netdev - Re: [PATCH] net: phy: b53: switchdev driver for Broadcom BCM53xx switches

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Date:	Fri, 27 Feb 2015 17:21:04 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jiri@...nulli.us
Cc:	sfeldma@...il.com, gospo@...ulusnetworks.com, andrew@...n.ch,
	zajec5@...il.com, f.fainelli@...il.com, netdev@...r.kernel.org,
	jogo@...nwrt.org, hauke@...ke-m.de, nbd@...nwrt.org
Subject: Re: [PATCH] net: phy: b53: switchdev driver for Broadcom BCM53xx
 switches

From: Jiri Pirko <jiri@...nulli.us>
Date: Thu, 26 Feb 2015 15:44:33 +0100

> Thu, Feb 26, 2015 at 03:19:27PM CET, sfeldma@...il.com wrote:
>>Missing .ndo_start_xmit is the clue....do we need more?
> 
> You do not want to add null check for ndo_start_xmit to xmit path :)
> This should be some stub in case of no-tx.

Cheapest would be to force the device to use the noop_qdisc which
simply throws all packets away.

No fast path tests whatsoever.

Or we can attach an ndo_start_xmit that drops packets too.
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