From patchwork Tue Sep 4 16:21:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Edwards X-Patchwork-Id: 10587621 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A4DFA13AC for ; Tue, 4 Sep 2018 16:22:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 82F4729D58 for ; Tue, 4 Sep 2018 16:22:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7657F29D6A; Tue, 4 Sep 2018 16:22:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CFD5229D09 for ; Tue, 4 Sep 2018 16:22:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726367AbeIDUrw (ORCPT ); Tue, 4 Sep 2018 16:47:52 -0400 Received: from legacy.ddn.com ([64.47.133.206]:26943 "EHLO legacy.ddn.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726347AbeIDUrw (ORCPT ); Tue, 4 Sep 2018 16:47:52 -0400 Received: from LAX-EX-CAHT3.datadirect.datadirectnet.com (10.8.103.85) by LAX-EX-CAHT3.datadirect.datadirectnet.com (10.8.103.85) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 4 Sep 2018 09:22:02 -0700 Received: from LAX-EX-CAHT1.datadirect.datadirectnet.com (10.8.103.81) by LAX-EX-CAHT3.datadirect.datadirectnet.com (10.8.103.85) with Microsoft SMTP Server (TLS) id 15.0.1367.3 via Frontend Transport; Tue, 4 Sep 2018 09:22:02 -0700 Received: from psuche.datadirect.datadirectnet.com (10.48.114.46) by LAX-EX-CAHT1.datadirect.datadirectnet.com (10.8.103.81) with Microsoft SMTP Server (TLS) id 14.3.389.1; Tue, 4 Sep 2018 09:22:01 -0700 From: Greg Edwards To: , CC: "Nicholas A. Bellinger" , "Martin K. Petersen" , Mike Christie , "Greg Edwards" Subject: [PATCH v4] target/iblock: split T10 PI SGL across command bios Date: Tue, 4 Sep 2018 10:21:33 -0600 Message-ID: <20180904162133.30456-1-gedwards@ddn.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180808193140.1463-1-gedwards@ddn.com> References: <20180808193140.1463-1-gedwards@ddn.com> MIME-Version: 1.0 X-Originating-IP: [10.48.114.46] Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When T10 PI is enabled on a backing device for the iblock backstore, the PI SGL for the entire command is attached to the first bio only. This works fine if the command is covered by a single bio, but can result in ref tag errors in the client for the other bios in a multi-bio command, e.g. [ 47.631236] sda: ref tag error at location 2048 (rcvd 0) [ 47.637658] sda: ref tag error at location 4096 (rcvd 0) [ 47.644228] sda: ref tag error at location 6144 (rcvd 0) The command will be split into multiple bios if the number of data SG elements exceeds BIO_MAX_PAGES (see iblock_get_bio()). The bios may later be split again in the block layer on the host after iblock_submit_bios(), depending on the queue limits of the backing device. The block and SCSI layers will pass through the whole PI SGL down to the LLDD however that first bio is split up, but the LLDD may only use the portion that corresponds to the data length (depends on the LLDD, tested with scsi_debug). Split the PI SGL across the bios in the command, so each bio's bio_integrity_payload contains the protection information for the data in the bio. Use an sg_mapping_iter to keep track of where we are in PI SGL, so we know where to start with the next bio. Signed-off-by: Greg Edwards --- Changes from v3: * cast a size_t as unsigned long in a pr_debug() for 32-bit arches, turned up by the kbuild test robot Changes from v2: * add back min(cmd->t_prot_nents, BIO_MAX_PAGES) for bio_integrity_alloc() from v1 Changes from v1: * expand commit message * use an sg_mapping_iter to track where we are in the PI SGL drivers/target/target_core_iblock.c | 55 ++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 17 deletions(-) diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index ce1321a5cb7b..b9bd100c5932 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -635,14 +635,15 @@ static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) } static int -iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) +iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, + struct sg_mapping_iter *miter) { struct se_device *dev = cmd->se_dev; struct blk_integrity *bi; struct bio_integrity_payload *bip; struct iblock_dev *ib_dev = IBLOCK_DEV(dev); - struct scatterlist *sg; - int i, rc; + int rc; + size_t resid, len; bi = bdev_get_integrity(ib_dev->ibd_bd); if (!bi) { @@ -650,31 +651,40 @@ iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) return -ENODEV; } - bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); + bip = bio_integrity_alloc(bio, GFP_NOIO, + min_t(unsigned int, cmd->t_prot_nents, BIO_MAX_PAGES)); if (IS_ERR(bip)) { pr_err("Unable to allocate bio_integrity_payload\n"); return PTR_ERR(bip); } - bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * - dev->prot_length; - bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; + bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); + bip_set_seed(bip, bio->bi_iter.bi_sector); pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, (unsigned long long)bip->bip_iter.bi_sector); - for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { + resid = bip->bip_iter.bi_size; + while (resid > 0 && sg_miter_next(miter)) { - rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, - sg->offset); - if (rc != sg->length) { + len = min_t(size_t, miter->length, resid); + rc = bio_integrity_add_page(bio, miter->page, len, + offset_in_page(miter->addr)); + if (rc != len) { pr_err("bio_integrity_add_page() failed; %d\n", rc); + sg_miter_stop(miter); return -ENOMEM; } - pr_debug("Added bio integrity page: %p length: %d offset; %d\n", - sg_page(sg), sg->length, sg->offset); + pr_debug("Added bio integrity page: %p length: %lu offset: %lu\n", + miter->page, (unsigned long)len, + offset_in_page(miter->addr)); + + resid -= len; + if (len < miter->length) + miter->consumed -= miter->length - len; } + sg_miter_stop(miter); return 0; } @@ -686,12 +696,13 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, struct se_device *dev = cmd->se_dev; sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); struct iblock_req *ibr; - struct bio *bio, *bio_start; + struct bio *bio; struct bio_list list; struct scatterlist *sg; u32 sg_num = sgl_nents; unsigned bio_cnt; - int i, op, op_flags = 0; + int i, rc, op, op_flags = 0; + struct sg_mapping_iter prot_miter; if (data_direction == DMA_TO_DEVICE) { struct iblock_dev *ib_dev = IBLOCK_DEV(dev); @@ -726,13 +737,17 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, if (!bio) goto fail_free_ibr; - bio_start = bio; bio_list_init(&list); bio_list_add(&list, bio); refcount_set(&ibr->pending, 2); bio_cnt = 1; + if (cmd->prot_type && dev->dev_attrib.pi_prot_type) + sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, + op == REQ_OP_READ ? SG_MITER_FROM_SG : + SG_MITER_TO_SG); + for_each_sg(sgl, sg, sgl_nents, i) { /* * XXX: if the length the device accepts is shorter than the @@ -741,6 +756,12 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, */ while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) != sg->length) { + if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { + rc = iblock_alloc_bip(cmd, bio, &prot_miter); + if (rc) + goto fail_put_bios; + } + if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { iblock_submit_bios(&list); bio_cnt = 0; @@ -762,7 +783,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, } if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { - int rc = iblock_alloc_bip(cmd, bio_start); + rc = iblock_alloc_bip(cmd, bio, &prot_miter); if (rc) goto fail_put_bios; }