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ethtool: Improve explanation of the two arrays following struct ethtool_rxfh

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The use of two variable-length arrays is unusual so deserves a bit
more explanation.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Ben Hutchings 2014-05-15 01:07:16 +01:00
parent 7455fa2422
commit 38c891a49d
1 changed files with 9 additions and 8 deletions
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17
include/uapi/linux/ethtool.h
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@ -850,16 +850,17 @@ struct ethtool_rxfh_indir {
* struct ethtool_rxfh - command to get/set RX flow hash indir or/and hash key.
* @cmd: Specific command number - %ETHTOOL_GRSSH or %ETHTOOL_SRSSH
* @rss_context: RSS context identifier.
* @indir_size: On entry, the array size of the user buffer, which may be zero,
* or (for %ETHTOOL_SRSSH), %ETH_RXFH_INDIR_NO_CHANGE.
* On return from %ETHTOOL_GRSSH, the array size of the hardware
* indirection table.
* @key_size: On entry, the array size of the user buffer in bytes,
* which may be zero.
* On return from %ETHTOOL_GRSSH, the size of the RSS hash key.
* @indir_size: On entry, the array size of the user buffer for the
* indirection table, which may be zero, or (for %ETHTOOL_SRSSH),
* %ETH_RXFH_INDIR_NO_CHANGE. On return from %ETHTOOL_GRSSH,
* the array size of the hardware indirection table.
* @key_size: On entry, the array size of the user buffer for the hash key,
* which may be zero. On return from %ETHTOOL_GRSSH, the size of the
* hardware hash key.
* @rsvd: Reserved for future extensions.
* @rss_config: RX ring/queue index for each hash value i.e., indirection table
* of size @indir_size followed by hash key of size @key_size.
* of @indir_size __u32 elements, followed by hash key of @key_size
* bytes.
*
* For %ETHTOOL_GRSSH, a @indir_size and key_size of zero means that only the
* size should be returned. For %ETHTOOL_SRSSH, an @indir_size of