[PATCH net-next v2 5/5] net: devlink: make the devlink_ops::info_get() callback optional

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,
	Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Subject: [PATCH net-next v2 5/5] net: devlink: make the devlink_ops::info_get() callback optional
Date: Sun, 27 Nov 2022 17:16:04 +0900	[thread overview]
Message-ID: <20221127081604.5242-6-mailhol.vincent@wanadoo.fr> (raw)
In-Reply-To: <20221127081604.5242-1-mailhol.vincent@wanadoo.fr>

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.

Remove all the empty devlink_ops::info_get() functions from the
drivers.

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/ethernet/fungible/funeth/funeth_devlink.c   |  7 -------
 .../net/ethernet/marvell/octeontx2/af/rvu_devlink.c |  7 -------
 .../ethernet/marvell/octeontx2/nic/otx2_devlink.c   |  8 --------
 net/core/devlink.c                                  | 13 ++++++-------
 4 files changed, 6 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
index 6668375edff6..4fbeb3fd71a8 100644
--- a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
+++ b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
@@ -3,14 +3,7 @@
 #include "funeth.h"
 #include "funeth_devlink.h"
 
-static int fun_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
-			   struct netlink_ext_ack *extack)
-{
-	return 0;
-}
-
 static const struct devlink_ops fun_dl_ops = {
-	.info_get = fun_dl_info_get,
 };
 
 struct devlink *fun_devlink_alloc(struct device *dev)
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index f15439d26d21..bda1a6fa2ec4 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -1547,14 +1547,7 @@ static int rvu_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 	return 0;
 }
 
-static int rvu_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
-				struct netlink_ext_ack *extack)
-{
-	return 0;
-}
-
 static const struct devlink_ops rvu_devlink_ops = {
-	.info_get = rvu_devlink_info_get,
 	.eswitch_mode_get = rvu_devlink_eswitch_mode_get,
 	.eswitch_mode_set = rvu_devlink_eswitch_mode_set,
 };
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 5cc6416cf1a6..63ef7c41d18d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -77,15 +77,7 @@ static const struct devlink_param otx2_dl_params[] = {
 			     otx2_dl_mcam_count_validate),
 };
 
-static int otx2_devlink_info_get(struct devlink *devlink,
-				 struct devlink_info_req *req,
-				 struct netlink_ext_ack *extack)
-{
-	return 0;
-}
-
 static const struct devlink_ops otx2_devlink_ops = {
-	.info_get = otx2_devlink_info_get,
 };
 
 int otx2_register_dl(struct otx2_nic *pfvf)
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);
-- 
2.37.4

