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s390/qeth: collect more TX statistics

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Count the number of TX doorbells we issue to the qdio layer.

Also count the number of actual frames in a TX buffer, and then
use this data along with the byte count during TX completion.
We'll make additional use of the frame count in a subsequent patch.

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 2020-03-25 10:35:03 +01:00 committed by David S. Miller
parent 9de15117f1
commit 1ab2f8c699
3 changed files with 17 additions and 6 deletions
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2
drivers/s390/net/qeth_core.h
View file

@ -402,6 +402,7 @@ struct qeth_qdio_out_buffer {
struct qdio_buffer *buffer;
atomic_t state;
int next_element_to_fill;
unsigned int frames;
unsigned int bytes;
struct sk_buff_head skb_list;
int is_header[QDIO_MAX_ELEMENTS_PER_BUFFER];
@ -457,6 +458,7 @@ struct qeth_out_q_stats {
u64 tso_bytes;
u64 packing_mode_switch;
u64 stopped;
u64 doorbell;
u64 completion_yield;
u64 completion_timer;

20
drivers/s390/net/qeth_core_main.c
View file

@ -1155,17 +1155,20 @@ static void qeth_tx_complete_buf(struct qeth_qdio_out_buffer *buf, bool error,
QETH_TXQ_STAT_INC(queue, bufs);
QETH_TXQ_STAT_ADD(queue, buf_elements, buf->next_element_to_fill);
if (error) {
QETH_TXQ_STAT_ADD(queue, tx_errors, buf->frames);
} else {
QETH_TXQ_STAT_ADD(queue, tx_packets, buf->frames);
QETH_TXQ_STAT_ADD(queue, tx_bytes, buf->bytes);
}
while ((skb = __skb_dequeue(&buf->skb_list)) != NULL) {
unsigned int bytes = qdisc_pkt_len(skb);
bool is_tso = skb_is_gso(skb);
unsigned int packets;
packets = is_tso ? skb_shinfo(skb)->gso_segs : 1;
if (error) {
QETH_TXQ_STAT_ADD(queue, tx_errors, packets);
} else {
QETH_TXQ_STAT_ADD(queue, tx_packets, packets);
QETH_TXQ_STAT_ADD(queue, tx_bytes, bytes);
if (!error) {
if (skb->ip_summed == CHECKSUM_PARTIAL)
QETH_TXQ_STAT_ADD(queue, skbs_csum, packets);
if (skb_is_nonlinear(skb))
@ -1202,6 +1205,7 @@ 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->frames = 0;
buf->bytes = 0;
atomic_set(&buf->state, QETH_QDIO_BUF_EMPTY);
}
@ -3389,6 +3393,7 @@ static void qeth_flush_buffers(struct qeth_qdio_out_q *queue, int index,
}
}
QETH_TXQ_STAT_INC(queue, doorbell);
qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
if (atomic_read(&queue->set_pci_flags_count))
qdio_flags |= QDIO_FLAG_PCI_OUT;
@ -3942,6 +3947,7 @@ static int __qeth_xmit(struct qeth_card *card, struct qeth_qdio_out_q *queue,
next_element = qeth_fill_buffer(buffer, skb, hdr, offset, hd_len);
buffer->bytes += bytes;
buffer->frames += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
queue->prev_hdr = hdr;
flush = __netdev_tx_sent_queue(txq, bytes,
@ -4032,6 +4038,8 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue,
}
next_element = qeth_fill_buffer(buffer, skb, hdr, offset, hd_len);
buffer->bytes += qdisc_pkt_len(skb);
buffer->frames += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
if (queue->do_pack)
QETH_TXQ_STAT_INC(queue, skbs_pack);
@ -5668,7 +5676,7 @@ static int qeth_tx_poll(struct napi_struct *napi, int budget)
unsigned int bidx = QDIO_BUFNR(i);
buffer = queue->bufs[bidx];
packets += skb_queue_len(&buffer->skb_list);
packets += buffer->frames;
bytes += buffer->bytes;
qeth_handle_send_error(card, buffer, error);

1
drivers/s390/net/qeth_ethtool.c
View file

@ -39,6 +39,7 @@ static const struct qeth_stats txq_stats[] = {
QETH_TXQ_STAT("TSO bytes", tso_bytes),
QETH_TXQ_STAT("Packing mode switches", packing_mode_switch),
QETH_TXQ_STAT("Queue stopped", stopped),
QETH_TXQ_STAT("Doorbell", doorbell),
QETH_TXQ_STAT("Completion yield", completion_yield),
QETH_TXQ_STAT("Completion timer", completion_timer),
};