/* * 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-netdev.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "classifier.h" #include "cmap.h" #include "csum.h" #include "dpif.h" #include "dpif-provider.h" #include "dummy.h" #include "dynamic-string.h" #include "fat-rwlock.h" #include "flow.h" #include "cmap.h" #include "latch.h" #include "list.h" #include "meta-flow.h" #include "netdev.h" #include "netdev-dpdk.h" #include "netdev-vport.h" #include "netlink.h" #include "odp-execute.h" #include "odp-util.h" #include "ofp-print.h" #include "ofpbuf.h" #include "ovs-rcu.h" #include "packet-dpif.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 #define FLOW_DUMP_MAX_BATCH 50 /* Use per thread recirc_depth to prevent recirculation loop. */ #define MAX_RECIRC_DEPTH 5 DEFINE_STATIC_PER_THREAD_DATA(uint32_t, recirc_depth, 0) /* Configuration parameters. */ enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */ /* 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_queue { unsigned int packet_count; struct dpif_upcall upcalls[NETDEV_MAX_RX_BATCH]; struct ofpbuf bufs[NETDEV_MAX_RX_BATCH]; }; #define DP_NETDEV_QUEUE_INITIALIZER { .packet_count = 0 } /* 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_mutex * flow_mutex */ struct dp_netdev { const struct dpif_class *const class; const char *const name; struct dpif *dpif; struct ovs_refcount ref_cnt; atomic_flag destroyed; /* Flows. * * Writers of 'flow_table' must take the 'flow_mutex'. Corresponding * changes to 'cls' must be made while still holding the 'flow_mutex'. */ struct ovs_mutex flow_mutex; struct classifier cls; struct cmap flow_table OVS_GUARDED; /* Flow table. */ /* Statistics. * * ovsthread_stats is internally synchronized. */ struct ovsthread_stats stats; /* Contains 'struct dp_netdev_stats *'. */ /* Ports. * * Protected by RCU. Take the mutex to add or remove ports. */ struct ovs_mutex port_mutex; struct cmap ports; struct seq *port_seq; /* Incremented whenever a port changes. */ /* Protects access to ofproto-dpif-upcall interface during revalidator * thread synchronization. */ struct fat_rwlock upcall_rwlock; exec_upcall_cb *upcall_cb; /* Callback function for executing upcalls. */ /* Forwarding threads. */ struct latch exit_latch; struct pmd_thread *pmd_threads; size_t n_pmd_threads; int pmd_count; }; static struct dp_netdev_port *dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t); enum dp_stat_type { DP_STAT_HIT, /* Packets that matched in the flow table. */ DP_STAT_MISS, /* Packets that did not match. */ DP_STAT_LOST, /* Packets not passed up to the client. */ DP_N_STATS }; /* Contained by struct dp_netdev's 'stats' member. */ struct dp_netdev_stats { struct ovs_mutex mutex; /* Protects 'n'. */ /* Indexed by DP_STAT_*, protected by 'mutex'. */ unsigned long long int n[DP_N_STATS] OVS_GUARDED; }; /* A port in a netdev-based datapath. */ struct dp_netdev_port { struct cmap_node node; /* Node in dp_netdev's 'ports'. */ odp_port_t port_no; struct netdev *netdev; struct netdev_saved_flags *sf; struct netdev_rxq **rxq; struct ovs_refcount ref_cnt; char *type; /* Port type as requested by user. */ }; /* Stores a miniflow */ /* There are fields in the flow structure that we never use. Therefore we can * save a few words of memory */ #define NETDEV_KEY_BUF_SIZE_U32 (FLOW_U32S - MINI_N_INLINE \ - FLOW_U32_SIZE(regs) \ - FLOW_U32_SIZE(metadata) \ ) struct netdev_flow_key { struct miniflow flow; uint32_t buf[NETDEV_KEY_BUF_SIZE_U32]; }; /* 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. * * 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 cmap_node node; /* In owning dp_netdev's 'flow_table'. */ const struct flow flow; /* The flow that created this entry. */ /* Statistics. * * Reading or writing these members requires 'mutex'. */ struct ovsthread_stats stats; /* Contains "struct dp_netdev_flow_stats". */ /* Actions. */ OVSRCU_TYPE(struct dp_netdev_actions *) actions; }; static void dp_netdev_flow_free(struct dp_netdev_flow *); /* Contained by struct dp_netdev_flow's 'stats' member. */ struct dp_netdev_flow_stats { struct ovs_mutex mutex; /* Guards all the other members. */ 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. */ }; /* A set of datapath actions within a "struct dp_netdev_flow". * * * Thread-safety * ============= * * A struct dp_netdev_actions 'actions' is protected with RCU. */ struct dp_netdev_actions { /* 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_flow_get_actions( const struct dp_netdev_flow *); static void dp_netdev_actions_free(struct dp_netdev_actions *); /* PMD: Poll modes drivers. PMD accesses devices via polling to eliminate * the performance overhead of interrupt processing. Therefore netdev can * not implement rx-wait for these devices. dpif-netdev needs to poll * these