linux-kernel - Re: [PATCH v2 00/26] IB: Optimize DMA mapping

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Message-ID: <eb220182-6e02-2729-27ac-7ee402c808af@grimberg.me>
Date:   Fri, 13 Jan 2017 23:26:22 +0200
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Bart Van Assche <bart.vanassche@...disk.com>,
        Doug Ledford <dledford@...hat.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 00/26] IB: Optimize DMA mapping


> Hello Doug,
>
> As you know there are two sets of DMA mapping operations in the Linux
> kernel:
> - One set of DMA mapping operations that is used by most drivers.
> - Another set of DMA mapping operations that is only used by the RDMA
>   drivers.
> Having two sets of DMA mapping operations is not only a source of
> confusion but also a source of unnecessary overhead. The DMA mapping
> operations are in the hot path so it is important that the overhead
> of these operations is as low as possible. Hence this patch series
> that converts the RDMA code to the standard DMA mapping API and
> thereby eliminates the if (dev->dma_ops) test from the hot path. An
> additional benefit is that the size of HW and SW drivers that do not
> use DMA is reduced by switching to dma_virt_ops.

This looks really good!

Thanks Bart for doing this,

For the series:

Reviewed-by: Sagi Grimberg <sagi@...mberg.me>