linux-kernel - RE: [Intel-wired-lan] [PATCH v2] i40e: drop useless bitmap_weight() call in i40e_set_rxfh

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Message-ID: <IA1PR11MB6241A70092AAA30A3671AC708B90A@IA1PR11MB6241.namprd11.prod.outlook.com>
Date: Tue, 27 Jan 2026 06:22:49 +0000
From: "Rinitha, SX" <sx.rinitha@...el.com>
To: "Yury Norov (NVIDIA)" <yury.norov@...il.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH v2] i40e: drop useless bitmap_weight()
 call in i40e_set_rxfh_fields()

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Yury Norov (NVIDIA)
> Sent: 18 December 2025 07:28
> To: Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; Andrew Lunn <andrew+netdev@...n.ch>; David S. Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: Yury Norov (NVIDIA) <yury.norov@...il.com>; Loktionov, Aleksandr <aleksandr.loktionov@...el.com>
> Subject: [Intel-wired-lan] [PATCH v2] i40e: drop useless bitmap_weight() call in i40e_set_rxfh_fields()
>
> bitmap_weight() is O(N) and useless here, because the following
> for_each_set_bit() returns immediately in case of empty flow_pctypes.
>
> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
> ---
> v1: https://lore.kernel.org/all/20251216002852.334561-1-yury.norov@gmail.com/
> v2: don't drop flow_id (Aleksandr).
>
> .../net/ethernet/intel/i40e/i40e_ethtool.c    | 21 +++++++------------
> 1 file changed, 8 insertions(+), 13 deletions(-)
>

Tested-by: Rinitha S <sx.rinitha@...el.com> (A Contingent worker at Intel)