From patchwork Fri Dec 9 16:16:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steffen Maier X-Patchwork-Id: 9468543 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7FA0B607D8 for ; Fri, 9 Dec 2016 16:17:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F1F828650 for ; Fri, 9 Dec 2016 16:17:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 61E8028653; Fri, 9 Dec 2016 16:17:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C574228650 for ; Fri, 9 Dec 2016 16:17:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933337AbcLIQR4 (ORCPT ); Fri, 9 Dec 2016 11:17:56 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:49785 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933546AbcLIQRz (ORCPT ); Fri, 9 Dec 2016 11:17:55 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uB9GF34p111613 for ; Fri, 9 Dec 2016 11:17:54 -0500 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0b-001b2d01.pphosted.com with ESMTP id 277ymhhf2a-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 09 Dec 2016 11:17:54 -0500 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Petersen" Cc: linux-scsi@vger.kernel.org, linux-s390@vger.kernel.org, Martin Schwidefsky , Heiko Carstens , Steffen Maier , "#2 . 6 . 37+" Subject: [PATCH 2/3] zfcp: do not trace pure benign residual HBA responses at default level Date: Fri, 9 Dec 2016 17:16:32 +0100 X-Mailer: git-send-email 2.8.4 In-Reply-To: <20161209161633.72445-1-maier@linux.vnet.ibm.com> References: <20161209161633.72445-1-maier@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16120916-0020-0000-0000-00000290EC39 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16120916-0021-0000-0000-00003F5B2FCE Message-Id: <20161209161633.72445-3-maier@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-12-09_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1612090227 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since quite a while, Linux issues enough SCSI commands per scsi_device which successfully return with FCP_RESID_UNDER, FSF_FCP_RSP_AVAILABLE, and SAM_STAT_GOOD. This floods the HBA trace area and we cannot see other and important HBA trace records long enough. Therefore, do not trace HBA response errors for pure benign residual under counts at the default trace level. This excludes benign residual under count combined with other validity bits set in FCP_RSP_IU, such as FCP_SNS_LEN_VAL. For all those other cases, we still do want to see both the HBA record and the corresponding SCSI record by default. Signed-off-by: Steffen Maier Fixes: a54ca0f62f95 ("[SCSI] zfcp: Redesign of the debug tracing for HBA records.") Cc: #2.6.37+ Reviewed-by: Benjamin Block --- drivers/s390/scsi/zfcp_dbf.h | 30 ++++++++++++++++++++++++++++-- drivers/s390/scsi/zfcp_fsf.h | 3 ++- 2 files changed, 30 insertions(+), 3 deletions(-) diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h index 2d06b5d2c05b..db186d44cfaf 100644 --- a/drivers/s390/scsi/zfcp_dbf.h +++ b/drivers/s390/scsi/zfcp_dbf.h @@ -2,7 +2,7 @@ * zfcp device driver * debug feature declarations * - * Copyright IBM Corp. 2008, 2015 + * Copyright IBM Corp. 2008, 2016 */ #ifndef ZFCP_DBF_H @@ -283,6 +283,30 @@ struct zfcp_dbf { struct zfcp_dbf_scsi scsi_buf; }; +/** + * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default + * @req: request that has been completed + * + * Returns true if FCP response with only benign residual under count. + */ +static inline +bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req) +{ + struct fsf_qtcb *qtcb = req->qtcb; + u32 fsf_stat = qtcb->header.fsf_status; + struct fcp_resp *fcp_rsp; + u8 rsp_flags, fr_status; + + if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND) + return false; /* not an FCP response */ + fcp_rsp = (struct fcp_resp *)&qtcb->bottom.io.fcp_rsp; + rsp_flags = fcp_rsp->fr_flags; + fr_status = fcp_rsp->fr_status; + return (fsf_stat == FSF_FCP_RSP_AVAILABLE) && + (rsp_flags == FCP_RESID_UNDER) && + (fr_status == SAM_STAT_GOOD); +} + static inline void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req) { @@ -304,7 +328,9 @@ void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req) zfcp_dbf_hba_fsf_resp("fs_perr", 1, req); } else if (qtcb->header.fsf_status != FSF_GOOD) { - zfcp_dbf_hba_fsf_resp("fs_ferr", 1, req); + zfcp_dbf_hba_fsf_resp("fs_ferr", + zfcp_dbf_hba_fsf_resp_suppress(req) + ? 5 : 1, req); } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) || (req->fsf_command == FSF_QTCB_OPEN_LUN)) { diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h index be1c04b334c5..ea3c76ac0de1 100644 --- a/drivers/s390/scsi/zfcp_fsf.h +++ b/drivers/s390/scsi/zfcp_fsf.h @@ -3,7 +3,7 @@ * * Interface to the FSF support functions. * - * Copyright IBM Corp. 2002, 2015 + * Copyright IBM Corp. 2002, 2016 */ #ifndef FSF_H @@ -78,6 +78,7 @@ #define FSF_APP_TAG_CHECK_FAILURE 0x00000082 #define FSF_REF_TAG_CHECK_FAILURE 0x00000083 #define FSF_ADAPTER_STATUS_AVAILABLE 0x000000AD +#define FSF_FCP_RSP_AVAILABLE 0x000000AF #define FSF_UNKNOWN_COMMAND 0x000000E2 #define FSF_UNKNOWN_OP_SUBTYPE 0x000000E3 #define FSF_INVALID_COMMAND_OPTION 0x000000E5