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TOMOYO Linux Cross Reference
Linux/net/rds/ib.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 "ib.h"
 45 
 46 unsigned int rds_ib_fmr_1m_pool_size = RDS_FMR_1M_POOL_SIZE;
 47 unsigned int rds_ib_fmr_8k_pool_size = RDS_FMR_8K_POOL_SIZE;
 48 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 49 
 50 module_param(rds_ib_fmr_1m_pool_size, int, 0444);
 51 MODULE_PARM_DESC(rds_ib_fmr_1m_pool_size, " Max number of 1M fmr per HCA");
 52 module_param(rds_ib_fmr_8k_pool_size, int, 0444);
 53 MODULE_PARM_DESC(rds_ib_fmr_8k_pool_size, " Max number of 8K fmr per HCA");
 54 module_param(rds_ib_retry_count, int, 0444);
 55 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
 56 
 57 /*
 58  * we have a clumsy combination of RCU and a rwsem protecting this list
 59  * because it is used both in the get_mr fast path and while blocking in
 60  * the FMR flushing path.
 61  */
 62 DECLARE_RWSEM(rds_ib_devices_lock);
 63 struct list_head rds_ib_devices;
 64 
 65 /* NOTE: if also grabbing ibdev lock, grab this first */
 66 DEFINE_SPINLOCK(ib_nodev_conns_lock);
 67 LIST_HEAD(ib_nodev_conns);
 68 
 69 static void rds_ib_nodev_connect(void)
 70 {
 71         struct rds_ib_connection *ic;
 72 
 73         spin_lock(&ib_nodev_conns_lock);
 74         list_for_each_entry(ic, &ib_nodev_conns, ib_node)
 75                 rds_conn_connect_if_down(ic->conn);
 76         spin_unlock(&ib_nodev_conns_lock);
 77 }
 78 
 79 static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
 80 {
 81         struct rds_ib_connection *ic;
 82         unsigned long flags;
 83 
 84         spin_lock_irqsave(&rds_ibdev->spinlock, flags);
 85         list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
 86                 rds_conn_drop(ic->conn);
 87         spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
 88 }
 89 
 90 /*
 91  * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
 92  * from interrupt context so we push freing off into a work struct in krdsd.
 93  */
 94 static void rds_ib_dev_free(struct work_struct *work)
 95 {
 96         struct rds_ib_ipaddr *i_ipaddr, *i_next;
 97         struct rds_ib_device *rds_ibdev = container_of(work,
 98                                         struct rds_ib_device, free_work);
 99 
100         if (rds_ibdev->mr_8k_pool)
101                 rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
102         if (rds_ibdev->mr_1m_pool)
103                 rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
104         if (rds_ibdev->pd)
105                 ib_dealloc_pd(rds_ibdev->pd);
106 
107         list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
108                 list_del(&i_ipaddr->list);
109                 kfree(i_ipaddr);
110         }
111 
112         kfree(rds_ibdev);
113 }
114 
115 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
116 {
117         BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
118         if (atomic_dec_and_test(&rds_ibdev->refcount))
119                 queue_work(rds_wq, &rds_ibdev->free_work);
120 }
121 
122 static void rds_ib_add_one(struct ib_device *device)
123 {
124         struct rds_ib_device *rds_ibdev;
125 
126         /* Only handle IB (no iWARP) devices */
127         if (device->node_type != RDMA_NODE_IB_CA)
128                 return;
129 
130         rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
131                                  ibdev_to_node(device));
132         if (!rds_ibdev)
133                 return;
134 
135         spin_lock_init(&rds_ibdev->spinlock);
136         atomic_set(&rds_ibdev->refcount, 1);
137         INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
138 
139         rds_ibdev->max_wrs = device->attrs.max_qp_wr;
140         rds_ibdev->max_sge = min(device->attrs.max_sge, RDS_IB_MAX_SGE);
141 
142         rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
143         rds_ibdev->max_1m_fmrs = device->attrs.max_mr ?
144                 min_t(unsigned int, (device->attrs.max_mr / 2),
145                       rds_ib_fmr_1m_pool_size) : rds_ib_fmr_1m_pool_size;
146 
147         rds_ibdev->max_8k_fmrs = device->attrs.max_mr ?
