drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c

   1 /*
   2  * Copyright (C) 2015-2017 Netronome Systems, Inc.
   3  *
   4  * This software is dual licensed under the GNU General License Version 2,
   5  * June 1991 as shown in the file COPYING in the top-level directory of this
   6  * source tree or the BSD 2-Clause License provided below.  You have the
   7  * option to license this software under the complete terms of either license.
   8  *
   9  * The BSD 2-Clause License:
  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  *      1. Redistributions of source code must retain the above
  16  *         copyright notice, this list of conditions and the following
  17  *         disclaimer.
  18  *
  19  *      2. 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 #include <linux/debugfs.h>
  34 #include <linux/module.h>
  35 #include <linux/rtnetlink.h>
  36
  37 #include "nfp_net.h"
  38
  39 static struct dentry *nfp_dir;
  40
  41 static int nfp_net_debugfs_rx_q_read(struct seq_file *file, void *data)
  42 {
  43         int fl_rd_p, fl_wr_p, rx_rd_p, rx_wr_p, rxd_cnt;
  44         struct nfp_net_r_vector *r_vec = file->private;
  45         struct nfp_net_rx_ring *rx_ring;
  46         struct nfp_net_rx_desc *rxd;
  47         struct nfp_net *nn;
  48         void *frag;
  49         int i;
  50
  51         rtnl_lock();
  52
  53         if (!r_vec->nfp_net || !r_vec->rx_ring)
  54                 goto out;
  55         nn = r_vec->nfp_net;
  56         rx_ring = r_vec->rx_ring;
  57         if (!netif_running(nn->netdev))
  58                 goto out;
  59
  60         rxd_cnt = rx_ring->cnt;
  61
  62         fl_rd_p = nfp_qcp_rd_ptr_read(rx_ring->qcp_fl);
  63         fl_wr_p = nfp_qcp_wr_ptr_read(rx_ring->qcp_fl);
  64         rx_rd_p = nfp_qcp_rd_ptr_read(rx_ring->qcp_rx);
  65         rx_wr_p = nfp_qcp_wr_ptr_read(rx_ring->qcp_rx);
  66
  67         seq_printf(file, "RX[%02d,%02d,%02d]: cnt=%d dma=%pad host=%p   H_RD=%d H_WR=%d FL_RD=%d FL_WR=%d RX_RD=%d RX_WR=%d\n",
  68                    rx_ring->idx, rx_ring->fl_qcidx, rx_ring->rx_qcidx,
  69                    rx_ring->cnt, &rx_ring->dma, rx_ring->rxds,
  70                    rx_ring->rd_p, rx_ring->wr_p,
  71                    fl_rd_p, fl_wr_p, rx_rd_p, rx_wr_p);
  72
  73         for (i = 0; i < rxd_cnt; i++) {
  74                 rxd = &rx_ring->rxds[i];
  75                 seq_printf(file, "%04d: 0x%08x 0x%08x", i,
  76                            rxd->vals[0], rxd->vals[1]);
  77
  78                 frag = READ_ONCE(rx_ring->rxbufs[i].frag);
  79                 if (frag)
  80                         seq_printf(file, " frag=%p", frag);
  81
  82                 if (rx_ring->rxbufs[i].dma_addr)
  83                         seq_printf(file, " dma_addr=%pad",
  84                                    &rx_ring->rxbufs[i].dma_addr);
  85
  86                 if (i == rx_ring->rd_p % rxd_cnt)
  87                         seq_puts(file, " H_RD ");
  88                 if (i == rx_ring->wr_p % rxd_cnt)
  89                         seq_puts(file, " H_WR ");
  90                 if (i == fl_rd_p % rxd_cnt)
  91                         seq_puts(file, " FL_RD");
  92                 if (i == fl_wr_p % rxd_cnt)
  93                         seq_puts(file, " FL_WR");
  94                 if (i == rx_rd_p % rxd_cnt)
  95                         seq_puts(file, " RX_RD");
  96                 if (i == rx_wr_p % rxd_cnt)
  97                         seq_puts(file, " RX_WR");
  98
  99                 seq_putc(file, '\n');
 100         }
 101 out:
 102         rtnl_unlock();
 103         return 0;
 104 }
 105
 106 static int nfp_net_debugfs_rx_q_open(struct inode *inode, struct file *f)
 107 {
 108         return single_open(f, nfp_net_debugfs_rx_q_read, inode->i_private);
 109 }
 110
 111 static const struct file_operations nfp_rx_q_fops = {
 112         .owner = THIS_MODULE,
 113         .open = nfp_net_debugfs_rx_q_open,
 114         .release = single_release,
 115         .read = seq_read,
 116         .llseek = seq_lseek
 117 };
 118
 119 static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f);
 120
 121 static const struct file_operations nfp_tx_q_fops = {
 122         .owner = THIS_MODULE,
 123         .open = nfp_net_debugfs_tx_q_open,
 124         .release = single_release,
 125         .read = seq_read,
 126         .llseek = seq_lseek
 127 };
 128
 129 static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 130 {
 131         struct nfp_net_r_vector *r_vec = file->private;
 132         struct nfp_net_tx_ring *tx_ring;
 133         struct nfp_net_tx_desc *txd;
 134         int d_rd_p, d_wr_p, txd_cnt;
 135         struct sk_buff *skb;
 136         struct nfp_net *nn;
 137         int i;
 138
 139         rtnl_lock();
 140
 141         if (debugfs_real_fops(file->file) == &nfp_tx_q_fops)
 142                 tx_ring = r_vec->tx_ring;
 143         else
 144                 tx_ring = r_vec->xdp_ring;
 145         if (!r_vec->nfp_net || !tx_ring)
