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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><TITLE
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>Upper Layer Functions</TITLE
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TITLE="eCos Reference Manual"
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TITLE="Generic Ethernet Device Driver"
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>eCos Reference Manual</TH
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><A
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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>Chapter 46. Generic Ethernet Device Driver</TD
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="IO-ETH-DRV-UPPER-API">Upper Layer Functions</H1
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><P
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>Upper layer functions are called by drivers to deliver received packets
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or transmission completion status back up into the network stack.</P
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><P
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>These functions are defined by the hardware independent upper layers of
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the networking driver support.  They are present to hide the interfaces
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to the actual networking stack so that the hardware drivers may
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be used by different network stack implementations without change.</P
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><P
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>These functions require a pointer to a <SPAN
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CLASS="TYPE"
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>struct eth_drv_sc</SPAN
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>
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which describes the interface at a logical level.  It is assumed that the
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low level hardware driver will keep track of this pointer so
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it may be passed &#8220;up&#8221; as appropriate.</P
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><DIV
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CLASS="SECT2"
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><H2
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><A
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NAME="IO-ETH-DRV-UPPER-INIT">Callback Init function</H2
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><P
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><TABLE
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>void (sc-&#62;funs-&#62;eth_drv-&#62;init)(
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                struct eth_drv_sc *sc, unsigned char *enaddr)</PRE
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></TD
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></TR
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></TABLE
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>
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This function establishes the device at initialization time.
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It should be called once per device instance only, from the
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initialization function, if all is well
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(see <A
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HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-INIT"
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>the Section called <I
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>Init function</I
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></A
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>).
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The hardware should be totally initialized
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(<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>not</I
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></SPAN
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> &#8220;started&#8221;)
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when this function is called.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="IO-ETH-DRV-TX-DONE">Callback Tx-Done function</H2
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><P
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>void (sc-&#62;funs-&#62;eth_drv-&#62;tx_done)(
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                struct eth_drv_sc *sc,
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                unsigned long key, int status)</PRE
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></TD
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></TR
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></TABLE
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>
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This function is called when a packet completes transmission on the
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interface.  The <TT
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CLASS="PARAMETER"
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><I
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>key</I
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></TT
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>
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value must be one of the keys provided to
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<TT
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><TT
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CLASS="REPLACEABLE"
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><I
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>HRDWR</I
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></TT
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>_send()</TT
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>
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above.  The value <TT
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CLASS="PARAMETER"
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><I
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>status</I
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></TT
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> should be non-zero
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(details currently undefined) to indicate that an error occurred during the
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transmission, and zero if all was well.</P
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><P
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>It should be called from the deliver function
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(see <A
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HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-DELIVER"
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>the Section called <I
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>Deliver function</I
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></A
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>)
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or poll function
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(see <A
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HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-POLL"
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>the Section called <I
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>Poll function</I
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></A
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>).</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="IO-ETH-DRV-UPPER-RECV">Callback Receive function</H2
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><P
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><PRE
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>void (sc-&#62;funs-&#62;eth_drv-&#62;recv)(struct eth_drv_sc *sc, int len)</PRE
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></TD
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></TR
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></TABLE
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>
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This function is called to indicate that a packet of length
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<TT
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CLASS="PARAMETER"
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><I
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>len</I
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></TT
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> has
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arrived at the interface.
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The callback
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<TT
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CLASS="FUNCTION"
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><TT
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CLASS="REPLACEABLE"
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><I
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>HRDWR</I
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></TT
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>_recv()</TT
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> function
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described above will be used to actually unload the data from the
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interface into buffers used by the device independent layers.</P
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><P
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>It should be called from the deliver function
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(see <A
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HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-DELIVER"
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>the Section called <I
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>Deliver function</I
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></A
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>)
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or poll function
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(see <A
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HREF="io-eth-drv-api-funcs.html#IO-ETH-DRV-API-POLL"
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>the Section called <I
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>Poll function</I
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></A
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>).</P
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