From patchwork Sun Jul 11 05:00:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tonghao Zhang X-Patchwork-Id: 473391 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 D5C17C07E9B for ; Sun, 11 Jul 2021 05:00:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B95716128C for ; Sun, 11 Jul 2021 05:00:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229801AbhGKFDF (ORCPT ); Sun, 11 Jul 2021 01:03:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229485AbhGKFDE (ORCPT ); Sun, 11 Jul 2021 01:03:04 -0400 Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F1DAC0613DD for ; Sat, 10 Jul 2021 22:00:17 -0700 (PDT) Received: by mail-pg1-x530.google.com with SMTP id y17so14482142pgf.12 for ; Sat, 10 Jul 2021 22:00:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=PL2ex365BMFyW6fegRkrYN1g3SJvnpB5LLT+JuMQvCE=; b=Kv0rUKwK0xgWgitPZ3znLrZreyRtX2pVQFtuEab+HaRvEEwdFnLRTRIoqCTJk0yfFZ X+4x0ObwZbhz6/k6TG2C+l/WTuCaul3nI2wBjJGQfh8n3TEo+RmC4l8hcOUCG+49bjr1 NPf1pxhy92G0CIQNpXjTsNhCkRgv39Q4Li8hw4vn8SZBpiqb0VM99G2T0SFLK8CaLAod pecT3R2/+KtqIqy1pL5O80dNPilUHe95L3VhKRaq+X5EhR3zRMfzjl3hI3u0N2Lw+45d XvZsLAkDsHXdBNPBoLZuFI8rJ+W3CQSen2V0HIpaBR5x2gV3sj3v2vv/YH6d8uP3DIc/ l9GA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=PL2ex365BMFyW6fegRkrYN1g3SJvnpB5LLT+JuMQvCE=; b=PfQt0xePjjhrwEWcA6TTSK2u7zat2L4HEpe4xIPtdtNn8DjyHbWobk+2O9nvb6QUGt vlfpsWNHNOLhrfRjI7R8iR8tLxg1ycEzMGh3a1m1WObuYRxMFgLYrK2aspYekJxiiw73 qvViQU8wah13onY4s1AebMeMY6HOHN/Htqtmbvwr6JZDtjIVFXz+alfRRCctvqzhc1oR UbrvvK7HMwzbXcACU5wrytHcA8wy1mbznad4vC46WPwI/7Bf2+milzwV/wNzApcMTEcZ +k4nEcAXs5iXpWuPSuqTp9S6ukkLABxS60v+kFzy77J81T3iu8BX0mqNOHFy3FBqrd1H X9Zw== X-Gm-Message-State: AOAM532963r20nN584dOMdgNh6BaSsxV6efsNW7iHkHR04ZXj+CGfAgJ siWk2YJlSqPDCGHSgdmKnnQ= X-Google-Smtp-Source: ABdhPJxSsuM+DUqln7Rx2HE8rZf6PGNRmMo5tl0lglCQrLIYV8hsiyuxdyVLt/FPumnzQece4TcKhw== X-Received: by 2002:a05:6a00:b42:b029:31c:abd1:53ec with SMTP id p2-20020a056a000b42b029031cabd153ecmr39702662pfo.45.1625979616663; Sat, 10 Jul 2021 22:00:16 -0700 (PDT) Received: from localhost.localdomain ([111.204.182.99]) by smtp.gmail.com with ESMTPSA id u37sm11147448pfg.140.2021.07.10.22.00.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 10 Jul 2021 22:00:16 -0700 (PDT) From: xiangxia.m.yue@gmail.com To: xiyou.wangcong@gmail.com, jhs@mojatatu.com Cc: netdev@vger.kernel.org, Tonghao Zhang Subject: [net-next 2/2] qdisc: add tracepoint qdisc:qdisc_requeue for requeued SKBs Date: Sun, 11 Jul 2021 13:00:07 +0800 Message-Id: <20210711050007.1200-2-xiangxia.m.yue@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20210711050007.1200-1-xiangxia.m.yue@gmail.com> References: <20210711050007.1200-1-xiangxia.m.yue@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Tonghao Zhang The main purpose of this tracepoint is to monitor what, how many and why packets were requeued. The txq_state can be used for determining the reason for packets requeued. Signed-off-by: Tonghao Zhang --- include/trace/events/qdisc.h | 32 ++++++++++++++++++++++++++++++++ net/sched/sch_generic.c | 8 +++++--- 2 files changed, 37 insertions(+), 3 deletions(-) diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h index b0e76237bb74..c6187a8fc103 100644 --- a/include/trace/events/qdisc.h +++ b/include/trace/events/qdisc.h @@ -78,6 +78,38 @@ TRACE_EVENT(qdisc_dequeue, __entry->txq_state, __entry->packets, __entry->skbaddr ) ); +TRACE_EVENT(qdisc_requeue, + + TP_PROTO(struct sk_buff *skb, struct Qdisc *qdisc, + const struct netdev_queue *txq), + + TP_ARGS(skb, qdisc, txq), + + TP_STRUCT__entry( + __field( struct Qdisc *, qdisc ) + __field(const struct netdev_queue *, txq ) + __field( void *, skbaddr ) + __field( int, ifindex ) + __field( u32, handle ) + __field( u32, parent ) + __field( unsigned long, txq_state) + ), + + TP_fast_assign( + __entry->qdisc = qdisc; + __entry->txq = txq; + __entry->skbaddr = skb; + __entry->ifindex = txq->dev ? txq->dev->ifindex : 0; + __entry->handle = qdisc->handle; + __entry->parent = qdisc->parent; + __entry->txq_state = txq->state; + ), + + TP_printk("requeue ifindex=%d qdisc handle=0x%X parent=0x%X txq_state=0x%lX skbaddr=%p", + __entry->ifindex, __entry->handle, __entry->parent, + __entry->txq_state, __entry->skbaddr) +); + TRACE_EVENT(qdisc_reset, TP_PROTO(struct Qdisc *q), diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 75605075178f..0701d1e9d221 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -137,7 +137,8 @@ static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, spin_unlock(lock); } -static inline void dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) +static inline void dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q, + struct netdev_queue *txq) { spinlock_t *lock = NULL; @@ -149,6 +150,7 @@ static inline void dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) while (skb) { struct sk_buff *next = skb->next; + trace_qdisc_requeue(skb, q, txq); __skb_queue_tail(&q->gso_skb, skb); /* it's still part of the queue */ @@ -325,7 +327,7 @@ bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, if (root_lock) spin_lock(root_lock); - dev_requeue_skb(skb, q); + dev_requeue_skb(skb, q, txq); return false; } #endif @@ -353,7 +355,7 @@ bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, net_warn_ratelimited("BUG %s code %d qlen %d\n", dev->name, ret, q->q.qlen); - dev_requeue_skb(skb, q); + dev_requeue_skb(skb, q, txq); return false; }