From patchwork Wed May 19 11:13:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shai Malin X-Patchwork-Id: 443929 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=-16.7 required=3.0 tests=BAYES_00, 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 9DDA6C43460 for ; Wed, 19 May 2021 11:17:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 737DB6108B for ; Wed, 19 May 2021 11:17:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349061AbhESLSj (ORCPT ); Wed, 19 May 2021 07:18:39 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:14892 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348926AbhESLSi (ORCPT ); Wed, 19 May 2021 07:18:38 -0400 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 14JBAXVQ007727; Wed, 19 May 2021 04:15:01 -0700 Received: from dc5-exch01.marvell.com ([199.233.59.181]) by mx0b-0016f401.pphosted.com with ESMTP id 38mqcwhy46-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Wed, 19 May 2021 04:15:01 -0700 Received: from DC5-EXCH01.marvell.com (10.69.176.38) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 19 May 2021 04:14:59 -0700 Received: from lbtlvb-pcie154.il.qlogic.org (10.69.176.80) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 19 May 2021 04:14:55 -0700 From: Shai Malin To: , , , , , , , CC: , , , , , , "Dean Balandin" Subject: [RFC PATCH v5 07/27] nvme-tcp-offload: Add IO level implementation Date: Wed, 19 May 2021 14:13:20 +0300 Message-ID: <20210519111340.20613-8-smalin@marvell.com> X-Mailer: git-send-email 2.16.6 In-Reply-To: <20210519111340.20613-1-smalin@marvell.com> References: <20210519111340.20613-1-smalin@marvell.com> MIME-Version: 1.0 X-Proofpoint-GUID: SDvauFUdxSRdR3O7H1z_LK7294E1l_HF X-Proofpoint-ORIG-GUID: SDvauFUdxSRdR3O7H1z_LK7294E1l_HF X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-05-19_04:2021-05-19,2021-05-19 signatures=0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Dean Balandin In this patch, we present the IO level functionality. The nvme-tcp-offload shall work on the IO-level, meaning the nvme-tcp-offload ULP module shall pass the request to the nvme-tcp-offload vendor driver and shall expect for the request completion. No additional handling is needed in between, this design will reduce the CPU utilization as we will describe below. The nvme-tcp-offload vendor driver shall register to nvme-tcp-offload ULP with the following IO-path ops: - init_req - send_req - in order to pass the request to the handling of the offload driver that shall pass it to the vendor specific device - poll_queue The vendor driver will manage the context from which the request will be executed and the request aggregations. Once the IO completed, the nvme-tcp-offload vendor driver shall call command.done() that shall invoke the nvme-tcp-offload ULP layer for completing the request. This patch also contains initial definition of nvme_tcp_ofld_queue_rq(). Acked-by: Igor Russkikh Signed-off-by: Dean Balandin Signed-off-by: Prabhakar Kushwaha Signed-off-by: Omkar Kulkarni Signed-off-by: Michal Kalderon Signed-off-by: Ariel Elior Signed-off-by: Shai Malin Reviewed-by: Hannes Reinecke Reviewed-by: Himanshu Madhani --- drivers/nvme/host/tcp-offload.c | 96 ++++++++++++++++++++++++++++++--- 1 file changed, 88 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/host/tcp-offload.c b/drivers/nvme/host/tcp-offload.c index 8ed7668d987a..276b8475ac85 100644 --- a/drivers/nvme/host/tcp-offload.c +++ b/drivers/nvme/host/tcp-offload.c @@ -127,7 +127,10 @@ void nvme_tcp_ofld_req_done(struct nvme_tcp_ofld_req *req, union nvme_result *result, __le16 status) { - /* Placeholder - complete request with/without error */ + struct request *rq = blk_mq_rq_from_pdu(req); + + if (!nvme_try_complete_req(rq, cpu_to_le16(status << 