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Commit 7ac29055 authored by Giuseppe CAVALLARO's avatar Giuseppe CAVALLARO Committed by David S. Miller
Browse files

stmmac: export DMA TX/RX rings via debugfs (v3) 



This patch adds the following debugFs entry to dump the
RX/TX DMA rings:

/sys/kernel/debug/stmmaceth/descriptors_status

This is an example:

=======================
  RX descriptor ring
=======================
[0] DES0=0x85ee0320 DES1=0x1fff1fff BUF1=0x5fae2022 BUF2=0x0
[1] DES0=0x85ee0320 DES1=0x1fff1fff BUF1=0x5fae0022 BUF2=0x0
[2] DES0=0x81460320 DES1=0x1fff1fff BUF1=0x5f9dd022 BUF2=0x0

Signed-off-by: default avatarGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1c901a46

drivers/net/ethernet/stmicro/stmmac/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -11,6 +11,13 @@ config STMMAC_ETH 


if STMMAC_ETH



config STMMAC_DEBUG_FS

	bool "Enable monitoring via sysFS "

	default n

	depends on STMMAC_ETH && DEBUG_FS

	-- help

	  The stmmac entry in /sys reports DMA TX/RX rings.



config STMMAC_DA

	bool "STMMAC DMA arbitration scheme"

	default n

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+105 −0
Original line number Diff line number Diff line
@@ -48,6 +48,10 @@ 
#include <linux/slab.h>

#include <linux/prefetch.h>

#include "stmmac.h"

#ifdef CONFIG_STMMAC_DEBUG_FS

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#endif



#define STMMAC_RESOURCE_NAME	"stmmaceth"
@@ -1425,6 +1429,96 @@ static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 
	return ret;

}



#ifdef CONFIG_STMMAC_DEBUG_FS

static struct dentry *stmmac_fs_dir;

static struct dentry *stmmac_rings_status;



static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)

{

	struct tmp_s {

		u64 a;

		unsigned int b;

		unsigned int c;

	};

	int i;

	struct net_device *dev = seq->private;

	struct stmmac_priv *priv = netdev_priv(dev);



	seq_printf(seq, "=======================\n");

	seq_printf(seq, " RX descriptor ring\n");

	seq_printf(seq, "=======================\n");



	for (i = 0; i < priv->dma_rx_size; i++) {

		struct tmp_s *x = (struct tmp_s *)(priv->dma_rx + i);

		seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",

			   i, (unsigned int)(x->a),

			   (unsigned int)((x->a) >> 32), x->b, x->c);

		seq_printf(seq, "\n");

	}



	seq_printf(seq, "\n");

	seq_printf(seq, "=======================\n");

	seq_printf(seq, "  TX descriptor ring\n");

	seq_printf(seq, "=======================\n");



	for (i = 0; i < priv->dma_tx_size; i++) {

		struct tmp_s *x = (struct tmp_s *)(priv->dma_tx + i);

		seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",

			   i, (unsigned int)(x->a),

			   (unsigned int)((x->a) >> 32), x->b, x->c);

		seq_printf(seq, "\n");

	}



	return 0;

}



static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)

{

	return single_open(file, stmmac_sysfs_ring_read, inode->i_private);

}



static const struct file_operations stmmac_rings_status_fops = {

	.owner = THIS_MODULE,

	.open = stmmac_sysfs_ring_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = seq_release,

};



static int stmmac_init_fs(struct net_device *dev)

{

	/* Create debugfs entries */

	stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);



	if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {

		pr_err("ERROR %s, debugfs create directory failed\n",

		       STMMAC_RESOURCE_NAME);



		return -ENOMEM;

	}



	/* Entry to report DMA RX/TX rings */

	stmmac_rings_status = debugfs_create_file("descriptors_status",

					   S_IRUGO, stmmac_fs_dir, dev,

					   &stmmac_rings_status_fops);



	if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {

		pr_info("ERROR creating stmmac ring debugfs file\n");

		debugfs_remove(stmmac_fs_dir);



		return -ENOMEM;

	}



	return 0;

}



static void stmmac_exit_fs(void)

{

	debugfs_remove(stmmac_rings_status);

	debugfs_remove(stmmac_fs_dir);

}

#endif /* CONFIG_STMMAC_DEBUG_FS */



static const struct net_device_ops stmmac_netdev_ops = {

	.ndo_open = stmmac_open,

	.ndo_start_xmit = stmmac_xmit,
@@ -1651,6 +1745,13 @@ static int stmmac_dvr_probe(struct platform_device *pdev) 
	if (ret < 0)

		goto out_unregister;

	pr_debug("registered!\n");



#ifdef CONFIG_STMMAC_DEBUG_FS

	ret = stmmac_init_fs(ndev);

	if (ret < 0)

		pr_warning("\tFailed debugFS registration");

#endif



	return 0;



out_unregister:
@@ -1703,6 +1804,10 @@ static int stmmac_dvr_remove(struct platform_device *pdev) 
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	release_mem_region(res->start, resource_size(res));



#ifdef CONFIG_STMMAC_DEBUG_FS

	stmmac_exit_fs();

#endif



	free_netdev(ndev);



	return 0;