netdev - Re: [RFCv4 PATCH net-next 1/3] net-next: ethtool: extend ringparam set/get APIs for tx

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Message-ID: <20220331202250.01f53929@kernel.org>
Date:   Thu, 31 Mar 2022 20:22:50 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jie Wang <wangjie125@...wei.com>
Cc:     <mkubecek@...e.cz>, <davem@...emloft.net>,
        <netdev@...r.kernel.org>, <huangguangbin2@...wei.com>,
        <lipeng321@...wei.com>, <shenjian15@...wei.com>,
        <moyufeng@...wei.com>, <linyunsheng@...wei.com>,
        <salil.mehta@...wei.com>, <chenhao288@...ilicon.com>
Subject: Re: [RFCv4 PATCH net-next 1/3] net-next: ethtool: extend ringparam
 set/get APIs for tx_push

On Thu, 31 Mar 2022 16:43:40 +0800 Jie Wang wrote:
> +``ETHTOOL_A_RINGS_TX_PUSH`` controls flag to choose the fast path or the
> +normal path to send packets. Setting tx push attribute "on" will enable tx
> +push mode and send packets in fast path. For those not supported hardwares,
> +this attributes is "off" by default settings.

You need to be more specific what a "fast path" is, that term is 
too general.

I presume you want to say something about the descriptor being written
directly into device address space... and that it lowers the latency
but increases the cost...