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         struct nfp_net_r_vector *r_vec = file->private;
  44         struct nfp_net_rx_ring *rx_ring;
  45         int fl_rd_p, fl_wr_p, rxd_cnt;
  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 (!nfp_net_running(nn))
  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
  65         seq_printf(file, "RX[%02d,%02d]: cnt=%u dma=%pad host=%p   H_RD=%u H_WR=%u FL_RD=%u FL_WR=%u\n",
  66                    rx_ring->idx, rx_ring->fl_qcidx,
  67                    rx_ring->cnt, &rx_ring->dma, rx_ring->rxds,
  68                    rx_ring->rd_p, rx_ring->wr_p, fl_rd_p, fl_wr_p);
  69
  70         for (i = 0; i < rxd_cnt; i++) {
  71                 rxd = &rx_ring->rxds[i];
  72                 seq_printf(file, "%04d: 0x%08x 0x%08x", i,
  73                            rxd->vals[0], rxd->vals[1]);
  74
  75                 frag = READ_ONCE(rx_ring->rxbufs[i].frag);
  76                 if (frag)
  77                         seq_printf(file, " frag=%p", frag);
  78
  79                 if (rx_ring->rxbufs[i].dma_addr)
  80                         seq_printf(file, " dma_addr=%pad",
  81                                    &rx_ring->rxbufs[i].dma_addr);
  82
  83                 if (i == rx_ring->rd_p % rxd_cnt)
  84                         seq_puts(file, " H_RD ");
  85                 if (i == rx_ring->wr_p % rxd_cnt)
  86                         seq_puts(file, " H_WR ");
  87                 if (i == fl_rd_p % rxd_cnt)
  88                         seq_puts(file, " FL_RD");
  89                 if (i == fl_wr_p % rxd_cnt)
  90                         seq_puts(file, " FL_WR");
  91
  92                 seq_putc(file, '\n');
  93         }
  94 out:
  95         rtnl_unlock();
  96         return 0;
  97 }
  98
  99 static int nfp_net_debugfs_rx_q_open(struct inode *inode, struct file *f)
 100 {
 101         return single_open(f, nfp_net_debugfs_rx_q_read, inode->i_private);
 102 }
 103
 104 static const struct file_operations nfp_rx_q_fops = {
 105         .owner = THIS_MODULE,
 106         .open = nfp_net_debugfs_rx_q_open,
 107         .release = single_release,
 108         .read = seq_read,
 109         .llseek = seq_lseek
 110 };
 111
 112 static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f);
 113
 114 static const struct file_operations nfp_tx_q_fops = {
 115         .owner = THIS_MODULE,
 116         .open = nfp_net_debugfs_tx_q_open,
 117         .release = single_release,
 118         .read = seq_read,
 119         .llseek = seq_lseek
 120 };
 121
 122 static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 123 {
 124         struct nfp_net_r_vector *r_vec = file->private;
 125         struct nfp_net_tx_ring *tx_ring;
 126         struct nfp_net_tx_desc *txd;
 127         int d_rd_p, d_wr_p, txd_cnt;
 128         struct nfp_net *nn;
 129         int i;
 130
 131         rtnl_lock();
 132
 133         if (debugfs_real_fops(file->file) == &nfp_tx_q_fops)
 134                 tx_ring = r_vec->tx_ring;
 135         else
 136                 tx_ring = r_vec->xdp_ring;
 137         if (!r_vec->nfp_net || !tx_ring)
 138                 goto out;
 139         nn = r_vec->nfp_net;
 140         if (!nfp_net_running(nn))
 141                 goto out;
 142
 143         txd_cnt = tx_ring->cnt;
 144
 145         d_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
 146         d_wr_p = nfp_qcp_wr_ptr_read(tx_ring->qcp_q);
 147
 148         seq_printf(file, "TX[%02d,%02d%s]: cnt=%u dma=%pad host=%p   H_RD=%u H_WR=%u D_RD=%u D_WR=%u\n",
 149                    tx_ring->idx, tx_ring->qcidx,
 150                    tx_ring == r_vec->tx_ring ? "" : "xdp",
 151                    tx_ring->cnt, &tx_ring->dma, tx_ring->txds,
 152                    tx_ring->rd_p, tx_ring->wr_p, d_rd_p, d_wr_p);
 153
 154         for (i = 0; i < txd_cnt; i++) {
 155                 txd = &tx_ring->txds[i];
 156                 seq_printf(file, "%04d: 0x%08x 0x%08x 0x%08x 0x%08x", i,
 157                            txd->vals[0], txd->vals[1],
 158                            txd->vals[2], txd->vals[3]);
 159
 160                 if (tx_ring == r_vec->tx_ring) {
