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

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 83 insertions, 0 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 23ccea811297..0e5de2fb960c 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 b93575db8cce..8f00bdf95ef4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -449,6 +449,7 @@ 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 c5e059352d43..6f8b78bcfd84 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;
         }
@@ -959,3 +1018,5 @@ 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);