From 7455fa2422898eee3464032351d20695930d9542 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Thu, 15 May 2014 01:41:23 +0100 Subject: [PATCH] ethtool: Name the 'no change' value for setting RSS hash key but not indir table 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 --- include/uapi/linux/ethtool.h | 12 +++++++----- net/core/ethtool.c | 12 +++++++----- 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h index d47d31d6fa0e..cba18e3f8fab 100644 --- a/include/uapi/linux/ethtool.h +++ b/include/uapi/linux/ethtool.h @@ -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 diff --git a/net/core/ethtool.c b/net/core/ethtool.c index c834cb29f682..7156fe5ca876 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -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, -- 2.20.1