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Linux/net/openvswitch/vport-internal_dev.c

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  1 /*
  2  * Copyright (c) 2007-2012 Nicira, Inc.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of version 2 of the GNU General Public
  6  * License as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful, but
  9  * WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 11  * General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public License
 14  * along with this program; if not, write to the Free Software
 15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 16  * 02110-1301, USA
 17  */
 18 
 19 #include <linux/hardirq.h>
 20 #include <linux/if_vlan.h>
 21 #include <linux/kernel.h>
 22 #include <linux/netdevice.h>
 23 #include <linux/etherdevice.h>
 24 #include <linux/ethtool.h>
 25 #include <linux/skbuff.h>
 26 
 27 #include <net/dst.h>
 28 #include <net/xfrm.h>
 29 #include <net/rtnetlink.h>
 30 
 31 #include "datapath.h"
 32 #include "vport-internal_dev.h"
 33 #include "vport-netdev.h"
 34 
 35 struct internal_dev {
 36         struct vport *vport;
 37 };
 38 
 39 static struct vport_ops ovs_internal_vport_ops;
 40 
 41 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
 42 {
 43         return netdev_priv(netdev);
 44 }
 45 
 46 /* Called with rcu_read_lock_bh. */
 47 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
 48 {
 49         int len, err;
 50 
 51         len = skb->len;
 52         rcu_read_lock();
 53         err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
 54         rcu_read_unlock();
 55 
 56         if (likely(!err)) {
 57                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
 58 
 59                 u64_stats_update_begin(&tstats->syncp);
 60                 tstats->tx_bytes += len;
 61                 tstats->tx_packets++;
 62                 u64_stats_update_end(&tstats->syncp);
 63         } else {
 64                 netdev->stats.tx_errors++;
 65         }
 66         return 0;
 67 }
 68 
 69 static int internal_dev_open(struct net_device *netdev)
 70 {
 71         netif_start_queue(netdev);
 72         return 0;
 73 }
 74 
 75 static int internal_dev_stop(struct net_device *netdev)
 76 {
 77         netif_stop_queue(netdev);
 78         return 0;
 79 }
 80 
 81 static void internal_dev_getinfo(struct net_device *netdev,
 82                                  struct ethtool_drvinfo *info)
 83 {
 84         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
 85 }
 86 
 87 static const struct ethtool_ops internal_dev_ethtool_ops = {
 88         .get_drvinfo    = internal_dev_getinfo,
 89         .get_link       = ethtool_op_get_link,
 90 };
 91 
 92 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
 93 {
 94         if (new_mtu < 68)
 95                 return -EINVAL;
 96 
 97         netdev->mtu = new_mtu;
 98         return 0;
 99 }
100 
101 static void internal_dev_destructor(struct net_device *dev)
102 {
103         struct vport *vport = ovs_internal_dev_get_vport(dev);
104 
105         ovs_vport_free(vport);
106         free_netdev(dev);
107 }
108 
109 static struct rtnl_link_stats64 *
110 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
111 {
112         int i;
113 
114         memset(stats, 0, sizeof(*stats));
115         stats->rx_errors  = dev->stats.rx_errors;
116         stats->tx_errors  = dev->stats.tx_errors;
117         stats->tx_dropped = dev->stats.tx_dropped;
118         stats->rx_dropped = dev->stats.rx_dropped;
119 
120         for_each_possible_cpu(i) {
121                 const struct pcpu_sw_netstats *percpu_stats;
122                 struct pcpu_sw_netstats local_stats;
123                 unsigned int start;
124 
125                 percpu_stats = per_cpu_ptr(dev->tstats, i);
126 
127                 do {
128                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
129                         local_stats = *percpu_stats;
130                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
131 
132                 stats->rx_bytes         += local_stats.rx_bytes;
133                 stats->rx_packets       += local_stats.rx_packets;
134                 stats->tx_bytes         += local_stats.tx_bytes;
135                 stats->tx_packets       += local_stats.tx_packets;
136         }
137 
138         return stats;
139 }
140 
141 static void internal_set_rx_headroom(struct net_device *dev, int new_hr)
142 {
143         dev->needed_headroom = new_hr;
144 }
145 
146 static const struct net_device_ops internal_dev_netdev_ops = {
147         .ndo_open = internal_dev_open,
148         .ndo_stop = internal_dev_stop,
149         .ndo_start_xmit = internal_dev_xmit,
150         .ndo_set_mac_address = eth_mac_addr,
151         .ndo_change_mtu = internal_dev_change_mtu,
152         .ndo_get_stats64 = internal_get_stats,
153         .ndo_set_rx_headroom = internal_set_rx_headroom,
154 };
155 
156 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
157         .kind = "openvswitch",
158 };
159 
160 static void do_setup(struct net_device *netdev)
161 {
162         ether_setup(netdev);
163 
164         netdev->netdev_ops = &internal_dev_netdev_ops;
165 
166         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
