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-rw-r--r--net/openvswitch/vport.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
new file mode 100644
index 000000000..067a3fff1
--- /dev/null
+++ b/net/openvswitch/vport.c
@@ -0,0 +1,627 @@
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/if.h>
+#include <linux/if_vlan.h>
+#include <linux/jhash.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/rcupdate.h>
+#include <linux/rtnetlink.h>
+#include <linux/compat.h>
+#include <net/net_namespace.h>
+#include <linux/module.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-internal_dev.h"
+
+static void ovs_vport_record_error(struct vport *,
+ enum vport_err_type err_type);
+
+static LIST_HEAD(vport_ops_list);
+
+/* Protected by RCU read lock for reading, ovs_mutex for writing. */
+static struct hlist_head *dev_table;
+#define VPORT_HASH_BUCKETS 1024
+
+/**
+ * ovs_vport_init - initialize vport subsystem
+ *
+ * Called at module load time to initialize the vport subsystem.
+ */
+int ovs_vport_init(void)
+{
+ dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
+ GFP_KERNEL);
+ if (!dev_table)
+ return -ENOMEM;
+
+ return 0;
+}
+
+/**
+ * ovs_vport_exit - shutdown vport subsystem
+ *
+ * Called at module exit time to shutdown the vport subsystem.
+ */
+void ovs_vport_exit(void)
+{
+ kfree(dev_table);
+}
+
+static struct hlist_head *hash_bucket(const struct net *net, const char *name)
+{
+ unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
+ return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
+}
+
+int ovs_vport_ops_register(struct vport_ops *ops)
+{
+ int err = -EEXIST;
+ struct vport_ops *o;
+
+ ovs_lock();
+ list_for_each_entry(o, &vport_ops_list, list)
+ if (ops->type == o->type)
+ goto errout;
+
+ list_add_tail(&ops->list, &vport_ops_list);
+ err = 0;
+errout:
+ ovs_unlock();
+ return err;
+}
+EXPORT_SYMBOL_GPL(ovs_vport_ops_register);
+
+void ovs_vport_ops_unregister(struct vport_ops *ops)
+{
+ ovs_lock();
+ list_del(&ops->list);
+ ovs_unlock();
+}
+EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
+
+/**
+ * ovs_vport_locate - find a port that has already been created
+ *
+ * @name: name of port to find
+ *
+ * Must be called with ovs or RCU read lock.
+ */
+struct vport *ovs_vport_locate(const struct net *net, const char *name)
+{
+ struct hlist_head *bucket = hash_bucket(net, name);
+ struct vport *vport;
+
+ hlist_for_each_entry_rcu(vport, bucket, hash_node)
+ if (!strcmp(name, vport->ops->get_name(vport)) &&
+ net_eq(ovs_dp_get_net(vport->dp), net))
+ return vport;
+
+ return NULL;
+}
+
+/**
+ * ovs_vport_alloc - allocate and initialize new vport
+ *
+ * @priv_size: Size of private data area to allocate.
+ * @ops: vport device ops
+ *
+ * Allocate and initialize a new vport defined by @ops. The vport will contain
+ * a private data area of size @priv_size that can be accessed using
+ * vport_priv(). vports that are no longer needed should be released with
+ * vport_free().
+ */
+struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
+ const struct vport_parms *parms)
+{
+ struct vport *vport;
+ size_t alloc_size;
+
+ alloc_size = sizeof(struct vport);
+ if (priv_size) {
+ alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
+ alloc_size += priv_size;
+ }
+
+ vport = kzalloc(alloc_size, GFP_KERNEL);
+ if (!vport)
+ return ERR_PTR(-ENOMEM);
+
+ vport->dp = parms->dp;
+ vport->port_no = parms->port_no;
+ vport->ops = ops;
+ INIT_HLIST_NODE(&vport->dp_hash_node);
+
+ if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
+ kfree(vport);
+ return ERR_PTR(-EINVAL);
+ }
+
+ vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!vport->percpu_stats) {
+ kfree(vport);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return vport;
+}
+EXPORT_SYMBOL_GPL(ovs_vport_alloc);
+
+/**
+ * ovs_vport_free - uninitialize and free vport
+ *
+ * @vport: vport to free
+ *
+ * Frees a vport allocated with vport_alloc() when it is no longer needed.
+ *
+ * The caller must ensure that an RCU grace period has passed since the last
+ * time @vport was in a datapath.
