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Date:	Thu, 15 Dec 2011 23:51:16 +0000
From:	Ben Hutchings <>
To:	David Miller <>
CC:	<>, <>,
	Matt Carlson <>
Subject: [PATCH net-next 1/3] ethtool: Clarify use of size field for

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: Ben Hutchings <>
 include/linux/ethtool.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 20db5b27..0ec2fd4 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -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
+ *	array size of the hardware indirection table.
  * @ring_index: RX ring/queue index for each hash value
 struct ethtool_rxfh_indir {

Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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