RDS: rds_send_xmit() locking/irq fixes
[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 #include <linux/slab.h>
41
42 #include "rds.h"
43 #include "iw.h"
44
45 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
46 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
47
48 module_param(fastreg_pool_size, int, 0444);
49 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
50 module_param(fastreg_message_size, int, 0444);
51 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
52
53 struct list_head rds_iw_devices;
54
55 /* NOTE: if also grabbing iwdev lock, grab this first */
56 DEFINE_SPINLOCK(iw_nodev_conns_lock);
57 LIST_HEAD(iw_nodev_conns);
58
59 void rds_iw_add_one(struct ib_device *device)
60 {
61         struct rds_iw_device *rds_iwdev;
62         struct ib_device_attr *dev_attr;
63
64         /* Only handle iwarp devices */
65         if (device->node_type != RDMA_NODE_RNIC)
66                 return;
67
68         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
69         if (!dev_attr)
70                 return;
71
72         if (ib_query_device(device, dev_attr)) {
73                 rdsdebug("Query device failed for %s\n", device->name);
74                 goto free_attr;
75         }
76
77         rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
78         if (!rds_iwdev)
79                 goto free_attr;
80
81         spin_lock_init(&rds_iwdev->spinlock);
82
83         rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
84         rds_iwdev->max_wrs = dev_attr->max_qp_wr;
85         rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
86
87         rds_iwdev->dev = device;
88         rds_iwdev->pd = ib_alloc_pd(device);
89         if (IS_ERR(rds_iwdev->pd))
90                 goto free_dev;
91
92         if (!rds_iwdev->dma_local_lkey) {
93                 rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
94                                         IB_ACCESS_REMOTE_READ |
95                                         IB_ACCESS_REMOTE_WRITE |
96                                         IB_ACCESS_LOCAL_WRITE);
97                 if (IS_ERR(rds_iwdev->mr))
98                         goto err_pd;
99         } else
100                 rds_iwdev->mr = NULL;
101
102         rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
103         if (IS_ERR(rds_iwdev->mr_pool)) {
104                 rds_iwdev->mr_pool = NULL;
105                 goto err_mr;
106         }
107
108         INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
109         INIT_LIST_HEAD(&rds_iwdev->conn_list);
110         list_add_tail(&rds_iwdev->list, &rds_iw_devices);
111
112         ib_set_client_data(device, &rds_iw_client, rds_iwdev);
113
114         goto free_attr;
115
116 err_mr:
117         if (rds_iwdev->mr)
118                 ib_dereg_mr(rds_iwdev->mr);
119 err_pd:
120         ib_dealloc_pd(rds_iwdev->pd);
121 free_dev:
122         kfree(rds_iwdev);
123 free_attr:
124         kfree(dev_attr);
125 }
126
127 void rds_iw_remove_one(struct ib_device *device)
128 {
129         struct rds_iw_device *rds_iwdev;
130         struct rds_iw_cm_id *i_cm_id, *next;
131
132         rds_iwdev = ib_get_client_data(device, &rds_iw_client);
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         while (ib_dealloc_pd(rds_iwdev->pd)) {
152                 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
153                 msleep(1);
154         }
155
156         list_del(&rds_iwdev->list);
157         kfree(rds_iwdev);
158 }
159
160 struct ib_client rds_iw_client = {
161         .name   = "rds_iw",
162         .add    = rds_iw_add_one,
163         .remove = rds_iw_remove_one
164 };
165
166 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
167                                     void *buffer)
168 {
169         struct rds_info_rdma_connection *iinfo = buffer;
170         struct rds_iw_connection *ic;
171
172         /* We will only ever look at IB transports */
173         if (conn->c_trans != &rds_iw_transport)
174                 return 0;
175
176         iinfo->src_addr = conn->c_laddr;
177         iinfo->dst_addr = conn->c_faddr;
178
179         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
180         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
181         if (rds_conn_state(conn) == RDS_CONN_UP) {
182                 struct rds_iw_device *rds_iwdev;
183                 struct rdma_dev_addr *dev_addr;
184
185                 ic = conn->c_transport_data;
186                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
187
188                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
189                 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
190
191                 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
192                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
193                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
194                 iinfo->max_send_sge = rds_iwdev->max_sge;
195                 rds_iw_get_mr_info(rds_iwdev, iinfo);
196         }
197         return 1;
198 }
199
200 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
201                            struct rds_info_iterator *iter,
202                            struct rds_info_lengths *lens)
203 {
204         rds_for_each_conn_info(sock, len, iter, lens,
205                                 rds_iw_conn_info_visitor,
206                                 sizeof(struct rds_info_rdma_connection));
207 }
208
209
210 /*
211  * Early RDS/IB was built to only bind to an address if there is an IPoIB
212  * device with that address set.
