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Subject[PATCH 1/4] Add ETHTOOL_[GS]FLAGS sub-ioctls

Also, adds support for the first flag, LRO.

Earlier version of this patch posted about 12 hours ago.


commit 84bf82f38dacde0fa86986e23c061728e819810e
Author: Jeff Garzik <jeff@garzik.org>
Date: Fri Aug 10 05:27:23 2007 -0400

[ETHTOOL] Add ETHTOOL_[GS]FLAGS sub-ioctls

Signed-off-by: Jeff Garzik <jeff@garzik.org>

include/linux/ethtool.h | 21 +++++++++++++++
include/linux/netdevice.h | 1
net/core/ethtool.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 83 insertions(+)
84bf82f38dacde0fa86986e23c061728e819810e
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 23ccea8..0e5de2f 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -256,6 +256,19 @@ struct ethtool_perm_addr {
__u8 data[0];
};

+/* boolean flags controlling per-interface behavior characteristics.
+ * When reading, the flag indicates whether or not a certain behavior
+ * is enabled/present. When writing, the flag indicates whether
+ * or not the driver should turn on (set) or off (clear) a behavior.
+ *
+ * Some behaviors may read-only (unconditionally absent or present).
+ * If such is the case, return EINVAL in the set-flags operation if the
+ * flag differs from the read-only value.
+ */
+enum ethtool_flags {
+ ETH_FLAG_LRO = (1 << 15), /* LRO is enabled */
+};
+
#ifdef __KERNEL__

struct net_device;
@@ -272,6 +285,8 @@ u32 ethtool_op_get_tso(struct net_device *dev);
int ethtool_op_set_tso(struct net_device *dev, u32 data);
u32 ethtool_op_get_ufo(struct net_device *dev);
int ethtool_op_set_ufo(struct net_device *dev, u32 data);
+u32 ethtool_op_get_flags(struct net_device *dev);
+int ethtool_op_set_flags(struct net_device *dev, u32 data);

/**
* &ethtool_ops - Alter and report network device settings
@@ -307,6 +322,8 @@ int ethtool_op_set_ufo(struct net_device *dev, u32 data);
* get_strings: Return a set of strings that describe the requested objects
* phys_id: Identify the device
* get_stats: Return statistics about the device
+ * get_flags: get 32-bit flags bitmap
+ * set_flags: set 32-bit flags bitmap
*
* Description:
*
@@ -369,6 +386,8 @@ struct ethtool_ops {
void (*complete)(struct net_device *);
u32 (*get_ufo)(struct net_device *);
int (*set_ufo)(struct net_device *, u32);
+ u32 (*get_flags)(struct net_device *);
+ int (*set_flags)(struct net_device *, u32);
};
#endif /* __KERNEL__ */

@@ -410,6 +429,8 @@ struct ethtool_ops {
#define ETHTOOL_SUFO 0x00000022 /* Set UFO enable (ethtool_value) */
#define ETHTOOL_GGSO 0x00000023 /* Get GSO enable (ethtool_value) */
#define ETHTOOL_SGSO 0x00000024 /* Set GSO enable (ethtool_value) */
+#define ETHTOOL_GFLAGS 0x00000025 /* Get flags bitmap(ethtool_value) */
+#define ETHTOOL_SFLAGS 0x00000026 /* Set flags bitmap(ethtool_value) */

/* compatibility with older code */
#define SPARC_ETH_GSET ETHTOOL_GSET
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4a616d7..559a4dc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -341,6 +341,7 @@ struct net_device
#define NETIF_F_GSO 2048 /* Enable software GSO. */
#define NETIF_F_LLTX 4096 /* LockLess TX */
#define NETIF_F_MULTI_QUEUE 16384 /* Has multiple TX/RX queues */
+#define NETIF_F_LRO 32768 /* large receive offload */

/* Segmentation offload features */
#define NETIF_F_GSO_SHIFT 16
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 2ab0a60..6e8563e 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -109,6 +109,32 @@ int ethtool_op_set_ufo(struct net_device *dev, u32 data)
return 0;
}

+/* the following list of flags are the same as their associated
+ * NETIF_F_xxx values in include/linux/netdevice.h
+ */
+static const u32 flags_dup_features =
+ ETH_FLAG_LRO;
+
+u32 ethtool_op_get_flags(struct net_device *dev)
+{
+ /* in the future, this function will probably contain additional
+ * handling for flags which are not so easily handled
+ * by a simple masking operation
+ */
+
+ return dev->features & flags_dup_features;
+}
+
+int ethtool_op_set_flags(struct net_device *dev, u32 data)
+{
+ if (data & ETH_FLAG_LRO)
+ dev->features |= NETIF_F_LRO;
+ else
+ dev->features &= ~NETIF_F_LRO;
+
+ return 0;
+}
+
/* Handlers for each ethtool command */

static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
@@ -783,6 +809,33 @@ static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
return 0;
}

+static int ethtool_get_flags(struct net_device *dev, char __user *useraddr)
+{
+ struct ethtool_value edata = { ETHTOOL_GFLAGS };
+
+ if (!dev->ethtool_ops->get_flags)
+ return -EOPNOTSUPP;
+
+ edata.data = dev->ethtool_ops->get_flags(dev);
+
+ if (copy_to_user(useraddr, &edata, sizeof(edata)))
+ return -EFAULT;
+ return 0;
+}
+
+static int ethtool_set_flags(struct net_device *dev, char __user *useraddr)
+{
+ struct ethtool_value edata;
+
+ if (!dev->ethtool_ops->set_flags)
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&edata, useraddr, sizeof(edata)))
+ return -EFAULT;
+
+ return dev->ethtool_ops->set_flags(dev, edata.data);
+}
+
/* The main entry point in this file. Called from net/core/dev.c */

int dev_ethtool(struct ifreq *ifr)
@@ -935,6 +988,12 @@ int dev_ethtool(struct ifreq *ifr)
case ETHTOOL_SGSO:
rc = ethtool_set_gso(dev, useraddr);
break;
+ case ETHTOOL_GFLAGS:
+ rc = ethtool_get_flags(dev, useraddr);
+ break;
+ case ETHTOOL_SFLAGS:
+ rc = ethtool_set_flags(dev, useraddr);
+ break;
default:
rc = -EOPNOTSUPP;
}
@@ -960,3 +1019,5 @@ EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
EXPORT_SYMBOL(ethtool_op_set_ufo);
EXPORT_SYMBOL(ethtool_op_get_ufo);
+EXPORT_SYMBOL(ethtool_op_set_flags);
+EXPORT_SYMBOL(ethtool_op_get_flags);
-
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