From patchwork Tue Feb 1 18:33:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 539538 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 BBF1DC433F5 for ; Tue, 1 Feb 2022 18:33:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240640AbiBASdh (ORCPT ); Tue, 1 Feb 2022 13:33:37 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:22709 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241837AbiBASdf (ORCPT ); Tue, 1 Feb 2022 13:33:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643740415; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=//kog2s09td3mH9/Rkgjf+3auO0U/6/qyxFnJYJIMUo=; b=aXXNP4GM4X+dOVF54aG6rEdDzDlSLdDDg9Xa2tYPWpeBwteOdcEf2CsDGm/zQjEL7V166E +YdTlIUnfRx2GbcXt30eCAqPelfc0Z6Sil7A8bMG7ysLmD35Goh7ohgACOSTL/9dFhc1+K lPa6zOEGUwFyQN59HkRPCpzoMmkjjfw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-17-0hEBCDwdMPmLt4hplaJ1vA-1; Tue, 01 Feb 2022 13:33:32 -0500 X-MC-Unique: 0hEBCDwdMPmLt4hplaJ1vA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CDF811927820; Tue, 1 Feb 2022 18:33:20 +0000 (UTC) Received: from file01.intranet.prod.int.rdu2.redhat.com (file01.intranet.prod.int.rdu2.redhat.com [10.11.5.7]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2752234D41; Tue, 1 Feb 2022 18:33:13 +0000 (UTC) Received: from file01.intranet.prod.int.rdu2.redhat.com (localhost [127.0.0.1]) by file01.intranet.prod.int.rdu2.redhat.com (8.14.4/8.14.4) with ESMTP id 211IXCsI019523; Tue, 1 Feb 2022 13:33:12 -0500 Received: from localhost (mpatocka@localhost) by file01.intranet.prod.int.rdu2.redhat.com (8.14.4/8.14.4/Submit) with ESMTP id 211IXCnq019519; Tue, 1 Feb 2022 13:33:12 -0500 X-Authentication-Warning: file01.intranet.prod.int.rdu2.redhat.com: mpatocka owned process doing -bs Date: Tue, 1 Feb 2022 13:33:12 -0500 (EST) From: Mikulas Patocka X-X-Sender: mpatocka@file01.intranet.prod.int.rdu2.redhat.com To: =?iso-8859-15?q?Javier_Gonz=E1lez?= cc: Chaitanya Kulkarni , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "linux-nvme@lists.infradead.org" , linux-fsdevel , Jens Axboe , "msnitzer@redhat.com >> msnitzer@redhat.com" , Bart Van Assche , "martin.petersen@oracle.com >> Martin K. Petersen" , "roland@purestorage.com" , Hannes Reinecke , "kbus @imap.gmail.com>> Keith Busch" , Christoph Hellwig , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , "lsf-pc@lists.linux-foundation.org" , "djwong@kernel.org" , "josef@toxicpanda.com" , "clm@fb.com" , "dsterba@suse.com" , "tytso@mit.edu" , "jack@suse.com" , Kanchan Joshi Subject: [RFC PATCH 2/3] nvme: add copy offload support In-Reply-To: Message-ID: References: <20220201102122.4okwj2gipjbvuyux@mpHalley-2> User-Agent: Alpine 2.02 (LRH 1266 2009-07-14) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org This patch adds copy offload support to the nvme host driver. The function nvme_setup_read_token stores namespace and location in the token and the function nvme_setup_write_token retrieves information from the token and submits the copy command to the device. Signed-off-by: Mikulas Patocka --- drivers/nvme/host/core.c | 94 +++++++++++++++++++++++++++++++++++++++++++++ drivers/nvme/host/fc.c | 5 ++ drivers/nvme/host/nvme.h | 1 drivers/nvme/host/pci.c | 5 ++ drivers/nvme/host/rdma.c | 5 ++ drivers/nvme/host/tcp.c | 5 ++ drivers/nvme/target/loop.c | 5 ++ include/linux/nvme.h | 33 +++++++++++++++ 8 files changed, 153 insertions(+) Index: linux-2.6/drivers/nvme/host/core.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/core.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/core.c 2022-02-01 18:34:19.000000000 +0100 @@ -975,6 +975,85 @@ static inline blk_status_t nvme_setup_rw return 0; } +struct nvme_copy_token { + char subsys[4]; + struct nvme_ns *ns; + u64 src_sector; + u64 sectors; +}; + +static inline blk_status_t nvme_setup_read_token(struct nvme_ns *ns, struct request *req) +{ + struct bio *bio = req->bio; + struct nvme_copy_token *token = page_to_virt(bio->bi_io_vec[0].bv_page) + bio->bi_io_vec[0].bv_offset; + memcpy(token->subsys, "nvme", 4); + token->ns = ns; + token->src_sector = bio->bi_iter.bi_sector; + token->sectors = bio->bi_iter.bi_size >> 9; + return 0; +} + +static inline