This patch consumes the CT_Zone and CT_Timeout_Policy tables, maintains the zone-based configuration in the vswitchd. Whenever there is a database change, vswitchd will read the datapath, CT_Zone, and CT_Timeout_Policy tables from ovsdb, builds an internal snapshot of the database configuration in bridge.c, and pushes down the change into ofproto and dpif layer.
If a new zone-based timeout policy is added, it updates the zone to timeout policy mapping in the per datapath type datapath structure in dpif-backer, and pushes down the timeout policy into the datapath via dpif interface. If a timeout policy is no longer used, for kernel datapath, vswitchd may not be able to remove it from datapath immediately since datapath flows can still reference the to-be-deleted timeout policies. Thus, we keep an timeout policy kill list, that vswitchd will go back to the list periodically and try to kill the unused timeout policies. Signed-off-by: Yi-Hung Wei <[email protected]> --- ofproto/ofproto-dpif.c | 287 +++++++++++++++++++++++++++++++++++++++++++++ ofproto/ofproto-dpif.h | 10 ++ ofproto/ofproto-provider.h | 10 ++ ofproto/ofproto.c | 26 ++++ ofproto/ofproto.h | 5 + vswitchd/bridge.c | 198 +++++++++++++++++++++++++++++++ 6 files changed, 536 insertions(+) diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c index 751535249e21..244155a59291 100644 --- a/ofproto/ofproto-dpif.c +++ b/ofproto/ofproto-dpif.c @@ -156,6 +156,25 @@ struct ofport_dpif { size_t n_qdscp; }; +struct ct_timeout_policy { + int ref_count; /* The number of ct zones that use this + * timeout policy. */ + uint32_t tp_id; /* Timeout policy id in the datapath. */ + struct simap tp; /* A map from timeout policy attribute to + * timeout value. */ + struct hmap_node node; /* Element in struct dpif_backer's "ct_tps" + * cmap. */ + struct ovs_list list_node; /* Element in struct dpif_backer's + * "ct_tp_kill_list" list. */ +}; + +struct ct_zone { + uint16_t zone_id; + struct ct_timeout_policy *ct_tp; + struct cmap_node node; /* Element in struct dpif_backer's + * "ct_zones" cmap. */ +}; + static odp_port_t ofp_port_to_odp_port(const struct ofproto_dpif *, ofp_port_t); @@ -196,6 +215,9 @@ static struct hmap all_ofproto_dpifs_by_uuid = static bool ofproto_use_tnl_push_pop = true; static void ofproto_unixctl_init(void); +static void ct_zone_config_init(struct dpif_backer *backer); +static void ct_zone_config_uninit(struct dpif_backer *backer); +static void ct_zone_timeout_policy_sweep(struct dpif_backer *backer); static inline struct ofproto_dpif * ofproto_dpif_cast(const struct ofproto *ofproto) @@ -488,6 +510,7 @@ type_run(const char *type) } process_dpif_port_changes(backer); + ct_zone_timeout_policy_sweep(backer); return 0; } @@ -683,6 +706,7 @@ close_dpif_backer(struct dpif_backer *backer, bool del) } dpif_close(backer->dpif); id_pool_destroy(backer->meter_ids); + ct_zone_config_uninit(backer); free(backer); } @@ -811,6 +835,8 @@ open_dpif_backer(const char *type, struct dpif_backer **backerp) backer->meter_ids = NULL; } + ct_zone_config_init(backer); + /* Make a pristine snapshot of 'support' into 'boottime_support'. * 'boottime_support' can be checked to prevent 'support' to be changed * beyond the datapath capabilities. In case 'support' is changed by @@ -5086,6 +5112,265 @@ ct_flush(const struct ofproto *ofproto_, const uint16_t *zone) ct_dpif_flush(ofproto->backer->dpif, zone, NULL); } +static struct ct_timeout_policy * +ct_timeout_policy_lookup(const struct hmap *ct_tps, struct simap *tp) +{ + struct ct_timeout_policy *ct_tp; + + HMAP_FOR_EACH_WITH_HASH (ct_tp, node, simap_hash(tp), ct_tps) { + if (simap_equal(&ct_tp->tp, tp)) { + return ct_tp; + } + } + return NULL; +} + +static struct ct_timeout_policy * +ct_timeout_policy_alloc__(void) +{ + struct ct_timeout_policy *ct_tp = xzalloc(sizeof *ct_tp); + simap_init(&ct_tp->tp); + return ct_tp; +} + +static struct ct_timeout_policy * +ct_timeout_policy_alloc(struct simap *tp, struct id_pool *tp_ids) +{ + struct simap_node *node; + + struct ct_timeout_policy *ct_tp = ct_timeout_policy_alloc__(); + SIMAP_FOR_EACH (node, tp) { + simap_put(&ct_tp->tp, node->name, node->data); + } + + if (!id_pool_alloc_id(tp_ids, &ct_tp->tp_id)) { + VLOG_ERR_RL(&rl, "failed to allocate timeout policy id."); + simap_destroy(&ct_tp->tp); + free(ct_tp); + return NULL; + } + + return ct_tp; +} + +static void +ct_timeout_policy_destroy(struct ct_timeout_policy *ct_tp, + struct id_pool *tp_ids) +{ + id_pool_free_id(tp_ids, ct_tp->tp_id); + simap_destroy(&ct_tp->tp); + ovsrcu_postpone(free, ct_tp); +} + +static void +ct_timeout_policy_unref(struct dpif_backer *backer, + struct ct_timeout_policy *ct_tp) +{ + if (ct_tp) { + ct_tp->ref_count--; + + if (!ct_tp->ref_count) { + hmap_remove(&backer->ct_tps, &ct_tp->node); + ovs_list_push_back(&backer->ct_tp_kill_list, &ct_tp->list_node); + } + } +} + +static struct ct_zone * +ct_zone_lookup(const struct cmap *ct_zones, uint16_t zone) +{ + struct ct_zone *ct_zone; + + CMAP_FOR_EACH_WITH_HASH (ct_zone, node, hash_int(zone, 0), ct_zones) { + if (ct_zone->zone_id == zone) { + return ct_zone; + } + } + return NULL; +} + +static struct ct_zone * +ct_zone_alloc(uint16_t zone) +{ + struct ct_zone *ct_zone = xzalloc(sizeof *ct_zone); + ct_zone->zone_id = zone; + return ct_zone; +} + +static void +ct_zone_destroy(struct ct_zone *ct_zone) +{ + ovsrcu_postpone(free, ct_zone); +} + +static void +ct_zone_remove_and_destroy(struct dpif_backer *backer, struct ct_zone *ct_zone) +{ + cmap_remove(&backer->ct_zones, &ct_zone->node, + hash_int(ct_zone->zone_id, 0)); + ct_zone_destroy(ct_zone); +} + +static void +ct_add_timeout_policy_to_dpif(struct dpif *dpif, + struct ct_timeout_policy *ct_tp) +{ + struct ct_dpif_timeout_policy cdtp; + struct simap_node *node; + + cdtp.id = ct_tp->tp_id; + SIMAP_FOR_EACH (node, &ct_tp->tp) { + ct_dpif_set_timeout_policy_attr_by_name(&cdtp, node->name, node->data); + } + + int err = ct_dpif_set_timeout_policy(dpif, &cdtp); + if (err) { + VLOG_ERR_RL(&rl, "failed to set timeout policy %"PRIu32" (%s)", + ct_tp->tp_id, ovs_strerror(err)); + } +} + +static void +clear_existing_ct_timeout_policies(struct dpif_backer *backer) +{ + /* In kernel datapath, when OVS starts, there may be some pre-existing + * timeout policies in the kernel. To avoid reassign the same timeout + * policy ids, we dump all the pre-existing timeout policies and keep + * the ids in the pool. Since OVS will not use those timeout policies + * for new datapath flow, we add them to the kill list and remove + * them later on. */ + struct ct_dpif_timeout_policy cdtp; + void *state; + + if (ct_dpif_timeout_policy_dump_start(backer->dpif, &state)) { + return; + } + + while (!ct_dpif_timeout_policy_dump_next(backer->dpif, state, &cdtp)) { + struct