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ec16227e AG |
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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
3a9a231d | 41 | #include <linux/module.h> |
ec16227e AG |
42 | |
43 | #include "rds.h" | |
44 | #include "ib.h" | |
45 | ||
06766513 SS |
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; | |
3ba23ade | 48 | unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT; |
ec16227e | 49 | |
06766513 SS |
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"); | |
3ba23ade AG |
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"); | |
ec16227e | 56 | |
ea819867 ZB |
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); | |
ec16227e AG |
63 | struct list_head rds_ib_devices; |
64 | ||
745cbcca | 65 | /* NOTE: if also grabbing ibdev lock, grab this first */ |
ec16227e AG |
66 | DEFINE_SPINLOCK(ib_nodev_conns_lock); |
67 | LIST_HEAD(ib_nodev_conns); | |
68 | ||
ff51bf84 | 69 | static void rds_ib_nodev_connect(void) |
fc19de38 ZB |
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 | ||
ff51bf84 | 79 | static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev) |
fc19de38 ZB |
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 | ||
3e0249f9 ZB |
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 | ||
06766513 SS |
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); | |
3e0249f9 ZB |
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 | ||
ff51bf84 | 122 | static void rds_ib_add_one(struct ib_device *device) |
ec16227e AG |
123 | { |
124 | struct rds_ib_device *rds_ibdev; | |
ec16227e AG |
125 | |
126 | /* Only handle IB (no iWARP) devices */ | |
127 | if (device->node_type != RDMA_NODE_IB_CA) | |
128 | return; | |
129 | ||
3e0249f9 ZB |
130 | rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL, |
131 | ibdev_to_node(device)); | |
ec16227e | 132 | if (!rds_ibdev) |
0353261c | 133 | return; |
ec16227e AG |
134 | |
135 | spin_lock_init(&rds_ibdev->spinlock); | |
3e0249f9 ZB |
136 | atomic_set(&rds_ibdev->refcount, 1); |
137 | INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); | |
ec16227e | 138 | |
0353261c OG |
139 | rds_ibdev->max_wrs = device->attrs.max_qp_wr; |
140 | rds_ibdev->max_sge = min(device->attrs.max_sge, RDS_IB_MAX_SGE); | |
ec16227e | 141 | |
0353261c OG |
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), | |
06766513 SS |
145 | rds_ib_fmr_1m_pool_size) : rds_ib_fmr_1m_pool_size; |
146 | ||
0353261c OG |
147 | rds_ibdev->max_8k_fmrs = device->attrs.max_mr ? |
148 | min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE), | |
06766513 | 149 | rds_ib_fmr_8k_pool_size) : rds_ib_fmr_8k_pool_size; |
ec16227e | 150 | |
0353261c OG |
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; | |
40589e74 | 153 | |
ec16227e AG |
154 | rds_ibdev->dev = device; |
155 | rds_ibdev->pd = ib_alloc_pd(device); | |
3e0249f9 ZB |
156 | if (IS_ERR(rds_ibdev->pd)) { |
157 | rds_ibdev->pd = NULL; | |
158 | goto put_dev; | |
159 | } | |
ec16227e | 160 | |
06766513 SS |
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; | |
3e0249f9 | 165 | goto put_dev; |
ec16227e AG |
166 | } |
167 | ||
06766513 SS |
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", | |
0353261c | 176 | device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge, |
06766513 SS |
177 | rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_fmrs, |
178 | rds_ibdev->max_8k_fmrs); | |
179 | ||
ec16227e AG |
180 | INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); |
181 | INIT_LIST_HEAD(&rds_ibdev->conn_list); | |
