rt2x00: rework tx status handling in rt2800pci

This patch changes the way tx status reports are handled by rt2800pci.
Previously rt2800pci would sometimes lose tx status reports as the
TX_STA_FIFO register is a fifo of 16 entries that can overflow in case
we don't read it often/fast enough. Since interrupts are disabled in the
device during the execution of the interrupt thread it happend sometimes
under high network and CPU load that processing took too long and a few
tx status reports were dropped by the hw.

To fix this issue the TX_STA_FIFO register is read directly in the
interrupt handler and stored in a kfifo which is large enough to hold
all status reports of all used tx queues.

To process the status reports a new tasklet txstatus_tasklet is used.
Using the already used interrupt thread is not possible since we don't
want to disable the TX_FIFO_STATUS interrupt while processing them and
it is not possible to schedule the interrupt thread multiple times for
execution. A tasklet instead can be scheduled multiple times which
allows to leave the TX_FIFO_STATUS interrupt enabled while a previously
scheduled tasklet is still executing.

In short: All other interrupts are handled in the interrupt thread as
before. Only the TX_FIFO_STATUS interrupt is partly handled in the
interrupt handler and finished in the according tasklet.

One drawback of this patch is that it duplicates some code from
rt2800lib. However, that can be cleaned up in the future once the
rt2800usb and rt2800pci tx status handling converge more.

Using this patch on a Ralink RT3052 embedded board gives me a reliable
wireless connection even under high CPU and network load. I've
transferred several gigabytes without any queue lockups.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 053fdd3bd720..b03e6e41dc1e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -813,6 +813,30 @@ static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 		rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 
 	/*
+	 * Allocate tx status FIFO for driver use.
+	 */
+	if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) &&
+	    rt2x00dev->ops->lib->txstatus_tasklet) {
+		/*
+		 * Allocate txstatus fifo and tasklet, we use a size of 512
+		 * for the kfifo which is big enough to store 512/4=128 tx
+		 * status reports. In the worst case (tx status for all tx
+		 * queues gets reported before we've got a chance to handle
+		 * them) 24*4=384 tx status reports need to be cached.
+		 */
+		status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
+				     GFP_KERNEL);
+		if (status)
+			return status;
+
+		/* tasklet for processing the tx status reports. */
+		tasklet_init(&rt2x00dev->txstatus_tasklet,
+			     rt2x00dev->ops->lib->txstatus_tasklet,
+			     (unsigned long)rt2x00dev);
+
+	}
+
+	/*
 	 * Register HW.
 	 */
 	status = ieee80211_register_hw(rt2x00dev->hw);
@@ -1028,6 +1052,16 @@ void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 	cancel_work_sync(&rt2x00dev->txdone_work);
 
 	/*
+	 * Free the tx status fifo.
+	 */
+	kfifo_free(&rt2x00dev->txstatus_fifo);
+
+	/*
+	 * Kill the tx status tasklet.
+	 */
+	tasklet_kill(&rt2x00dev->txstatus_tasklet);
+
+	/*
 	 * Uninitialize device.
 	 */
 	rt2x00lib_uninitialize(rt2x00dev);