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><A
NAME="IO-ETH-DRV-UPPER-API">Upper Layer Functions</H1
><P
>Upper layer functions are called by drivers to deliver received packets
or transmission completion status back up into the network stack.</P
><P
>These functions are defined by the hardware independent upper layers of
the networking driver support.  They are present to hide the interfaces
to the actual networking stack so that the hardware drivers may
be used by different network stack implementations without change.</P
><P
>These functions require a pointer to a <SPAN
CLASS="TYPE"
>struct eth_drv_sc</SPAN
>
which describes the interface at a logical level.  It is assumed that the
low level hardware driver will keep track of this pointer so
it may be passed &#8220;up&#8221; as appropriate.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="IO-ETH-DRV-UPPER-INIT">Callback Init function</H2
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void (sc-&#62;funs-&#62;eth_drv-&#62;init)(
		struct eth_drv_sc *sc, unsigned char *enaddr)</PRE
></TD
></TR
></TABLE
>
This function establishes the device at initialization time.
It should be called once per device instance only, from the
initialization function, if all is well
(see <A
HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-INIT"
>the Section called <I
>Init function</I
></A
>).
The hardware should be totally initialized
(<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>not</I
></SPAN
> &#8220;started&#8221;)
when this function is called.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="IO-ETH-DRV-TX-DONE">Callback Tx-Done function</H2
><P
><TABLE
BORDER="5"
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void (sc-&#62;funs-&#62;eth_drv-&#62;tx_done)(
		struct eth_drv_sc *sc,
		unsigned long key, int status)</PRE
></TD
></TR
></TABLE
>
This function is called when a packet completes transmission on the
interface.  The <TT
CLASS="PARAMETER"
><I
>key</I
></TT
>
value must be one of the keys provided to
<TT
CLASS="FUNCTION"
><TT
CLASS="REPLACEABLE"
><I
>HRDWR</I
></TT
>_send()</TT
>
above.  The value <TT
CLASS="PARAMETER"
><I
>status</I
></TT
> should be non-zero
(details currently undefined) to indicate that an error occurred during the
transmission, and zero if all was well.</P
><P
>It should be called from the deliver function
(see <A
HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-DELIVER"
>the Section called <I
>Deliver function</I
></A
>)
or poll function
(see <A
HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-POLL"
>the Section called <I
>Poll function</I
></A
>).</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="IO-ETH-DRV-UPPER-RECV">Callback Receive function</H2
><P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void (sc-&#62;funs-&#62;eth_drv-&#62;recv)(struct eth_drv_sc *sc, int len)</PRE
></TD
></TR
></TABLE
>
This function is called to indicate that a packet of length
<TT
CLASS="PARAMETER"
><I
>len</I
></TT
> has
arrived at the interface.
The callback
<TT
CLASS="FUNCTION"
><TT
CLASS="REPLACEABLE"
><I
>HRDWR</I
></TT
>_recv()</TT
> function
described above will be used to actually unload the data from the
interface into buffers used by the device independent layers.</P
><P
>It should be called from the deliver function
(see <A
HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-DELIVER"
>the Section called <I
>Deliver function</I
></A
>)
or poll function
(see <A
HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-POLL"
>the Section called <I
>Poll function</I
></A
>).</P
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