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Subject: Re: [PATCH rdma-next 01/10] RDMA: Add access flags to ib_alloc_mr()
 and ib_mr_pool_init()
To:     Leon Romanovsky <leon@kernel.org>,
        Doug Ledford <dledford@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Christoph Hellwig <hch@lst.de>
Cc:     Avihai Horon <avihaih@nvidia.com>,
        Adit Ranadive <aditr@vmware.com>,
        Anna Schumaker <anna.schumaker@netapp.com>,
        Ariel Elior <aelior@marvell.com>,
        Bernard Metzler <bmt@zurich.ibm.com>,
        Christoph Hellwig <hch@lst.de>,
        Chuck Lever <chuck.lever@oracle.com>,
        "David S. Miller" <davem@davemloft.net>,
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        Faisal Latif <faisal.latif@intel.com>,
        Jack Wang <jinpu.wang@ionos.com>,
        Jakub Kicinski <kuba@kernel.org>,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Jens Axboe <axboe@fb.com>,
        Karsten Graul <kgraul@linux.ibm.com>,
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References: <20210405052404.213889-1-leon@kernel.org>
 <20210405052404.213889-2-leon@kernel.org>
From:   Bart Van Assche <bvanassche@acm.org>
Message-ID: <c21edd64-396c-4c7c-86f8-79045321a528@acm.org>
Date:   Mon, 5 Apr 2021 08:27:16 -0700
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On 4/4/21 10:23 PM, Leon Romanovsky wrote:
> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> index bed4cfe50554..59138174affa 100644
> --- a/include/rdma/ib_verbs.h
> +++ b/include/rdma/ib_verbs.h
> @@ -2444,10 +2444,10 @@ struct ib_device_ops {
>  				       struct ib_udata *udata);
>  	int (*dereg_mr)(struct ib_mr *mr, struct ib_udata *udata);
>  	struct ib_mr *(*alloc_mr)(struct ib_pd *pd, enum ib_mr_type mr_type,
> -				  u32 max_num_sg);
> +				  u32 max_num_sg, u32 access);
>  	struct ib_mr *(*alloc_mr_integrity)(struct ib_pd *pd,
>  					    u32 max_num_data_sg,
> -					    u32 max_num_meta_sg);
> +					    u32 max_num_meta_sg, u32 access);
>  	int (*advise_mr)(struct ib_pd *pd,
>  			 enum ib_uverbs_advise_mr_advice advice, u32 flags,
>  			 struct ib_sge *sg_list, u32 num_sge,
> @@ -4142,11 +4142,10 @@ static inline int ib_dereg_mr(struct ib_mr *mr)
>  }
>  
>  struct ib_mr *ib_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
> -			  u32 max_num_sg);
> +			  u32 max_num_sg, u32 access);
>  
> -struct ib_mr *ib_alloc_mr_integrity(struct ib_pd *pd,
> -				    u32 max_num_data_sg,
> -				    u32 max_num_meta_sg);
> +struct ib_mr *ib_alloc_mr_integrity(struct ib_pd *pd, u32 max_num_data_sg,
> +				    u32 max_num_meta_sg, u32 access);
>  
>  /**
>   * ib_update_fast_reg_key - updates the key portion of the fast_reg MR
> diff --git a/include/rdma/mr_pool.h b/include/rdma/mr_pool.h
> index e77123bcb43b..2a0ee791037d 100644
> --- a/include/rdma/mr_pool.h
> +++ b/include/rdma/mr_pool.h
> @@ -11,7 +11,8 @@ struct ib_mr *ib_mr_pool_get(struct ib_qp *qp, struct list_head *list);
>  void ib_mr_pool_put(struct ib_qp *qp, struct list_head *list, struct ib_mr *mr);
>  
>  int ib_mr_pool_init(struct ib_qp *qp, struct list_head *list, int nr,
> -		enum ib_mr_type type, u32 max_num_sg, u32 max_num_meta_sg);
> +		    enum ib_mr_type type, u32 max_num_sg, u32 max_num_meta_sg,
> +		    u32 access);
>  void ib_mr_pool_destroy(struct ib_qp *qp, struct list_head *list);
>  
>  #endif /* _RDMA_MR_POOL_H */

Does the new 'access' argument only control whether or not PCIe relaxed
ordering is enabled? It seems wrong to me to make enabling of PCIe
relaxed ordering configurable. I think this mechanism should be enabled
unconditionally if the HCA supports it.

Thanks,

Bart.