netdev - RE: [PATCH net-next v2 6/6] ice: sleep, don't busy-wait, in the SQ send retry loop

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Date:   Fri, 14 Apr 2023 17:29:02 +0000
From:   "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To:     mschmidt <mschmidt@...hat.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Kolacinski, Karol" <karol.kolacinski@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        Simon Horman <simon.horman@...igine.com>,
        "Michalik, Michal" <michal.michalik@...el.com>,
        poros <poros@...hat.com>, Andrew Lunn <andrew@...n.ch>
Subject: RE: [PATCH net-next v2 6/6] ice: sleep, don't busy-wait, in the SQ
 send retry loop

>From: Michal Schmidt <mschmidt@...hat.com>
>Sent: Wednesday, April 12, 2023 10:19 AM
>
>10 ms is a lot of time to spend busy-waiting. Sleeping is clearly
>allowed here, because we have just returned from ice_sq_send_cmd(),
>which takes a mutex.
>
>On kernels with HZ=100, this msleep may be twice as long, but I don't
>think it matters.
>I did not actually observe any retries happening here.
>
>Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
>---
> drivers/net/ethernet/intel/ice/ice_common.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/net/ethernet/intel/ice/ice_common.c
>b/drivers/net/ethernet/intel/ice/ice_common.c
>index c6200564304e..0157f6e98d3e 100644
>--- a/drivers/net/ethernet/intel/ice/ice_common.c
>+++ b/drivers/net/ethernet/intel/ice/ice_common.c
>@@ -1643,7 +1643,7 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct
>ice_ctl_q_info *cq,
>
> 		memcpy(desc, &desc_cpy, sizeof(desc_cpy));
>
>-		mdelay(ICE_SQ_SEND_DELAY_TIME_MS);
>+		msleep(ICE_SQ_SEND_DELAY_TIME_MS);
>
> 	} while (++idx < ICE_SQ_SEND_MAX_EXECUTE);
>
>--
>2.39.2

Looks good, thank you Michal!

Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>