packet filtering via Chelsio NICs

mike tancsa mike at
Mon Aug 17 13:13:57 UTC 2020

Has anyone used the packet filtering features of the T520 and T540 cards
on FreeBSD ? Rather than use ipfw or pf, I am hoping to offload some of
the packet filtering to the features on the card. Does it save CPU
processing power in the end ? Is there a sweet spot to using it, or am I
better off using ipfw ? I am looking at dropping traffic in the 2-5Gb/s
range filtering out bogons and other bad packets.

Would appreciate any examples / caveats / tip on how to use it as the
docs are kind of sparse. Using it on RELENG_12


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