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fcd8b7c0 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> | |
40 | ||
41 | #include "rds.h" | |
42 | #include "iw.h" | |
43 | ||
44 | unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE; | |
45 | unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */ | |
46 | ||
47 | module_param(fastreg_pool_size, int, 0444); | |
48 | MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device"); | |
49 | module_param(fastreg_message_size, int, 0444); | |
50 | MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)"); | |
51 | ||
52 | struct list_head rds_iw_devices; | |
53 | ||
54 | DEFINE_SPINLOCK(iw_nodev_conns_lock); | |
55 | LIST_HEAD(iw_nodev_conns); | |
56 | ||
57 | void rds_iw_add_one(struct ib_device *device) | |
58 | { | |
59 | struct rds_iw_device *rds_iwdev; | |
60 | struct ib_device_attr *dev_attr; | |
61 | ||
62 | /* Only handle iwarp devices */ | |
63 | if (device->node_type != RDMA_NODE_RNIC) | |
64 | return; | |
65 | ||
66 | dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); | |
67 | if (!dev_attr) | |
68 | return; | |
69 | ||
70 | if (ib_query_device(device, dev_attr)) { | |
71 | rdsdebug("Query device failed for %s\n", device->name); | |
72 | goto free_attr; | |
73 | } | |
74 | ||
75 | rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL); | |
76 | if (!rds_iwdev) | |
77 | goto free_attr; | |
78 | ||
79 | spin_lock_init(&rds_iwdev->spinlock); | |
80 | ||
81 | rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY); | |
82 | rds_iwdev->max_wrs = dev_attr->max_qp_wr; | |
83 | rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE); | |
84 | ||
85 | rds_iwdev->page_shift = max(PAGE_SHIFT, ffs(dev_attr->page_size_cap) - 1); | |
86 | ||
87 | rds_iwdev->dev = device; | |
88 | rds_iwdev->pd = ib_alloc_pd(device); | |
89 | if (IS_ERR(rds_iwdev->pd)) | |
90 | goto free_dev; | |
91 | ||
92 | if (!rds_iwdev->dma_local_lkey) { | |
93 | if (device->node_type != RDMA_NODE_RNIC) { | |
94 | rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, | |
95 | IB_ACCESS_LOCAL_WRITE); | |
96 | } else { | |
97 | rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, | |
98 | IB_ACCESS_REMOTE_READ | | |
99 | IB_ACCESS_REMOTE_WRITE | | |
100 | IB_ACCESS_LOCAL_WRITE); | |
101 | } | |
102 | if (IS_ERR(rds_iwdev->mr)) | |
103 | goto err_pd; | |
104 | } else | |
105 | rds_iwdev->mr = NULL; | |
106 | ||
107 | rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev); | |
108 | if (IS_ERR(rds_iwdev->mr_pool)) { | |
109 | rds_iwdev->mr_pool = NULL; | |
110 | goto err_mr; | |
111 | } | |
112 | ||
113 | INIT_LIST_HEAD(&rds_iwdev->cm_id_list); | |
114 | INIT_LIST_HEAD(&rds_iwdev->conn_list); | |
115 | list_add_tail(&rds_iwdev->list, &rds_iw_devices); | |
116 | ||
117 | ib_set_client_data(device, &rds_iw_client, rds_iwdev); | |
118 | ||
119 | goto free_attr; | |
120 | ||
121 | err_mr: | |
122 | if (rds_iwdev->mr) | |
123 | ib_dereg_mr(rds_iwdev->mr); | |
124 | err_pd: | |
125 | ib_dealloc_pd(rds_iwdev->pd); | |
126 | free_dev: | |
127 | kfree(rds_iwdev); | |
128 | free_attr: | |
129 | kfree(dev_attr); | |
130 | } | |
131 | ||
132 | void rds_iw_remove_one(struct ib_device *device) | |
133 | { | |
134 | struct rds_iw_device *rds_iwdev; | |
135 | struct rds_iw_cm_id *i_cm_id, *next; | |
136 | ||
