netdev - Re: [net-next v5 1/6] net: marvell: prestera: Add driver for Prestera family ASIC devices

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Message-ID: <20200826130441.GR2403519@lunn.ch>
Date:   Wed, 26 Aug 2020 15:04:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     David Miller <davem@...emloft.net>, kuba@...nel.org,
        jiri@...lanox.com, idosch@...lanox.com,
        oleksandr.mazur@...ision.eu, serhiy.boiko@...ision.eu,
        serhiy.pshyk@...ision.eu, volodymyr.mytnyk@...ision.eu,
        taras.chornyi@...ision.eu, andrii.savka@...ision.eu,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        andy.shevchenko@...il.com, mickeyr@...vell.com
Subject: Re: [net-next v5 1/6] net: marvell: prestera: Add driver for
 Prestera family ASIC devices

> There is a limitation on the DMA range. Current device can't handle
> whole ZONE_DMA range, so there is a "backup" mechanism which copies the
> entire packet if the mapping was failed or if the packet's mapped
> address is out of this range, this is done on both rx and tx directions.

If you use the DMA API correct, it should hide all this, and do the
bounce buffers for you. But i'm no DMA expert...

       Andrew