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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 static unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
 47 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
 48 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
 49 
 50 module_param(fmr_pool_size, int, 0444);
 51 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
 52 module_param(fmr_message_size, int, 0444);
 53 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
 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_pool)
101                 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
102         if (rds_ibdev->mr)
103                 ib_dereg_mr(rds_ibdev->mr);
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         struct ib_device_attr *dev_attr;
126 
127         /* Only handle IB (no iWARP) devices */
128         if (device->node_type != RDMA_NODE_IB_CA)
129                 return;
130 
131         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
132         if (!dev_attr)
133                 return;
134 
135         if (ib_query_device(device, dev_attr)) {
136                 rdsdebug("Query device failed for %s\n", device->name);
137                 goto free_attr;
138         }
139 
140         rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
141                                  ibdev_to_node(device));
142         if (!rds_ibdev)
143                 goto free_attr;
144 
145         spin_lock_init(&rds_ibdev->spinlock);
146         atomic_set(&rds_ibdev->refcount, 1);
147         INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
148 
149         rds_ibdev->max_wrs = dev_attr->max_qp_wr;
150         rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
151 
152         rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
153         rds_ibdev->max_fmrs = dev_attr->max_fmr ?
154                         min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
155                         fmr_pool_size;
156 
157         rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
158         rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
159 
160         rds_ibdev->dev = device;
161         rds_ibdev->pd = ib_alloc_pd(device);
162         if (IS_ERR(rds_ibdev->pd)) {
163                 rds_ibdev->pd = NULL;
164                 goto put_dev;
165         }
166 
167         rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, IB_ACCESS_LOCAL_WRITE);
168         if (IS_ERR(rds_ibdev->mr)) {
169                 rds_ibdev->mr = NULL;
170                 goto put_dev;
171         }
172 
173         rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
174         if (IS_ERR(rds_ibdev->mr_pool)) {
175                 rds_ibdev->mr_pool = NULL;
176                 goto put_dev;
177         }
178 
179         INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
180         INIT_LIST_HEAD(&rds_ibdev->conn_list);
181 
182         down_write(&rds_ib_devices_lock);
183         list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
184         up_write(&rds_ib_devices_lock);
185         atomic_inc(&rds_ibdev->refcount);
186 
187         ib_set_client_data(device, &rds_ib_client, rds_ibdev);
188         atomic_inc(&rds_ibdev->refcount);
189 
190         rds_ib_nodev_connect();
191 
192 put_dev:
193         rds_ib_dev_put(rds_ibdev);
194 free_attr:
195         kfree(dev_attr);
196 }
197 
198 /*
199  * New connections use this to find the device to associate with the
200  * connection.  It's not in the fast path so we're not concerned about the
201  * performance of the IB call.  (As of this writing, it uses an interrupt
202  * blocking spinlock to serialize walking a per-device list of all registered
203  * clients.)
204  *
205  * RCU is used to handle incoming connections racing with device teardown.
206  * Rather than use a lock to serialize removal from the client_data and
207  * getting a new reference, we use an RCU grace period.  The destruction
208  * path removes the device from client_data and then waits for all RCU
209  * readers to finish.
210  *
211  * A new connection can get NULL from this if its arriving on a
212  * device that is in the process of being removed.
213  */
214 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
215 {
216         struct rds_ib_device *rds_ibdev;
217 
218         rcu_read_lock();
219         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
220         if (rds_ibdev)
221                 atomic_inc(&rds_ibdev->refcount);
222         rcu_read_unlock();
223         return rds_ibdev;
224 }
225 
226 /*
227  * The IB stack is letting us know that a device is going away.  This can
228  * happen if the underlying HCA driver is removed or if PCI hotplug is removing
229  * the pci function, for example.
230  *
231  * This can be called at any time and can be racing with any other RDS path.
232  */
233 static void rds_ib_remove_one(struct ib_device *device)
234 {
235         struct rds_ib_device *rds_ibdev;
236 
237         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
238         if (!rds_ibdev)
239                 return;
240 
241         rds_ib_dev_shutdown(rds_ibdev);
242 
243         /* stop connection attempts from getting a reference to this device. */
244         ib_set_client_data(device, &rds_ib_client, NULL);
245 
246         down_write(&rds_ib_devices_lock);
247         list_del_rcu(&rds_ibdev->list);
248         up_write(&rds_ib_devices_lock);
249 
250         /*
251          * This synchronize rcu is waiting for readers of both the ib
252          * client data and the devices list to finish before we drop
253          * both of those references.