137 | rds_iwdev = ib_get_client_data(device, &rds_iw_client); | |
138 | if (!rds_iwdev) | |
139 | return; | |
140 | ||
141 | spin_lock_irq(&rds_iwdev->spinlock); | |
142 | list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) { | |
143 | list_del(&i_cm_id->list); | |
144 | kfree(i_cm_id); | |
145 | } | |
146 | spin_unlock_irq(&rds_iwdev->spinlock); | |
147 | ||
148 | rds_iw_remove_conns(rds_iwdev); | |
149 | ||
150 | if (rds_iwdev->mr_pool) | |
151 | rds_iw_destroy_mr_pool(rds_iwdev->mr_pool); | |
152 | ||
153 | if (rds_iwdev->mr) | |
154 | ib_dereg_mr(rds_iwdev->mr); | |
155 | ||
156 | while (ib_dealloc_pd(rds_iwdev->pd)) { | |
157 | rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd); | |
158 | msleep(1); | |
159 | } | |
160 | ||
161 | list_del(&rds_iwdev->list); | |
162 | kfree(rds_iwdev); | |
163 | } | |
164 | ||
165 | struct ib_client rds_iw_client = { | |
166 | .name = "rds_iw", | |
167 | .add = rds_iw_add_one, | |
168 | .remove = rds_iw_remove_one | |
169 | }; | |
170 | ||
171 | static int rds_iw_conn_info_visitor(struct rds_connection *conn, | |
172 | void *buffer) | |
173 | { | |
174 | struct rds_info_rdma_connection *iinfo = buffer; | |
175 | struct rds_iw_connection *ic; | |
176 | ||
177 | /* We will only ever look at IB transports */ | |
178 | if (conn->c_trans != &rds_iw_transport) | |
179 | return 0; | |
180 | ||
181 | iinfo->src_addr = conn->c_laddr; | |
182 | iinfo->dst_addr = conn->c_faddr; | |
183 | ||
184 | memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); | |
185 | memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); | |
186 | if (rds_conn_state(conn) == RDS_CONN_UP) { | |
187 | struct rds_iw_device *rds_iwdev; | |
188 | struct rdma_dev_addr *dev_addr; | |
189 | ||
190 | ic = conn->c_transport_data; | |
191 | dev_addr = &ic->i_cm_id->route.addr.dev_addr; | |
192 | ||
193 | ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); | |
194 | ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); | |
195 | ||
196 | rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); | |
197 | iinfo->max_send_wr = ic->i_send_ring.w_nr; | |
198 | iinfo->max_recv_wr = ic->i_recv_ring.w_nr; | |
199 | iinfo->max_send_sge = rds_iwdev->max_sge; | |
200 | rds_iw_get_mr_info(rds_iwdev, iinfo); | |
201 | } | |
202 | return 1; | |
203 | } | |
204 | ||
205 | static void rds_iw_ic_info(struct socket *sock, unsigned int len, | |
206 | struct rds_info_iterator *iter, | |
207 | struct rds_info_lengths *lens) | |
208 | { | |
209 | rds_for_each_conn_info(sock, len, iter, lens, | |
210 | rds_iw_conn_info_visitor, | |
211 | sizeof(struct rds_info_rdma_connection)); | |
212 | } | |
213 | ||
214 | ||
215 | /* | |
216 | * Early RDS/IB was built to only bind to an address if there is an IPoIB | |
217 | * device with that address set. | |
218 | * | |
219 | * If it were me, I'd advocate for something more flexible. Sending and | |
220 | * receiving should be device-agnostic. Transports would try and maintain | |
221 | * connections between peers who have messages queued. Userspace would be | |
222 | * allowed to influence which paths have priority. We could call userspace | |
223 | * asserting this policy "routing". | |
224 | */ | |
225 | static int rds_iw_laddr_check(__be32 addr) | |
226 | { | |
227 | int ret; | |
228 | struct rdma_cm_id *cm_id; | |
229 | struct sockaddr_in sin; | |
