linux-kernel - Re: [PATCH v2 net-next 07/26] mvneta: add .ndo_get_xdp

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Message-ID: <YZ4kWXnqZQhSu+mw@shell.armlinux.org.uk>
Date:   Wed, 24 Nov 2021 11:39:05 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Shay Agroskin <shayagr@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        David Arinzon <darinzon@...zon.com>,
        Noam Dagan <ndagan@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Saeed Mahameed <saeedm@...dia.com>,
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        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        David Ahern <dsahern@...nel.org>,
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        Johannes Berg <johannes.berg@...el.com>,
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        Cong Wang <cong.wang@...edance.com>, netdev@...r.kernel.org,
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        linux-rdma@...r.kernel.org, bpf@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next 07/26] mvneta: add .ndo_get_xdp_stats()
 callback

On Tue, Nov 23, 2021 at 05:39:36PM +0100, Alexander Lobakin wrote:
> +	for_each_possible_cpu(cpu) {
> +		const struct mvneta_pcpu_stats *stats;
> +		const struct mvneta_stats *ps;
> +		u64 xdp_xmit_err;
> +		u64 xdp_redirect;
> +		u64 xdp_tx_err;
> +		u64 xdp_pass;
> +		u64 xdp_drop;
> +		u64 xdp_xmit;
> +		u64 xdp_tx;
> +		u32 start;
> +
> +		stats = per_cpu_ptr(pp->stats, cpu);
> +		ps = &stats->es.ps;
> +
> +		do {
> +			start = u64_stats_fetch_begin_irq(&stats->syncp);
> +
> +			xdp_drop = ps->xdp_drop;
> +			xdp_pass = ps->xdp_pass;
> +			xdp_redirect = ps->xdp_redirect;
> +			xdp_tx = ps->xdp_tx;
> +			xdp_tx_err = ps->xdp_tx_err;
> +			xdp_xmit = ps->xdp_xmit;
> +			xdp_xmit_err = ps->xdp_xmit_err;
> +		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
> +
> +		xdp_stats->drop += xdp_drop;
> +		xdp_stats->pass += xdp_pass;
> +		xdp_stats->redirect += xdp_redirect;
> +		xdp_stats->tx += xdp_tx;
> +		xdp_stats->tx_errors += xdp_tx_err;
> +		xdp_stats->xmit_packets += xdp_xmit;
> +		xdp_stats->xmit_errors += xdp_xmit_err;

Same comment as for mvpp2 - this could share a lot of code from
mvneta_ethtool_update_pcpu_stats() (although it means we end up
calculating a little more for the alloc error and refill error
that this API doesn't need) but I think sharing that code would be
a good idea.

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