[RFC net-next v4 4/9] bridge: mrp: Implement netlink interface to configure MRP

[Horatiu Vultur <horatiu.vultur@microchip.com>]

Implement netlink interface to configure MRP. The implementation
will do sanity checks over the attributes and then eventually call the MRP
interface.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 net/bridge/br_mrp_netlink.c | 176 ++++++++++++++++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 net/bridge/br_mrp_netlink.c

diff --git a/net/bridge/br_mrp_netlink.c b/net/bridge/br_mrp_netlink.c
new file mode 100644
index 000000000000..043b7f6cddbe
--- /dev/null
+++ b/net/bridge/br_mrp_netlink.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <net/genetlink.h>
+
+#include <uapi/linux/mrp_bridge.h>
+#include "br_private.h"
+#include "br_private_mrp.h"
+
+static int br_mrp_parse_instance(struct net_bridge *br, struct nlattr *attr,
+				 int cmd)
+{
+	struct br_mrp_instance *instance;
+
+	if (nla_len(attr) != sizeof(*instance))
+		return -EINVAL;
+
+	instance = nla_data(attr);
+
+	if (cmd == RTM_SETLINK)
+		return br_mrp_add(br, instance);
+	else
+		return br_mrp_del(br, instance);
+}
+
+static int br_mrp_parse_port_state(struct net_bridge *br,
+				   struct net_bridge_port *p,
+				   struct nlattr *attr)
+{
+	enum br_mrp_port_state_type state;
+
+	if (nla_len(attr) != sizeof(u32) || !p)
+		return -EINVAL;
+
+	state = nla_get_u32(attr);
+
+	return br_mrp_set_port_state(p, state);
+}
+
+static int br_mrp_parse_port_role(struct net_bridge *br,
+				  struct net_bridge_port *p,
+				  struct nlattr *attr)
+{
+	struct br_mrp_port_role *role;
+
+	if (nla_len(attr) != sizeof(*role) || !p)
+		return -EINVAL;
+
+	role = nla_data(attr);
+
+	return br_mrp_set_port_role(p, role->ring_id, role->role);
+}
+
+static int br_mrp_parse_ring_state(struct net_bridge *br, struct nlattr *attr)
+{
+	struct br_mrp_ring_state *state;
+
+	if (nla_len(attr) != sizeof(*state))
+		return -EINVAL;
+
+	state = nla_data(attr);
+
+	return br_mrp_set_ring_state(br, state->ring_id, state->ring_state);
+}
+
+static int br_mrp_parse_ring_role(struct net_bridge *br, struct nlattr *attr)
+{
+	struct br_mrp_ring_role *role;
+
+	if (nla_len(attr) != sizeof(*role))
+		return -EINVAL;
+
+	role = nla_data(attr);
+
+	return br_mrp_set_ring_role(br, role->ring_id, role->ring_role);
+}
+
+static int br_mrp_parse_start_test(struct net_bridge *br, struct nlattr *attr)
+{
+	struct br_mrp_start_test *test;
+
+	if (nla_len(attr) != sizeof(*test))
+		return -EINVAL;
+
+	test = nla_data(attr);
+
+	return br_mrp_start_test(br, test->ring_id, test->interval,
+				 test->max_miss, test->period);
+}
+
+int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
+		 struct nlattr *attr, int cmd)
+{
+	struct nlattr *mrp;
+	int rem, err;
+
+	nla_for_each_nested(mrp, attr, rem) {
+		err = 0;
+		switch (nla_type(mrp)) {
+		case IFLA_BRIDGE_MRP_INSTANCE:
+			err = br_mrp_parse_instance(br, mrp, cmd);
+			if (err)
+				return err;
+			break;
+		case IFLA_BRIDGE_MRP_PORT_STATE:
+			err = br_mrp_parse_port_state(br, p, mrp);
+			if (err)
+				return err;
+			break;
+		case IFLA_BRIDGE_MRP_PORT_ROLE:
+			err = br_mrp_parse_port_role(br, p, mrp);
+			if (err)
+				return err;
+			break;
+		case IFLA_BRIDGE_MRP_RING_STATE:
+			err = br_mrp_parse_ring_state(br, mrp);
+			if (err)
+				return err;
+			break;
+		case IFLA_BRIDGE_MRP_RING_ROLE:
+			err = br_mrp_parse_ring_role(br, mrp);
+			if (err)
+				return err;
+			break;
+		case IFLA_BRIDGE_MRP_START_TEST:
+			err = br_mrp_parse_start_test(br, mrp);
+			if (err)
+				return err;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+void br_mrp_port_open(struct net_device *dev, u8 loc)
+{
+	struct nlattr *af, *mrp;
+	struct ifinfomsg *hdr;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+	struct net *net;
+
+	net = dev_net(dev);
+
+	skb = nlmsg_new(1024, GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*hdr), 0);
+	if (!nlh)
+		goto errout;
+
+	hdr = nlmsg_data(nlh);
+	hdr->ifi_family = AF_BRIDGE;
+	hdr->__ifi_pad = 0;
+	hdr->ifi_type = dev->type;
+	hdr->ifi_index = dev->ifindex;
+	hdr->ifi_flags = dev_get_flags(dev);
+	hdr->ifi_change = 0;
+
+	af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
+	mrp = nla_nest_start_noflag(skb, IFLA_BRIDGE_MRP);
+
+	nla_put_u32(skb, IFLA_BRIDGE_MRP_RING_OPEN, loc);
+
+	nla_nest_end(skb, mrp);
+	nla_nest_end(skb, af);
+	nlmsg_end(skb, nlh);
+
+	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+	return;
+errout:
+	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
+}
+EXPORT_SYMBOL(br_mrp_port_open);
-- 
2.17.1