Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec...
[linux-2.6] / 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->page_shift = max(PAGE_SHIFT, ffs(dev_attr->page_size_cap) - 1);
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                 if (device->node_type != RDMA_NODE_RNIC) {
95                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
96                                                 IB_ACCESS_LOCAL_WRITE);
97                 } else {
98                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
99                                                 IB_ACCESS_REMOTE_READ |
100                                                 IB_ACCESS_REMOTE_WRITE |
101                                                 IB_ACCESS_LOCAL_WRITE);
102                 }
103                 if (IS_ERR(rds_iwdev->mr))
104                         goto err_pd;
105         } else
106                 rds_iwdev->mr = NULL;
107
108         rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
109         if (IS_ERR(rds_iwdev->mr_pool)) {
110                 rds_iwdev->mr_pool = NULL;
111                 goto err_mr;
112         }
113
114         INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
115         INIT_LIST_HEAD(&rds_iwdev->conn_list);
116         list_add_tail(&rds_iwdev->list, &rds_iw_devices);
117
118         ib_set_client_data(device, &rds_iw_client, rds_iwdev);
119
120         goto free_attr;
121
122 err_mr:
123         if (rds_iwdev->mr)
124                 ib_dereg_mr(rds_iwdev->mr);
125 err_pd:
126         ib_dealloc_pd(rds_iwdev->pd);
127 free_dev:
128         kfree(rds_iwdev);
129 free_attr:
130         kfree(dev_attr);
131 }
132
133 void rds_iw_remove_one(struct ib_device *device)
134 {
135         struct rds_iw_device *rds_iwdev;
136         struct rds_iw_cm_id *i_cm_id, *next;
137
138         rds_iwdev = ib_get_client_data(device, &rds_iw_client);
139         if (!rds_iwdev)
140                 return;
141
142         spin_lock_irq(&rds_iwdev->spinlock);
143         list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
144                 list_del(&i_cm_id->list);
145                 kfree(i_cm_id);
146         }
147         spin_unlock_irq(&rds_iwdev->spinlock);
148
149         rds_iw_destroy_conns(rds_iwdev);
150
151         if (rds_iwdev->mr_pool)
152                 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
153
154         if (rds_iwdev->mr)
155                 ib_dereg_mr(rds_iwdev->mr);
156
157         while (ib_dealloc_pd(rds_iwdev->pd)) {
158                 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
159                 msleep(1);
160         }
161
162         list_del(&rds_iwdev->list);
163         kfree(rds_iwdev);
164 }
165
166 struct ib_client rds_iw_client = {
167         .name   = "rds_iw",
168         .add    = rds_iw_add_one,
169         .remove = rds_iw_remove_one
170 };
171
172 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
173                                     void *buffer)
174 {
175         struct rds_info_rdma_connection *iinfo = buffer;
176         struct rds_iw_connection *ic;
177
178         /* We will only ever look at IB transports */
179         if (conn->c_trans != &rds_iw_transport)
180                 return 0;
181
182         iinfo->src_addr = conn->c_laddr;
183         iinfo->dst_addr = conn->c_faddr;
184
185         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
186         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
187         if (rds_conn_state(conn) == RDS_CONN_UP) {
188                 struct rds_iw_device *rds_iwdev;
189                 struct rdma_dev_addr *dev_addr;
190
191                 ic = conn->c_transport_data;
192                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
193
194                 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
195                 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
196
197                 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
198                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
199                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
200                 iinfo->max_send_sge = rds_iwdev->max_sge;
201                 rds_iw_get_mr_info(rds_iwdev, iinfo);
202         }
203         return 1;
204 }
205
206 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
207                            struct rds_info_iterator *iter,
208                            struct rds_info_lengths *lens)
209 {
210         rds_for_each_conn_info(sock, len, iter, lens,
211                                 rds_iw_conn_info_visitor,
212                                 sizeof(struct rds_info_rdma_connection));
213 }
214
215
216 /*
217  * Early RDS/IB was built to only bind to an address if there is an IPoIB
218  * device with that address set.
