skge: add a debug interface
Add a debugfs interface to look at internal ring state.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 8f99a06..83d52c8 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2173,6 +2173,16 @@
To compile this driver as a module, choose M here: the module
will be called skge. This is recommended.
+config SKGE_DEBUG
+ bool "Debugging interface"
+ depends on SKGE && DEBUG_FS
+ help
+ This option adds the ability to dump driver state for debugging.
+ The file debugfs/skge/ethX displays the state of the internal
+ transmit and receive rings.
+
+ If unsure, say N.
+
config SKY2
tristate "SysKonnect Yukon2 support"
depends on PCI
diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 953f802..cf7d79b 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -36,6 +36,8 @@
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/dma-mapping.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
#include <linux/mii.h>
#include <asm/irq.h>
@@ -3676,6 +3678,145 @@
return 0;
}
+
+#ifdef CONFIG_SKGE_DEBUG
+
+static struct dentry *skge_debug;
+
+static int skge_debug_show(struct seq_file *seq, void *v)
+{
+ struct net_device *dev = seq->private;
+ const struct skge_port *skge = netdev_priv(dev);
+ const struct skge_hw *hw = skge->hw;
+ const struct skge_element *e;
+
+ if (!netif_running(dev))
+ return -ENETDOWN;
+
+ seq_printf(seq, "IRQ src=%x mask=%x\n", skge_read32(hw, B0_ISRC),
+ skge_read32(hw, B0_IMSK));
+
+ seq_printf(seq, "Tx Ring: (%d)\n", skge_avail(&skge->tx_ring));
+ for (e = skge->tx_ring.to_clean; e != skge->tx_ring.to_use; e = e->next) {
+ const struct skge_tx_desc *t = e->desc;
+ seq_printf(seq, "%#x dma=%#x%08x %#x csum=%#x/%x/%x\n",
+ t->control, t->dma_hi, t->dma_lo, t->status,
+ t->csum_offs, t->csum_write, t->csum_start);
+ }
+
+ seq_printf(seq, "\nRx Ring: \n");
+ for (e = skge->rx_ring.to_clean; ; e = e->next) {
+ const struct skge_rx_desc *r = e->desc;
+
+ if (r->control & BMU_OWN)
+ break;
+
+ seq_printf(seq, "%#x dma=%#x%08x %#x %#x csum=%#x/%x\n",
+ r->control, r->dma_hi, r->dma_lo, r->status,
+ r->timestamp, r->csum1, r->csum1_start);
+ }
+
+ return 0;
+}
+
+static int skge_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, skge_debug_show, inode->i_private);
+}
+
+static const struct file_operations skge_debug_fops = {
+ .owner = THIS_MODULE,
+ .open = skge_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/*
+ * Use network device events to create/remove/rename
+ * debugfs file entries
+ */
+static int skge_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = ptr;
+ struct skge_port *skge;
+ struct dentry *d;
+
+ if (dev->open != &skge_up || !skge_debug)
+ goto done;
+
+ skge = netdev_priv(dev);
+ switch(event) {
+ case NETDEV_CHANGENAME:
+ if (skge->debugfs) {
+ d = debugfs_rename(skge_debug, skge->debugfs,
+ skge_debug, dev->name);
+ if (d)
+ skge->debugfs = d;
+ else {
+ pr_info(PFX "%s: rename failed\n", dev->name);
+ debugfs_remove(skge->debugfs);
+ }
+ }
+ break;
+
+ case NETDEV_GOING_DOWN:
+ if (skge->debugfs) {
+ debugfs_remove(skge->debugfs);
+ skge->debugfs = NULL;
+ }
+ break;
+
+ case NETDEV_UP:
+ d = debugfs_create_file(dev->name, S_IRUGO,
+ skge_debug, dev,
+ &skge_debug_fops);
+ if (!d || IS_ERR(d))
+ pr_info(PFX "%s: debugfs create failed\n",
+ dev->name);
+ else
+ skge->debugfs = d;
+ break;
+ }
+
+done:
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block skge_notifier = {
+ .notifier_call = skge_device_event,
+};
+
+
+static __init void skge_debug_init(void)
+{
+ struct dentry *ent;
+
+ ent = debugfs_create_dir("skge", NULL);
+ if (!ent || IS_ERR(ent)) {
+ pr_info(PFX "debugfs create directory failed\n");
+ return;
+ }
+
+ skge_debug = ent;
+ register_netdevice_notifier(&skge_notifier);
+}
+
+static __exit void skge_debug_cleanup(void)
+{
+ if (skge_debug) {
+ unregister_netdevice_notifier(&skge_notifier);
+ debugfs_remove(skge_debug);
+ skge_debug = NULL;
+ }
+}
+
+#else
+#define skge_debug_init()
+#define skge_debug_cleanup()
+#endif
+
/* Initialize network device */
static struct net_device *skge_devinit(struct skge_hw *hw, int port,
int highmem)
@@ -4040,12 +4181,14 @@
static int __init skge_init_module(void)
{
+ skge_debug_init();
return pci_register_driver(&skge_driver);
}
static void __exit skge_cleanup_module(void)
{
pci_unregister_driver(&skge_driver);
+ skge_debug_cleanup();
}
module_init(skge_init_module);
diff --git a/drivers/net/skge.h b/drivers/net/skge.h
index 5175424..17caccb 100644
--- a/drivers/net/skge.h
+++ b/drivers/net/skge.h
@@ -2469,6 +2469,9 @@
void *mem; /* PCI memory for rings */
dma_addr_t dma;
unsigned long mem_size;
+#ifdef CONFIG_SKGE_DEBUG
+ struct dentry *debugfs;
+#endif
};