linux-kernel - Re: [EXT] Re: [net PATCH] octeon_ep: update BQL sent bytes before ringing doorbell

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Message-ID: <PH0PR18MB47342FEB8D57162EE5765E3CC7D3A@PH0PR18MB4734.namprd18.prod.outlook.com>
Date:   Thu, 12 Oct 2023 10:00:05 +0000
From:   Shinas Rasheed <srasheed@...vell.com>
To:     Paolo Abeni <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Haseeb Gani <hgani@...vell.com>
CC:     Vimlesh Kumar <vimleshk@...vell.com>,
        "egallen@...hat.com" <egallen@...hat.com>,
        "mschmidt@...hat.com" <mschmidt@...hat.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        Sathesh B Edara <sedara@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Satananda Burla <sburla@...vell.com>,
        Abhijit Ayarekar <aayarekar@...vell.com>
Subject: Re: [EXT] Re: [net PATCH] octeon_ep: update BQL sent bytes before
 ringing doorbell


Hi,

If tx completion and start_xmit happen on 2 different CPUs, how do you
ensure that xmit_completion will observe the values written here?

Specifically, don't you need to move netdev_tx_sent_queue() before the
above memory barrier?

>>> Yes, you are correct. I'll update the changeset. Thank you.