perf probe: Add missing variable initialization
[linux-2.6.git] / net / rds / iw.c
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 "iw.h"
43
44 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
45 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
46
47 module_param(fastreg_pool_size, int, 0444);
48 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
49 module_param(fastreg_message_size, int, 0444);
50 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
51
52 struct list_head rds_iw_devices;
53
54 /* NOTE: if also grabbing iwdev lock, grab this first */
55 DEFINE_SPINLOCK(iw_nodev_conns_lock);
56 LIST_HEAD(iw_nodev_conns);
57
58 void 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
86         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) {
92                 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);
96                 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
115 err_mr:
116         if (rds_iwdev->mr)
117                 ib_dereg_mr(rds_iwdev->mr);
118 err_pd:
119         ib_dealloc_pd(rds_iwdev->pd);
120 free_dev:
121         kfree(rds_iwdev);
122 free_attr:
123         kfree(dev_attr);
124 }
125
126 void 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
142         rds_iw_destroy_conns(rds_iwdev);
143
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
159 struct ib_client rds_iw_client = {
160         .name   = "rds_iw",
161         .add    = rds_iw_add_one,
162         .remove = rds_iw_remove_one
163 };
164
165 static 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                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
188                 rdma_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
199 static 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  */
219 static 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);
229         if (IS_ERR(cm_id))
230                 return PTR_ERR(cm_id);
231
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
252 void rds_iw_exit(void)
253 {
254         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
255         rds_iw_destroy_nodev_conns();
256         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
262 struct 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",
287         .t_type                 = RDS_TRANS_IWARP,
288         .t_prefer_loopback      = 1,
289 };
290
291 int __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
317 out_recv:
318         rds_iw_recv_exit();
319 out_sysctl:
320         rds_iw_sysctl_exit();
321 out_ibreg:
322         ib_unregister_client(&rds_iw_client);
323 out:
324         return ret;
325 }
326
327 MODULE_LICENSE("GPL");
328