1 /*
2  * Copyright (c) 2013, Cisco Systems, Inc. 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  * 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 
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/errno.h>
37 
38 #include <rdma/ib_user_verbs.h>
39 #include <rdma/ib_addr.h>
40 
41 #include "usnic_common_util.h"
42 #include "usnic_ib.h"
43 #include "usnic_ib_qp_grp.h"
44 #include "usnic_vnic.h"
45 #include "usnic_ib_verbs.h"
46 #include "usnic_ib_sysfs.h"
47 #include "usnic_log.h"
48 
49 static ssize_t board_id_show(struct device *device,
50 			     struct device_attribute *attr, char *buf)
51 {
52 	struct usnic_ib_dev *us_ibdev =
53 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
54 	unsigned short subsystem_device_id;
55 
56 	mutex_lock(&us_ibdev->usdev_lock);
57 	subsystem_device_id = us_ibdev->pdev->subsystem_device;
58 	mutex_unlock(&us_ibdev->usdev_lock);
59 
60 	return sysfs_emit(buf, "%u\n", subsystem_device_id);
61 }
62 static DEVICE_ATTR_RO(board_id);
63 
64 /*
65  * Report the configuration for this PF
66  */
67 static ssize_t
68 config_show(struct device *device, struct device_attribute *attr, char *buf)
69 {
70 	struct usnic_ib_dev *us_ibdev =
71 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
72 	enum usnic_vnic_res_type res_type;
73 	int len;
74 
75 	mutex_lock(&us_ibdev->usdev_lock);
76 	if (kref_read(&us_ibdev->vf_cnt) > 0) {
77 		char *busname;
78 		char *sep = "";
79 		/*
80 		 * bus name seems to come with annoying prefix.
81 		 * Remove it if it is predictable
82 		 */
83 		busname = us_ibdev->pdev->bus->name;
84 		if (strncmp(busname, "PCI Bus ", 8) == 0)
85 			busname += 8;
86 
87 		len = sysfs_emit(buf, "%s: %s:%d.%d, %s, %pM, %u VFs\n",
88 				 dev_name(&us_ibdev->ib_dev.dev),
89 				 busname,
90 				 PCI_SLOT(us_ibdev->pdev->devfn),
91 				 PCI_FUNC(us_ibdev->pdev->devfn),
92 				 netdev_name(us_ibdev->netdev),
93 				 us_ibdev->ufdev->mac,
94 				 kref_read(&us_ibdev->vf_cnt));
95 
96 		len += sysfs_emit_at(buf, len, " Per VF:");
97 		for (res_type = USNIC_VNIC_RES_TYPE_EOL;
98 		     res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++) {
99 			if (us_ibdev->vf_res_cnt[res_type] == 0)
100 				continue;
101 			len += sysfs_emit_at(buf, len, "%s %d %s",
102 					     sep,
103 					     us_ibdev->vf_res_cnt[res_type],
104 					     usnic_vnic_res_type_to_str(res_type));
105 			sep = ",";
106 		}
107 		len += sysfs_emit_at(buf, len, "\n");
108 	} else {
109 		len = sysfs_emit(buf, "%s: no VFs\n",
110 				 dev_name(&us_ibdev->ib_dev.dev));
111 	}
112 
113 	mutex_unlock(&us_ibdev->usdev_lock);
114 
115 	return len;
116 }
117 static DEVICE_ATTR_RO(config);
118 
119 static ssize_t
120 iface_show(struct device *device, struct device_attribute *attr, char *buf)
121 {
122 	struct usnic_ib_dev *us_ibdev =
123 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
124 
125 	return sysfs_emit(buf, "%s\n", netdev_name(us_ibdev->netdev));
126 }
127 static DEVICE_ATTR_RO(iface);
128 
129 static ssize_t
130 max_vf_show(struct device *device, struct device_attribute *attr, char *buf)
131 {
132 	struct usnic_ib_dev *us_ibdev =
133 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
134 
135 	return sysfs_emit(buf, "%u\n", kref_read(&us_ibdev->vf_cnt));
136 }
137 static DEVICE_ATTR_RO(max_vf);
138 
139 static ssize_t
140 qp_per_vf_show(struct device *device, struct device_attribute *attr, char *buf)
141 {
142 	struct usnic_ib_dev *us_ibdev =
143 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
144 	int qp_per_vf;
145 
146 	qp_per_vf = max(us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_WQ],
147 			us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_RQ]);
148 
149 	return sysfs_emit(buf, "%d\n", qp_per_vf);
150 }
151 static DEVICE_ATTR_RO(qp_per_vf);
152 
153 static ssize_t
154 cq_per_vf_show(struct device *device, struct device_attribute *attr, char *buf)
155 {
156 	struct usnic_ib_dev *us_ibdev =
