netdev - Re: [PATCH for bnxt_re V4 10/21] RDMA/bnxt

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Date:   Wed, 18 Jan 2017 10:19:15 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Selvin Xavier <selvin.xavier@...adcom.com>
Cc:     dledford@...hat.com, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, michael.chan@...adcom.com,
        Eddie Wai <eddie.wai@...adcom.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>
Subject: Re: [PATCH for bnxt_re V4 10/21] RDMA/bnxt_re: Support for CQ verbs

On Wed, Dec 21, 2016 at 03:41:59AM -0800, Selvin Xavier wrote:
> Implements support for create_cq, destroy_cq and req_notify_cq
> verbs.
>
> v3: Code cleanup based on errors reported by sparse on endianness check.
>     Removes unwanted macros.
>
> Signed-off-by: Eddie Wai <eddie.wai@...adcom.com>
> Signed-off-by: Devesh Sharma <devesh.sharma@...adcom.com>
> Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
> Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>
> Signed-off-by: Selvin Xavier <selvin.xavier@...adcom.com>
> ---
>  drivers/infiniband/hw/bnxt_re/ib_verbs.c | 146 +++++++++++++++++++++++++
>  drivers/infiniband/hw/bnxt_re/ib_verbs.h |  19 ++++
>  drivers/infiniband/hw/bnxt_re/main.c     |   4 +
>  drivers/infiniband/hw/bnxt_re/qplib_fp.c | 181 +++++++++++++++++++++++++++++++
>  drivers/infiniband/hw/bnxt_re/qplib_fp.h |  50 +++++++++
>  include/uapi/rdma/bnxt_re-abi.h          |  12 ++
>  6 files changed, 412 insertions(+)
>
> diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> index b09c2cb..e12e0c2 100644
> --- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> +++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> @@ -492,6 +492,152 @@ struct ib_pd *bnxt_re_alloc_pd(struct ib_device *ibdev,
>  	return ERR_PTR(rc);
>  }
>
> +/* Completion Queues */
> +int bnxt_re_destroy_cq(struct ib_cq *ib_cq)
> +{
> +	struct bnxt_re_cq *cq = container_of(ib_cq, struct bnxt_re_cq, ib_cq);
> +	struct bnxt_re_dev *rdev = cq->rdev;
> +	int rc;
> +
> +	rc = bnxt_qplib_destroy_cq(&rdev->qplib_res, &cq->qplib_cq);
> +	if (rc) {
> +		dev_err(rdev_to_dev(rdev), "Failed to destroy HW CQ");
> +		return rc;
> +	}
> +	if (cq->umem && !IS_ERR(cq->umem))
> +		ib_umem_release(cq->umem);
> +
> +	if (cq) {
> +		kfree(cq->cql);
> +		kfree(cq);
> +	}
> +	atomic_dec(&rdev->cq_count);
> +	rdev->nq.budget--;
> +	return 0;
> +}
> +
> +struct ib_cq *bnxt_re_create_cq(struct ib_device *ibdev,
> +				const struct ib_cq_init_attr *attr,
> +				struct ib_ucontext *context,
> +				struct ib_udata *udata)
> +{
> +	struct bnxt_re_dev *rdev = to_bnxt_re_dev(ibdev, ibdev);
> +	struct bnxt_qplib_dev_attr *dev_attr = &rdev->dev_attr;
> +	struct bnxt_re_cq *cq = NULL;
> +	int rc, entries;
> +	int cqe = attr->cqe;
> +
> +	/* Validate CQ fields */
> +	if (cqe < 1 || cqe > dev_attr->max_cq_wqes) {
> +		dev_err(rdev_to_dev(rdev), "Failed to create CQ -max exceeded");
> +		return ERR_PTR(-EINVAL);
> +	}
> +	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
> +	if (!cq)
> +		return ERR_PTR(-ENOMEM);
> +
> +	cq->rdev = rdev;
> +	cq->qplib_cq.cq_handle = (u64)(unsigned long)(&cq->qplib_cq);
> +
> +	entries = roundup_pow_of_two(cqe + 1);
> +	if (entries > dev_attr->max_cq_wqes + 1)
> +		entries = dev_attr->max_cq_wqes + 1;
> +
> +	if (context) {
> +		struct bnxt_re_cq_req req;
> +		struct bnxt_re_ucontext *uctx = container_of
> +						(context,
> +						 struct bnxt_re_ucontext,
> +						 ib_uctx);
> +		if (ib_copy_from_udata(&req, udata, sizeof(req))) {
> +			rc = -EFAULT;
> +			goto fail;
> +		}
> +
> +		cq->umem = ib_umem_get(context, req.cq_va,
> +				       entries * sizeof(struct cq_base),
> +				       IB_ACCESS_LOCAL_WRITE, 1);
> +		if (IS_ERR(cq->umem)) {
> +			rc = PTR_ERR(cq->umem);
> +			goto fail;
> +		}
> +		cq->qplib_cq.sghead = cq->umem->sg_head.sgl;
> +		cq->qplib_cq.nmap = cq->umem->nmap;
> +		cq->qplib_cq.dpi = uctx->dpi;
> +	} else {
> +		cq->max_cql = entries > MAX_CQL_PER_POLL ? MAX_CQL_PER_POLL :
> +					entries;

It is better to use already existing macros - min()
cq->max_cql = min(entries, MAX_CQL_PER_POLL);

I afraid that you can't avoid the respinning, you have more than month
till merge window.

Can you please remove useless wrappers and try to reuse kernel macros?

Thanks

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