'\" t
.\"     Title: skb_seq_read
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Linux Networking
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "SKB_SEQ_READ" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Linux Networking"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
skb_seq_read \- Sequentially read skb data
.SH "SYNOPSIS"
.HP \w'unsigned\ int\ skb_seq_read('u
.BI "unsigned int skb_seq_read(unsigned\ int\ " "consumed" ", const\ u8\ **\ " "data" ", struct\ skb_seq_state\ *\ " "st" ");"
.SH "ARGUMENTS"
.PP
\fIconsumed\fR
.RS 4
number of bytes consumed by the caller so far
.RE
.PP
\fIdata\fR
.RS 4
destination pointer for data to be returned
.RE
.PP
\fIst\fR
.RS 4
state variable
.RE
.SH "DESCRIPTION"
.PP
Reads a block of skb data at
\fIconsumed\fR
relative to the lower offset specified to
\fBskb_prepare_seq_read\fR\&. Assigns the head of the data block to
\fIdata\fR
and returns the length of the block or 0 if the end of the skb data or the upper offset has been reached\&.
.PP
The caller is not required to consume all of the data returned, i\&.e\&.
\fIconsumed\fR
is typically set to the number of bytes already consumed and the next call to
\fBskb_seq_read\fR
will return the remaining part of the block\&.
.PP
Note 1: The size of each block of data returned can be arbitrary, this limitation is the cost for zerocopy sequential reads of potentially non linear data\&.
.PP
Note 2: Fragment lists within fragments are not implemented at the moment, state\->root_skb could be replaced with a stack for this purpose\&.
.SH "COPYRIGHT"
.br