+ */
+void ovs_vport_free(struct vport *vport)
+{
+ /* vport is freed from RCU callback or error path, Therefore
+ * it is safe to use raw dereference.
+ */
+ kfree(rcu_dereference_raw(vport->upcall_portids));
+ free_percpu(vport->percpu_stats);
+ kfree(vport);
+}
+EXPORT_SYMBOL_GPL(ovs_vport_free);
+
+static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
+{
+ struct vport_ops *ops;
+
+ list_for_each_entry(ops, &vport_ops_list, list)
+ if (ops->type == parms->type)
+ return ops;
+
+ return NULL;
+}
+
+/**
+ * ovs_vport_add - add vport device (for kernel callers)
+ *
+ * @parms: Information about new vport.
+ *
+ * Creates a new vport with the specified configuration (which is dependent on
+ * device type). ovs_mutex must be held.
+ */
+struct vport *ovs_vport_add(const struct vport_parms *parms)
+{
+ struct vport_ops *ops;
+ struct vport *vport;
+
+ ops = ovs_vport_lookup(parms);
+ if (ops) {
+ struct hlist_head *bucket;
+
+ if (!try_module_get(ops->owner))
+ return ERR_PTR(-EAFNOSUPPORT);
+
+ vport = ops->create(parms);
+ if (IS_ERR(vport)) {
+ module_put(ops->owner);
+ return vport;
+ }
+
+ bucket = hash_bucket(ovs_dp_get_net(vport->dp),
+ vport->ops->get_name(vport));
+ hlist_add_head_rcu(&vport->hash_node, bucket);
+ return vport;
+ }
+
+ /* Unlock to attempt module load and return -EAGAIN if load
+ * was successful as we need to restart the port addition
+ * workflow.
+ */
+ ovs_unlock();
+ request_module("vport-type-%d", parms->type);
+ ovs_lock();
+
+ if (!ovs_vport_lookup(parms))
+ return ERR_PTR(-EAFNOSUPPORT);
+ else
+ return ERR_PTR(-EAGAIN);
+}
+
+/**
+ * ovs_vport_set_options - modify existing vport device (for kernel callers)
+ *
+ * @vport: vport to modify.
+ * @options: New configuration.
+ *
+ * Modifies an existing device with the specified configuration (which is
+ * dependent on device type). ovs_mutex must be held.
+ */
+int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
+{
+ if (!vport->ops->set_options)
+ return -EOPNOTSUPP;
+ return vport->ops->set_options(vport, options);
+}
+
+/**
+ * ovs_vport_del - delete existing vport device
+ *
+ * @vport: vport to delete.
+ *
+ * Detaches @vport from its datapath and destroys it. It is possible to fail
+ * for reasons such as lack of memory. ovs_mutex must be held.
+ */
+void ovs_vport_del(struct vport *vport)
+{
+ ASSERT_OVSL();
+
+ hlist_del_rcu(&vport->hash_node);
+ module_put(vport->ops->owner);
+ vport->ops->destroy(vport);
+}
+
+/**
+ * ovs_vport_get_stats - retrieve device stats
+ *
+ * @vport: vport from which to retrieve the stats
+ * @stats: location to store stats
+ *
+ * Retrieves transmit, receive, and error stats for the given device.
+ *
+ * Must be called with ovs_mutex or rcu_read_lock.
+ */
+void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
+{
+ int i;
+
+ memset(stats, 0, sizeof(*stats));
+
+ /* We potentially have 2 sources of stats that need to be combined:
+ * those we have collected (split into err_stats and percpu_stats) from
+ * set_stats() and device error stats from netdev->get_stats() (for
+ * errors that happen downstream and therefore aren't reported through
+ * our vport_record_error() function).
+ * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
+ * netdev-stats can be directly read over netlink-ioctl.
+ */
+
+ stats->rx_errors = atomic_long_read(&vport->err_stats.rx_errors);
+ stats->tx_errors = atomic_long_read(&vport->err_stats.tx_errors);
+ stats->tx_dropped = atomic_long_read(&vport->err_stats.tx_dropped);
+ stats->rx_dropped = atomic_long_read(&vport->err_stats.rx_dropped);
+
+ for_each_possible_cpu(i) {
+ const struct pcpu_sw_netstats *percpu_stats;
+ struct pcpu_sw_netstats local_stats;
+ unsigned int start;
+
+ percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
+
+ do {
+ start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
+ local_stats = *percpu_stats;
+ } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
+
+ stats->rx_bytes += local_stats.rx_bytes;
+ stats->rx_packets += local_stats.rx_packets;
+ stats->tx_bytes += local_stats.tx_bytes;
+ stats->tx_packets += local_stats.tx_packets;
+ }
+}
+
+/**
+ * ovs_vport_get_options - retrieve device options
+ *
+ * @vport: vport from which to retrieve the options.
