1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2013 - 2018 Intel Corporation. */
3 
4 #include "fm10k.h"
5 
6 #include <linux/debugfs.h>
7 #include <linux/seq_file.h>
8 
9 static struct dentry *dbg_root;
10 
11 /* Descriptor Seq Functions */
12 
fm10k_dbg_desc_seq_start(struct seq_file * s,loff_t * pos)13 static void *fm10k_dbg_desc_seq_start(struct seq_file *s, loff_t *pos)
14 {
15 	struct fm10k_ring *ring = s->private;
16 
17 	return (*pos < ring->count) ? pos : NULL;
18 }
19 
fm10k_dbg_desc_seq_next(struct seq_file * s,void __always_unused * v,loff_t * pos)20 static void *fm10k_dbg_desc_seq_next(struct seq_file *s,
21 				     void __always_unused *v,
22 				     loff_t *pos)
23 {
24 	struct fm10k_ring *ring = s->private;
25 
26 	return (++(*pos) < ring->count) ? pos : NULL;
27 }
28 
fm10k_dbg_desc_seq_stop(struct seq_file __always_unused * s,void __always_unused * v)29 static void fm10k_dbg_desc_seq_stop(struct seq_file __always_unused *s,
30 				    void __always_unused *v)
31 {
32 	/* Do nothing. */
33 }
34 
fm10k_dbg_desc_break(struct seq_file * s,int i)35 static void fm10k_dbg_desc_break(struct seq_file *s, int i)
36 {
37 	while (i--)
38 		seq_putc(s, '-');
39 
40 	seq_putc(s, '\n');
41 }
42 
fm10k_dbg_tx_desc_seq_show(struct seq_file * s,void * v)43 static int fm10k_dbg_tx_desc_seq_show(struct seq_file *s, void *v)
44 {
45 	struct fm10k_ring *ring = s->private;
46 	int i = *(loff_t *)v;
47 	static const char tx_desc_hdr[] =
48 		"DES BUFFER_ADDRESS     LENGTH VLAN   MSS    HDRLEN FLAGS\n";
49 
50 	/* Generate header */
51 	if (!i) {
52 		seq_printf(s, tx_desc_hdr);
53 		fm10k_dbg_desc_break(s, sizeof(tx_desc_hdr) - 1);
54 	}
55 
56 	/* Validate descriptor allocation */
57 	if (!ring->desc) {
58 		seq_printf(s, "%03X Descriptor ring not allocated.\n", i);
59 	} else {
60 		struct fm10k_tx_desc *txd = FM10K_TX_DESC(ring, i);
61 
62 		seq_printf(s, "%03X %#018llx %#06x %#06x %#06x %#06x %#04x\n",
63 			   i, txd->buffer_addr, txd->buflen, txd->vlan,
64 			   txd->mss, txd->hdrlen, txd->flags);
65 	}
66 
67 	return 0;
68 }
69 
fm10k_dbg_rx_desc_seq_show(struct seq_file * s,void * v)70 static int fm10k_dbg_rx_desc_seq_show(struct seq_file *s, void *v)
71 {
72 	struct fm10k_ring *ring = s->private;
73 	int i = *(loff_t *)v;
74 	static const char rx_desc_hdr[] =
75 	"DES DATA       RSS        STATERR    LENGTH VLAN   DGLORT SGLORT TIMESTAMP\n";
76 
77 	/* Generate header */
78 	if (!i) {
79 		seq_printf(s, rx_desc_hdr);
80 		fm10k_dbg_desc_break(s, sizeof(rx_desc_hdr) - 1);
81 	}
82 
83 	/* Validate descriptor allocation */
84 	if (!ring->desc) {
85 		seq_printf(s, "%03X Descriptor ring not allocated.\n", i);
86 	} else {
87 		union fm10k_rx_desc *rxd = FM10K_RX_DESC(ring, i);
88 
89 		seq_printf(s,
90 			   "%03X %#010x %#010x %#010x %#06x %#06x %#06x %#06x %#018llx\n",
91 			   i, rxd->d.data, rxd->d.rss, rxd->d.staterr,
92 			   rxd->w.length, rxd->w.vlan, rxd->w.dglort,
93 			   rxd->w.sglort, rxd->q.timestamp);
94 	}
95 
96 	return 0;
97 }
98 
99 static const struct seq_operations fm10k_dbg_tx_desc_seq_ops = {
100 	.start = fm10k_dbg_desc_seq_start,
101 	.next  = fm10k_dbg_desc_seq_next,
102 	.stop  = fm10k_dbg_desc_seq_stop,
103 	.show  = fm10k_dbg_tx_desc_seq_show,
104 };
105 
106 static const struct seq_operations fm10k_dbg_rx_desc_seq_ops = {
107 	.start = fm10k_dbg_desc_seq_start,
108 	.next  = fm10k_dbg_desc_seq_next,
109 	.stop  = fm10k_dbg_desc_seq_stop,
110 	.show  = fm10k_dbg_rx_desc_seq_show,
111 };
112 
fm10k_dbg_desc_open(struct inode * inode,struct file * filep)113 static int fm10k_dbg_desc_open(struct inode *inode, struct file *filep)
114 {
115 	struct fm10k_ring *ring = inode->i_private;
116 	struct fm10k_q_vector *q_vector = ring->q_vector;
117 	const struct seq_operations *desc_seq_ops;
118 	int err;
119 
120 	if (ring < q_vector->rx.ring)
121 		desc_seq_ops = &fm10k_dbg_tx_desc_seq_ops;
122 	else
123 		desc_seq_ops = &fm10k_dbg_rx_desc_seq_ops;
124 
125 	err = seq_open(filep, desc_seq_ops);
126 	if (err)
127 		return err;
128 
129 	((struct seq_file *)filep->private_data)->private = ring;
130 
131 	return 0;
132 }
133 
134 static const struct file_operations fm10k_dbg_desc_fops = {
135 	.owner   = THIS_MODULE,
136 	.open    = fm10k_dbg_desc_open,
137 	.read    = seq_read,
138 	.llseek  = seq_lseek,
139 	.release = seq_release,
140 };
141 
142 /**
143  * fm10k_dbg_q_vector_init - setup debugfs for the q_vectors
144  * @q_vector: q_vector to allocate directories for
145  *
146  * A folder is created for each q_vector found. In each q_vector
147  * folder, a debugfs file is created for each tx and rx ring
148  * allocated to the q_vector.
