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Message-ID: <a0f3166c-b520-d3db-6131-fb29809463a9@linux.intel.com>
Date: Tue, 4 Jul 2023 08:28:56 +0300
From: "naamax.meir" <naamax.meir@...ux.intel.com>
To: Florian Kauer <florian.kauer@...utronix.de>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
Vinicius Costa Gomes <vinicius.gomes@...el.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Tan Tee Min <tee.min.tan@...ux.intel.com>,
Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
Aravindhan Gunasekaran <aravindhan.gunasekaran@...el.com>,
Malli C <mallikarjuna.chilakala@...el.com>
Cc: netdev@...r.kernel.org, kurt@...utronix.de,
intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-wired-lan] [PATCH net v2 3/6] igc: Handle already enabled
taprio offload for basetime 0
On 6/19/2023 13:08, Florian Kauer wrote:
> Since commit e17090eb2494 ("igc: allow BaseTime 0 enrollment for Qbv")
> it is possible to enable taprio offload with a basetime of 0.
> However, the check if taprio offload is already enabled for i225
> (and thus -EALREADY should be returned for igc_save_qbv_schedule)
> still relied on adapter->base_time > 0.
>
> This can be reproduced as follows:
>
> # TAPRIO offload (flags == 0x2) and base-time = 0
> sudo tc qdisc replace dev enp1s0 parent root handle 100 stab overhead 24 taprio \
> num_tc 1 \
> map 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 \
> queues 1@0 \
> base-time 0 \
> sched-entry S 01 300000 \
> flags 0x2
>
> # The second call should fail with "Error: Device failed to setup taprio offload."
> # But that only happens if base-time was != 0
> sudo tc qdisc replace dev enp1s0 parent root handle 100 stab overhead 24 taprio \
> num_tc 1 \
> map 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 \
> queues 1@0 \
> base-time 0 \
> sched-entry S 01 300000 \
> flags 0x2
>
> Fixes: e17090eb2494 ("igc: allow BaseTime 0 enrollment for Qbv")
> Signed-off-by: Florian Kauer <florian.kauer@...utronix.de>
> Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---
> drivers/net/ethernet/intel/igc/igc_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Tested-by: Naama Meir <naamax.meir@...ux.intel.com>
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