linux-kernel - Re: [PATCH] net: don't use kvzalloc for DMA memory

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Date:   Wed, 18 Apr 2018 13:45:07 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     mpatocka@...hat.com, edumazet@...gle.com, joby.poriyath@...rix.com,
        bhutchings@...arflare.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: don't use kvzalloc for DMA memory

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 18 Apr 2018 09:05:54 -0700

> Each virtio_net should probably allocate the exact amount of
> DMA-memory it wants, instead of expecting core networking stack to
> have a huge chunk of DMA-memory for everything.

Yes, if you need DMA'able memory, allocate DMA'able memory separately
and hang it off of the netdev instead of assuming you can just DMA
in/out of it.