WIMAX_MSG_ALLOC

Section: Linux Networking (9)
Updated: February 2011
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NAME

wimax_msg_alloc - Create a new skb for sending a message to userspace

SYNOPSIS

struct sk_buff * wimax_msg_alloc(struct wimax_dev * wimax_dev, const char * pipe_name, const void * msg, size_t size, gfp_t gfp_flags);

ARGUMENTS

wimax_dev

: WiMAX device descriptor

pipe_name

: "named pipe" the message will be sent to

msg

: pointer to the message data to send

size

: size of the message to send (in bytes), including the header.

gfp_flags

: flags for memory allocation.

RETURNS

0 if ok, negative errno code on error

DESCRIPTION

Allocates an skb that will contain the message to send to user space over the messaging pipe and initializes it, copying the payload.

Once this call is done, you can deliver it with wimax_msg_send.

IMPORTANT

Don't use skb_push/skb_pull/skb_reserve on the skb, as wimax_msg_send depends on skb->data being placed at the beginning of the user message.

Unlike other WiMAX stack calls, this call can be used way early, even before wimax_dev_add is called, as long as the wimax_dev->net_dev pointer is set to point to a proper net_dev. This is so that drivers can use it early in case they need to send stuff around or communicate with user space.