netdev - Re: [PATCH net-next v3 1/7] bnxt_en: add support for rx-copybreak ethtool command

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Message-ID: <CACKFLi=1h=GBq5bN7L1pq9w8cSiHA16CZz0p8HJoGdO+_5OqFw@mail.gmail.com>
Date: Thu, 3 Oct 2024 10:13:59 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: Taehee Yoo <ap420073@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	edumazet@...gle.com, almasrymina@...gle.com, netdev@...r.kernel.org, 
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	bcreeley@....com
Subject: Re: [PATCH net-next v3 1/7] bnxt_en: add support for rx-copybreak
 ethtool command

On Thu, Oct 3, 2024 at 9:06 AM Taehee Yoo <ap420073@...il.com> wrote:
>
> The bnxt_en driver supports rx-copybreak, but it couldn't be set by
> userspace. Only the default value(256) has worked.
> This patch makes the bnxt_en driver support following command.
> `ethtool --set-tunable <devname> rx-copybreak <value> ` and
> `ethtool --get-tunable <devname> rx-copybreak`.
>
> Signed-off-by: Taehee Yoo <ap420073@...il.com>
> ---
>
> v3:
>  - Update copybreak value before closing nic.
>
> v2:
>  - Define max/vim rx_copybreak value.
>
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 24 +++++----
>  drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  6 ++-
>  .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 49 ++++++++++++++++++-
>  3 files changed, 68 insertions(+), 11 deletions(-)
>

> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> index 69231e85140b..cff031993223 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> @@ -34,6 +34,10 @@
>  #include <linux/firmware/broadcom/tee_bnxt_fw.h>
>  #endif
>
> +#define BNXT_DEFAULT_RX_COPYBREAK 256
> +#define BNXT_MIN_RX_COPYBREAK 65
> +#define BNXT_MAX_RX_COPYBREAK 1024
> +

Sorry for the late review.  Perhaps we should also support a value of
zero which means to disable RX copybreak.

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