From patchwork Mon Jul 26 15:16:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Samoylenko X-Patchwork-Id: 486116 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0B98C4320A for ; Mon, 26 Jul 2021 15:17:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D1B460F51 for ; Mon, 26 Jul 2021 15:17:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235004AbhGZOhF (ORCPT ); Mon, 26 Jul 2021 10:37:05 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:44226 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S234985AbhGZOhD (ORCPT ); Mon, 26 Jul 2021 10:37:03 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id A1440488E6; Mon, 26 Jul 2021 15:17:29 +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 :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1627312648; x=1629127049; bh=VovvD/DzUmEBh0Fcm/HkRR9e2bn2i3hanHA OJjPW3Vw=; b=DcrBcNmFRdCNApk9nhun3I/cJJkv7hA6oN4kdRq1p85hMeg8uSH 7FwXi7wvb8Jgv3Lbq/z/LFgMBFbVxI8IueILVaNOdJYmw6f1xHDKp1tJud9FXEtc t22zN9TE5gJTU0GGX26ClpNN+Ha/jObsj4JWJtLjHGgEAR9bFB/oNTTE= 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 5zFT40KB23mW; Mon, 26 Jul 2021 18:17:28 +0300 (MSK) Received: from T-EXCH-04.corp.yadro.com (t-exch-04.corp.yadro.com [172.17.100.104]) (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 40C74412C6; Mon, 26 Jul 2021 18:17:28 +0300 (MSK) Received: from yadro.com (10.199.0.6) by T-EXCH-04.corp.yadro.com (172.17.100.104) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 26 Jul 2021 18:17:27 +0300 From: Sergey Samoylenko To: , , , , CC: , , Sergey Samoylenko Subject: [v2 1/2] target: allows backend drivers to fail with specific sense codes Date: Mon, 26 Jul 2021 18:16:45 +0300 Message-ID: <20210726151646.32631-2-s.samoylenko@yadro.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210726151646.32631-1-s.samoylenko@yadro.com> References: <20210726151646.32631-1-s.samoylenko@yadro.com> MIME-Version: 1.0 X-Originating-IP: [10.199.0.6] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-04.corp.yadro.com (172.17.100.104) Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Currently, backend drivers can fail IO with SAM_STAT_CHECK_CONDITION which gets us TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE. The patch adds a new helper that allows backend drivers to fail with specific sense codes. This is based on a patch from Mike Christie . Cc: Mike Christie Cc: David Disseldorp [ Moved target_complete_cmd_with_sense() helper to mainline ] Signed-off-by: Sergey Samoylenko --- drivers/target/target_core_transport.c | 21 ++++++++++++++++++--- include/target/target_core_backend.h | 1 + include/target/target_core_base.h | 2 ++ 3 files changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 26ceabe34de5..d2a2892bda9c 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -736,8 +736,7 @@ static void target_complete_failure_work(struct work_struct *work) { struct se_cmd *cmd = container_of(work, struct se_cmd, work); - transport_generic_request_failure(cmd, - TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); + transport_generic_request_failure(cmd, cmd->sense_reason); } /* @@ -855,7 +854,8 @@ static bool target_cmd_interrupted(struct se_cmd *cmd) } /* May be called from interrupt context so must not sleep. */ -void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +static void __target_complete_cmd(struct se_cmd *cmd, u8 scsi_status, + sense_reason_t sense_reason) { struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn; int success, cpu; @@ -865,6 +865,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) return; cmd->scsi_status = scsi_status; + cmd->sense_reason = sense_reason; spin_lock_irqsave(&cmd->t_state_lock, flags); switch (cmd->scsi_status) { @@ -893,8 +894,22 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) queue_work_on(cpu, target_completion_wq, &cmd->work); } + +void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) +{ + __target_complete_cmd(cmd, scsi_status, scsi_status ? + TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE : + TCM_NO_SENSE); +} EXPORT_SYMBOL(target_complete_cmd); +void target_complete_cmd_with_sense(struct se_cmd *cmd, + sense_reason_t sense_reason) +{ + __target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION, sense_reason); +} +EXPORT_SYMBOL(target_complete_cmd_with_sense); + void target_set_cmd_data_length(struct se_cmd *cmd, int length) { if (length < cmd->data_length) { diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index 1f78b09bba55..3cc50d30231a 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -75,6 +75,7 @@ void target_backend_unregister(const struct target_backend_ops *); void target_complete_cmd(struct se_cmd *, u8); void target_set_cmd_data_length(struct se_cmd *, int); +void target_complete_cmd_with_sense(struct se_cmd *, sense_reason_t); void target_complete_cmd_with_length(struct se_cmd *, u8, int); void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 85c16c266eac..8c85d3b83a70 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -453,6 +453,8 @@ enum target_core_dif_check { #define TCM_ACA_TAG 0x24 struct se_cmd { + /* Used for fail with specific sense codes */ + sense_reason_t sense_reason; /* SAM response code being sent to initiator */ u8 scsi_status; u8 scsi_asc;