
273 .cm_initiate_connect = rds_ib_cm_initiate_connect,
274 .cm_handle_connect = rds_ib_cm_handle_connect,
275 .cm_connect_complete = rds_ib_cm_connect_complete,
276 .stats_info_copy = rds_ib_stats_info_copy,
277 .exit = rds_ib_exit,
278 .get_mr = rds_ib_get_mr,
279 .sync_mr = rds_ib_sync_mr,
280 .free_mr = rds_ib_free_mr,
281 .flush_mrs = rds_ib_flush_mrs,
282 .t_owner = THIS_MODULE,
283 .t_name = "infiniband",
284};
285
286int __init rds_ib_init(void)
287{
288 int ret;
289
290 INIT_LIST_HEAD(&rds_ib_devices);
291
292 ret = ib_register_client(&rds_ib_client);
293 if (ret)
294 goto out;
295
296 ret = rds_ib_sysctl_init();
297 if (ret)
298 goto out_ibreg;
299
300 ret = rds_ib_recv_init();
301 if (ret)
302 goto out_sysctl;
303
304 ret = rds_trans_register(&rds_ib_transport);
305 if (ret)
306 goto out_recv;
307
308 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
309
310 goto out;
311
312out_recv:
313 rds_ib_recv_exit();
314out_sysctl:
315 rds_ib_sysctl_exit();
316out_ibreg:
317 ib_unregister_client(&rds_ib_client);
318out:
319 return ret;
320}
321
322MODULE_LICENSE("GPL");
323