netdev - Re: [PATCH mlx5-next 09/10] net/rds: Handle ODP mr registration/unregistration

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Date:   Wed, 15 Jan 2020 13:51:23 -0800
From:   santosh.shilimkar@...cle.com
To:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Hans Westgaard Ry <hans.westgaard.ry@...cle.com>,
        Moni Shoua <monis@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH mlx5-next 09/10] net/rds: Handle ODP mr
 registration/unregistration

On 1/15/20 4:43 AM, Leon Romanovsky wrote:
> From: Hans Westgaard Ry <hans.westgaard.ry@...cle.com>
> 
> On-Demand-Paging MRs are registered using ib_reg_user_mr and
> unregistered with ib_dereg_mr.
> 
> Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@...cle.com>
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
> ---

Have already reviewed this patchset on internal list. Couple of
minor nits below o.w patch looks good to me.

Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>

[...]

> diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
> index c8c1e3ae8d84..5a02b313ec50 100644
> --- a/net/rds/ib_rdma.c
> +++ b/net/rds/ib_rdma.c
> @@ -37,8 +37,15 @@
> 
>   #include "rds_single_path.h"
>   #include "ib_mr.h"
> +#include "rds.h"
> 
>   struct workqueue_struct *rds_ib_mr_wq;
> +struct rds_ib_dereg_odp_mr {
> +	struct work_struct work;
> +	struct ib_mr *mr;
> +};
> +
> +static void rds_ib_odp_mr_worker(struct work_struct *work);
> 
>   static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr)
>   {
> @@ -213,6 +220,8 @@ void rds_ib_sync_mr(void *trans_private, int direction)
>   	struct rds_ib_mr *ibmr = trans_private;
>   	struct rds_ib_device *rds_ibdev = ibmr->device;
> 
> +	if (ibmr->odp)
> +		return;
Add a new line here.
>   	switch (direction) {
>   	case DMA_FROM_DEVICE:
>   		ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg,

[...]

> diff --git a/net/rds/rdma.c b/net/rds/rdma.c
> index eb23c38ce2b3..3c6afdda709b 100644
> --- a/net/rds/rdma.c
> +++ b/net/rds/rdma.c
> @@ -177,13 +177,14 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
>   			  struct rds_conn_path *cp)
>   {
>   	struct rds_mr *mr = NULL, *found;
> +	struct scatterlist *sg = NULL;
>   	unsigned int nr_pages;
>   	struct page **pages = NULL;
> -	struct scatterlist *sg;
>   	void *trans_private;
>   	unsigned long flags;
>   	rds_rdma_cookie_t cookie;
> -	unsigned int nents;
> +	unsigned int nents = 0;
> +	int need_odp = 0;
>   	long i;
>   	int ret;
> 
> @@ -196,6 +197,20 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
>   		ret = -EOPNOTSUPP;
>   		goto out;
>   	}
New line pls