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s390/qeth: collect accurate TX statistics

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This consolidates the SW statistics code, and improves it to
(1) account for the header overhead of each segment on a TSO skb,
(2) count dangling packets as in-error (during eg. shutdown), and
(3) only count offloads when the skb was successfully transmitted.

We also count each segment of an TSO skb as one packet - except for
tx_dropped, to be consistent with dev->tx_dropped.

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 11:48:49 +02:00
committed by David S. Miller
parent 313dc689b1
commit eeac0e20a1
4 changed files with 49 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
drivers/s390/net/qeth_core_main.c
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@@ -71,7 +71,7 @@ static void qeth_free_qdio_queues(struct qeth_card *card);
static void qeth_notify_skbs(struct qeth_qdio_out_q *queue,
struct qeth_qdio_out_buffer *buf,
enum iucv_tx_notify notification);
static void qeth_release_skbs(struct qeth_qdio_out_buffer *buf);
static void qeth_tx_complete_buf(struct qeth_qdio_out_buffer *buf, bool error);
static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *, int);
static void qeth_close_dev_handler(struct work_struct *work)
@@ -411,7 +411,7 @@ static void qeth_cleanup_handled_pending(struct qeth_qdio_out_q *q, int bidx,
/* release here to avoid interleaving between
outbound tasklet and inbound tasklet
regarding notifications and lifecycle */
qeth_release_skbs(c);
qeth_tx_complete_buf(c, forced_cleanup);
c = f->next_pending;
WARN_ON_ONCE(head->next_pending != f);
@@ -1077,22 +1077,51 @@ static void qeth_notify_skbs(struct qeth_qdio_out_q *q,
}
}
static void qeth_release_skbs(struct qeth_qdio_out_buffer *buf)
static void qeth_tx_complete_buf(struct qeth_qdio_out_buffer *buf, bool error)
{
struct qeth_qdio_out_q *queue = buf->q;
struct sk_buff *skb;
/* release may never happen from within CQ tasklet scope */
WARN_ON_ONCE(atomic_read(&buf->state) == QETH_QDIO_BUF_IN_CQ);
if (atomic_read(&buf->state) == QETH_QDIO_BUF_PENDING)
qeth_notify_skbs(buf->q, buf, TX_NOTIFY_GENERALERROR);
qeth_notify_skbs(queue, buf, TX_NOTIFY_GENERALERROR);
/* Empty buffer? */
if (buf->next_element_to_fill == 0)
return;
QETH_TXQ_STAT_INC(queue, bufs);
QETH_TXQ_STAT_ADD(queue, buf_elements, buf->next_element_to_fill);
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 (skb->ip_summed == CHECKSUM_PARTIAL)
QETH_TXQ_STAT_ADD(queue, skbs_csum, packets);
if (skb_is_nonlinear(skb))
QETH_TXQ_STAT_INC(queue, skbs_sg);
if (is_tso) {
QETH_TXQ_STAT_INC(queue, skbs_tso);
QETH_TXQ_STAT_ADD(queue, tso_bytes, bytes);
}
}
while ((skb = __skb_dequeue(&buf->skb_list)) != NULL)
consume_skb(skb);
}
}
static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
struct qeth_qdio_out_buffer *buf)
struct qeth_qdio_out_buffer *buf,
bool error)
{
int i;
@@ -1100,7 +1129,7 @@ static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
if (buf->buffer->element[0].sflags & SBAL_SFLAGS0_PCI_REQ)
atomic_dec(&queue->set_pci_flags_count);
qeth_release_skbs(buf);
qeth_tx_complete_buf(buf, error);
for (i = 0; i < queue->max_elements; ++i) {
if (buf->buffer->element[i].addr && buf->is_header[i])
@@ -1122,7 +1151,7 @@ static void qeth_drain_output_queue(struct qeth_qdio_out_q *q, bool free)
if (!q->bufs[j])
continue;
qeth_cleanup_handled_pending(q, j, 1);
qeth_clear_output_buffer(q, q->bufs[j]);
qeth_clear_output_buffer(q, q->bufs[j], true);
if (free) {
kmem_cache_free(qeth_qdio_outbuf_cache, q->bufs[j]);
q->bufs[j] = NULL;
@@ -3240,14 +3269,12 @@ static void qeth_flush_buffers(struct qeth_qdio_out_q *queue, int index,
}
}
QETH_TXQ_STAT_ADD(queue, bufs, count);
qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
if (atomic_read(&queue->set_pci_flags_count))
qdio_flags |= QDIO_FLAG_PCI_OUT;
rc = do_QDIO(CARD_DDEV(queue->card), qdio_flags,
queue->queue_no, index, count);
if (rc) {
QETH_TXQ_STAT_ADD(queue, tx_errors, count);
/* ignore temporary SIGA errors without busy condition */
if (rc == -ENOBUFS)
return;
@@ -3456,7 +3483,7 @@ static void qeth_qdio_output_handler(struct ccw_device *ccwdev,
qeth_notify_skbs(queue, buffer, n);
}
qeth_clear_output_buffer(queue, buffer);
qeth_clear_output_buffer(queue, buffer, qdio_error);
}
qeth_cleanup_handled_pending(queue, bidx, 0);
}
@@ -3942,7 +3969,6 @@ int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
unsigned int hd_len = 0;
unsigned int elements;
int push_len, rc;
bool is_sg;
if (is_tso) {
hw_hdr_len = sizeof(struct qeth_hdr_tso);
@@ -3971,7 +3997,6 @@ int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
qeth_fill_tso_ext((struct qeth_hdr_tso *) hdr,
frame_len - proto_len, skb, proto_len);
is_sg = skb_is_nonlinear(skb);
if (IS_IQD(card)) {
rc = qeth_do_send_packet_fast(queue, skb, hdr, data_offset,
hd_len);
@@ -3982,18 +4007,9 @@ int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
hd_len, elements);
}
if (!rc) {
QETH_TXQ_STAT_ADD(queue, buf_elements, elements);
if (is_sg)
QETH_TXQ_STAT_INC(queue, skbs_sg);
if (is_tso) {
QETH_TXQ_STAT_INC(queue, skbs_tso);
QETH_TXQ_STAT_ADD(queue, tso_bytes, frame_len);
}
} else {
if (!push_len)
kmem_cache_free(qeth_core_header_cache, hdr);
}
if (rc && !push_len)
kmem_cache_free(qeth_core_header_cache, hdr);
return rc;
}
EXPORT_SYMBOL_GPL(qeth_xmit);