/* * 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 "datapath.h" #include "vport.h" #include "vport-internal_dev.h" static void ovs_vport_record_error(struct vport *, enum vport_err_type err_type); /* List of statically compiled vport implementations. Don't forget to also * add yours to the list at the bottom of vport.h. */ static const struct vport_ops *vport_ops_list[] = { &ovs_netdev_vport_ops, &ovs_internal_vport_ops, #ifdef CONFIG_OPENVSWITCH_GRE &ovs_gre_vport_ops, #endif #ifdef CONFIG_OPENVSWITCH_VXLAN &ovs_vxlan_vport_ops, #endif #ifdef CONFIG_OPENVSWITCH_GENEVE &ovs_geneve_vport_ops, #endif }; /* 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(struct net *net, const char *name) { unsigned int hash = jhash(name, strlen(name), (unsigned long) net); return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; } /** * 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(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; } /** * 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); } /** * 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 *vport; int err = 0; int i; for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) { if (vport_ops_list[i]->type == parms->type) { struct hlist_head *bucket; vport = vport_ops_list[i]->create(parms); if (IS_ERR(vport)) { err = PTR_ERR(vport); goto out; } bucket = hash_bucket(ovs_dp_get_net(vport->dp), vport->ops->get_name(vport)); hlist_add_head_rcu(&vport->hash_node, bucket); return vport; } } err = -EAFNOSUPPORT; out: return ERR_PTR(err); } /** * 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); 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, 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, 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; 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); } /** * 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); kfree_skb(skb); } 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); }