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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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
3a9a231d | 41 | #include <linux/module.h> |
fcd8b7c0 AG |
42 | |
43 | #include "rds.h" | |
44 | #include "iw.h" | |
45 | ||
46 | unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE; | |
47 | unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */ | |
48 | ||
49 | module_param(fastreg_pool_size, int, 0444); | |
50 | MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device"); | |
51 | module_param(fastreg_message_size, int, 0444); | |
52 | MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)"); | |
53 | ||
54 | struct list_head rds_iw_devices; | |
55 | ||
745cbcca | 56 | /* NOTE: if also grabbing iwdev lock, grab this first */ |
fcd8b7c0 AG |
57 | DEFINE_SPINLOCK(iw_nodev_conns_lock); |
58 | LIST_HEAD(iw_nodev_conns); | |
59 | ||
ff51bf84 | 60 | static void rds_iw_add_one(struct ib_device *device) |
fcd8b7c0 AG |
61 | { |
62 | struct rds_iw_device *rds_iwdev; | |
fcd8b7c0 AG |
63 | |
64 | /* Only handle iwarp devices */ | |
65 | if (device->node_type != RDMA_NODE_RNIC) | |
66 | return; | |
67 | ||
fcd8b7c0 AG |
68 | rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL); |
69 | if (!rds_iwdev) | |
0353261c | 70 | return; |
fcd8b7c0 AG |
71 | |
72 | spin_lock_init(&rds_iwdev->spinlock); | |
73 | ||
0353261c OG |
74 | rds_iwdev->dma_local_lkey = !!(device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY); |
75 | rds_iwdev->max_wrs = device->attrs.max_qp_wr; | |
76 | rds_iwdev->max_sge = min(device->attrs.max_sge, RDS_IW_MAX_SGE); | |
fcd8b7c0 | 77 | |
fcd8b7c0 AG |
78 | rds_iwdev->dev = device; |
79 | rds_iwdev->pd = ib_alloc_pd(device); | |
80 | if (IS_ERR(rds_iwdev->pd)) | |
81 | goto free_dev; | |
82 | ||
83 | if (!rds_iwdev->dma_local_lkey) { | |
ed9e352a AG |
84 | rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, |
85 | IB_ACCESS_REMOTE_READ | | |
86 | IB_ACCESS_REMOTE_WRITE | | |
87 | IB_ACCESS_LOCAL_WRITE); | |
fcd8b7c0 AG |
88 | if (IS_ERR(rds_iwdev->mr)) |
89 | goto err_pd; | |
90 | } else | |
91 | rds_iwdev->mr = NULL; | |
92 | ||
93 | rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev); | |
94 | if (IS_ERR(rds_iwdev->mr_pool)) { | |
95 | rds_iwdev->mr_pool = NULL; | |
96 | goto err_mr; | |
97 | } | |
98 | ||
99 | INIT_LIST_HEAD(&rds_iwdev->cm_id_list); | |
100 | INIT_LIST_HEAD(&rds_iwdev->conn_list); | |
101 | list_add_tail(&rds_iwdev->list, &rds_iw_devices); | |
102 | ||
103 | ib_set_client_data(device, &rds_iw_client, rds_iwdev); | |
0353261c | 104 | return; |
fcd8b7c0 AG |
105 | |
106 | err_mr: | |
107 | if (rds_iwdev->mr) | |
108 | ib_dereg_mr(rds_iwdev->mr); | |
109 | err_pd: | |
110 | ib_dealloc_pd(rds_iwdev->pd); | |
111 | free_dev: | |
112 | kfree(rds_iwdev); | |
fcd8b7c0 AG |
113 | } |
114 | ||
7c1eb45a | 115 | static void rds_iw_remove_one(struct ib_device *device, void *client_data) |
fcd8b7c0 | 116 | { |
7c1eb45a | 117 | struct rds_iw_device *rds_iwdev = client_data; |
fcd8b7c0 AG |
118 | struct rds_iw_cm_id *i_cm_id, *next; |
119 | ||
fcd8b7c0 AG |
120 | if (!rds_iwdev) |
121 | return; | |
122 | ||
123 | spin_lock_irq(&rds_iwdev->spinlock); | |
124 | list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) { | |
