netdev - [PATCH net-next 02/21] ethtool, stats: add compile-time checks for standard stats

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Date:   Tue,  3 Aug 2021 18:36:22 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Lukasz Czapnik <lukasz.czapnik@...el.com>,
        Marcin Kubiak <marcin.kubiak@...el.com>,
        Michal Kubiak <michal.kubiak@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Netanel Belgazal <netanel@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        Guy Tzalik <gtzalik@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Shay Agroskin <shayagr@...zon.com>,
        Sameeh Jubran <sameehj@...zon.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Danielle Ratson <danieller@...dia.com>,
        Ido Schimmel <idosch@...dia.com>, Andrew Lunn <andrew@...n.ch>,
        Vladyslav Tarasiuk <vladyslavt@...dia.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jian Shen <shenjian15@...wei.com>,
        Petr Vorel <petr.vorel@...il.com>, Dan Murphy <dmurphy@...com>,
        Yangbo Lu <yangbo.lu@....com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Zheng Yongjun <zhengyongjun3@...wei.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Johannes Berg <johannes@...solutions.net>,
        netdev@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: [PATCH net-next 02/21] ethtool, stats: add compile-time checks for standard stats

Make sure that the number of counters inside stats structures is
with the corresponding Ethtool Netlink definitions.
RMON stats is a special case -- don't take histogram fields into
account.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
---
 net/ethtool/stats.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/ethtool/stats.c b/net/ethtool/stats.c
index e35c87206b4c..8b5c27e034f9 100644
--- a/net/ethtool/stats.c
+++ b/net/ethtool/stats.c
@@ -117,6 +117,15 @@ static int stats_prepare_data(const struct ethnl_req_info *req_base,
 
 	ops = dev->ethtool_ops;
 
+	BUILD_BUG_ON(sizeof(data->phy_stats) / sizeof(u64) !=
+		     __ETHTOOL_A_STATS_ETH_PHY_CNT);
+	BUILD_BUG_ON(sizeof(data->mac_stats) / sizeof(u64) !=
+		     __ETHTOOL_A_STATS_ETH_MAC_CNT);
+	BUILD_BUG_ON(sizeof(data->ctrl_stats) / sizeof(u64) !=
+		     __ETHTOOL_A_STATS_ETH_CTRL_CNT);
+	BUILD_BUG_ON(offsetof(typeof(data->rmon_stats), hist) / sizeof(u64) !=
+		     __ETHTOOL_A_STATS_RMON_CNT);
+
 	/* Mark all stats as unset (see ETHTOOL_STAT_NOT_SET) to prevent them
 	 * from being reported to user space in case driver did not set them.
 	 */
-- 
2.31.1