8c451983d8a5ad548fbe6f65ed95c2a735bac099
[cascardo/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_verbs.c
1 /*
2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33
34 #include <linux/slab.h>
35
36 #include "ipoib.h"
37
38 int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid, int set_qkey)
39 {
40         struct ipoib_dev_priv *priv = netdev_priv(dev);
41         struct ib_qp_attr *qp_attr = NULL;
42         int ret;
43         u16 pkey_index;
44
45         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
46                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
47                 ret = -ENXIO;
48                 goto out;
49         }
50         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
51
52         if (set_qkey) {
53                 ret = -ENOMEM;
54                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
55                 if (!qp_attr)
56                         goto out;
57
58                 /* set correct QKey for QP */
59                 qp_attr->qkey = priv->qkey;
60                 ret = ib_modify_qp(priv->qp, qp_attr, IB_QP_QKEY);
61                 if (ret) {
62                         ipoib_warn(priv, "failed to modify QP, ret = %d\n", ret);
63                         goto out;
64                 }
65         }
66
67         /* attach QP to multicast group */
68         ret = ib_attach_mcast(priv->qp, mgid, mlid);
69         if (ret)
70                 ipoib_warn(priv, "failed to attach to multicast group, ret = %d\n", ret);
71
72 out:
73         kfree(qp_attr);
74         return ret;
75 }
76
77 int ipoib_init_qp(struct net_device *dev)
78 {
79         struct ipoib_dev_priv *priv = netdev_priv(dev);
80         int ret;
81         struct ib_qp_attr qp_attr;
82         int attr_mask;
83
84         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
85                 return -1;
86
87         qp_attr.qp_state = IB_QPS_INIT;
88         qp_attr.qkey = 0;
89         qp_attr.port_num = priv->port;
90         qp_attr.pkey_index = priv->pkey_index;
91         attr_mask =
92             IB_QP_QKEY |
93             IB_QP_PORT |
94             IB_QP_PKEY_INDEX |
95             IB_QP_STATE;
96         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
97         if (ret) {
98                 ipoib_warn(priv, "failed to modify QP to init, ret = %d\n", ret);
99                 goto out_fail;
100         }
101
102         qp_attr.qp_state = IB_QPS_RTR;
103         /* Can't set this in a INIT->RTR transition */
104         attr_mask &= ~IB_QP_PORT;
105         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
106         if (ret) {
107                 ipoib_warn(priv, "failed to modify QP to RTR, ret = %d\n", ret);
108                 goto out_fail;
109         }
110
111         qp_attr.qp_state = IB_QPS_RTS;
112         qp_attr.sq_psn = 0;
113         attr_mask |= IB_QP_SQ_PSN;
114         attr_mask &= ~IB_QP_PKEY_INDEX;
115         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
116         if (ret) {
117                 ipoib_warn(priv, "failed to modify QP to RTS, ret = %d\n", ret);
118                 goto out_fail;
119         }
120
121         return 0;
122
123 out_fail:
124         qp_attr.qp_state = IB_QPS_RESET;
125         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
126                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
127
128         return ret;
129 }
130
131 int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
132 {
133         struct ipoib_dev_priv *priv = netdev_priv(dev);
134         struct ib_qp_init_attr init_attr = {
135                 .cap = {
136                         .max_send_wr  = ipoib_sendq_size,
137                         .max_recv_wr  = ipoib_recvq_size,
138                         .max_send_sge = 1,
139                         .max_recv_sge = IPOIB_UD_RX_SG
140                 },
141                 .sq_sig_type = IB_SIGNAL_ALL_WR,
142                 .qp_type     = IB_QPT_UD
143         };
144         struct ib_cq_init_attr cq_attr = {};
145
146         int ret, size;
147         int i;
148
149         priv->pd = ib_alloc_pd(priv->ca);
150         if (IS_ERR(priv->pd)) {
151                 printk(KERN_WARNING "%s: failed to allocate PD\n", ca->name);
152                 return -ENODEV;
153         }
154
155         /*
156          * the various IPoIB tasks assume they will never race against
157          * themselves, so always use a single thread workqueue
158          */
159         priv->wq = create_singlethread_workqueue("ipoib_wq");
160         if (!priv->wq) {
161                 printk(KERN_WARNING "ipoib: failed to allocate device WQ\n");
162                 goto out_free_pd;
163         }
164
165         size = ipoib_recvq_size + 1;
166         ret = ipoib_cm_dev_init(dev);
167         if (!ret) {
168                 size += ipoib_sendq_size;
169                 if (ipoib_cm_has_srq(dev))
170                         size += ipoib_recvq_size + 1; /* 1 extra for rx_drain_qp */
171                 else
172                         size += ipoib_recvq_size * ipoib_max_conn_qp;
