[Intel-wired-lan] [PATCH net-next v6 0/3] net: devlink: return the driver name in devlink_nl_info_fill

[Intel-wired-lan] [PATCH net-next v6 0/3] net: devlink: return the driver name in devlink_nl_info_fill

[Vincent Mailhol]

The driver name is available in device_driver::name. Right now,
drivers still have to report this piece of information themselves in
their devlink_ops::info_get callback function.

The goal of this series is to have the devlink core to report this
information instead of the drivers.

The first patch fulfills the actual goal of this series: modify
devlink core to report the driver name and clean-up all drivers. Both
have to be done in an atomic change to avoid attribute
duplication. This same patch also removes the
devlink_info_driver_name_put() function to prevent future drivers from
reporting the driver name themselves.

The second patch allows the core to call devlink_nl_info_fill() even
if the devlink_ops::info_get() callback is NULL. This leads to the
third and final patch which cleans up the drivers which have an empty
info_get().
---
* Changelog *

v5 -> v6:

  * No change in code.

  * add Reviewed-by: Jacob Keller tag.

  * add Reviewed-by: Jiri Pirko tag.

  * squash patches 1 and 2 together.

  * [PATCH 1/3]: remove the paragraph explaining why attributes get
    duplicated if nla_put() is called twice.

v4 -> v5:

  * No change in code.

  * [PATCH 1/4] add Tested-by: Ido Schimmel tag.

  * split patch 3/3 in two patches.

v3 -> v4:

  * Ido pointed out that the mlxsw did not need to be fixed:
    https://lore.kernel.org/netdev/Y4ONgD4dAj8yU2%2F+@shredder/
    Remove the first two patches from the series.

v2 -> v3:

  * [PATCH 3/5] remove the call to devlink_info_driver_name_put() in
    mlxsw driver as well (this was missing in v2, making the build
    fail... sorry for the noise).

  * add additional people in CC as pointed by netdev patchwork CI:
    https://patchwork.kernel.org/project/netdevbpf/list/?series=699451

  * use the "Link:" prefix before URL to silence checkpatch's line
    length warning.


RFC v1 -> v2:

  * drop the RFC tag

  * big rework following the discussion on RFC:
    https://lore.kernel.org/netdev/20221122154934.13937-1-mailhol.vincent@wanadoo.fr/
    Went from one patch to a series of five patches:

  * drop the idea to report the USB serial number following Greg's
    comment:
    https://lore.kernel.org/linux-usb/Y3+VfNdt%2FK7UtRcw@kroah.com/

Vincent Mailhol (3):
  net: devlink: let the core report the driver name instead of the
    drivers
  net: devlink: make the devlink_ops::info_get() callback optional
  net: devlink: clean-up empty devlink_ops::info_get()

 .../marvell/octeontx2/otx2_cpt_devlink.c      |  4 ---
 drivers/net/dsa/hirschmann/hellcreek.c        |  5 ---
 drivers/net/dsa/mv88e6xxx/devlink.c           |  5 ---
 drivers/net/dsa/sja1105/sja1105_devlink.c     | 12 ++-----
 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  4 ---
 .../freescale/dpaa2/dpaa2-eth-devlink.c       | 11 +-----
 .../ethernet/fungible/funeth/funeth_devlink.c |  7 ----
 .../hisilicon/hns3/hns3pf/hclge_devlink.c     |  5 ---
 .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |  5 ---
 drivers/net/ethernet/intel/ice/ice_devlink.c  |  6 ----
 .../marvell/octeontx2/af/rvu_devlink.c        |  7 ----
 .../marvell/octeontx2/nic/otx2_devlink.c      | 15 --------
 .../marvell/prestera/prestera_devlink.c       |  5 ---
 .../net/ethernet/mellanox/mlx5/core/devlink.c |  4 ---
 drivers/net/ethernet/mellanox/mlxsw/core.c    |  5 ---
 .../net/ethernet/netronome/nfp/nfp_devlink.c  |  4 ---
 .../ethernet/pensando/ionic/ionic_devlink.c   |  4 ---
 drivers/net/ethernet/qlogic/qed/qed_devlink.c |  4 ---
 drivers/net/netdevsim/dev.c                   |  3 --
 drivers/ptp/ptp_ocp.c                         |  4 ---
 include/net/devlink.h                         |  2 --
 net/core/devlink.c                            | 35 ++++++++++++-------
 22 files changed, 26 insertions(+), 130 deletions(-)

-- 
2.25.1

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[Intel-wired-lan] [PATCH net-next v6 1/3] net: devlink: let the core report the driver name instead of the drivers

[Vincent Mailhol]

The driver name is available in device_driver::name. Right now,
drivers still have to report this piece of information themselves in
their devlink_ops::info_get callback function.

