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, struct ib_device *hca,
39 		       union ib_gid *mgid, u16 mlid, int set_qkey, u32 qkey)
40 {
41 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
42 	struct ib_qp_attr *qp_attr = NULL;
43 	int ret;
44 	u16 pkey_index;
45 
46 	if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
47 		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
48 		ret = -ENXIO;
49 		goto out;
50 	}
51 	set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
52 
53 	if (set_qkey) {
54 		ret = -ENOMEM;
55 		qp_attr = kmalloc(sizeof(*qp_attr), GFP_KERNEL);
56 		if (!qp_attr)
57 			goto out;
58 
59 		/* set correct QKey for QP */
60 		qp_attr->qkey = qkey;
61 		ret = ib_modify_qp(priv->qp, qp_attr, IB_QP_QKEY);
62 		if (ret) {
63 			ipoib_warn(priv, "failed to modify QP, ret = %d\n", ret);
64 			goto out;
65 		}
66 	}
67 
68 	/* attach QP to multicast group */
69 	ret = ib_attach_mcast(priv->qp, mgid, mlid);
70 	if (ret)
71 		ipoib_warn(priv, "failed to attach to multicast group, ret = %d\n", ret);
72 
73 out:
74 	kfree(qp_attr);
75 	return ret;
76 }
77 
78 int ipoib_mcast_detach(struct net_device *dev, struct ib_device *hca,
79 		       union ib_gid *mgid, u16 mlid)
80 {
81 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
82 	int ret;
83 
84 	ret = ib_detach_mcast(priv->qp, mgid, mlid);
85 
86 	return ret;
87 }
88 
89 int ipoib_init_qp(struct net_device *dev)
90 {
91 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
92 	int ret;
93 	struct ib_qp_attr qp_attr;
94 	int attr_mask;
95 
96 	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
97 		return -1;
98 
99 	qp_attr.qp_state = IB_QPS_INIT;
100 	qp_attr.qkey = 0;
101 	qp_attr.port_num = priv->port;
102 	qp_attr.pkey_index = priv->pkey_index;
103 	attr_mask =
104 	    IB_QP_QKEY |
105 	    IB_QP_PORT |
106 	    IB_QP_PKEY_INDEX |
107 	    IB_QP_STATE;
108 	ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
109 	if (ret) {
110 		ipoib_warn(priv, "failed to modify QP to init, ret = %d\n", ret);
111 		goto out_fail;
112 	}
113 
114 	qp_attr.qp_state = IB_QPS_RTR;
115 	/* Can't set this in a INIT->RTR transition */
116 	attr_mask &= ~IB_QP_PORT;
117 	ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
118 	if (ret) {
119 		ipoib_warn(priv, "failed to modify QP to RTR, ret = %d\n", ret);
120 		goto out_fail;
121 	}
122 
123 	qp_attr.qp_state = IB_QPS_RTS;
124 	qp_attr.sq_psn = 0;
125 	attr_mask |= IB_QP_SQ_PSN;
126 	attr_mask &= ~IB_QP_PKEY_INDEX;
127 	ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
128 	if (ret) {
129 		ipoib_warn(priv, "failed to modify QP to RTS, ret = %d\n", ret);
130 		goto out_fail;
131 	}
132 
133 	return 0;
134 
135 out_fail:
136 	qp_attr.qp_state = IB_QPS_RESET;
137 	if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
138 		ipoib_warn(priv, "Failed to modify QP to RESET state\n");
139 
140 	return ret;
141 }
142 
143 int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
144 {
145 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
146 	struct ib_qp_init_attr init_attr = {
147 		.cap = {
148 			.max_send_wr  = ipoib_sendq_size,
149 			.max_recv_wr  = ipoib_recvq_size,
150 			.max_send_sge = min_t(u32, priv->ca->attrs.max_send_sge,
151 					      MAX_SKB_FRAGS + 1),
152 			.max_recv_sge = IPOIB_UD_RX_SG
153 		},
154 		.sq_sig_type = IB_SIGNAL_ALL_WR,
155 		.qp_type     = IB_QPT_UD
156 	};
157 	struct ib_cq_init_attr cq_attr = {};
158 
159 	int ret, size, req_vec;
160 	int i;
161 	static atomic_t counter;
162 
163 	size = ipoib_recvq_size + 1;
164 	ret = ipoib_cm_dev_init(dev);
165 	if (!ret) {
166 		size += ipoib_sendq_size;
167 		if (ipoib_cm_has_srq(dev))
168 			size += ipoib_recvq_size + 1; /* 1 extra for rx_drain_qp */