125 | list_del(&i_cm_id->list); | |
126 | kfree(i_cm_id); | |
127 | } | |
128 | spin_unlock_irq(&rds_iwdev->spinlock); | |
129 | ||
745cbcca | 130 | rds_iw_destroy_conns(rds_iwdev); |
fcd8b7c0 AG |
131 | |
132 | if (rds_iwdev->mr_pool) | |
133 | rds_iw_destroy_mr_pool(rds_iwdev->mr_pool); | |
134 | ||
135 | if (rds_iwdev->mr) | |
136 | ib_dereg_mr(rds_iwdev->mr); | |
137 | ||
7dd78647 | 138 | ib_dealloc_pd(rds_iwdev->pd); |
fcd8b7c0 AG |
139 | |
140 | list_del(&rds_iwdev->list); | |
141 | kfree(rds_iwdev); | |
142 | } | |
143 | ||
144 | struct ib_client rds_iw_client = { | |
145 | .name = "rds_iw", | |
146 | .add = rds_iw_add_one, | |
147 | .remove = rds_iw_remove_one | |
148 | }; | |
149 | ||
150 | static int rds_iw_conn_info_visitor(struct rds_connection *conn, | |
151 | void *buffer) | |
152 | { | |
153 | struct rds_info_rdma_connection *iinfo = buffer; | |
154 | struct rds_iw_connection *ic; | |
155 | ||
156 | /* We will only ever look at IB transports */ | |
157 | if (conn->c_trans != &rds_iw_transport) | |
158 | return 0; | |
159 | ||
160 | iinfo->src_addr = conn->c_laddr; | |
161 | iinfo->dst_addr = conn->c_faddr; | |
162 | ||
163 | memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); | |
164 | memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); | |
165 | if (rds_conn_state(conn) == RDS_CONN_UP) { | |
166 | struct rds_iw_device *rds_iwdev; | |
167 | struct rdma_dev_addr *dev_addr; | |
168 | ||
169 | ic = conn->c_transport_data; | |
170 | dev_addr = &ic->i_cm_id->route.addr.dev_addr; | |
171 | ||
6f8372b6 SH |
172 | rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); |
173 | rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); | |
fcd8b7c0 AG |
174 | |
175 | rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); | |
176 | iinfo->max_send_wr = ic->i_send_ring.w_nr; | |
177 | iinfo->max_recv_wr = ic->i_recv_ring.w_nr; | |
178 | iinfo->max_send_sge = rds_iwdev->max_sge; | |
179 | rds_iw_get_mr_info(rds_iwdev, iinfo); | |
180 | } | |
181 | return 1; | |
182 | } | |
183 | ||
184 | static void rds_iw_ic_info(struct socket *sock, unsigned int len, | |
185 | struct rds_info_iterator *iter, | |
186 | struct rds_info_lengths *lens) | |
187 | { | |
188 | rds_for_each_conn_info(sock, len, iter, lens, | |
189 | rds_iw_conn_info_visitor, | |
190 | sizeof(struct rds_info_rdma_connection)); | |
191 | } | |
192 | ||
193 | ||
194 | /* | |
195 | * Early RDS/IB was built to only bind to an address if there is an IPoIB | |
196 | * device with that address set. | |
197 | * | |
198 | * If it were me, I'd advocate for something more flexible. Sending and | |
199 | * receiving should be device-agnostic. Transports would try and maintain | |
200 | * connections between peers who have messages queued. Userspace would be | |
201 | * allowed to influence which paths have priority. We could call userspace | |
202 | * asserting this policy "routing". | |
203 | */ | |
d5a8ac28 | 204 | static int rds_iw_laddr_check(struct net *net, __be32 addr) |
fcd8b7c0 AG |
205 | { |
206 | int ret; | |
207 | struct rdma_cm_id *cm_id; | |
208 | struct sockaddr_in sin; | |
209 | ||
210 | /* Create a CMA ID and try to bind it. This catches both | |
211 | * IB and iWARP capable NICs. | |
212 | */ | |
fa20105e | 213 | cm_id = rdma_create_id(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC); |