 161                         struct sk_buff *skb = READ_ONCE(tx_ring->txbufs[i].skb);
 162
 163                         if (skb)
 164                                 seq_printf(file, " skb->head=%p skb->data=%p",
 165                                            skb->head, skb->data);
 166                 } else {
 167                         seq_printf(file, " frag=%p",
 168                                    READ_ONCE(tx_ring->txbufs[i].frag));
 169                 }
 170
 171                 if (tx_ring->txbufs[i].dma_addr)
 172                         seq_printf(file, " dma_addr=%pad",
 173                                    &tx_ring->txbufs[i].dma_addr);
 174
 175                 if (i == tx_ring->rd_p % txd_cnt)
 176                         seq_puts(file, " H_RD");
 177                 if (i == tx_ring->wr_p % txd_cnt)
 178                         seq_puts(file, " H_WR");
 179                 if (i == d_rd_p % txd_cnt)
 180                         seq_puts(file, " D_RD");
 181                 if (i == d_wr_p % txd_cnt)
 182                         seq_puts(file, " D_WR");
 183
 184                 seq_putc(file, '\n');
 185         }
 186 out:
 187         rtnl_unlock();
 188         return 0;
 189 }
 190
 191 static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f)
 192 {
 193         return single_open(f, nfp_net_debugfs_tx_q_read, inode->i_private);
 194 }
 195
 196 static const struct file_operations nfp_xdp_q_fops = {
 197         .owner = THIS_MODULE,
 198         .open = nfp_net_debugfs_tx_q_open,
 199         .release = single_release,
 200         .read = seq_read,
 201         .llseek = seq_lseek
 202 };
 203
 204 void nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir, int id)
 205 {
 206         struct dentry *queues, *tx, *rx, *xdp;
 207         char name[20];
 208         int i;
 209
 210         if (IS_ERR_OR_NULL(nfp_dir))
 211                 return;
 212
 213         if (nfp_net_is_data_vnic(nn))
 214                 sprintf(name, "vnic%d", id);
 215         else
 216                 strcpy(name, "ctrl-vnic");
 217         nn->debugfs_dir = debugfs_create_dir(name, ddir);
 218         if (IS_ERR_OR_NULL(nn->debugfs_dir))
 219                 return;
 220
 221         /* Create queue debugging sub-tree */
 222         queues = debugfs_create_dir("queue", nn->debugfs_dir);
 223         if (IS_ERR_OR_NULL(queues))
 224                 return;
 225
 226         rx = debugfs_create_dir("rx", queues);
 227         tx = debugfs_create_dir("tx", queues);
 228         xdp = debugfs_create_dir("xdp", queues);
 229         if (IS_ERR_OR_NULL(rx) || IS_ERR_OR_NULL(tx) || IS_ERR_OR_NULL(xdp))
 230                 return;
 231
 232         for (i = 0; i < min(nn->max_rx_rings, nn->max_r_vecs); i++) {
 233                 sprintf(name, "%d", i);
 234                 debugfs_create_file(name, S_IRUSR, rx,
 235                                     &nn->r_vecs[i], &nfp_rx_q_fops);
 236                 debugfs_create_file(name, S_IRUSR, xdp,
 237                                     &nn->r_vecs[i], &nfp_xdp_q_fops);
 238         }
 239
 240         for (i = 0; i < min(nn->max_tx_rings, nn->max_r_vecs); i++) {
 241                 sprintf(name, "%d", i);
 242                 debugfs_create_file(name, S_IRUSR, tx,
 243                                     &nn->r_vecs[i], &nfp_tx_q_fops);
 244         }
 245 }
 246
 247 struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev)
 248 {
 249         struct dentry *dev_dir;
 250
 251         if (IS_ERR_OR_NULL(nfp_dir))
 252                 return NULL;
 253
 254         dev_dir = debugfs_create_dir(pci_name(pdev), nfp_dir);
 255         if (IS_ERR_OR_NULL(dev_dir))
 256                 return NULL;
 257
 258         return dev_dir;
 259 }
 260
 261 void nfp_net_debugfs_dir_clean(struct dentry **dir)
 262 {
 263         debugfs_remove_recursive(*dir);
 264         *dir = NULL;
 265 }
 266
 267 void nfp_net_debugfs_create(void)
 268 {
 269         nfp_dir = debugfs_create_dir("nfp_net", NULL);
 270 }
 271
 272 void nfp_net_debugfs_destroy(void)
 273 {
 274         debugfs_remove_recursive(nfp_dir);
 275         nfp_dir = NULL;
 276 }