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Message-Id: <1314259229-13767-5-git-send-email-peppe.cavallaro@st.com>
Date: Thu, 25 Aug 2011 10:00:24 +0200
From: Giuseppe CAVALLARO <peppe.cavallaro@...com>
To: netdev@...r.kernel.org
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [PATCH 4/9] stmmac: export DMA TX/RX rings via debugfs.
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: Giuseppe Cavallaro <peppe.cavallaro@...com>
---
drivers/net/stmmac/Kconfig | 3 +-
drivers/net/stmmac/stmmac_main.c | 68 ++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+), 1 deletions(-)
diff --git a/drivers/net/stmmac/Kconfig b/drivers/net/stmmac/Kconfig
index 0a1bd82..57ae3716 100644
--- a/drivers/net/stmmac/Kconfig
+++ b/drivers/net/stmmac/Kconfig
@@ -18,7 +18,8 @@ config STMMAC_MONITOR
-- help
To Enable monitoring via debufs.
The stmmac entry in /sys reports the state of the HW monitoring
- counters (if supported).
+ counters (if supported) and other useful debug information
+ (e.g. DMA TX/RX rings).
config STMMAC_DA
bool "STMMAC DMA arbitration scheme"
diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index 4655fab..50fe89f 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -1430,8 +1430,61 @@ static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
#ifdef CONFIG_STMMAC_MONITOR
static struct dentry *stmmac_fs_dir;
+static struct dentry *stmmac_rings_status;
static struct dentry *stmmac_mmc;
+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,
+};
+
/* To only dump counters > 0 */
static inline void seq_printf_mmc(struct seq_file *seq,
const char *description,
@@ -1656,11 +1709,25 @@ static int stmmac_init_fs(struct net_device *dev)
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;
+ }
+
+ /* Entry to report MAC Management counters */
stmmac_mmc = debugfs_create_file("mmc", S_IRUGO, stmmac_fs_dir, dev,
&stmmac_mmc_fops);
if (!stmmac_mmc || IS_ERR(stmmac_mmc)) {
pr_info("ERROR creating stmmac MMC debugfs file\n");
+ debugfs_remove(stmmac_rings_status);
debugfs_remove(stmmac_fs_dir);
return -ENOMEM;
@@ -1671,6 +1738,7 @@ static int stmmac_init_fs(struct net_device *dev)
static void stmmac_exit_fs(void)
{
+ debugfs_remove(stmmac_rings_status);
debugfs_remove(stmmac_mmc);
debugfs_remove(stmmac_fs_dir);
}
--
1.7.4.4
--
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