netdev - DMA allocation driver defined limit?

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Message-ID: <CALZVapkJZotCxzMbGhZfvVV3G8W2z5tehEe7BaTjps620M+-Mw@mail.gmail.com>
Date:	Wed, 24 Apr 2013 20:18:12 +0200
From:	Javier Domingo <javierdo1@...il.com>
To:	netdev@...r.kernel.org
Subject: DMA allocation driver defined limit?

Hi,

I am trying to find how big can the DMA memory be, as I haven't found
anything in the docs that describes exactly a general size of DMA
allocation, I have supposed that it depends entirely on the card.

As a general approach, is it alright to suppose that the DMA memory
will be as big as the internal memory of the network card?

The real question here is, when using DMA, the driver has a limit of
packet size or a limit of sk_buffs it can receive? For me is like
there should be a size limit (althought I suppose there can't be
unlimited skbuffs).

Thanks for your attention and looking back for a replay,

Javier Domingo
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