drivers/net/ethernet/intel/fm10k/fm10k_debugfs.c

   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
  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
  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
  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
  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
  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
  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
 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  **/
 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         if (!q_vector->dbg_q_vector)
 164                 return;
 165
 166         /* Generate a file for each rx ring in the q_vector */
 167         for (i = 0; i < q_vector->tx.count; i++) {
 168                 struct fm10k_ring *ring = &q_vector->tx.ring[i];
 169
 170                 snprintf(name, sizeof(name), "tx_ring.%03d", ring->queue_index);
 171
 172                 debugfs_create_file(name, 0600,
 173                                     q_vector->dbg_q_vector, ring,
 174                                     &fm10k_dbg_desc_fops);
 175         }
 176
 177         /* Generate a file for each rx ring in the q_vector */
 178         for (i = 0; i < q_vector->rx.count; i++) {
 179                 struct fm10k_ring *ring = &q_vector->rx.ring[i];
 180
 181                 snprintf(name, sizeof(name), "rx_ring.%03d", ring->queue_index);
 182
 183                 debugfs_create_file(name, 0600,
 184                                     q_vector->dbg_q_vector, ring,
 185                                     &fm10k_dbg_desc_fops);
 186         }
 187 }
 188
 189 /**
 190  * fm10k_dbg_free_q_vector_dir - setup debugfs for the q_vectors
 191  * @q_vector: q_vector to allocate directories for
 192  **/
 193 void fm10k_dbg_q_vector_exit(struct fm10k_q_vector *q_vector)
 194 {
 195         struct fm10k_intfc *interface = q_vector->interface;
 196
 197         if (interface->dbg_intfc)
 198                 debugfs_remove_recursive(q_vector->dbg_q_vector);
 199         q_vector->dbg_q_vector = NULL;
 200 }
 201
 202 /**
 203  * fm10k_dbg_intfc_init - setup the debugfs directory for the intferface
 204  * @interface: the interface that is starting up
 205  **/
 206
 207 void fm10k_dbg_intfc_init(struct fm10k_intfc *interface)
 208 {
 209         const char *name = pci_name(interface->pdev);
 210
 211         if (dbg_root)
 212                 interface->dbg_intfc = debugfs_create_dir(name, dbg_root);
 213 }
 214
 215 /**
 216  * fm10k_dbg_intfc_exit - clean out the interface's debugfs entries
 217  * @interface: the interface that is stopping
 218  **/
 219 void fm10k_dbg_intfc_exit(struct fm10k_intfc *interface)
 220 {
 221         if (dbg_root)
 222                 debugfs_remove_recursive(interface->dbg_intfc);
 223         interface->dbg_intfc = NULL;
 224 }
 225
 226 /**
 227  * fm10k_dbg_init - start up debugfs for the driver
 228  **/
 229 void fm10k_dbg_init(void)
 230 {
 231         dbg_root = debugfs_create_dir(fm10k_driver_name, NULL);
 232 }
 233
 234 /**
 235  * fm10k_dbg_exit - clean out the driver's debugfs entries
 236  **/
 237 void fm10k_dbg_exit(void)
 238 {
 239         debugfs_remove_recursive(dbg_root);
 240         dbg_root = NULL;
 241 }