From patchwork Thu Feb 24 17:55:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 546605 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 1BC22C433FE for ; Thu, 24 Feb 2022 17:56:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229662AbiBXR4b (ORCPT ); Thu, 24 Feb 2022 12:56:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231389AbiBXR42 (ORCPT ); Thu, 24 Feb 2022 12:56:28 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEB0223531F; Thu, 24 Feb 2022 09:55:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=ZkZQA+7eEA1SPtr9YEx1gUKQct/AwJ+pYWtdJAH61iw=; b=lvY29N4cuJpDGoKsRsdh2n+73F cK/MRI064BfggNbnl9wjREdmCTL0hdEgs/N0bvAMVHo+RLxnl4p07jKbj+L9Gh4NdmFVVO0RVy9Kd zoEaQ4zINaIsMQ2DMfInvlJyNWomDAOfjo/eY+bvkAUbiPEqltCnxIjaMdG6sRmgpzkRoGmLSUxpd 3FN5D3C6UaJ/rLjvxslJ0I0fRYQRFWjrutrEBNZxkL+9HCpL/20TSrjwYwJgR2xp6uc6Pi//+1pvQ Lh03Ot58xl9sgrVuujmEsAnWeJzZaW8aBrX7JZmS4ej0bfZ9bMtQB/GqgF64HTfSAozLCgJlhjNwV lMODDTNg==; Received: from 089144202139.atnat0011.highway.a1.net ([89.144.202.139] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNILN-001uQo-W6; Thu, 24 Feb 2022 17:55:58 +0000 From: Christoph Hellwig To: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Subject: [PATCH 1/8] target/pscsi: remove struct pscsi_plugin_task Date: Thu, 24 Feb 2022 18:55:45 +0100 Message-Id: <20220224175552.988286-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220224175552.988286-1-hch@lst.de> References: <20220224175552.988286-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Copy directly from the se_cmd CDB to the one in the scsi_request. This temporarily limits the pscsi backend to supporting only up to 16 byte CDBs, but this restriction will be lifted later in this series. Signed-off-by: Christoph Hellwig --- drivers/target/target_core_pscsi.c | 51 ++++++++++-------------------- drivers/target/target_core_pscsi.h | 4 --- 2 files changed, 17 insertions(+), 38 deletions(-) diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c index 807d06ecadee2..622158ed5d9ce 100644 --- a/drivers/target/target_core_pscsi.c +++ b/drivers/target/target_core_pscsi.c @@ -593,16 +593,14 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status, { struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); struct scsi_device *sd = pdv->pdv_sd; - struct pscsi_plugin_task *pt = cmd->priv; - unsigned char *cdb; + unsigned char *cdb = cmd->priv; + /* - * Special case for REPORT_LUNs handling where pscsi_plugin_task has - * not been allocated because TCM is handling the emulation directly. + * Special case for REPORT_LUNs which is emulated and not passed on. */ - if (!pt) + if (!cdb) return; - cdb = &pt->pscsi_cdb[0]; /* * Hack to make sure that Write-Protect modepage is set if R/O mode is * forced. @@ -963,30 +961,14 @@ pscsi_execute_cmd(struct se_cmd *cmd) struct scatterlist *sgl = cmd->t_data_sg; u32 sgl_nents = cmd->t_data_nents; struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); - struct pscsi_plugin_task *pt; struct request *req; sense_reason_t ret; - /* - * Dynamically alloc cdb space, since it may be larger than - * TCM_MAX_COMMAND_SIZE - */ - pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL); - if (!pt) { - return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - } - cmd->priv = pt; - - memcpy(pt->pscsi_cdb, cmd->t_task_cdb, - scsi_command_size(cmd->t_task_cdb)); - req = scsi_alloc_request(pdv->pdv_sd->request_queue, cmd->data_direction == DMA_TO_DEVICE ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); - if (IS_ERR(req)) { - ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - goto fail; - } + if (IS_ERR(req)) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; if (sgl) { ret = pscsi_map_sg(cmd, sgl, sgl_nents, req); @@ -996,8 +978,12 @@ pscsi_execute_cmd(struct se_cmd *cmd) req->end_io = pscsi_req_done; req->end_io_data = cmd; - scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb); - scsi_req(req)->cmd = &pt->pscsi_cdb[0]; + scsi_req(req)->cmd_len = scsi_command_size(cmd->t_task_cdb); + if (scsi_req(req)->cmd_len > BLK_MAX_CDB) { + ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + goto fail_put_request; + } + memcpy(scsi_req(req)->cmd, cmd->t_task_cdb, scsi_req(req)->cmd_len); if (pdv->pdv_sd->type == TYPE_DISK || pdv->pdv_sd->type == TYPE_ZBC) req->timeout = PS_TIMEOUT_DISK; @@ -1005,6 +991,8 @@ pscsi_execute_cmd(struct se_cmd *cmd) req->timeout = PS_TIMEOUT_OTHER; scsi_req(req)->retries = PS_RETRY; + cmd->priv = scsi_req(req)->cmd; + blk_execute_rq_nowait(req, cmd->sam_task_attr == TCM_HEAD_TAG, pscsi_req_done); @@ -1012,8 +1000,6 @@ pscsi_execute_cmd(struct se_cmd *cmd) fail_put_request: blk_mq_free_request(req); -fail: - kfree(pt); return ret; } @@ -1041,14 +1027,13 @@ static sector_t pscsi_get_blocks(struct se_device *dev) static void pscsi_req_done(struct request *req, blk_status_t status) { struct se_cmd *cmd = req->end_io_data; - struct pscsi_plugin_task *pt = cmd->priv; int result = scsi_req(req)->result; enum sam_status scsi_status = result & 0xff; + u8 *cdb = cmd->priv; if (scsi_status != SAM_STAT_GOOD) { pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" - " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], - result); + " 0x%02x Result: 0x%08x\n", cmd, cdb[0], result); } pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense); @@ -1060,14 +1045,12 @@ static void pscsi_req_done(struct request *req, blk_status_t status) break; default: pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" - " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], - result); + " 0x%02x Result: 0x%08x\n", cmd, cdb[0], result); target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); break; } blk_mq_free_request(req); - kfree(pt); } static const struct target_backend_ops pscsi_ops = { diff --git a/drivers/target/target_core_pscsi.h b/drivers/target/target_core_pscsi.h index e8458b5e85c92..23d9a6e340d41 100644 --- a/drivers/target/target_core_pscsi.h +++ b/drivers/target/target_core_pscsi.h @@ -23,10 +23,6 @@ struct block_device; struct scsi_device; struct Scsi_Host; -struct pscsi_plugin_task { - unsigned char pscsi_cdb[0]; -} ____cacheline_aligned; - #define PDF_HAS_CHANNEL_ID 0x01 #define PDF_HAS_TARGET_ID 0x02 #define PDF_HAS_LUN_ID 0x04