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s390/qeth: add BQL support for IQD devices

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Each TX buffer may contain multiple skbs. So just accumulate the sent
byte count in the buffer struct, and later use the same count when
completing the buffer.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-08-23 11:48:52 +02:00 committed by David S. Miller
parent 85e537d8f1
commit 96bd6c94bd
2 changed files with 16 additions and 1 deletions
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1
drivers/s390/net/qeth_core.h
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@ -426,6 +426,7 @@ struct qeth_qdio_out_buffer {
struct qdio_buffer *buffer;
atomic_t state;
int next_element_to_fill;
unsigned int bytes;
struct sk_buff_head skb_list;
int is_header[QDIO_MAX_ELEMENTS_PER_BUFFER];

16
drivers/s390/net/qeth_core_main.c
View File

@ -1142,6 +1142,7 @@ static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
qeth_scrub_qdio_buffer(buf->buffer, queue->max_elements);
buf->next_element_to_fill = 0;
buf->bytes = 0;
atomic_set(&buf->state, QETH_QDIO_BUF_EMPTY);
}
@ -2673,6 +2674,7 @@ int qeth_init_qdio_queues(struct qeth_card *card)
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;
}
@ -3790,6 +3792,7 @@ static int qeth_do_send_packet_fast(struct qeth_qdio_out_q *queue,
{
int index = queue->next_buf_to_fill;
struct qeth_qdio_out_buffer *buffer = queue->bufs[index];
unsigned int bytes = qdisc_pkt_len(skb);
struct netdev_queue *txq;
bool stopped = false;
@ -3811,6 +3814,9 @@ static int qeth_do_send_packet_fast(struct qeth_qdio_out_q *queue,
}
qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len, stopped);
netdev_tx_sent_queue(txq, bytes);
buffer->bytes += bytes;
qeth_flush_buffers(queue, index, 1);
if (stopped && !qeth_out_queue_is_full(queue))
@ -5186,6 +5192,8 @@ static int qeth_tx_poll(struct napi_struct *napi, int budget)
while (1) {
unsigned int start, error, i;
unsigned int packets = 0;
unsigned int bytes = 0;
int completed;
if (qeth_out_queue_is_empty(queue)) {
@ -5211,13 +5219,19 @@ static int qeth_tx_poll(struct napi_struct *napi, int budget)
}
for (i = start; i < start + completed; i++) {
struct qeth_qdio_out_buffer *buffer;
unsigned int bidx = QDIO_BUFNR(i);
qeth_handle_send_error(card, queue->bufs[bidx], error);
buffer = queue->bufs[bidx];
packets += skb_queue_len(&buffer->skb_list);
bytes += buffer->bytes;
qeth_handle_send_error(card, buffer, error);
qeth_iqd_tx_complete(queue, bidx, error, budget);
qeth_cleanup_handled_pending(queue, bidx, false);
}
netdev_tx_completed_queue(txq, packets, bytes);
atomic_sub(completed, &queue->used_buffers);
work_done += completed;