[NET]: docbook fixes for netif_ functions

Documentation updates for network interfaces.

1. Add doc for netif_napi_add
2. Remove doc for unused returns from netif_rx
3. Add doc for netif_receive_skb

[ Incorporated minor mods from Randy Dunlap -DaveM ]

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 25 insertions, 3 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9b0c8f12373e..1e6af4f174b6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -739,6 +739,16 @@ static inline void *netdev_priv(const struct net_device *dev)
  */
 #define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 
+/**
+ *      netif_napi_add - initialize a napi context
+ *      @dev:  network device
+ *      @napi: napi context
+ *      @poll: polling function
+ *      @weight: default weight
+ *
+ * netif_napi_add() must be used to initialize a napi context prior to calling
+ * *any* of the other napi related functions.
+ */
 static inline void netif_napi_add(struct net_device *dev,
                                   struct napi_struct *napi,
                                   int (*poll)(struct napi_struct *, int),
diff --git a/net/core/dev.c b/net/core/dev.c
index 91ece48e127e..be6cedab5aa8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1751,9 +1751,6 @@ DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
  *
  *      return values:
  *      NET_RX_SUCCESS  (no congestion)
- *      NET_RX_CN_LOW   (low congestion)
- *      NET_RX_CN_MOD   (moderate congestion)
- *      NET_RX_CN_HIGH  (high congestion)
  *      NET_RX_DROP     (packet was dropped)
  *
  */
@@ -2001,6 +1998,21 @@ out:
 }
 #endif
 
+/**
+ *      netif_receive_skb - process receive buffer from network
+ *      @skb: buffer to process
+ *
+ *      netif_receive_skb() is the main receive data processing function.
+ *      It always succeeds. The buffer may be dropped during processing
+ *      for congestion control or by the protocol layers.
+ *
+ *      This function may only be called from softirq context and interrupts
+ *      should be enabled.
+ *
+ *      Return values (usually ignored):
+ *      NET_RX_SUCCESS: no congestion
+ *      NET_RX_DROP: packet was dropped
+ */
 int netif_receive_skb(struct sk_buff *skb)
 {
         struct packet_type *ptype, *pt_prev;