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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/if_vlan.h>
 20 #include <linux/kernel.h>
 21 #include <linux/netdevice.h>
 22 #include <linux/etherdevice.h>
 23 #include <linux/ethtool.h>
 24 #include <linux/skbuff.h>
 25 
 26 #include <net/dst.h>
 27 #include <net/xfrm.h>
 28 #include <net/rtnetlink.h>
 29 
 30 #include "datapath.h"
 31 #include "vport-internal_dev.h"
 32 #include "vport-netdev.h"
 33 
 34 struct internal_dev {
 35         struct vport *vport;
 36 };
 37 
 38 static struct vport_ops ovs_internal_vport_ops;
 39 
 40 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
 41 {
 42         return netdev_priv(netdev);
 43 }
 44 
 45 /* Called with rcu_read_lock_bh. */
 46 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
 47 {
 48         int len, err;
 49 
 50         len = skb->len;
 51         rcu_read_lock();
 52         err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
 53         rcu_read_unlock();
 54 
 55         if (likely(!err)) {
 56                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
 57 
 58                 u64_stats_update_begin(&tstats->syncp);
 59                 tstats->tx_bytes += len;
 60                 tstats->tx_packets++;
 61                 u64_stats_update_end(&tstats->syncp);
 62         } else {
 63                 netdev->stats.tx_errors++;
 64         }
 65         return 0;
 66 }
 67 
 68 static int internal_dev_open(struct net_device *netdev)
 69 {
 70         netif_start_queue(netdev);
 71         return 0;
 72 }
 73 
 74 static int internal_dev_stop(struct net_device *netdev)
 75 {
 76         netif_stop_queue(netdev);
 77         return 0;
 78 }
 79 
 80 static void internal_dev_getinfo(struct net_device *netdev,
 81                                  struct ethtool_drvinfo *info)
 82 {
 83         strlcpy(info->driver, "openvswitch", sizeof(info->driver));
 84 }
 85 
 86 static const struct ethtool_ops internal_dev_ethtool_ops = {
 87         .get_drvinfo    = internal_dev_getinfo,
 88         .get_link       = ethtool_op_get_link,
 89 };
 90 
 91 static void internal_dev_destructor(struct net_device *dev)
 92 {
 93         struct vport *vport = ovs_internal_dev_get_vport(dev);
 94 
 95         ovs_vport_free(vport);
 96 }
 97 
 98 static void
 99 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
100 {
101         int i;
102 
103         memset(stats, 0, sizeof(*stats));
104         stats->rx_errors  = dev->stats.rx_errors;
105         stats->tx_errors  = dev->stats.tx_errors;
106         stats->tx_dropped = dev->stats.tx_dropped;
107         stats->rx_dropped = dev->stats.rx_dropped;
108 
109         for_each_possible_cpu(i) {
110                 const struct pcpu_sw_netstats *percpu_stats;
111                 struct pcpu_sw_netstats local_stats;
112                 unsigned int start;
113 
114                 percpu_stats = per_cpu_ptr(dev->tstats, i);
115 
116                 do {
117                         start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
118                         local_stats = *percpu_stats;
119                 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
120 
121                 stats->rx_bytes         += local_stats.rx_bytes;
122                 stats->rx_packets       += local_stats.rx_packets;
123                 stats->tx_bytes         += local_stats.tx_bytes;
124                 stats->tx_packets       += local_stats.tx_packets;
125         }
126 }
127 
128 static const struct net_device_ops internal_dev_netdev_ops = {
129         .ndo_open = internal_dev_open,
130         .ndo_stop = internal_dev_stop,
131         .ndo_start_xmit = internal_dev_xmit,
132         .ndo_set_mac_address = eth_mac_addr,
133         .ndo_get_stats64 = internal_get_stats,
134 };
135 
136 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
137         .kind = "openvswitch",
138 };
139 
140 static void do_setup(struct net_device *netdev)
141 {
142         ether_setup(netdev);
143 
144         netdev->max_mtu = ETH_MAX_MTU;
145 
146         netdev->netdev_ops = &internal_dev_netdev_ops;
147 
148         netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
149         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
150                               IFF_NO_QUEUE;
151         netdev->needs_free_netdev = true;
152         netdev->priv_destructor = internal_dev_destructor;
153         netdev->ethtool_ops = &internal_dev_ethtool_ops;
154         netdev->rtnl_link_ops = &internal_dev_link_ops;
155 
156         netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
157                            NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
