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