netdev - Re: [PATCH v6 rdma-next 5/6] RDMA/qedr: Add doorbell overflow recovery support

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Date:   Thu, 25 Jul 2019 15:01:06 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Michal Kalderon <michal.kalderon@...vell.com>
Cc:     ariel.elior@...vell.com, dledford@...hat.com, galpress@...zon.com,
        linux-rdma@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH v6 rdma-next 5/6] RDMA/qedr: Add doorbell overflow
 recovery support

On Tue, Jul 09, 2019 at 05:17:34PM +0300, Michal Kalderon wrote:

> +static int qedr_init_user_db_rec(struct ib_udata *udata,
> +				 struct qedr_dev *dev, struct qedr_userq *q,
> +				 bool requires_db_rec)
> +{
> +	struct qedr_ucontext *uctx =
> +		rdma_udata_to_drv_context(udata, struct qedr_ucontext,
> +					  ibucontext);
> +
> +	/* Aborting for non doorbell userqueue (SRQ) or non-supporting lib */
> +	if (requires_db_rec == 0 || !uctx->db_rec)
> +		return 0;
> +
> +	/* Allocate a page for doorbell recovery, add to mmap ) */
> +	q->db_rec_data = (void *)get_zeroed_page(GFP_KERNEL);

I now think this needs to be GFP_USER and our other drivers have a bug
here as well..

Jason