From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julian Wiedmann Subject: [PATCH net-next 2/4] s390/qeth: fix packing buffer statistics Date: Tue, 20 Jun 2017 16:00:32 +0200 Message-ID: <20170620140034.89661-3-jwi@linux.vnet.ibm.com> References: <20170620140034.89661-1-jwi@linux.vnet.ibm.com> Cc: , , Martin Schwidefsky , Heiko Carstens , Stefan Raspl , Ursula Braun , Julian Wiedmann To: David Miller Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:38630 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752006AbdFTOAo (ORCPT ); Tue, 20 Jun 2017 10:00:44 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v5KDwp9A091770 for ; Tue, 20 Jun 2017 10:00:43 -0400 Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) by mx0b-001b2d01.pphosted.com with ESMTP id 2b70ybce7f-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 20 Jun 2017 10:00:43 -0400 Received: from localhost by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 20 Jun 2017 15:00:41 +0100 In-Reply-To: <20170620140034.89661-1-jwi@linux.vnet.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: There's two spots in qeth_send_packet() where we don't accurately account for transmitted packing buffers in qeth's performance statistics: 1) when flushing the current buffer due to insufficient size, and the next buffer is not EMPTY, we need to account for that flushed buffer. 2) when synchronizing with the TX completion code, we reset flush_count and thus forget to account for any previously flushed buffers. Reported-by: Nils Hoppmann Signed-off-by: Julian Wiedmann --- drivers/s390/net/qeth_core_main.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 08338f27c82c..13a55f1dee7a 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -4103,7 +4103,8 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue, flush_count); atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED); - return -EBUSY; + rc = -EBUSY; + goto out; } } } @@ -4122,19 +4123,21 @@ int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue, * In that case we will enter this loop */ while (atomic_dec_return(&queue->state)) { - flush_count = 0; start_index = queue->next_buf_to_fill; /* check if we can go back to non-packing state */ - flush_count += qeth_switch_to_nonpacking_if_needed(queue); + 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 (!flush_count && !atomic_read(&queue->set_pci_flags_count)) - flush_count += qeth_prep_flush_pack_buffer(queue); - if (flush_count) - qeth_flush_buffers(queue, start_index, flush_count); + 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 (queue->card->options.performance_stats && do_pack) queue->card->perf_stats.bufs_sent_pack += flush_count; -- 2.11.2