157 		rdma_device_to_drv_device(device, struct usnic_ib_dev, ib_dev);
158 
159 	return sysfs_emit(buf, "%d\n",
160 			  us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_CQ]);
161 }
162 static DEVICE_ATTR_RO(cq_per_vf);
163 
164 static struct attribute *usnic_class_attributes[] = {
165 	&dev_attr_board_id.attr,
166 	&dev_attr_config.attr,
167 	&dev_attr_iface.attr,
168 	&dev_attr_max_vf.attr,
169 	&dev_attr_qp_per_vf.attr,
170 	&dev_attr_cq_per_vf.attr,
171 	NULL
172 };
173 
174 const struct attribute_group usnic_attr_group = {
175 	.attrs = usnic_class_attributes,
176 };
177 
178 struct qpn_attribute {
179 	struct attribute attr;
180 	ssize_t (*show)(struct usnic_ib_qp_grp *, char *buf);
181 };
182 
183 /*
184  * Definitions for supporting QPN entries in sysfs
185  */
186 static ssize_t
187 usnic_ib_qpn_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
188 {
189 	struct usnic_ib_qp_grp *qp_grp;
190 	struct qpn_attribute *qpn_attr;
191 
192 	qp_grp = container_of(kobj, struct usnic_ib_qp_grp, kobj);
193 	qpn_attr = container_of(attr, struct qpn_attribute, attr);
194 
195 	return qpn_attr->show(qp_grp, buf);
196 }
197 
198 static const struct sysfs_ops usnic_ib_qpn_sysfs_ops = {
199 	.show = usnic_ib_qpn_attr_show
200 };
201 
202 #define QPN_ATTR_RO(NAME) \
203 struct qpn_attribute qpn_attr_##NAME = __ATTR_RO(NAME)
204 
205 static ssize_t context_show(struct usnic_ib_qp_grp *qp_grp, char *buf)
206 {
207 	return sysfs_emit(buf, "0x%p\n", qp_grp->ctx);
208 }
209 
210 static ssize_t summary_show(struct usnic_ib_qp_grp *qp_grp, char *buf)
211 {
212 	int i, j;
213 	struct usnic_vnic_res_chunk *res_chunk;
214 	struct usnic_vnic_res *vnic_res;
215 	int len;
216 
217 	len = sysfs_emit(buf, "QPN: %d State: (%s) PID: %u VF Idx: %hu",
218 			 qp_grp->ibqp.qp_num,
219 			 usnic_ib_qp_grp_state_to_string(qp_grp->state),
220 			 qp_grp->owner_pid,
221 			 usnic_vnic_get_index(qp_grp->vf->vnic));
222 
223 	for (i = 0; qp_grp->res_chunk_list[i]; i++) {
224 		res_chunk = qp_grp->res_chunk_list[i];
225 		for (j = 0; j < res_chunk->cnt; j++) {
226 			vnic_res = res_chunk->res[j];
227 			len += sysfs_emit_at(buf, len, " %s[%d]",
228 				usnic_vnic_res_type_to_str(vnic_res->type),
229 				vnic_res->vnic_idx);
230 		}
231 	}
232 
233 	len += sysfs_emit_at(buf, len, "\n");
234 
235 	return len;
236 }
237 
238 static QPN_ATTR_RO(context);
239 static QPN_ATTR_RO(summary);
240 
241 static struct attribute *usnic_ib_qpn_default_attrs[] = {
242 	&qpn_attr_context.attr,
243 	&qpn_attr_summary.attr,
244 	NULL
245 };
246 ATTRIBUTE_GROUPS(usnic_ib_qpn_default);
247 
248 static struct kobj_type usnic_ib_qpn_type = {
249 	.sysfs_ops = &usnic_ib_qpn_sysfs_ops,
250 	.default_groups = usnic_ib_qpn_default_groups,
251 };
252 
253 int usnic_ib_sysfs_register_usdev(struct usnic_ib_dev *us_ibdev)
254 {
255 	/* create kernel object for looking at individual QPs */
256 	kobject_get(&us_ibdev->ib_dev.dev.kobj);
257 	us_ibdev->qpn_kobj = kobject_create_and_add("qpn",
258 			&us_ibdev->ib_dev.dev.kobj);
259 	if (us_ibdev->qpn_kobj == NULL) {
260 		kobject_put(&us_ibdev->ib_dev.dev.kobj);
261 		return -ENOMEM;
262 	}
263 
264 	return 0;
265 }
266 
267 void usnic_ib_sysfs_unregister_usdev(struct usnic_ib_dev *us_ibdev)
268 {
269 	kobject_put(us_ibdev->qpn_kobj);
270 }
271 
272 void usnic_ib_sysfs_qpn_add(struct usnic_ib_qp_grp *qp_grp)
273 {
274 	struct usnic_ib_dev *us_ibdev;
275 	int err;
276 
277 	us_ibdev = qp_grp->vf->pf;
278 
279 	err = kobject_init_and_add(&qp_grp->kobj, &usnic_ib_qpn_type,
280 			kobject_get(us_ibdev->qpn_kobj),
281 			"%d", qp_grp->grp_id);
282 	if (err) {
283 		kobject_put(us_ibdev->qpn_kobj);
284 		return;
285 	}
286 }
287 
288 void usnic_ib_sysfs_qpn_remove(struct usnic_ib_qp_grp *qp_grp)
289 {
290 	struct usnic_ib_dev *us_ibdev;
291 
292 	us_ibdev = qp_grp->vf->pf;
293 
294 	kobject_put(&qp_grp->kobj);
295 	kobject_put(us_ibdev->qpn_kobj);
296 }
297