Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / hsr / hsr_slave.c

diff --git a/kernel/net/hsr/hsr_slave.c b/kernel/net/hsr/hsr_slave.c
new file mode 100644 (file)
index 0000000..7d37366
--- /dev/null
+++ b/kernel/net/hsr/hsr_slave.c
@@ -0,0 +1,200 @@
+/* Copyright 2011-2014 Autronica Fire and Security AS
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * Author(s):
+ *     2011-2014 Arvid Brodin, arvid.brodin@alten.se
+ */
+
+#include "hsr_slave.h"
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include "hsr_main.h"
+#include "hsr_device.h"
+#include "hsr_forward.h"
+#include "hsr_framereg.h"
+
+
+static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
+{
+       struct sk_buff *skb = *pskb;
+       struct hsr_port *port;
+
+       if (!skb_mac_header_was_set(skb)) {
+               WARN_ONCE(1, "%s: skb invalid", __func__);
+               return RX_HANDLER_PASS;
+       }
+
+       rcu_read_lock(); /* hsr->node_db, hsr->ports */
+       port = hsr_port_get_rcu(skb->dev);
+
+       if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
+               /* Directly kill frames sent by ourselves */
+               kfree_skb(skb);
+               goto finish_consume;
+       }
+
+       if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
+               goto finish_pass;
+
+       skb_push(skb, ETH_HLEN);
+
+       hsr_forward_skb(skb, port);
+
+finish_consume:
+       rcu_read_unlock(); /* hsr->node_db, hsr->ports */
+       return RX_HANDLER_CONSUMED;
+
+finish_pass:
+       rcu_read_unlock(); /* hsr->node_db, hsr->ports */
+       return RX_HANDLER_PASS;
+}
+
+bool hsr_port_exists(const struct net_device *dev)
+{
+       return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
+}
+
+
+static int hsr_check_dev_ok(struct net_device *dev)
+{
+       /* Don't allow HSR on non-ethernet like devices */
+       if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
+           (dev->addr_len != ETH_ALEN)) {
+               netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
+               return -EINVAL;
+       }
+
+       /* Don't allow enslaving hsr devices */
+       if (is_hsr_master(dev)) {
+               netdev_info(dev, "Cannot create trees of HSR devices.\n");
+               return -EINVAL;
+       }
+
+       if (hsr_port_exists(dev)) {
+               netdev_info(dev, "This device is already a HSR slave.\n");
+               return -EINVAL;
+       }
+
+       if (dev->priv_flags & IFF_802_1Q_VLAN) {
+               netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
+               return -EINVAL;
+       }
+
+       if (dev->priv_flags & IFF_DONT_BRIDGE) {
+               netdev_info(dev, "This device does not support bridging.\n");
+               return -EOPNOTSUPP;
+       }
+
+       /* HSR over bonded devices has not been tested, but I'm not sure it
+        * won't work...
+        */
+
+       return 0;
+}
+
+
+/* Setup device to be added to the HSR bridge. */
+static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
+{
+       int res;
+
+       dev_hold(dev);
+       res = dev_set_promiscuity(dev, 1);
+       if (res)
+               goto fail_promiscuity;
+
+       /* FIXME:
+        * What does net device "adjacency" mean? Should we do
+        * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
+        */
+
+       res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
+       if (res)
+               goto fail_rx_handler;
+       dev_disable_lro(dev);
+
+       return 0;
+
+fail_rx_handler:
+       dev_set_promiscuity(dev, -1);
+fail_promiscuity:
+       dev_put(dev);
+
+       return res;
+}
+
+int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
+                enum hsr_port_type type)
+{
+       struct hsr_port *port, *master;
+       int res;
+
+       if (type != HSR_PT_MASTER) {
+               res = hsr_check_dev_ok(dev);
+               if (res)
+                       return res;
+       }
+
+       port = hsr_port_get_hsr(hsr, type);
+       if (port != NULL)
+               return -EBUSY;  /* This port already exists */
+
+       port = kzalloc(sizeof(*port), GFP_KERNEL);
+       if (port == NULL)
+               return -ENOMEM;
+
+       if (type != HSR_PT_MASTER) {
+               res = hsr_portdev_setup(dev, port);
+               if (res)
+                       goto fail_dev_setup;
+       }
+
+       port->hsr = hsr;
+       port->dev = dev;
+       port->type = type;
+
+       list_add_tail_rcu(&port->port_list, &hsr->ports);
+       synchronize_rcu();
+
+       master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+       netdev_update_features(master->dev);
+       dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+
+       return 0;
+
+fail_dev_setup:
+       kfree(port);
+       return res;
+}
+
+void hsr_del_port(struct hsr_port *port)
+{
+       struct hsr_priv *hsr;
+       struct hsr_port *master;
+
+       hsr = port->hsr;
+       master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+       list_del_rcu(&port->port_list);
+
+       if (port != master) {
+               if (master != NULL) {
+                       netdev_update_features(master->dev);
+                       dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+               }
+               netdev_rx_handler_unregister(port->dev);
+               dev_set_promiscuity(port->dev, -1);
+       }
+
+       /* FIXME?
+        * netdev_upper_dev_unlink(port->dev, port->hsr->dev);
+        */
+
+       synchronize_rcu();
+
+       if (port != master)
+               dev_put(port->dev);
+}