158                            NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
159 
160         netdev->vlan_features = netdev->features;
161         netdev->hw_enc_features = netdev->features;
162         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
163         netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
164 
165         eth_hw_addr_random(netdev);
166 }
167 
168 static struct vport *internal_dev_create(const struct vport_parms *parms)
169 {
170         struct vport *vport;
171         struct internal_dev *internal_dev;
172         int err;
173 
174         vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
175         if (IS_ERR(vport)) {
176                 err = PTR_ERR(vport);
177                 goto error;
178         }
179 
180         vport->dev = alloc_netdev(sizeof(struct internal_dev),
181                                   parms->name, NET_NAME_USER, do_setup);
182         if (!vport->dev) {
183                 err = -ENOMEM;
184                 goto error_free_vport;
185         }
186         vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
187         if (!vport->dev->tstats) {
188                 err = -ENOMEM;
189                 goto error_free_netdev;
190         }
191 
192         dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
193         internal_dev = internal_dev_priv(vport->dev);
194         internal_dev->vport = vport;
195 
196         /* Restrict bridge port to current netns. */
197         if (vport->port_no == OVSP_LOCAL)
198                 vport->dev->features |= NETIF_F_NETNS_LOCAL;
199 
200         rtnl_lock();
201         err = register_netdevice(vport->dev);
202         if (err)
203                 goto error_unlock;
204 
205         dev_set_promiscuity(vport->dev, 1);
206         rtnl_unlock();
207         netif_start_queue(vport->dev);
208 
209         return vport;
210 
211 error_unlock:
212         rtnl_unlock();
213         free_percpu(vport->dev->tstats);
214 error_free_netdev:
215         free_netdev(vport->dev);
216 error_free_vport:
217         ovs_vport_free(vport);
218 error:
219         return ERR_PTR(err);
220 }
221 
222 static void internal_dev_destroy(struct vport *vport)
223 {
224         netif_stop_queue(vport->dev);
225         rtnl_lock();
226         dev_set_promiscuity(vport->dev, -1);
227 
228         /* unregister_netdevice() waits for an RCU grace period. */
229         unregister_netdevice(vport->dev);
230         free_percpu(vport->dev->tstats);
231         rtnl_unlock();
232 }
233 
234 static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
235 {
236         struct net_device *netdev = skb->dev;
237         struct pcpu_sw_netstats *stats;
238 
239         if (unlikely(!(netdev->flags & IFF_UP))) {
240                 kfree_skb(skb);
241                 netdev->stats.rx_dropped++;
242                 return NETDEV_TX_OK;
243         }
244 
245         skb_dst_drop(skb);
246         nf_reset(skb);
247         secpath_reset(skb);
248 
249         skb->pkt_type = PACKET_HOST;
250         skb->protocol = eth_type_trans(skb, netdev);
251         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
252 
253         stats = this_cpu_ptr(netdev->tstats);
254         u64_stats_update_begin(&stats->syncp);
255         stats->rx_packets++;
256         stats->rx_bytes += skb->len;
257         u64_stats_update_end(&stats->syncp);
258 
259         netif_rx(skb);
260         return NETDEV_TX_OK;
261 }
262 
263 static struct vport_ops ovs_internal_vport_ops = {
264         .type           = OVS_VPORT_TYPE_INTERNAL,
265         .create         = internal_dev_create,
266         .destroy        = internal_dev_destroy,
267         .send           = internal_dev_recv,
268 };
269 
270 int ovs_is_internal_dev(const struct net_device *netdev)
271 {
272         return netdev->netdev_ops == &internal_dev_netdev_ops;
273 }
274 
275 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
276 {
277         if (!ovs_is_internal_dev(netdev))
278                 return NULL;
279 
280         return internal_dev_priv(netdev)->vport;
281 }
282 
283 int ovs_internal_dev_rtnl_link_register(void)
284 {
285         int err;
286 
287         err = rtnl_link_register(&internal_dev_link_ops);
288         if (err < 0)
289                 return err;
290 
291         err = ovs_vport_ops_register(&ovs_internal_vport_ops);
292         if (err < 0)
293                 rtnl_link_unregister(&internal_dev_link_ops);
294 
295         return err;
296 }
297 
298 void ovs_internal_dev_rtnl_link_unregister(void)
299 {
300         ovs_vport_ops_unregister(&ovs_internal_vport_ops);
301         rtnl_link_unregister(&internal_dev_link_ops);
302 }
303 

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