Received-SPF: pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Sender: Vincent Mailhol <vincent.mailhol@gmail.com>
From:   Vincent Mailhol <mailhol.vincent@wanadoo.fr>
To:     Jiri Pirko <jiri@nvidia.com>, netdev@vger.kernel.org,
        Jakub Kicinski <kuba@kernel.org>
Cc:     "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>, linux-kernel@vger.kernel.org,
        Boris Brezillon <bbrezillon@kernel.org>,
        Arnaud Ebalard <arno@natisbad.org>,
        Srujana Challa <schalla@marvell.com>,
        Kurt Kanzenbach <kurt@linutronix.de>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        Michael Chan <michael.chan@broadcom.com>,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Dimitris Michailidis <dmichail@fungible.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        Sunil Goutham <sgoutham@marvell.com>,
        Linu Cherian <lcherian@marvell.com>,
        Geetha sowjanya <gakula@marvell.com>,
        Jerin Jacob <jerinj@marvell.com>,
        hariprasad <hkelam@marvell.com>,
        Subbaraya Sundeep <sbhatta@marvell.com>,
        Taras Chornyi <tchornyi@marvell.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        Ido Schimmel <idosch@nvidia.com>,
        Petr Machata <petrm@nvidia.com>,
        Simon Horman <simon.horman@corigine.com>,
        Shannon Nelson <snelson@pensando.io>, drivers@pensando.io,
        Ariel Elior <aelior@marvell.com>,
        Manish Chopra <manishc@marvell.com>,
        Jonathan Lemon <jonathan.lemon@gmail.com>,
        Vadim Fedorenko <vadfed@fb.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Vadim Pasternak <vadimp@mellanox.com>,
        Shalom Toledo <shalomt@mellanox.com>,
        linux-crypto@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
        linux-rdma@vger.kernel.org, oss-drivers@corigine.com,
        Jiri Pirko <jiri@mellanox.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Hao Chen <chenhao288@hisilicon.com>,
        Guangbin Huang <huangguangbin2@huawei.com>,
        Minghao Chi <chi.minghao@zte.com.cn>,
        Shijith Thotton <sthotton@marvell.com>,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Subject: [PATCH net-next v5 3/4] net: devlink: make the devlink_ops::info_get() callback optional
Date:   Tue, 29 Nov 2022 09:05:49 +0900
Message-Id: <20221129000550.3833570-4-mailhol.vincent@wanadoo.fr>
In-Reply-To: <20221129000550.3833570-1-mailhol.vincent@wanadoo.fr>
References: <20221129000550.3833570-1-mailhol.vincent@wanadoo.fr>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Some drivers only reported the driver name in their
devlink_ops::info_get() callback. Now that the core provides this
information, the callback became empty. For such drivers, just
removing the callback would prevent the core from executing
devlink_nl_info_fill() meaning that "devlink dev info" would not
return anything.

Make the callback function optional by executing
devlink_nl_info_fill() even if devlink_ops::info_get() is NULL.

N.B.: the drivers with devlink support which previously did not
implement devlink_ops::info_get() will now also be able to report
the driver name.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
 net/core/devlink.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 3babc16eeb6b..817d978bb729 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6773,9 +6773,11 @@ devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
 		goto err_cancel_msg;
 
 	req.msg = msg;
-	err = devlink->ops->info_get(devlink, &req, extack);
-	if (err)
-		goto err_cancel_msg;
+	if (devlink->ops->info_get) {
+		err = devlink->ops->info_get(devlink, &req, extack);
+		if (err)
+			goto err_cancel_msg;
+	}
 
 	err = devlink_nl_driver_info_get(dev->driver, &req);
 	if (err)
@@ -6796,9 +6798,6 @@ static int devlink_nl_cmd_info_get_doit(struct sk_buff *skb,
 	struct sk_buff *msg;
 	int err;
 
-	if (!devlink->ops->info_get)
-		return -EOPNOTSUPP;
-
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
@@ -6824,7 +6823,7 @@ static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
 	int err = 0;
 
 	devlinks_xa_for_each_registered_get(sock_net(msg->sk), index, devlink) {
-		if (idx < start || !devlink->ops->info_get)
+		if (idx < start)
 			goto inc;
 
 		devl_lock(devlink);
-- 
2.25.1