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-rw-r--r--drivers/s390/net/qeth_core.h8
-rw-r--r--drivers/s390/net/qeth_core_main.c80
2 files changed, 23 insertions, 65 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index ecfd6d152e86..00ed58428163 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -420,12 +420,6 @@ struct qeth_qdio_out_buffer {
struct qeth_card;
-enum qeth_out_q_states {
- QETH_OUT_Q_UNLOCKED,
- QETH_OUT_Q_LOCKED,
- QETH_OUT_Q_LOCKED_FLUSH,
-};
-
#define QETH_CARD_STAT_ADD(_c, _stat, _val) ((_c)->stats._stat += (_val))
#define QETH_CARD_STAT_INC(_c, _stat) QETH_CARD_STAT_ADD(_c, _stat, 1)
@@ -486,12 +480,12 @@ struct qeth_qdio_out_q {
struct qeth_qdio_out_buffer *bufs[QDIO_MAX_BUFFERS_PER_Q];
struct qdio_outbuf_state *bufstates; /* convenience pointer */
struct qeth_out_q_stats stats;
+ spinlock_t lock;
u8 next_buf_to_fill;
u8 max_elements;
u8 queue_no;
u8 do_pack;
struct qeth_card *card;
- atomic_t state;
/*
* number of buffers that are currently filled (PRIMED)
* -> these buffers are hardware-owned
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 5742a682a193..26bc8c15ffb8 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2702,6 +2702,7 @@ static int qeth_alloc_qdio_queues(struct qeth_card *card)
card->qdio.out_qs[i] = queue;
queue->card = card;
queue->queue_no = i;
+ spin_lock_init(&queue->lock);
timer_setup(&queue->timer, qeth_tx_completion_timer, 0);
queue->coalesce_usecs = QETH_TX_COALESCE_USECS;
queue->max_coalesced_frames = QETH_TX_MAX_COALESCED_FRAMES;
@@ -3068,7 +3069,6 @@ static int qeth_init_qdio_queues(struct qeth_card *card)
queue->bulk_max = qeth_tx_select_bulk_max(card, queue);
atomic_set(&queue->used_buffers, 0);
atomic_set(&queue->set_pci_flags_count, 0);
- atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
netdev_tx_reset_queue(netdev_get_tx_queue(card->dev, i));
}
return 0;
@@ -3741,37 +3741,31 @@ static void qeth_flush_queue(struct qeth_qdio_out_q *queue)
static void qeth_check_outbound_queue(struct qeth_qdio_out_q *queue)
{
- int index;
- int flush_cnt = 0;
- int q_was_packing = 0;
-
/*
* check if weed have to switch to non-packing mode or if
* we have to get a pci flag out on the queue
*/
if ((atomic_read(&queue->used_buffers) <= QETH_LOW_WATERMARK_PACK) ||
!atomic_read(&queue->set_pci_flags_count)) {
- if (atomic_xchg(&queue->state, QETH_OUT_Q_LOCKED_FLUSH) ==
- QETH_OUT_Q_UNLOCKED) {
- /*
- * If we get in here, there was no action in
- * do_send_packet. So, we check if there is a
- * packing buffer to be flushed here.
- */
- index = queue->next_buf_to_fill;
- q_was_packing = queue->do_pack;
- /* queue->do_pack may change */
- barrier();
- flush_cnt += qeth_switch_to_nonpacking_if_needed(queue);
- if (!flush_cnt &&
- !atomic_read(&queue->set_pci_flags_count))
- flush_cnt += qeth_prep_flush_pack_buffer(queue);
+ unsigned int index, flush_cnt;
+ bool q_was_packing;
+
+ spin_lock(&queue->lock);
+
+ index = queue->next_buf_to_fill;
+ q_was_packing = queue->do_pack;
+
+ flush_cnt = qeth_switch_to_nonpacking_if_needed(queue);
+ if (!flush_cnt && !atomic_read(&queue->set_pci_flags_count))
+ flush_cnt = qeth_prep_flush_pack_buffer(queue);
+
+ if (flush_cnt) {
+ qeth_flush_buffers(queue, index, flush_cnt);
if (q_was_packing)
QETH_TXQ_STAT_ADD(queue, bufs_pack, flush_cnt);
- if (flush_cnt)
- qeth_flush_buffers(queue, index, flush_cnt);
- atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
}
+
+ spin_unlock(&queue->lock);
}
}
@@ -4283,29 +4277,22 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
unsigned int offset, unsigned int hd_len,
int elements_needed)
{
+ unsigned int start_index = queue->next_buf_to_fill;
struct qeth_qdio_out_buffer *buffer;
unsigned int next_element;
struct netdev_queue *txq;
bool stopped = false;
- int start_index;
int flush_count = 0;
int do_pack = 0;
- int tmp;
int rc = 0;
- /* spin until we get the queue ... */
- while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
- QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
- start_index = queue->next_buf_to_fill;
buffer = queue->bufs[queue->next_buf_to_fill];
/* Just a sanity check, the wake/stop logic should ensure that we always
* get a free buffer.
*/
- if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY) {
- atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
+ if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY)
return -EBUSY;
- }
txq = netdev_get_tx_queue(card->dev, skb_get_queue_mapping(skb));
@@ -4328,8 +4315,6 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
QETH_QDIO_BUF_EMPTY) {
qeth_flush_buffers(queue, start_index,
flush_count);
- atomic_set(&queue->state,
- QETH_OUT_Q_UNLOCKED);
rc = -EBUSY;
goto out;
}
@@ -4361,31 +4346,8 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
if (flush_count)
qeth_flush_buffers(queue, start_index, flush_count);
- else if (!atomic_read(&queue->set_pci_flags_count))
- atomic_xchg(&queue->state, QETH_OUT_Q_LOCKED_FLUSH);
- /*
- * queue->state will go from LOCKED -> UNLOCKED or from
- * LOCKED_FLUSH -> LOCKED if output_handler wanted to 'notify' us
- * (switch packing state or flush buffer to get another pci flag out).
- * In that case we will enter this loop
- */
- while (atomic_dec_return(&queue->state)) {
- start_index = queue->next_buf_to_fill;
- /* check if we can go back to non-packing state */
- tmp = qeth_switch_to_nonpacking_if_needed(queue);
- /*
- * check if we need to flush a packing buffer to get a pci
- * flag out on the queue
- */
- if (!tmp && !atomic_read(&queue->set_pci_flags_count))
- tmp = qeth_prep_flush_pack_buffer(queue);
- if (tmp) {
- qeth_flush_buffers(queue, start_index, tmp);
- flush_count += tmp;
- }
- }
+
out:
- /* at this point the queue is UNLOCKED again */
if (do_pack)
QETH_TXQ_STAT_ADD(queue, bufs_pack, flush_count);
@@ -4459,8 +4421,10 @@ int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
} else {
/* TODO: drop skb_orphan() once TX completion is fast enough */
skb_orphan(skb);
+ spin_lock(&queue->lock);
rc = qeth_do_send_packet(card, queue, skb, hdr, data_offset,
hd_len, elements);
+ spin_unlock(&queue->lock);
}
if (rc && !push_len)
generated by cgit (git 2.34.1) at 2024-05-29 17:33:58 +0000