blob: cd64ef9a47487e4dd30eebb7c4c83928c911061b [file] [log] [blame]
Andy Groverec162272009-02-24 15:30:30 +00001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040041#include <linux/module.h>
Andy Groverec162272009-02-24 15:30:30 +000042
43#include "rds.h"
44#include "ib.h"
45
stephen hemmingerff51bf82010-10-19 08:08:33 +000046static unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
Andy Groverec162272009-02-24 15:30:30 +000047unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
Andy Grover3ba23ad2009-07-17 13:13:22 +000048unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
Andy Groverec162272009-02-24 15:30:30 +000049
50module_param(fmr_pool_size, int, 0444);
51MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
52module_param(fmr_message_size, int, 0444);
53MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
Andy Grover3ba23ad2009-07-17 13:13:22 +000054module_param(rds_ib_retry_count, int, 0444);
55MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
Andy Groverec162272009-02-24 15:30:30 +000056
Zach Brownea819862010-07-15 12:34:33 -070057/*
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 */
62DECLARE_RWSEM(rds_ib_devices_lock);
Andy Groverec162272009-02-24 15:30:30 +000063struct list_head rds_ib_devices;
64
Andy Grover745cbcc2009-04-01 08:20:19 +000065/* NOTE: if also grabbing ibdev lock, grab this first */
Andy Groverec162272009-02-24 15:30:30 +000066DEFINE_SPINLOCK(ib_nodev_conns_lock);
67LIST_HEAD(ib_nodev_conns);
68
stephen hemmingerff51bf82010-10-19 08:08:33 +000069static void rds_ib_nodev_connect(void)
Zach Brownfc19de32010-05-24 13:16:57 -070070{
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
stephen hemmingerff51bf82010-10-19 08:08:33 +000079static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
Zach Brownfc19de32010-05-24 13:16:57 -070080{
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
Zach Brown3e0249f2010-05-18 15:48:51 -070090/*
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 */
94static 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);
Zach Brown3e0249f2010-05-18 15:48:51 -0700102 if (rds_ibdev->pd)
103 ib_dealloc_pd(rds_ibdev->pd);
104
105 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
106 list_del(&i_ipaddr->list);
107 kfree(i_ipaddr);
108 }
109
110 kfree(rds_ibdev);
111}
112
113void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
114{
115 BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
116 if (atomic_dec_and_test(&rds_ibdev->refcount))
117 queue_work(rds_wq, &rds_ibdev->free_work);
118}
119
stephen hemmingerff51bf82010-10-19 08:08:33 +0000120static void rds_ib_add_one(struct ib_device *device)
Andy Groverec162272009-02-24 15:30:30 +0000121{
122 struct rds_ib_device *rds_ibdev;
123 struct ib_device_attr *dev_attr;
124
125 /* Only handle IB (no iWARP) devices */
126 if (device->node_type != RDMA_NODE_IB_CA)
127 return;
128
129 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
130 if (!dev_attr)
131 return;
132
133 if (ib_query_device(device, dev_attr)) {
134 rdsdebug("Query device failed for %s\n", device->name);
135 goto free_attr;
136 }
137
Zach Brown3e0249f2010-05-18 15:48:51 -0700138 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
139 ibdev_to_node(device));
Andy Groverec162272009-02-24 15:30:30 +0000140 if (!rds_ibdev)
141 goto free_attr;
142
143 spin_lock_init(&rds_ibdev->spinlock);
Zach Brown3e0249f2010-05-18 15:48:51 -0700144 atomic_set(&rds_ibdev->refcount, 1);
145 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
Andy Groverec162272009-02-24 15:30:30 +0000146
147 rds_ibdev->max_wrs = dev_attr->max_qp_wr;
148 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
149
Andy Groverec162272009-02-24 15:30:30 +0000150 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
151 rds_ibdev->max_fmrs = dev_attr->max_fmr ?
