[PATCH v4 7/9] ethtool: prepare for larger netdev_features_t type
From: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Date: 2011-10-25 00:36:38
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
v2: changed loop in ethtool_set_features() per Ben's suggestion Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> --- net/core/ethtool.c | 42 ++++++++++++++++++++++++++---------------- 1 files changed, 26 insertions(+), 16 deletions(-)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 817ad4b..bbf84fe 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c@@ -38,7 +38,7 @@ EXPORT_SYMBOL(ethtool_op_get_link); /* Handlers for each ethtool command */ -#define ETHTOOL_DEV_FEATURE_WORDS 1 +#define ETHTOOL_DEV_FEATURE_WORDS ((NETDEV_FEATURE_COUNT + 31) / 32) static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = { [NETIF_F_SG_BIT] = "tx-scatter-gather",
@@ -82,16 +82,20 @@ static int ethtool_get_features(struct net_device *dev, void __user *useraddr) .cmd = ETHTOOL_GFEATURES, .size = ETHTOOL_DEV_FEATURE_WORDS, }; - struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS] = { - { - .available = dev->hw_features, - .requested = dev->wanted_features, - .active = dev->features, - .never_changed = NETIF_F_NEVER_CHANGE, - }, - }; + struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS]; u32 __user *sizeaddr; u32 copy_size; + int i; + + /* in case feature bits run out again */ + BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS*sizeof(u32) > sizeof(netdev_features_t)); + + for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) { + features[i].available = (u32)(dev->hw_features >> (32*i)); + features[i].requested = (u32)(dev->wanted_features >> (32*i)); + features[i].active = (u32)(dev->features >> (32*i)); + features[i].never_changed = (u32)(NETIF_F_NEVER_CHANGE >> (32*i)); + } sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size); if (get_user(copy_size, sizeaddr))
@@ -113,7 +117,8 @@ static int ethtool_set_features(struct net_device *dev, void __user *useraddr) { struct ethtool_sfeatures cmd; struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS]; - int ret = 0; + netdev_features_t wanted = 0, valid = 0; + int i, ret = 0; if (copy_from_user(&cmd, useraddr, sizeof(cmd))) return -EFAULT;
@@ -125,19 +130,24 @@ static int ethtool_set_features(struct net_device *dev, void __user *useraddr) if (copy_from_user(features, useraddr, sizeof(features))) return -EFAULT; - if (features[0].valid & ~NETIF_F_ETHTOOL_BITS) + for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) { + valid |= (netdev_features_t)features[i].valid << (32*i); + wanted |= (netdev_features_t)features[i].requested << (32*i); + } + + if (valid & ~NETIF_F_ETHTOOL_BITS) return -EINVAL; - if (features[0].valid & ~dev->hw_features) { - features[0].valid &= dev->hw_features; + if (valid & ~dev->hw_features) { + valid &= dev->hw_features; ret |= ETHTOOL_F_UNSUPPORTED; } - dev->wanted_features &= ~features[0].valid; - dev->wanted_features |= features[0].valid & features[0].requested; + dev->wanted_features &= ~valid; + dev->wanted_features |= wanted & valid; __netdev_update_features(dev); - if ((dev->wanted_features ^ dev->features) & features[0].valid) + if ((dev->wanted_features ^ dev->features) & valid) ret |= ETHTOOL_F_WISH; return ret;
--
1.7.6.3