/* Intel Ethernet Switch Host Interface Driver
 * Copyright(c) 2013 - 2015 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 */

#ifdef CONFIG_DEBUG_FS

#include "fm10k.h"

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static struct dentry *dbg_root;

/* Descriptor Seq Functions */

static void *fm10k_dbg_desc_seq_start(struct seq_file *s, loff_t *pos)
{
	struct fm10k_ring *ring = s->private;

	return (*pos < ring->count) ? pos : NULL;
}

static void *fm10k_dbg_desc_seq_next(struct seq_file *s,
				     void __always_unused *v,
				     loff_t *pos)
{
	struct fm10k_ring *ring = s->private;

	return (++(*pos) < ring->count) ? pos : NULL;
}

static void fm10k_dbg_desc_seq_stop(struct seq_file __always_unused *s,
				    void __always_unused *v)
{
	/* Do nothing. */
}

static void fm10k_dbg_desc_break(struct seq_file *s, int i)
{
	while (i--)
		seq_puts(s, "-");

	seq_puts(s, "\n");
}

static int fm10k_dbg_tx_desc_seq_show(struct seq_file *s, void *v)
{
	struct fm10k_ring *ring = s->private;
	int i = *(loff_t *)v;
	static const char tx_desc_hdr[] =
		"DES BUFFER_ADDRESS     LENGTH VLAN   MSS    HDRLEN FLAGS\n";

	/* Generate header */
	if (!i) {
		seq_printf(s, tx_desc_hdr);
		fm10k_dbg_desc_break(s, sizeof(tx_desc_hdr) - 1);
	}

	/* Validate descriptor allocation */
	if (!ring->desc) {
		seq_printf(s, "%03X Descriptor ring not allocated.\n", i);
	} else {
		struct fm10k_tx_desc *txd = FM10K_TX_DESC(ring, i);

		seq_printf(s, "%03X %#018llx %#06x %#06x %#06x %#06x %#04x\n",
			   i, txd->buffer_addr, txd->buflen, txd->vlan,
			   txd->mss, txd->hdrlen, txd->flags);
	}

	return 0;
}

static int fm10k_dbg_rx_desc_seq_show(struct seq_file *s, void *v)
{
	struct fm10k_ring *ring = s->private;
	int i = *(loff_t *)v;
	static const char rx_desc_hdr[] =
	"DES DATA       RSS        STATERR    LENGTH VLAN   DGLORT SGLORT TIMESTAMP\n";

	/* Generate header */
	if (!i) {
		seq_printf(s, rx_desc_hdr);
		fm10k_dbg_desc_break(s, sizeof(rx_desc_hdr) - 1);
	}

	/* Validate descriptor allocation */
	if (!ring->desc) {
		seq_printf(s, "%03X Descriptor ring not allocated.\n", i);
	} else {
		union fm10k_rx_desc *rxd = FM10K_RX_DESC(ring, i);

		seq_printf(s,
			   "%03X %#010x %#010x %#010x %#06x %#06x %#06x %#06x %#018llx\n",
			   i, rxd->d.data, rxd->d.rss, rxd->d.staterr,
			   rxd->w.length, rxd->w.vlan, rxd->w.dglort,
			   rxd->w.sglort, rxd->q.timestamp);
	}

	return 0;
}

static const struct seq_operations fm10k_dbg_tx_desc_seq_ops = {
	.start = fm10k_dbg_desc_seq_start,
	.next  = fm10k_dbg_desc_seq_next,
	.stop  = fm10k_dbg_desc_seq_stop,
	.show  = fm10k_dbg_tx_desc_seq_show,
};

static const struct seq_operations fm10k_dbg_rx_desc_seq_ops = {
	.start = fm10k_dbg_desc_seq_start,
	.next  = fm10k_dbg_desc_seq_next,
	.stop  = fm10k_dbg_desc_seq_stop,
	.show  = fm10k_dbg_rx_desc_seq_show,
};

static int fm10k_dbg_desc_open(struct inode *inode, struct file *filep)
{
	struct fm10k_ring *ring = inode->i_private;
	struct fm10k_q_vector *q_vector = ring->q_vector;
	const struct seq_operations *desc_seq_ops;
	int err;

	if (ring < q_vector->rx.ring)
		desc_seq_ops = &fm10k_dbg_tx_desc_seq_ops;
	else
		desc_seq_ops = &fm10k_dbg_rx_desc_seq_ops;

	err = seq_open(filep, desc_seq_ops);
	if (err)
		return err;

	((struct seq_file *)filep->private_data)->private = ring;

	return 0;
}

static const struct file_operations fm10k_dbg_desc_fops = {
	.owner   = THIS_MODULE,
	.open    = fm10k_dbg_desc_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

/**
 * fm10k_dbg_q_vector_init - setup debugfs for the q_vectors
 * @q_vector: q_vector to allocate directories for
 *
 * A folder is created for each q_vector found. In each q_vector
 * folder, a debugfs file is created for each tx and rx ring
 * allocated to the q_vector.
 **/
void fm10k_dbg_q_vector_init(struct fm10k_q_vector *q_vector)
{
	struct fm10k_intfc *interface = q_vector->interface;
	char name[16];
	int i;

	if (!interface->dbg_intfc)
		return;

	/* Generate a folder for each q_vector */
	snprintf(name, sizeof(name), "q_vector.%03d", q_vector->v_idx);

	q_vector->dbg_q_vector = debugfs_create_dir(name, interface->dbg_intfc);
	if (!q_vector->dbg_q_vector)
		return;

	/* Generate a file for each rx ring in the q_vector */
	for (i = 0; i < q_vector->tx.count; i++) {
		struct fm10k_ring *ring = &q_vector->tx.ring[i];

		snprintf(name, sizeof(name), "tx_ring.%03d", ring->queue_index);

		debugfs_create_file(name, 0600,
				    q_vector->dbg_q_vector, ring,
				    &fm10k_dbg_desc_fops);
	}

	/* Generate a file for each rx ring in the q_vector */
	for (i = 0; i < q_vector->rx.count; i++) {
		struct fm10k_ring *ring = &q_vector->rx.ring[i];

		snprintf(name, sizeof(name), "rx_ring.%03d", ring->queue_index);

		debugfs_create_file(name, 0600,
				    q_vector->dbg_q_vector, ring,
				    &fm10k_dbg_desc_fops);
	}
}

/**
 * fm10k_dbg_free_q_vector_dir - setup debugfs for the q_vectors
 * @q_vector: q_vector to allocate directories for
 **/
void fm10k_dbg_q_vector_exit(struct fm10k_q_vector *q_vector)
{
	struct fm10k_intfc *interface = q_vector->interface;

	if (interface->dbg_intfc)
		debugfs_remove_recursive(q_vector->dbg_q_vector);
	q_vector->dbg_q_vector = NULL;
}

/**
 * fm10k_dbg_intfc_init - setup the debugfs directory for the intferface
 * @interface: the interface that is starting up
 **/

void fm10k_dbg_intfc_init(struct fm10k_intfc *interface)
{
	const char *name = pci_name(interface->pdev);

	if (dbg_root)
		interface->dbg_intfc = debugfs_create_dir(name, dbg_root);
}

/**
 * fm10k_dbg_intfc_exit - clean out the interface's debugfs entries
 * @interface: the interface that is stopping
 **/
void fm10k_dbg_intfc_exit(struct fm10k_intfc *interface)
{
	if (dbg_root)
		debugfs_remove_recursive(interface->dbg_intfc);
	interface->dbg_intfc = NULL;
}

/**
 * fm10k_dbg_init - start up debugfs for the driver
 **/
void fm10k_dbg_init(void)
{
	dbg_root = debugfs_create_dir(fm10k_driver_name, NULL);
}

/**
 * fm10k_dbg_exit - clean out the driver's debugfs entries
 **/
void fm10k_dbg_exit(void)
{
	debugfs_remove_recursive(dbg_root);
	dbg_root = NULL;
}

#endif /* CONFIG_DEBUG_FS */