ea819867 ZB |
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); | |
3e0249f9 | 186 | atomic_inc(&rds_ibdev->refcount); |
ec16227e AG |
187 | |
188 | ib_set_client_data(device, &rds_ib_client, rds_ibdev); | |
3e0249f9 | 189 | atomic_inc(&rds_ibdev->refcount); |
ec16227e | 190 | |
fc19de38 ZB |
191 | rds_ib_nodev_connect(); |
192 | ||
3e0249f9 ZB |
193 | put_dev: |
194 | rds_ib_dev_put(rds_ibdev); | |
ec16227e AG |
195 | } |
196 | ||
3e0249f9 ZB |
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 | */ | |
7c1eb45a | 232 | static void rds_ib_remove_one(struct ib_device *device, void *client_data) |
ec16227e | 233 | { |
7c1eb45a | 234 | struct rds_ib_device *rds_ibdev = client_data; |
ec16227e | 235 | |
ec16227e AG |
236 | if (!rds_ibdev) |
237 | return; | |
238 | ||
fc19de38 | 239 | rds_ib_dev_shutdown(rds_ibdev); |
ec16227e | 240 | |
ea819867 ZB |
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 | ||
3e0249f9 | 248 | /* |
ea819867 ZB |
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. | |
3e0249f9 | 252 | */ |
3e0249f9 ZB |
253 | synchronize_rcu(); |
254 | rds_ib_dev_put(rds_ibdev); | |
3e0249f9 | 255 | rds_ib_dev_put(rds_ibdev); |
ec16227e AG |
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 | ||
6f8372b6 SH |
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); | |
ec16227e | 288 | |
3e0249f9 | 289 | rds_ibdev = ic->rds_ibdev; |
ec16227e AG |
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 | */ | |
d5a8ac28 | 318 | static int rds_ib_laddr_check(struct net *net, __be32 addr) |
ec16227e AG |
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 | */ | |
fa20105e | 327 | cm_id = rdma_create_id(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC); |
94713bab DC |
328 | if (IS_ERR(cm_id)) |
329 | return PTR_ERR(cm_id); | |
ec16227e AG |
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. */ | |
c2349758 SL |
339 | if (ret || !cm_id->device || |
340 | cm_id->device->node_type != RDMA_NODE_IB_CA) | |
ec16227e AG |
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 | ||
24fa163a ZB |
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 | ||
ec16227e AG |
359 | void rds_ib_exit(void) |
360 | { | |
361 | rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); | |
24fa163a | 362 | rds_ib_unregister_client(); |
8aeb1ba6 | 363 | rds_ib_destroy_nodev_conns(); |
ec16227e AG |
364 | rds_ib_sysctl_exit(); |
365 | rds_ib_recv_exit(); | |
366 | rds_trans_unregister(&rds_ib_transport); | |
ad1d7dc0 | 367 | rds_ib_fmr_exit(); |
ec16227e AG |
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, | |
ec16227e | 374 | .xmit_rdma = rds_ib_xmit_rdma, |
15133f6e | 375 | .xmit_atomic = rds_ib_xmit_atomic, |
ec16227e AG |
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, | |
ec16227e AG |
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", | |
335776bd | 394 | .t_type = RDS_TRANS_IB |
ec16227e AG |
395 | }; |
396 | ||
ef87b7ea | 397 | int rds_ib_init(void) |
ec16227e AG |
398 | { |
399 | int ret; | |
400 | ||
401 | INIT_LIST_HEAD(&rds_ib_devices); | |
402 | ||
ad1d7dc0 | 403 | ret = rds_ib_fmr_init(); |
515e079d | 404 | if (ret) |
c534a107 | 405 | goto out; |
515e079d | 406 | |
ad1d7dc0 | 407 | ret = ib_register_client(&rds_ib_client); |
408 | if (ret) | |
409 | goto out_fmr_exit; | |
410 | ||
ec16227e AG |
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: | |
24fa163a | 432 | rds_ib_unregister_client(); |
ad1d7dc0 | 433 | out_fmr_exit: |
434 | rds_ib_fmr_exit(); | |
ec16227e AG |
435 | out: |
436 | return ret; | |
437 | } | |
438 | ||
439 | MODULE_LICENSE("GPL"); | |
440 |