213  *
214  * If it were me, I'd advocate for something more flexible.  Sending and
215  * receiving should be device-agnostic.  Transports would try and maintain
216  * connections between peers who have messages queued.  Userspace would be
217  * allowed to influence which paths have priority.  We could call userspace
218  * asserting this policy "routing".
219  */
220 static int rds_iw_laddr_check(__be32 addr)
221 {
222         int ret;
223         struct rdma_cm_id *cm_id;
224         struct sockaddr_in sin;
225
226         /* Create a CMA ID and try to bind it. This catches both
227          * IB and iWARP capable NICs.
228          */
229         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
230         if (IS_ERR(cm_id))
231                 return PTR_ERR(cm_id);
232
233         memset(&sin, 0, sizeof(sin));
234         sin.sin_family = AF_INET;
235         sin.sin_addr.s_addr = addr;
236
237         /* rdma_bind_addr will only succeed for IB & iWARP devices */
238         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
239         /* due to this, we will claim to support IB devices unless we
240            check node_type. */
241         if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
242                 ret = -EADDRNOTAVAIL;
243
244         rdsdebug("addr %pI4 ret %d node type %d\n",
245                 &addr, ret,
246                 cm_id->device ? cm_id->device->node_type : -1);
247
248         rdma_destroy_id(cm_id);
249
250         return ret;
251 }
252
253 void rds_iw_exit(void)
254 {
255         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
256         rds_iw_destroy_nodev_conns();
257         ib_unregister_client(&rds_iw_client);
258         rds_iw_sysctl_exit();
259         rds_iw_recv_exit();
260         rds_trans_unregister(&rds_iw_transport);
261 }
262
263 struct rds_transport rds_iw_transport = {
264         .laddr_check            = rds_iw_laddr_check,
265         .xmit_complete          = rds_iw_xmit_complete,
266         .xmit                   = rds_iw_xmit,
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_free               = rds_iw_inc_free,
275         .cm_initiate_connect    = rds_iw_cm_initiate_connect,
276         .cm_handle_connect      = rds_iw_cm_handle_connect,
277         .cm_connect_complete    = rds_iw_cm_connect_complete,
278         .stats_info_copy        = rds_iw_stats_info_copy,
279         .exit                   = rds_iw_exit,
280         .get_mr                 = rds_iw_get_mr,
281         .sync_mr                = rds_iw_sync_mr,
282         .free_mr                = rds_iw_free_mr,
283         .flush_mrs              = rds_iw_flush_mrs,
284         .t_owner                = THIS_MODULE,
285         .t_name                 = "iwarp",
286         .t_type                 = RDS_TRANS_IWARP,
287         .t_prefer_loopback      = 1,
288 };
289
290 int __init rds_iw_init(void)
291 {
292         int ret;
293
294         INIT_LIST_HEAD(&rds_iw_devices);
295
296         ret = ib_register_client(&rds_iw_client);
297         if (ret)
298                 goto out;
299
300         ret = rds_iw_sysctl_init();
301         if (ret)
302                 goto out_ibreg;
303
304         ret = rds_iw_recv_init();
305         if (ret)
306                 goto out_sysctl;
307
308         ret = rds_trans_register(&rds_iw_transport);
309         if (ret)
310                 goto out_recv;
311
312         rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
313
314         goto out;
315
316 out_recv:
317         rds_iw_recv_exit();
318 out_sysctl:
319         rds_iw_sysctl_exit();
320 out_ibreg:
321         ib_unregister_client(&rds_iw_client);
322 out:
323         return ret;
324 }
325
326 MODULE_LICENSE("GPL");
327