/* * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include "dpif.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "classifier.h" #include "csum.h" #include "dpif.h" #include "dpif-provider.h" #include "dummy.h" #include "dynamic-string.h" #include "flow.h" #include "hmap.h" #include "latch.h" #include "list.h" #include "meta-flow.h" #include "netdev.h" #include "netdev-vport.h" #include "netlink.h" #include "odp-execute.h" #include "odp-util.h" #include "ofp-print.h" #include "ofpbuf.h" #include "packets.h" #include "poll-loop.h" #include "random.h" #include "seq.h" #include "shash.h" #include "sset.h" #include "timeval.h" #include "unixctl.h" #include "util.h" #include "vlog.h" VLOG_DEFINE_THIS_MODULE(dpif_netdev); /* By default, choose a priority in the middle. */ #define NETDEV_RULE_PRIORITY 0x8000 /* Configuration parameters. */ enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */ /* Enough headroom to add a vlan tag, plus an extra 2 bytes to allow IP * headers to be aligned on a 4-byte boundary. */ enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN }; /* Queues. */ enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */ enum { MAX_QUEUE_LEN = 128 }; /* Maximum number of packets per queue. */ enum { QUEUE_MASK = MAX_QUEUE_LEN - 1 }; BUILD_ASSERT_DECL(IS_POW2(MAX_QUEUE_LEN)); /* Protects against changes to 'dp_netdevs'. */ static struct ovs_mutex dp_netdev_mutex = OVS_MUTEX_INITIALIZER; /* Contains all 'struct dp_netdev's. */ static struct shash dp_netdevs OVS_GUARDED_BY(dp_netdev_mutex) = SHASH_INITIALIZER(&dp_netdevs); struct dp_netdev_upcall { struct dpif_upcall upcall; /* Queued upcall information. */ struct ofpbuf buf; /* ofpbuf instance for upcall.packet. */ }; /* A queue passing packets from a struct dp_netdev to its clients. * * * Thread-safety * ============= * * Any access at all requires the owning 'dp_netdev''s queue_mutex. */ struct dp_netdev_queue { struct dp_netdev_upcall upcalls[MAX_QUEUE_LEN] OVS_GUARDED; unsigned int head OVS_GUARDED; unsigned int tail OVS_GUARDED; }; /* Datapath based on the network device interface from netdev.h. * * * Thread-safety * ============= * * Some members, marked 'const', are immutable. Accessing other members * requires synchronization, as noted in more detail below. * * Acquisition order is, from outermost to innermost: * * dp_netdev_mutex (global) * port_rwlock * flow_mutex * cls.rwlock * queue_mutex */ struct dp_netdev { const struct dpif_class *const class; const char *const name; struct ovs_refcount ref_cnt; atomic_flag destroyed; /* Flows. * * Readers of 'cls' and 'flow_table' must take a 'cls->rwlock' read lock. * * Writers of 'cls' and 'flow_table' must take the 'flow_mutex' and then * the 'cls->rwlock' write lock. (The outer 'flow_mutex' allows writers to * atomically perform multiple operations on 'cls' and 'flow_table'.) */ struct ovs_mutex flow_mutex; struct classifier cls; /* Classifier. Protected by cls.rwlock. */ struct hmap flow_table OVS_GUARDED; /* Flow table. */ /* Queues. * * Everything in 'queues' is protected by 'queue_mutex'. */ struct ovs_mutex queue_mutex; struct dp_netdev_queue queues[N_QUEUES]; struct seq *queue_seq; /* Incremented whenever a packet is queued. */ /* Statistics. * * ovsthread_counter is internally synchronized. */ struct ovsthread_counter *n_hit; /* Number of flow table matches. */ struct ovsthread_counter *n_missed; /* Number of flow table misses. */ struct ovsthread_counter *n_lost; /* Number of misses not passed up. */ /* Ports. * * Any lookup into 'ports' or any access to the dp_netdev_ports found * through 'ports' requires taking 'port_rwlock'. */ struct ovs_rwlock port_rwlock; struct hmap ports OVS_GUARDED; struct seq *port_seq; /* Incremented whenever a port changes. */ /* Forwarding threads. */ struct latch exit_latch; struct dp_forwarder *forwarders; size_t n_forwarders; }; static struct dp_netdev_port *dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t) OVS_REQ_RDLOCK(dp->port_rwlock); /* A port in a netdev-based datapath. */ struct dp_netdev_port { struct hmap_node node; /* Node in dp_netdev's 'ports'. */ odp_port_t port_no; struct netdev *netdev; struct netdev_saved_flags *sf; struct netdev_rx *rx; char *type; /* Port type as requested by user. */ }; /* A flow in dp_netdev's 'flow_table'. * * * Thread-safety * ============= * * Except near the beginning or ending of its lifespan, rule 'rule' belongs to * its dp_netdev's classifier. The text below calls this classifier 'cls'. * * Motivation * ---------- * * The thread safety rules described here for "struct dp_netdev_flow" are * motivated by two goals: * * - Prevent threads that read members of "struct dp_netdev_flow" from * reading bad data due to changes by some thread concurrently modifying * those members. * * - Prevent two threads making changes to members of a given "struct * dp_netdev_flow" from interfering with each other. * * * Rules * ----- * * A flow 'flow' may be accessed without a risk of being freed by code that * holds a read-lock or write-lock on 'cls->rwlock' or that owns a reference to * 'flow->ref_cnt' (or both). Code that needs to hold onto a flow for a while * should take 'cls->rwlock', find the flow it needs, increment 'flow->ref_cnt' * with dpif_netdev_flow_ref(), and drop 'cls->rwlock'. * * 'flow->ref_cnt' protects 'flow' from being freed. It doesn't protect the * flow from being deleted from 'cls' (that's 'cls->rwlock') and it doesn't * protect members of 'flow' from modification (that's 'flow->mutex'). * * 'flow->mutex' protects the members of 'flow' from modification. It doesn't * protect the flow from being deleted from 'cls' (that's 'cls->rwlock') and it * doesn't prevent the flow from being freed (that's 'flow->ref_cnt'). * * Some members, marked 'const', are immutable. Accessing other