netdev - NAPI documentation needed

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Message-ID: <CACna6rzG3KcMYUpMZv-wv6e62J9j1NLuZpTRSQHLpyfTTbKyUg@mail.gmail.com>
Date:	Thu, 20 Dec 2012 20:39:02 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>
Subject: NAPI documentation needed

I wanted to report some problem I've encouraged during bgmac driver development.

At the very beginning I've implemented IRQ using threaded IRQ
(request_threaded_irq). I didn't know about NAPI until someone pointed
me that mistake. So I decided to rewrite IRQs handling to use NAPI.
I've found following documents:
http://www.linuxfoundation.org/collaborate/workgroups/networking/napi
ftp://robur.slu.se/pub/Linux/net-development/NAPI/README
ftp://robur.slu.se/pub/Linux/net-development/NAPI/NAPI_HOWTO.txt
ftp://robur.slu.se/pub/Linux/net-development/NAPI/converting-to-NAPI.txt~
but nothing really official sitting in kernel's Documentation dir.

So I started to using found documents, but then noticed they are quite outdated.

1) We don't have netif_rx_schedule and netif_rx_complete anymore.
2) We don't set poll and weight manually anymore but use netif_napi_add
3) Return type and arguments has changed in poll. None of the
following is up-to-date:
static void my_poll (struct net_device *dev, int *budget)
int (*poll)(struct net_device *dev, int *budget);

It would be great if someone with NAPI knowledge could document it in
a kernel. Would be really helpful for new network drivers developers.

-- 
Rafał
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