152 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
153 fmr_pool_size;
154
Andy Grover40589e72010-01-12 10:50:48 -0800155 rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
156 rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
157
Andy Groverec162272009-02-24 15:30:30 +0000158 rds_ibdev->dev = device;
159 rds_ibdev->pd = ib_alloc_pd(device);
Zach Brown3e0249f2010-05-18 15:48:51 -0700160 if (IS_ERR(rds_ibdev->pd)) {
161 rds_ibdev->pd = NULL;
162 goto put_dev;
163 }
Andy Groverec162272009-02-24 15:30:30 +0000164
Andy Groverec162272009-02-24 15:30:30 +0000165 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
166 if (IS_ERR(rds_ibdev->mr_pool)) {
167 rds_ibdev->mr_pool = NULL;
Zach Brown3e0249f2010-05-18 15:48:51 -0700168 goto put_dev;
Andy Groverec162272009-02-24 15:30:30 +0000169 }
170
171 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
172 INIT_LIST_HEAD(&rds_ibdev->conn_list);
Zach Brownea819862010-07-15 12:34:33 -0700173
174 down_write(&rds_ib_devices_lock);
175 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
176 up_write(&rds_ib_devices_lock);
Zach Brown3e0249f2010-05-18 15:48:51 -0700177 atomic_inc(&rds_ibdev->refcount);
Andy Groverec162272009-02-24 15:30:30 +0000178
179 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
Zach Brown3e0249f2010-05-18 15:48:51 -0700180 atomic_inc(&rds_ibdev->refcount);
Andy Groverec162272009-02-24 15:30:30 +0000181
Zach Brownfc19de32010-05-24 13:16:57 -0700182 rds_ib_nodev_connect();
183
Zach Brown3e0249f2010-05-18 15:48:51 -0700184put_dev:
185 rds_ib_dev_put(rds_ibdev);
Andy Groverec162272009-02-24 15:30:30 +0000186free_attr:
187 kfree(dev_attr);
188}
189
Zach Brown3e0249f2010-05-18 15:48:51 -0700190/*
191 * New connections use this to find the device to associate with the
192 * connection. It's not in the fast path so we're not concerned about the
193 * performance of the IB call. (As of this writing, it uses an interrupt
194 * blocking spinlock to serialize walking a per-device list of all registered
195 * clients.)
196 *
197 * RCU is used to handle incoming connections racing with device teardown.
198 * Rather than use a lock to serialize removal from the client_data and
199 * getting a new reference, we use an RCU grace period. The destruction
200 * path removes the device from client_data and then waits for all RCU
201 * readers to finish.
202 *
203 * A new connection can get NULL from this if its arriving on a
204 * device that is in the process of being removed.
205 */
206struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
207{
208 struct rds_ib_device *rds_ibdev;
209
210 rcu_read_lock();
211 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
212 if (rds_ibdev)
213 atomic_inc(&rds_ibdev->refcount);
214 rcu_read_unlock();
215 return rds_ibdev;
216}
217
218/*
219 * The IB stack is letting us know that a device is going away. This can
220 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
221 * the pci function, for example.
222 *
223 * This can be called at any time and can be racing with any other RDS path.
224 */
Haggai Eran7c1eb452015-07-30 17:50:14 +0300225static void rds_ib_remove_one(struct ib_device *device, void *client_data)
Andy Groverec162272009-02-24 15:30:30 +0000226{
Haggai Eran7c1eb452015-07-30 17:50:14 +0300227 struct rds_ib_device *rds_ibdev = client_data;
Andy Groverec162272009-02-24 15:30:30 +0000228
Andy Groverec162272009-02-24 15:30:30 +0000229 if (!rds_ibdev)
230 return;
231
Zach Brownfc19de32010-05-24 13:16:57 -0700232 rds_ib_dev_shutdown(rds_ibdev);
Andy Groverec162272009-02-24 15:30:30 +0000233
Zach Brownea819862010-07-15 12:34:33 -0700234 /* stop connection attempts from getting a reference to this device. */
Zach Brown3e0249f2010-05-18 15:48:51 -0700235 ib_set_client_data(device, &rds_ib_client, NULL);
Zach Brownea819862010-07-15 12:34:33 -0700236
237 down_write(&rds_ib_devices_lock);
238 list_del_rcu(&rds_ibdev->list);
239 up_write(&rds_ib_devices_lock);
240
241 /*
242 * This synchronize rcu is waiting for readers of both the ib
243 * client data and the devices list to finish before we drop
244 * both of those references.