In order to factorize code, make devlink_nl_info_fill() add the driver
name attribute.

Now that the core sets the driver name attribute, drivers are not
supposed to call devlink_info_driver_name_put() anymore. Remove
devlink_info_driver_name_put() and clean-up all the drivers using this
function in their callback.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Tested-by: Ido Schimmel <idosch@nvidia.com> # mlxsw
Reviewed-by: Jacob Keller  <jacob.e.keller@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
 .../marvell/octeontx2/otx2_cpt_devlink.c      |  4 ---
 drivers/net/dsa/hirschmann/hellcreek.c        |  5 ----
 drivers/net/dsa/mv88e6xxx/devlink.c           |  5 ----
 drivers/net/dsa/sja1105/sja1105_devlink.c     | 12 +++------
 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  4 ---
 .../freescale/dpaa2/dpaa2-eth-devlink.c       | 11 +-------
 .../ethernet/fungible/funeth/funeth_devlink.c |  2 +-
 .../hisilicon/hns3/hns3pf/hclge_devlink.c     |  5 ----
 .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |  5 ----
 drivers/net/ethernet/intel/ice/ice_devlink.c  |  6 -----
 .../marvell/octeontx2/af/rvu_devlink.c        |  2 +-
 .../marvell/octeontx2/nic/otx2_devlink.c      |  9 +------
 .../marvell/prestera/prestera_devlink.c       |  5 ----
 .../net/ethernet/mellanox/mlx5/core/devlink.c |  4 ---
 drivers/net/ethernet/mellanox/mlxsw/core.c    |  5 ----
 .../net/ethernet/netronome/nfp/nfp_devlink.c  |  4 ---
 .../ethernet/pensando/ionic/ionic_devlink.c   |  4 ---
 drivers/net/ethernet/qlogic/qed/qed_devlink.c |  4 ---
 drivers/net/netdevsim/dev.c                   |  3 ---
 drivers/ptp/ptp_ocp.c                         |  4 ---
 include/net/devlink.h                         |  2 --
 net/core/devlink.c                            | 26 +++++++++++++------
 22 files changed, 25 insertions(+), 106 deletions(-)

diff --git a/drivers/crypto/marvell/octeontx2/otx2_cpt_devlink.c b/drivers/crypto/marvell/octeontx2/otx2_cpt_devlink.c
index 7503f6b18ac5..a2aba0b0d68a 100644
--- a/drivers/crypto/marvell/octeontx2/otx2_cpt_devlink.c
+++ b/drivers/crypto/marvell/octeontx2/otx2_cpt_devlink.c
@@ -76,10 +76,6 @@ static int otx2_cpt_devlink_info_get(struct devlink *dl,
 	struct otx2_cptpf_dev *cptpf = cpt_dl->cptpf;
 	int err;
 
-	err = devlink_info_driver_name_put(req, "rvu_cptpf");
-	if (err)
-		return err;
-
 	err = otx2_cpt_dl_info_firmware_version_put(req, cptpf->eng_grps.grp,
 						    "fw.ae", OTX2_CPT_AE_TYPES);
 	if (err)
diff --git a/drivers/net/dsa/hirschmann/hellcreek.c b/drivers/net/dsa/hirschmann/hellcreek.c
index 951f7935c872..595a548bb0a8 100644
--- a/drivers/net/dsa/hirschmann/hellcreek.c
+++ b/drivers/net/dsa/hirschmann/hellcreek.c
@@ -1176,11 +1176,6 @@ static int hellcreek_devlink_info_get(struct dsa_switch *ds,
 				      struct netlink_ext_ack *extack)
 {
 	struct hellcreek *hellcreek = ds->priv;
-	int ret;
-
-	ret = devlink_info_driver_name_put(req, "hellcreek");
-	if (ret)
-		return ret;
 
 	return devlink_info_version_fixed_put(req,
 					      DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
diff --git a/drivers/net/dsa/mv88e6xxx/devlink.c b/drivers/net/dsa/mv88e6xxx/devlink.c
index 1266eabee086..a08dab75e0c0 100644
--- a/drivers/net/dsa/mv88e6xxx/devlink.c
+++ b/drivers/net/dsa/mv88e6xxx/devlink.c
@@ -821,11 +821,6 @@ int mv88e6xxx_devlink_info_get(struct dsa_switch *ds,
 			       struct netlink_ext_ack *extack)
 {
 	struct mv88e6xxx_chip *chip = ds->priv;
-	int err;
-
-	err = devlink_info_driver_name_put(req, "mv88e6xxx");
-	if (err)
-		return err;
 