5d57eeb5 DC |
214 | if (IS_ERR(cm_id)) |
215 | return PTR_ERR(cm_id); | |
fcd8b7c0 AG |
216 | |
217 | memset(&sin, 0, sizeof(sin)); | |
218 | sin.sin_family = AF_INET; | |
219 | sin.sin_addr.s_addr = addr; | |
220 | ||
221 | /* rdma_bind_addr will only succeed for IB & iWARP devices */ | |
222 | ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); | |
223 | /* due to this, we will claim to support IB devices unless we | |
224 | check node_type. */ | |
bf39b424 SL |
225 | if (ret || !cm_id->device || |
226 | cm_id->device->node_type != RDMA_NODE_RNIC) | |
fcd8b7c0 AG |
227 | ret = -EADDRNOTAVAIL; |
228 | ||
229 | rdsdebug("addr %pI4 ret %d node type %d\n", | |
230 | &addr, ret, | |
231 | cm_id->device ? cm_id->device->node_type : -1); | |
232 | ||
233 | rdma_destroy_id(cm_id); | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
238 | void rds_iw_exit(void) | |
239 | { | |
240 | rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); | |
745cbcca | 241 | rds_iw_destroy_nodev_conns(); |
fcd8b7c0 AG |
242 | ib_unregister_client(&rds_iw_client); |
243 | rds_iw_sysctl_exit(); | |
244 | rds_iw_recv_exit(); | |
245 | rds_trans_unregister(&rds_iw_transport); | |
246 | } | |
247 | ||
248 | struct rds_transport rds_iw_transport = { | |
249 | .laddr_check = rds_iw_laddr_check, | |
250 | .xmit_complete = rds_iw_xmit_complete, | |
251 | .xmit = rds_iw_xmit, | |
fcd8b7c0 AG |
252 | .xmit_rdma = rds_iw_xmit_rdma, |
253 | .recv = rds_iw_recv, | |
254 | .conn_alloc = rds_iw_conn_alloc, | |
255 | .conn_free = rds_iw_conn_free, | |
256 | .conn_connect = rds_iw_conn_connect, | |
257 | .conn_shutdown = rds_iw_conn_shutdown, | |
258 | .inc_copy_to_user = rds_iw_inc_copy_to_user, | |
fcd8b7c0 AG |
259 | .inc_free = rds_iw_inc_free, |
260 | .cm_initiate_connect = rds_iw_cm_initiate_connect, | |
261 | .cm_handle_connect = rds_iw_cm_handle_connect, | |
262 | .cm_connect_complete = rds_iw_cm_connect_complete, | |
263 | .stats_info_copy = rds_iw_stats_info_copy, | |
264 | .exit = rds_iw_exit, | |
265 | .get_mr = rds_iw_get_mr, | |
266 | .sync_mr = rds_iw_sync_mr, | |
267 | .free_mr = rds_iw_free_mr, | |
268 | .flush_mrs = rds_iw_flush_mrs, | |
269 | .t_owner = THIS_MODULE, | |
270 | .t_name = "iwarp", | |
335776bd | 271 | .t_type = RDS_TRANS_IWARP, |
fcd8b7c0 AG |
272 | .t_prefer_loopback = 1, |
273 | }; | |
274 | ||
ef87b7ea | 275 | int rds_iw_init(void) |
fcd8b7c0 AG |
276 | { |
277 | int ret; | |
278 | ||
279 | INIT_LIST_HEAD(&rds_iw_devices); | |
280 | ||
281 | ret = ib_register_client(&rds_iw_client); | |
282 | if (ret) | |
283 | goto out; | |
284 | ||
285 | ret = rds_iw_sysctl_init(); | |
286 | if (ret) | |
287 | goto out_ibreg; | |
288 | ||
289 | ret = rds_iw_recv_init(); | |
290 | if (ret) | |
291 | goto out_sysctl; | |
292 | ||
293 | ret = rds_trans_register(&rds_iw_transport); | |
294 | if (ret) | |
295 | goto out_recv; | |
296 | ||
297 | rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); | |
298 | ||
299 | goto out; | |
300 | ||
301 | out_recv: | |
302 | rds_iw_recv_exit(); | |
303 | out_sysctl: | |
304 | rds_iw_sysctl_exit(); | |
305 | out_ibreg: | |
306 | ib_unregister_client(&rds_iw_client); | |
307 | out: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | MODULE_LICENSE("GPL"); | |
312 |