members * requires synchronization, as noted in more detail below. */ struct dp_netdev_flow { /* Packet classification. */ const struct cls_rule cr; /* In owning dp_netdev's 'cls'. */ /* Hash table index by unmasked flow. */ const struct hmap_node node; /* In owning dp_netdev's 'flow_table'. */ const struct flow flow; /* The flow that created this entry. */ /* Number of references. * The classifier owns one reference. * Any thread trying to keep a rule from being freed should hold its own * reference. */ struct ovs_refcount ref_cnt; /* Protects members marked OVS_GUARDED. * * Acquire after datapath's flow_mutex. */ struct ovs_mutex mutex OVS_ACQ_AFTER(dp_netdev_mutex); /* Statistics. * * Reading or writing these members requires 'mutex'. */ long long int used OVS_GUARDED; /* Last used time, in monotonic msecs. */ long long int packet_count OVS_GUARDED; /* Number of packets matched. */ long long int byte_count OVS_GUARDED; /* Number of bytes matched. */ uint16_t tcp_flags OVS_GUARDED; /* Bitwise-OR of seen tcp_flags values. */ /* Actions. * * Reading 'actions' requires 'mutex'. * Writing 'actions' requires 'mutex' and (to allow for transactions) the * datapath's flow_mutex. */ struct dp_netdev_actions *actions OVS_GUARDED; }; static struct dp_netdev_flow *dp_netdev_flow_ref( const struct dp_netdev_flow *); static void dp_netdev_flow_unref(struct dp_netdev_flow *); /* A set of datapath actions within a "struct dp_netdev_flow". * * * Thread-safety * ============= * * A struct dp_netdev_actions 'actions' may be accessed without a risk of being * freed by code that holds a read-lock or write-lock on 'flow->mutex' (where * 'flow' is the dp_netdev_flow for which 'flow->actions == actions') or that * owns a reference to 'actions->ref_cnt' (or both). */ struct dp_netdev_actions { struct ovs_refcount ref_cnt; /* These members are immutable: they do not change during the struct's * lifetime. */ struct nlattr *actions; /* Sequence of OVS_ACTION_ATTR_* attributes. */ unsigned int size; /* Size of 'actions', in bytes. */ }; struct dp_netdev_actions *dp_netdev_actions_create(const struct nlattr *, size_t); struct dp_netdev_actions *dp_netdev_actions_ref( const struct dp_netdev_actions *); void dp_netdev_actions_unref(struct dp_netdev_actions *); /* A thread that receives packets from some ports, looks them up in the flow * table, and executes the actions it finds. */ struct dp_forwarder { struct dp_netdev *dp; pthread_t thread; char *name; uint32_t min_hash, max_hash; }; /* Interface to netdev-based datapath. */ struct dpif_netdev { struct dpif dpif; struct dp_netdev *dp; uint64_t last_port_seq; }; static int get_port_by_number(struct dp_netdev *dp, odp_port_t port_no, struct dp_netdev_port **portp) OVS_REQ_RDLOCK(dp->port_rwlock); static int get_port_by_name(struct dp_netdev *dp, const char *devname, struct dp_netdev_port **portp) OVS_REQ_RDLOCK(dp->port_rwlock); static void dp_netdev_free(struct dp_netdev *) OVS_REQUIRES(dp_netdev_mutex); static void dp_netdev_flow_flush(struct dp_netdev *); static int do_add_port(struct dp_netdev *dp, const char *devname, const char *type, odp_port_t port_no) OVS_REQ_WRLOCK(dp->port_rwlock); static int do_del_port(struct dp_netdev *dp, odp_port_t port_no) OVS_REQ_WRLOCK(dp->port_rwlock); static int dpif_netdev_open(const struct dpif_class *, const char *name, bool create, struct dpif **); static int dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *, int queue_no, const struct flow *, const struct nlattr *userdata) OVS_EXCLUDED(dp->queue_mutex); static void dp_netdev_execute_actions(struct dp_netdev *dp, const struct flow *, struct ofpbuf *, struct pkt_metadata *, const struct nlattr *actions, size_t actions_len) OVS_REQ_RDLOCK(dp->port_rwlock); static void dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet, struct pkt_metadata *) OVS_REQ_RDLOCK(dp->port_rwlock); static void dp_netdev_set_threads(struct dp_netdev *, int n); static struct dpif_netdev * dpif_netdev_cast(const struct dpif *dpif) { ovs_assert(dpif->dpif_class->open == dpif_netdev_open); return CONTAINER_OF(dpif, struct dpif_netdev, dpif); } static struct dp_netdev * get_dp_netdev(const struct dpif *dpif) { return dpif_netdev_cast(dpif)->dp; } static int dpif_netdev_enumerate(struct sset *all_dps) { struct shash_node *node; ovs_mutex_lock(&dp_netdev_mutex); SHASH_FOR_EACH(node, &dp_netdevs) { sset_add(all_dps, node->name); } ovs_mutex_unlock(&dp_netdev_mutex); return 0; } static bool dpif_netdev_class_is_dummy(const struct dpif_class *class) { return class != &dpif_netdev_class; } static bool dpif_netdev_class_is_planetlab(const struct dpif_class *class) { return class == &dpif_planetlab_class; } static const char * dpif_netdev_port_open_type(const struct dpif_class *class, const char *type) { return strcmp(type, "internal") ? type : dpif_netdev_class_is_planetlab(class) ? "pltap" : dpif_netdev_class_is_dummy(class) ? "dummy" : "tap"; } static struct dpif * create_dpif_netdev(struct dp_netdev *dp) { uint16_t netflow_id = hash_string(dp->name, 0); struct dpif_netdev *dpif; ovs_refcount_ref(&dp->ref_cnt); dpif = xmalloc(sizeof *dpif); dpif_init(&dpif->dpif, dp->class, dp->name, netflow_id >> 8, netflow_id); dpif->dp = dp; dpif->last_port_seq = seq_read(dp->port_seq); return &dpif->dpif; } /* Choose an unused, non-zero port number and return it on success. * Return ODPP_NONE on failure. */ static odp_port_t choose_port(struct dp_netdev *dp, const char *name) OVS_REQ_RDLOCK(dp->port_rwlock) { uint32_t port_no; if (dp->class != &dpif_netdev_class && dp->class != &dpif_planetlab_class) { const char *p; int start_no = 0; /* If the port name begins with "br", start the number search at * 100 to make writing tests easier. */ if (!strncmp(name, "br", 2)) { start_no = 100; } /* If the port name contains a number, try