254          */
255         synchronize_rcu();
256         rds_ib_dev_put(rds_ibdev);
257         rds_ib_dev_put(rds_ibdev);
258 }
259 
260 struct ib_client rds_ib_client = {
261         .name   = "rds_ib",
262         .add    = rds_ib_add_one,
263         .remove = rds_ib_remove_one
264 };
265 
266 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
267                                     void *buffer)
268 {
269         struct rds_info_rdma_connection *iinfo = buffer;
270         struct rds_ib_connection *ic;
271 
272         /* We will only ever look at IB transports */
273         if (conn->c_trans != &rds_ib_transport)
274                 return 0;
275 
276         iinfo->src_addr = conn->c_laddr;
277         iinfo->dst_addr = conn->c_faddr;
278 
279         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
280         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
281         if (rds_conn_state(conn) == RDS_CONN_UP) {
282                 struct rds_ib_device *rds_ibdev;
283                 struct rdma_dev_addr *dev_addr;
284 
285                 ic = conn->c_transport_data;
286                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
287 
288                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
289                 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
290 
291                 rds_ibdev = ic->rds_ibdev;
292                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
293                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
294                 iinfo->max_send_sge = rds_ibdev->max_sge;
295                 rds_ib_get_mr_info(rds_ibdev, iinfo);
296         }
297         return 1;
298 }
299 
300 static void rds_ib_ic_info(struct socket *sock, unsigned int len,
301                            struct rds_info_iterator *iter,
302                            struct rds_info_lengths *lens)
303 {
304         rds_for_each_conn_info(sock, len, iter, lens,
305                                 rds_ib_conn_info_visitor,
306                                 sizeof(struct rds_info_rdma_connection));
307 }
308 
309 
310 /*
311  * Early RDS/IB was built to only bind to an address if there is an IPoIB
312  * device with that address set.
313  *
314  * If it were me, I'd advocate for something more flexible.  Sending and
315  * receiving should be device-agnostic.  Transports would try and maintain
316  * connections between peers who have messages queued.  Userspace would be
317  * allowed to influence which paths have priority.  We could call userspace
318  * asserting this policy "routing".
319  */
320 static int rds_ib_laddr_check(__be32 addr)
321 {
322         int ret;
323         struct rdma_cm_id *cm_id;
324         struct sockaddr_in sin;
325 
326         /* Create a CMA ID and try to bind it. This catches both
327          * IB and iWARP capable NICs.
328          */
329         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
330         if (IS_ERR(cm_id))
331                 return PTR_ERR(cm_id);
332 
333         memset(&sin, 0, sizeof(sin));
334         sin.sin_family = AF_INET;
335         sin.sin_addr.s_addr = addr;
336 
337         /* rdma_bind_addr will only succeed for IB & iWARP devices */
338         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
339         /* due to this, we will claim to support iWARP devices unless we
340            check node_type. */
341         if (ret || !cm_id->device ||
342             cm_id->device->node_type != RDMA_NODE_IB_CA)
343                 ret = -EADDRNOTAVAIL;
344 
345         rdsdebug("addr %pI4 ret %d node type %d\n",
346                 &addr, ret,
347                 cm_id->device ? cm_id->device->node_type : -1);
348 
349         rdma_destroy_id(cm_id);
350 
351         return ret;
352 }
353 
354 static void rds_ib_unregister_client(void)
355 {
356         ib_unregister_client(&rds_ib_client);
357         /* wait for rds_ib_dev_free() to complete */
358         flush_workqueue(rds_wq);
359 }
360 
361 void rds_ib_exit(void)
362 {
363         rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
364         rds_ib_unregister_client();
365         rds_ib_destroy_nodev_conns();
366         rds_ib_sysctl_exit();
367         rds_ib_recv_exit();
368         rds_trans_unregister(&rds_ib_transport);
369 }
370 
371 struct rds_transport rds_ib_transport = {
372         .laddr_check            = rds_ib_laddr_check,
373         .xmit_complete          = rds_ib_xmit_complete,
374         .xmit                   = rds_ib_xmit,
375         .xmit_rdma              = rds_ib_xmit_rdma,
376         .xmit_atomic            = rds_ib_xmit_atomic,
377         .recv                   = rds_ib_recv,
378         .conn_alloc             = rds_ib_conn_alloc,
379         .conn_free              = rds_ib_conn_free,
380         .conn_connect           = rds_ib_conn_connect,
381         .conn_shutdown          = rds_ib_conn_shutdown,
382         .inc_copy_to_user       = rds_ib_inc_copy_to_user,
383         .inc_free               = rds_ib_inc_free,
384         .cm_initiate_connect    = rds_ib_cm_initiate_connect,
385         .cm_handle_connect      = rds_ib_cm_handle_connect,
386         .cm_connect_complete    = rds_ib_cm_connect_complete,
387         .stats_info_copy        = rds_ib_stats_info_copy,
388         .exit                   = rds_ib_exit,
389         .get_mr                 = rds_ib_get_mr,
390         .sync_mr                = rds_ib_sync_mr,
391         .free_mr                = rds_ib_free_mr,
392         .flush_mrs              = rds_ib_flush_mrs,
393         .t_owner                = THIS_MODULE,
394         .t_name                 = "infiniband",
395         .t_type                 = RDS_TRANS_IB
396 };
397 
398 int rds_ib_init(void)
399 {
400         int ret;
401 
402         INIT_LIST_HEAD(&rds_ib_devices);
403 
404         ret = ib_register_client(&rds_ib_client);
405         if (ret)
406                 goto out;
407 
408         ret = rds_ib_sysctl_init();
409         if (ret)
410                 goto out_ibreg;
411 
412         ret = rds_ib_recv_init();
413         if (ret)
414                 goto out_sysctl;
415 
416         ret = rds_trans_register(&rds_ib_transport);
417         if (ret)
418                 goto out_recv;
419 
420         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
421 
422         goto out;
423 
424 out_recv:
425         rds_ib_recv_exit();
426 out_sysctl:
427         rds_ib_sysctl_exit();
428 out_ibreg:
429         rds_ib_unregister_client();
430 out:
431         return ret;
432 }
433 
434 MODULE_LICENSE("GPL");
435 
436 

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