netdev - Re: [Xen-devel] [RFC PATCH 09/13] xen-netfront: move grant

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Date:	Tue, 19 May 2015 10:19:23 +0000
From:	Joao Martins <Joao.Martins@...lab.eu>
To:	David Vrabel <david.vrabel@...rix.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"wei.liu2@...rix.com" <wei.liu2@...rix.com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [RFC PATCH 09/13] xen-netfront: move grant_{ref,
 page} to struct grant


On 18 May 2015, at 17:44, David Vrabel <david.vrabel@...rix.com> wrote:
> On 12/05/15 18:18, Joao Martins wrote:
>> Refactors a little bit how grants are stored by moving
>> grant_rx_ref/grant_tx_ref and grant_tx_page to its
>> own structure, namely struct grant.
> 
> Reviewed-by: David Vrabel <david.vrabel@...rix.com>
> 
> Although...
> 
>> --- a/drivers/net/xen-netfront.c
>> +++ b/drivers/net/xen-netfront.c
>> @@ -87,6 +87,11 @@ struct netfront_cb {
>> /* IRQ name is queue name with "-tx" or "-rx" appended */
>> #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
>> 
>> +struct grant {
>> +	grant_ref_t ref;
>> +	struct page *page;
>> +};
> 
> Is this sort of structure (and the following patch) useful for other
> frontends?

Perhaps not. It seems that blkfront is the only one that uses similar structure.
Though it creates a struct grant containing an additional struct list_node
field that is used for the free grants list within blkfront. In my case I
extend the struct grant later on the patch  "xen-netfront: implement RX 
persistent grants" to have the struct ubuf_info.

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