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SubjectRe: [PATCH V2] net: ethernet: mellanox: correct page conversion
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Apologies,

Replied to an older post by mistake. I was trying to reply to Eran.

>Hi Sinan,
>
>We are working in Mellanox for a solution which
>removes the vmap call and allocate contiguous memory (using dma_alloc_coherent).
>
>Thanks,
>Eran
>
>
>On 4/20/2016 9:35 AM, Sinan Kaya wrote:
> On 4/19/2016 2:22 PM, Christoph Hellwig wrote:
>> What I think we need is something like the patch below. In the long
>> ru nwe should also kill the mlx4_buf structure which now is pretty
>> pointless.
>>
>

It is been 1.5 years since I reported the problem. We came up with three
different solutions this week. I'd like to see a version of the solution
to get merged until Mellanox comes up with a better solution with another
patch. My proposal is to use this one.

>
> -- a/drivers/net/ethernet/mellanox/mlx4/alloc.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/alloc.c
> @@ -588,7 +588,7 @@ int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct,
> {
> dma_addr_t t;
>
> - if (size <= max_direct) {
> + if ((size <= max_direct) || (BITS_PER_LONG == 64)){
> buf->nbufs = 1;
> buf->npages = 1;
> buf->page_shift = get_order(size) + PAGE_SHIFT;
>
> Of course, this is assuming that you are not ready to submit your patch yet. If you
> are, feel free to post.
>


--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

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