From patchwork Thu Jun 30 12:22:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anastasia Kovaleva X-Patchwork-Id: 12901771 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 EDBDDCCA482 for ; Thu, 30 Jun 2022 12:33:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234792AbiF3MdA (ORCPT ); Thu, 30 Jun 2022 08:33:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234721AbiF3Mc5 (ORCPT ); Thu, 30 Jun 2022 08:32:57 -0400 Received: from mta-01.yadro.com (mta-02.yadro.com [89.207.88.252]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A63823669E; Thu, 30 Jun 2022 05:32:56 -0700 (PDT) Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 0A8A140885; Thu, 30 Jun 2022 12:23:04 +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=1656591782; x= 1658406183; bh=E97ee0K4qd9gj8lsBLjPYCh5YLg+ElCE9B37pFEjb8o=; b=I 2LOQs+fIhEkEMwlKiVv5kdA54/tiKBKj8Cq3e91FpJOUA369t4VQS/gWTmUZorqL CCgVGkSXR9wPtdu3FJFeT99DHSBzqRJlrxHqP6krPB+tXq95eL1F81wL4KZ4Q08S n3m4WktDZXz+ziz+T+vjqP8AfrIx9b4e5p48NuHw4A= 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 FMblhjtk2jhW; Thu, 30 Jun 2022 15:23:02 +0300 (MSK) Received: from T-EXCH-01.corp.yadro.com (t-exch-01.corp.yadro.com [172.17.10.101]) (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 C7CC440416; Thu, 30 Jun 2022 15:23:02 +0300 (MSK) Received: from T-EXCH-10.corp.yadro.com (172.17.11.60) by T-EXCH-01.corp.yadro.com (172.17.10.101) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 30 Jun 2022 15:23:02 +0300 Received: from localhost (10.199.0.81) by T-EXCH-10.corp.yadro.com (172.17.11.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.986.22; Thu, 30 Jun 2022 15:23:01 +0300 From: Anastasia Kovaleva To: CC: , Subject: [PATCH 0/3] Make target send correct io limits Date: Thu, 30 Jun 2022 15:22:38 +0300 Message-ID: <20220630122241.1658-1-a.kovaleva@yadro.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Originating-IP: [10.199.0.81] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-10.corp.yadro.com (172.17.11.60) Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org Currently iblock always reports MAXIMUM TRANSFER LENGTH in 512b units regardless of the LU block size. Target block size: target:~ # fdisk -l /dev/nullb0 Disk /dev/nullb0: 250 GiB, 268435456000 bytes, 65536000 sectors Units: sectors of 1 * 4096 = 4096 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Initiator block size: initiator:~ # fdisk -l /dev/sdc Disk /dev/sdc: 250 GiB, 268435456000 bytes, 65536000 sectors Disk model: nullb0 Units: sectors of 1 * 4096 = 4096 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 131072 bytes target max transfer length limit: target:~ # cat /sys/block/nullb0/queue/max_hw_sectors_kb 128 So the maximum transfer length should be 128 * 1024 / 4096 = 32 blocks But the target sends MTL in 512b units, so the initiators see 256 blocks instead. initiator:~ # sg_inq -p 0xb0 /dev/sdc VPD INQUIRY: Block limits page (SBC) Maximum compare and write length: 1 blocks Optimal transfer length granularity: 1 blocks Maximum transfer length: 256 blocks Optimal transfer length: 32 blocks Maximum prefetch transfer length: 0 blocks [ignored] This happens because MAXIMUM TRANSFER LENGTH field in VPD Block Limits page is derived from dev->dev_attrib.hw_max_sectors which happens to be in 512b units for iblock. This patch series fixes this issue and removes some special-casing for other backstores. Anastasia Kovaleva (3): target: core: Send mtl in blocks target: core: make hw_max_sectors store the sectors amount in blocks target: core: Change the way target_xcopy_do_work sets restiction on max io drivers/target/target_core_configfs.c | 2 - drivers/target/target_core_file.c | 1 - drivers/target/target_core_iblock.c | 3 +- drivers/target/target_core_spc.c | 7 ++- drivers/target/target_core_xcopy.c | 68 ++++++++++++++------------- drivers/target/target_core_xcopy.h | 2 +- include/target/target_core_base.h | 1 - 7 files changed, 45 insertions(+), 39 deletions(-)