net_ispartialchecksum(9F)				   Kernel Functions for Drivers 				 net_ispartialchecksum(9F)

NAME

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

SYNOPSIS

       #include <sys/neti.h>

       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 subject of this query.

DESCRIPTION

       The  net_ispartialchecksum()  function  looks  at the fields within the mblk structure to determine if the packet contained inside contains
       headers with only partial checksum values. Partial checksum values are stored inside headers when the calculation of the complete  checksum
       is being handled 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 following 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

       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 attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       net_isvalidchecksum(9F), net_protocol_lookup(9F), attributes(5)

SunOS 5.11							    1 May 2008						 net_ispartialchecksum(9F)