148                 min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
149                       rds_ib_fmr_8k_pool_size) : rds_ib_fmr_8k_pool_size;
150 
151         rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
152         rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
153 
154         rds_ibdev->dev = device;
155         rds_ibdev->pd = ib_alloc_pd(device);
156         if (IS_ERR(rds_ibdev->pd)) {
157                 rds_ibdev->pd = NULL;
158                 goto put_dev;
159         }
160 
161         rds_ibdev->mr_1m_pool =
162                 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
163         if (IS_ERR(rds_ibdev->mr_1m_pool)) {
164                 rds_ibdev->mr_1m_pool = NULL;
165                 goto put_dev;
166         }
167 
168         rds_ibdev->mr_8k_pool =
169                 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
170         if (IS_ERR(rds_ibdev->mr_8k_pool)) {
171                 rds_ibdev->mr_8k_pool = NULL;
172                 goto put_dev;
173         }
174 
175         rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_fmrs = %d, max_8k_fmrs = %d\n",
176                  device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
177                  rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_fmrs,
178                  rds_ibdev->max_8k_fmrs);
179 
180         INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
181         INIT_LIST_HEAD(&rds_ibdev->conn_list);
182 
183         down_write(&rds_ib_devices_lock);
184         list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
185         up_write(&rds_ib_devices_lock);
186         atomic_inc(&rds_ibdev->refcount);
187 
188         ib_set_client_data(device, &rds_ib_client, rds_ibdev);
189         atomic_inc(&rds_ibdev->refcount);
190 
191         rds_ib_nodev_connect();
192 
193 put_dev:
194         rds_ib_dev_put(rds_ibdev);
195 }
196 
197 /*
198  * New connections use this to find the device to associate with the
199  * connection.  It's not in the fast path so we're not concerned about the
200  * performance of the IB call.  (As of this writing, it uses an interrupt
201  * blocking spinlock to serialize walking a per-device list of all registered
202  * clients.)
203  *
204  * RCU is used to handle incoming connections racing with device teardown.
205  * Rather than use a lock to serialize removal from the client_data and
206  * getting a new reference, we use an RCU grace period.  The destruction
207  * path removes the device from client_data and then waits for all RCU
208  * readers to finish.
209  *
210  * A new connection can get NULL from this if its arriving on a
211  * device that is in the process of being removed.
212  */
213 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
214 {
215         struct rds_ib_device *rds_ibdev;
216 
217         rcu_read_lock();
218         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
219         if (rds_ibdev)
220                 atomic_inc(&rds_ibdev->refcount);
221         rcu_read_unlock();
222         return rds_ibdev;
223 }
224 
225 /*
226  * The IB stack is letting us know that a device is going away.  This can
227  * happen if the underlying HCA driver is removed or if PCI hotplug is removing
228  * the pci function, for example.
229  *
230  * This can be called at any time and can be racing with any other RDS path.
231  */
232 static void rds_ib_remove_one(struct ib_device *device, void *client_data)
233 {
234         struct rds_ib_device *rds_ibdev = client_data;
235 
236         if (!rds_ibdev)
237                 return;
238 
239         rds_ib_dev_shutdown(rds_ibdev);
240 
241         /* stop connection attempts from getting a reference to this device. */
242         ib_set_client_data(device, &rds_ib_client, NULL);
243 
244         down_write(&rds_ib_devices_lock);
245         list_del_rcu(&rds_ibdev->list);
246         up_write(&rds_ib_devices_lock);
247 
248         /*
249          * This synchronize rcu is waiting for readers of both the ib
250          * client data and the devices list to finish before we drop
251          * both of those references.
252          */
253         synchronize_rcu();
254         rds_ib_dev_put(rds_ibdev);
255         rds_ib_dev_put(rds_ibdev);
256 }
257 
258 struct ib_client rds_ib_client = {
259         .name   = "rds_ib",
260         .add    = rds_ib_add_one,
261         .remove = rds_ib_remove_one
262 };
263 
264 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
265                                     void *buffer)
266 {
267         struct rds_info_rdma_connection *iinfo = buffer;
268         struct rds_ib_connection *ic;
269 
270         /* We will only ever look at IB transports */
271         if (conn->c_trans != &rds_ib_transport)
272                 return 0;
273 
274         iinfo->src_addr = conn->c_laddr;
275         iinfo->dst_addr = conn->c_faddr;
276 
277         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
278         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
279         if (rds_conn_state(conn) == RDS_CONN_UP) {
280                 struct rds_ib_device *rds_ibdev;
281                 struct rdma_dev_addr *dev_addr;
282 
283                 ic = conn->c_transport_data;
284                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
285 
286                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
287                 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
288 
289                 rds_ibdev = ic->rds_ibdev;
290                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
291                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
292                 iinfo->max_send_sge = rds_ibdev->max_sge;
293                 rds_ib_get_mr_info(rds_ibdev, iinfo);
294         }
295         return 1;
296 }
297 
298 static void rds_ib_ic_info(struct socket *sock, unsigned int len,
299                            struct rds_info_iterator *iter,
300                            struct rds_info_lengths *lens)
301 {
302         rds_for_each_conn_info(sock, len, iter, lens,
303                                 rds_ib_conn_info_visitor,
304                                 sizeof(struct rds_info_rdma_connection));
305 }
306 
307 
308 /*
309  * Early RDS/IB was built to only bind to an address if there is an IPoIB
310  * device with that address set.
