netdev_alloc_skb(9) [centos man page]

NETDEV_ALLOC_SKB(9)						 Linux Networking					       NETDEV_ALLOC_SKB(9)

NAME

       netdev_alloc_skb - allocate an skbuff for rx on a specific device

SYNOPSIS

       struct sk_buff * netdev_alloc_skb(struct net_device * dev, unsigned int length);

ARGUMENTS

       dev
	   network device to receive on

       length
	   length to allocate

DESCRIPTION

       Allocate a new sk_buff and assign it a usage count of one. The buffer has unspecified headroom built in. Users should allocate the headroom
       they think they need without accounting for the built in space. The built in space is used for optimisations.

       NULL is returned if there is no free memory. Although this function allocates memory it can be called from an interrupt.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						       NETDEV_ALLOC_SKB(9)

CFG80211_TESTMODE_AL(9) 					     Test mode						   CFG80211_TESTMODE_AL(9)

NAME

       cfg80211_testmode_alloc_reply_skb - allocate testmode reply

SYNOPSIS

       struct sk_buff * cfg80211_testmode_alloc_reply_skb(struct wiphy * wiphy, int approxlen);

ARGUMENTS

       wiphy
	   the wiphy

       approxlen
	   an upper bound of the length of the data that will be put into the skb

DESCRIPTION

       This function allocates and pre-fills an skb for a reply to the testmode command. Since it is intended for a reply, calling it outside of
       the testmode_cmd operation is invalid.

       The returned skb is pre-filled with the wiphy index and set up in a way that any data that is put into the skb (with skb_put, nla_put or
       similar) will end up being within the NL80211_ATTR_TESTDATA attribute, so all that needs to be done with the skb is adding data for the
       corresponding userspace tool which can then read that data out of the testdata attribute. You must not modify the skb in any other way.

       When done, call cfg80211_testmode_reply with the skb and return its error code as the result of the testmode_cmd operation.

RETURN

       An allocated and pre-filled skb.  NULL if any errors happen.

AUTHOR

       Johannes Berg <johannes@sipsolutions.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   CFG80211_TESTMODE_AL(9)