 	return devlink_info_version_fixed_put(req,
 					      DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
diff --git a/drivers/net/dsa/sja1105/sja1105_devlink.c b/drivers/net/dsa/sja1105/sja1105_devlink.c
index 10c6fea1227f..da532614f34a 100644
--- a/drivers/net/dsa/sja1105/sja1105_devlink.c
+++ b/drivers/net/dsa/sja1105/sja1105_devlink.c
@@ -120,16 +120,10 @@ int sja1105_devlink_info_get(struct dsa_switch *ds,
 			     struct netlink_ext_ack *extack)
 {
 	struct sja1105_private *priv = ds->priv;
-	int rc;
-
-	rc = devlink_info_driver_name_put(req, "sja1105");
-	if (rc)
-		return rc;
 
-	rc = devlink_info_version_fixed_put(req,
-					    DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
-					    priv->info->name);
-	return rc;
+	return devlink_info_version_fixed_put(req,
+					      DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
+					      priv->info->name);
 }
 
 int sja1105_devlink_setup(struct dsa_switch *ds)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 8a6f788f6294..26913dc816d3 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -892,10 +892,6 @@ static int bnxt_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 	u32 ver = 0;
 	int rc;
 
-	rc = devlink_info_driver_name_put(req, DRV_MODULE_NAME);
-	if (rc)
-		return rc;
-
 	if (BNXT_PF(bp) && (bp->flags & BNXT_FLAG_DSN_VALID)) {
 		sprintf(buf, "%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X",
 			bp->dsn[7], bp->dsn[6], bp->dsn[5], bp->dsn[4],
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-devlink.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-devlink.c
index 5c6dd3029e2f..76f808d38066 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-devlink.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-devlink.c
@@ -37,18 +37,9 @@ static int dpaa2_eth_dl_info_get(struct devlink *devlink,
 	struct dpaa2_eth_devlink_priv *dl_priv = devlink_priv(devlink);
 	struct dpaa2_eth_priv *priv = dl_priv->dpaa2_priv;
 	char buf[10];
-	int err;
-
-	err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (err)
-		return err;
 
 	scnprintf(buf, 10, "%d.%d", priv->dpni_ver_major, priv->dpni_ver_minor);
-	err = devlink_info_version_running_put(req, "dpni", buf);
-	if (err)
-		return err;
-
-	return 0;
+	return devlink_info_version_running_put(req, "dpni", buf);
 }
 
 static struct dpaa2_eth_trap_item *
diff --git a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
index d50c222948b4..6668375edff6 100644
--- a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
+++ b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
@@ -6,7 +6,7 @@
 static int fun_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 			   struct netlink_ext_ack *extack)
 {
-	return devlink_info_driver_name_put(req, KBUILD_MODNAME);
+	return 0;
 }
 
 static const struct devlink_ops fun_dl_ops = {
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
index 4c441e6a5082..3d3b69605423 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
@@ -13,11 +13,6 @@ static int hclge_devlink_info_get(struct devlink *devlink,
 	struct hclge_devlink_priv *priv = devlink_priv(devlink);
 	char version_str[HCLGE_DEVLINK_FW_STRING_LEN];
 	struct hclge_dev *hdev = priv->hdev;
-	int ret;
-
-	ret = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (ret)
-		return ret;
 
 	snprintf(version_str, sizeof(version_str), "%lu.%lu.%lu.%lu",
 		 hnae3_get_field(hdev->fw_version, HNAE3_FW_VERSION_BYTE3_MASK,
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
index fdc19868b818..a6c3c5e8f0ab 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
@@ -13,11 +13,6 @@ static int hclgevf_devlink_info_get(struct devlink *devlink,
 	struct hclgevf_devlink_priv *priv = devlink_priv(devlink);
 	char version_str[HCLGEVF_DEVLINK_FW_STRING_LEN];
 	struct hclgevf_dev *hdev = priv->hdev;
-	int ret;
-
-	ret = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (ret)
-		return ret;
 
 	snprintf(version_str, sizeof(version_str), "%lu.%lu.%lu.%lu",
 		 hnae3_get_field(hdev->fw_version, HNAE3_FW_VERSION_BYTE3_MASK,
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index 1d638216484d..ba74977e75dc 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -311,12 +311,6 @@ static int ice_devlink_info_get(struct devlink *devlink,
 		}
 	}
 
