TSO for em(4) committed to -current

Following the
recent CFT,
Marcus Glocker (mglocker@) has
committed
[to -current]
TSO for
em(4):

CVSROOT:	/cvs
Module name:	src
Changes by:	mglocker@cvs.openbsd.org	2023/12/31 01:42:33

Modified files:
	sys/dev/pci    : if_em.c if_em.h if_em_hw.h 

Log message:
Add TCP Segmentation Offload (TSO) support for em(4).  Following chip-sets
are currently known to support TSO;  82575, 82576, 82580, I350, and I210.

Suggested by claudio@.  Feedback and testing from many on tech@.

This means that those of us with supported em(4) variants can look forward to measurably improved network performance.

Well done, mglocker@ and all those who tested!