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Date: Thu, 28 May 2015 17:20:05 +0300 From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com> To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net CC: John Fastabend <john.r.fastabend@...el.com>, netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com, Alex Duyck <alexander.h.duyck@...hat.com> Subject: Re: [net-next 01/14] ethtool: Add helper routines to pass vf to rx_flow_spec Hello. On 5/28/2015 2:25 PM, Jeff Kirsher wrote: > From: John Fastabend <john.r.fastabend@...el.com> > The ring_cookie is 64 bits wide which is much larger than can be used > for actual queue index values. So provide some helper routines to > pack a VF index into the cookie. This is useful to steer packets to > a VF ring without having to know the queue layout of the device. > CC: Alex Duyck <alexander.h.duyck@...hat.com> > Signed-off-by: John Fastabend <john.r.fastabend@...el.com> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> > --- > include/uapi/linux/ethtool.h | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h > index ae832b4..0594933 100644 > --- a/include/uapi/linux/ethtool.h > +++ b/include/uapi/linux/ethtool.h > @@ -796,6 +796,31 @@ struct ethtool_rx_flow_spec { > __u32 location; > }; > > +/* How rings are layed out when accessing virtual functions or s/layed/laid/. > + * offloaded queues is device specific. To allow users to do flow > + * steering and specify these queues the ring cookie is partitioned > + * into a 32bit queue index with an 8 bit virtual function id. > + * This also leaves the 3bytes for further specifiers. It is possible > + * future devices may support more than 256 virtual functions if > + * devices start supporting PCIe w/ARI. However at the moment I > + * do not know of any devices that support this so I do not reserve > + * space for this at this time. If a future patch consumes the next > + * byte it should be aware of this possiblity. Possibility. [...] WBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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