netdev - Re: [PATCH v3 1/4] net: Add support for hardware-offloaded encapsulation

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Message-Id: <20121207.142845.1145515122357569641.davem@davemloft.net>
Date:	Fri, 07 Dec 2012 14:28:45 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	joseph.gasparakis@...el.com
Cc:	bhutchings@...arflare.com, alexander.h.duyck@...el.com,
	shemminger@...tta.com, chrisw@...s-sol.org, gospo@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmitry@...adcom.com, saeed.bishara@...il.com,
	peter.p.waskiewicz.jr@...el.com
Subject: Re: [PATCH v3 1/4] net: Add support for hardware-offloaded
 encapsulation

From: Joseph Gasparakis <joseph.gasparakis@...el.com>
Date: Fri, 7 Dec 2012 10:24:17 -0800 (PST)

> So the idea here is that the driver will use the headers for checksumming 
> if the skb->encapsulation bit is on. The bit should be set in the protocol 
> driver.
> 
> To answer the second comment, the flags that we use in this series of 
> patches is NETIF_F_IP_CSUM, NETIF_F_IPV6_CSUM and NETIF_F_SG. These are 
> the bits that we propose will be used for checksumming of encapsulation. 
> As per a previous comment in v2, the hw_enc_features field should be used 
> also in the future when NICs have more encap offloads, so one could
> indicate these features there from the driver.
> 
> Furthermore, I submitted a patch for Rx checksumming, where NETIF_F_RXCSUM 
> is used, again in conjunction with skb->encapsulation flag. As I mention 
> in my logs, the driver is expected to set the ip_summed to UNNECESSARY and 
> turn the skb->encapsulation on, to indicate that the inner headers are 
> already HW checksummed.
> 

This is the kind of language that belongs in the commit message and
code comments.
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