netdev - Re: [PATCH net-next 0/2] sunvnet: Packet processing in non-interrupt context.

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Date:	Mon, 6 Oct 2014 15:31:11 -0400
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	raghuram.kothakota@...cle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] sunvnet: Packet processing in non-interrupt
 context.

On (10/06/14 15:25), David Miller wrote:
> 
> > But we still need to hold the vio lock around the ldc_write 
> > (and also around dring write) in vnet_start_xmit, right?
> 
> You might be able to avoid it, you're fully serialized by the TX queue
> lock.

yes, I was just noticing that. The only place where I believe I need
to hold the vio spin-lock is to sync with the dr->cons checks
(the "should I send a start_cons LDC message?" check in vnet_start_xmit()
vs the vnet_ack() updates).

But isn't it better in general to declare NETIF_F_LLTX and have finer lock
granularity in the driver?

--Sowmini

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