From patchwork Wed Aug 9 20:23:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 713254 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 D6675C04FDF for ; Wed, 9 Aug 2023 20:24:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234518AbjHIUYR (ORCPT ); Wed, 9 Aug 2023 16:24:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234451AbjHIUYO (ORCPT ); Wed, 9 Aug 2023 16:24:14 -0400 Received: from mail-pg1-f176.google.com (mail-pg1-f176.google.com [209.85.215.176]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5C422136; Wed, 9 Aug 2023 13:24:03 -0700 (PDT) Received: by mail-pg1-f176.google.com with SMTP id 41be03b00d2f7-56518bb1552so201283a12.0; Wed, 09 Aug 2023 13:24:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691612643; x=1692217443; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=me3ElenHYRVvbr1VLAxmTuaND4JiSTtfliXTYye97+M=; b=gAJT2bykjvu5/BNrh1ck+T9TPObX7GFA7QqaPUEcDNAJ3/no/Cw3oNm+UlYSnHXZOF uwgSwrLw4USmiVVO3e/cHdIBY6jrAmbyoR51hlKZyJbkQEpEaFQiMx3fvWr/ikYXEQeI YAicaf5ood6xBikHeqteIQN68IHRU3PVWrhibEtiXpAK8sKsVvNfzGz1/Ul9EBxTmYzd 8EAllNp1ifRfmpUbs52P60CtS6yBAzzB2vch23Y2m99786OrwM775GAqaR6QApZpi4u3 zV4g5jwTU4mJLfGv7pNvr82UART28UD6oVP2O/PyAgnUydS3L1rLKtVUkvS27wwizStI rlMQ== X-Gm-Message-State: AOJu0YxUUNUNJD00VkAXgu18Z+hbw9kSiRzpciItlcoYlLzecrc1zq71 vEYzker2IJNJ6knm8GBOR3Y= X-Google-Smtp-Source: AGHT+IFGmwM09BcbZuN+OxgJ2+WeL0ZpcRMCNDQFGsx/rKB/DhHITjLa33WLu6XXNocOmR5CCtK0XA== X-Received: by 2002:a17:90a:950e:b0:268:f20:46b with SMTP id t14-20020a17090a950e00b002680f20046bmr334339pjo.38.1691612643067; Wed, 09 Aug 2023 13:24:03 -0700 (PDT) Received: from bvanassche-glaptop2.roam.corp.google.com ([98.51.102.78]) by smtp.gmail.com with ESMTPSA id gq9-20020a17090b104900b002694da8a9cdsm1868103pjb.48.2023.08.09.13.24.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 13:24:02 -0700 (PDT) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Jaegeuk Kim , Christoph Hellwig , Bart Van Assche , Damien Le Moal , "Martin K . Petersen" , Ming Lei , "James E.J. Bottomley" Subject: [PATCH v7 3/7] scsi: core: Retry unaligned zoned writes Date: Wed, 9 Aug 2023 13:23:44 -0700 Message-ID: <20230809202355.1171455-4-bvanassche@acm.org> X-Mailer: git-send-email 2.41.0.640.ga95def55d0-goog In-Reply-To: <20230809202355.1171455-1-bvanassche@acm.org> References: <20230809202355.1171455-1-bvanassche@acm.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org If zoned writes (REQ_OP_WRITE) for a sequential write required zone have a starting LBA that differs from the write pointer, e.g. because zoned writes have been reordered, then the storage device will respond with an UNALIGNED WRITE COMMAND error. Send commands that failed with an unaligned write error to the SCSI error handler if zone write locking is disabled. Let the SCSI error handler sort SCSI commands per LBA before resubmitting these. If zone write locking is disabled, increase the number of retries for write commands sent to a sequential zone to the maximum number of outstanding commands because in the worst case the number of times reordered zoned writes have to be retried is (number of outstanding writes per sequential zone) - 1. Cc: Damien Le Moal Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Ming Lei Signed-off-by: Bart Van Assche --- drivers/scsi/scsi_error.c | 37 +++++++++++++++++++++++++++++++++++++ drivers/scsi/scsi_lib.c | 1 + drivers/scsi/sd.c | 3 +++ include/scsi/scsi.h | 1 + 4 files changed, 42 insertions(+) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index c67cdcdc3ba8..c624b9c8fdab 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -698,6 +699,16 @@ enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd) fallthrough; case ILLEGAL_REQUEST: + /* + * Unaligned write command. This may indicate that zoned writes + * have been received by the device in the wrong order. If zone + * write locking is disabled, retry after all pending commands + * have completed. + */ + if (sshdr.asc == 0x21 && sshdr.ascq == 0x04 && + scsi_cmd_to_rq(scmd)->q->limits.use_zone_write_lock) + return NEEDS_DELAYED_RETRY; + if (sshdr.asc == 0x20 || /* Invalid command operation code */ sshdr.asc == 0x21 || /* Logical block address out of range */ sshdr.asc == 0x22 || /* Invalid function */ @@ -2186,6 +2197,25 @@ void scsi_eh_ready_devs(struct Scsi_Host *shost, } EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); +/* + * Returns a negative value if @_a has a lower starting sector than @_b, zero if + * both have the same starting sector and a positive value otherwise. + */ +static int scsi_cmp_sector(void *priv, const struct list_head *_a, + const struct list_head *_b) +{ + struct scsi_cmnd *a = list_entry(_a, typeof(*a), eh_entry); + struct scsi_cmnd *b = list_entry(_b, typeof(*b), eh_entry); + const sector_t pos_a = blk_rq_pos(scsi_cmd_to_rq(a)); + const sector_t pos_b = blk_rq_pos(scsi_cmd_to_rq(b)); + + if (pos_a < pos_b) + return -1; + if (pos_a > pos_b) + return 1; + return 0; +} + /** * scsi_eh_flush_done_q - finish processed commands or retry them. * @done_q: list_head of processed commands. @@ -2194,6 +2224,13 @@ void scsi_eh_flush_done_q(struct list_head *done_q) { struct scsi_cmnd *scmd, *next; + /* + * Sort pending SCSI commands in starting sector order. This is + * important if one of the SCSI devices associated with @shost is a + * zoned block device for which zone write locking is disabled. + */ + list_sort(NULL, done_q, scsi_cmp_sector); + list_for_each_entry_safe(scmd, next, done_q, eh_entry) { list_del_init(&scmd->eh_entry); if (scsi_device_online(scmd->device) && diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 59176946ab56..69da8aee13df 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1443,6 +1443,7 @@ static void scsi_complete(struct request *rq) case ADD_TO_MLQUEUE: scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); break; + case NEEDS_DELAYED_RETRY: default: scsi_eh_scmd_add(cmd); break; diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3c668cfb146d..3716392daa2c 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1235,6 +1235,9 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd) cmd->transfersize = sdp->sector_size; cmd->underflow = nr_blocks << 9; cmd->allowed = sdkp->max_retries; + if (rq->q->limits.use_zone_write_lock && + blk_rq_is_seq_zoned_write(rq)) + cmd->allowed += rq->q->nr_requests; cmd->sdb.length = nr_blocks * sdp->sector_size; SCSI_LOG_HLQUEUE(1, diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index ec093594ba53..6600db046227 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -93,6 +93,7 @@ static inline int scsi_status_is_check_condition(int status) * Internal return values. */ enum scsi_disposition { + NEEDS_DELAYED_RETRY = 0x2000, NEEDS_RETRY = 0x2001, SUCCESS = 0x2002, FAILED = 0x2003,