at86rf230: add debugfs support

This patch introduce debugfs support for collect trac status stats. To
clear the stats ifdown the interface of at86rf230 and start the
interface again.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/net/ieee802154/Kconfig b/drivers/net/ieee802154/Kconfig
index 1dd5ab8..5a614b2 100644 (file)
--- a/drivers/net/ieee802154/Kconfig
+++ b/drivers/net/ieee802154/Kconfig
@@ -32,6 +32,13 @@ config IEEE802154_AT86RF230
          This driver can also be built as a module. To do so, say M here.
          the module will be called 'at86rf230'.
 
+config IEEE802154_AT86RF230_DEBUGFS
+       depends on IEEE802154_AT86RF230
+       bool "AT86RF230 debugfs interface"
+       depends on DEBUG_FS
+       ---help---
+         This option compiles debugfs code for the at86rf230 driver.
+
 config IEEE802154_MRF24J40
        tristate "Microchip MRF24J40 transceiver driver"
        depends on IEEE802154_DRIVERS && MAC802154

diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 1e71a97..19c16b9 100644 (file)
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -31,6 +31,7 @@
 #include <linux/skbuff.h>
 #include <linux/of_gpio.h>
 #include <linux/ieee802154.h>
+#include <linux/debugfs.h>
 
 #include <net/mac802154.h>
 #include <net/cfg802154.h>
@@ -83,6 +84,15 @@ struct at86rf230_state_change {
        bool irq_enable;
 };
 
+struct at86rf230_trac {
+       u64 success;
+       u64 success_data_pending;
+       u64 success_wait_for_ack;
+       u64 channel_access_failure;
+       u64 no_ack;
+       u64 invalid;
+};
+
 struct at86rf230_local {
        struct spi_device *spi;
 
@@ -103,6 +113,8 @@ struct at86rf230_local {
        u8 tx_retry;
        struct sk_buff *tx_skb;
        struct at86rf230_state_change tx;
+
+       struct at86rf230_trac trac;
 };
 
 #define AT86RF2XX_NUMREGS 0x3F
@@ -660,6 +672,31 @@ at86rf230_tx_trac_check(void *context)
        struct at86rf230_state_change *ctx = context;
        struct at86rf230_local *lp = ctx->lp;
 
+       if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
+               u8 trac = TRAC_MASK(ctx->buf[1]);
+
+               switch (trac) {
+               case TRAC_SUCCESS:
+                       lp->trac.success++;
+                       break;
+               case TRAC_SUCCESS_DATA_PENDING:
+                       lp->trac.success_data_pending++;
+                       break;
+               case TRAC_CHANNEL_ACCESS_FAILURE:
+                       lp->trac.channel_access_failure++;
+                       break;
+               case TRAC_NO_ACK:
+                       lp->trac.no_ack++;
+                       break;
+               case TRAC_INVALID:
+                       lp->trac.invalid++;
+                       break;
+               default:
+                       WARN_ONCE(1, "received tx trac status %d\n", trac);
+                       break;
+               }
+       }
+
        at86rf230_async_state_change(lp, &lp->irq, STATE_TX_ON,
                                     at86rf230_tx_on, true);
 }
@@ -696,13 +733,32 @@ at86rf230_rx_read_frame_complete(void *context)
 }
 
 static void
-at86rf230_rx_read_frame(void *context)
+at86rf230_rx_trac_check(void *context)
 {
        struct at86rf230_state_change *ctx = context;
        struct at86rf230_local *lp = ctx->lp;
        u8 *buf = ctx->buf;
        int rc;
 
+       if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
+               u8 trac = TRAC_MASK(buf[1]);
+
+               switch (trac) {
+               case TRAC_SUCCESS:
+                       lp->trac.success++;
+                       break;
+               case TRAC_SUCCESS_WAIT_FOR_ACK:
+                       lp->trac.success_wait_for_ack++;
+                       break;
+               case TRAC_INVALID:
+                       lp->trac.invalid++;
+                       break;
+               default:
+                       WARN_ONCE(1, "received rx trac status %d\n", trac);
+                       break;
+               }
+       }
+
        buf[0] = CMD_FB;
        ctx->trx.len = AT86RF2XX_MAX_BUF;
        ctx->msg.complete = at86rf230_rx_read_frame_complete;
@@ -715,18 +771,6 @@ at86rf230_rx_read_frame(void *context)
 }
 
 static void
-at86rf230_rx_trac_check(void *context)
-{
-       /* Possible check on trac status here. This could be useful to make
-        * some stats why receive is failed. Not used at the moment, but it's
-        * maybe timing relevant. Datasheet doesn't say anything about this.
-        * The programming guide say do it so.
-        */
-
-       at86rf230_rx_read_frame(context);
-}
-
-static void
 at86rf230_irq_trx_end(struct at86rf230_local *lp)
 {
        if (lp->is_tx) {
@@ -891,6 +935,10 @@ at86rf230_start(struct ieee802154_hw *hw)
 {
        struct at86rf230_local *lp = hw->priv;
 
