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    SubjectRe: [EXTERNAL] Re: [PATCH 05/12] net: mana: Set the DMA device max page size
    On Wed, May 18, 2022 at 05:59:00AM +0000, Ajay Sharma wrote:
    > Thanks Long.
    > Hello Jason,
    > I am the author of the patch.
    > To your comment below :
    > " As I've already said, you are supposed to set the value that limits to ib_sge and *NOT* the value that is related to ib_umem_find_best_pgsz. It is usually 2G because the ib_sge's typically work on a 32 bit length."
    >
    > The ib_sge is limited by the __sg_alloc_table_from_pages() which
    > uses ib_dma_max_seg_size() which is what is set by the eth driver
    > using dma_set_max_seg_size() . Currently our hw does not support
    > PTEs larger than 2M.

    *sigh* again it has nothing to do with *PTEs* in the HW.

    Jason

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