Kernel Functions for Drivers            netispartialchecksum(9F)



NAME
     netispartialchecksum  -  indicate  if  a  packet  is  being
     scheduled for hardware checksum calculation

SYNOPSIS
     #include 

     int netispartialchecksum(const netdatat net, mblkt *mb);


INTERFACE LEVEL
     Solaris DI specific (Solaris DI).

PARAMETERS
     net    value   returned   from   a   successful   call    to
            netprotocollookup(9F).


     mb    the mblk structure holding a packet that is  the  sub-
           ject of this query.


DESCRIPTION
     The netispartialchecksum() function  looks  at  the  fields
     within  the  mblk  structure to determine if the packet con-
     tained inside contains headers with  only  partial  checksum
     values.  Partial  checksum  values are stored inside headers
     when the calculation of the complete checksum is being  han-
     dled by the hardware.

RETURN VALUES
     The netispartialchecksum() function returns:

     -1    The network protocol does not support this function.


     0     The packet does not contain partial checksums.



     If a packet is marked for hardware checksum'ing, the follow-
     ing values are returned:

     NETHCKL3FUL    Complete layer 3 checksum calculated


     NETHCKL3PART    Partial layer 3 checksum calculated


     NETHCKL4FUL    Complete layer 4 checksum calculated





SunOS 5.11           Last change: 1 May 2008                    1






Kernel Functions for Drivers            netispartialchecksum(9F)



     NETHCKL4PART    Partial layer 4 checksum calculated


CONTEXT
     The netispartialchecksum()  function  may  be  called  from
     user,  kernel, or interrupt context.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Availability                 SUNWcsu                     
    
     Interface Stability          Committed                   
    


SEE ALSO
     netisvalidchecksum(9F),   netprotocollookup(9F),   attri-
     butes(5)






























SunOS 5.11           Last change: 1 May 2008                    2