From patchwork Mon Nov 1 07:39:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lu X-Patchwork-Id: 12595983 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 181E9C433F5 for ; Mon, 1 Nov 2021 07:40:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE86D60EBB for ; Mon, 1 Nov 2021 07:40:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231191AbhKAHnT (ORCPT ); Mon, 1 Nov 2021 03:43:19 -0400 Received: from out30-133.freemail.mail.aliyun.com ([115.124.30.133]:59393 "EHLO out30-133.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229933AbhKAHnQ (ORCPT ); Mon, 1 Nov 2021 03:43:16 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R361e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=tonylu@linux.alibaba.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---0UuWIaRW_1635752440; Received: from localhost(mailfrom:tonylu@linux.alibaba.com fp:SMTPD_---0UuWIaRW_1635752440) by smtp.aliyun-inc.com(127.0.0.1); Mon, 01 Nov 2021 15:40:41 +0800 From: Tony Lu To: kgraul@linux.ibm.com Cc: kuba@kernel.org, davem@davemloft.net, guwen@linux.alibaba.com, dust.li@linux.alibaba.com, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH net-next 1/3] net/smc: Introduce tracepoint for fallback Date: Mon, 1 Nov 2021 15:39:12 +0800 Message-Id: <20211101073912.60410-2-tonylu@linux.alibaba.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211101073912.60410-1-tonylu@linux.alibaba.com> References: <20211101073912.60410-1-tonylu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org This introduces tracepoint for smc fallback to TCP, so that we can track which connection and why it fallbacks, and map the clcsocks' pointer with /proc/net/tcp to find more details about TCP connections. Compared with kprobe or other dynamic tracing, tracepoints are stable and easy to use. Signed-off-by: Tony Lu Reviewed-by: Wen Gu --- net/smc/Makefile | 2 ++ net/smc/af_smc.c | 2 ++ net/smc/smc_tracepoint.c | 6 +++++ net/smc/smc_tracepoint.h | 49 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 59 insertions(+) create mode 100644 net/smc/smc_tracepoint.c create mode 100644 net/smc/smc_tracepoint.h diff --git a/net/smc/Makefile b/net/smc/Makefile index 99a0186cba5b..196fb6f01b14 100644 --- a/net/smc/Makefile +++ b/net/smc/Makefile @@ -1,5 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only +ccflags-y += -I$(src) obj-$(CONFIG_SMC) += smc.o obj-$(CONFIG_SMC_DIAG) += smc_diag.o smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o +smc-y += smc_tracepoint.o diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 8dc34388b2c1..0cf7ed2f5d41 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -50,6 +50,7 @@ #include "smc_rx.h" #include "smc_close.h" #include "smc_stats.h" +#include "smc_tracepoint.h" static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group * creation on server @@ -564,6 +565,7 @@ static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code) smc->use_fallback = true; smc->fallback_rsn = reason_code; smc_stat_fallback(smc); + trace_smc_switch_to_fallback(smc, reason_code); if (smc->sk.sk_socket && smc->sk.sk_socket->file) { smc->clcsock->file = smc->sk.sk_socket->file; smc->clcsock->file->private_data = smc->clcsock; diff --git a/net/smc/smc_tracepoint.c b/net/smc/smc_tracepoint.c new file mode 100644 index 000000000000..861a41644971 --- /dev/null +++ b/net/smc/smc_tracepoint.c @@ -0,0 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#define CREATE_TRACE_POINTS +#include "smc_tracepoint.h" + +EXPORT_TRACEPOINT_SYMBOL(smc_switch_to_fallback); diff --git a/net/smc/smc_tracepoint.h b/net/smc/smc_tracepoint.h new file mode 100644 index 000000000000..3bc97f5f2134 --- /dev/null +++ b/net/smc/smc_tracepoint.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM smc + +#if !defined(_TRACE_SMC_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_SMC_H + +#include +#include +#include +#include +#include "smc.h" +#include "smc_core.h" + +TRACE_EVENT(smc_switch_to_fallback, + + TP_PROTO(const struct smc_sock *smc, int fallback_rsn), + + TP_ARGS(smc, fallback_rsn), + + TP_STRUCT__entry( + __field(const void *, sk) + __field(const void *, clcsk) + __field(int, fallback_rsn) + ), + + TP_fast_assign( + const struct sock *sk = &smc->sk; + const struct sock *clcsk = smc->clcsock->sk; + + __entry->sk = sk; + __entry->clcsk = clcsk; + __entry->fallback_rsn = fallback_rsn; + ), + + TP_printk("sk=%p clcsk=%p fallback_rsn=%d", + __entry->sk, __entry->clcsk, __entry->fallback_rsn) +); + +#endif /* _TRACE_SMC_H */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . + +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE smc_tracepoint + +#include