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Date: Thu, 09 Aug 2007 09:41:17 -0700
From: Auke Kok <auke-jan.h.kok@...el.com>
To: davem@...emloft.net, jeff@...zik.org
Cc: netdev@...r.kernel.org, ossthema@...ibm.com
Subject: [PATCH] [NET] ethtool: Add LRO support
Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---
include/linux/ethtool.h | 8 +++++++
include/linux/netdevice.h | 1 +
net/core/ethtool.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 23ccea8..a97248e 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -272,6 +272,8 @@ 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_lro(struct net_device *dev);
+int ethtool_op_set_lro(struct net_device *dev, u32 data);
/**
* ðtool_ops - Alter and report network device settings
@@ -303,6 +305,8 @@ int ethtool_op_set_ufo(struct net_device *dev, u32 data);
* set_tso: Turn TCP segmentation offload on or off
* get_ufo: Report whether UDP fragmentation offload is enabled
* set_ufo: Turn UDP fragmentation offload on or off
+ * get_lro: Report whether large receive offload is enabled
+ * set_lro: Turn large receive offload on or off
* self_test: Run specified self-tests
* get_strings: Return a set of strings that describe the requested objects
* phys_id: Identify the device
@@ -369,6 +373,8 @@ struct ethtool_ops {
void (*complete)(struct net_device *);
u32 (*get_ufo)(struct net_device *);
int (*set_ufo)(struct net_device *, u32);
+ u32 (*get_lro)(struct net_device *);
+ int (*set_lro)(struct net_device *, u32);
};
#endif /* __KERNEL__ */
@@ -410,6 +416,8 @@ 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_GLRO 0x00000025 /* Get LRO enable (ethtool_value) */
+#define ETHTOOL_SLRO 0x00000026 /* Set LRO enable (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..4863ffc 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 /* Has 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..65f751b 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -109,6 +109,20 @@ int ethtool_op_set_ufo(struct net_device *dev, u32 data)
return 0;
}
+u32 ethtool_op_get_lro(struct net_device *dev)
+{
+ return (dev->features & NETIF_F_LRO) != 0;
+}
+
+int ethtool_op_set_lro(struct net_device *dev, u32 data)
+{
+ if (data)
+ 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)
@@ -504,6 +518,13 @@ static int __ethtool_set_sg(struct net_device *dev, u32 data)
if (err)
return err;
}
+
+ if (!data && dev->ethtool_ops->set_lro) {
+ err = dev->ethtool_ops->set_lro(dev, 0);
+ if (err)
+ return err;
+ }
+
return dev->ethtool_ops->set_sg(dev, data);
}
@@ -615,6 +636,29 @@ static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
return dev->ethtool_ops->set_ufo(dev, edata.data);
}
+static int ethtool_get_lro(struct net_device *dev, char __user *useraddr)
+{
+ struct ethtool_value edata = { ETHTOOL_GLRO };
+
+ edata.data = dev->features & NETIF_F_LRO;
+ if (copy_to_user(useraddr, &edata, sizeof(edata)))
+ return -EFAULT;
+ return 0;
+}
+
+static int ethtool_set_lro(struct net_device *dev, char __user *useraddr)
+{
+ struct ethtool_value edata;
+
+ if (copy_from_user(&edata, useraddr, sizeof(edata)))
+ return -EFAULT;
+ if (edata.data)
+ dev->features |= NETIF_F_LRO;
+ else
+ dev->features &= ~NETIF_F_LRO;
+ return 0;
+}
+
static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
{
struct ethtool_value edata = { ETHTOOL_GGSO };
@@ -816,6 +860,7 @@ int dev_ethtool(struct ifreq *ifr)
case ETHTOOL_GTSO:
case ETHTOOL_GPERMADDR:
case ETHTOOL_GUFO:
+ case ETHTOOL_GLRO:
case ETHTOOL_GGSO:
break;
default:
@@ -929,6 +974,12 @@ int dev_ethtool(struct ifreq *ifr)
case ETHTOOL_SUFO:
rc = ethtool_set_ufo(dev, useraddr);
break;
+ case ETHTOOL_GLRO:
+ rc = ethtool_get_lro(dev, useraddr);
+ break;
+ case ETHTOOL_SLRO:
+ rc = ethtool_set_lro(dev, useraddr);
+ break;
case ETHTOOL_GGSO:
rc = ethtool_get_gso(dev, useraddr);
break;
@@ -960,3 +1011,5 @@ 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_lro);
+EXPORT_SYMBOL(ethtool_op_get_lro);
-
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