MFC r336718, r336720, r336734-r336735, r337398, r337439, and r337540.
These are all related to tx rate limiting in cxgbe.

r336718:
cxgbe(4): Validate only those parameters that are relevant to the
type of rate limiter being programmed. Skip the ones that are not
applicable.

Sponsored by: Chelsio Communications

r336720:
cxgbe(4): Remove useless code that crept in with r336718.

X-MFC With: 336718

r336734:
cxgbe(4): Better defaults for all cl-rl rate limiters.

Start in "class" instead of "flow" mode. This eliminates the need to
specify an MTU, which is not available that early anyway. It also
allows the user to manually configure ch-rl rate limiting after attach.
This used to fail because ch-rl isn't supported if cl-rl "flow" mode is
configured.

Set all traffic classes to 1Gbps during initialization. The goal is to
start off with _any_ valid configuration and 1Gbps works even for
gigabit cards.

Sponsored by: Chelsio Communications

r336735:
cxgbe(4): Consider rateunit before ratemode when displaying information
about a traffic class. This matches the order in which the firmware
evaluates unit and mode internally.

Sponsored by: Chelsio Communications

r337398:
cxgbe(4): Allow user-configured and driver-configured traffic classes to
be used simultaneously. Move sysctl_tc and sysctl_tc_params to
t4_sched.c while here.

Sponsored by: Chelsio Communications

r337439:
cxgbe(4): Allow the driver to specify a burst size when configuring a
traffic class for rate limiting.

Add experimental knobs that allow the user to specify a default pktsize
and burstsize for traffic classes associated with a port:

dev.<ifname>.<instance>.tc.pktsize
dev.<ifname>.<instance>.tc.burstsize

Sponsored by: Chelsio Communications

r337540:
cxgbe(4): Display pkt-size and burst-size in traffic class parameters.