Manual Pages for UNIX Operating System command usage for man net_ispartialchecksum

Kernel Functions for Drivers            net_ispartialchecksum(9F)



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

SYNOPSIS
     #include 

     int net_ispartialchecksum(const net_data_t net, mblk_t *mb);


INTERFACE LEVEL
     Solaris DDI specific (Solaris DDI).

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


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


DESCRIPTION
     The net_ispartialchecksum() 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 net_ispartialchecksum() 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:

     NET_HCK_L3_FULL    Complete layer 3 checksum calculated


     NET_HCK_L3_PART    Partial layer 3 checksum calculated


     NET_HCK_L4_FULL    Complete layer 4 checksum calculated





SunOS 5.11           Last change: 1 May 2008                    1






Kernel Functions for Drivers            net_ispartialchecksum(9F)



     NET_HCK_L4_PART    Partial layer 4 checksum calculated


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

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



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcs                      |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|


SEE ALSO
     net_isvalidchecksum(9F),   net_protocol_lookup(9F),   attri-
     butes(5)






























SunOS 5.11           Last change: 1 May 2008                    2