netdev - Re: [PATCH 03/10 net-next] net/mlx5e: RX, Internal DMA mapping in page

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Date:   Fri, 18 Oct 2019 13:04:24 -0700
From:   "Jonathan Lemon" <jonathan.lemon@...il.com>
To:     "Jakub Kicinski" <jakub.kicinski@...ronome.com>
Cc:     brouer@...hat.com, ilias.apalodimas@...aro.org,
        saeedm@...lanox.com, tariqt@...lanox.com, netdev@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 03/10 net-next] net/mlx5e: RX, Internal DMA mapping in
 page_pool

On 16 Oct 2019, at 18:33, Jakub Kicinski wrote:

> On Wed, 16 Oct 2019 15:50:21 -0700, Jonathan Lemon wrote:
>> From: Tariq Toukan <tariqt@...lanox.com>
>>
>> After RX page-cache is removed in previous patch, let the
>> page_pool be responsible for the DMA mapping.
>>
>> Issue: 1487631
>> Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
>>
>> Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
>
> IIUC you'll need to add DMA syncs here, no? map/unmap has syncing as
> side effect.

The driver still needs to do DMA sync for data transfers,
this only covers the initial mapping.
-- 
Jonathan