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authorBen Hutchings <bhutchings@solarflare.com>2011-12-15 13:51:16 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-16 13:52:47 -0500
commit14596f7006297b67516e2b6a2b26bcb11fe08fb3 (patch)
tree02356cc1106bba9a80cd5664e60313a27992863f
parent5d531aaa64a06622874f06e5068b8eefca048feb (diff)
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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: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/ethtool.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 20db5b275c3f..0ec2fd412d03 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
+ * 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 {