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[98.28.205.172]) by smtp.gmail.com with ESMTPSA id q12sm6920277qtl.13.2021.05.22.11.12.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 22 May 2021 11:12:17 -0700 (PDT) From: Vasu Dasari To: dev@openvswitch.org Date: Sat, 22 May 2021 14:12:11 -0400 Message-Id: <20210522181211.48976-1-vdasari@gmail.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Subject: [ovs-dev] [PATCH v4] ofproto-dpif: APIs and CLI option to add/delete static fdb entry X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Currently there is an option to add/flush/show ARP/ND neighbor. This covers L3 side. For L2 side, there is only fdb show command. This patch gives an option to add/del an fdb entry via ovs-appctl. CLI command looks like: To add: ovs-appctl fdb/add ovs-appctl fdb/add br0 p1 0 50:54:00:00:00:05 To del: ovs-appctl fdb/del ovs-appctl fdb/del br0 p1 0 50:54:00:00:00:05 Added two new APIs to provide convenient interface to add and delete static-macs. void xlate_add_static_mac_entry(const struct ofproto_dpif *, ofp_port_t in_port, struct eth_addr dl_src, int vlan); void xlate_delete_static_mac_entry(const struct ofproto_dpif *, struct eth_addr dl_src, int vlan); 1. Static entry should not age. To indicate that entry being programmed is a static entry, 'expires' field in 'struct mac_entry' will be set to a MAC_ENTRY_AGE_STATIC_ENTRY. A check for this value is made while deleting mac entry as part of regular aging process. 2. Another change to of mac-update logic, when a packet with same dl_src as that of a static-mac entry arrives on any port, the logic will not modify the expires field. 3. While flushing fdb entries, made sure static ones are not evicted. Added following tests: ofproto-dpif - static-mac add/del/flush ofproto-dpif - static-mac mac moves Signed-off-by: Vasu Dasari Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2019-June/048894.html Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=1597752 Tested-by: Eelco Chaudron --- v1: - Fixed 0-day robot warnings v2: - Fix valgrind error in the modified code in mac_learning_insert() where a read is is performed on e->expires which is not initialized v3: - Addressed code review comments - Added more documentation - Fixed mac_entry_age() and is_mac_learning_update_needed() to have common understanding of return values when mac_entry is a static one. - Added NEWS item v4: - Addressed code review comments - Static entries will not be purged when fdb/flush is performed. - Static entries will not be overwritten when packet with same dl_src arrives on any port of switch - Provided bit more detail while doing fdb/add, to indicate if static-mac is overriding already present entry - Separated test cases for a bit more clarity --- NEWS | 2 + lib/mac-learning.c | 61 +++++++++++++++++++++---- lib/mac-learning.h | 11 +++++ ofproto/ofproto-dpif-xlate.c | 28 ++++++++++++ ofproto/ofproto-dpif-xlate.h | 5 ++ ofproto/ofproto-dpif.c | 88 ++++++++++++++++++++++++++++++++++-- tests/ofproto-dpif.at | 84 ++++++++++++++++++++++++++++++++++ 7 files changed, 266 insertions(+), 13 deletions(-) diff --git a/NEWS b/NEWS index 402ce5969..61ab61462 100644 --- a/NEWS +++ b/NEWS @@ -5,6 +5,8 @@ Post-v2.15.0 - Userspace datapath: * Auto load balancing of PMDs now partially supports cross-NUMA polling cases, e.g if all PMD threads are running on the same NUMA node. + * Added ability to add and delete static mac entries using: + 'ovs-appctl fdb/{add,del} ' - ovs-ctl: * New option '--no-record-hostname' to disable hostname configuration in ovsdb on startup. diff --git a/lib/mac-learning.c b/lib/mac-learning.c index 3d5293d3b..ab58e2ab6 100644 --- a/lib/mac-learning.c +++ b/lib/mac-learning.c @@ -35,12 +35,23 @@ COVERAGE_DEFINE(mac_learning_expired); COVERAGE_DEFINE(mac_learning_evicted); COVERAGE_DEFINE(mac_learning_moved); -/* Returns the number of seconds since 'e' (within 'ml') was last learned. */ +/* + * This function will return age of mac entry in the fdb. It + * will return either one of the following: + * 1. Number of seconds since 'e' (within 'ml') was last learned. + * 2. If the mac entry is a static entry, it returns + * MAC_ENTRY_AGE_STATIC_ENTRY + */ int mac_entry_age(const struct mac_learning *ml, const struct mac_entry *e) { - time_t remaining = e->expires - time_now(); - return ml->idle_time - remaining; + /* For static fdb entries, expires would be MAC_ENTRY_AGE_STATIC_ENTRY */ + if (MAC_ENTRY_AGE_STATIC_ENTRY == e->expires) { + return e->expires; + } else { + time_t remaining = e->expires - time_now(); + return ml->idle_time - remaining; + } } static uint32_t @@ -282,6 +293,18 @@ mac_learning_set_idle_time(struct mac_learning *ml, unsigned int idle_time) } } +/* Changes the MAC aging timeout of a mac_entry to 'idle_time' seconds. */ +void +mac_entry_set_idle_time(struct mac_learning *ml, struct eth_addr mac, + int vlan, unsigned int idle_time) +{ + struct mac_entry *e; + e = mac_entry_lookup(ml, mac, vlan); + if (e) { + e->expires = idle_time; + } +} + /* Sets the maximum number of entries in 'ml' to 'max_entries', adjusting it * to be within a reasonable range. */ void @@ -336,6 +359,7 @@ mac_learning_insert(struct mac_learning *ml, e->vlan = vlan; e->grat_arp_lock = TIME_MIN; e->mlport = NULL; + e->expires = 0; COVERAGE_INC(mac_learning_learned); ml->total_learned++; } else { @@ -348,7 +372,10 @@ mac_learning_insert(struct mac_learning *ml, ovs_list_remove(&e->port_lru_node); ovs_list_push_back(&e->mlport->port_lrus, &e->port_lru_node); } - e->expires = time_now() + ml->idle_time; + /* Do not update 'expires' for static mac entry */ + if (e->expires != MAC_ENTRY_AGE_STATIC_ENTRY) { + e->expires = time_now() + ml->idle_time; + } return e; } @@ -378,10 +405,16 @@ is_mac_learning_update_needed(const struct mac_learning *ml, } mac = mac_learning_lookup(ml, src, vlan); - if (!mac || mac_entry_age(ml, mac)) { + /* If mac entry is missing it needs to be added to fdb */ + if (!mac) { return true; } + /* if mac is a static entry, then there is no need to update */ + if (mac_entry_age(ml, mac) == MAC_ENTRY_AGE_STATIC_ENTRY) { + return false; + } + if (is_gratuitous_arp) { /* We don't want to learn from gratuitous ARP packets that are * reflected back over bond members so we lock the learning table. For @@ -513,13 +546,23 @@ mac_learning_expire(struct mac_learning *ml, struct mac_entry *e) free(e); } -/* Expires all the mac-learning entries in 'ml'. */ +/* Expires all the dynamic mac-learning entries in 'ml'. */ void mac_learning_flush(struct mac_learning *ml) { - struct mac_entry *e; - while (get_lru(ml, &e)){ - mac_learning_expire(ml, e); + struct mac_entry *e, *first_static_mac = NULL; + + while (get_lru(ml, &e) && (e != first_static_mac)) { + /* static-mac should not be evicted */ + if (MAC_ENTRY_AGE_STATIC_ENTRY == e->expires) { + /* Make note of first static-mac encountered, so that this while + * loop will break on visting this