+ * @skb: sk_buff where options should be appended.
+ *
+ * Retrieves the configuration of the given device, appending an
+ * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
+ * vport-specific attributes to @skb.
+ *
+ * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
+ * negative error code if a real error occurred. If an error occurs, @skb is
+ * left unmodified.
+ *
+ * Must be called with ovs_mutex or rcu_read_lock.
+ */
+int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
+{
+ struct nlattr *nla;
+ int err;
+
+ if (!vport->ops->get_options)
+ return 0;
+
+ nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
+ if (!nla)
+ return -EMSGSIZE;
+
+ err = vport->ops->get_options(vport, skb);
+ if (err) {
+ nla_nest_cancel(skb, nla);
+ return err;
+ }
+
+ nla_nest_end(skb, nla);
+ return 0;
+}
+
+/**
+ * ovs_vport_set_upcall_portids - set upcall portids of @vport.
+ *
+ * @vport: vport to modify.
+ * @ids: new configuration, an array of port ids.
+ *
+ * Sets the vport's upcall_portids to @ids.
+ *
+ * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
+ * as an array of U32.
+ *
+ * Must be called with ovs_mutex.
+ */
+int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
+{
+ struct vport_portids *old, *vport_portids;
+
+ if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
+ return -EINVAL;
+
+ old = ovsl_dereference(vport->upcall_portids);
+
+ vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
+ GFP_KERNEL);
+ if (!vport_portids)
+ return -ENOMEM;
+
+ vport_portids->n_ids = nla_len(ids) / sizeof(u32);
+ vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
+ nla_memcpy(vport_portids->ids, ids, nla_len(ids));
+
+ rcu_assign_pointer(vport->upcall_portids, vport_portids);
+
+ if (old)
+ kfree_rcu(old, rcu);
+ return 0;
+}
+
+/**
+ * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
+ *
+ * @vport: vport from which to retrieve the portids.
+ * @skb: sk_buff where portids should be appended.
+ *
+ * Retrieves the configuration of the given vport, appending the
+ * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
+ * portids to @skb.
+ *
+ * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
+ * If an error occurs, @skb is left unmodified. Must be called with
+ * ovs_mutex or rcu_read_lock.
+ */
+int ovs_vport_get_upcall_portids(const struct vport *vport,
+ struct sk_buff *skb)
+{
+ struct vport_portids *ids;
+
+ ids = rcu_dereference_ovsl(vport->upcall_portids);
+
+ if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
+ return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
+ ids->n_ids * sizeof(u32), (void *)ids->ids);
+ else
+ return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
+}
+
+/**
+ * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
+ *
+ * @vport: vport from which the missed packet is received.
+ * @skb: skb that the missed packet was received.
+ *
+ * Uses the skb_get_hash() to select the upcall portid to send the
+ * upcall.
+ *
+ * Returns the portid of the target socket. Must be called with rcu_read_lock.
+ */
+u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
+{
+ struct vport_portids *ids;
+ u32 ids_index;
+ u32 hash;
+
+ ids = rcu_dereference(vport->upcall_portids);
+
+ if (ids->n_ids == 1 && ids->ids[0] == 0)
+ return 0;
+
+ hash = skb_get_hash(skb);
+ ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
+ return ids->ids[ids_index];
+}
+
+/**
+ * ovs_vport_receive - pass up received packet to the datapath for processing
+ *
+ * @vport: vport that received the packet
+ * @skb: skb that was received
+ * @tun_key: tunnel (if any) that carried packet
+ *
+ * Must be called with rcu_read_lock. The packet cannot be shared and
+ * skb->data should point to the Ethernet header.
