[S390] qdio: add counter for input queue full condition
Add a counter to the qdio performance statistics that indicates that no
free buffers were left in the input queue. If the counter gets increased
it means that the qdio adapter filled all available buffers and possibly
had more buffers ready but could not transmit them.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 4be6e84..b2275c5 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -486,7 +486,8 @@
case SLSB_P_INPUT_PRIMED:
inbound_primed(q, count);
q->first_to_check = add_buf(q->first_to_check, count);
- atomic_sub(count, &q->nr_buf_used);
+ if (atomic_sub(count, &q->nr_buf_used) == 0)
+ qdio_perf_stat_inc(&perf_stats.inbound_queue_full);
break;
case SLSB_P_INPUT_ERROR:
announce_buffer_error(q, count);