netdev - Single packet receiving in multiple ring buffers

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Message-ID: <a967d7d00805211835q241f8edai6253659330b8e6cf@mail.gmail.com>
Date:	Wed, 21 May 2008 18:35:18 -0700
From:	"Keyur Chudgar" <kchudgar.linux@...il.com>
To:	netdev@...r.kernel.org
Subject: Single packet receiving in multiple ring buffers

Hi,

I have a question regarding packets received in multiple ring buffers
from hw interface,
if the packet size is larger than the ring buffer size.

The way generally I saw this is done is,
1. Initially allocate skb with MTU size and configure ring buffer
2. If packet comes in multiple ring buffers, they copy these buffers
and make a new single
skb out of it
3. Send a single skb to netif_rx

The point 2 above can be done either using memcpy or DMA. But in any
case, we need a copy.

Does anybody know, if there is a way, we can avoid the copy operation
while a single packet
received in multiple ring buffers?

Thanks,
- Keyur
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