1), *result)) + nvme_complete_rq(rq); } struct nvme_tcp_ofld_dev * @@ -700,6 +703,34 @@ static void nvme_tcp_ofld_free_ctrl(struct nvme_ctrl *nctrl) kfree(ctrl); } +static void nvme_tcp_ofld_set_sg_null(struct nvme_command *c) +{ + struct nvme_sgl_desc *sg = &c->common.dptr.sgl; + + sg->addr = 0; + sg->length = 0; + sg->type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A; +} + +inline void nvme_tcp_ofld_set_sg_inline(struct nvme_tcp_ofld_queue *queue, + struct nvme_command *c, u32 data_len) +{ + struct nvme_sgl_desc *sg = &c->common.dptr.sgl; + + sg->addr = cpu_to_le64(queue->ctrl->nctrl.icdoff); + sg->length = cpu_to_le32(data_len); + sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET; +} + +void nvme_tcp_ofld_map_data(struct nvme_command *c, u32 data_len) +{ + struct nvme_sgl_desc *sg = &c->common.dptr.sgl; + + sg->addr = 0; + sg->length = cpu_to_le32(data_len); + sg->type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A; +} + static void nvme_tcp_ofld_submit_async_event(struct nvme_ctrl *arg) { /* Placeholder - submit_async_event */ @@ -855,9 +886,12 @@ nvme_tcp_ofld_init_request(struct blk_mq_tag_set *set, { struct nvme_tcp_ofld_req *req = blk_mq_rq_to_pdu(rq); struct nvme_tcp_ofld_ctrl *ctrl = set->driver_data; + int qid; - /* Placeholder - init request */ - + qid = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0; + req->queue = &ctrl->queues[qid]; + nvme_req(rq)->ctrl = &ctrl->nctrl; + nvme_req(rq)->cmd = &req->nvme_cmd; req->done = nvme_tcp_ofld_req_done; ctrl->dev->ops->init_req(req); @@ -872,16 +906,60 @@ EXPORT_SYMBOL_GPL(nvme_tcp_ofld_inline_data_size); static void nvme_tcp_ofld_commit_rqs(struct blk_mq_hw_ctx *hctx) { - /* Call ops->commit_rqs */ + struct nvme_tcp_ofld_queue *queue = hctx->driver_data; + struct nvme_tcp_ofld_dev *dev = queue->dev; + struct nvme_tcp_ofld_ops *ops = dev->ops; + + ops->commit_rqs(queue); } static blk_status_t nvme_tcp_ofld_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { - /* Call nvme_setup_cmd(...) */ + struct nvme_tcp_ofld_req *req = blk_mq_rq_to_pdu(bd->rq); + struct nvme_tcp_ofld_queue *queue = hctx->driver_data; + struct nvme_tcp_ofld_ctrl *ctrl = queue->ctrl; + struct nvme_ns *ns = hctx->queue->queuedata; + struct nvme_tcp_ofld_dev *dev = queue->dev; + struct nvme_tcp_ofld_ops *ops = dev->ops; + struct nvme_command *nvme_cmd; + struct request *rq; + bool queue_ready; + u32 data_len; + int rc; + + queue_ready = test_bit(NVME_TCP_OFLD_Q_LIVE, &queue->flags); + + req->rq = bd->rq; + req->async = false; + rq = req->rq; + + if (!nvme_check_ready(&ctrl->nctrl, req->rq, queue_ready)) + return nvme_fail_nonready_command(&ctrl->nctrl, req->rq); + + rc = nvme_setup_cmd(ns, req->rq); + if (unlikely(rc)) + return rc; - /* Call ops->send_req(...) */ + blk_mq_start_request(req->rq); + req->last = bd->last; + + nvme_cmd = &req->nvme_cmd; + nvme_cmd->common.flags |= NVME_CMD_SGL_METABUF; + + data_len = blk_rq_nr_phys_segments(rq) ? blk_rq_payload_bytes(rq) : 0; + if (!data_len) + nvme_tcp_ofld_set_sg_null(&req->nvme_cmd); + else if ((rq_data_dir(rq) == WRITE) && + data_len <= nvme_tcp_ofld_inline_data_size(queue)) + nvme_tcp_ofld_set_sg_inline(queue, nvme_cmd, data_len); + else + nvme_tcp_ofld_map_data(nvme_cmd, data_len); + + rc = ops->send_req(req); + if (unlikely(rc)) + return rc; return BLK_STS_OK; } @@ -954,9 +1032,11 @@ static int nvme_tcp_ofld_map_queues(struct blk_mq_tag_set *set) static int nvme_tcp_ofld_poll(struct blk_mq_hw_ctx *hctx) { - /* Placeholder - Implement polling mechanism */ + struct nvme_tcp_ofld_queue *queue = hctx->driver_data; + struct nvme_tcp_ofld_dev *dev = queue->dev; + struct nvme_tcp_ofld_ops *ops = dev->ops; - return 0; + return ops->poll_queue(queue); } static struct blk_mq_ops nvme_tcp_ofld_mq_ops = {