245 */
Zach Brown3e0249f2010-05-18 15:48:51 -0700246 synchronize_rcu();
247 rds_ib_dev_put(rds_ibdev);
Zach Brown3e0249f2010-05-18 15:48:51 -0700248 rds_ib_dev_put(rds_ibdev);
Andy Groverec162272009-02-24 15:30:30 +0000249}
250
251struct ib_client rds_ib_client = {
252 .name = "rds_ib",
253 .add = rds_ib_add_one,
254 .remove = rds_ib_remove_one
255};
256
257static int rds_ib_conn_info_visitor(struct rds_connection *conn,
258 void *buffer)
259{
260 struct rds_info_rdma_connection *iinfo = buffer;
261 struct rds_ib_connection *ic;
262
263 /* We will only ever look at IB transports */
264 if (conn->c_trans != &rds_ib_transport)
265 return 0;
266
267 iinfo->src_addr = conn->c_laddr;
268 iinfo->dst_addr = conn->c_faddr;
269
270 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
271 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
272 if (rds_conn_state(conn) == RDS_CONN_UP) {
273 struct rds_ib_device *rds_ibdev;
274 struct rdma_dev_addr *dev_addr;
275
276 ic = conn->c_transport_data;
277 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
278
Sean Hefty6f8372b2009-11-19 13:26:06 -0800279 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
280 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
Andy Groverec162272009-02-24 15:30:30 +0000281
Zach Brown3e0249f2010-05-18 15:48:51 -0700282 rds_ibdev = ic->rds_ibdev;
Andy Groverec162272009-02-24 15:30:30 +0000283 iinfo->max_send_wr = ic->i_send_ring.w_nr;
284 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
285 iinfo->max_send_sge = rds_ibdev->max_sge;
286 rds_ib_get_mr_info(rds_ibdev, iinfo);
287 }
288 return 1;
289}
290
291static void rds_ib_ic_info(struct socket *sock, unsigned int len,
292 struct rds_info_iterator *iter,
293 struct rds_info_lengths *lens)
294{
295 rds_for_each_conn_info(sock, len, iter, lens,
296 rds_ib_conn_info_visitor,
297 sizeof(struct rds_info_rdma_connection));
298}
299
300
301/*
302 * Early RDS/IB was built to only bind to an address if there is an IPoIB
303 * device with that address set.
304 *
305 * If it were me, I'd advocate for something more flexible. Sending and
306 * receiving should be device-agnostic. Transports would try and maintain
307 * connections between peers who have messages queued. Userspace would be
308 * allowed to influence which paths have priority. We could call userspace
309 * asserting this policy "routing".
310 */
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400311static int rds_ib_laddr_check(struct net *net, __be32 addr)
Andy Groverec162272009-02-24 15:30:30 +0000312{
313 int ret;
314 struct rdma_cm_id *cm_id;
315 struct sockaddr_in sin;
316
317 /* Create a CMA ID and try to bind it. This catches both
318 * IB and iWARP capable NICs.
319 */
Guy Shapirofa201052015-10-22 15:20:10 +0300320 cm_id = rdma_create_id(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
Dan Carpenter94713ba2009-04-09 14:09:46 +0000321 if (IS_ERR(cm_id))
322 return PTR_ERR(cm_id);
Andy Groverec162272009-02-24 15:30:30 +0000323
324 memset(&sin, 0, sizeof(sin));
325 sin.sin_family = AF_INET;
326 sin.sin_addr.s_addr = addr;
327
328 /* rdma_bind_addr will only succeed for IB & iWARP devices */
329 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
330 /* due to this, we will claim to support iWARP devices unless we
331 check node_type. */
Sasha Levinc2349752013-12-18 23:49:42 -0500332 if (ret || !cm_id->device ||
333 cm_id->device->node_type != RDMA_NODE_IB_CA)
Andy Groverec162272009-02-24 15:30:30 +0000334 ret = -EADDRNOTAVAIL;