173         } else
174                 if (ret != -ENOSYS)
175                         goto out_free_wq;
176
177         cq_attr.cqe = size;
178         priv->recv_cq = ib_create_cq(priv->ca, ipoib_ib_completion, NULL,
179                                      dev, &cq_attr);
180         if (IS_ERR(priv->recv_cq)) {
181                 printk(KERN_WARNING "%s: failed to create receive CQ\n", ca->name);
182                 goto out_cm_dev_cleanup;
183         }
184
185         cq_attr.cqe = ipoib_sendq_size;
186         priv->send_cq = ib_create_cq(priv->ca, ipoib_send_comp_handler, NULL,
187                                      dev, &cq_attr);
188         if (IS_ERR(priv->send_cq)) {
189                 printk(KERN_WARNING "%s: failed to create send CQ\n", ca->name);
190                 goto out_free_recv_cq;
191         }
192
193         if (ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP))
194                 goto out_free_send_cq;
195
196         init_attr.send_cq = priv->send_cq;
197         init_attr.recv_cq = priv->recv_cq;
198
199         if (priv->hca_caps & IB_DEVICE_UD_TSO)
200                 init_attr.create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
201
202         if (priv->hca_caps & IB_DEVICE_BLOCK_MULTICAST_LOOPBACK)
203                 init_attr.create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
204
205         if (priv->hca_caps & IB_DEVICE_MANAGED_FLOW_STEERING)
206                 init_attr.create_flags |= IB_QP_CREATE_NETIF_QP;
207
208         if (dev->features & NETIF_F_SG)
209                 init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;
210
211         priv->qp = ib_create_qp(priv->pd, &init_attr);
212         if (IS_ERR(priv->qp)) {
213                 printk(KERN_WARNING "%s: failed to create QP\n", ca->name);
214                 goto out_free_send_cq;
215         }
216
217         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
218         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
219         priv->dev->dev_addr[3] = (priv->qp->qp_num      ) & 0xff;
220
221         for (i = 0; i < MAX_SKB_FRAGS + 1; ++i)
222                 priv->tx_sge[i].lkey = priv->pd->local_dma_lkey;
223
224         priv->tx_wr.opcode      = IB_WR_SEND;
225         priv->tx_wr.sg_list     = priv->tx_sge;
226         priv->tx_wr.send_flags  = IB_SEND_SIGNALED;
227
228         priv->rx_sge[0].lkey = priv->pd->local_dma_lkey;
229
230         priv->rx_sge[0].length = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
231         priv->rx_wr.num_sge = 1;
232
233         priv->rx_wr.next = NULL;
234         priv->rx_wr.sg_list = priv->rx_sge;
235
236         return 0;
237
238 out_free_send_cq:
239         ib_destroy_cq(priv->send_cq);
240
241 out_free_recv_cq:
242         ib_destroy_cq(priv->recv_cq);
243
244 out_cm_dev_cleanup:
245         ipoib_cm_dev_cleanup(dev);
246
247 out_free_wq:
248         destroy_workqueue(priv->wq);
249         priv->wq = NULL;
250
251 out_free_pd:
252         ib_dealloc_pd(priv->pd);
253
254         return -ENODEV;
255 }
256
257 void ipoib_transport_dev_cleanup(struct net_device *dev)
258 {
259         struct ipoib_dev_priv *priv = netdev_priv(dev);
260
261         if (priv->qp) {
262                 if (ib_destroy_qp(priv->qp))
263                         ipoib_warn(priv, "ib_qp_destroy failed\n");
264
265                 priv->qp = NULL;
266                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
267         }
268
269         if (ib_destroy_cq(priv->send_cq))
270                 ipoib_warn(priv, "ib_cq_destroy (send) failed\n");
271
272         if (ib_destroy_cq(priv->recv_cq))
273                 ipoib_warn(priv, "ib_cq_destroy (recv) failed\n");
274
275         ipoib_cm_dev_cleanup(dev);
276
277         if (priv->wq) {
278                 flush_workqueue(priv->wq);
279                 destroy_workqueue(priv->wq);
280                 priv->wq = NULL;
281         }
282
283         if (ib_dealloc_pd(priv->pd))
284                 ipoib_warn(priv, "ib_dealloc_pd failed\n");
285
286 }
287
288 void ipoib_event(struct ib_event_handler *handler,
289                  struct ib_event *record)
290 {
291         struct ipoib_dev_priv *priv =
292                 container_of(handler, struct ipoib_dev_priv, event_handler);
293
294         if (record->element.port_num != priv->port)
295                 return;
296
297         ipoib_dbg(priv, "Event %d on device %s port %d\n", record->event,
298                   record->device->name, record->element.port_num);
299
300         if (record->event == IB_EVENT_SM_CHANGE ||
301             record->event == IB_EVENT_CLIENT_REREGISTER) {
302                 queue_work(ipoib_workqueue, &priv->flush_light);
303         } else if (record->event == IB_EVENT_PORT_ERR ||
304                    record->event == IB_EVENT_PORT_ACTIVE ||
305                    record->event == IB_EVENT_LID_CHANGE) {
306                 queue_work(ipoib_workqueue, &priv->flush_normal);
307         } else if (record->event == IB_EVENT_PKEY_CHANGE) {
308                 queue_work(ipoib_workqueue, &priv->flush_heavy);
309         }
310 }