to assign that port number. * This can make writing unit tests easier because port numbers are * predictable. */ for (p = name; *p != '\0'; p++) { if (isdigit((unsigned char) *p)) { port_no = start_no + strtol(p, NULL, 10); if (port_no > 0 && port_no != odp_to_u32(ODPP_NONE) && !dp_netdev_lookup_port(dp, u32_to_odp(port_no))) { return u32_to_odp(port_no); } break; } } } for (port_no = 1; port_no <= UINT16_MAX; port_no++) { if (!dp_netdev_lookup_port(dp, u32_to_odp(port_no))) { return u32_to_odp(port_no); } } return ODPP_NONE; } static int create_dp_netdev(const char *name, const struct dpif_class *class, struct dp_netdev **dpp) OVS_REQUIRES(dp_netdev_mutex) { struct dp_netdev *dp; int error; int i; dp = xzalloc(sizeof *dp); shash_add(&dp_netdevs, name, dp); *CONST_CAST(const struct dpif_class **, &dp->class) = class; *CONST_CAST(const char **, &dp->name) = xstrdup(name); ovs_refcount_init(&dp->ref_cnt); atomic_flag_init(&dp->destroyed); ovs_mutex_init(&dp->flow_mutex); classifier_init(&dp->cls, NULL); hmap_init(&dp->flow_table); ovs_mutex_init(&dp->queue_mutex); ovs_mutex_lock(&dp->queue_mutex); for (i = 0; i < N_QUEUES; i++) { dp->queues[i].head = dp->queues[i].tail = 0; } ovs_mutex_unlock(&dp->queue_mutex); dp->queue_seq = seq_create(); dp->n_hit = ovsthread_counter_create(); dp->n_missed = ovsthread_counter_create(); dp->n_lost = ovsthread_counter_create(); ovs_rwlock_init(&dp->port_rwlock); hmap_init(&dp->ports); dp->port_seq = seq_create(); latch_init(&dp->exit_latch); ovs_rwlock_wrlock(&dp->port_rwlock); error = do_add_port(dp, name, "internal", ODPP_LOCAL); ovs_rwlock_unlock(&dp->port_rwlock); if (error) { dp_netdev_free(dp); return error; } dp_netdev_set_threads(dp, 2); *dpp = dp; return 0; } static int dpif_netdev_open(const struct dpif_class *class, const char *name, bool create, struct dpif **dpifp) { struct dp_netdev *dp; int error; ovs_mutex_lock(&dp_netdev_mutex); dp = shash_find_data(&dp_netdevs, name); if (!dp) { error = create ? create_dp_netdev(name, class, &dp) : ENODEV; } else { error = (dp->class != class ? EINVAL : create ? EEXIST : 0); } if (!error) { *dpifp = create_dpif_netdev(dp); } ovs_mutex_unlock(&dp_netdev_mutex); return error; } static void dp_netdev_purge_queues(struct dp_netdev *dp) { int i; ovs_mutex_lock(&dp->queue_mutex); for (i = 0; i < N_QUEUES; i++) { struct dp_netdev_queue *q = &dp->queues[i]; while (q->tail != q->head) { struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK]; ofpbuf_uninit(&u->upcall.packet); ofpbuf_uninit(&u->buf); } } ovs_mutex_unlock(&dp->queue_mutex); } /* Requires dp_netdev_mutex so that we can't get a new reference to 'dp' * through the 'dp_netdevs' shash while freeing 'dp'. */ static void dp_netdev_free(struct dp_netdev *dp) OVS_REQUIRES(dp_netdev_mutex) { struct dp_netdev_port *port, *next; shash_find_and_delete(&dp_netdevs, dp->name); dp_netdev_set_threads(dp, 0); free(dp->forwarders); dp_netdev_flow_flush(dp); ovs_rwlock_wrlock(&dp->port_rwlock); HMAP_FOR_EACH_SAFE (port, next, node, &dp->ports) { do_del_port(dp, port->port_no); } ovs_rwlock_unlock(&dp->port_rwlock); ovsthread_counter_destroy(dp->n_hit); ovsthread_counter_destroy(dp->n_missed); ovsthread_counter_destroy(dp->n_lost); dp_netdev_purge_queues(dp); seq_destroy(dp->queue_seq); ovs_mutex_destroy(&dp->queue_mutex); classifier_destroy(&dp->cls); hmap_destroy(&dp->flow_table); ovs_mutex_destroy(&dp->flow_mutex); seq_destroy(dp->port_seq); hmap_destroy(&dp->ports); atomic_flag_destroy(&dp->destroyed); ovs_refcount_destroy(&dp->ref_cnt); latch_destroy(&dp->exit_latch); free(CONST_CAST(char *, dp->name)); free(dp); } static void dp_netdev_unref(struct dp_netdev *dp) { if (dp) { /* Take dp_netdev_mutex so that, if dp->ref_cnt falls to zero, we can't * get a new reference to 'dp' through the 'dp_netdevs' shash. */ ovs_mutex_lock(&dp_netdev_mutex); if (ovs_refcount_unref(&dp->ref_cnt) == 1) { dp_netdev_free(dp); } ovs_mutex_unlock(&dp_netdev_mutex); } } static void dpif_netdev_close(struct dpif *dpif) { struct dp_netdev *dp = get_dp_netdev(dpif); dp_netdev_unref(dp); free(dpif); } static int dpif_netdev_destroy(struct dpif *dpif) { struct dp_netdev *dp = get_dp_netdev(dpif); if (!atomic_flag_test_and_set(&dp->destroyed)) { if (ovs_refcount_unref(&dp->ref_cnt) == 1) { /* Can't happen: 'dpif' still owns a reference to 'dp'. */ OVS_NOT_REACHED(); } } return 0; } static int dpif_netdev_get_stats(const struct dpif *dpif, struct dpif_dp_stats *stats) { struct dp_netdev *dp = get_dp_netdev(dpif); fat_rwlock_rdlock(&dp->cls.rwlock); stats->n_flows = hmap_count(&dp->flow_table); fat_rwlock_unlock(&dp->cls.rwlock); stats->n_hit = ovsthread_counter_read(dp->n_hit); stats->n_missed = ovsthread_counter_read(dp->n_missed); stats->n_lost = ovsthread_counter_read(dp->n_lost); stats->n_masks = UINT32_MAX; stats->n_mask_hit = UINT64_MAX; return 0; } static int do_add_port(struct dp_netdev *dp, const char *devname, const char *type, odp_port_t port_no) OVS_REQ_WRLOCK(dp->port_rwlock) { struct netdev_saved_flags *sf; struct dp_netdev_port *port; struct netdev *netdev; struct netdev_rx *rx; enum netdev_flags flags; const char *open_type; int error; /* XXX reject devices already in some dp_netdev. */ /* Open and validate network device. */ open_type = dpif_netdev_port_open_type(dp->class, type); error = netdev_open(devname, open_type, &netdev); if (error) { return error; } /* XXX reject non-Ethernet devices */ netdev_get_flags(netdev, &flags); if (flags & NETDEV_LOOPBACK) { VLOG_ERR("%s: cannot add a loopback device", devname); netdev_close(netdev); return EINVAL; } error = netdev_rx_open(netdev, &rx); if (error && !