device to check for recv buffer. pmd-thread does polling for * devices assigned to itself thread. * * DPDK used PMD for accessing NIC. * * A thread that receives packets from PMD ports, looks them up in the flow * table, and executes the actions it finds. **/ struct pmd_thread { struct dp_netdev *dp; pthread_t thread; int id; atomic_uint change_seq; }; /* 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); static int get_port_by_name(struct dp_netdev *dp, const char *devname, struct dp_netdev_port **portp); 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_REQUIRES(dp->port_mutex); static void do_del_port(struct dp_netdev *dp, struct dp_netdev_port *) OVS_REQUIRES(dp->port_mutex); static int dpif_netdev_open(const struct dpif_class *, const char *name, bool create, struct dpif **); static int dp_netdev_queue_userspace_packet(struct dp_netdev_queue *, struct ofpbuf *, int type, const struct miniflow *, const struct nlattr *); static void dp_netdev_execute_userspace_queue(struct dp_netdev_queue *, struct dp_netdev *); static void dp_netdev_execute_actions(struct dp_netdev *dp, struct dpif_packet **, int c, bool may_steal, struct pkt_metadata *, const struct nlattr *actions, size_t actions_len); static void dp_netdev_port_input(struct dp_netdev *dp, struct dpif_packet **packets, int cnt, odp_port_t port_no); static void dp_netdev_set_pmd_threads(struct dp_netdev *, int n); static void dp_netdev_disable_upcall(struct dp_netdev *); 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, const struct dpif_class *dpif_class) { struct shash_node *node; ovs_mutex_lock(&dp_netdev_mutex); SHASH_FOR_EACH(node, &dp_netdevs) { struct dp_netdev *dp = node->data; if (dpif_class != dp->class) { /* 'dp_netdevs' contains both "netdev" and "dummy" dpifs. * If the class doesn't match, skip this dpif. */ continue; } 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 const char * dpif_netdev_port_open_type(const struct dpif_class *class, const char *type) { return strcmp(type, "internal") ? type : 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_REQUIRES(dp->port_mutex) { uint32_t port_no; if (dp->class != &dpif_netdev_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; 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_clear(&dp->destroyed); ovs_mutex_init(&dp->flow_mutex); classifier_init(&dp->cls, NULL); cmap_init(&dp->flow_table); ovsthread_stats_init(&dp->stats); ovs_mutex_init(&dp->port_mutex); cmap_init(&dp->ports); dp->port_seq = seq_create(); latch_init(&dp->exit_latch); fat_rwlock_init(&dp->upcall_rwlock); /* Disable upcalls by default. */ dp_netdev_disable_upcall(dp); dp->upcall_cb = NULL; ovs_mutex_lock(&dp->port_mutex); error = do_add_port(dp, name, "internal", ODPP_LOCAL); ovs_mutex_unlock(&dp->port_mutex); if (error) { dp_netdev_free(dp); return error; } *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); dp->dpif = *dpifp; } ovs_mutex_unlock(&dp_netdev_mutex); return error; } /* 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; struct dp_netdev_stats *bucket; int i; shash_find_and_delete(&dp_netdevs, dp->name); dp_netdev_set_pmd_threads(dp, 0); free(dp->pmd_threads); dp_netdev_flow_flush(dp); ovs_mutex_lock(&dp->port_mutex); CMAP_FOR_EACH (port, node, &dp->ports) { do_del_port(dp, port); } ovs_mutex_unlock(&dp->port_mutex); OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &dp->stats) { ovs_mutex_destroy(&bucket->mutex); free_cacheline(bucket); } ovsthread_stats_destroy(&dp->stats); classifier_destroy(&dp->cls); cmap_destroy(&dp->flow_table); ovs_mutex_destroy(&dp->flow_mutex); seq_destroy(dp->port_seq); cmap_destroy(&dp->ports); fat_rwlock_destroy(&dp->upcall_rwlock); 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_relaxed(&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_relaxed(&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); struct dp_netdev_stats *bucket; size_t i; stats->n_flows = cmap_count(&dp->flow_table); stats->n_hit = stats->n_missed = stats->n_lost = 0; OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &dp->stats) { ovs_mutex_lock(&bucket->mutex); stats->n_hit += bucket->n[DP_STAT_HIT]; stats->n_missed += bucket->n[DP_STAT_MISS]; stats->n_lost += bucket->n[DP_STAT_LOST]; ovs_mutex_unlock(&bucket->mutex); } stats->n_masks = UINT32_MAX; stats->n_mask_hit = UINT64_MAX; return 0; } static void dp_netdev_reload_pmd_threads(struct dp_netdev *dp) { int i; for (i = 0; i < dp->n_pmd_threads; i++) { struct pmd_thread *f = &dp->pmd_threads[i]; int id; atomic_add(&f->change_seq, 1, &id); } } static uint32_t hash_port_no(odp_port_t port_no) { return hash_int(odp_to_u32(port_no), 0); } static int do_add_port(struct dp_netdev *dp, const char *devname, const char *type, odp_port_t port_no) OVS_REQUIRES(dp->port_mutex) { struct netdev_saved_flags *sf; struct dp_netdev_port *port; struct netdev *netdev; enum netdev_flags flags; const char *open_type; int error; int i; /* 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; } port = xzalloc(sizeof *port); port->port_no = port_no; port->netdev = netdev; port->rxq = xmalloc(sizeof *port->rxq * netdev_n_rxq(netdev)); port->type = xstrdup(type); for (i = 0; i < netdev_n_rxq(netdev); i++) { error = netdev_rxq_open(netdev, &port->rxq[i], i); 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) { for (i = 0; i < netdev_n_rxq(netdev); i++) { netdev_rxq_close(port->rxq[i]); } netdev_close(netdev); free(port->rxq); free(port); return error; } port->sf = sf; if (netdev_is_pmd(netdev)) { dp->pmd_count++; dp_netdev_set_pmd_threads(dp, NR_PMD_THREADS); dp_netdev_reload_pmd_threads(dp); } ovs_refcount_init(&port->ref_cnt); cmap_insert(&dp->ports, &port->node, hash_port_no(port_no)); 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_mutex_lock(&dp->port_mutex); 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_mutex_unlock(&dp->port_mutex); 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_mutex_lock(&dp->port_mutex); if (port_no == ODPP_LOCAL) { error = EINVAL; } else { struct dp_netdev_port *port; error = get_port_by_number(dp, port_no, &port); if (!error) { do_del_port(dp, port); } } ovs_mutex_unlock(&dp->port_mutex); 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) { struct dp_netdev_port *port; CMAP_FOR_EACH_WITH_HASH (port, node, hash_port_no(port_no), &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) { 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 void port_ref(struct dp_netdev_port *port) { if (port) { ovs_refcount_ref(&port->ref_cnt); } } static void port_destroy__(struct dp_netdev_port *port) { int n_rxq = netdev_n_rxq(port->netdev); int i; netdev_close(port->netdev); netdev_restore_flags(port->sf); for (i = 0; i < n_rxq; i++) { netdev_rxq_close(port->rxq[i]); } free(port->rxq); free(port->type); free(port); } static void port_unref(struct dp_netdev_port *port) { if (port && ovs_refcount_unref_relaxed(&port->ref_cnt) == 1) { ovsrcu_postpone(port_destroy__, port); } } static int get_port_by_name(struct dp_netdev *dp, const char *devname, struct dp_netdev_port **portp) OVS_REQUIRES(dp->port_mutex) { struct dp_netdev_port *port; CMAP_FOR_EACH (port, node, &dp->ports) { if (!strcmp(netdev_get_name(port->netdev), devname)) { *portp = port; return 0; } } return ENOENT; } static void do_del_port(struct dp_netdev *dp, struct dp_netdev_port *port) OVS_REQUIRES(dp->port_mutex) { cmap_remove(&dp->ports, &port->node, hash_odp_port(port->port_no)); seq_change(dp->port_seq); if (netdev_is_pmd(port->netdev)) { dp_netdev_reload_pmd_threads(dp); } port_unref(port); } 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; error = get_port_by_number(dp, port_no, &port); if (!error && dpif_port) { answer_port_query(port, dpif_port); } 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_mutex_lock(&dp->port_mutex); error = get_port_by_name(dp, devname, &port); if (!error && dpif_port) { answer_port_query(port, dpif_port); } ovs_mutex_unlock(&dp->port_mutex); return error; } static void dp_netdev_flow_free(struct dp_netdev_flow *flow) { struct dp_netdev_flow_stats *bucket; size_t i; OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &flow->stats) { ovs_mutex_destroy(&bucket->mutex); free_cacheline(bucket); } ovsthread_stats_destroy(&flow->stats); cls_rule_destroy(CONST_CAST(struct cls_rule *, &flow->cr)); dp_netdev_actions_free(dp_netdev_flow_get_actions(flow)); free(flow); } static void dp_netdev_remove_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow) OVS_REQUIRES(dp->flow_mutex) { struct cls_rule *cr = CONST_CAST(struct cls_rule *, &flow->cr); struct cmap_node *node = CONST_CAST(struct cmap_node *, &flow->node); classifier_remove(&dp->cls, cr); cmap_remove(&dp->flow_table, node, flow_hash(&flow->flow, 0)); ovsrcu_postpone(dp_netdev_flow_free, flow); } static void dp_netdev_flow_flush(struct dp_netdev *dp) { struct dp_netdev_flow *netdev_flow; ovs_mutex_lock(&dp->flow_mutex); CMAP_FOR_EACH (netdev_flow, node, &dp->flow_table) { dp_netdev_remove_flow(dp, netdev_flow); } 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 { struct cmap_position position; 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 cmap_node *node; int retval; node = cmap_next_position(&dp->ports, &state->position); 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; } 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 miniflow *key) { struct dp_netdev_flow *netdev_flow; struct cls_rule *rule; classifier_lookup_miniflow_batch(&dp->cls, &key, &rule, 1); netdev_flow = dp_netdev_flow_cast(rule); return netdev_flow; } static struct dp_netdev_flow * dp_netdev_find_flow(const struct