netdev - RE: [EXT] [PATCH v2 16/17] RDMA/qedr: Remove fbo and zbva from the MR

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Date:   Sun, 6 Sep 2020 08:01:39 +0000
From:   Michal Kalderon <mkalderon@...vell.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Ariel Elior <aelior@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        GR-everest-linux-l2 <GR-everest-linux-l2@...vell.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [EXT] [PATCH v2 16/17] RDMA/qedr: Remove fbo and zbva from the MR

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Saturday, September 5, 2020 1:42 AM
> zbva is always false, so fbo is never read.
> 
> A 'zero-based-virtual-address' is simply IOVA == 0, and the driver already
> supports this.
> 
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> ---
>  drivers/infiniband/hw/qedr/verbs.c         |  4 ----
>  drivers/net/ethernet/qlogic/qed/qed_rdma.c | 12 ++----------
>  include/linux/qed/qed_rdma_if.h            |  2 --
>  3 files changed, 2 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qedr/verbs.c
> b/drivers/infiniband/hw/qedr/verbs.c
> index 278b48443aedba..cca69b4ed354ea 100644
> --- a/drivers/infiniband/hw/qedr/verbs.c
> +++ b/drivers/infiniband/hw/qedr/verbs.c
> @@ -2878,10 +2878,8 @@ struct ib_mr *qedr_reg_user_mr(struct ib_pd
> *ibpd, u64 start, u64 len,
>  	mr->hw_mr.pbl_two_level = mr->info.pbl_info.two_layered;
>  	mr->hw_mr.pbl_page_size_log = ilog2(mr->info.pbl_info.pbl_size);
>  	mr->hw_mr.page_size_log = PAGE_SHIFT;
> -	mr->hw_mr.fbo = ib_umem_offset(mr->umem);
>  	mr->hw_mr.length = len;
>  	mr->hw_mr.vaddr = usr_addr;
> -	mr->hw_mr.zbva = false;
>  	mr->hw_mr.phy_mr = false;
>  	mr->hw_mr.dma_mr = false;
> 
> @@ -2974,10 +2972,8 @@ static struct qedr_mr *__qedr_alloc_mr(struct
> ib_pd *ibpd,
>  	mr->hw_mr.pbl_ptr = 0;
>  	mr->hw_mr.pbl_two_level = mr->info.pbl_info.two_layered;
>  	mr->hw_mr.pbl_page_size_log = ilog2(mr->info.pbl_info.pbl_size);
> -	mr->hw_mr.fbo = 0;
>  	mr->hw_mr.length = 0;
>  	mr->hw_mr.vaddr = 0;
> -	mr->hw_mr.zbva = false;
>  	mr->hw_mr.phy_mr = true;
>  	mr->hw_mr.dma_mr = false;
> 
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> index a4bcde522cdf9d..baa4c36608ea91 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> @@ -1520,7 +1520,7 @@ qed_rdma_register_tid(void *rdma_cxt,
>  		  params->pbl_two_level);
> 
>  	SET_FIELD(flags,
> RDMA_REGISTER_TID_RAMROD_DATA_ZERO_BASED,
> -		  params->zbva);
> +		  false);
> 
>  	SET_FIELD(flags, RDMA_REGISTER_TID_RAMROD_DATA_PHY_MR,
> params->phy_mr);
> 
> @@ -1582,15 +1582,7 @@ qed_rdma_register_tid(void *rdma_cxt,
>  	p_ramrod->pd = cpu_to_le16(params->pd);
>  	p_ramrod->length_hi = (u8)(params->length >> 32);
>  	p_ramrod->length_lo = DMA_LO_LE(params->length);
> -	if (params->zbva) {
> -		/* Lower 32 bits of the registered MR address.
> -		 * In case of zero based MR, will hold FBO
> -		 */
> -		p_ramrod->va.hi = 0;
> -		p_ramrod->va.lo = cpu_to_le32(params->fbo);
> -	} else {
> -		DMA_REGPAIR_LE(p_ramrod->va, params->vaddr);
> -	}
> +	DMA_REGPAIR_LE(p_ramrod->va, params->vaddr);
>  	DMA_REGPAIR_LE(p_ramrod->pbl_base, params->pbl_ptr);
> 
>  	/* DIF */
> diff --git a/include/linux/qed/qed_rdma_if.h
> b/include/linux/qed/qed_rdma_if.h index f464d85e88a410..aeb242cefebfa8
> 100644
> --- a/include/linux/qed/qed_rdma_if.h
> +++ b/include/linux/qed/qed_rdma_if.h
> @@ -242,10 +242,8 @@ struct qed_rdma_register_tid_in_params {
>  	bool pbl_two_level;
>  	u8 pbl_page_size_log;
>  	u8 page_size_log;
> -	u32 fbo;
>  	u64 length;
>  	u64 vaddr;
> -	bool zbva;
>  	bool phy_mr;
>  	bool dma_mr;
> 
> --
> 2.28.0

Thanks, 

Acked-by: Michal Kalderon <michal.kalderon@...vell.com>