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ethtool: Name the 'no change' value for setting RSS hash key but not indir table

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We usually allocate special values of u32 fields starting from the top
down, so also change the value to 0xffffffff.  As these operations
haven't been included in a stable release yet, it's not too late to
change.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Ben Hutchings 2014-05-15 01:41:23 +01:00
parent fb95cd8d14
commit 7455fa2422
2 changed files with 14 additions and 10 deletions
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12
include/uapi/linux/ethtool.h
View File

@ -850,7 +850,8 @@ 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.
* @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,
@ -861,10 +862,10 @@ struct ethtool_rxfh_indir {
* of size @indir_size followed by hash key of size @key_size.
*
* For %ETHTOOL_GRSSH, a @indir_size and key_size of zero means that only the
* size should be returned. For %ETHTOOL_SRSSH, a @indir_size of 0xDEADBEEF
* means that indir table setting is not requested and a @indir_size of zero
* means the indir table should be reset to default values. This last feature
* is not supported by the original implementations.
* size should be returned. For %ETHTOOL_SRSSH, an @indir_size of
* %ETH_RXFH_INDIR_NO_CHANGE means that indir table setting is not requested
* and a @indir_size of zero means the indir table should be reset to default
* values.
*/
struct ethtool_rxfh {
__u32 cmd;
@ -874,6 +875,7 @@ struct ethtool_rxfh {
__u32 rsvd[2];
__u32 rss_config[0];
};
#define ETH_RXFH_INDIR_NO_CHANGE 0xffffffff
/**
* struct ethtool_rx_ntuple_flow_spec - specification for RX flow filter

12
net/core/ethtool.c
View File

@ -803,12 +803,13 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
/* If either indir or hash key is valid, proceed further.
*/
if ((user_indir_size && ((user_indir_size != 0xDEADBEEF) &&
user_indir_size != dev_indir_size)) ||
if ((user_indir_size &&
user_indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
user_indir_size != dev_indir_size) ||
(user_key_size && (user_key_size != dev_key_size)))
return -EINVAL;
if (user_indir_size != 0xDEADBEEF)
if (user_indir_size != ETH_RXFH_INDIR_NO_CHANGE)
indir_bytes = dev_indir_size * sizeof(indir[0]);
rss_config = kzalloc(indir_bytes + user_key_size, GFP_USER);
@ -821,9 +822,10 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
goto out;
/* user_indir_size == 0 means reset the indir table to default.
* user_indir_size == 0xDEADBEEF means indir setting is not requested.
* user_indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
*/
if (user_indir_size && user_indir_size != 0xDEADBEEF) {
if (user_indir_size &&
user_indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
indir = (u32 *)rss_config;
ret = ethtool_copy_validate_indir(indir,
useraddr + rss_cfg_offset,