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authorJulian Wiedmann <jwi@linux.vnet.ibm.com>2017-06-06 14:33:47 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-06 13:05:00 -0400
commit664e42ac8b1bc39540ac9d657efa45c3e213e6c2 (patch)
tree481455c2f78902a237540c44ecfe0fcb78c10104 /drivers/s390
parent84616e86f830490c4bbf93ddc1e374cd61865060 (diff)
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s390/qeth: consolidate pack buffer flushing
qeth_switch_to_nonpacking_if_needed() contains an open-coded version of qeth_flush_buffers_on_no_pci(). Extract a single helper instead. Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/net/qeth_core_main.c65
1 files changed, 25 insertions, 40 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index dba7d00715e3..a159eb900d03 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3347,6 +3347,28 @@ static void qeth_handle_send_error(struct qeth_card *card,
(u16)qdio_err, (u8)sbalf15);
}
+/**
+ * qeth_prep_flush_pack_buffer - Prepares flushing of a packing buffer.
+ * @queue: queue to check for packing buffer
+ *
+ * Returns number of buffers that were prepared for flush.
+ */
+static int qeth_prep_flush_pack_buffer(struct qeth_qdio_out_q *queue)
+{
+ struct qeth_qdio_out_buffer *buffer;
+
+ buffer = queue->bufs[queue->next_buf_to_fill];
+ if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) &&
+ (buffer->next_element_to_fill > 0)) {
+ /* it's a packing buffer */
+ atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED);
+ queue->next_buf_to_fill =
+ (queue->next_buf_to_fill + 1) % QDIO_MAX_BUFFERS_PER_Q;
+ return 1;
+ }
+ return 0;
+}
+
/*
* Switched to packing state if the number of used buffers on a queue
* reaches a certain limit.
@@ -3373,9 +3395,6 @@ static void qeth_switch_to_packing_if_needed(struct qeth_qdio_out_q *queue)
*/
static int qeth_switch_to_nonpacking_if_needed(struct qeth_qdio_out_q *queue)
{
- struct qeth_qdio_out_buffer *buffer;
- int flush_count = 0;
-
if (queue->do_pack) {
if (atomic_read(&queue->used_buffers)
<= QETH_LOW_WATERMARK_PACK) {
@@ -3384,42 +3403,9 @@ static int qeth_switch_to_nonpacking_if_needed(struct qeth_qdio_out_q *queue)
if (queue->card->options.performance_stats)
queue->card->perf_stats.sc_p_dp++;
queue->do_pack = 0;
- /* flush packing buffers */
- buffer = queue->bufs[queue->next_buf_to_fill];
- if ((atomic_read(&buffer->state) ==
- QETH_QDIO_BUF_EMPTY) &&
- (buffer->next_element_to_fill > 0)) {
- atomic_set(&buffer->state,
- QETH_QDIO_BUF_PRIMED);
- flush_count++;
- queue->next_buf_to_fill =
- (queue->next_buf_to_fill + 1) %
- QDIO_MAX_BUFFERS_PER_Q;
- }
+ return qeth_prep_flush_pack_buffer(queue);
}
}
- return flush_count;
-}
-
-
-/*
- * Called to flush a packing buffer if no more pci flags are on the queue.
- * Checks if there is a packing buffer and prepares it to be flushed.
- * In that case returns 1, otherwise zero.
- */
-static int qeth_flush_buffers_on_no_pci(struct qeth_qdio_out_q *queue)
-{
- struct qeth_qdio_out_buffer *buffer;
-
- buffer = queue->bufs[queue->next_buf_to_fill];
- if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) &&
- (buffer->next_element_to_fill > 0)) {
- /* it's a packing buffer */
- atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED);
- queue->next_buf_to_fill =
- (queue->next_buf_to_fill + 1) % QDIO_MAX_BUFFERS_PER_Q;
- return 1;
- }
return 0;
}
@@ -3532,8 +3518,7 @@ static void qeth_check_outbound_queue(struct qeth_qdio_out_q *queue)
flush_cnt += qeth_switch_to_nonpacking_if_needed(queue);
if (!flush_cnt &&
!atomic_read(&queue->set_pci_flags_count))
- flush_cnt +=
- qeth_flush_buffers_on_no_pci(queue);
+ flush_cnt += qeth_prep_flush_pack_buffer(queue);
if (queue->card->options.performance_stats &&
q_was_packing)
queue->card->perf_stats.bufs_sent_pack +=
@@ -4127,7 +4112,7 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
* flag out on the queue
*/
if (!flush_count && !atomic_read(&queue->set_pci_flags_count))
- flush_count += qeth_flush_buffers_on_no_pci(queue);
+ flush_count += qeth_prep_flush_pack_buffer(queue);
if (flush_count)
qeth_flush_buffers(queue, start_index, flush_count);
}