netdev - Re: [PATCH v2 bpf-next 4/8] bpf: cpumap: add the possibility to attach an eBPF program to cpumap

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Message-ID: <20200623172323.603cf62c@carbon>
Date:   Tue, 23 Jun 2020 17:23:23 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, toke@...hat.com,
        lorenzo.bianconi@...hat.com, dsahern@...nel.org, brouer@...hat.com
Subject: Re: [PATCH v2 bpf-next 4/8] bpf: cpumap: add the possibility to
 attach an eBPF program to cpumap

On Sat, 20 Jun 2020 00:57:20 +0200
Lorenzo Bianconi <lorenzo@...nel.org> wrote:

> @@ -260,10 +322,11 @@ static int cpu_map_kthread_run(void *data)
>  		 * kthread CPU pinned. Lockless access to ptr_ring
>  		 * consume side valid as no-resize allowed of queue.
>  		 */
> -		n = ptr_ring_consume_batched(rcpu->queue, frames, CPUMAP_BATCH);
> +		n = ptr_ring_consume_batched(rcpu->queue, xdp_frames,
> +					     CPUMAP_BATCH);

This should have used the non-lock variant __ ptr_ring_consume_batched().
It did before, but I can see in git-history that this is this is a
bug/issue I introduced myself earlier... ups.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer