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path: root/drivers/s390/cio
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Diffstat (limited to 'drivers/s390/cio')
-rw-r--r--drivers/s390/cio/qdio.h8
-rw-r--r--drivers/s390/cio/qdio_main.c6
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index c1a70985abfa..af867731a5f4 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -16,6 +16,14 @@
#define QDIO_BUSY_BIT_GIVE_UP 2000000 /* 2 seconds = eternity */
#define QDIO_INPUT_THRESHOLD 500 /* 500 microseconds */
+/*
+ * if an asynchronous HiperSockets queue runs full, the 10 seconds timer wait
+ * till next initiative to give transmitted skbs back to the stack is too long.
+ * Therefore polling is started in case of multicast queue is filled more
+ * than 50 percent.
+ */
+#define QDIO_IQDIO_POLL_LVL 65 /* HS multicast queue */
+
enum qdio_irq_states {
QDIO_IRQ_STATE_INACTIVE,
QDIO_IRQ_STATE_ESTABLISHED,
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index e6eabc853422..9307512132fe 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -851,6 +851,12 @@ static void __qdio_outbound_processing(struct qdio_q *q)
if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
return;
+ if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
+ (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) {
+ tasklet_schedule(&q->tasklet);
+ return;
+ }
+
if (q->u.out.pci_out_enabled)
return;