like the mlx-c5 and c6 that require a "setup" routine before the tcp_ratelimit code can declare and use a rate. I add the setup routine to if_var as well as fix tcp_ratelimit to call it. I also revisit the rates so that in the case of a mlx card of type c5/6 we will use about 100 rates concentrated in the range where the most gain can be had (1-200Mbps). Note that I have tested these on a c5 and they work and perform well. In fact in an unloaded system they pace right to the correct rate (great job mlx!). There will be a further commit here from Hans that will add the respective changes to the mlx driver to support this work (which I was testing with). Sponsored by: Netflix Inc. Differential Revision: ttps://reviews.freebsd.org/D23647
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