[Bug 199174] em tx and rx hang

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199174

--- Comment #11 from Sean Bruno <sbruno at FreeBSD.org> ---
Did a couple of tests via iperf.

test 1
#1 set hw.em.txd="4096"
#2 set hw.em.rxd="4096"
#3 ran with TSO enabled
-- ran into hangs and debug output from watchdog as reporter and stated.
-- seems to happen less frequently, once in 24 hour test

test 2
#1 setup as test 1
#2 disable TSO (ifconfig em0 -tso)
-- no hangs in 24 hours test

test 3
#1 set hw.em.txd="256"
#2 set hw.em.rxd="256"
#3 reboot and leave TSO enabled
-- ran into hangs and debug out from watchdog in minutes

Hypothesis:
 -- TSO implementation isn't taking into consideration ring wrap events?

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