netdev - Re: [PATCH net-next v2] bnxt

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Message-ID: <CACKFLind_tASqzQHUKi-ifg7S-MpZE0MCv==bmwVOru+n5xK_Q@mail.gmail.com>
Date: Thu, 14 Nov 2024 13:40:56 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: Vadim Fedorenko <vadfed@...a.com>
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>, Pavan Chebbi <pavan.chebbi@...adcom.com>, 
	Andrew Lunn <andrew+netdev@...n.ch>, Paolo Abeni <pabeni@...hat.com>, 
	Jakub Kicinski <kuba@...nel.org>, Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net-next v2] bnxt_en: optimize gettimex64

On Thu, Nov 14, 2024 at 3:48 AM Vadim Fedorenko <vadfed@...a.com> wrote:
>
> Current implementation of gettimex64() makes at least 3 PCIe reads to
> get current PHC time. It takes at least 2.2us to get this value back to
> userspace. At the same time there is cached value of upper bits of PHC
> available for packet timestamps already. This patch reuses cached value
> to speed up reading of PHC time.
>
> Signed-off-by: Vadim Fedorenko <vadfed@...a.com>
> ---
> v1 -> v2:
> * move cycles extension to a helper function and reuse it for both
>   timestamp extension and gettimex64() function

Thanks.
Reviewed-by: Michael Chan <michael.chan@...adcom.com>

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