(error == EOPNOTSUPP && dpif_netdev_class_is_dummy(dp->class))) { VLOG_ERR("%s: cannot receive packets on this network device (%s)", devname, ovs_strerror(errno)); netdev_close(netdev); return error; } error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, &sf); if (error) { netdev_rx_close(rx); netdev_close(netdev); return error; } port = xmalloc(sizeof *port); port->port_no = port_no; port->netdev = netdev; port->sf = sf; port->rx = rx; port->type = xstrdup(type); hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0)); seq_change(dp->port_seq); return 0; } static int dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev, odp_port_t *port_nop) { struct dp_netdev *dp = get_dp_netdev(dpif); char namebuf[NETDEV_VPORT_NAME_BUFSIZE]; const char *dpif_port; odp_port_t port_no; int error; ovs_rwlock_wrlock(&dp->port_rwlock); dpif_port = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf); if (*port_nop != ODPP_NONE) { port_no = *port_nop; error = dp_netdev_lookup_port(dp, *port_nop) ? EBUSY : 0; } else { port_no = choose_port(dp, dpif_port); error = port_no == ODPP_NONE ? EFBIG : 0; } if (!error) { *port_nop = port_no; error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no); } ovs_rwlock_unlock(&dp->port_rwlock); return error; } static int dpif_netdev_port_del(struct dpif *dpif, odp_port_t port_no) { struct dp_netdev *dp = get_dp_netdev(dpif); int error; ovs_rwlock_wrlock(&dp->port_rwlock); error = port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no); ovs_rwlock_unlock(&dp->port_rwlock); return error; } static bool is_valid_port_number(odp_port_t port_no) { return port_no != ODPP_NONE; } static struct dp_netdev_port * dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t port_no) OVS_REQ_RDLOCK(dp->port_rwlock) { struct dp_netdev_port *port; HMAP_FOR_EACH_IN_BUCKET (port, node, hash_int(odp_to_u32(port_no), 0), &dp->ports) { if (port->port_no == port_no) { return port; } } return NULL; } static int get_port_by_number(struct dp_netdev *dp, odp_port_t port_no, struct dp_netdev_port **portp) OVS_REQ_RDLOCK(dp->port_rwlock) { if (!is_valid_port_number(port_no)) { *portp = NULL; return EINVAL; } else { *portp = dp_netdev_lookup_port(dp, port_no); return *portp ? 0 : ENOENT; } } static int get_port_by_name(struct dp_netdev *dp, const char *devname, struct dp_netdev_port **portp) OVS_REQ_RDLOCK(dp->port_rwlock) { struct dp_netdev_port *port; HMAP_FOR_EACH (port, node, &dp->ports) { if (!strcmp(netdev_get_name(port->netdev), devname)) { *portp = port; return 0; } } return ENOENT; } static int do_del_port(struct dp_netdev *dp, odp_port_t port_no) OVS_REQ_WRLOCK(dp->port_rwlock) { struct dp_netdev_port *port; int error; error = get_port_by_number(dp, port_no, &port); if (error) { return error; } hmap_remove(&dp->ports, &port->node); seq_change(dp->port_seq); netdev_close(port->netdev); netdev_restore_flags(port->sf); netdev_rx_close(port->rx); free(port->type); free(port); return 0; } static void answer_port_query(const struct dp_netdev_port *port, struct dpif_port *dpif_port) { dpif_port->name = xstrdup(netdev_get_name(port->netdev)); dpif_port->type = xstrdup(port->type); dpif_port->port_no = port->port_no; } static int dpif_netdev_port_query_by_number(const struct dpif *dpif, odp_port_t port_no, struct dpif_port *dpif_port) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_port *port; int error; ovs_rwlock_rdlock(&dp->port_rwlock); error = get_port_by_number(dp, port_no, &port); if (!error && dpif_port) { answer_port_query(port, dpif_port); } ovs_rwlock_unlock(&dp->port_rwlock); return error; } static int dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname, struct dpif_port *dpif_port) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_port *port; int error; ovs_rwlock_rdlock(&dp->port_rwlock); error = get_port_by_name(dp, devname, &port); if (!error && dpif_port) { answer_port_query(port, dpif_port); } ovs_rwlock_unlock(&dp->port_rwlock); return error; } static void dp_netdev_remove_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow) OVS_REQ_WRLOCK(dp->cls.rwlock) OVS_REQUIRES(dp->flow_mutex) { struct cls_rule *cr = CONST_CAST(struct cls_rule *, &flow->cr); struct hmap_node *node = CONST_CAST(struct hmap_node *, &flow->node); classifier_remove(&dp->cls, cr); hmap_remove(&dp->flow_table, node); dp_netdev_flow_unref(flow); } static struct dp_netdev_flow * dp_netdev_flow_ref(const struct dp_netdev_flow *flow_) { struct dp_netdev_flow *flow = CONST_CAST(struct dp_netdev_flow *, flow_); if (flow) { ovs_refcount_ref(&flow->ref_cnt); } return flow; } static void dp_netdev_flow_unref(struct dp_netdev_flow *flow) { if (flow && ovs_refcount_unref(&flow->ref_cnt) == 1) { cls_rule_destroy(CONST_CAST(struct cls_rule *, &flow->cr)); ovs_mutex_lock(&flow->mutex); dp_netdev_actions_unref(flow->actions); ovs_mutex_unlock(&flow->mutex); ovs_mutex_destroy(&flow->mutex); free(flow); } } static void dp_netdev_flow_flush(struct dp_netdev *dp) { struct dp_netdev_flow *netdev_flow, *next; ovs_mutex_lock(&dp->flow_mutex); fat_rwlock_wrlock(&dp->cls.rwlock); HMAP_FOR_EACH_SAFE (netdev_flow, next, node, &dp->flow_table) { dp_netdev_remove_flow(dp, netdev_flow); } fat_rwlock_unlock(&dp->cls.rwlock); ovs_mutex_unlock(&dp->flow_mutex); } static int dpif_netdev_flow_flush(struct dpif *dpif) { struct dp_netdev *dp = get_dp_netdev(dpif); dp_netdev_flow_flush(dp); return 0; } struct dp_netdev_port_state { uint32_t bucket; uint32_t offset; char *name; }; static int dpif_netdev_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep) { *statep = xzalloc(sizeof(struct dp_netdev_port_state)); return 0; } static int dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_, struct dpif_port *dpif_port) { struct dp_netdev_port_state *state = state_; struct dp_netdev *dp = get_dp_netdev(dpif); struct hmap_node *node; int retval; ovs_rwlock_rdlock(&dp->port_rwlock); node = hmap_at_position(&dp->ports, &state->bucket, &state->offset); if (node) { struct dp_netdev_port *port; port = CONTAINER_OF(node, struct dp_netdev_port, node); free(state->name); state->name = xstrdup(netdev_get_name(port->netdev)); dpif_port->name = state->name; dpif_port->type = port->type; dpif_port->port_no = port->port_no; retval = 0; } else { retval = EOF; } ovs_rwlock_unlock(&dp->port_rwlock); return retval; } static int dpif_netdev_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_) { struct dp_netdev_port_state *state = state_; free(state->name); free(state); return 0; } static int dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED) { struct dpif_netdev *dpif = dpif_netdev_cast(dpif_); uint64_t new_port_seq; int error; new_port_seq = seq_read(dpif->dp->port_seq); if (dpif->last_port_seq != new_port_seq) { dpif->last_port_seq = new_port_seq; error = ENOBUFS; } else { error = EAGAIN; } return error; } static void dpif_netdev_port_poll_wait(const struct dpif *dpif_) { struct dpif_netdev *dpif = dpif_netdev_cast(dpif_); seq_wait(dpif->dp->port_seq, dpif->last_port_seq); } static struct dp_netdev_flow * dp_netdev_flow_cast(const struct cls_rule *cr) { return cr ? CONTAINER_OF(cr, struct dp_netdev_flow, cr) : NULL; } static struct dp_netdev_flow * dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct flow *flow) OVS_EXCLUDED(dp->cls.rwlock) { struct dp_netdev_flow *netdev_flow; fat_rwlock_rdlock(&dp->cls.rwlock); netdev_flow = dp_netdev_flow_cast(classifier_lookup(&dp->cls, flow, NULL)); dp_netdev_flow_ref(netdev_flow); fat_rwlock_unlock(&dp->cls.rwlock); return netdev_flow; } static struct dp_netdev_flow * dp_netdev_find_flow(const struct dp_netdev *dp, const struct flow *flow) OVS_REQ_RDLOCK(dp->cls.rwlock) { struct dp_netdev_flow *netdev_flow; HMAP_FOR_EACH_WITH_HASH (netdev_flow, node, flow_hash(flow, 0), &dp->flow_table) { if (flow_equal(&netdev_flow->flow, flow)) { return dp_netdev_flow_ref(netdev_flow); } } return NULL; } static void get_dpif_flow_stats(struct dp_netdev_flow *netdev_flow, struct dpif_flow_stats *stats) OVS_REQ_RDLOCK(netdev_flow->mutex) { stats->n_packets = netdev_flow->packet_count; stats->n_bytes = netdev_flow->byte_count; stats->used = netdev_flow->used; stats->tcp_flags = netdev_flow->tcp_flags; } static int dpif_netdev_mask_from_nlattrs(const struct nlattr *key, uint32_t key_len, const struct nlattr *mask_key, uint32_t mask_key_len, const struct flow *flow, struct flow *mask) { if (mask_key_len) { enum odp_key_fitness fitness; fitness = odp_flow_key_to_mask(mask_key, mask_key_len, mask, flow); if (fitness) { /* This should not happen: it indicates that * odp_flow_key_from_mask() and odp_flow_key_to_mask() * disagree on the acceptable form of a mask. Log the problem * as an error, with enough details to enable debugging. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); if (!VLOG_DROP_ERR(&rl)) { struct ds s; ds_init(&s); odp_flow_format(key, key_len, mask_key, mask_key_len, NULL, &s, true); VLOG_ERR("internal error parsing flow mask %s (%s)", ds_cstr(&s), odp_key_fitness_to_string(fitness)); ds_destroy(&s); } return EINVAL; } /* Force unwildcard the in_port. */ mask->in_port.odp_port = u32_to_odp(UINT32_MAX); } else { enum mf_field_id id; /* No mask key, unwildcard everything except fields whose * prerequisities are not met. */ memset(mask, 0x0, sizeof *mask); for (id = 0; id < MFF_N_IDS; ++id) { /* Skip registers and metadata. */ if (!(id >= MFF_REG0 && id < MFF_REG0 + FLOW_N_REGS) && id != MFF_METADATA) { const struct mf_field *mf = mf_from_id(id); if (mf_are_prereqs_ok(mf, flow)) { mf_mask_field(mf, mask); } } } } return 0; } static int dpif_netdev_flow_from_nlattrs(const struct nlattr *key, uint32_t key_len, struct flow *flow) { odp_port_t in_port; if (odp_flow_key_to_flow(key, key_len, flow)) { /* This should not happen: it indicates that odp_flow_key_from_flow() * and odp_flow_key_to_flow() disagree on the acceptable form of a * flow. Log the problem as an error, with enough details to enable * debugging. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); if (!VLOG_DROP_ERR(&rl)) { struct ds s; ds_init(&s); odp_flow_format(key, key_len, NULL, 0, NULL, &s, true); VLOG_ERR("internal error parsing flow key %s", ds_cstr(&s)); ds_destroy(&s); } return EINVAL; } in_port = flow->in_port.odp_port; if (!is_valid_port_number(in_port) && in_port != ODPP_NONE) { return EINVAL; } return 0; } static int dpif_netdev_flow_get(const struct dpif *dpif, const struct nlattr *nl_key, size_t nl_key_len, struct ofpbuf **actionsp, struct dpif_flow_stats *stats) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_flow *netdev_flow; struct flow key; int error; error = dpif_netdev_flow_from_nlattrs(nl_key, nl_key_len, &key); if (error) { return error; } fat_rwlock_rdlock(&dp->cls.rwlock); netdev_flow = dp_netdev_find_flow(dp, &key); fat_rwlock_unlock(&dp->cls.rwlock); if (netdev_flow) { struct dp_netdev_actions *actions = NULL; ovs_mutex_lock(&netdev_flow->mutex); if (stats) { get_dpif_flow_stats(netdev_flow, stats); } if (actionsp) { actions = dp_netdev_actions_ref(netdev_flow->actions); } ovs_mutex_unlock(&netdev_flow->mutex); dp_netdev_flow_unref(netdev_flow); if (actionsp) { *actionsp = ofpbuf_clone_data(actions->actions, actions->size); dp_netdev_actions_unref(actions); } } else { error = ENOENT; } return error; } static int dp_netdev_flow_add(struct dp_netdev *dp, const struct flow *flow, const struct flow_wildcards *wc, const struct nlattr *actions, size_t actions_len) OVS_REQUIRES(dp->flow_mutex) { struct dp_netdev_flow *netdev_flow; struct match match; netdev_flow = xzalloc(sizeof *netdev_flow); *CONST_CAST(struct flow *, &netdev_flow->flow) = *flow; ovs_refcount_init(&netdev_flow->ref_cnt); ovs_mutex_init(&netdev_flow->mutex); ovs_mutex_lock(&netdev_flow->mutex); netdev_flow->actions = dp_netdev_actions_create(actions, actions_len); match_init(&match, flow, wc); cls_rule_init(CONST_CAST(struct