cregit-Linux how code gets into the kernel

Release 4.8 net/hsr/hsr_slave.c

Directory: net/hsr
/* 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,

#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; u16 protocol; 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; } protocol = eth_hdr(skb)->h_proto; if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR)) 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; }


arvid brodinarvid brodin13489.33%480.00%
peter heisepeter heise1610.67%120.00%

bool hsr_port_exists(const struct net_device *dev) { return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame; }


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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; }


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/* 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; }


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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; }


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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); }


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Overall Contributors

arvid brodinarvid brodin70997.79%685.71%
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Directory: net/hsr
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