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
45unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
46unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
47
48module_param(fastreg_pool_size, int, 0444);
49MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
50module_param(fastreg_message_size, int, 0444);
51MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
52
53struct list_head rds_iw_devices;
54
55/* NOTE: if also grabbing iwdev lock, grab this first */
56DEFINE_SPINLOCK(iw_nodev_conns_lock);
57LIST_HEAD(iw_nodev_conns);
58
59void 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
116err_mr:
117	if (rds_iwdev->mr)
118		ib_dereg_mr(rds_iwdev->mr);
119err_pd:
120	ib_dealloc_pd(rds_iwdev->pd);
121free_dev:
122	kfree(rds_iwdev);
123free_attr:
124	kfree(dev_attr);
125}
126
127void 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
160struct ib_client rds_iw_client = {
161	.name   = "rds_iw",
162	.add    = rds_iw_add_one,
163	.remove = rds_iw_remove_one
164};
165
166static 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
200static 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 */
220static 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
253void 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
263struct 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_cong_map		= NULL,
268	.xmit_rdma		= rds_iw_xmit_rdma,
269	.recv			= rds_iw_recv,
270	.conn_alloc		= rds_iw_conn_alloc,
271	.conn_free		= rds_iw_conn_free,
272	.conn_connect		= rds_iw_conn_connect,
273	.conn_shutdown		= rds_iw_conn_shutdown,
274	.inc_copy_to_user	= rds_iw_inc_copy_to_user,
275	.inc_purge		= rds_iw_inc_purge,
276	.inc_free		= rds_iw_inc_free,
277	.cm_initiate_connect	= rds_iw_cm_initiate_connect,
278	.cm_handle_connect	= rds_iw_cm_handle_connect,
279	.cm_connect_complete	= rds_iw_cm_connect_complete,
280	.stats_info_copy	= rds_iw_stats_info_copy,
281	.exit			= rds_iw_exit,
282	.get_mr			= rds_iw_get_mr,
283	.sync_mr		= rds_iw_sync_mr,
284	.free_mr		= rds_iw_free_mr,
285	.flush_mrs		= rds_iw_flush_mrs,
286	.t_owner		= THIS_MODULE,
287	.t_name			= "iwarp",
288	.t_type			= RDS_TRANS_IWARP,
289	.t_prefer_loopback	= 1,
290};
291
292int __init rds_iw_init(void)
293{
294	int ret;
295
296	INIT_LIST_HEAD(&rds_iw_devices);
297
298	ret = ib_register_client(&rds_iw_client);
299	if (ret)
300		goto out;
301
302	ret = rds_iw_sysctl_init();
303	if (ret)
304		goto out_ibreg;
305
306	ret = rds_iw_recv_init();
307	if (ret)
308		goto out_sysctl;
309
310	ret = rds_trans_register(&rds_iw_transport);
311	if (ret)
312		goto out_recv;
313
314	rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
315
316	goto out;
317
318out_recv:
319	rds_iw_recv_exit();
320out_sysctl:
321	rds_iw_sysctl_exit();
322out_ibreg:
323	ib_unregister_client(&rds_iw_client);
324out:
325	return ret;
326}
327
328MODULE_LICENSE("GPL");
329