CFT: gem(4) checksum offload support

[Peter Grehan]

Hi,

  I get a compile error for this on ppc:

/usr/home/grehan/freebsd/dev_head/src/sys/dev/gem/if_gem.c: In function 
`gem_txdma_callback':
/usr/home/grehan/freebsd/dev_head/src/sys/dev/gem/if_gem.c:92: warning: 
inlining failed in call to 'gem_txcksum': function body not available
/usr/home/grehan/freebsd/dev_head/src/sys/dev/gem/if_gem.c:505: warning: 
called from here
*** Error code 1

  Removing the __inline's fixed it, as I guess would re-ordering.

later,

Peter.