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Date: Thu, 08 Apr 2010 10:35:34 -0700
From: chavey@...gle.com
To: davem@...emloft.net
CC: netdev@...r.kernel.org, therbert@...gle.com
Subject: [PATCH 1/1] add ethtool loopback support
From: Ranjit Manomohan <ranjitm@...gle.com>
Date: Wed, 7 Apr 2010 15:19:48 -0700
Add an ethtool option to use internal loopback mode for testing.
This feature is used for component and driver test coverage by putting
the device in hardware loopback mode and sending / receiving network
traffic from a user application to test the hardware and driver
transmit / receive paths.
Signed-off-by: laurent chavey <chavey@...gle.com>
---
include/linux/ethtool.h | 16 ++++++++++++++++
net/core/ethtool.c | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index b33f316..df1dcc7 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -292,6 +292,18 @@ struct ethtool_stats {
__u64 data[0];
};
+/* for setting the NIC into loopback mode */
+struct ethtool_loopback {
+ u32 cmd; /* ETHTOOL_SLOOPBACK */
+ u32 type; /* ethtool_loopback_type */
+};
+
+enum ethtool_loopback_type {
+ ETH_MAC = 0x00000001,
+ ETH_PHY_INT = 0x00000002,
+ ETH_PHY_EXT = 0x00000004
+};
+
struct ethtool_perm_addr {
__u32 cmd; /* ETHTOOL_GPERMADDR */
__u32 size;
@@ -566,6 +578,8 @@ struct ethtool_ops {
int (*reset)(struct net_device *, u32 *);
int (*set_rx_ntuple)(struct net_device *, struct ethtool_rx_ntuple *);
int (*get_rx_ntuple)(struct net_device *, u32 stringset, void *);
+ int (*set_loopback)(struct net_device *, struct ethtool_loopback *);
+ int (*get_loopback)(struct net_device *, struct ethtool_loopback *);
};
#endif /* __KERNEL__ */
@@ -627,6 +641,8 @@ struct ethtool_ops {
#define ETHTOOL_SRXNTUPLE 0x00000035 /* Add an n-tuple filter to device */
#define ETHTOOL_GRXNTUPLE 0x00000036 /* Get n-tuple filters from device */
#define ETHTOOL_GSSET_INFO 0x00000037 /* Get string set info */
+#define ETHTOOL_SLOOPBACK 0x00000038 /* Set loopback mode on/off */
+#define ETHTOOL_GLOOPBACK 0x00000039 /* Get loopback mode setting */
/* compatibility with older code */
#define SPARC_ETH_GSET ETHTOOL_GSET
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f4cb6b6..89b4ecb 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1289,6 +1289,40 @@ static noinline_for_stack int ethtool_flash_device(struct net_device *dev, char
return dev->ethtool_ops->flash_device(dev, &efl);
}
+static int ethtool_set_loopback(struct net_device *dev, void __user *useraddr)
+{
+ struct ethtool_loopback lpbk;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+
+ if (!ops->set_loopback)
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&lpbk, useraddr, sizeof(lpbk)))
+ return -EFAULT;
+
+ return ops->set_loopback(dev, &lpbk);
+}
+
+static int ethtool_get_loopback(struct net_device *dev, void __user *useraddr)
+{
+ struct ethtool_loopback lpbk;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ int err;
+
+ if (!ops->get_loopback)
+ return -EOPNOTSUPP;
+
+ err = ops->get_loopback(dev, &lpbk);
+
+ if (err)
+ return err;
+
+ if (copy_to_user(useraddr, &lpbk, sizeof(lpbk)))
+ return -EFAULT;
+
+ return 0;
+}
+
/* The main entry point in this file. Called from net/core/dev.c */
int dev_ethtool(struct net *net, struct ifreq *ifr)
@@ -1518,6 +1552,12 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GSSET_INFO:
rc = ethtool_get_sset_info(dev, useraddr);
break;
+ case ETHTOOL_SLOOPBACK:
+ rc = ethtool_set_loopback(dev, useraddr);
+ break;
+ case ETHTOOL_GLOOPBACK:
+ rc = ethtool_get_loopback(dev, useraddr);
+ break;
default:
rc = -EOPNOTSUPP;
}
--
1.7.0.1
--
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