 146                 goto out;
 147         nn = r_vec->nfp_net;
 148         if (!netif_running(nn->netdev))
 149                 goto out;
 150
 151         txd_cnt = tx_ring->cnt;
 152
 153         d_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
 154         d_wr_p = nfp_qcp_wr_ptr_read(tx_ring->qcp_q);
 155
 156         seq_printf(file, "TX[%02d,%02d%s]: cnt=%d dma=%pad host=%p   H_RD=%d H_WR=%d D_RD=%d D_WR=%d\n",
 157                    tx_ring->idx, tx_ring->qcidx,
 158                    tx_ring == r_vec->tx_ring ? "" : "xdp",
 159                    tx_ring->cnt, &tx_ring->dma, tx_ring->txds,
 160                    tx_ring->rd_p, tx_ring->wr_p, d_rd_p, d_wr_p);
 161
 162         for (i = 0; i < txd_cnt; i++) {
 163                 txd = &tx_ring->txds[i];
 164                 seq_printf(file, "%04d: 0x%08x 0x%08x 0x%08x 0x%08x", i,
 165                            txd->vals[0], txd->vals[1],
 166                            txd->vals[2], txd->vals[3]);
 167
 168                 skb = READ_ONCE(tx_ring->txbufs[i].skb);
 169                 if (skb) {
 170                         if (tx_ring == r_vec->tx_ring)
 171                                 seq_printf(file, " skb->head=%p skb->data=%p",
 172                                            skb->head, skb->data);
 173                         else
 174                                 seq_printf(file, " frag=%p", skb);
 175                 }
 176
 177                 if (tx_ring->txbufs[i].dma_addr)
 178                         seq_printf(file, " dma_addr=%pad",
 179                                    &tx_ring->txbufs[i].dma_addr);
 180
 181                 if (i == tx_ring->rd_p % txd_cnt)
 182                         seq_puts(file, " H_RD");
 183                 if (i == tx_ring->wr_p % txd_cnt)
 184                         seq_puts(file, " H_WR");
 185                 if (i == d_rd_p % txd_cnt)
 186                         seq_puts(file, " D_RD");
 187                 if (i == d_wr_p % txd_cnt)
 188                         seq_puts(file, " D_WR");
 189
 190                 seq_putc(file, '\n');
 191         }
 192 out:
 193         rtnl_unlock();
 194         return 0;
 195 }
 196
 197 static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f)
 198 {
 199         return single_open(f, nfp_net_debugfs_tx_q_read, inode->i_private);
 200 }
 201
 202 static const struct file_operations nfp_xdp_q_fops = {
 203         .owner = THIS_MODULE,
 204         .open = nfp_net_debugfs_tx_q_open,
 205         .release = single_release,
 206         .read = seq_read,
 207         .llseek = seq_lseek
 208 };
 209
 210 void nfp_net_debugfs_port_add(struct nfp_net *nn, struct dentry *ddir, int id)
 211 {
 212         struct dentry *queues, *tx, *rx, *xdp;
 213         char name[20];
 214         int i;
 215
 216         if (IS_ERR_OR_NULL(nfp_dir))
 217                 return;
 218
 219         sprintf(name, "port%d", id);
 220         nn->debugfs_dir = debugfs_create_dir(name, ddir);
 221         if (IS_ERR_OR_NULL(nn->debugfs_dir))
 222                 return;
 223
 224         /* Create queue debugging sub-tree */
 225         queues = debugfs_create_dir("queue", nn->debugfs_dir);
 226         if (IS_ERR_OR_NULL(queues))
 227                 return;
 228
 229         rx = debugfs_create_dir("rx", queues);
 230         tx = debugfs_create_dir("tx", queues);
 231         xdp = debugfs_create_dir("xdp", queues);
 232         if (IS_ERR_OR_NULL(rx) || IS_ERR_OR_NULL(tx) || IS_ERR_OR_NULL(xdp))
 233                 return;
 234
 235         for (i = 0; i < min(nn->max_rx_rings, nn->max_r_vecs); i++) {
 236                 sprintf(name, "%d", i);
 237                 debugfs_create_file(name, S_IRUSR, rx,
 238                                     &nn->r_vecs[i], &nfp_rx_q_fops);
 239                 debugfs_create_file(name, S_IRUSR, xdp,
 240                                     &nn->r_vecs[i], &nfp_xdp_q_fops);
 241         }
 242
 243         for (i = 0; i < min(nn->max_tx_rings, nn->max_r_vecs); i++) {
 244                 sprintf(name, "%d", i);
 245                 debugfs_create_file(name, S_IRUSR, tx,
 246                                     &nn->r_vecs[i], &nfp_tx_q_fops);
 247         }
 248 }
 249
 250 struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev)
 251 {
 252         struct dentry *dev_dir;
 253
 254         if (IS_ERR_OR_NULL(nfp_dir))
 255                 return NULL;
 256
 257         dev_dir = debugfs_create_dir(pci_name(pdev), nfp_dir);
 258         if (IS_ERR_OR_NULL(dev_dir))
 259                 return NULL;
 260
 261         return dev_dir;
 262 }
 263
 264 void nfp_net_debugfs_dir_clean(struct dentry **dir)
 265 {
 266         debugfs_remove_recursive(*dir);
 267         *dir = NULL;
 268 }
 269
 270 void nfp_net_debugfs_create(void)
 271 {
 272         nfp_dir = debugfs_create_dir("nfp_net", NULL);
 273 }
 274
 275 void nfp_net_debugfs_destroy(void)
 276 {
 277         debugfs_remove_recursive(nfp_dir);
 278         nfp_dir = NULL;
 279 }