netdev - Re: [net-next, PATCH 1/2] net: socionext: different approach on DMA

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Date:   Thu, 08 Nov 2018 19:42:59 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     ilias.apalodimas@...aro.org
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, masami.hiramatsu@...aro.org,
        masahisa.kojima@...aro.org, brouer@...hat.com, arnd@...db.de
Subject: Re: [net-next, PATCH 1/2] net: socionext: different approach on DMA

From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Date: Thu,  8 Nov 2018 17:19:54 +0200

> Current driver dynamically allocates an skb and maps it as DMA Rx
> buffer. In order to prepare for upcoming XDP changes, let's introduce a
> different allocation scheme.
> Buffers are allocated dynamically and mapped into hardware.
> During the Rx operation the driver uses build_skb() to produce the
> necessary buffers for the network stack.
> This change increases performance ~15% on 64b packets with smmu disabled
> and ~5% with smmu enabled
> 
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>

Applied.