Let's take this opportunity to have a look at the NIC's side of BPF offload.
Note I don't know much about microcode and MicroC, but hopefully, if I make a mistake, someone from @Netronome can correct me.https://twitter.com/qeole/status/1162277443882766336 …
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hashmap_ops() first looks up the map (with hashmap_get_fd()) and the entry matching the key, then applies the hashmap operation. For example, in case of a lookup, it reads the hashmap entry in out_ent_addr with macro __hashmap_read_field(). https://github.com/Netronome/nic-firmware/blob/092d992f10fc8b4447baf352812f733de516b8b9/firmware/apps/nic/maps/hashmap.uc#L777-L784 …pic.twitter.com/stZ5Kn7TeO
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That's all I have for today (and until I get my hands on a microcode manual)!
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