ct_timeout_policy *ct_tp = ct_timeout_policy_alloc__(); + ct_tp->tp_id = cdtp.id; + id_pool_add(backer->tp_ids, cdtp.id); + ovs_list_push_back(&backer->ct_tp_kill_list, &ct_tp->list_node); + } + + ct_dpif_timeout_policy_dump_done(backer->dpif, state); +} + +#define MAX_TIMEOUT_POLICY_ID UINT32_MAX + +static void +ct_zone_config_init(struct dpif_backer *backer) +{ + cmap_init(&backer->ct_zones); + hmap_init(&backer->ct_tps); + backer->tp_ids = id_pool_create(0, MAX_TIMEOUT_POLICY_ID); + ovs_list_init(&backer->ct_tp_kill_list); + clear_existing_ct_timeout_policies(backer); +} + +static void +ct_zone_config_uninit(struct dpif_backer *backer) +{ + struct ct_timeout_policy *ct_tp; + struct ct_zone *ct_zone; + + CMAP_FOR_EACH (ct_zone, node, &backer->ct_zones) { + ct_zone_remove_and_destroy(backer, ct_zone); + } + + HMAP_FOR_EACH_POP (ct_tp, node, &backer->ct_tps) { + ct_timeout_policy_destroy(ct_tp, backer->tp_ids); + } + + LIST_FOR_EACH_POP (ct_tp, list_node, &backer->ct_tp_kill_list) { + ct_timeout_policy_destroy(ct_tp, backer->tp_ids); + } + + cmap_destroy(&backer->ct_zones); + hmap_destroy(&backer->ct_tps); + id_pool_destroy(backer->tp_ids); +} + +static void +ct_zone_timeout_policy_sweep(struct dpif_backer *backer) +{ + if (!ovs_list_is_empty(&backer->ct_tp_kill_list)) { + struct ct_timeout_policy *ct_tp, *next; + + LIST_FOR_EACH_SAFE (ct_tp, next, list_node, &backer->ct_tp_kill_list) { + int err = ct_dpif_del_timeout_policy(backer->dpif, ct_tp->tp_id); + if (!err) { + ovs_list_remove(&ct_tp->list_node); + ct_timeout_policy_destroy(ct_tp, backer->tp_ids); + } else { + VLOG_INFO_RL(&rl, "failed to delete timeout policy id = " + "%"PRIu32" %s", ct_tp->tp_id, ovs_strerror(err)); + } + } + } +} + +static void +ct_set_zone_timeout_policy(const char *datapath_type, uint16_t zone, + struct simap *timeout_policy) +{ + struct dpif_backer *backer = shash_find_data(&all_dpif_backers, + datapath_type); + if (!backer) { + return; + } + + struct ct_timeout_policy *ct_tp = ct_timeout_policy_lookup(&backer->ct_tps, + timeout_policy); + if (!ct_tp) { + ct_tp = ct_timeout_policy_alloc(timeout_policy, backer->tp_ids); + if (ct_tp) { + hmap_insert(&backer->ct_tps, &ct_tp->node, simap_hash(&ct_tp->tp)); + ct_add_timeout_policy_to_dpif(backer->dpif, ct_tp); + } else { + VLOG_ERR_RL(&rl, "failed to allocate timeout policy"); + return; + } + } + + struct ct_zone *ct_zone = ct_zone_lookup(&backer->ct_zones, zone); + if (ct_zone) { + if (ct_zone->ct_tp != ct_tp) { + /* Add the new zone timeout pollicy. */ + struct ct_zone *new_ct_zone = ct_zone_alloc(zone); + new_ct_zone->ct_tp = ct_tp; + ct_tp->ref_count++; + cmap_replace(&backer->ct_zones, &ct_zone->node, &new_ct_zone->node, + hash_int(zone, 0)); + + /* Deletes the old zone timeout policy. */ + ct_timeout_policy_unref(backer, ct_zone->ct_tp); + ct_zone_destroy(ct_zone); + } + } else { + struct ct_zone *new_ct_zone = ct_zone_alloc(zone); + new_ct_zone->ct_tp = ct_tp; + cmap_insert(&backer->ct_zones, &new_ct_zone->node, hash_int(zone, 0)); + ct_tp->ref_count++; + } +} + +static void +ct_del_zone_timeout_policy(const char *datapath_type, uint16_t zone) +{ + struct dpif_backer *backer = shash_find_data(&all_dpif_backers, + datapath_type); + if (!backer) { + return; + } + + struct ct_zone *ct_zone = ct_zone_lookup(&backer->ct_zones, zone); + if (ct_zone) { + ct_timeout_policy_unref(backer, ct_zone->ct_tp); + ct_zone_remove_and_destroy(backer, ct_zone); + } +} + static bool set_frag_handling(struct ofproto *ofproto_, enum ofputil_frag_handling frag_handling) @@ -6189,4 +6474,6 @@ const struct ofproto_class ofproto_dpif_class = { get_datapath_version, /* get_datapath_version */ type_set_config, ct_flush, /* ct_flush */ + ct_set_zone_timeout_policy, + ct_del_zone_timeout_policy, }; diff --git a/ofproto/ofproto-dpif.h b/ofproto/ofproto-dpif.h index cd5321eb942c..0dd7a45fe550 100644 --- a/ofproto/ofproto-dpif.h +++ b/ofproto/ofproto-dpif.h @@ -245,6 +245,16 @@ struct dpif_backer { /* Meter. */ struct id_pool *meter_ids; /* Datapath meter allocation. */ + /* Connection tracking. */ + struct id_pool *tp_ids; /* Datapath timeout policy id + * allocation. */ + struct cmap ct_zones; /* "struct ct_zone"s indexed by zone + * id. */ + struct hmap ct_tps; /* "struct ct_timeout_policy"s indexed + * by timeout policy (struct simap). */ + struct ovs_list ct_tp_kill_list; /* A list of timeout policy to be + * deleted. */ + /* Version string of the datapath stored in OVSDB. */ char *dp_version_string; diff --git a/ofproto/ofproto-provider.h b/ofproto/ofproto-provider.h index 7907d4bfb416..54da71737b96 100644 --- a/ofproto/ofproto-provider.h +++ b/ofproto/ofproto-provider.h @@ -58,6 +58,7 @@ #include "tun-metadata.h" #include "versions.h" #include "vl-mff-map.h" +#include "vswitch-idl.h" struct match; struct ofputil_flow_mod; @@ -1872,6 +1873,15 @@ struct ofproto_class { /* Flushes the connection tracking tables. If 'zone' is not NULL, * only deletes connections in '*zone'. */ void (*ct_flush)(const struct ofproto *, const uint16_t *zone); + + /* Sets conntrack timeout policy specified by 'timeout_policy' to 'zone' + * in datapath type 'dp_type'. */ + void (*ct_set_zone_timeout_policy)(const char *dp_type, uint16_t zone, + struct simap *timeout_policy); + + /* Deletes the timeout policy associated with 'zone' in datapath type + * 'dp_type'. */ + void (*ct_del_zone_timeout_policy)(const char *dp_type, uint16_t zone); }; extern const struct ofproto_class ofproto_dpif_class; diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c index 1d6fc00696f8..a20066a147c3 100644 --- a/ofproto/ofproto.c +++ b/ofproto/ofproto.c @@ -935,6 +935,32 @@ ofproto_get_flow_restore_wait(void) return flow_restore_wait; } +/* Connection tracking configuration. */ +void +ofproto_ct_set_zone_timeout_policy(const char *datapath_type, uint16_t zone, + struct simap *timeout_policy) +{ + datapath_type = ofproto_normalize_type(datapath_type); + const struct ofproto_class *class = ofproto_class_find__(datapath_type); + + if (class->ct_set_zone_timeout_policy) { + class->ct_set_zone_timeout_policy(datapath_type, zone, + timeout_policy); + } +} + +void +ofproto_ct_del_zone_timeout_policy(const char *datapath_type, uint16_t zone) +{ + datapath_type = ofproto_normalize_type(datapath_type); + const struct ofproto_class *class = ofproto_class_find__(datapath_type); + + if (class->ct_del_zone_timeout_policy) { + class->ct_del_zone_timeout_policy(datapath_type, zone); + } + +} + /* Spanning Tree Protocol (STP) configuration. */ diff --git a/ofproto/ofproto.h b/ofproto/ofproto.h index 6e4afffa17e0..acd8bdef78df 100644 --- a/ofproto/ofproto.h +++ b/ofproto/ofproto.h @@ -362,6 +362,11 @@ int ofproto_get_stp_status(struct ofproto *, struct ofproto_stp_status *); int ofproto_set_rstp(struct ofproto *, const struct ofproto_rstp_settings *); int ofproto_get_rstp_status(struct ofproto *, struct ofproto_rstp_status *); void ofproto_set_vlan_limit(int vlan_limit); +void ofproto_ct_set_zone_timeout_policy(const char *datapath_type, + uint16_t zone, + struct simap *timeout_policy); +void ofproto_ct_del_zone_timeout_policy(const char *datapath_type, + uint16_t zone); /* Configuration of ports. */ void ofproto_port_unregister(struct ofproto *, ofp_port_t ofp_port); diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c index 2976771aeaba..72c92974fc18 100644 --- a/vswitchd/bridge.c +++ b/vswitchd/bridge.c @@ -153,9 +153,35 @@ struct aa_mapping { char *br_name; }; +/* Internal representation of conntrack zone configuration table in OVSDB. */ +struct ct_zone { + uint16_t zone; + struct simap tp; /* A map from timeout policy attribute to + * timeout value. */ + unsigned int last_used; /* The last idl_seqno that this struct is used + * in OVSDB. This number is used for garbage + * collection. */ + struct hmap_node node; /* Element in struct datapath_cfgs's + * "ct_zone_timeout_policies" hmap. */ +}; + +/* Internal representation of datapath configuration table in OVSDB. */ +struct datapath { + char *type; /* Datapath type. */ + struct hmap ct_zones; /* "struct ct_zone"s indexed by zone id. */ + struct hmap_node node; /* In 'all_datapath_cfgs'. */ + const struct ovsrec_datapath *dp_cfg; + unsigned int last_used; /* The last idl_seqno that this struct is used + * in OVSDB. This number is used for garbage + * collection. */ +}; + /* All bridges, indexed by name. */ static struct hmap all_bridges = HMAP_INITIALIZER(&all_bridges); +/* All datapath configuartions, indexed by type. */ +static struct hmap all_datapaths = HMAP_INITIALIZER(&all_datapaths); + /* OVSDB IDL used to obtain configuration. */ static struct ovsdb_idl *idl; @@ -588,6 +614,177 @@ config_ofproto_types(const struct smap *other_config) } static void +get_timeout_policy_from_ovsrec(struct simap *tp, + const struct ovsrec_ct_timeout_policy *tp_cfg) +{ + for (size_t i = 0; i < tp_cfg->n_timeouts; i++) { + simap_put(tp, tp_cfg->key_timeouts[i], tp_cfg->value_timeouts[i]); + } +} + +static struct ct_zone * +ct_zone_lookup(struct hmap *ct_zones, uint16_t zone) +{ + struct ct_zone *ct_zone; + + HMAP_FOR_EACH_WITH_HASH (ct_zone, node, hash_int(zone, 0), ct_zones) { + if (ct_zone->zone == zone) { + return ct_zone; + } + } + return NULL; +} + +static struct ct_zone * +ct_zone_alloc(uint16_t zone, struct ovsrec_ct_timeout_policy *tp_cfg) +{ + struct ct_zone *ct_zone = xzalloc(sizeof *ct_zone); + + ct_zone->zone = zone; + simap_init(&ct_zone->tp); + get_timeout_policy_from_ovsrec(&ct_zone->tp, tp_cfg); + return ct_zone; +} + +static void +ct_zone_remove_and_destroy(struct datapath *dp, struct ct_zone *ct_zone) +{ + hmap_remove(&dp->ct_zones, &ct_zone->node); + simap_destroy(&ct_zone->tp); + free(ct_zone); +} + +/* Replace 'old_tp' by 'new_tp' (destroyed 'new_tp'). Returns true if 'old_tp' + * and 'new_tp' contains different data, false if they are the same. */ +static bool +update_timeout_policy(struct simap *old_tp, struct simap *new_tp) +{ + bool changed = !simap_equal(old_tp, new_tp); + simap_swap(old_tp, new_tp); + simap_destroy(new_tp); + return changed; +} + +static struct datapath * +datapath_lookup(const char *type) +{ + struct datapath *dp; + + HMAP_FOR_EACH_WITH_HASH (dp, node, hash_string(type, 0), &all_datapaths) { + if (!strcmp(dp->type, type)) { + return dp; + } + } + return NULL; +} + +static struct datapath * +datapath_create(const struct ovsrec_datapath *dp_cfg, const char *type) +{ + struct datapath *dp = xzalloc(sizeof *dp); + dp->type = xstrdup(type); + dp->dp_cfg = dp_cfg; + + hmap_init(&dp->ct_zones); + hmap_insert(&all_datapaths, &dp->node, hash_string(type, 0)); + return dp; +} + +static void +datapath_destroy(struct datapath *dp) +{ + struct ct_zone *ct_zone, *next; + + if (dp) { + HMAP_FOR_EACH_SAFE (ct_zone, next, node, &dp->ct_zones) { + ofproto_ct_del_zone_timeout_policy(dp->type, ct_zone->zone); + ct_zone_remove_and_destroy(dp, ct_zone); + } + + hmap_remove(&all_datapaths, &dp->node); + hmap_destroy(&dp->ct_zones); + free(dp->type); + free(dp); + } +} + +static void +update_datapath_cfgs(const struct ovsrec_open_vswitch *cfg) +{ + struct datapath *dp, *next; + size_t i; + + /* Add new datapath configs. */ + for (i = 0; i < cfg->n_datapaths; i++) { + const struct ovsrec_datapath *dp_cfg = cfg->value_datapaths[i]; + char *dp_name = cfg->key_datapaths[i]; + + dp = datapath_lookup(dp_name); + if (!dp) { + dp = datapath_create(dp_cfg, dp_name); + } + dp->last_used = idl_seqno; + } + + /* Get rid of deleted datapath configs. */ + HMAP_FOR_EACH_SAFE (dp, next, node, &all_datapaths) { + if (dp->last_used != idl_seqno) { + datapath_destroy(dp); + } + } +} + +static void +reconfigure_ct_zones(struct datapath *dp) +{ + const struct ovsrec_datapath *dp_cfg = dp->dp_cfg; + struct ct_zone *ct_zone, *next; + + /* Loop through all zones. Add or update configs. */ + for (size_t i = 0; i < dp_cfg->n_ct_zones; i++) { + uint16_t zone = dp_cfg->key_ct_zones[i]; + struct ovsrec_ct_zone *zone_cfg = dp_cfg->value_ct_zones[i]; + struct ovsrec_ct_timeout_policy *tp_cfg = zone_cfg->timeout_policy; + + ct_zone = ct_zone_lookup(&dp->ct_zones, zone); + if (ct_zone) { + struct simap new_tp = SIMAP_INITIALIZER(&new_tp); + get_timeout_policy_from_ovsrec(&new_tp, tp_cfg); + if (update_timeout_policy(&ct_zone->tp, &new_tp)) { + ofproto_ct_set_zone_timeout_policy(dp->type, ct_zone->zone, + &ct_zone->tp); + } + } else { + ct_zone = ct_zone_alloc(zone, tp_cfg); + hmap_insert(&dp->ct_zones, &ct_zone->node, hash_int(zone, 0)); + ofproto_ct_set_zone_timeout_policy(dp->type, ct_zone->zone, + &ct_zone->tp); + } + ct_zone->last_used = idl_seqno; + } + + /* Remove unused ct_zone configs. */ + HMAP_FOR_EACH_SAFE (ct_zone, next, node, &dp->ct_zones) { + if (ct_zone->last_used != idl_seqno) { + ofproto_ct_del_zone_timeout_policy(dp->type, ct_zone->zone); + ct_zone_remove_and_destroy(dp, ct_zone); + } + } +} + +static void +reconfigure_datapath_cfgs(const struct ovsrec_open_vswitch *cfg) +{ + struct datapath *dp; + + update_datapath_cfgs(cfg); + + HMAP_FOR_EACH (dp, node, &all_datapaths) { + reconfigure_ct_zones(dp); + } +} + +static void bridge_reconfigure(const struct ovsrec_open_vswitch *ovs_cfg) { struct sockaddr_in *managers; @@ -669,6 +866,7 @@ bridge_reconfigure(const struct ovsrec_open_vswitch *ovs_cfg) } reconfigure_system_stats(ovs_cfg); + reconfigure_datapath_cfgs(ovs_cfg); /* Complete the configuration. */ sflow_bridge_number = 0; -- 2.7.4 _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
