NETREG_DUMMY is not available for older kernels, it should be set to
something not normal. NETREG_DUMMY is set to 5 in new kernel versions.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
compat/compat-2.6.29.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/compat-2.6.29.h | 2 ++
2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/compat/compat-2.6.29.c b/compat/compat-2.6.29.c
index 2e7e623..a2354f9 100644
--- a/compat/compat-2.6.29.c
+++ b/compat/compat-2.6.29.c
@@ -124,6 +124,46 @@ int eth_validate_addr(struct net_device *dev)
EXPORT_SYMBOL(eth_validate_addr);
/* Source: net/ethernet/eth.c */
+#define NETREG_DUMMY 5
+/**
+ * init_dummy_netdev - init a dummy network device for NAPI
+ * @dev: device to init
+ *
+ * This takes a network device structure and initialize the minimum
+ * amount of fields so it can be used to schedule NAPI polls without
+ * registering a full blown interface. This is to be used by drivers
+ * that need to tie several hardware interfaces to a single NAPI
+ * poll scheduler due to HW limitations.
+ */
+int init_dummy_netdev(struct net_device *dev)
+{
+ /* Clear everything. Note we don't initialize spinlocks
+ * are they aren't supposed to be taken by any of the
+ * NAPI code and this dummy netdev is supposed to be
+ * only ever used for NAPI polls
+ */
+ memset(dev, 0, sizeof(struct net_device));
+
+ /* make sure we BUG if trying to hit standard
+ * register/unregister code path
+ */
+ dev->reg_state = NETREG_DUMMY;
+
+ /* initialize the ref count */
+ atomic_set(&dev->refcnt, 1);
+
+ /* NAPI wants this */
+ INIT_LIST_HEAD(&dev->napi_list);
+
+ /* a dummy interface is started by default */
+ set_bit(__LINK_STATE_PRESENT, &dev->state);
+ set_bit(__LINK_STATE_START, &dev->state);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(init_dummy_netdev);
+/* Source: net/core/dev.c */
+
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29) */
diff --git a/include/linux/compat-2.6.29.h b/include/linux/compat-2.6.29.h
index a1a989c..cce678f 100644
--- a/include/linux/compat-2.6.29.h
+++ b/include/linux/compat-2.6.29.h
@@ -274,6 +274,8 @@ static inline struct net *read_pnet(struct net * const *pnet)
#endif
+extern int init_dummy_netdev(struct net_device *dev);
+
#else
static inline void netdev_attach_ops(struct net_device *dev,
--
1.7.0.4
--
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