cls_rule *, &netdev_flow->cr), &match, NETDEV_RULE_PRIORITY); fat_rwlock_wrlock(&dp->cls.rwlock); classifier_insert(&dp->cls, CONST_CAST(struct cls_rule *, &netdev_flow->cr)); hmap_insert(&dp->flow_table, CONST_CAST(struct hmap_node *, &netdev_flow->node), flow_hash(flow, 0)); fat_rwlock_unlock(&dp->cls.rwlock); ovs_mutex_unlock(&netdev_flow->mutex); return 0; } static void clear_stats(struct dp_netdev_flow *netdev_flow) OVS_REQUIRES(netdev_flow->mutex) { netdev_flow->used = 0; netdev_flow->packet_count = 0; netdev_flow->byte_count = 0; netdev_flow->tcp_flags = 0; } static int dpif_netdev_flow_put(struct dpif *dpif, const struct dpif_flow_put *put) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_flow *netdev_flow; struct flow flow; struct flow_wildcards wc; int error; error = dpif_netdev_flow_from_nlattrs(put->key, put->key_len, &flow); if (error) { return error; } error = dpif_netdev_mask_from_nlattrs(put->key, put->key_len, put->mask, put->mask_len, &flow, &wc.masks); if (error) { return error; } ovs_mutex_lock(&dp->flow_mutex); netdev_flow = dp_netdev_lookup_flow(dp, &flow); if (!netdev_flow) { if (put->flags & DPIF_FP_CREATE) { if (hmap_count(&dp->flow_table) < MAX_FLOWS) { if (put->stats) { memset(put->stats, 0, sizeof *put->stats); } error = dp_netdev_flow_add(dp, &flow, &wc, put->actions, put->actions_len); } else { error = EFBIG; } } else { error = ENOENT; } } else { if (put->flags & DPIF_FP_MODIFY && flow_equal(&flow, &netdev_flow->flow)) { struct dp_netdev_actions *new_actions; struct dp_netdev_actions *old_actions; new_actions = dp_netdev_actions_create(put->actions, put->actions_len); ovs_mutex_lock(&netdev_flow->mutex); old_actions = netdev_flow->actions; netdev_flow->actions = new_actions; if (put->stats) { get_dpif_flow_stats(netdev_flow, put->stats); } if (put->flags & DPIF_FP_ZERO_STATS) { clear_stats(netdev_flow); } ovs_mutex_unlock(&netdev_flow->mutex); dp_netdev_actions_unref(old_actions); } else if (put->flags & DPIF_FP_CREATE) { error = EEXIST; } else { /* Overlapping flow. */ error = EINVAL; } dp_netdev_flow_unref(netdev_flow); } ovs_mutex_unlock(&dp->flow_mutex); return error; } static int dpif_netdev_flow_del(struct dpif *dpif, const struct dpif_flow_del *del) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_flow *netdev_flow; struct flow key; int error; error = dpif_netdev_flow_from_nlattrs(del->key, del->key_len, &key); if (error) { return error; } ovs_mutex_lock(&dp->flow_mutex); fat_rwlock_wrlock(&dp->cls.rwlock); netdev_flow = dp_netdev_find_flow(dp, &key); if (netdev_flow) { if (del->stats) { ovs_mutex_lock(&netdev_flow->mutex); get_dpif_flow_stats(netdev_flow, del->stats); ovs_mutex_unlock(&netdev_flow->mutex); } dp_netdev_remove_flow(dp, netdev_flow); } else { error = ENOENT; } fat_rwlock_unlock(&dp->cls.rwlock); ovs_mutex_unlock(&dp->flow_mutex); return error; } struct dp_netdev_flow_state { uint32_t bucket; uint32_t offset; struct dp_netdev_actions *actions; struct odputil_keybuf keybuf; struct odputil_keybuf maskbuf; struct dpif_flow_stats stats; }; static int dpif_netdev_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep) { struct dp_netdev_flow_state *state; *statep = state = xmalloc(sizeof *state); state->bucket = 0; state->offset = 0; state->actions = NULL; return 0; } static int dpif_netdev_flow_dump_next(const struct dpif *dpif, void *state_, const struct nlattr **key, size_t *key_len, const struct nlattr **mask, size_t *mask_len, const struct nlattr **actions, size_t *actions_len, const struct dpif_flow_stats **stats) { struct dp_netdev_flow_state *state = state_; struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_flow *netdev_flow; struct hmap_node *node; fat_rwlock_rdlock(&dp->cls.rwlock); node = hmap_at_position(&dp->flow_table, &state->bucket, &state->offset); if (node) { netdev_flow = CONTAINER_OF(node, struct dp_netdev_flow, node); dp_netdev_flow_ref(netdev_flow); } fat_rwlock_unlock(&dp->cls.rwlock); if (!node) { return EOF; } if (key) { struct ofpbuf buf; ofpbuf_use_stack(&buf, &state->keybuf, sizeof state->keybuf); odp_flow_key_from_flow(&buf, &netdev_flow->flow, netdev_flow->flow.in_port.odp_port); *key = buf.data; *key_len = buf.size; } if (key && mask) { struct ofpbuf buf; struct flow_wildcards wc; ofpbuf_use_stack(&buf, &state->maskbuf, sizeof state->maskbuf); minimask_expand(&netdev_flow->cr.match.mask, &wc); odp_flow_key_from_mask(&buf, &wc.masks, &netdev_flow->flow, odp_to_u32(wc.masks.in_port.odp_port), SIZE_MAX); *mask = buf.data; *mask_len = buf.size; } if (actions || stats) { dp_netdev_actions_unref(state->actions); state->actions = NULL; ovs_mutex_lock(&netdev_flow->mutex); if (actions) { state->actions = dp_netdev_actions_ref(netdev_flow->actions); *actions = state->actions->actions; *actions_len = state->actions->size; } if (stats) { get_dpif_flow_stats(netdev_flow, &state->stats); *stats = &state->stats; } ovs_mutex_unlock(&netdev_flow->mutex); } dp_netdev_flow_unref(netdev_flow); return 0; } static int dpif_netdev_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_) { struct dp_netdev_flow_state *state = state_; dp_netdev_actions_unref(state->actions); free(state); return 0; } static int dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute) { struct dp_netdev *dp = get_dp_netdev(dpif); struct pkt_metadata *md = &execute->md; struct flow key; if (execute->packet->size < ETH_HEADER_LEN || execute->packet->size > UINT16_MAX) { return EINVAL; } /* Extract flow key. */ flow_extract(execute->packet, md->skb_priority, md->pkt_mark, &md->tunnel, (union flow_in_port *)&md->in_port, &key); ovs_rwlock_rdlock(&dp->port_rwlock); dp_netdev_execute_actions(dp, &key, execute->packet, md, execute->actions, execute->actions_len); ovs_rwlock_unlock(&dp->port_rwlock); return 0; } static int