b43: Add optional verbose runtime statistics

This adds support for verbose runtime statistics.
It defaults to off and must be enabled in debugfs, if desired.
The first measurement may be incorrect, because statistics are not cleared
after they got enabled through debugfs.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 43 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h
index 89ccf0d50f3..fa1549a03c7 100644
--- a/drivers/net/wireless/b43/b43.h
+++ b/drivers/net/wireless/b43/b43.h
@@ -817,6 +817,10 @@ struct b43_wldev {
         /* Debugging stuff follows. */
 #ifdef CONFIG_B43_DEBUG
         struct b43_dfsentry *dfsentry;
+        unsigned int irq_count;
+        unsigned int irq_bit_count[32];
+        unsigned int tx_count;
+        unsigned int rx_count;
 #endif
 };
 
diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c
index 8f64943e3f6..80b19a44a40 100644
--- a/drivers/net/wireless/b43/debugfs.c
+++ b/drivers/net/wireless/b43/debugfs.c
@@ -689,6 +689,7 @@ static void b43_add_dynamic_debug(struct b43_wldev *dev)
         add_dyn_dbg("debug_lo", B43_DBG_LO, 0);
         add_dyn_dbg("debug_firmware", B43_DBG_FIRMWARE, 0);
         add_dyn_dbg("debug_keys", B43_DBG_KEYS, 0);
+        add_dyn_dbg("debug_verbose_stats", B43_DBG_VERBOSESTATS, 0);
 
 #undef add_dyn_dbg
 }
diff --git a/drivers/net/wireless/b43/debugfs.h b/drivers/net/wireless/b43/debugfs.h
index e47b4b488b0..822aad8842f 100644
--- a/drivers/net/wireless/b43/debugfs.h
+++ b/drivers/net/wireless/b43/debugfs.h
@@ -13,6 +13,7 @@ enum b43_dyndbg {		/* Dynamic debugging features */
         B43_DBG_LO,
         B43_DBG_FIRMWARE,
         B43_DBG_KEYS,
+        B43_DBG_VERBOSESTATS,
         __B43_NR_DYNDBG,
 };
 
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 7d22dadfd89..6468bbeba68 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -1830,6 +1830,16 @@ static void b43_do_interrupt_thread(struct b43_wldev *dev)
 
         /* Re-enable interrupts on the device by restoring the current interrupt mask. */
         b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask);
+
+#if B43_DEBUG
+        if (b43_debug(dev, B43_DBG_VERBOSESTATS)) {
+                dev->irq_count++;
+                for (i = 0; i < ARRAY_SIZE(dev->irq_bit_count); i++) {
+                        if (reason & (1 << i))
+                                dev->irq_bit_count[i]++;
+                }
+        }
+#endif
 }
 
 /* Interrupt thread handler. Handles device interrupts in thread context. */
@@ -2893,6 +2903,27 @@ static void b43_periodic_every15sec(struct b43_wldev *dev)
 
         atomic_set(&phy->txerr_cnt, B43_PHY_TX_BADNESS_LIMIT);
         wmb();
+
+#if B43_DEBUG
+        if (b43_debug(dev, B43_DBG_VERBOSESTATS)) {
+                unsigned int i;
+
+                b43dbg(dev->wl, "Stats: %7u IRQs/sec, %7u TX/sec, %7u RX/sec\n",
+                       dev->irq_count / 15,
+                       dev->tx_count / 15,
+                       dev->rx_count / 15);
+                dev->irq_count = 0;
+                dev->tx_count = 0;
+                dev->rx_count = 0;
+                for (i = 0; i < ARRAY_SIZE(dev->irq_bit_count); i++) {
+                        if (dev->irq_bit_count[i]) {
+                                b43dbg(dev->wl, "Stats: %7u IRQ-%02u/sec (0x%08X)\n",
+                                       dev->irq_bit_count[i] / 15, i, (1 << i));
+                                dev->irq_bit_count[i] = 0;
+                        }
+                }
+        }
+#endif
 }
 
 static void do_periodic_work(struct b43_wldev *dev)
@@ -3092,6 +3123,9 @@ static void b43_tx_work(struct work_struct *work)
                         dev_kfree_skb(skb); /* Drop it */
         }
 
+#if B43_DEBUG
+        dev->tx_count++;
+#endif
         mutex_unlock(&wl->mutex);
 }
 
diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index c403c616d3b..ac9f600995e 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -692,6 +692,9 @@ void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
         memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
         ieee80211_rx(dev->wl->hw, skb);
 
+#if B43_DEBUG
+        dev->rx_count++;
+#endif
         return;
 drop:
         b43dbg(dev->wl, "RX: Packet dropped\n");