+ */
+void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
+ const struct ovs_tunnel_info *tun_info)
+{
+ struct pcpu_sw_netstats *stats;
+ struct sw_flow_key key;
+ int error;
+
+ stats = this_cpu_ptr(vport->percpu_stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->rx_packets++;
+ stats->rx_bytes += skb->len +
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+ u64_stats_update_end(&stats->syncp);
+
+ OVS_CB(skb)->input_vport = vport;
+ OVS_CB(skb)->egress_tun_info = NULL;
+ /* Extract flow from 'skb' into 'key'. */
+ error = ovs_flow_key_extract(tun_info, skb, &key);
+ if (unlikely(error)) {
+ kfree_skb(skb);
+ return;
+ }
+ ovs_dp_process_packet(skb, &key);
+}
+EXPORT_SYMBOL_GPL(ovs_vport_receive);
+
+/**
+ * ovs_vport_send - send a packet on a device
+ *
+ * @vport: vport on which to send the packet
+ * @skb: skb to send
+ *
+ * Sends the given packet and returns the length of data sent. Either ovs
+ * lock or rcu_read_lock must be held.
+ */
+int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
+{
+ int sent = vport->ops->send(vport, skb);
+
+ if (likely(sent > 0)) {
+ struct pcpu_sw_netstats *stats;
+
+ stats = this_cpu_ptr(vport->percpu_stats);
+
+ u64_stats_update_begin(&stats->syncp);
+ stats->tx_packets++;
+ stats->tx_bytes += sent;
+ u64_stats_update_end(&stats->syncp);
+ } else if (sent < 0) {
+ ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
+ } else {
+ ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
+ }
+ return sent;
+}
+
+/**
+ * ovs_vport_record_error - indicate device error to generic stats layer
+ *
+ * @vport: vport that encountered the error
+ * @err_type: one of enum vport_err_type types to indicate the error type
+ *
+ * If using the vport generic stats layer indicate that an error of the given
+ * type has occurred.
+ */
+static void ovs_vport_record_error(struct vport *vport,
+ enum vport_err_type err_type)
+{
+ switch (err_type) {
+ case VPORT_E_RX_DROPPED:
+ atomic_long_inc(&vport->err_stats.rx_dropped);
+ break;
+
+ case VPORT_E_RX_ERROR:
+ atomic_long_inc(&vport->err_stats.rx_errors);
+ break;
+
+ case VPORT_E_TX_DROPPED:
+ atomic_long_inc(&vport->err_stats.tx_dropped);
+ break;
+
+ case VPORT_E_TX_ERROR:
+ atomic_long_inc(&vport->err_stats.tx_errors);
+ break;
+ }
+
+}
+
+static void free_vport_rcu(struct rcu_head *rcu)
+{
+ struct vport *vport = container_of(rcu, struct vport, rcu);
+
+ ovs_vport_free(vport);
+}
+
+void ovs_vport_deferred_free(struct vport *vport)
+{
+ if (!vport)
+ return;
+
+ call_rcu(&vport->rcu, free_vport_rcu);
+}
+EXPORT_SYMBOL_GPL(ovs_vport_deferred_free);
+
+int ovs_tunnel_get_egress_info(struct ovs_tunnel_info *egress_tun_info,
+ struct net *net,
+ const struct ovs_tunnel_info *tun_info,
+ u8 ipproto,
+ u32 skb_mark,
+ __be16 tp_src,
+ __be16 tp_dst)
+{
+ const struct ovs_key_ipv4_tunnel *tun_key;
+ struct rtable *rt;
+ struct flowi4 fl;
+
+ if (unlikely(!tun_info))
+ return -EINVAL;
+
+ tun_key = &tun_info->tunnel;
+
+ /* Route lookup to get srouce IP address.
+ * The process may need to be changed if the corresponding process
+ * in vports ops changed.
+ */
+ rt = ovs_tunnel_route_lookup(net, tun_key, skb_mark, &fl, ipproto);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+
+ ip_rt_put(rt);
+
+ /* Generate egress_tun_info based on tun_info,
+ * saddr, tp_src and tp_dst
+ */
+ __ovs_flow_tun_info_init(egress_tun_info,
+ fl.saddr, tun_key->ipv4_dst,
+ tun_key->ipv4_tos,
+ tun_key->ipv4_ttl,
+ tp_src, tp_dst,
+ tun_key->tun_id,
+ tun_key->tun_flags,
+ tun_info->options,
+ tun_info->options_len);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ovs_tunnel_get_egress_info);
+
+int ovs_vport_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
+ struct ovs_tunnel_info *info)
+{
+ /* get_egress_tun_info() is only implemented on tunnel ports. */
+ if (unlikely(!vport->ops->get_egress_tun_info))
+ return -EINVAL;
+
+ return vport->ops->get_egress_tun_info(vport, skb, info);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-17 17:14:29 +0000