netdev - Re: [RFC PATCH bpf-next] bpf: Introduce bpf

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Message-ID: <87o8d1zn59.fsf@toke.dk>
Date:   Sun, 23 May 2021 13:48:34 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        davem@...emloft.net
Cc:     daniel@...earbox.net, andrii@...nel.org, john.fastabend@...il.com,
        lmb@...udflare.com, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...com
Subject: Re: [RFC PATCH bpf-next] bpf: Introduce bpf_timer

Still wrapping my head around this, but one thing immediately sprang to
mind:

> + * long bpf_timer_mod(struct bpf_timer *timer, u64 msecs)
> + *	Description
> + *		Set the timer expiration N msecs from the current time.
> + *	Return
> + *		zero

Could we make this use nanoseconds (and wire it up to hrtimers) instead?
I would like to eventually be able to use this for pacing out network
packets, and msec precision is way too coarse for that...

-Toke