netdev - NAPI of many interfaces with just an interruption source

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Message-ID: <b0438a630902201033l395edc7ck4a2749e239797445@mail.gmail.com>
Date:	Fri, 20 Feb 2009 19:33:23 +0100
From:	Miguel Ángel Álvarez <gotzoncabanes@...il.com>
To:	netdev@...r.kernel.org,
	Miguel Ángel Álvarez <gotzoncabanes@...il.com>
Subject: NAPI of many interfaces with just an interruption source

Hi

I have four interfaces that share the same interruption source (four
hdlc channels in ixp4xx that share the same rx queue... but I am
trying to do the question generic).

My first approach was to declare a napi interface for each device.
When I detected the first interrupt, I determine the correct net
interface, and schedule a poll for it.

The question is that there is no warranty that the data received in
the polling belongs to the same interface, so...

- It is correct to do like this, and just analyse the data to check to
which net interface should the data be sent.
- Or NAPI is not correct for this case and we should just use the
simple interruption mechanism?

Thanks

Miguel Ángel Álvarez
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