Root/net/rds/iw.c

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
330

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