Manual Pages for UNIX Operating System command usage for man mac_lso_get

Kernel Functions for Drivers                      mac_lso_get(9F)



NAME
     mac_lso_get - LSO routine

SYNOPSIS
     #include 

     void mac_lso_get(mblk_t *mp, uint32_t *mss, uint32_t *flags);


DESCRIPTION
     LSO (Large Segment Offload, or Large  Send  Offload)  allows
     the network stack to send larger buffers to a device driver.
     These large buffers can then segmented in hardware, allowing
     for  reduced  CPU  utilization,  PCI  overhead,  and reduced
     buffer management costs.


     LSO is enabled only for device driver instances that  adver-
     tise  support  for  the MAC_CAPAB_LSO capability through the
     mc_getcapab(9E) entry point.


     Once a device driver advertises the LSO capability, it  must
     use  the mac_lso_get() entry point to query whether LSO must
     be performed on the packet. The  following  values  for  the
     flags argument are supported:

     HW_LSO    When set, this flag indicates that LSO is  enabled
               for that packet. The maximum segment size (MSS) to
               be used during segmentation of the  large  segment
               is  returned  through  the  location pointed to by
               mss.


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



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


SEE ALSO
     attributes(5), mac(9E)




SunOS 5.11          Last change: 26 Mar 2010                    1