From patchwork Thu Oct 6 10:50:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Bogdanov X-Patchwork-Id: 13000118 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B22ABC433FE for ; Thu, 6 Oct 2022 10:51:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231324AbiJFKvQ (ORCPT ); Thu, 6 Oct 2022 06:51:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230512AbiJFKvO (ORCPT ); Thu, 6 Oct 2022 06:51:14 -0400 Received: from mta-01.yadro.com (mta-02.yadro.com [89.207.88.252]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69D4F75481; Thu, 6 Oct 2022 03:51:10 -0700 (PDT) Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id B331341226; Thu, 6 Oct 2022 10:51:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :x-mailer:message-id:date:date:subject:subject:from:from :received:received:received:received; s=mta-01; t=1665053467; x= 1666867868; bh=kYQfCnEQJDkqcoh2Mg1e02PjIiJU0zn6OjHD4WF63WY=; b=g VJDt3INqG63S1/HaBBV91jRkLF0ZhO8/Tyre1otQ+R2u0/s6PG/kruEOHmeRtCZU IZN3R3AjNpkfzbYoEWlNCyuUBy1Ay0xTBtG2qfiUq7O5TSE3oK7lOQpAd7sWpQ6A c4WwHz5HJciMsQtDYvM2zL1gbDvc5zChvc5XLK5Gls= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E8Nky8i4SFeY; Thu, 6 Oct 2022 13:51:07 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (T-EXCH-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 9F35141221; Thu, 6 Oct 2022 13:51:06 +0300 (MSK) Received: from T-EXCH-08.corp.yadro.com (172.17.11.58) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 6 Oct 2022 13:51:06 +0300 Received: from NB-591.corp.yadro.com (10.199.18.20) by T-EXCH-08.corp.yadro.com (172.17.11.58) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1118.9; Thu, 6 Oct 2022 13:51:05 +0300 From: Dmitry Bogdanov To: Martin Petersen , CC: Mike Christie , , , Dmitry Bogdanov Subject: [PATCH v2 0/5] scsi: target: make RTPI an TPG identifier Date: Thu, 6 Oct 2022 13:50:52 +0300 Message-ID: <20221006105057.30184-1-d.bogdanov@yadro.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.199.18.20] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-08.corp.yadro.com (172.17.11.58) Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org SAM-5 4.6.5.2 (Relative Port Identifier attribute) defines the attribute as unique across SCSI target ports: The Relative Port Identifier attribute identifies a SCSI target port or a SCSI initiator port relative to other SCSI ports in a SCSI target device and any SCSI initiator devices contained within that SCSI target device. A SCSI target device may assign relative port identifiers to its SCSI target ports and any SCSI initiator ports. If relative port identifiers are assigned, the SCSI target device shall assign each of its SCSI target ports and any SCSI initiator ports a unique relative port identifier from 1 to 65 535. SCSI target ports and SCSI initiator ports share the same number space. In the current TCM implementation, auto-incremented lun_rtpi weakly follows the model outlined by SAM-5 and SPC-4. In case of multiple SCSI target ports (se_portal_group's), which is common to scenario with multiple HBAs or multiple iSCSI/FC targets, it's possible to have two backstores (se_device's) with different values of lun_rtpi on the same SCSI target port. Similar issue happens during re-export. If a LUN of a backstore is removed from a target port and added again to the same target port, RTPI is incremented again and will be different from the first time. The two issues happen because each se_device increments RTPI for its own LUNs independently. The behaviour means that a SCSI application client can't reliably make any sense of RTPI values reported by a LUN as it's not really related to SCSI target ports. A conforming target implementation must ensure that RTPI field is unique per port. The patchset resolves the issue. Make RTPI be part of se_tpg instead of se_lun. Make it configurable. Changelog: v2: use XArray for tracking RTPI instead of linked list do not allow to change RTPI on enabled target port drop not needed patches Dmitry Bogdanov (2): scsi: target: core: Add RTPI field to target port scsi: target: core: Add RTPI attribute for target port Roman Bolshakov (3): scsi: target: core: Use RTPI from target port scsi: target: core: Drop device-based RTPI scsi: target: core: Add common port attributes drivers/target/target_core_alua.c | 4 +- drivers/target/target_core_configfs.c | 9 +- drivers/target/target_core_device.c | 43 +-------- drivers/target/target_core_fabric_configfs.c | 44 +++++++-- drivers/target/target_core_internal.h | 3 +- drivers/target/target_core_pr.c | 8 +- drivers/target/target_core_spc.c | 2 +- drivers/target/target_core_stat.c | 6 +- drivers/target/target_core_tpg.c | 98 ++++++++++++++++++-- include/target/target_core_base.h | 6 +-