335
336 rdsdebug("addr %pI4 ret %d node type %d\n",
337 &addr, ret,
338 cm_id->device ? cm_id->device->node_type : -1);
339
340 rdma_destroy_id(cm_id);
341
342 return ret;
343}
344
Zach Brown24fa1632010-06-25 14:59:49 -0700345static void rds_ib_unregister_client(void)
346{
347 ib_unregister_client(&rds_ib_client);
348 /* wait for rds_ib_dev_free() to complete */
349 flush_workqueue(rds_wq);
350}
351
Andy Groverec162272009-02-24 15:30:30 +0000352void rds_ib_exit(void)
353{
354 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
Zach Brown24fa1632010-06-25 14:59:49 -0700355 rds_ib_unregister_client();
Zach Brown8aeb1ba2010-06-25 14:58:16 -0700356 rds_ib_destroy_nodev_conns();
Andy Groverec162272009-02-24 15:30:30 +0000357 rds_ib_sysctl_exit();
358 rds_ib_recv_exit();
359 rds_trans_unregister(&rds_ib_transport);
santosh.shilimkar@oracle.comad1d7dc2015-08-25 12:02:01 -0700360 rds_ib_fmr_exit();
Andy Groverec162272009-02-24 15:30:30 +0000361}
362
363struct rds_transport rds_ib_transport = {
364 .laddr_check = rds_ib_laddr_check,
365 .xmit_complete = rds_ib_xmit_complete,
366 .xmit = rds_ib_xmit,
Andy Groverec162272009-02-24 15:30:30 +0000367 .xmit_rdma = rds_ib_xmit_rdma,
Andy Grover15133f62010-01-12 14:33:38 -0800368 .xmit_atomic = rds_ib_xmit_atomic,
Andy Groverec162272009-02-24 15:30:30 +0000369 .recv = rds_ib_recv,
370 .conn_alloc = rds_ib_conn_alloc,
371 .conn_free = rds_ib_conn_free,
372 .conn_connect = rds_ib_conn_connect,
373 .conn_shutdown = rds_ib_conn_shutdown,
374 .inc_copy_to_user = rds_ib_inc_copy_to_user,
Andy Groverec162272009-02-24 15:30:30 +0000375 .inc_free = rds_ib_inc_free,
376 .cm_initiate_connect = rds_ib_cm_initiate_connect,
377 .cm_handle_connect = rds_ib_cm_handle_connect,
378 .cm_connect_complete = rds_ib_cm_connect_complete,
379 .stats_info_copy = rds_ib_stats_info_copy,
380 .exit = rds_ib_exit,
381 .get_mr = rds_ib_get_mr,
382 .sync_mr = rds_ib_sync_mr,
383 .free_mr = rds_ib_free_mr,
384 .flush_mrs = rds_ib_flush_mrs,
385 .t_owner = THIS_MODULE,
386 .t_name = "infiniband",
Andy Grover335776b2009-08-21 12:28:34 +0000387 .t_type = RDS_TRANS_IB
Andy Groverec162272009-02-24 15:30:30 +0000388};
389
Zach Brownef87b7e2010-07-09 12:26:20 -0700390int rds_ib_init(void)
Andy Groverec162272009-02-24 15:30:30 +0000391{
392 int ret;
393
394 INIT_LIST_HEAD(&rds_ib_devices);
395
santosh.shilimkar@oracle.comad1d7dc2015-08-25 12:02:01 -0700396 ret = rds_ib_fmr_init();
Zach Brown515e0792010-07-06 15:09:56 -0700397 if (ret)
Tejun Heoc534a102011-02-01 11:42:43 +0100398 goto out;
Zach Brown515e0792010-07-06 15:09:56 -0700399
santosh.shilimkar@oracle.comad1d7dc2015-08-25 12:02:01 -0700400 ret = ib_register_client(&rds_ib_client);
401 if (ret)
402 goto out_fmr_exit;
403
Andy Groverec162272009-02-24 15:30:30 +0000404 ret = rds_ib_sysctl_init();
405 if (ret)
406 goto out_ibreg;
407
408 ret = rds_ib_recv_init();
409 if (ret)
410 goto out_sysctl;
411
412 ret = rds_trans_register(&rds_ib_transport);
413 if (ret)
414 goto out_recv;
415
416 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
417
418 goto out;
419
420out_recv:
421 rds_ib_recv_exit();
422out_sysctl:
423 rds_ib_sysctl_exit();
424out_ibreg:
Zach Brown24fa1632010-06-25 14:59:49 -0700425 rds_ib_unregister_client();
santosh.shilimkar@oracle.comad1d7dc2015-08-25 12:02:01 -0700426out_fmr_exit:
427 rds_ib_fmr_exit();
Andy Groverec162272009-02-24 15:30:30 +0000428out:
429 return ret;
430}
431
432MODULE_LICENSE("GPL");
433