Messages in this thread | | | Date | Wed, 18 May 2022 13:05:25 -0300 | From | Jason Gunthorpe <> | Subject | Re: [EXTERNAL] Re: [PATCH 05/12] net: mana: Set the DMA device max page size |
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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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