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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_single_path.h"
 44 #include "rds.h"
 45 #include "ib.h"
 46 #include "ib_mr.h"
 47 
 48 static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
 49 static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
 50 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 51 static atomic_t rds_ib_unloading;
 52 
 53 module_param(rds_ib_mr_1m_pool_size, int, 0444);
 54 MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
 55 module_param(rds_ib_mr_8k_pool_size, int, 0444);
 56 MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
 57 module_param(rds_ib_retry_count, int, 0444);
 58 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
 59 
 60 /*
 61  * we have a clumsy combination of RCU and a rwsem protecting this list
 62  * because it is used both in the get_mr fast path and while blocking in
 63  * the FMR flushing path.
 64  */
 65 DECLARE_RWSEM(rds_ib_devices_lock);
 66 struct list_head rds_ib_devices;
 67 
 68 /* NOTE: if also grabbing ibdev lock, grab this first */
 69 DEFINE_SPINLOCK(ib_nodev_conns_lock);
 70 LIST_HEAD(ib_nodev_conns);
 71 
 72 static void rds_ib_nodev_connect(void)
 73 {
 74         struct rds_ib_connection *ic;
 75 
 76         spin_lock(&ib_nodev_conns_lock);
 77         list_for_each_entry(ic, &ib_nodev_conns, ib_node)
 78                 rds_conn_connect_if_down(ic->conn);
 79         spin_unlock(&ib_nodev_conns_lock);
 80 }
 81 
 82 static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
 83 {
 84         struct rds_ib_connection *ic;
 85         unsigned long flags;
 86 
 87         spin_lock_irqsave(&rds_ibdev->spinlock, flags);
 88         list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
 89                 rds_conn_drop(ic->conn);
 90         spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
 91 }
 92 
 93 /*
 94  * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
 95  * from interrupt context so we push freing off into a work struct in krdsd.
 96  */
 97 static void rds_ib_dev_free(struct work_struct *work)
 98 {
 99         struct rds_ib_ipaddr *i_ipaddr, *i_next;
100         struct rds_ib_device *rds_ibdev = container_of(work,
101                                         struct rds_ib_device, free_work);
102 
103         if (rds_ibdev->mr_8k_pool)
104                 rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
105         if (rds_ibdev->mr_1m_pool)
106                 rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
107         if (rds_ibdev->pd)
108                 ib_dealloc_pd(rds_ibdev->pd);
109 
110         list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
111                 list_del(&i_ipaddr->list);
112                 kfree(i_ipaddr);
113         }
114 
115         kfree(rds_ibdev->vector_load);
116 
117         kfree(rds_ibdev);
118 }
119 
120 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
121 {
122         BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
123         if (refcount_dec_and_test(&rds_ibdev->refcount))
124                 queue_work(rds_wq, &rds_ibdev->free_work);
125 }
126 
127 static void rds_ib_add_one(struct ib_device *device)
128 {
129         struct rds_ib_device *rds_ibdev;
130         bool has_fr, has_fmr;
131 
132         /* Only handle IB (no iWARP) devices */
133         if (device->node_type != RDMA_NODE_IB_CA)
134                 return;
135 
136         rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
137                                  ibdev_to_node(device));
138         if (!rds_ibdev)
139                 return;
140 
141         spin_lock_init(&rds_ibdev->spinlock);
142         refcount_set(&rds_ibdev->refcount, 1);
143         INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
144 
145         rds_ibdev->max_wrs = device->attrs.max_qp_wr;
146         rds_ibdev->max_sge = min(device->attrs.max_sge, RDS_IB_MAX_SGE);
147 
148         has_fr = (device->attrs.device_cap_flags &
149                   IB_DEVICE_MEM_MGT_EXTENSIONS);
150         has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
151                    device->map_phys_fmr && device->unmap_fmr);
152         rds_ibdev->use_fastreg = (has_fr && !has_fmr);
153 
154         rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
155         rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
156                 min_t(unsigned int, (device->attrs.max_mr / 2),
157                       rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
158 
159         rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
160                 min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
161                       rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
162 
163         rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
164         rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
165 
166         rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
167                                          sizeof(int),
168                                          GFP_KERNEL);
169         if (!rds_ibdev->vector_load) {
170                 pr_err("RDS/IB: %s failed to allocate vector memory\n",
171                         __func__);
172                 goto put_dev;
173         }
174 
175         rds_ibdev->dev = device;
176         rds_ibdev->pd = ib_alloc_pd(device, 0);
177         if (IS_ERR(rds_ibdev->pd)) {
178                 rds_ibdev->pd = NULL;
179                 goto put_dev;
180         }
181 
182         rds_ibdev->mr_1m_pool =
183                 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
184         if (IS_ERR(rds_ibdev->mr_1m_pool)) {
185                 rds_ibdev->mr_1m_pool = NULL;
186                 goto put_dev;
187         }
188 
189         rds_ibdev->mr_8k_pool =
190                 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
191         if (IS_ERR(rds_ibdev->mr_8k_pool)) {
192                 rds_ibdev->mr_8k_pool = NULL;
193                 goto put_dev;
194         }
195 
196         rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
197                  device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
198                  rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
199                  rds_ibdev->max_8k_mrs);
200 
201         pr_info("RDS/IB: %s: %s supported and preferred\n",
202                 device->name,
203                 rds_ibdev->use_fastreg ? "FRMR" : "FMR");
204 
205         INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
206         INIT_LIST_HEAD(&rds_ibdev->conn_list);
207 
208         down_write(&rds_ib_devices_lock);
209         list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
210         up_write(&rds_ib_devices_lock);
211         refcount_inc(&rds_ibdev->refcount);
212 
213         ib_set_client_data(device, &rds_ib_client, rds_ibdev);
214         refcount_inc(&rds_ibdev->refcount);
215 
216         rds_ib_nodev_connect();
217 
218 put_dev:
219         rds_ib_dev_put(rds_ibdev);
220 }
221 
222 /*
223  * New connections use this to find the device to associate with the
224  * connection.  It's not in the fast path so we're not concerned about the
225  * performance of the IB call.  (As of this writing, it uses an interrupt
226  * blocking spinlock to serialize walking a per-device list of all registered
227  * clients.)