+       /* reset trac stats on start */
+       if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
+               memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
+
        at86rf230_awake(lp);
        enable_irq(lp->spi->irq);
 
@@ -1591,6 +1639,81 @@ at86rf230_setup_spi_messages(struct at86rf230_local *lp)
        lp->tx.timer.function = at86rf230_async_state_timer;
 }
 
+#ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
+static struct dentry *at86rf230_debugfs_root;
+
+static int at86rf230_stats_show(struct seq_file *file, void *offset)
+{
+       struct at86rf230_local *lp = file->private;
+       int ret;
+
+       ret = seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
+       if (ret < 0)
+               return ret;
+
+       ret = seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
+                        lp->trac.success_data_pending);
+       if (ret < 0)
+               return ret;
+
+       ret = seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
+                        lp->trac.success_wait_for_ack);
+       if (ret < 0)
+               return ret;
+
+       ret = seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
+                        lp->trac.channel_access_failure);
+       if (ret < 0)
+               return ret;
+
+       ret = seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
+       if (ret < 0)
+               return ret;
+
+       return seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
+}
+
+static int at86rf230_stats_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, at86rf230_stats_show, inode->i_private);
+}
+
+static const struct file_operations at86rf230_stats_fops = {
+       .open           = at86rf230_stats_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int at86rf230_debugfs_init(struct at86rf230_local *lp)
+{
+       char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
+       struct dentry *stats;
+
+       strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
+
+       at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
+       if (!at86rf230_debugfs_root)
+               return -ENOMEM;
+
+       stats = debugfs_create_file("trac_stats", S_IRUGO,
+                                   at86rf230_debugfs_root, lp,
+                                   &at86rf230_stats_fops);
+       if (!stats)
+               return -ENOMEM;
+
+       return 0;
+}
+
+static void at86rf230_debugfs_remove(void)
+{
+       debugfs_remove_recursive(at86rf230_debugfs_root);
+}
+#else
+static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
+static void at86rf230_debugfs_remove(void) { }
+#endif
+
 static int at86rf230_probe(struct spi_device *spi)
 {
        struct ieee802154_hw *hw;
@@ -1686,12 +1809,18 @@ static int at86rf230_probe(struct spi_device *spi)
        /* going into sleep by default */
        at86rf230_sleep(lp);
 
-       rc = ieee802154_register_hw(lp->hw);
+       rc = at86rf230_debugfs_init(lp);
        if (rc)
                goto free_dev;
 
+       rc = ieee802154_register_hw(lp->hw);
+       if (rc)
+               goto free_debugfs;
+
        return rc;
 
+free_debugfs:
+       at86rf230_debugfs_remove();
 free_dev:
        ieee802154_free_hw(lp->hw);
 
@@ -1706,6 +1835,7 @@ static int at86rf230_remove(struct spi_device *spi)
        at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
        ieee802154_unregister_hw(lp->hw);
        ieee802154_free_hw(lp->hw);
+       at86rf230_debugfs_remove();
        dev_dbg(&spi->dev, "unregistered at86rf230\n");
 
        return 0;

diff --git a/drivers/net/ieee802154/at86rf230.h b/drivers/net/ieee802154/at86rf230.h
index 1e6d1cc..fd9c1f4 100644 (file)
--- a/drivers/net/ieee802154/at86rf230.h
+++ b/drivers/net/ieee802154/at86rf230.h
@@ -216,5 +216,13 @@
 #define STATE_TRANSITION_IN_PROGRESS 0x1F
 
 #define TRX_STATE_MASK         (0x1F)
+#define TRAC_MASK(x)           ((x & 0xe0) >> 5)
+
+#define TRAC_SUCCESS                   0
+#define TRAC_SUCCESS_DATA_PENDING      1
+#define TRAC_SUCCESS_WAIT_FOR_ACK      2
+#define TRAC_CHANNEL_ACCESS_FAILURE    3
+#define TRAC_NO_ACK                    5
+#define TRAC_INVALID                   7
 
 #endif /* !_AT86RF230_H */