167         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
168                               IFF_PHONY_HEADROOM | IFF_NO_QUEUE;
169         netdev->destructor = internal_dev_destructor;
170         netdev->ethtool_ops = &internal_dev_ethtool_ops;
171         netdev->rtnl_link_ops = &internal_dev_link_ops;
172 
173         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
174                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
175                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
176 
177         netdev->vlan_features = netdev->features;
178         netdev->hw_enc_features = netdev->features;
179         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
180         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
181 
182         eth_hw_addr_random(netdev);
183 }
184 
185 static struct vport *internal_dev_create(const struct vport_parms *parms)
186 {
187         struct vport *vport;
188         struct internal_dev *internal_dev;
189         int err;
190 
191         vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
192         if (IS_ERR(vport)) {
193                 err = PTR_ERR(vport);
194                 goto error;
195         }
196 
197         vport->dev = alloc_netdev(sizeof(struct internal_dev),
198                                   parms->name, NET_NAME_UNKNOWN, do_setup);
199         if (!vport->dev) {
200                 err = -ENOMEM;
201                 goto error_free_vport;
202         }
203         vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
204         if (!vport->dev->tstats) {
205                 err = -ENOMEM;
206                 goto error_free_netdev;
207         }
208         vport->dev->needed_headroom = vport->dp->max_headroom;
209 
210         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
211         internal_dev = internal_dev_priv(vport->dev);
212         internal_dev->vport = vport;
213 
214         /* Restrict bridge port to current netns. */
215         if (vport->port_no == OVSP_LOCAL)
216                 vport->dev->features |= NETIF_F_NETNS_LOCAL;
217 
218         rtnl_lock();
219         err = register_netdevice(vport->dev);
220         if (err)
221                 goto error_unlock;
222 
223         dev_set_promiscuity(vport->dev, 1);
224         rtnl_unlock();
225         netif_start_queue(vport->dev);
226 
227         return vport;
228 
229 error_unlock:
230         rtnl_unlock();
231         free_percpu(vport->dev->tstats);
232 error_free_netdev:
233         free_netdev(vport->dev);
234 error_free_vport:
235         ovs_vport_free(vport);
236 error:
237         return ERR_PTR(err);
238 }
239 
240 static void internal_dev_destroy(struct vport *vport)
241 {
242         netif_stop_queue(vport->dev);
243         rtnl_lock();
244         dev_set_promiscuity(vport->dev, -1);
245 
246         /* unregister_netdevice() waits for an RCU grace period. */
247         unregister_netdevice(vport->dev);
248         free_percpu(vport->dev->tstats);
249         rtnl_unlock();
250 }
251 
252 static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
253 {
254         struct net_device *netdev = skb->dev;
255         struct pcpu_sw_netstats *stats;
256 
257         if (unlikely(!(netdev->flags & IFF_UP))) {
258                 kfree_skb(skb);
259                 netdev->stats.rx_dropped++;
260                 return NETDEV_TX_OK;
261         }
262 
263         skb_dst_drop(skb);
264         nf_reset(skb);
265         secpath_reset(skb);
266 
267         skb->pkt_type = PACKET_HOST;
268         skb->protocol = eth_type_trans(skb, netdev);
269         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
270 
271         stats = this_cpu_ptr(netdev->tstats);
272         u64_stats_update_begin(&stats->syncp);
273         stats->rx_packets++;
274         stats->rx_bytes += skb->len;
275         u64_stats_update_end(&stats->syncp);
276 
277         netif_rx(skb);
278         return NETDEV_TX_OK;
279 }
280 
281 static struct vport_ops ovs_internal_vport_ops = {
282         .type           = OVS_VPORT_TYPE_INTERNAL,
283         .create         = internal_dev_create,
284         .destroy        = internal_dev_destroy,
285         .send           = internal_dev_recv,
286 };
287 
288 int ovs_is_internal_dev(const struct net_device *netdev)
289 {
290         return netdev->netdev_ops == &internal_dev_netdev_ops;
291 }
292 
293 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
294 {
295         if (!ovs_is_internal_dev(netdev))
296                 return NULL;
297 
298         return internal_dev_priv(netdev)->vport;
299 }
300 
301 int ovs_internal_dev_rtnl_link_register(void)
302 {
303         int err;
304 
305         err = rtnl_link_register(&internal_dev_link_ops);
306         if (err < 0)
307                 return err;
308 
309         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
310         if (err < 0)
311                 rtnl_link_unregister(&internal_dev_link_ops);
312 
313         return err;
314 }
315 
316 void ovs_internal_dev_rtnl_link_unregister(void)
317 {
318         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
319         rtnl_link_unregister(&internal_dev_link_ops);
320 }
321 

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