228  *
229  * RCU is used to handle incoming connections racing with device teardown.
230  * Rather than use a lock to serialize removal from the client_data and
231  * getting a new reference, we use an RCU grace period.  The destruction
232  * path removes the device from client_data and then waits for all RCU
233  * readers to finish.
234  *
235  * A new connection can get NULL from this if its arriving on a
236  * device that is in the process of being removed.
237  */
238 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
239 {
240         struct rds_ib_device *rds_ibdev;
241 
242         rcu_read_lock();
243         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
244         if (rds_ibdev)
245                 refcount_inc(&rds_ibdev->refcount);
246         rcu_read_unlock();
247         return rds_ibdev;
248 }
249 
250 /*
251  * The IB stack is letting us know that a device is going away.  This can
252  * happen if the underlying HCA driver is removed or if PCI hotplug is removing
253  * the pci function, for example.
254  *
255  * This can be called at any time and can be racing with any other RDS path.
256  */
257 static void rds_ib_remove_one(struct ib_device *device, void *client_data)
258 {
259         struct rds_ib_device *rds_ibdev = client_data;
260 
261         if (!rds_ibdev)
262                 return;
263 
264         rds_ib_dev_shutdown(rds_ibdev);
265 
266         /* stop connection attempts from getting a reference to this device. */
267         ib_set_client_data(device, &rds_ib_client, NULL);
268 
269         down_write(&rds_ib_devices_lock);
270         list_del_rcu(&rds_ibdev->list);
271         up_write(&rds_ib_devices_lock);
272 
273         /*
274          * This synchronize rcu is waiting for readers of both the ib
275          * client data and the devices list to finish before we drop
276          * both of those references.
277          */
278         synchronize_rcu();
279         rds_ib_dev_put(rds_ibdev);
280         rds_ib_dev_put(rds_ibdev);
281 }
282 
283 struct ib_client rds_ib_client = {
284         .name   = "rds_ib",
285         .add    = rds_ib_add_one,
286         .remove = rds_ib_remove_one
287 };
288 
289 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
290                                     void *buffer)
291 {
292         struct rds_info_rdma_connection *iinfo = buffer;
293         struct rds_ib_connection *ic;
294 
295         /* We will only ever look at IB transports */
296         if (conn->c_trans != &rds_ib_transport)
297                 return 0;
298 
299         iinfo->src_addr = conn->c_laddr;
300         iinfo->dst_addr = conn->c_faddr;
301 
302         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
303         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
304         if (rds_conn_state(conn) == RDS_CONN_UP) {
305                 struct rds_ib_device *rds_ibdev;
306 
307                 ic = conn->c_transport_data;
308 
309                 rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
310                                (union ib_gid *)&iinfo->dst_gid);
311 
312                 rds_ibdev = ic->rds_ibdev;
313                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
314                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
315                 iinfo->max_send_sge = rds_ibdev->max_sge;
316                 rds_ib_get_mr_info(rds_ibdev, iinfo);
317         }
318         return 1;
319 }
320 
321 static void rds_ib_ic_info(struct socket *sock, unsigned int len,
322                            struct rds_info_iterator *iter,
323                            struct rds_info_lengths *lens)
324 {
325         u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
326 
327         rds_for_each_conn_info(sock, len, iter, lens,
328                                 rds_ib_conn_info_visitor,
329                                 buffer,
330                                 sizeof(struct rds_info_rdma_connection));
331 }
332 
333 
334 /*
335  * Early RDS/IB was built to only bind to an address if there is an IPoIB
336  * device with that address set.
337  *
338  * If it were me, I'd advocate for something more flexible.  Sending and
339  * receiving should be device-agnostic.  Transports would try and maintain
340  * connections between peers who have messages queued.  Userspace would be
341  * allowed to influence which paths have priority.  We could call userspace
342  * asserting this policy "routing".