219  *
220  * If it were me, I'd advocate for something more flexible.  Sending and
221  * receiving should be device-agnostic.  Transports would try and maintain
222  * connections between peers who have messages queued.  Userspace would be
223  * allowed to influence which paths have priority.  We could call userspace
224  * asserting this policy "routing".
225  */
226 static int rds_iw_laddr_check(__be32 addr)
227 {
228         int ret;
229         struct rdma_cm_id *cm_id;
230         struct sockaddr_in sin;
231
232         /* Create a CMA ID and try to bind it. This catches both
233          * IB and iWARP capable NICs.
234          */
235         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
236         if (IS_ERR(cm_id))
237                 return PTR_ERR(cm_id);
238
239         memset(&sin, 0, sizeof(sin));
240         sin.sin_family = AF_INET;
241         sin.sin_addr.s_addr = addr;
242
243         /* rdma_bind_addr will only succeed for IB & iWARP devices */
244         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
245         /* due to this, we will claim to support IB devices unless we
246            check node_type. */
247         if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
248                 ret = -EADDRNOTAVAIL;
249
250         rdsdebug("addr %pI4 ret %d node type %d\n",
251                 &addr, ret,
252                 cm_id->device ? cm_id->device->node_type : -1);
253
254         rdma_destroy_id(cm_id);
255
256         return ret;
257 }
258
259 void rds_iw_exit(void)
260 {
261         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
262         rds_iw_destroy_nodev_conns();
263         ib_unregister_client(&rds_iw_client);
264         rds_iw_sysctl_exit();
265         rds_iw_recv_exit();
266         rds_trans_unregister(&rds_iw_transport);
267 }
268
269 struct rds_transport rds_iw_transport = {
270         .laddr_check            = rds_iw_laddr_check,
271         .xmit_complete          = rds_iw_xmit_complete,
272         .xmit                   = rds_iw_xmit,
273         .xmit_cong_map          = NULL,
274         .xmit_rdma              = rds_iw_xmit_rdma,
275         .recv                   = rds_iw_recv,
276         .conn_alloc             = rds_iw_conn_alloc,
277         .conn_free              = rds_iw_conn_free,
278         .conn_connect           = rds_iw_conn_connect,
279         .conn_shutdown          = rds_iw_conn_shutdown,
280         .inc_copy_to_user       = rds_iw_inc_copy_to_user,
281         .inc_purge              = rds_iw_inc_purge,
282         .inc_free               = rds_iw_inc_free,
283         .cm_initiate_connect    = rds_iw_cm_initiate_connect,
284         .cm_handle_connect      = rds_iw_cm_handle_connect,
285         .cm_connect_complete    = rds_iw_cm_connect_complete,
286         .stats_info_copy        = rds_iw_stats_info_copy,
287         .exit                   = rds_iw_exit,
288         .get_mr                 = rds_iw_get_mr,
289         .sync_mr                = rds_iw_sync_mr,
290         .free_mr                = rds_iw_free_mr,
291         .flush_mrs              = rds_iw_flush_mrs,
292         .t_owner                = THIS_MODULE,
293         .t_name                 = "iwarp",
294         .t_prefer_loopback      = 1,
295 };
296
297 int __init rds_iw_init(void)
298 {
299         int ret;
300
301         INIT_LIST_HEAD(&rds_iw_devices);
302
303         ret = ib_register_client(&rds_iw_client);
304         if (ret)
305                 goto out;
306
307         ret = rds_iw_sysctl_init();
308         if (ret)
309                 goto out_ibreg;
310
311         ret = rds_iw_recv_init();
312         if (ret)
313                 goto out_sysctl;
314
315         ret = rds_trans_register(&rds_iw_transport);
316         if (ret)
317                 goto out_recv;
318
319         rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
320
321         goto out;
322
323 out_recv:
324         rds_iw_recv_exit();
325 out_sysctl:
326         rds_iw_sysctl_exit();
327 out_ibreg:
328         ib_unregister_client(&rds_iw_client);
329 out:
330         return ret;
331 }
332
333 MODULE_LICENSE("GPL");
334