169 		else
170 			size += ipoib_recvq_size * ipoib_max_conn_qp;
171 	} else
172 		if (ret != -EOPNOTSUPP)
173 			return ret;
174 
175 	req_vec = atomic_inc_return(&counter) * 2;
176 	cq_attr.cqe = size;
177 	cq_attr.comp_vector = req_vec % priv->ca->num_comp_vectors;
178 	priv->recv_cq = ib_create_cq(priv->ca, ipoib_ib_rx_completion, NULL,
179 				     priv, &cq_attr);
180 	if (IS_ERR(priv->recv_cq)) {
181 		pr_warn("%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 	cq_attr.comp_vector = (req_vec + 1) % priv->ca->num_comp_vectors;
187 	priv->send_cq = ib_create_cq(priv->ca, ipoib_ib_tx_completion, NULL,
188 				     priv, &cq_attr);
189 	if (IS_ERR(priv->send_cq)) {
190 		pr_warn("%s: failed to create send CQ\n", ca->name);
191 		goto out_free_recv_cq;
192 	}
193 
194 	if (ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP))
195 		goto out_free_send_cq;
196 
197 	init_attr.send_cq = priv->send_cq;
198 	init_attr.recv_cq = priv->recv_cq;
199 
200 	if (priv->kernel_caps & IBK_UD_TSO)
201 		init_attr.create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
202 
203 	if (priv->kernel_caps & IBK_BLOCK_MULTICAST_LOOPBACK)
204 		init_attr.create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
205 
206 	if (priv->hca_caps & IB_DEVICE_MANAGED_FLOW_STEERING)
207 		init_attr.create_flags |= IB_QP_CREATE_NETIF_QP;
208 
209 	if (priv->kernel_caps & IBK_RDMA_NETDEV_OPA)
210 		init_attr.create_flags |= IB_QP_CREATE_NETDEV_USE;
211 
212 	priv->qp = ib_create_qp(priv->pd, &init_attr);
213 	if (IS_ERR(priv->qp)) {
214 		pr_warn("%s: failed to create QP\n", ca->name);
215 		goto out_free_send_cq;
216 	}
217 
218 	if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
219 		goto out_free_send_cq;
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.wr.opcode		= IB_WR_SEND;
225 	priv->tx_wr.wr.sg_list		= priv->tx_sge;
226 	priv->tx_wr.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 	if (init_attr.cap.max_send_sge > 1)
237 		dev->features |= NETIF_F_SG;
238 
239 	priv->max_send_sge = init_attr.cap.max_send_sge;
240 
241 	return 0;
242 
243 out_free_send_cq:
244 	ib_destroy_cq(priv->send_cq);
245 
246 out_free_recv_cq:
247 	ib_destroy_cq(priv->recv_cq);
248 
249 out_cm_dev_cleanup:
250 	ipoib_cm_dev_cleanup(dev);
251 
252 	return -ENODEV;
253 }
254 
255 void ipoib_transport_dev_cleanup(struct net_device *dev)
256 {
257 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
258 
259 	if (priv->qp) {
260 		if (ib_destroy_qp(priv->qp))
261 			ipoib_warn(priv, "ib_qp_destroy failed\n");
262 
263 		priv->qp = NULL;
264 	}
265 
266 	ib_destroy_cq(priv->send_cq);
267 	ib_destroy_cq(priv->recv_cq);
268 }
269 
270 void ipoib_event(struct ib_event_handler *handler,
271 		 struct ib_event *record)
272 {
273 	struct ipoib_dev_priv *priv =
274 		container_of(handler, struct ipoib_dev_priv, event_handler);
275 
276 	if (record->element.port_num != priv->port)
277 		return;
278 
279 	ipoib_dbg(priv, "Event %d on device %s port %d\n", record->event,
280 		  dev_name(&record->device->dev), record->element.port_num);
281 
282 	if (record->event == IB_EVENT_CLIENT_REREGISTER) {
283 		queue_work(ipoib_workqueue, &priv->flush_light);
284 	} else if (record->event == IB_EVENT_PORT_ERR ||
285 		   record->event == IB_EVENT_PORT_ACTIVE ||
286 		   record->event == IB_EVENT_LID_CHANGE) {
287 		queue_work(ipoib_workqueue, &priv->flush_normal);
288 	} else if (record->event == IB_EVENT_PKEY_CHANGE) {
289 		queue_work(ipoib_workqueue, &priv->flush_heavy);
290 	} else if (record->event == IB_EVENT_GID_CHANGE &&
291 		   !test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
292 		queue_work(ipoib_workqueue, &priv->flush_light);
293 	}
294 }
295