ar71xx: ag71xx: add debugfs entry for [rt]x_ring

[openwrt.git] / target / linux / ar71xx / files / drivers / net / ag71xx / ag71xx_debugfs.c

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c
index 47b7cbd..e41162a 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c
@@ -149,6 +149,94 @@ static const struct file_operations ag71xx_fops_napi_stats = {
        .owner  = THIS_MODULE
 };
 
+#define DESC_PRINT_LEN 64
+
+static ssize_t read_file_ring(struct file *file, char __user *user_buf,
+                             size_t count, loff_t *ppos,
+                             struct ag71xx *ag,
+                             struct ag71xx_ring *ring,
+                             unsigned ring_size,
+                             unsigned desc_reg)
+{
+       char *buf;
+       unsigned int buflen;
+       unsigned int len = 0;
+       unsigned long flags;
+       ssize_t ret;
+       int curr;
+       int dirty;
+       u32 desc_hw;
+       int i;
+
+       buflen = (ring_size * DESC_PRINT_LEN);
+       buf = kmalloc(buflen, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       len += snprintf(buf + len, buflen - len,
+                       "Idx ... %-8s %-8s %-8s %-8s . %-10s\n",
+                       "desc", "next", "data", "ctrl", "timestamp");
+
+       spin_lock_irqsave(&ag->lock, flags);
+
+       curr = (ring->curr % ring_size);
+       dirty = (ring->dirty % ring_size);
+       desc_hw = ag71xx_rr(ag, desc_reg);
+       for (i = 0; i < ring_size; i++) {
+               struct ag71xx_buf *ab = &ring->buf[i];
+
+               len += snprintf(buf + len, buflen - len,
+                       "%3d %c%c%c %08x %08x %08x %08x %c %10lu\n",
+                       i,
+                       (i == curr) ? 'C' : ' ',
+                       (i == dirty) ? 'D' : ' ',
+                       (desc_hw == ab->desc_dma) ? 'H' : ' ',
+                       ab->desc_dma,
+                       ab->desc->next,
+                       ab->desc->data,
+                       ab->desc->ctrl,
+                       (ab->desc->ctrl & DESC_EMPTY) ? 'E' : '*',
+                       ab->timestamp);
+       }
+
+       spin_unlock_irqrestore(&ag->lock, flags);
+
+       ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+       kfree(buf);
+
+       return ret;
+}
+
+static ssize_t read_file_tx_ring(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+       struct ag71xx *ag = file->private_data;
+
+       return read_file_ring(file, user_buf, count, ppos, ag, &ag->tx_ring,
+                             AG71XX_TX_RING_SIZE, AG71XX_REG_TX_DESC);
+}
+
+static const struct file_operations ag71xx_fops_tx_ring = {
+       .open   = ag71xx_debugfs_generic_open,
+       .read   = read_file_tx_ring,
+       .owner  = THIS_MODULE
+};
+
+static ssize_t read_file_rx_ring(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+       struct ag71xx *ag = file->private_data;
+
+       return read_file_ring(file, user_buf, count, ppos, ag, &ag->rx_ring,
+                             AG71XX_RX_RING_SIZE, AG71XX_REG_RX_DESC);
+}
+
+static const struct file_operations ag71xx_fops_rx_ring = {
+       .open   = ag71xx_debugfs_generic_open,
+       .read   = read_file_rx_ring,
+       .owner  = THIS_MODULE
+};
+
 void ag71xx_debugfs_exit(struct ag71xx *ag)
 {
        debugfs_remove_recursive(ag->debug.debugfs_dir);
@@ -165,6 +253,10 @@ int ag71xx_debugfs_init(struct ag71xx *ag)
                            ag, &ag71xx_fops_int_stats);
        debugfs_create_file("napi_stats", S_IRUGO, ag->debug.debugfs_dir,
                            ag, &ag71xx_fops_napi_stats);
+       debugfs_create_file("tx_ring", S_IRUGO, ag->debug.debugfs_dir,
+                           ag, &ag71xx_fops_tx_ring);
+       debugfs_create_file("rx_ring", S_IRUGO, ag->debug.debugfs_dir,
+                           ag, &ag71xx_fops_rx_ring);
 
        return 0;
 }