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b=Gpb4oegQ0coBIBM3ZWW/WpaeaMhPt0yPBi+WTZWqOqUqhppPHy734euH4mwL+78H7sHCvq 0ANkNlcCoHLXZOwaZHlzlYUcRwKrSC09UDWFEGBfKbSu3spc8Ka95ykhhwMrvdSIOL74dS rcO+EkhKob04QplJ2jtGL10y3UJxarW8Jega5Va+qqZmXhY1QKq0sTj2BrKLS9hBFraGpe QiiuR4YIgazL1uJHL6BMDAqlrMKtQ1Gb77DBouHftmMco+zmyi2KqZ24lm0LnZPsMS5Ulh kBBUBQ/AtibuODr1FhyKO6difcanpvR6TaINtHBu6hbM4pyhJZ6x/xrePqxjhQ== From: Maxime Chevallier To: davem@davemloft.net, Andrew Lunn , Jakub Kicinski , Eric Dumazet , Paolo Abeni , Heiner Kallweit Cc: Maxime Chevallier , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, linux-arm-kernel@lists.infradead.org, Christophe Leroy , Herve Codina , Florian Fainelli , Russell King , Vladimir Oltean , =?UTF-8?q?K=C3=B6ry=20Maincent?= , Oleksij Rempel , Simon Horman , Romain Gantois , Piergiorgio Beruto , Stanislav Fomichev Subject: [PATCH net-next v2 1/7] net: ethtool: netlink: Allow per-netdevice DUMP operations Date: Sat, 8 Mar 2025 16:54:33 +0100 Message-ID: <20250308155440.267782-2-maxime.chevallier@bootlin.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250308155440.267782-1-maxime.chevallier@bootlin.com> References: <20250308155440.267782-1-maxime.chevallier@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdduudefleeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeforgigihhmvgcuvehhvghvrghllhhivghruceomhgrgihimhgvrdgthhgvvhgrlhhlihgvrhessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepveegtdffleffleevueellefgjeefvedvjefhheegfefgffdvfeetgeevudetffdtnecukfhppedvrgdtudemtggsudelmeekugegtgemlehftddtmegstgdvudemkeekleelmeehgedttgemvgehlegvnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvdgrtddumegtsgduleemkegugegtmeelfhdttdemsggtvddumeekkeelleemheegtdgtmegvheelvgdphhgvlhhopehfvgguohhrrgdrhhhomhgvpdhmrghilhhfrhhomhepmhgrgihimhgvrdgthhgvvhgrlhhlihgvrhessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepvddvpdhrtghpthhtohepuggrvhgvmhesuggrvhgvmhhlohhfthdrnhgvthdprhgtphhtthhopegrnhgurhgvfieslhhunhhnrdgthhdprhgtphhtthhopehkuhgsrgeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepvgguuhhmr giivghtsehgohhoghhlvgdrtghomhdprhgtphhtthhopehprggsvghnihesrhgvughhrghtrdgtohhmpdhrtghpthhtohephhhkrghllhifvghithdusehgmhgrihhlrdgtohhmpdhrtghpthhtohepmhgrgihimhgvrdgthhgvvhgrlhhlihgvrhessghoohhtlhhinhdrtghomhdprhgtphhtthhopehnvghtuggvvhesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-GND-Sasl: maxime.chevallier@bootlin.com Content-Type: text/plain; charset="utf-8" We have a number of netlink commands in the ethnl family that may have multiple objects to dump even for a single net_device, including : - PLCA, PSE-PD, phy: one message per PHY device - tsinfo: one message per timestamp source (netdev + phys) - rss: One per RSS context To get this behaviour, these netlink commands need to roll a custom ->dumpit(). To prepare making per-netdev DUMP more generic in ethnl, introduce a member in the ethnl ops to indicate if a given command may allow pernetdev DUMPs (also referred to as filtered DUMPs). Signed-off-by: Maxime Chevallier --- V2: - Rebase - Fix kdoc - Fix bissectabilitu by using the right function names net/ethtool/netlink.c | 45 ++++++++++++++++++++++++++++--------------- net/ethtool/netlink.h | 2 ++ 2 files changed, 31 insertions(+), 16 deletions(-) diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c index 70834947f474..11e4122b7707 100644 --- a/net/ethtool/netlink.c +++ b/net/ethtool/netlink.c @@ -586,21 +586,34 @@ static int ethnl_default_dumpit(struct sk_buff *skb, int ret =3D 0; =20 rcu_read_lock(); - for_each_netdev_dump(net, dev, ctx->pos_ifindex) { - dev_hold(dev); + if (ctx->req_info->dev) { + dev =3D ctx->req_info->dev; rcu_read_unlock(); - - ret =3D ethnl_default_dump_one(skb, dev, ctx, genl_info_dump(cb)); - + /* Filtered DUMP request targeted to a single netdev. We already + * hold a ref to the netdev from ->start() + */ + ret =3D ethnl_default_dump_one(skb, dev, ctx, + genl_info_dump(cb)); rcu_read_lock(); - dev_put(dev); - - if (ret < 0 && ret !=3D -EOPNOTSUPP) { - if (likely(skb->len)) - ret =3D skb->len; - break; + netdev_put(ctx->req_info->dev, &ctx->req_info->dev_tracker); + } else { + for_each_netdev_dump(net, dev, ctx->pos_ifindex) { + dev_hold(dev); + rcu_read_unlock(); + + ret =3D ethnl_default_dump_one(skb, dev, ctx, + genl_info_dump(cb)); + + rcu_read_lock(); + dev_put(dev); + + if (ret < 0 && ret !=3D -EOPNOTSUPP) { + if (likely(skb->len)) + ret =3D skb->len; + break; + } + ret =3D 0; } - ret =3D 0; } rcu_read_unlock(); =20 @@ -634,10 +647,10 @@ static int ethnl_default_start(struct netlink_callbac= k *cb) } =20 ret =3D ethnl_default_parse(req_info, &info->info, ops, false); - if (req_info->dev) { - /* We ignore device specification in dump requests but as the - * same parser as for non-dump (doit) requests is used, it - * would take reference to the device if it finds one + if (req_info->dev && !ops->allow_pernetdev_dump) { + /* We ignore device specification in unfiltered dump requests + * but as the same parser as for non-dump (doit) requests is + * used, it would take reference to the device if it finds one */ netdev_put(req_info->dev, &req_info->dev_tracker); req_info->dev =3D NULL; diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h index ec6ab5443a6f..4aaa73282d6a 100644 --- a/net/ethtool/netlink.h +++ b/net/ethtool/netlink.h @@ -331,6 +331,7 @@ int ethnl_sock_priv_set(struct sk_buff *skb, struct net= _device *dev, u32 portid, * @req_info_size: size of request info * @reply_data_size: size of reply data * @allow_nodev_do: allow non-dump request with no device identification + * @allow_pernetdev_dump: allow filtering dump requests with ifname/ifindex * @set_ntf_cmd: notification to generate on changes (SET) * @parse_request: * Parse request except common header (struct ethnl_req_info). Common @@ -388,6 +389,7 @@ struct ethnl_request_ops { unsigned int req_info_size; unsigned int reply_data_size; bool allow_nodev_do; + bool allow_pernetdev_dump; u8 set_ntf_cmd; =20 int (*parse_request)(struct ethnl_req_info *req_info, --=20 2.48.1