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Commit 14596f70 authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller
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ethtool: Clarify use of size field for ETHTOOL_GRXFHINDIR 



In order to find out the device's RX flow hash table size, ethtool
initially uses ETHTOOL_GRXFHINDIR with a buffer size of zero.  This
must be supported, but it is not necessary to support any other user
buffer size less than the device table size.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5d531aaa

include/linux/ethtool.h

+3 −2
Original line number Diff line number Diff line
@@ -543,8 +543,9 @@ struct compat_ethtool_rxnfc { 
/**

 * struct ethtool_rxfh_indir - command to get or set RX flow hash indirection

 * @cmd: Specific command number - %ETHTOOL_GRXFHINDIR or %ETHTOOL_SRXFHINDIR

 * @size: On entry, the array size of the user buffer.  On return from

 *	%ETHTOOL_GRXFHINDIR, the array size of the hardware indirection table.

 * @size: On entry, the array size of the user buffer, which may be zero

 *	for %ETHTOOL_GRXFHINDIR.  On return from %ETHTOOL_GRXFHINDIR, the

 *	array size of the hardware indirection table.

 * @ring_index: RX ring/queue index for each hash value

 */

struct ethtool_rxfh_indir {