230 | ||
231 | /* Create a CMA ID and try to bind it. This catches both | |
232 | * IB and iWARP capable NICs. | |
233 | */ | |
234 | cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); | |
235 | if (!cm_id) | |
236 | return -EADDRNOTAVAIL; | |
237 | ||
238 | memset(&sin, 0, sizeof(sin)); | |
239 | sin.sin_family = AF_INET; | |
240 | sin.sin_addr.s_addr = addr; | |
241 | ||
242 | /* rdma_bind_addr will only succeed for IB & iWARP devices */ | |
243 | ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); | |
244 | /* due to this, we will claim to support IB devices unless we | |
245 | check node_type. */ | |
246 | if (ret || cm_id->device->node_type != RDMA_NODE_RNIC) | |
247 | ret = -EADDRNOTAVAIL; | |
248 | ||
249 | rdsdebug("addr %pI4 ret %d node type %d\n", | |
250 | &addr, ret, | |
251 | cm_id->device ? cm_id->device->node_type : -1); | |
252 | ||
253 | rdma_destroy_id(cm_id); | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | void rds_iw_exit(void) | |
259 | { | |
260 | rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); | |
261 | rds_iw_remove_nodev_conns(); | |
262 | ib_unregister_client(&rds_iw_client); | |
263 | rds_iw_sysctl_exit(); | |
264 | rds_iw_recv_exit(); | |
265 | rds_trans_unregister(&rds_iw_transport); | |
266 | } | |
267 | ||
268 | struct rds_transport rds_iw_transport = { | |
269 | .laddr_check = rds_iw_laddr_check, | |
270 | .xmit_complete = rds_iw_xmit_complete, | |
271 | .xmit = rds_iw_xmit, | |
272 | .xmit_cong_map = NULL, | |
273 | .xmit_rdma = rds_iw_xmit_rdma, | |
274 | .recv = rds_iw_recv, | |
275 | .conn_alloc = rds_iw_conn_alloc, | |
276 | .conn_free = rds_iw_conn_free, | |
277 | .conn_connect = rds_iw_conn_connect, | |
278 | .conn_shutdown = rds_iw_conn_shutdown, | |
279 | .inc_copy_to_user = rds_iw_inc_copy_to_user, | |
280 | .inc_purge = rds_iw_inc_purge, | |
281 | .inc_free = rds_iw_inc_free, | |
282 | .cm_initiate_connect = rds_iw_cm_initiate_connect, | |
283 | .cm_handle_connect = rds_iw_cm_handle_connect, | |
284 | .cm_connect_complete = rds_iw_cm_connect_complete, | |
285 | .stats_info_copy = rds_iw_stats_info_copy, | |
286 | .exit = rds_iw_exit, | |
287 | .get_mr = rds_iw_get_mr, | |
288 | .sync_mr = rds_iw_sync_mr, | |
289 | .free_mr = rds_iw_free_mr, | |
290 | .flush_mrs = rds_iw_flush_mrs, | |
291 | .t_owner = THIS_MODULE, | |
292 | .t_name = "iwarp", | |
293 | .t_prefer_loopback = 1, | |
294 | }; | |
295 | ||
296 | int __init rds_iw_init(void) | |
297 | { | |
298 | int ret; | |
299 | ||
300 | INIT_LIST_HEAD(&rds_iw_devices); | |
301 | ||
302 | ret = ib_register_client(&rds_iw_client); | |
303 | if (ret) | |
304 | goto out; | |
305 | ||
306 | ret = rds_iw_sysctl_init(); | |
307 | if (ret) | |
308 | goto out_ibreg; | |
309 | ||
310 | ret = rds_iw_recv_init(); | |
311 | if (ret) | |
312 | goto out_sysctl; | |
313 | ||
314 | ret = rds_trans_register(&rds_iw_transport); | |
315 | if (ret) | |
316 | goto out_recv; | |
317 | ||
318 | rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); | |
319 | ||
320 | goto out; | |
321 | ||
322 | out_recv: | |
323 | rds_iw_recv_exit(); | |
324 | out_sysctl: | |
325 | rds_iw_sysctl_exit(); | |
326 | out_ibreg: | |
327 | ib_unregister_client(&rds_iw_client); | |
328 | out: | |
329 | return ret; | |
330 | } | |
331 | ||
332 | MODULE_LICENSE("GPL"); | |
333 |