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Date:   Wed,  1 Jul 2020 17:32:47 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, michael.chan@...adcom.com,
        jeffrey.t.kirsher@...el.com, saeedm@...lanox.com, leon@...nel.org,
        jiri@...lanox.com, snelson@...sando.io, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        danieller@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next v2 5/9] devlink: Add a new devlink port lanes attribute and pass to netlink

From: Danielle Ratson <danieller@...lanox.com>

Add a new devlink port attribute that indicates the port's number of lanes.

Drivers are expected to set it via devlink_port_attrs_set(), before
registering the port.

The attribute is not passed to user space in case the number of lanes is
invalid (0).

Signed-off-by: Danielle Ratson <danieller@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 1 +
 include/net/devlink.h                      | 3 +++
 include/uapi/linux/devlink.h               | 2 ++
 net/core/devlink.c                         | 4 ++++
 4 files changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index f44cb1a537f3..6cde196f6b70 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2134,6 +2134,7 @@ static int __mlxsw_core_port_init(struct mlxsw_core *mlxsw_core, u8 local_port,
 	int err;
 
 	attrs.split = split;
+	attrs.lanes = lanes;
 	attrs.flavour = flavour;
 	attrs.phys.port_number = port_number;
 	attrs.phys.split_subport_number = split_port_subnumber;
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 8f9db991192d..91752b79bb29 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -68,10 +68,13 @@ struct devlink_port_pci_vf_attrs {
  * struct devlink_port_attrs - devlink port object
  * @flavour: flavour of the port
  * @split: indicates if this is split port
+ * @lanes: maximum number of lanes the port supports.
+ *	   0 value is not passed to netlink and valid number is a power of 2.
  * @switch_id: if the port is part of switch, this is buffer with ID, otherwise this is NULL
  */
 struct devlink_port_attrs {
 	u8 split:1;
+	u32 lanes;
 	enum devlink_port_flavour flavour;
 	struct netdev_phys_item_id switch_id;
 	union {
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 87c83a82991b..f741ab8d9cf0 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -455,6 +455,8 @@ enum devlink_attr {
 
 	DEVLINK_ATTR_INFO_BOARD_SERIAL_NUMBER,	/* string */
 
+	DEVLINK_ATTR_PORT_LANES,			/* u32 */
+
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 266936c38357..7f26d1054974 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -530,6 +530,10 @@ static int devlink_nl_port_attrs_put(struct sk_buff *msg,
 
 	if (!devlink_port->attrs_set)
 		return 0;
+	if (attrs->lanes) {
+		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_LANES, attrs->lanes))
+			return -EMSGSIZE;
+	}
 	if (nla_put_u16(msg, DEVLINK_ATTR_PORT_FLAVOUR, attrs->flavour))
 		return -EMSGSIZE;
 	switch (devlink_port->attrs.flavour) {
-- 
2.26.2

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