dpif_netdev_recv_set(struct dpif *dpif OVS_UNUSED, bool enable OVS_UNUSED) { return 0; } static int dpif_netdev_queue_to_priority(const struct dpif *dpif OVS_UNUSED, uint32_t queue_id, uint32_t *priority) { *priority = queue_id; return 0; } static struct dp_netdev_queue * find_nonempty_queue(struct dp_netdev *dp) OVS_REQUIRES(dp->queue_mutex) { int i; for (i = 0; i < N_QUEUES; i++) { struct dp_netdev_queue *q = &dp->queues[i]; if (q->head != q->tail) { return q; } } return NULL; } static int dpif_netdev_recv(struct dpif *dpif, struct dpif_upcall *upcall, struct ofpbuf *buf) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dp_netdev_queue *q; int error; ovs_mutex_lock(&dp->queue_mutex); q = find_nonempty_queue(dp); if (q) { struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK]; *upcall = u->upcall; ofpbuf_uninit(buf); *buf = u->buf; error = 0; } else { error = EAGAIN; } ovs_mutex_unlock(&dp->queue_mutex); return error; } static void dpif_netdev_recv_wait(struct dpif *dpif) { struct dp_netdev *dp = get_dp_netdev(dpif); uint64_t seq; ovs_mutex_lock(&dp->queue_mutex); seq = seq_read(dp->queue_seq); if (find_nonempty_queue(dp)) { poll_immediate_wake(); } else { seq_wait(dp->queue_seq, seq); } ovs_mutex_unlock(&dp->queue_mutex); } static void dpif_netdev_recv_purge(struct dpif *dpif) { struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif); dp_netdev_purge_queues(dpif_netdev->dp); } /* Creates and returns a new 'struct dp_netdev_actions', with a reference count * of 1, whose actions are a copy of from the 'ofpacts_len' bytes of * 'ofpacts'. */ struct dp_netdev_actions * dp_netdev_actions_create(const struct nlattr *actions, size_t size) { struct dp_netdev_actions *netdev_actions; netdev_actions = xmalloc(sizeof *netdev_actions); ovs_refcount_init(&netdev_actions->ref_cnt); netdev_actions->actions = xmemdup(actions, size); netdev_actions->size = size; return netdev_actions; } /* Increments 'actions''s refcount. */ struct dp_netdev_actions * dp_netdev_actions_ref(const struct dp_netdev_actions *actions_) { struct dp_netdev_actions *actions; actions = CONST_CAST(struct dp_netdev_actions *, actions_); if (actions) { ovs_refcount_ref(&actions->ref_cnt); } return actions; } /* Decrements 'actions''s refcount and frees 'actions' if the refcount reaches * 0. */ void dp_netdev_actions_unref(struct dp_netdev_actions *actions) { if (actions && ovs_refcount_unref(&actions->ref_cnt) == 1) { free(actions->actions); free(actions); } } static void * dp_forwarder_main(void *f_) { struct dp_forwarder *f = f_; struct dp_netdev *dp = f->dp; struct ofpbuf packet; f->name = xasprintf("forwarder_%u", ovsthread_id_self()); set_subprogram_name("%s", f->name); ofpbuf_init(&packet, 0); while (!latch_is_set(&dp->exit_latch)) { bool received_anything; int i; ovs_rwlock_rdlock(&dp->port_rwlock); for (i = 0; i < 50; i++) { struct dp_netdev_port *port; received_anything = false; HMAP_FOR_EACH (port, node, &f->dp->ports) { if (port->rx && port->node.hash >= f->min_hash && port->node.hash <= f->max_hash) { int buf_size; int error; int mtu; if (netdev_get_mtu(port->netdev, &mtu)) { mtu = ETH_PAYLOAD_MAX; } buf_size = DP_NETDEV_HEADROOM + VLAN_ETH_HEADER_LEN + mtu; ofpbuf_clear(&packet); ofpbuf_reserve_with_tailroom(&packet, DP_NETDEV_HEADROOM, buf_size); error = netdev_rx_recv(port->rx, &packet); if (!error) { struct pkt_metadata md = PKT_METADATA_INITIALIZER(port->port_no); dp_netdev_port_input(dp, &packet, &md); received_anything = true; } else if (error != EAGAIN && error != EOPNOTSUPP) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_ERR_RL(&rl, "error receiving data from %s: %s", netdev_get_name(port->netdev), ovs_strerror(error)); } } } if (!received_anything) { break; } } if (received_anything) { poll_immediate_wake(); } else { struct dp_netdev_port *port; HMAP_FOR_EACH (port, node, &f->dp->ports) if (port->rx && port->node.hash >= f->min_hash && port->node.hash <= f->max_hash) { netdev_rx_wait(port->rx); } seq_wait(dp->port_seq, seq_read(dp->port_seq)); latch_wait(&dp->exit_latch); } ovs_rwlock_unlock(&dp->port_rwlock); poll_block(); } ofpbuf_uninit(&packet); free(f->name); return NULL; } static void dp_netdev_set_threads(struct dp_netdev *dp, int n) { int i; if (n == dp->n_forwarders) { return; } /* Stop existing threads. */ latch_set(&dp->exit_latch); for (i = 0; i < dp->n_forwarders; i++) { struct dp_forwarder *f = &dp->forwarders[i]; xpthread_join(f->thread, NULL); } latch_poll(&dp->exit_latch); free(dp->forwarders); /* Start new threads. */ dp->forwarders = xmalloc(n * sizeof *dp->forwarders); dp->n_forwarders = n; for (i = 0; i < n; i++) { struct dp_forwarder *f = &dp->forwarders[i]; f->dp = dp; f->min_hash = UINT32_MAX / n * i; f->max_hash = UINT32_MAX / n * (i + 1) - 1; if (i == n - 1) { f->max_hash = UINT32_MAX; } xpthread_create(&f->thread, NULL, dp_forwarder_main, f); } } static void dp_netdev_flow_used(struct dp_netdev_flow *netdev_flow, const struct ofpbuf *packet) OVS_REQUIRES(netdev_flow->mutex) { netdev_flow->used = time_msec(); netdev_flow->packet_count++; netdev_flow->byte_count += packet->size; netdev_flow->tcp_flags |= packet_get_tcp_flags(packet, &netdev_flow->flow); } static void dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet, struct pkt_metadata *md) OVS_REQ_RDLOCK(dp->port_rwlock) { struct dp_netdev_flow *netdev_flow; struct flow key; if (packet->size < ETH_HEADER_LEN) { return; } flow_extract(packet, md->skb_priority, md->pkt_mark, &md->tunnel, (union flow_in_port *)&md->in_port, &key); netdev_flow = dp_netdev_lookup_flow(dp, &key); if (netdev_flow) { struct dp_netdev_actions *actions; ovs_mutex_lock(&netdev_flow->mutex); dp_netdev_flow_used(netdev_flow, packet); actions = dp_netdev_actions_ref(netdev_flow->actions); ovs_mutex_unlock(&netdev_flow->mutex); dp_netdev_execute_actions(dp, &key, packet, md, actions->actions, actions->size); dp_netdev_actions_unref(actions); ovsthread_counter_inc(dp->n_hit, 1); } else { ovsthread_counter_inc(dp->n_missed, 1); dp_netdev_output_userspace(dp, packet, DPIF_UC_MISS, &key, NULL); } } static int dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *packet, int queue_no, const struct flow *flow, const struct nlattr *userdata) OVS_EXCLUDED(dp->queue_mutex) { struct dp_netdev_queue *q = &dp->queues[queue_no]; int error; ovs_mutex_lock(&dp->queue_mutex); if (q->head - q->tail < MAX_QUEUE_LEN) { struct dp_netdev_upcall *u = &q->upcalls[q->head++ & QUEUE_MASK]; struct dpif_upcall *upcall = &u->upcall; struct ofpbuf *buf = &u->buf; size_t buf_size; upcall->type = queue_no; /* Allocate buffer big enough for everything. */ buf_size = ODPUTIL_FLOW_KEY_BYTES; if (userdata) { buf_size += NLA_ALIGN(userdata->nla_len); } ofpbuf_init(buf, buf_size); /* Put ODP flow. */ odp_flow_key_from_flow(buf, flow, flow->in_port.odp_port); upcall->key = buf->data; upcall->key_len = buf->size; /* Put userdata. */ if (userdata) { upcall->userdata = ofpbuf_put(buf, userdata, NLA_ALIGN(userdata->nla_len)); } /* Steal packet data. */ ovs_assert(packet->source == OFPBUF_MALLOC); upcall->packet = *packet; ofpbuf_use(packet, NULL, 0); seq_change(dp->queue_seq); error = 0; } else { ovsthread_counter_inc(dp->n_lost, 1); error = ENOBUFS; } ovs_mutex_unlock(&dp->queue_mutex); return error; } struct dp_netdev_execute_aux { struct dp_netdev *dp; const struct flow *key; }; static void dp_execute_cb(void *aux_, struct ofpbuf *packet, const struct pkt_metadata *md OVS_UNUSED, const struct nlattr *a, bool may_steal) OVS_NO_THREAD_SAFETY_ANALYSIS { struct dp_netdev_execute_aux *aux = aux_; int type = nl_attr_type(a); struct dp_netdev_port *p; switch ((enum ovs_action_attr)type) { case OVS_ACTION_ATTR_OUTPUT: p = dp_netdev_lookup_port(aux->dp, u32_to_odp(nl_attr_get_u32(a))); if (p) { netdev_send(p->netdev, packet); } break; case OVS_ACTION_ATTR_USERSPACE: { const struct nlattr *userdata; userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA); /* Make a copy if we are not allowed to steal the packet's data. */ if (!may_steal) { packet = ofpbuf_clone_with_headroom(packet, DP_NETDEV_HEADROOM); } dp_netdev_output_userspace(aux->dp, packet, DPIF_UC_ACTION, aux->key, userdata); if (!may_steal) { ofpbuf_uninit(packet); } break; } case OVS_ACTION_ATTR_PUSH_VLAN: case OVS_ACTION_ATTR_POP_VLAN: case OVS_ACTION_ATTR_PUSH_MPLS: case OVS_ACTION_ATTR_POP_MPLS: case OVS_ACTION_ATTR_SET: case OVS_ACTION_ATTR_SAMPLE: case OVS_ACTION_ATTR_UNSPEC: case __OVS_ACTION_ATTR_MAX: OVS_NOT_REACHED(); } } static void dp_netdev_execute_actions(struct dp_netdev *dp, const struct flow *key, struct ofpbuf *packet, struct pkt_metadata *md, const struct nlattr *actions, size_t actions_len) OVS_REQ_RDLOCK(dp->port_rwlock) { struct dp_netdev_execute_aux aux = {dp, key}; odp_execute_actions(&aux, packet, md, actions, actions_len, dp_execute_cb); } #define DPIF_NETDEV_CLASS_FUNCTIONS \ dpif_netdev_enumerate, \ dpif_netdev_port_open_type, \ dpif_netdev_open, \ dpif_netdev_close, \ dpif_netdev_destroy, \ NULL, \ NULL, \ dpif_netdev_get_stats, \ dpif_netdev_port_add, \ dpif_netdev_port_del, \ dpif_netdev_port_query_by_number, \ dpif_netdev_port_query_by_name, \ NULL, /* port_get_pid */ \ dpif_netdev_port_dump_start, \ dpif_netdev_port_dump_next, \ dpif_netdev_port_dump_done, \ dpif_netdev_port_poll, \ dpif_netdev_port_poll_wait, \ dpif_netdev_flow_get, \ dpif_netdev_flow_put, \ dpif_netdev_flow_del, \ dpif_netdev_flow_flush, \ dpif_netdev_flow_dump_start, \ dpif_netdev_flow_dump_next, \ dpif_netdev_flow_dump_done, \ dpif_netdev_execute, \ NULL, /* operate */ \ dpif_netdev_recv_set, \ dpif_netdev_queue_to_priority, \ dpif_netdev_recv, \ dpif_netdev_recv_wait, \ dpif_netdev_recv_purge, \ const struct dpif_class dpif_netdev_class = { "netdev", DPIF_NETDEV_CLASS_FUNCTIONS }; const struct dpif_class dpif_planetlab_class = { "planetlab", DPIF_NETDEV_CLASS_FUNCTIONS }; static void dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED, const char *argv[], void *aux OVS_UNUSED) { struct dp_netdev_port *port; struct dp_netdev *dp; odp_port_t port_no; ovs_mutex_lock(&dp_netdev_mutex); dp = shash_find_data(&dp_netdevs, argv[1]); if (!dp || !dpif_netdev_class_is_dummy(dp->class)) { ovs_mutex_unlock(&dp_netdev_mutex); unixctl_command_reply_error(conn, "unknown datapath or not a dummy"); return; } ovs_refcount_ref(&dp->ref_cnt); ovs_mutex_unlock(&dp_netdev_mutex); ovs_rwlock_wrlock(&dp->port_rwlock); if (get_port_by_name(dp, argv[2], &port)) { unixctl_command_reply_error(conn, "unknown port"); goto exit; } port_no = u32_to_odp(atoi(argv[3])); if (!port_no || port_no == ODPP_NONE) { unixctl_command_reply_error(conn, "bad port number"); goto exit; } if (dp_netdev_lookup_port(dp, port_no)) { unixctl_command_reply_error(conn, "port number already in use"); goto exit; } hmap_remove(&dp->ports, &port->node); port->port_no = port_no; hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0)); seq_change(dp->port_seq); unixctl_command_reply(conn, NULL); exit: ovs_rwlock_unlock(&dp->port_rwlock); dp_netdev_unref(dp); } static void dpif_dummy_register__(const char *type) { struct dpif_class *class; class = xmalloc(sizeof *class); *class = dpif_netdev_class; class->type = xstrdup(type); dp_register_provider(class); } void dpif_dummy_register(bool override) { if (override) { struct sset types; const char *type; sset_init(&types); dp_enumerate_types(&types); SSET_FOR_EACH (type, &types) { if (!dp_unregister_provider(type)) { dpif_dummy_register__(type); } } sset_destroy(&types); } dpif_dummy_register__("dummy"); unixctl_command_register("dpif-dummy/change-port-number", "DP PORT NEW-NUMBER", 3, 3, dpif_dummy_change_port_number, NULL); }