343  */
344 static int rds_ib_laddr_check(struct net *net, __be32 addr)
345 {
346         int ret;
347         struct rdma_cm_id *cm_id;
348         struct sockaddr_in sin;
349 
350         /* Create a CMA ID and try to bind it. This catches both
351          * IB and iWARP capable NICs.
352          */
353         cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
354                                NULL, RDMA_PS_TCP, IB_QPT_RC);
355         if (IS_ERR(cm_id))
356                 return PTR_ERR(cm_id);
357 
358         memset(&sin, 0, sizeof(sin));
359         sin.sin_family = AF_INET;
360         sin.sin_addr.s_addr = addr;
361 
362         /* rdma_bind_addr will only succeed for IB & iWARP devices */
363         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
364         /* due to this, we will claim to support iWARP devices unless we
365            check node_type. */
366         if (ret || !cm_id->device ||
367             cm_id->device->node_type != RDMA_NODE_IB_CA)
368                 ret = -EADDRNOTAVAIL;
369 
370         rdsdebug("addr %pI4 ret %d node type %d\n",
371                 &addr, ret,
372                 cm_id->device ? cm_id->device->node_type : -1);
373 
374         rdma_destroy_id(cm_id);
375 
376         return ret;
377 }
378 
379 static void rds_ib_unregister_client(void)
380 {
381         ib_unregister_client(&rds_ib_client);
382         /* wait for rds_ib_dev_free() to complete */
383         flush_workqueue(rds_wq);
384 }
385 
386 static void rds_ib_set_unloading(void)
387 {
388         atomic_set(&rds_ib_unloading, 1);
389 }
390 
391 static bool rds_ib_is_unloading(struct rds_connection *conn)
392 {
393         struct rds_conn_path *cp = &conn->c_path[0];
394 
395         return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
396                 atomic_read(&rds_ib_unloading) != 0);
397 }
398 
399 void rds_ib_exit(void)
400 {
401         rds_ib_set_unloading();
402         synchronize_rcu();
403         rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
404         rds_ib_unregister_client();
405         rds_ib_destroy_nodev_conns();
406         rds_ib_sysctl_exit();
407         rds_ib_recv_exit();
408         rds_trans_unregister(&rds_ib_transport);
409         rds_ib_mr_exit();
410 }
411 
412 struct rds_transport rds_ib_transport = {
413         .laddr_check            = rds_ib_laddr_check,
414         .xmit_path_complete     = rds_ib_xmit_path_complete,
415         .xmit                   = rds_ib_xmit,
416         .xmit_rdma              = rds_ib_xmit_rdma,
417         .xmit_atomic            = rds_ib_xmit_atomic,
418         .recv_path              = rds_ib_recv_path,
419         .conn_alloc             = rds_ib_conn_alloc,
420         .conn_free              = rds_ib_conn_free,
421         .conn_path_connect      = rds_ib_conn_path_connect,
422         .conn_path_shutdown     = rds_ib_conn_path_shutdown,
423         .inc_copy_to_user       = rds_ib_inc_copy_to_user,
424         .inc_free               = rds_ib_inc_free,
425         .cm_initiate_connect    = rds_ib_cm_initiate_connect,
426         .cm_handle_connect      = rds_ib_cm_handle_connect,
427         .cm_connect_complete    = rds_ib_cm_connect_complete,
428         .stats_info_copy        = rds_ib_stats_info_copy,
429         .exit                   = rds_ib_exit,
430         .get_mr                 = rds_ib_get_mr,
431         .sync_mr                = rds_ib_sync_mr,
432         .free_mr                = rds_ib_free_mr,
433         .flush_mrs              = rds_ib_flush_mrs,
434         .t_owner                = THIS_MODULE,
435         .t_name                 = "infiniband",
436         .t_unloading            = rds_ib_is_unloading,
437         .t_type                 = RDS_TRANS_IB
438 };
439 
440 int rds_ib_init(void)
441 {
442         int ret;
443 
444         INIT_LIST_HEAD(&rds_ib_devices);
445 
446         ret = rds_ib_mr_init();
447         if (ret)
448                 goto out;
449 
450         ret = ib_register_client(&rds_ib_client);
451         if (ret)
452                 goto out_mr_exit;
453 
454         ret = rds_ib_sysctl_init();
455         if (ret)
456                 goto out_ibreg;
457 
458         ret = rds_ib_recv_init();
459         if (ret)
460                 goto out_sysctl;
461 
462         rds_trans_register(&rds_ib_transport);
463 
464         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
465 
466         goto out;
467 
468 out_sysctl:
469         rds_ib_sysctl_exit();
470 out_ibreg:
471         rds_ib_unregister_client();
472 out_mr_exit:
473         rds_ib_mr_exit();
474 out:
475         return ret;
476 }
477 
478 MODULE_LICENSE("GPL");
479 
480 

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