From: Jason Gunthorpe <jgg@nvidia.com>
To: Adit Ranadive <aditr@vmware.com>,
Potnuri Bharat Teja <bharat@chelsio.com>,
Doug Ledford <dledford@redhat.com>,
Leon Romanovsky <leon@kernel.org>, <linux-rdma@vger.kernel.org>,
VMware PV-Drivers <pv-drivers@vmware.com>
Subject: Re: [PATCH 06/14] RDMA/umem: Split ib_umem_num_pages() into ib_umem_num_dma_blocks()
Date: Fri, 4 Sep 2020 19:32:56 -0300 [thread overview]
Message-ID: <20200904223256.GA455005@nvidia.com> (raw)
In-Reply-To: <6-v1-00f59ce24f1f+19f50-umem_1_jgg@nvidia.com>
On Tue, Sep 01, 2020 at 09:43:34PM -0300, Jason Gunthorpe wrote:
> diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
> index b880512ba95f16..ba3b9be0d8c56a 100644
> +++ b/include/rdma/ib_umem.h
> @@ -33,11 +33,17 @@ static inline int ib_umem_offset(struct ib_umem *umem)
> return umem->address & ~PAGE_MASK;
> }
>
> +static inline size_t ib_umem_num_dma_blocks(struct ib_umem *umem,
> + unsigned long pgsz)
> +{
> + return (ALIGN(umem->address + umem->length, pgsz) -
> + ALIGN_DOWN(umem->address, pgsz)) /
> + pgsz;
> +}
Like the other places, this is wrong as well. The IOVA needs to be
used here or it can be +-1 page away from what
rdma_umem_for_each_dma_block() returns.
However, it does work if pgsz is PAGE_SIZE, or for the very common
cases where umem->address == IOVA...
Which, I suppose, is why nobody noticed this until now, as I found
several drivers open coding the above.
Jason
next prev parent reply other threads:[~2020-09-04 22:33 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 0:43 [PATCH 00/14] RDMA: Improve use of umem in DMA drivers Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 01/14] RDMA/umem: Fix ib_umem_find_best_pgsz() for mappings that cross a page boundary Jason Gunthorpe
2020-09-02 9:24 ` Leon Romanovsky
2020-09-03 14:11 ` Saleem, Shiraz
2020-09-04 22:30 ` Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 02/14] RDMA/umem: Prevent small pages from being returned by ib_umem_find_best_pgsz() Jason Gunthorpe
2020-09-02 11:51 ` Leon Romanovsky
2020-09-02 11:59 ` Jason Gunthorpe
2020-09-02 12:05 ` Leon Romanovsky
2020-09-02 16:34 ` Jason Gunthorpe
2020-09-03 14:11 ` Saleem, Shiraz
2020-09-03 14:17 ` Jason Gunthorpe
2020-09-03 14:18 ` Saleem, Shiraz
2020-09-02 0:43 ` [PATCH 03/14] RDMA/umem: Use simpler logic for ib_umem_find_best_pgsz() Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 04/14] RDMA/umem: Add rdma_umem_for_each_dma_block() Jason Gunthorpe
2020-09-02 3:10 ` Miguel Ojeda
2020-09-03 14:12 ` Saleem, Shiraz
2020-09-02 0:43 ` [PATCH 05/14] RDMA/umem: Replace for_each_sg_dma_page with rdma_umem_for_each_dma_block Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 06/14] RDMA/umem: Split ib_umem_num_pages() into ib_umem_num_dma_blocks() Jason Gunthorpe
2020-09-03 14:12 ` Saleem, Shiraz
2020-09-03 14:14 ` Jason Gunthorpe
2020-09-04 22:32 ` Jason Gunthorpe [this message]
2020-09-02 0:43 ` [PATCH 07/14] RDMA/qedr: Use rdma_umem_for_each_dma_block() instead of open-coding Jason Gunthorpe
2020-09-02 15:36 ` [EXT] " Michal Kalderon
2020-09-02 18:44 ` Jason Gunthorpe
2020-09-02 19:53 ` Michal Kalderon
2020-09-02 0:43 ` [PATCH 08/14] RDMA/qedr: Use ib_umem_num_dma_blocks() instead of ib_umem_page_count() Jason Gunthorpe
2020-09-02 15:35 ` [EXT] " Michal Kalderon
2020-09-02 0:43 ` [PATCH 09/14] RDMA/bnxt: Do not use ib_umem_page_count() or ib_umem_num_pages() Jason Gunthorpe
2020-09-03 4:41 ` Selvin Xavier
2020-09-02 0:43 ` [PATCH 10/14] RDMA/hns: Use ib_umem_num_dma_blocks() instead of opencoding Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 11/14] RDMA/ocrdma: Use ib_umem_num_dma_blocks() instead of ib_umem_page_count() Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 12/14] RDMA/pvrdma: " Jason Gunthorpe
2020-09-02 0:43 ` [PATCH 13/14] RDMA/mlx5: Use ib_umem_num_dma_blocks() Jason Gunthorpe
2020-09-02 9:07 ` Gal Pressman
2020-09-03 15:14 ` Saleem, Shiraz
2020-09-02 0:43 ` [PATCH 14/14] RDMA/umem: Rename ib_umem_offset() to ib_umem_dma_offset() Jason Gunthorpe
2020-09-02 0:51 ` Zhu Yanjun
2020-09-02 15:36 ` [EXT] " Michal Kalderon
2020-09-03 18:48 ` Jason Gunthorpe
2020-09-02 9:09 ` [PATCH 00/14] RDMA: Improve use of umem in DMA drivers Gal Pressman
2020-09-02 12:00 ` Jason Gunthorpe
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