netdev - RE: [Xen-devel] [PATCH 1/4] xen-netfront: remove unused variable `extra'

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Date:	Tue, 19 Mar 2013 10:03:58 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	annie li <annie.li@...cle.com>
CC:	Ian Campbell <Ian.Campbell@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Wei Liu <wei.liu2@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: RE: [Xen-devel] [PATCH 1/4] xen-netfront: remove unused variable
 `extra'

> -----Original Message-----
[snip] 
> For TCPv4 GSO, it seems one extra info request(NETTXF_extra_info) is
> enough in my winpv driver, and I did not process the
> XEN_NETIF_EXTRA_MORE.
> Do you create two extra info requests for bothTCPv4 and TCPv6 GSO like
> following?
> 
>   * [Request 2: netif_tx_extra]  (only if request 1 has NETTXF_extra_info)
>   * [Request 3: netif_tx_extra]  (only if request 2 has
> XEN_NETIF_EXTRA_MORE)
> 

No, I just use one. I don't use XEN_NETIF_EXTRA_FLAG_MORE. I thought you were questioning the existence of extra segments rather than this flag. I guess I got the wrong end of the stick.
I've not seen anything use XEN_NETIF_EXTRA_FLAG_MORE, but that's not to say nothing will use it in the future. Clearly something is needed to indicate subsequent extra segments should they ever be needed.

  Paul

> 
> > Extra segments are certainly not redundant; the Citrix Windows PV drivers
> send TSOs using them and handle LRO using them too.
> 
> About the LRO, upstream netback does not create any response with
> XEN_NETIF_EXTRA_MORE, so I assume your dom0 did such process?
> 
> Thanks
> Annie
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