linux-kernel - Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

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Date:	Wed, 20 Apr 2016 09:35:33 -0400
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-rdma@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, Yishai Hadas <yishaih@...lanox.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

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