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Message-ID:
<PH7PR21MB326394A06EF49FF286D57B63CE442@PH7PR21MB3263.namprd21.prod.outlook.com>
Date: Thu, 8 Feb 2024 18:42:51 +0000
From: Long Li <longli@...rosoft.com>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>, Konstantin Taranov
<kotaranov@...rosoft.com>, "sharmaajay@...rosoft.com"
<sharmaajay@...rosoft.com>, "jgg@...pe.ca" <jgg@...pe.ca>, "leon@...nel.org"
<leon@...nel.org>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH rdma-next v1 1/1] RDMA/mana_ib: Fix bug in creation of dma
regions
>
> /* Hardware requires dma region to align to chosen page size */
> - page_sz = ib_umem_find_best_pgsz(umem, PAGE_SZ_BM, 0);
> + page_sz = ib_umem_find_best_pgsz(umem, PAGE_SZ_BM, virt);
> if (!page_sz) {
> ibdev_dbg(&dev->ib_dev, "failed to find page size.\n");
> return -ENOMEM;
> }
How about doing:
page_sz = ib_umem_find_best_pgsz(umem, PAGE_SZ_BM, force_zero_offset ? 0 : virt);
Will this work? This can get rid of the following while loop.
> +
> + if (force_zero_offset) {
> + while (ib_umem_dma_offset(umem, page_sz) && page_sz >
> PAGE_SIZE)
> + page_sz /= 2;
> + if (ib_umem_dma_offset(umem, page_sz) != 0) {
> + ibdev_dbg(&dev->ib_dev, "failed to find page size to
> force zero offset.\n");
> + return -ENOMEM;
> + }
> + }
> +
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