netdev - Re: [PATCH] Packet socket: mmapped IO: PACKET_TX

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Date:	Tue, 11 Nov 2008 13:10:34 +0100
From:	"Johann Baudy" <johaahn@...il.com>
To:	"Lovich, Vitali" <vlovich@...lcomm.com>
Cc:	"Evgeniy Polyakov" <zbr@...emap.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] Packet socket: mmapped IO: PACKET_TX_RING

Hi Vitali,

> Found another issue.  I'm not sure how your code managed to work, but in my patch I had to have skb_reset_network_header(skb) after a skb_reserve - otherwise, it would be rejected when I passed it on to the device.

That's not an issue with my device.
It is called in original packet_sendmsg(). I've missed it :)

>
> Also, there's no need to support both header versions in the tx path - since v2 should be used anyways and there's no legacy (v1 headers are deprecated no?), we can use v2 only in the tx path.

I think we have either to use our own TX header (we are using only
status field of V2) or to keep compatibility with all RX/TX headers
available.
Be compatible with V1/V2 makes TX code more flexible if there is a V3
in the future.

> Additionally, if the packet size is too long, the kernel has a responsibility to clear that flag (otherwise that slot will never free up).
I'm not sure to understand, could you please clarify ?

Thanks,
Johann
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