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/debugfs.h>
35 
36 #include "usnic.h"
37 #include "usnic_log.h"
38 #include "usnic_debugfs.h"
39 #include "usnic_ib_qp_grp.h"
40 #include "usnic_transport.h"
41 
42 static struct dentry *debugfs_root;
43 static struct dentry *flows_dentry;
44 
45 static ssize_t usnic_debugfs_buildinfo_read(struct file *f, char __user *data,
46 						size_t count, loff_t *ppos)
47 {
48 	char buf[500];
49 	int res;
50 
51 	if (*ppos > 0)
52 		return 0;
53 
54 	res = scnprintf(buf, sizeof(buf),
55 			"version:       %s\n"
56 			"build date:    %s\n",
57 			DRV_VERSION, DRV_RELDATE);
58 
59 	return simple_read_from_buffer(data, count, ppos, buf, res);
60 }
61 
62 static const struct file_operations usnic_debugfs_buildinfo_ops = {
63 	.owner = THIS_MODULE,
64 	.open = simple_open,
65 	.read = usnic_debugfs_buildinfo_read
66 };
67 
68 static ssize_t flowinfo_read(struct file *f, char __user *data,
69 				size_t count, loff_t *ppos)
70 {
71 	struct usnic_ib_qp_grp_flow *qp_flow;
72 	int n;
73 	int left;
74 	char *ptr;
75 	char buf[512];
76 
77 	qp_flow = f->private_data;
78 	ptr = buf;
79 	left = count;
80 
81 	if (*ppos > 0)
82 		return 0;
83 
84 	spin_lock(&qp_flow->qp_grp->lock);
85 	n = scnprintf(ptr, left,
86 			"QP Grp ID: %d Transport: %s ",
87 			qp_flow->qp_grp->grp_id,
88 			usnic_transport_to_str(qp_flow->trans_type));
89 	UPDATE_PTR_LEFT(n, ptr, left);
90 	if (qp_flow->trans_type == USNIC_TRANSPORT_ROCE_CUSTOM) {
91 		n = scnprintf(ptr, left, "Port_Num:%hu\n",
92 					qp_flow->usnic_roce.port_num);
93 		UPDATE_PTR_LEFT(n, ptr, left);
94 	} else if (qp_flow->trans_type == USNIC_TRANSPORT_IPV4_UDP) {
95 		n = usnic_transport_sock_to_str(ptr, left,
96 				qp_flow->udp.sock);
97 		UPDATE_PTR_LEFT(n, ptr, left);
98 		n = scnprintf(ptr, left, "\n");
99 		UPDATE_PTR_LEFT(n, ptr, left);
100 	}
101 	spin_unlock(&qp_flow->qp_grp->lock);
102 
103 	return simple_read_from_buffer(data, count, ppos, buf, ptr - buf);
104 }
105 
106 static const struct file_operations flowinfo_ops = {
107 	.owner = THIS_MODULE,
108 	.open = simple_open,
109 	.read = flowinfo_read,
110 };
111 
112 void usnic_debugfs_init(void)
113 {
114 	debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
115 
116 	flows_dentry = debugfs_create_dir("flows", debugfs_root);
117 
118 	debugfs_create_file("build-info", S_IRUGO, debugfs_root,
119 				NULL, &usnic_debugfs_buildinfo_ops);
120 }
121 
122 void usnic_debugfs_exit(void)
123 {
124 	debugfs_remove_recursive(debugfs_root);
125 	debugfs_root = NULL;
126 }
127 
128 void usnic_debugfs_flow_add(struct usnic_ib_qp_grp_flow *qp_flow)
129 {
130 	scnprintf(qp_flow->dentry_name, sizeof(qp_flow->dentry_name),
131 			"%u", qp_flow->flow->flow_id);
132 	qp_flow->dbgfs_dentry = debugfs_create_file(qp_flow->dentry_name,
133 							S_IRUGO,
134 							flows_dentry,
135 							qp_flow,
136 							&flowinfo_ops);
137 }
138 
139 void usnic_debugfs_flow_remove(struct usnic_ib_qp_grp_flow *qp_flow)
140 {
141 	debugfs_remove(qp_flow->dbgfs_dentry);
142 }
143