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