-	err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (err) {
-		NL_SET_ERR_MSG_MOD(extack, "Unable to set driver name");
-		goto out_free_ctx;
-	}
-
 	ice_info_get_dsn(pf, ctx);
 
 	err = devlink_info_serial_number_put(req, ctx->buf);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index 88dee589cb21..f15439d26d21 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -1550,7 +1550,7 @@ static int rvu_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 static int rvu_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 				struct netlink_ext_ack *extack)
 {
-	return devlink_info_driver_name_put(req, DRV_NAME);
+	return 0;
 }
 
 static const struct devlink_ops rvu_devlink_ops = {
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 777a27047c8e..5cc6416cf1a6 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -77,18 +77,11 @@ static const struct devlink_param otx2_dl_params[] = {
 			     otx2_dl_mcam_count_validate),
 };
 
-/* Devlink OPs */
 static int otx2_devlink_info_get(struct devlink *devlink,
 				 struct devlink_info_req *req,
 				 struct netlink_ext_ack *extack)
 {
-	struct otx2_devlink *otx2_dl = devlink_priv(devlink);
-	struct otx2_nic *pfvf = otx2_dl->pfvf;
-
-	if (is_otx2_vf(pfvf->pcifunc))
-		return devlink_info_driver_name_put(req, "rvu_nicvf");
-
-	return devlink_info_driver_name_put(req, "rvu_nicpf");
+	return 0;
 }
 
 static const struct devlink_ops otx2_devlink_ops = {
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_devlink.c b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
index 84ad05c9f12d..2a4c9df4eb79 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c
@@ -355,11 +355,6 @@ static int prestera_dl_info_get(struct devlink *dl,
 {
 	struct prestera_switch *sw = devlink_priv(dl);
 	char buf[16];
-	int err;
-
-	err = devlink_info_driver_name_put(req, PRESTERA_DRV_NAME);
-	if (err)
-		return err;
 
 	snprintf(buf, sizeof(buf), "%d.%d.%d",
 		 sw->dev->fw_rev.maj,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index cc2ae427dcb0..751bc4a9edcf 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -46,10 +46,6 @@ mlx5_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 	u32 running_fw, stored_fw;
 	int err;
 
-	err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (err)
-		return err;
-
 	err = devlink_info_version_fixed_put(req, "fw.psid", dev->board_id);
 	if (err)
 		return err;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index a83f6bc30072..a0a06e2eff82 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1459,11 +1459,6 @@ mlxsw_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 	char buf[32];
 	int err;
 
-	err = devlink_info_driver_name_put(req,
-					   mlxsw_core->bus_info->device_kind);
-	if (err)
-		return err;
-
 	mlxsw_reg_mgir_pack(mgir_pl);
 	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgir), mgir_pl);
 	if (err)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
index 8bfd48d50ef0..4c601ff09cd3 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
@@ -239,10 +239,6 @@ nfp_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 	char *buf = NULL;
 	int err;
 
-	err = devlink_info_driver_name_put(req, "nfp");
-	if (err)
-		return err;
-
 	vendor = nfp_hwinfo_lookup(pf->hwinfo, "assembly.vendor");
 	part = nfp_hwinfo_lookup(pf->hwinfo, "assembly.partno");
 	sn = nfp_hwinfo_lookup(pf->hwinfo, "assembly.serial");
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
index 567f778433e2..e6ff757895ab 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
@@ -26,10 +26,6 @@ static int ionic_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 	char buf[16];
 	int err = 0;
 
-	err = devlink_info_driver_name_put(req, IONIC_DRV_NAME);
-	if (err)
-		return err;
-
 	err = devlink_info_version_running_put(req,
 					       DEVLINK_INFO_VERSION_GENERIC_FW,
 					       idev->dev_info.fw_version);
diff --git a/drivers/net/ethernet/qlogic/qed/qed_devlink.c b/drivers/net/ethernet/qlogic/qed/qed_devlink.c
index 6bb4e165b592..922c47797af6 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_devlink.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_devlink.c
@@ -162,10 +162,6 @@ static int qed_devlink_info_get(struct devlink *devlink,
 
 	dev_info = &cdev->common_dev_info;
 
-	err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (err)
-		return err;
-
 	memcpy(buf, cdev->hwfns[0].hw_info.part_num, sizeof(cdev->hwfns[0].hw_info.part_num));
 	buf[sizeof(cdev->hwfns[0].hw_info.part_num)] = 0;
 
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index e14686594a71..b962fc8e1397 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -994,9 +994,6 @@ static int nsim_dev_info_get(struct devlink *devlink,
 {
 	int err;
 
-	err = devlink_info_driver_name_put(req, DRV_NAME);
-	if (err)
-		return err;
 	err = devlink_info_version_stored_put_ext(req, "fw.mgmt", "10.20.30",
 						  DEVLINK_INFO_VERSION_TYPE_COMPONENT);
 	if (err)
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 154d58cbd9ce..4bbaccd543ad 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -1647,10 +1647,6 @@ ptp_ocp_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 	char buf[32];
 	int err;
 
