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| author | Ben Hutchings <bhutchings@solarflare.com> | 2011-12-15 13:51:16 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-12-16 13:52:47 -0500 |
| commit | 14596f7006297b67516e2b6a2b26bcb11fe08fb3 (patch) | |
| tree | 02356cc1106bba9a80cd5664e60313a27992863f /include/linux/ethtool.h | |
| parent | 5d531aaa64a06622874f06e5068b8eefca048feb (diff) | |
| download | linux-14596f7006297b67516e2b6a2b26bcb11fe08fb3.tar.gz linux-14596f7006297b67516e2b6a2b26bcb11fe08fb3.tar.bz2 linux-14596f7006297b67516e2b6a2b26bcb11fe08fb3.zip | |
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>
Diffstat (limited to 'include/linux/ethtool.h')
| -rw-r--r-- | 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 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 { |