netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <20090429091803.GA23463@ioremap.net>
Date:	Wed, 29 Apr 2009 13:18:03 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Johann Baudy <johann.baudy@...-log.net>
Cc:	netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH] TX_RING and packet mmap

On Sun, Apr 26, 2009 at 03:06:29PM +0200, Johann Baudy (johann.baudy@...-log.net) wrote:
> +++ Transmission process
> +Those defines are also used for transmission:
> +
> +     #define TP_STATUS_AVAILABLE        0 // Frame is available
> +     #define TP_STATUS_SEND_REQUEST     1 // Frame will be sent on next send()
> +     #define TP_STATUS_SENDING          2 // Frame is currently in transmission
> +     #define TP_STATUS_WRONG_FORMAT     4 // Frame format is not correct
> +
> +First, the kernel initializes all frames to TP_STATUS_AVAILABLE. To send a
> +packet, the user fills a data buffer of an available frame, sets tp_len to
> +current data buffer size and sets its status field to TP_STATUS_SEND_REQUEST.
> +This can be done on multiple frames. Once the user is ready to transmit, it
> +calls send(). Then all buffers with status equal to TP_STATUS_AVAILABLE are

I suppose kernel sends packets with the status field equal to
TP_STATUS_SEND_REQUEST not TP_STATUS_AVAILABLE.

Besides several codying style issues, like placing { on the new line
from the same one, missing space near the operator like if(smth),
switch(smth), things look good.

-- 
	Evgeniy Polyakov
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