-	err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
-	if (err)
-		return err;
-
 	fw_image = bp->fw_loader ? "loader" : "fw";
 	sprintf(buf, "%d.%d", bp->fw_tag, bp->fw_version);
 	err = devlink_info_version_running_put(req, fw_image, buf);
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 074a79b8933f..52d5fb67e9b8 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1746,8 +1746,6 @@ int devlink_region_snapshot_create(struct devlink_region *region,
 				   u8 *data, u32 snapshot_id);
 int devlink_info_serial_number_put(struct devlink_info_req *req,
 				   const char *sn);
-int devlink_info_driver_name_put(struct devlink_info_req *req,
-				 const char *name);
 int devlink_info_board_serial_number_put(struct devlink_info_req *req,
 					 const char *bsn);
 
diff --git a/net/core/devlink.c b/net/core/devlink.c
index cea154ddce7a..3babc16eeb6b 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6633,14 +6633,6 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
 	return err;
 }
 
-int devlink_info_driver_name_put(struct devlink_info_req *req, const char *name)
-{
-	if (!req->msg)
-		return 0;
-	return nla_put_string(req->msg, DEVLINK_ATTR_INFO_DRIVER_NAME, name);
-}
-EXPORT_SYMBOL_GPL(devlink_info_driver_name_put);
-
 int devlink_info_serial_number_put(struct devlink_info_req *req, const char *sn)
 {
 	if (!req->msg)
@@ -6749,11 +6741,25 @@ int devlink_info_version_running_put_ext(struct devlink_info_req *req,
 }
 EXPORT_SYMBOL_GPL(devlink_info_version_running_put_ext);
 
+static int devlink_nl_driver_info_get(struct device_driver *drv,
+				      struct devlink_info_req *req)
+{
+	if (!drv)
+		return 0;
+
+	if (drv->name[0])
+		return nla_put_string(req->msg, DEVLINK_ATTR_INFO_DRIVER_NAME,
+				      drv->name);
+
+	return 0;
+}
+
 static int
 devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
 		     enum devlink_command cmd, u32 portid,
 		     u32 seq, int flags, struct netlink_ext_ack *extack)
 {
+	struct device *dev = devlink_to_dev(devlink);
 	struct devlink_info_req req = {};
 	void *hdr;
 	int err;
@@ -6771,6 +6777,10 @@ devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
 	if (err)
 		goto err_cancel_msg;
 
+	err = devlink_nl_driver_info_get(dev->driver, &req);
+	if (err)
+		goto err_cancel_msg;
+
 	genlmsg_end(msg, hdr);
 	return 0;
 
-- 
2.25.1

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[Intel-wired-lan] [PATCH net-next v6 2/3] net: devlink: make the devlink_ops::info_get() callback optional

[Vincent Mailhol]

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>
Reviewed-by: Jacob Keller  <jacob.e.keller@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
 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

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[Intel-wired-lan] [PATCH net-next v6 3/3] net: devlink: clean-up empty devlink_ops::info_get()

[Vincent Mailhol]

devlink_ops::info_get() is now optional and devlink will continue to
report information even if that callback gets removed.

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

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Reviewed-by: Jacob Keller  <jacob.e.keller@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
 drivers/net/ethernet/fungible/funeth/funeth_devlink.c     | 7 -------
 drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c   | 7 -------
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c | 8 --------
 3 files changed, 22 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)
-- 
2.25.1

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Re: [Intel-wired-lan] [PATCH net-next v6 0/3] net: devlink: return the driver name in devlink_nl_info_fill

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 29 Nov 2022 18:51:37 +0900 you wrote:
> The driver name is available in device_driver::name. Right now,
> drivers still have to report this piece of information themselves in
> their devlink_ops::info_get callback function.
> 
> The goal of this series is to have the devlink core to report this
> information instead of the drivers.
> 
> [...]

Here is the summary with links:
  - [net-next,v6,1/3] net: devlink: let the core report the driver name instead of the drivers
    https://git.kernel.org/netdev/net-next/c/226bf9805506
  - [net-next,v6,2/3] net: devlink: make the devlink_ops::info_get() callback optional
    https://git.kernel.org/netdev/net-next/c/c5cd7c86847c
  - [net-next,v6,3/3] net: devlink: clean-up empty devlink_ops::info_get()
    https://git.kernel.org/netdev/net-next/c/cf4590b91db4

You are awesome, thank you!
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