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Message-ID: <CAKKgK4wYzD+8vk2Uty8LQSnOpvBPhf2-zeoQ=T+nU_Ls4Dv+3Q@mail.gmail.com>
Date: Tue, 4 May 2021 19:34:37 +0300
From: Shai Malin <malin1024@...il.com>
To: Hannes Reinecke <hare@...e.de>
Cc: Shai Malin <smalin@...vell.com>, netdev@...r.kernel.org,
linux-nvme@...ts.infradead.org, davem@...emloft.net,
kuba@...nel.org, sagi@...mberg.me, hch@....de, axboe@...com,
kbusch@...nel.org, Ariel Elior <aelior@...vell.com>,
Michal Kalderon <mkalderon@...vell.com>, okulkarni@...vell.com,
pkushwaha@...vell.com, Dean Balandin <dbalandin@...vell.com>
Subject: Re: [RFC PATCH v4 14/27] nvme-tcp-offload: Add IO level implementation
On 5/1/21 7:38 PM, Hannes Reinecke wrote:
> On 4/29/21 9:09 PM, Shai Malin wrote:
> > From: Dean Balandin <dbalandin@...vell.com>
> >
> > 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 compilation.
>
> Request compilation? Not request completion?
Completion. Thanks!
>
> > 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 <irusskikh@...vell.com>
> > Signed-off-by: Dean Balandin <dbalandin@...vell.com>
> > Signed-off-by: Prabhakar Kushwaha <pkushwaha@...vell.com>
> > Signed-off-by: Omkar Kulkarni <okulkarni@...vell.com>
> > Signed-off-by: Michal Kalderon <mkalderon@...vell.com>
> > Signed-off-by: Ariel Elior <aelior@...vell.com>
> > Signed-off-by: Shai Malin <smalin@...vell.com>
> > ---
> > drivers/nvme/host/tcp-offload.c | 95 ++++++++++++++++++++++++++++++---
> > 1 file changed, 87 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/nvme/host/tcp-offload.c b/drivers/nvme/host/tcp-offload.c
> > index 8ddce2257100..0cdf5a432208 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 *
> > @@ -686,6 +689,34 @@ 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 */
> > @@ -841,9 +872,11 @@ 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;
> > req->done = nvme_tcp_ofld_req_done;
> > ctrl->dev->ops->init_req(req);
> >
> > @@ -858,16 +891,60 @@ 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 (!nvmf_check_ready(&ctrl->nctrl, req->rq, queue_ready))
> > + return nvmf_fail_nonready_command(&ctrl->nctrl, req->rq);
> > +
> > + rc = nvme_setup_cmd(ns, req->rq, &req->nvme_cmd);
> > + 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;
> > }
> > @@ -940,9 +1017,11 @@ 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 = {
> >
> Reviewed-by: Hannes Reinecke <hare@...e.de>
>
Thanks.
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke Kernel Storage Architect
> hare@...e.de +49 911 74053 688
> SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
> HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
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