149  **/
fm10k_dbg_q_vector_init(struct fm10k_q_vector * q_vector)150 void fm10k_dbg_q_vector_init(struct fm10k_q_vector *q_vector)
151 {
152 	struct fm10k_intfc *interface = q_vector->interface;
153 	char name[16];
154 	int i;
155 
156 	if (!interface->dbg_intfc)
157 		return;
158 
159 	/* Generate a folder for each q_vector */
160 	snprintf(name, sizeof(name), "q_vector.%03d", q_vector->v_idx);
161 
162 	q_vector->dbg_q_vector = debugfs_create_dir(name, interface->dbg_intfc);
163 
164 	/* Generate a file for each rx ring in the q_vector */
165 	for (i = 0; i < q_vector->tx.count; i++) {
166 		struct fm10k_ring *ring = &q_vector->tx.ring[i];
167 
168 		snprintf(name, sizeof(name), "tx_ring.%03d", ring->queue_index);
169 
170 		debugfs_create_file(name, 0600,
171 				    q_vector->dbg_q_vector, ring,
172 				    &fm10k_dbg_desc_fops);
173 	}
174 
175 	/* Generate a file for each rx ring in the q_vector */
176 	for (i = 0; i < q_vector->rx.count; i++) {
177 		struct fm10k_ring *ring = &q_vector->rx.ring[i];
178 
179 		snprintf(name, sizeof(name), "rx_ring.%03d", ring->queue_index);
180 
181 		debugfs_create_file(name, 0600,
182 				    q_vector->dbg_q_vector, ring,
183 				    &fm10k_dbg_desc_fops);
184 	}
185 }
186 
187 /**
188  * fm10k_dbg_q_vector_exit - setup debugfs for the q_vectors
189  * @q_vector: q_vector to allocate directories for
190  **/
fm10k_dbg_q_vector_exit(struct fm10k_q_vector * q_vector)191 void fm10k_dbg_q_vector_exit(struct fm10k_q_vector *q_vector)
192 {
193 	struct fm10k_intfc *interface = q_vector->interface;
194 
195 	if (interface->dbg_intfc)
196 		debugfs_remove_recursive(q_vector->dbg_q_vector);
197 	q_vector->dbg_q_vector = NULL;
198 }
199 
200 /**
201  * fm10k_dbg_intfc_init - setup the debugfs directory for the intferface
202  * @interface: the interface that is starting up
203  **/
204 
fm10k_dbg_intfc_init(struct fm10k_intfc * interface)205 void fm10k_dbg_intfc_init(struct fm10k_intfc *interface)
206 {
207 	const char *name = pci_name(interface->pdev);
208 
209 	if (dbg_root)
210 		interface->dbg_intfc = debugfs_create_dir(name, dbg_root);
211 }
212 
213 /**
214  * fm10k_dbg_intfc_exit - clean out the interface's debugfs entries
215  * @interface: the interface that is stopping
216  **/
fm10k_dbg_intfc_exit(struct fm10k_intfc * interface)217 void fm10k_dbg_intfc_exit(struct fm10k_intfc *interface)
218 {
219 	if (dbg_root)
220 		debugfs_remove_recursive(interface->dbg_intfc);
221 	interface->dbg_intfc = NULL;
222 }
223 
224 /**
225  * fm10k_dbg_init - start up debugfs for the driver
226  **/
fm10k_dbg_init(void)227 void fm10k_dbg_init(void)
228 {
229 	dbg_root = debugfs_create_dir(fm10k_driver_name, NULL);
230 }
231 
232 /**
233  * fm10k_dbg_exit - clean out the driver's debugfs entries
234  **/
fm10k_dbg_exit(void)235 void fm10k_dbg_exit(void)
236 {
237 	debugfs_remove_recursive(dbg_root);
238 	dbg_root = NULL;
239 }
240