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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>
This commit is contained in:
Julian Wiedmann 2017-06-06 14:33:47 +02:00 committed by David S. Miller
parent 84616e86f8
commit 664e42ac8b
1 changed files with 25 additions and 40 deletions
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65
drivers/s390/net/qeth_core_main.c
View File

@ -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);
}