blk_status_t nvme_setup_write_token(struct nvme_ns *ns, + struct request *req, struct nvme_command *cmnd) +{ + sector_t src_sector, dst_sector, n_sectors; + u64 src_lba, dst_lba, n_lba; + + unsigned n_descriptors, i; + struct nvme_copy_desc *descriptors; + + struct bio *bio = req->bio; + struct nvme_copy_token *token = page_to_virt(bio->bi_io_vec[0].bv_page) + bio->bi_io_vec[0].bv_offset; + if (unlikely(memcmp(token->subsys, "nvme", 4))) + return BLK_STS_NOTSUPP; + if (unlikely(token->ns != ns)) + return BLK_STS_NOTSUPP; + + src_sector = token->src_sector; + dst_sector = bio->bi_iter.bi_sector; + n_sectors = token->sectors; + if (WARN_ON(n_sectors != bio->bi_iter.bi_size >> 9)) + return BLK_STS_NOTSUPP; + + src_lba = nvme_sect_to_lba(ns, src_sector); + dst_lba = nvme_sect_to_lba(ns, dst_sector); + n_lba = nvme_sect_to_lba(ns, n_sectors); + + if (unlikely(nvme_lba_to_sect(ns, src_lba) != src_sector) || + unlikely(nvme_lba_to_sect(ns, dst_lba) != dst_sector) || + unlikely(nvme_lba_to_sect(ns, n_lba) != n_sectors)) + return BLK_STS_NOTSUPP; + + if (WARN_ON(!n_lba)) + return BLK_STS_NOTSUPP; + + n_descriptors = (n_lba + 0xffff) / 0x10000; + descriptors = kzalloc(n_descriptors * sizeof(struct nvme_copy_desc), GFP_ATOMIC | __GFP_NOWARN); + if (unlikely(!descriptors)) + return BLK_STS_RESOURCE; + + memset(cmnd, 0, sizeof(*cmnd)); + cmnd->copy.opcode = nvme_cmd_copy; + cmnd->copy.nsid = cpu_to_le32(ns->head->ns_id); + cmnd->copy.sdlba = cpu_to_le64(dst_lba); + cmnd->copy.length = n_descriptors - 1; + + for (i = 0; i < n_descriptors; i++) { + u64 this_step = min(n_lba, (u64)0x10000); + descriptors[i].slba = cpu_to_le64(src_lba); + descriptors[i].length = cpu_to_le16(this_step - 1); + src_lba += this_step; + n_lba -= this_step; + } + + req->special_vec.bv_page = virt_to_page(descriptors); + req->special_vec.bv_offset = offset_in_page(descriptors); + req->special_vec.bv_len = n_descriptors * sizeof(struct nvme_copy_desc); + req->rq_flags |= RQF_SPECIAL_PAYLOAD; + + return 0; +} + void nvme_cleanup_cmd(struct request *req) { if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { @@ -1032,6 +1111,12 @@ blk_status_t nvme_setup_cmd(struct nvme_ case REQ_OP_ZONE_APPEND: ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_zone_append); break; + case REQ_OP_COPY_READ_TOKEN: + ret = nvme_setup_read_token(ns, req); + break; + case REQ_OP_COPY_WRITE_TOKEN: + ret = nvme_setup_write_token(ns, req, cmd); + break; default: WARN_ON_ONCE(1); return BLK_STS_IOERR; @@ -1865,6 +1950,8 @@ static void nvme_update_disk_info(struct blk_queue_max_write_zeroes_sectors(disk->queue, ns->ctrl->max_zeroes_sectors); + blk_queue_max_copy_sectors(disk->queue, ns->ctrl->max_copy_sectors); + set_disk_ro(disk, (id->nsattr & NVME_NS_ATTR_RO) || test_bit(NVME_NS_FORCE_RO, &ns->flags)); } @@ -2891,6 +2978,12 @@ static int nvme_init_non_mdts_limits(str else ctrl->max_zeroes_sectors = 0; + if (ctrl->oncs & NVME_CTRL_ONCS_COPY) { + ctrl->max_copy_sectors = 1U << 24; + } else { + ctrl->max_copy_sectors = 0; + } + if (nvme_ctrl_limited_cns(ctrl)) return 0; @@ -4716,6 +4809,7 @@ static inline void _nvme_check_size(void { BUILD_BUG_ON(sizeof(struct nvme_common_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); + BUILD_BUG_ON(sizeof(struct nvme_copy_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_identify) != 64); BUILD_BUG_ON(sizeof(struct nvme_features) != 64); BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64); Index: linux-2.6/drivers/nvme/host/nvme.h =================================================================== --- linux-2.6.orig/drivers/nvme/host/nvme.h 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/nvme.h 2022-02-01 18:34:19.000000000 +0100 @@ -277,6 +277,7 @@ struct nvme_ctrl { #ifdef CONFIG_BLK_DEV_ZONED u32 max_zone_append; #endif + u32 max_copy_sectors; u16 crdt[3]; u16 oncs; u16 oacs; Index: linux-2.6/include/linux/nvme.h =================================================================== --- linux-2.6.orig/include/linux/nvme.h 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/include/linux/nvme.h 2022-02-01 18:34:19.000000000 +0100 @@ -335,6 +335,8 @@ enum { NVME_CTRL_ONCS_WRITE_ZEROES = 1 << 3, NVME_CTRL_ONCS_RESERVATIONS = 1 << 5, NVME_CTRL_ONCS_TIMESTAMP = 1 << 6, + NVME_CTRL_ONCS_VERIFY = 1 << 7, + NVME_CTRL_ONCS_COPY = 1 << 8, NVME_CTRL_VWC_PRESENT = 1 << 0, NVME_CTRL_OACS_SEC_SUPP = 1 << 0, NVME_CTRL_OACS_DIRECTIVES = 1 << 5, @@ -704,6 +706,7 @@ enum nvme_opcode { nvme_cmd_resv_report = 0x0e, nvme_cmd_resv_acquire = 0x11, nvme_cmd_resv_release = 0x15, + nvme_cmd_copy = 0x19, nvme_cmd_zone_mgmt_send = 0x79, nvme_cmd_zone_mgmt_recv = 0x7a, nvme_cmd_zone_append = 0x7d, @@ -872,6 +875,35 @@ enum { NVME_RW_DTYPE_STREAMS = 1 << 4, }; +struct nvme_copy_command { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd2; + __le64 metadata; + union nvme_data_ptr dptr; + __le64 sdlba; + __u8 length; + __u8 control2; + __le16 control; + __le32 dspec; + __le32 reftag; + __le16 apptag; + __le16 appmask; +}; + +struct nvme_copy_desc { + __u64 rsvd; + __le64 slba; + __le16 length; + __u16 rsvd2; + __u32 rsvd3; + __le32 reftag; + __le16 apptag; + __le16 appmask; +}; + struct nvme_dsm_cmd { __u8 opcode; __u8 flags; @@ -1441,6 +1473,7 @@ struct nvme_command { union { struct nvme_common_command common; struct nvme_rw_command rw; + struct nvme_copy_command copy; struct nvme_identify identify; struct nvme_features features; struct nvme_create_cq create_cq; Index: linux-2.6/drivers/nvme/host/pci.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/pci.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/pci.c 2022-02-01 18:34:19.000000000 +0100 @@ -949,6 +949,11 @@ static blk_status_t nvme_queue_rq(struct struct nvme_iod *iod = blk_mq_rq_to_pdu(req); blk_status_t ret; + if (unlikely((req->cmd_flags & REQ_OP_MASK) == REQ_OP_COPY_READ_TOKEN)) { + blk_mq_end_request(req, BLK_STS_OK); + return BLK_STS_OK; + } + /* * We should not need to do this, but we're still using this to * ensure we can drain requests on a dying queue. Index: linux-2.6/drivers/nvme/host/fc.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/fc.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/fc.c 2022-02-01 18:34:19.000000000 +0100 @@ -2780,6 +2780,11 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *h u32 data_len; blk_status_t ret; + if (unlikely((rq->cmd_flags & REQ_OP_MASK) == REQ_OP_COPY_READ_TOKEN)) { + blk_mq_end_request(rq, BLK_STS_OK); + return BLK_STS_OK; + } + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE || !nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq); Index: linux-2.6/drivers/nvme/host/rdma.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/rdma.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/rdma.c 2022-02-01 18:34:19.000000000 +0100 @@ -2048,6 +2048,11 @@ static blk_status_t nvme_rdma_queue_rq(s blk_status_t ret; int err; + if (unlikely((rq->cmd_flags & REQ_OP_MASK) == REQ_OP_COPY_READ_TOKEN)) { + blk_mq_end_request(rq, BLK_STS_OK); + return BLK_STS_OK; + } + WARN_ON_ONCE(rq->tag < 0); if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) Index: linux-2.6/drivers/nvme/host/tcp.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/tcp.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/host/tcp.c 2022-02-01 18:34:19.000000000 +0100 @@ -2372,6 +2372,11 @@ static blk_status_t nvme_tcp_queue_rq(st bool queue_ready = test_bit(NVME_TCP_Q_LIVE, &queue->flags); blk_status_t ret; + if (unlikely((rq->cmd_flags & REQ_OP_MASK) == REQ_OP_COPY_READ_TOKEN)) { + blk_mq_end_request(rq, BLK_STS_OK); + return BLK_STS_OK; + } + if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq); Index: linux-2.6/drivers/nvme/target/loop.c =================================================================== --- linux-2.6.orig/drivers/nvme/target/loop.c 2022-02-01 18:34:19.000000000 +0100 +++ linux-2.6/drivers/nvme/target/loop.c 2022-02-01 18:34:19.000000000 +0100 @@ -138,6 +138,11 @@ static blk_status_t nvme_loop_queue_rq(s bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); blk_status_t ret; + if (unlikely((req->cmd_flags & REQ_OP_MASK) == REQ_OP_COPY_READ_TOKEN)) { + blk_mq_end_request(req, BLK_STS_OK); + return BLK_STS_OK; + } + if (!nvme_check_ready(&queue->ctrl->ctrl, req, queue_ready)) return nvme_fail_nonready_command(&queue->ctrl->ctrl, req);