Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[platform/adaptation/renesas_rcar/renesas_kernel.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 #include <linux/module.h>
42
43 #include "rds.h"
44 #include "iw.h"
45
46 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
47 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
48
49 module_param(fastreg_pool_size, int, 0444);
50 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
51 module_param(fastreg_message_size, int, 0444);
52 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
53
54 struct list_head rds_iw_devices;
55
56 /* NOTE: if also grabbing iwdev lock, grab this first */
57 DEFINE_SPINLOCK(iw_nodev_conns_lock);
58 LIST_HEAD(iw_nodev_conns);
59
60 static void rds_iw_add_one(struct ib_device *device)
61 {
62         struct rds_iw_device *rds_iwdev;
63         struct ib_device_attr *dev_attr;
64
65         /* Only handle iwarp devices */
66         if (device->node_type != RDMA_NODE_RNIC)
67                 return;
68
69         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
70         if (!dev_attr)
71                 return;
72
73         if (ib_query_device(device, dev_attr)) {
74                 rdsdebug("Query device failed for %s\n", device->name);
75                 goto free_attr;
76         }
77
78         rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
79         if (!rds_iwdev)
80                 goto free_attr;
81
82         spin_lock_init(&rds_iwdev->spinlock);
83
84         rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
85         rds_iwdev->max_wrs = dev_attr->max_qp_wr;
86         rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
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                 rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
95                                         IB_ACCESS_REMOTE_READ |
96                                         IB_ACCESS_REMOTE_WRITE |
97                                         IB_ACCESS_LOCAL_WRITE);
98                 if (IS_ERR(rds_iwdev->mr))
99                         goto err_pd;
100         } else
101                 rds_iwdev->mr = NULL;
102
103         rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
104         if (IS_ERR(rds_iwdev->mr_pool)) {
105                 rds_iwdev->mr_pool = NULL;
106                 goto err_mr;
107         }
108
109         INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
110         INIT_LIST_HEAD(&rds_iwdev->conn_list);
111         list_add_tail(&rds_iwdev->list, &rds_iw_devices);
112
113         ib_set_client_data(device, &rds_iw_client, rds_iwdev);
114
115         goto free_attr;
116
117 err_mr:
118         if (rds_iwdev->mr)
119                 ib_dereg_mr(rds_iwdev->mr);
120 err_pd:
121         ib_dealloc_pd(rds_iwdev->pd);
122 free_dev:
123         kfree(rds_iwdev);
124 free_attr:
125         kfree(dev_attr);
126 }
127
128 static void rds_iw_remove_one(struct ib_device *device)
129 {
130         struct rds_iw_device *rds_iwdev;
131         struct rds_iw_cm_id *i_cm_id, *next;
132
133         rds_iwdev = ib_get_client_data(device, &rds_iw_client);
134         if (!rds_iwdev)
135                 return;
136
137         spin_lock_irq(&rds_iwdev->spinlock);
138         list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
139                 list_del(&i_cm_id->list);
140                 kfree(i_cm_id);
141         }
142         spin_unlock_irq(&rds_iwdev->spinlock);
143
144         rds_iw_destroy_conns(rds_iwdev);
145
146         if (rds_iwdev->mr_pool)
147                 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
148
149         if (rds_iwdev->mr)
150                 ib_dereg_mr(rds_iwdev->mr);
151
152         while (ib_dealloc_pd(rds_iwdev->pd)) {
153                 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
154                 msleep(1);
155         }
156
157         list_del(&rds_iwdev->list);
158         kfree(rds_iwdev);
159 }
160
161 struct ib_client rds_iw_client = {
162         .name   = "rds_iw",
163         .add    = rds_iw_add_one,
164         .remove = rds_iw_remove_one
165 };
166
167 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
168                                     void *buffer)
169 {
170         struct rds_info_rdma_connection *iinfo = buffer;
171         struct rds_iw_connection *ic;
172
173         /* We will only ever look at IB transports */
174         if (conn->c_trans != &rds_iw_transport)
175                 return 0;
176
177         iinfo->src_addr = conn->c_laddr;
178         iinfo->dst_addr = conn->c_faddr;
179
180         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
181         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
182         if (rds_conn_state(conn) == RDS_CONN_UP) {
183                 struct rds_iw_device *rds_iwdev;
184                 struct rdma_dev_addr *dev_addr;
185
186                 ic = conn->c_transport_data;
187                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
188
189                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
190                 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
191
192                 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
193                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
194                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
195                 iinfo->max_send_sge = rds_iwdev->max_sge;
196                 rds_iw_get_mr_info(rds_iwdev, iinfo);
197         }
198         return 1;
199 }
200
201 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
202                            struct rds_info_iterator *iter,
203                            struct rds_info_lengths *lens)
204 {
205         rds_for_each_conn_info(sock, len, iter, lens,
206                                 rds_iw_conn_info_visitor,
207                                 sizeof(struct rds_info_rdma_connection));
208 }
209
210
211 /*
212  * Early RDS/IB was built to only bind to an address if there is an IPoIB
213  * device with that address set.
214  *
215  * If it were me, I'd advocate for something more flexible.  Sending and
216  * receiving should be device-agnostic.  Transports would try and maintain
217  * connections between peers who have messages queued.  Userspace would be
218  * allowed to influence which paths have priority.  We could call userspace
219  * asserting this policy "routing".
220  */
221 static int rds_iw_laddr_check(__be32 addr)
222 {
223         int ret;
224         struct rdma_cm_id *cm_id;
225         struct sockaddr_in sin;
226
227         /* Create a CMA ID and try to bind it. This catches both
228          * IB and iWARP capable NICs.
229          */
230         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
231         if (IS_ERR(cm_id))
232                 return PTR_ERR(cm_id);
233
234         memset(&sin, 0, sizeof(sin));
235         sin.sin_family = AF_INET;
236         sin.sin_addr.s_addr = addr;
237
238         /* rdma_bind_addr will only succeed for IB & iWARP devices */
239         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
240         /* due to this, we will claim to support IB devices unless we
241            check node_type. */
242         if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
243                 ret = -EADDRNOTAVAIL;
244
245         rdsdebug("addr %pI4 ret %d node type %d\n",
246                 &addr, ret,
247                 cm_id->device ? cm_id->device->node_type : -1);
248
249         rdma_destroy_id(cm_id);
250
251         return ret;
252 }
253
254 void rds_iw_exit(void)
255 {
256         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
257         rds_iw_destroy_nodev_conns();
258         ib_unregister_client(&rds_iw_client);
259         rds_iw_sysctl_exit();
260         rds_iw_recv_exit();
261         rds_trans_unregister(&rds_iw_transport);
262 }
263
264 struct rds_transport rds_iw_transport = {
265         .laddr_check            = rds_iw_laddr_check,
266         .xmit_complete          = rds_iw_xmit_complete,
267         .xmit                   = rds_iw_xmit,
268         .xmit_rdma              = rds_iw_xmit_rdma,
269         .recv                   = rds_iw_recv,
270         .conn_alloc             = rds_iw_conn_alloc,
271         .conn_free              = rds_iw_conn_free,
272         .conn_connect           = rds_iw_conn_connect,
273         .conn_shutdown          = rds_iw_conn_shutdown,
274         .inc_copy_to_user       = rds_iw_inc_copy_to_user,
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 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