From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 936ECC43219 for ; Fri, 26 Apr 2019 18:51:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6792F20B7C for ; Fri, 26 Apr 2019 18:51:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="Z/UPKfti" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726703AbfDZSvR (ORCPT ); Fri, 26 Apr 2019 14:51:17 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:41146 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726341AbfDZSvO (ORCPT ); Fri, 26 Apr 2019 14:51:14 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3QInV9s004908; Fri, 26 Apr 2019 11:50:14 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=U9btbdN6iOLmTBHesjvAEFIqWr3Fke2ki4D7RR67zXM=; b=Z/UPKftiJ8XiofxlO5x2DsI+p3g5we+YSCz7paHOVeel1DOhQskVGA8X9hQrkFWSdjFn 0iIHZ5ythrjkhjXx0CRDbGhK+DJyS78GCVHnK2uxvHHto5/haleZ1RvlS+5zO7MNaB0B feT+mLyBSv7PZsies/XLIgy1PzbCW1oUYMg= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2s447r0s22-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Fri, 26 Apr 2019 11:50:14 -0700 Received: from mmullins-1.thefacebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::125) with Microsoft SMTP Server id 15.1.1713.5; Fri, 26 Apr 2019 11:50:12 -0700 From: Matt Mullins To: , , , , CC: , Josef Bacik , "Jens Axboe" , Steven Rostedt , Ingo Molnar , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , "David S. Miller" , Mauro Carvalho Chehab , Greg Kroah-Hartman , Nicolas Ferre , , Subject: [PATCH bpf-next v5 2/5] nbd: trace sending nbd requests Date: Fri, 26 Apr 2019 11:49:48 -0700 Message-ID: <20190426184951.21812-3-mmullins@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190426184951.21812-1-mmullins@fb.com> References: <20190426184951.21812-1-mmullins@fb.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [2620:10d:c081:10::13] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-26_12:,, signatures=0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds a tracepoint that can both observe the nbd request being sent to the server, as well as modify that request , e.g., setting a flag in the request that will cause the server to collect detailed tracing data. The struct request * being handled is included to permit correlation with the block tracepoints. Signed-off-by: Matt Mullins Reviewed-by: Josef Bacik --- MAINTAINERS | 1 + drivers/block/nbd.c | 5 ++++ include/trace/events/nbd.h | 56 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+) create mode 100644 include/trace/events/nbd.h diff --git a/MAINTAINERS b/MAINTAINERS index 72dfb80e8721..025c6d27789e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10741,6 +10741,7 @@ L: linux-block@vger.kernel.org L: nbd@other.debian.org F: Documentation/blockdev/nbd.txt F: drivers/block/nbd.c +F: include/trace/events/nbd.h F: include/uapi/linux/nbd.h NETWORK DROP MONITOR diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 92b8aafb8bb4..24cc10d1f0b4 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -44,6 +44,9 @@ #include #include +#define CREATE_TRACE_POINTS +#include + static DEFINE_IDR(nbd_index_idr); static DEFINE_MUTEX(nbd_index_mutex); static int nbd_total_devices = 0; @@ -526,6 +529,8 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) handle = nbd_cmd_handle(cmd); memcpy(request.handle, &handle, sizeof(handle)); + trace_nbd_send_request(&request, nbd->index, blk_mq_rq_from_pdu(cmd)); + dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", req, nbdcmd_to_ascii(type), (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); diff --git a/include/trace/events/nbd.h b/include/trace/events/nbd.h new file mode 100644 index 000000000000..5928255ed02e --- /dev/null +++ b/include/trace/events/nbd.h @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM nbd + +#if !defined(_TRACE_NBD_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_NBD_H + +#include + +DECLARE_EVENT_CLASS(nbd_send_request, + + TP_PROTO(struct nbd_request *nbd_request, int index, + struct request *rq), + + TP_ARGS(nbd_request, index, rq), + + TP_STRUCT__entry( + __field(struct nbd_request *, nbd_request) + __field(u64, dev_index) + __field(struct request *, request) + ), + + TP_fast_assign( + __entry->nbd_request = 0; + __entry->dev_index = index; + __entry->request = rq; + ), + + TP_printk("nbd%lld: request %p", __entry->dev_index, __entry->request) +); + +#ifdef DEFINE_EVENT_WRITABLE +#undef NBD_DEFINE_EVENT +#define NBD_DEFINE_EVENT(template, call, proto, args, size) \ + DEFINE_EVENT_WRITABLE(template, call, PARAMS(proto), \ + PARAMS(args), size) +#else +#undef NBD_DEFINE_EVENT +#define NBD_DEFINE_EVENT(template, call, proto, args, size) \ + DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args)) +#endif + +NBD_DEFINE_EVENT(nbd_send_request, nbd_send_request, + + TP_PROTO(struct nbd_request *nbd_request, int index, + struct request *rq), + + TP_ARGS(nbd_request, index, rq), + + sizeof(struct nbd_request) +); + +#endif + +/* This part must be outside protection */ +#include -- 2.17.1