netdev - [PATCH net-next 05/15] devlink: Allow setting of packet trap group parameters

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Message-Id: <20200324193250.1322038-6-idosch@idosch.org>
Date:   Tue, 24 Mar 2020 21:32:40 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, kuba@...nel.org,
        andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 05/15] devlink: Allow setting of packet trap group parameters

From: Ido Schimmel <idosch@...lanox.com>

The previous patch allowed device drivers to publish their default
binding between packet trap policers and packet trap groups. However,
some users might not be content with this binding and would like to
change it.

In case user space passed a packet trap policer identifier when setting
a packet trap group, invoke the appropriate device driver callback and
pass the new policer identifier.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/devlink.h |  9 +++++++++
 net/core/devlink.c    | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 84c28e0f2d90..dea3c3fd9634 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -847,6 +847,15 @@ struct devlink_ops {
 	 */
 	int (*trap_group_init)(struct devlink *devlink,
 			       const struct devlink_trap_group *group);
+	/**
+	 * @trap_group_set: Trap group parameters set function.
+	 *
+	 * Note: @policer can be NULL when a policer is being unbound from
+	 * @group.
+	 */
+	int (*trap_group_set)(struct devlink *devlink,
+			      const struct devlink_trap_group *group,
+			      const struct devlink_trap_policer *policer);
 	/**
 	 * @trap_policer_init: Trap policer initialization function.
 	 *
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 4ec7c7578709..e3042e131c1f 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6039,6 +6039,45 @@ devlink_trap_group_action_set(struct devlink *devlink,
 	return 0;
 }
 
+static int devlink_trap_group_set(struct devlink *devlink,
+				  struct devlink_trap_group_item *group_item,
+				  struct genl_info *info)
+{
+	struct devlink_trap_policer_item *policer_item;
+	struct netlink_ext_ack *extack = info->extack;
+	const struct devlink_trap_policer *policer;
+	struct nlattr **attrs = info->attrs;
+	int err;
+
+	if (!devlink->ops->trap_group_set) {
+		if (attrs[DEVLINK_ATTR_TRAP_POLICER_ID])
+			return -EOPNOTSUPP;
+		return 0;
+	}
+
+	policer_item = group_item->policer_item;
+	if (attrs[DEVLINK_ATTR_TRAP_POLICER_ID]) {
+		u32 policer_id;
+
+		policer_id = nla_get_u32(attrs[DEVLINK_ATTR_TRAP_POLICER_ID]);
+		policer_item = devlink_trap_policer_item_lookup(devlink,
+								policer_id);
+		if (policer_id && !policer_item) {
+			NL_SET_ERR_MSG_MOD(extack, "Device did not register this trap policer");
+			return -ENOENT;
+		}
+	}
+	policer = policer_item ? policer_item->policer : NULL;
+
+	err = devlink->ops->trap_group_set(devlink, group_item->group, policer);
+	if (err)
+		return err;
+
+	group_item->policer_item = policer_item;
+
+	return 0;
+}
+
 static int devlink_nl_cmd_trap_group_set_doit(struct sk_buff *skb,
 					      struct genl_info *info)
 {
@@ -6060,6 +6099,10 @@ static int devlink_nl_cmd_trap_group_set_doit(struct sk_buff *skb,
 	if (err)
 		return err;
 
+	err = devlink_trap_group_set(devlink, group_item, info);
+	if (err)
+		return err;
+
 	return 0;
 }
 
-- 
2.24.1