netdev - Re: [PATCH bpf-next v4 1/8] ice: remove likely for napi_complete

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Message-ID: <CAJ8uoz3R1zzqmRO66TVUHEhBJvTd7Lsmf-OZw7aWSE+ZWdgngg@mail.gmail.com>
Date:   Tue, 25 Jan 2022 09:59:32 +0100
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>
Subject: Re: [PATCH bpf-next v4 1/8] ice: remove likely for napi_complete_done

On Mon, Jan 24, 2022 at 8:38 PM Maciej Fijalkowski
<maciej.fijalkowski@...el.com> wrote:
>
> Remove the likely before napi_complete_done as this is the unlikely case
> when busy-poll is used. Removing this has a positive performance impact
> for busy-poll and no negative impact to the regular case.

Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_txrx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
> index 3e38695f1c9d..e661d0e45b9b 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
> @@ -1513,7 +1513,7 @@ int ice_napi_poll(struct napi_struct *napi, int budget)
>         /* Exit the polling mode, but don't re-enable interrupts if stack might
>          * poll us due to busy-polling
>          */
> -       if (likely(napi_complete_done(napi, work_done))) {
> +       if (napi_complete_done(napi, work_done)) {
>                 ice_net_dim(q_vector);
>                 ice_enable_interrupt(q_vector);
>         } else {
> --
> 2.33.1
>