netdev - [PATCH net-next 1/9] s390/qeth: count TX completion interrupts

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Date:   Fri, 11 Jun 2021 09:33:33 +0200
From:   Julian Wiedmann <jwi@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-netdev <netdev@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next 1/9] s390/qeth: count TX completion interrupts

While the qdio layer already tracks the number of HW interrupts for a
device, there's value in understanding how many of them have been
raised due to our TX completion logic.

Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
---
 drivers/s390/net/qeth_core.h      | 1 +
 drivers/s390/net/qeth_core_main.c | 4 +++-
 drivers/s390/net/qeth_ethtool.c   | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index fd9b869d278e..3a49ef8dd906 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -483,6 +483,7 @@ struct qeth_out_q_stats {
 	u64 stopped;
 	u64 doorbell;
 	u64 coal_frames;
+	u64 completion_irq;
 	u64 completion_yield;
 	u64 completion_timer;
 
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index a1f08e9aa064..9085f22ca34c 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1400,8 +1400,10 @@ static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
 	int i;
 
 	/* is PCI flag set on buffer? */
-	if (buf->buffer->element[0].sflags & SBAL_SFLAGS0_PCI_REQ)
+	if (buf->buffer->element[0].sflags & SBAL_SFLAGS0_PCI_REQ) {
 		atomic_dec(&queue->set_pci_flags_count);
+		QETH_TXQ_STAT_INC(queue, completion_irq);
+	}
 
 	qeth_tx_complete_buf(buf, error, budget);
 
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index 3a51bbff0ffe..190dac2065df 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -41,6 +41,7 @@ static const struct qeth_stats txq_stats[] = {
 	QETH_TXQ_STAT("Queue stopped", stopped),
 	QETH_TXQ_STAT("Doorbell", doorbell),
 	QETH_TXQ_STAT("IRQ for frames", coal_frames),
+	QETH_TXQ_STAT("Completion IRQ", completion_irq),
 	QETH_TXQ_STAT("Completion yield", completion_yield),
 	QETH_TXQ_STAT("Completion timer", completion_timer),
 };
-- 
2.25.1