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Commit 8cf6f497 authored by John Fastabend's avatar John Fastabend Committed by Jeff Kirsher
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ethtool: Add helper routines to pass vf to rx_flow_spec 



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@redhat.com>
Signed-off-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent ed2dfd90

include/uapi/linux/ethtool.h

+25 −0
Original line number Diff line number Diff line
@@ -796,6 +796,31 @@ struct ethtool_rx_flow_spec { 
	__u32		location;

};



/* How rings are layed out when accessing virtual functions or

 * 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.

 */

#define ETHTOOL_RX_FLOW_SPEC_RING	0x00000000FFFFFFFFLL

#define ETHTOOL_RX_FLOW_SPEC_RING_VF	0x000000FF00000000LL

#define ETHTOOL_RX_FLOW_SPEC_RING_VF_OFF 32

static inline __u64 ethtool_get_flow_spec_ring(__u64 ring_cookie)

{

	return ETHTOOL_RX_FLOW_SPEC_RING & ring_cookie;

};



static inline __u64 ethtool_get_flow_spec_ring_vf(__u64 ring_cookie)

{

	return (ETHTOOL_RX_FLOW_SPEC_RING_VF & ring_cookie) >>

				ETHTOOL_RX_FLOW_SPEC_RING_VF_OFF;

};



/**

 * struct ethtool_rxnfc - command to get or set RX flow classification rules

 * @cmd: Specific command number - %ETHTOOL_GRXFH, %ETHTOOL_SRXFH,