311  *
312  * If it were me, I'd advocate for something more flexible.  Sending and
313  * receiving should be device-agnostic.  Transports would try and maintain
314  * connections between peers who have messages queued.  Userspace would be
315  * allowed to influence which paths have priority.  We could call userspace
316  * asserting this policy "routing".
317  */
318 static int rds_ib_laddr_check(struct net *net, __be32 addr)
319 {
320         int ret;
321         struct rdma_cm_id *cm_id;
322         struct sockaddr_in sin;
323 
324         /* Create a CMA ID and try to bind it. This catches both
325          * IB and iWARP capable NICs.
326          */
327         cm_id = rdma_create_id(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
328         if (IS_ERR(cm_id))
329                 return PTR_ERR(cm_id);
330 
331         memset(&sin, 0, sizeof(sin));
332         sin.sin_family = AF_INET;
333         sin.sin_addr.s_addr = addr;
334 
335         /* rdma_bind_addr will only succeed for IB & iWARP devices */
336         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
337         /* due to this, we will claim to support iWARP devices unless we
338            check node_type. */
339         if (ret || !cm_id->device ||
340             cm_id->device->node_type != RDMA_NODE_IB_CA)
341                 ret = -EADDRNOTAVAIL;
342 
343         rdsdebug("addr %pI4 ret %d node type %d\n",
344                 &addr, ret,
345                 cm_id->device ? cm_id->device->node_type : -1);
346 
347         rdma_destroy_id(cm_id);
348 
349         return ret;
350 }
351 
352 static void rds_ib_unregister_client(void)
353 {
354         ib_unregister_client(&rds_ib_client);
355         /* wait for rds_ib_dev_free() to complete */
356         flush_workqueue(rds_wq);
357 }
358 
359 void rds_ib_exit(void)
360 {
361         rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
362         rds_ib_unregister_client();
363         rds_ib_destroy_nodev_conns();
364         rds_ib_sysctl_exit();
365         rds_ib_recv_exit();
366         rds_trans_unregister(&rds_ib_transport);
367         rds_ib_fmr_exit();
368 }
369 
370 struct rds_transport rds_ib_transport = {
371         .laddr_check            = rds_ib_laddr_check,
372         .xmit_complete          = rds_ib_xmit_complete,
373         .xmit                   = rds_ib_xmit,
374         .xmit_rdma              = rds_ib_xmit_rdma,
375         .xmit_atomic            = rds_ib_xmit_atomic,
376         .recv                   = rds_ib_recv,
377         .conn_alloc             = rds_ib_conn_alloc,
378         .conn_free              = rds_ib_conn_free,
379         .conn_connect           = rds_ib_conn_connect,
380         .conn_shutdown          = rds_ib_conn_shutdown,
381         .inc_copy_to_user       = rds_ib_inc_copy_to_user,
382         .inc_free               = rds_ib_inc_free,
383         .cm_initiate_connect    = rds_ib_cm_initiate_connect,
384         .cm_handle_connect      = rds_ib_cm_handle_connect,
385         .cm_connect_complete    = rds_ib_cm_connect_complete,
386         .stats_info_copy        = rds_ib_stats_info_copy,
387         .exit                   = rds_ib_exit,
388         .get_mr                 = rds_ib_get_mr,
389         .sync_mr                = rds_ib_sync_mr,
390         .free_mr                = rds_ib_free_mr,
391         .flush_mrs              = rds_ib_flush_mrs,
392         .t_owner                = THIS_MODULE,
393         .t_name                 = "infiniband",
394         .t_type                 = RDS_TRANS_IB
395 };
396 
397 int rds_ib_init(void)
398 {
399         int ret;
400 
401         INIT_LIST_HEAD(&rds_ib_devices);
402 
403         ret = rds_ib_fmr_init();
404         if (ret)
405                 goto out;
406 
407         ret = ib_register_client(&rds_ib_client);
408         if (ret)
409                 goto out_fmr_exit;
410 
411         ret = rds_ib_sysctl_init();
412         if (ret)
413                 goto out_ibreg;
414 
415         ret = rds_ib_recv_init();
416         if (ret)
417                 goto out_sysctl;
418 
419         ret = rds_trans_register(&rds_ib_transport);
420         if (ret)
421                 goto out_recv;
422 
423         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
424 
425         goto out;
426 
427 out_recv:
428         rds_ib_recv_exit();
429 out_sysctl:
430         rds_ib_sysctl_exit();
431 out_ibreg:
432         rds_ib_unregister_client();
433 out_fmr_exit:
434         rds_ib_fmr_exit();
435 out:
436         return ret;
437 }
438 
439 MODULE_LICENSE("GPL");
440 
441 

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