netdev - Re: [PATCH net-next V2 1/7] net/mlx5e: Implement Fragmented Work Queue (WQ)

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Date:   Wed, 30 Nov 2016 18:26:56 +0100 (CET)
From:   Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Roi Dayan <roid@...lanox.com>
Subject: Re: [PATCH net-next V2 1/7] net/mlx5e: Implement Fragmented Work
 Queue (WQ)

Hi,

On Wed, 30 Nov 2016, Saeed Mahameed wrote:
> From: Tariq Toukan <tariqt@...lanox.com>
> 
> Add new type of struct mlx5_frag_buf which is used to allocate fragmented
> buffers rather than contiguous, and make the Completion Queues (CQs) use
> it as they are big (default of 2MB per CQ in Striding RQ).
> 
> This fixes the failures of type:
> "mlx5e_open_locked: mlx5e_open_channels failed, -12"
> due to dma_zalloc_coherent insufficient contiguous coherent memory to
> satisfy the driver's request when the user tries to setup more or larger
> rings.

Thanks for that patch! I can confirm that this fixes the lage allocation
issue.

Regards,
Sebastian