dp_netdev *dp, const struct flow *flow) { struct dp_netdev_flow *netdev_flow; CMAP_FOR_EACH_WITH_HASH (netdev_flow, node, flow_hash(flow, 0), &dp->flow_table) { if (flow_equal(&netdev_flow->flow, flow)) { return netdev_flow; } } return NULL; } static void get_dpif_flow_stats(struct dp_netdev_flow *netdev_flow, struct dpif_flow_stats *stats) { struct dp_netdev_flow_stats *bucket; size_t i; memset(stats, 0, sizeof *stats); OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &netdev_flow->stats) { ovs_mutex_lock(&bucket->mutex); stats->n_packets += bucket->packet_count; stats->n_bytes += bucket->byte_count; stats->used = MAX(stats->used, bucket->used); stats->tcp_flags |= bucket->tcp_flags; ovs_mutex_unlock(&bucket->mutex); } } 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; } } 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); } } } } /* Force unwildcard the in_port. * * We need to do this even in the case where we unwildcard "everything" * above because "everything" only includes the 16-bit OpenFlow port number * mask->in_port.ofp_port, which only covers half of the 32-bit datapath * port number mask->in_port.odp_port. */ mask->in_port.odp_port = u32_to_odp(UINT32_MAX); 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 **bufp, struct nlattr **maskp, size_t *mask_len, struct nlattr **actionsp, size_t *actions_len, 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; } netdev_flow = dp_netdev_find_flow(dp, &key); if (netdev_flow) { if (stats) { get_dpif_flow_stats(netdev_flow, stats); } if (maskp) { struct flow_wildcards wc; *bufp = ofpbuf_new(sizeof(struct odputil_keybuf)); minimask_expand(&netdev_flow->cr.match.mask, &wc); odp_flow_key_from_mask(*bufp, &wc.masks, &netdev_flow->flow, odp_to_u32(wc.masks.in_port.odp_port), SIZE_MAX, true); *maskp = ofpbuf_data(*bufp); *mask_len = ofpbuf_size(*bufp); } if (actionsp) { struct dp_netdev_actions *actions; actions = dp_netdev_flow_get_actions(netdev_flow); *actionsp = actions->actions; *actions_len = actions->size; } } 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; ovsthread_stats_init(&netdev_flow->stats); ovsrcu_set(&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); cmap_insert(&dp->flow_table, CONST_CAST(struct cmap_node *, &netdev_flow->node), flow_hash(flow, 0)); classifier_insert(&dp->cls, CONST_CAST(struct cls_rule *, &netdev_flow->cr)); return 0; } static void clear_stats(struct dp_netdev_flow *netdev_flow) { struct dp_netdev_flow_stats *bucket; size_t i; OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &netdev_flow->stats) { ovs_mutex_lock(&bucket->mutex); bucket->used = 0; bucket->packet_count = 0; bucket->byte_count = 0; bucket->tcp_flags = 0; ovs_mutex_unlock(&bucket->mutex); } } 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 miniflow miniflow; 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; } miniflow_init(&miniflow, &flow); ovs_mutex_lock(&dp->flow_mutex); netdev_flow = dp_netdev_lookup_flow(dp, &miniflow); if (!netdev_flow) { if (put->flags & DPIF_FP_CREATE) { if (cmap_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); old_actions = dp_netdev_flow_get_actions(netdev_flow); ovsrcu_set(&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); } ovsrcu_postpone(dp_netdev_actions_free, old_actions); } else if (put->flags & DPIF_FP_CREATE) { error = EEXIST; } else { /* Overlapping flow. */ error = EINVAL; } } ovs_mutex_unlock(&dp->flow_mutex); miniflow_destroy(&miniflow); 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); netdev_flow = dp_netdev_find_flow(dp, &key); if (netdev_flow) { if (del->stats) { get_dpif_flow_stats(netdev_flow, del->stats); } dp_netdev_remove_flow(dp, netdev_flow); } else { error = ENOENT; } ovs_mutex_unlock(&dp->flow_mutex); return error; } struct dpif_netdev_flow_dump { struct dpif_flow_dump up; struct cmap_position pos; int status; struct ovs_mutex mutex; }; static struct dpif_netdev_flow_dump * dpif_netdev_flow_dump_cast(struct dpif_flow_dump *dump) { return CONTAINER_OF(dump, struct dpif_netdev_flow_dump, up); } static struct dpif_flow_dump * dpif_netdev_flow_dump_create(const struct dpif *dpif_) { struct dpif_netdev_flow_dump *dump; dump = xmalloc(sizeof *dump); dpif_flow_dump_init(&dump->up, dpif_); memset(&dump->pos, 0, sizeof dump->pos); dump->status = 0; ovs_mutex_init(&dump->mutex); return &dump->up; } static int dpif_netdev_flow_dump_destroy(struct dpif_flow_dump *dump_) { struct dpif_netdev_flow_dump *dump = dpif_netdev_flow_dump_cast(dump_); ovs_mutex_destroy(&dump->mutex); free(dump); return 0; } struct dpif_netdev_flow_dump_thread { struct dpif_flow_dump_thread up; struct dpif_netdev_flow_dump *dump; struct odputil_keybuf keybuf[FLOW_DUMP_MAX_BATCH]; struct odputil_keybuf maskbuf[FLOW_DUMP_MAX_BATCH]; }; static struct dpif_netdev_flow_dump_thread * dpif_netdev_flow_dump_thread_cast(struct dpif_flow_dump_thread *thread) { return CONTAINER_OF(thread, struct dpif_netdev_flow_dump_thread, up); } static struct dpif_flow_dump_thread * dpif_netdev_flow_dump_thread_create(struct dpif_flow_dump *dump_) { struct dpif_netdev_flow_dump *dump = dpif_netdev_flow_dump_cast(dump_); struct dpif_netdev_flow_dump_thread *thread; thread = xmalloc(sizeof *thread); dpif_flow_dump_thread_init(&thread->up, &dump->up); thread->dump = dump; return &thread->up; } static void dpif_netdev_flow_dump_thread_destroy(struct dpif_flow_dump_thread *thread_) { struct dpif_netdev_flow_dump_thread *thread = dpif_netdev_flow_dump_thread_cast(thread_); free(thread); } static int dpif_netdev_flow_dump_next(struct dpif_flow_dump_thread *thread_, struct dpif_flow *flows, int max_flows) { struct dpif_netdev_flow_dump_thread *thread = dpif_netdev_flow_dump_thread_cast(thread_); struct dpif_netdev_flow_dump *dump = thread->dump; struct dpif_netdev *dpif = dpif_netdev_cast(thread->up.dpif); struct dp_netdev_flow *netdev_flows[FLOW_DUMP_MAX_BATCH]; struct dp_netdev *dp = get_dp_netdev(&dpif->dpif); int n_flows = 0; int i; ovs_mutex_lock(&dump->mutex); if (!dump->status) { for (n_flows = 0; n_flows < MIN(max_flows, FLOW_DUMP_MAX_BATCH); n_flows++) { struct cmap_node *node; node = cmap_next_position(&dp->flow_table, &dump->pos); if (!node) { dump->status = EOF; break; } netdev_flows[n_flows] = CONTAINER_OF(node, struct dp_netdev_flow, node); } } ovs_mutex_unlock(&dump->mutex); for (i = 0; i < n_flows; i++) { struct odputil_keybuf *maskbuf = &thread->maskbuf[i]; struct odputil_keybuf *keybuf = &thread->keybuf[i]; struct dp_netdev_flow *netdev_flow = netdev_flows[i]; struct dpif_flow *f = &flows[i]; struct dp_netdev_actions *dp_actions; struct flow_wildcards wc; struct ofpbuf buf; minimask_expand(&netdev_flow->cr.match.mask, &wc); /* Key. */ ofpbuf_use_stack(&buf, keybuf, sizeof *keybuf); odp_flow_key_from_flow(&buf, &netdev_flow->flow, &wc.masks, netdev_flow->flow.in_port.odp_port, true); f->key = ofpbuf_data(&buf); f->key_len = ofpbuf_size(&buf); /* Mask. */ ofpbuf_use_stack(&buf, maskbuf, sizeof *maskbuf); odp_flow_key_from_mask(&buf, &wc.masks, &netdev_flow->flow, odp_to_u32(wc.masks.in_port.odp_port), SIZE_MAX, true); f->mask = ofpbuf_data(&buf); f->mask_len = ofpbuf_size(&buf); /* Actions. */ dp_actions = dp_netdev_flow_get_actions(netdev_flow); f->actions = dp_actions->actions; f->actions_len = dp_actions->size; /* Stats. */ get_dpif_flow_stats(netdev_flow, &f->stats); } return n_flows; } static int dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute) { struct dp_netdev *dp = get_dp_netdev(dpif); struct dpif_packet packet, *pp; struct pkt_metadata *md = &execute->md; if (ofpbuf_size(execute->packet) < ETH_HEADER_LEN || ofpbuf_size(execute->packet) > UINT16_MAX) { return EINVAL; } packet.ofpbuf = *execute->packet; pp = &packet; dp_netdev_execute_actions(dp, &pp, 1, false, md, execute->actions, execute->actions_len); /* Even though may_steal is set to false, some actions could modify or * reallocate the ofpbuf memory. We need to pass those changes to the * caller */ *execute->packet = packet.ofpbuf; 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; } /* 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); netdev_actions->actions = xmemdup(actions, size); netdev_actions->size = size; return netdev_actions; } struct dp_netdev_actions * dp_netdev_flow_get_actions(const struct dp_netdev_flow *flow) { return ovsrcu_get(struct dp_netdev_actions *, &flow->actions); } static void dp_netdev_actions_free(struct dp_netdev_actions *actions) { free(actions->actions); free(actions); } static void dp_netdev_process_rxq_port(struct dp_netdev *dp, struct dp_netdev_port *port, struct netdev_rxq *rxq) { struct dpif_packet *packets[NETDEV_MAX_RX_BATCH]; int error, cnt; error = netdev_rxq_recv(rxq, packets, &cnt); if (!error) { dp_netdev_port_input(dp, packets, cnt, port->port_no); } 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)); } } static void dpif_netdev_run(struct dpif *dpif) { struct dp_netdev_port *port; struct dp_netdev *dp = get_dp_netdev(dpif); CMAP_FOR_EACH (port, node, &dp->ports) { if (!netdev_is_pmd(port->netdev)) { int i; for (i = 0; i < netdev_n_rxq(port->netdev); i++) { dp_netdev_process_rxq_port(dp, port, port->rxq[i]); } } } } static void dpif_netdev_wait(struct dpif *dpif) { struct dp_netdev_port *port; struct dp_netdev *dp = get_dp_netdev(dpif); ovs_mutex_lock(&dp_netdev_mutex); CMAP_FOR_EACH (port, node, &dp->ports) { if (!netdev_is_pmd(port->netdev)) { int i; for (i = 0; i < netdev_n_rxq(port->netdev); i++) { netdev_rxq_wait(port->rxq[i]); } } } ovs_mutex_unlock(&dp_netdev_mutex); } struct rxq_poll { struct dp_netdev_port *port; struct netdev_rxq *rx; }; static int pmd_load_queues(struct pmd_thread *f, struct rxq_poll **ppoll_list, int poll_cnt) { struct dp_netdev *dp = f->dp; struct rxq_poll *poll_list = *ppoll_list; struct dp_netdev_port *port; int id = f->id; int index; int i; /* Simple scheduler for netdev rx polling. */ for (i = 0; i < poll_cnt; i++) { port_unref(poll_list[i].port); } poll_cnt = 0; index = 0; CMAP_FOR_EACH (port, node, &f->dp->ports) { if (netdev_is_pmd(port->netdev)) { int i; for (i = 0; i < netdev_n_rxq(port->netdev); i++) { if ((index % dp->n_pmd_threads) == id) { poll_list = xrealloc(poll_list, sizeof *poll_list * (poll_cnt + 1)); port_ref(port); poll_list[poll_cnt].port = port; poll_list[poll_cnt].rx = port->rxq[i]; poll_cnt++; } index++; } } } *ppoll_list = poll_list; return poll_cnt; } static void * pmd_thread_main(void *f_) { struct pmd_thread *f = f_; struct dp_netdev *dp = f->dp; unsigned int lc = 0; struct rxq_poll *poll_list; unsigned int port_seq; int poll_cnt; int i; poll_cnt = 0; poll_list = NULL; pmd_thread_setaffinity_cpu(f->id); reload: poll_cnt = pmd_load_queues(f, &poll_list, poll_cnt); atomic_read(&f->change_seq, &port_seq); for (;;) { unsigned int c_port_seq; int i; for (i = 0; i < poll_cnt; i++) { dp_netdev_process_rxq_port(dp, poll_list[i].port, poll_list[i].rx); } if (lc++ > 1024) { ovsrcu_quiesce(); /* TODO: need completely userspace based signaling method. * to keep this thread entirely in userspace. * For now using atomic counter. */ lc = 0; atomic_read_explicit(&f->change_seq, &c_port_seq, memory_order_consume); if (c_port_seq != port_seq) { break; } } } if (!latch_is_set(&f->dp->exit_latch)){ goto reload; } for (i = 0; i < poll_cnt; i++) { port_unref(poll_list[i].port); } free(poll_list); return NULL; } static void dp_netdev_disable_upcall(struct dp_netdev *dp) OVS_ACQUIRES(dp->upcall_rwlock) { fat_rwlock_wrlock(&dp->upcall_rwlock); } static void dpif_netdev_disable_upcall(struct dpif *dpif) OVS_NO_THREAD_SAFETY_ANALYSIS { struct dp_netdev *dp = get_dp_netdev(dpif); dp_netdev_disable_upcall(dp); } static void dp_netdev_enable_upcall(struct dp_netdev *dp) OVS_RELEASES(dp->upcall_rwlock) { fat_rwlock_unlock(&dp->upcall_rwlock); } static void dpif_netdev_enable_upcall(struct dpif *dpif) OVS_NO_THREAD_SAFETY_ANALYSIS { struct dp_netdev *dp = get_dp_netdev(dpif); dp_netdev_enable_upcall(dp); } static void dp_netdev_set_pmd_threads(struct dp_netdev *dp, int n) { int i; if (n == dp->n_pmd_threads) { return; } /* Stop existing threads. */ latch_set(&dp->exit_latch); dp_netdev_reload_pmd_threads(dp); for (i = 0; i < dp->n_pmd_threads; i++) { struct pmd_thread *f = &dp->pmd_threads[i]; xpthread_join(f->thread, NULL); } latch_poll(&dp->exit_latch); free(dp->pmd_threads); /* Start new threads. */ dp->pmd_threads = xmalloc(n * sizeof *dp->pmd_threads); dp->n_pmd_threads = n; for (i = 0; i < n; i++) { struct pmd_thread *f = &dp->pmd_threads[i]; f->dp = dp; f->id = i; atomic_store(&f->change_seq, 1); /* Each thread will distribute all devices rx-queues among * themselves. */ f->thread = ovs_thread_create("pmd", pmd_thread_main, f); } } static void * dp_netdev_flow_stats_new_cb(void) { struct dp_netdev_flow_stats *bucket = xzalloc_cacheline(sizeof *bucket); ovs_mutex_init(&bucket->mutex); return bucket; } static void dp_netdev_flow_used(struct dp_netdev_flow *netdev_flow, int cnt, int size, uint16_t tcp_flags) { long long int now = time_msec(); struct dp_netdev_flow_stats *bucket; bucket = ovsthread_stats_bucket_get(&netdev_flow->stats, dp_netdev_flow_stats_new_cb); ovs_mutex_lock(&bucket->mutex); bucket->used = MAX(now, bucket->used); bucket->packet_count += cnt; bucket->byte_count += size; bucket->tcp_flags |= tcp_flags; ovs_mutex_unlock(&bucket->mutex); } static void * dp_netdev_stats_new_cb(void) { struct dp_netdev_stats *bucket = xzalloc_cacheline(sizeof *bucket); ovs_mutex_init(&bucket->mutex); return bucket; } static void dp_netdev_count_packet(struct dp_netdev *dp, enum dp_stat_type type, int cnt) { struct dp_netdev_stats *bucket; bucket = ovsthread_stats_bucket_get(&dp->stats, dp_netdev_stats_new_cb); ovs_mutex_lock(&bucket->mutex); bucket->n[type] += cnt; ovs_mutex_unlock(&bucket->mutex); } struct packet_batch { unsigned int packet_count; unsigned int byte_count; uint16_t tcp_flags; struct dp_netdev_flow *flow; struct dpif_packet *packets[NETDEV_MAX_RX_BATCH]; struct pkt_metadata md; }; static inline void packet_batch_update(struct packet_batch *batch, struct dpif_packet *packet, const struct miniflow *mf) { batch->tcp_flags |= miniflow_get_tcp_flags(mf); batch->packets[batch->packet_count++] = packet; batch->byte_count += ofpbuf_size(&packet->ofpbuf); } static inline void packet_batch_init(struct packet_batch *batch, struct dp_netdev_flow *flow, struct pkt_metadata *md) { batch->flow = flow; batch->md = *md; batch->packet_count = 0; batch->byte_count = 0; batch->tcp_flags = 0; } static inline void packet_batch_execute(struct packet_batch *batch, struct dp_netdev *dp) { struct dp_netdev_actions *actions; struct dp_netdev_flow *flow = batch->flow; dp_netdev_flow_used(batch->flow, batch->packet_count, batch->byte_count, batch->tcp_flags); actions = dp_netdev_flow_get_actions(flow); dp_netdev_execute_actions(dp, batch->packets, batch->packet_count, true, &batch->md, actions->actions, actions->size); dp_netdev_count_packet(dp, DP_STAT_HIT, batch->packet_count); } static void dp_netdev_input(struct dp_netdev *dp, struct dpif_packet **packets, int cnt, struct pkt_metadata *md) { struct dp_netdev_queue q = DP_NETDEV_QUEUE_INITIALIZER; struct packet_batch batches[NETDEV_MAX_RX_BATCH]; struct netdev_flow_key keys[NETDEV_MAX_RX_BATCH]; const struct miniflow *mfs[NETDEV_MAX_RX_BATCH]; /* NULL at bad packets. */ struct cls_rule *rules[NETDEV_MAX_RX_BATCH]; size_t n_batches, i; for (i = 0; i < cnt; i++) { if (OVS_UNLIKELY(ofpbuf_size(&packets[i]->ofpbuf) < ETH_HEADER_LEN)) { dpif_packet_delete(packets[i]); mfs[i] = NULL; continue; } miniflow_initialize(&keys[i].flow, keys[i].buf); miniflow_extract(&packets[i]->ofpbuf, md, &keys[i].flow); mfs[i] = &keys[i].flow; } classifier_lookup_miniflow_batch(&dp->cls, mfs, rules, cnt); n_batches = 0; for (i = 0; i < cnt; i++) { struct dp_netdev_flow *flow; struct packet_batch *batch; size_t j; if (OVS_UNLIKELY(!mfs[i])) { continue; } if (OVS_UNLIKELY(!rules[i])) { struct ofpbuf *buf = &packets[i]->ofpbuf; dp_netdev_count_packet(dp, DP_STAT_MISS, 1); dp_netdev_queue_userspace_packet(&q, buf, DPIF_UC_MISS, mfs[i], NULL); dpif_packet_delete(packets[i]); continue; } /* XXX: This O(n^2) algortihm makes sense if we're operating under the * assumption that the number of distinct flows (and therefore the * number of distinct batches) is quite small. If this turns out not * to be the case, it may make sense to pre sort based on the * netdev_flow pointer. That done we can get the appropriate batching * in O(n * log(n)) instead. */ batch = NULL; flow = dp_netdev_flow_cast(rules[i]); for (j = 0; j < n_batches; j++) { if (batches[j].flow == flow) { batch = &batches[j]; break; } } if (!batch) { batch = &batches[n_batches++]; packet_batch_init(batch, flow, md); } packet_batch_update(batch, packets[i], mfs[i]); } for (i = 0; i < n_batches; i++) { packet_batch_execute(&batches[i], dp); } if (q.packet_count) { dp_netdev_execute_userspace_queue(&q, dp); } } static void dp_netdev_port_input(struct dp_netdev *dp, struct dpif_packet **packets, int cnt, odp_port_t port_no) { uint32_t *recirc_depth = recirc_depth_get(); struct pkt_metadata md = PKT_METADATA_INITIALIZER(port_no); *recirc_depth = 0; dp_netdev_input(dp, packets, cnt, &md); } static int dp_netdev_queue_userspace_packet(struct dp_netdev_queue *q, struct ofpbuf *packet, int type, const struct miniflow *key, const struct nlattr *userdata) { if (q->packet_count < NETDEV_MAX_RX_BATCH) { int cnt = q->packet_count; struct dpif_upcall *upcall = &q->upcalls[cnt]; struct ofpbuf *buf = &q->bufs[cnt]; size_t buf_size; struct flow flow; void *data; upcall->type = type; /* Allocate buffer big enough for everything. */ buf_size = ODPUTIL_FLOW_KEY_BYTES; if (userdata) { buf_size += NLA_ALIGN(userdata->nla_len); } buf_size += ofpbuf_size(packet); ofpbuf_init(buf, buf_size); /* Put ODP flow. */ miniflow_expand(key, &flow); odp_flow_key_from_flow(buf, &flow, NULL, flow.in_port.odp_port, true); upcall->key = ofpbuf_data(buf); upcall->key_len = ofpbuf_size(buf); /* Put userdata. */ if (userdata) { upcall->userdata = ofpbuf_put(buf, userdata, NLA_ALIGN(userdata->nla_len)); } /* We have to perform a copy of the packet, because we cannot send DPDK * mbufs to a non pmd thread. When the upcall processing will be done * in the pmd thread, this copy can be avoided */ data = ofpbuf_put(buf, ofpbuf_data(packet), ofpbuf_size(packet)); ofpbuf_use_stub(&upcall->packet, data, ofpbuf_size(packet)); ofpbuf_set_size(&upcall->packet, ofpbuf_size(packet)); q->packet_count++; return 0; } else { return ENOBUFS; } } static void dp_netdev_execute_userspace_queue(struct dp_netdev_queue *q, struct dp_netdev *dp) { struct dpif_upcall *upcalls = q->upcalls; struct ofpbuf *bufs = q->bufs; int cnt = q->packet_count; if (!fat_rwlock_tryrdlock(&dp->upcall_rwlock)) { ovs_assert(dp->upcall_cb); dp->upcall_cb(dp->dpif, upcalls, bufs, cnt); fat_rwlock_unlock(&dp->upcall_rwlock); } else { int i; for (i = 0; i < cnt; i++) { ofpbuf_uninit(&bufs[i]); ofpbuf_uninit(&upcalls[i].packet); } } } struct dp_netdev_execute_aux { struct dp_netdev *dp; }; static void dpif_netdev_register_upcall_cb(struct dpif *dpif, exec_upcall_cb *cb) { struct dp_netdev *dp = get_dp_netdev(dpif); dp->upcall_cb = cb; } static void dp_execute_cb(void *aux_, struct dpif_packet **packets, int cnt, struct pkt_metadata *md, 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; uint32_t *depth = recirc_depth_get(); int i; 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 (OVS_LIKELY(p)) { netdev_send(p->netdev, packets, cnt, may_steal); } else if (may_steal) { for (i = 0; i < cnt; i++) { dpif_packet_delete(packets[i]); } } break; case OVS_ACTION_ATTR_USERSPACE: { const struct nlattr *userdata; struct netdev_flow_key key; struct dp_netdev_queue q = DP_NETDEV_QUEUE_INITIALIZER; userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA); miniflow_initialize(&key.flow, key.buf); for (i = 0; i < cnt; i++) { struct ofpbuf *packet; packet = &packets[i]->ofpbuf; miniflow_extract(packet, md, &key.flow); dp_netdev_queue_userspace_packet(&q, packet, DPIF_UC_ACTION, &key.flow, userdata); if (may_steal) { dpif_packet_delete(packets[i]); } } if (q.packet_count) { dp_netdev_execute_userspace_queue(&q, aux->dp); } break; } case OVS_ACTION_ATTR_HASH: { const struct ovs_action_hash *hash_act; struct netdev_flow_key key; uint32_t hash; hash_act = nl_attr_get(a); miniflow_initialize(&key.flow, key.buf); for (i = 0; i < cnt; i++) { /* TODO: this is slow. Use RSS hash in the future */ miniflow_extract(&packets[i]->ofpbuf, md, &key.flow); if (hash_act->hash_alg == OVS_HASH_ALG_L4) { /* Hash need not be symmetric, nor does it need to include * L2 fields. */ hash = miniflow_hash_5tuple(&key.flow, hash_act->hash_basis); } else { VLOG_WARN("Unknown hash algorithm specified " "for the hash action."); hash = 2; } if (!hash) { hash = 1; /* 0 is not valid */ } if (i == 0) { md->dp_hash = hash; } packets[i]->dp_hash = hash; } break; } case OVS_ACTION_ATTR_RECIRC: if (*depth < MAX_RECIRC_DEPTH) { (*depth)++; for (i = 0; i < cnt; i++) { struct dpif_packet *recirc_pkt; struct pkt_metadata recirc_md = *md; recirc_pkt = (may_steal) ? packets[i] : dpif_packet_clone(packets[i]); recirc_md.recirc_id = nl_attr_get_u32(a); /* Hash is private to each packet */ recirc_md.dp_hash = packets[i]->dp_hash; dp_netdev_input(aux->dp, &recirc_pkt, 1, &recirc_md); } (*depth)--; break; } else { VLOG_WARN("Packet dropped. Max recirculation depth exceeded."); if (may_steal) { for (i = 0; i < cnt; i++) { dpif_packet_delete(packets[i]); } } } 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, struct dpif_packet **packets, int cnt, bool may_steal, struct pkt_metadata *md, const struct nlattr *actions, size_t actions_len) { struct dp_netdev_execute_aux aux = {dp}; odp_execute_actions(&aux, packets, cnt, may_steal, md, actions, actions_len, dp_execute_cb); } const struct dpif_class dpif_netdev_class = { "netdev", dpif_netdev_enumerate, dpif_netdev_port_open_type, dpif_netdev_open, dpif_netdev_close, dpif_netdev_destroy, dpif_netdev_run, dpif_netdev_wait, 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_create, dpif_netdev_flow_dump_destroy, dpif_netdev_flow_dump_thread_create, dpif_netdev_flow_dump_thread_destroy, dpif_netdev_flow_dump_next, dpif_netdev_execute, NULL, /* operate */ NULL, /* recv_set */ NULL, /* handlers_set */ dpif_netdev_queue_to_priority, NULL, /* recv */ NULL, /* recv_wait */ NULL, /* recv_purge */ dpif_netdev_register_upcall_cb, dpif_netdev_enable_upcall, dpif_netdev_disable_upcall, }; 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 *old_port; struct dp_netdev_port *new_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_mutex_lock(&dp->port_mutex); if (get_port_by_name(dp, argv[2], &old_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; } /* Remove old port. */ cmap_remove(&dp->ports, &old_port->node, hash_port_no(old_port->port_no)); ovsrcu_postpone(free, old_port); /* Insert new port (cmap semantics mean we cannot re-insert 'old_port'). */ new_port = xmemdup(old_port, sizeof *old_port); new_port->port_no = port_no; cmap_insert(&dp->ports, &new_port->node, hash_port_no(port_no)); seq_change(dp->port_seq); unixctl_command_reply(conn, NULL); exit: ovs_mutex_unlock(&dp->port_mutex); dp_netdev_unref(dp); } static void dpif_dummy_delete_port(struct unixctl_conn *conn, int argc OVS_UNUSED, const char *argv[], void *aux OVS_UNUSED) { struct dp_netdev_port *port; struct dp_netdev *dp; 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_mutex_lock(&dp->port_mutex); if (get_port_by_name(dp, argv[2], &port)) { unixctl_command_reply_error(conn, "unknown port"); } else if (port->port_no == ODPP_LOCAL) { unixctl_command_reply_error(conn, "can't delete local port"); } else { do_del_port(dp, port); unixctl_command_reply(conn, NULL); } ovs_mutex_unlock(&dp->port_mutex); 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); unixctl_command_register("dpif-dummy/delete-port", "DP PORT", 2, 2, dpif_dummy_delete_port, NULL); }