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Date: Wed, 16 Nov 2011 02:29:55 +0100 (CET)
From: Michał Mirosław <mirq-linux@...e.qmqm.pl>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Ben Hutchings <bhutchings@...arflare.com>
Subject: [PATCH v5 7/9] ethtool: prepare for larger netdev_features_t type
v2: changed loop in ethtool_set_features() per Ben's suggestion
Signed-off-by: Michał Mirosław <mirq-linux@...e.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;
--
1.7.7.1
--
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