kern/153244: em(4) failes to send UDP to port 0xffff

[Daniel Braniss]

>Number:         153244
>Category:       kern
>Synopsis:       em(4) failes to send UDP to port 0xffff
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Dec 17 10:20:06 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Braniss
>Release:        FreeBSD 8.1-STABLE amd64
>Organization:
>Environment:
System:FreeBSD pampa 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #12 r4245: Fri Dec 10 09:12:57 IST 2010     danny at rnd:/home/obj/rnd/r+d/stable/8/sys/HUJI  amd64
	
>Description:
	with TXCSUM on, the em failes to send a UDP packet to port (short)-1 (0xffff)
>How-To-Repeat:
	nc -u some-host 65535
	and watch via wireshark
>Fix:
	workaround: ifconfig em0 -txcsum
>Release-Note:
>Audit-Trail:
>Unformatted: