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TOMOYO Linux Cross Reference
Linux/net/rds/iw.c

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  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 ||
243             cm_id->device->node_type != RDMA_NODE_RNIC)
244                 ret = -EADDRNOTAVAIL;
245 
246         rdsdebug("addr %pI4 ret %d node type %d\n",
247                 &addr, ret,
248                 cm_id->device ? cm_id->device->node_type : -1);
249 
250         rdma_destroy_id(cm_id);
251 
252         return ret;
253 }
254 
255 void rds_iw_exit(void)
256 {
257         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
258         rds_iw_destroy_nodev_conns();
259         ib_unregister_client(&rds_iw_client);
260         rds_iw_sysctl_exit();
261         rds_iw_recv_exit();
262         rds_trans_unregister(&rds_iw_transport);
263 }
264 
265 struct rds_transport rds_iw_transport = {
266         .laddr_check            = rds_iw_laddr_check,
267         .xmit_complete          = rds_iw_xmit_complete,
268         .xmit                   = rds_iw_xmit,
269         .xmit_rdma              = rds_iw_xmit_rdma,
270         .recv                   = rds_iw_recv,
271         .conn_alloc             = rds_iw_conn_alloc,
272         .conn_free              = rds_iw_conn_free,
273         .conn_connect           = rds_iw_conn_connect,
274         .conn_shutdown          = rds_iw_conn_shutdown,
275         .inc_copy_to_user       = rds_iw_inc_copy_to_user,
276         .inc_free               = rds_iw_inc_free,
277         .cm_initiate_connect    = rds_iw_cm_initiate_connect,
278         .cm_handle_connect      = rds_iw_cm_handle_connect,
279         .cm_connect_complete    = rds_iw_cm_connect_complete,
280         .stats_info_copy        = rds_iw_stats_info_copy,
281         .exit                   = rds_iw_exit,
282         .get_mr                 = rds_iw_get_mr,
283         .sync_mr                = rds_iw_sync_mr,
284         .free_mr                = rds_iw_free_mr,
285         .flush_mrs              = rds_iw_flush_mrs,
286         .t_owner                = THIS_MODULE,
287         .t_name                 = "iwarp",
288         .t_type                 = RDS_TRANS_IWARP,
289         .t_prefer_loopback      = 1,
290 };
291 
292 int rds_iw_init(void)
293 {
294         int ret;
295 
296         INIT_LIST_HEAD(&rds_iw_devices);
297 
298         ret = ib_register_client(&rds_iw_client);
299         if (ret)
300                 goto out;
301 
302         ret = rds_iw_sysctl_init();
303         if (ret)
304                 goto out_ibreg;
305 
306         ret = rds_iw_recv_init();
307         if (ret)
308                 goto out_sysctl;
309 
310         ret = rds_trans_register(&rds_iw_transport);
311         if (ret)
312                 goto out_recv;
313 
314         rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
315 
316         goto out;
317 
318 out_recv:
319         rds_iw_recv_exit();
320 out_sysctl:
321         rds_iw_sysctl_exit();
322 out_ibreg:
323         ib_unregister_client(&rds_iw_client);
324 out:
325         return ret;
326 }
327 
328 MODULE_LICENSE("GPL");
329 
330 

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