mac again via get_lru() */ + if (!first_static_mac) { + first_static_mac = e; + } + } else { + mac_learning_expire(ml, e); + } } hmap_shrink(&ml->table); } diff --git a/lib/mac-learning.h b/lib/mac-learning.h index 0ddab06cb..d8ff3172b 100644 --- a/lib/mac-learning.h +++ b/lib/mac-learning.h @@ -57,6 +57,11 @@ * list starting from the LRU end, deleting each entry that has been idle too * long. * + * Fourth, a mac entry can be configured statically via API or appctl commands. + * Static entries are programmed to have a age of MAC_ENTRY_AGE_STATIC_ENTRY. + * Age of static entries will not be updated by a receiving packet as part of + * regular packet processing. + * * Finally, the number of MAC learning table entries has a configurable maximum * size to prevent memory exhaustion. When a new entry must be inserted but * the table is already full, the implementation uses an eviction strategy @@ -94,6 +99,9 @@ struct mac_learning; /* Time, in seconds, before expiring a mac_entry due to inactivity. */ #define MAC_ENTRY_DEFAULT_IDLE_TIME 300 +/* Age value to represent a static entry */ +#define MAC_ENTRY_AGE_STATIC_ENTRY INT_MAX + /* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid * relearning based on a reflection from a bond member. */ #define MAC_GRAT_ARP_LOCK_TIME 5 @@ -202,6 +210,9 @@ bool mac_learning_set_flood_vlans(struct mac_learning *ml, void mac_learning_set_idle_time(struct mac_learning *ml, unsigned int idle_time) OVS_REQ_WRLOCK(ml->rwlock); +void mac_entry_set_idle_time(struct mac_learning *ml, struct eth_addr src, + int vlan, unsigned int idle_time) + OVS_REQ_WRLOCK(ml->rwlock); void mac_learning_set_max_entries(struct mac_learning *ml, size_t max_entries) OVS_REQ_WRLOCK(ml->rwlock); diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c index 7108c8a30..4392a38f4 100644 --- a/ofproto/ofproto-dpif-xlate.c +++ b/ofproto/ofproto-dpif-xlate.c @@ -8011,6 +8011,34 @@ xlate_mac_learning_update(const struct ofproto_dpif *ofproto, update_learning_table__(xbridge, xbundle, dl_src, vlan, is_grat_arp); } +void +xlate_add_static_mac_entry(const struct ofproto_dpif *ofproto, + ofp_port_t in_port, + struct eth_addr dl_src, int vlan) +{ + xlate_delete_static_mac_entry(ofproto, dl_src, vlan); + + xlate_mac_learning_update(ofproto, in_port, dl_src, vlan, false); + + ovs_rwlock_wrlock(&ofproto->ml->rwlock); + mac_entry_set_idle_time(ofproto->ml, dl_src, vlan, INT_MAX); + ovs_rwlock_unlock(&ofproto->ml->rwlock); +} + +void +xlate_delete_static_mac_entry(const struct ofproto_dpif *ofproto, + struct eth_addr dl_src, int vlan) +{ + struct mac_entry *e = NULL; + + ovs_rwlock_wrlock(&ofproto->ml->rwlock); + e = mac_learning_lookup(ofproto->ml, dl_src, vlan); + if (e) { + mac_learning_expire(ofproto->ml, e); + } + ovs_rwlock_unlock(&ofproto->ml->rwlock); +} + void xlate_set_support(const struct ofproto_dpif *ofproto, const struct dpif_backer_support *support) diff --git a/ofproto/ofproto-dpif-xlate.h b/ofproto/ofproto-dpif-xlate.h index 3426a27b2..9e6e95756 100644 --- a/ofproto/ofproto-dpif-xlate.h +++ b/ofproto/ofproto-dpif-xlate.h @@ -225,6 +225,11 @@ int xlate_send_packet(const struct ofport_dpif *, bool oam, struct dp_packet *); void xlate_mac_learning_update(const struct ofproto_dpif *ofproto, ofp_port_t in_port, struct eth_addr dl_src, int vlan, bool is_grat_arp); +void xlate_add_static_mac_entry(const struct ofproto_dpif *, + ofp_port_t in_port, + struct eth_addr dl_src, int vlan); +void xlate_delete_static_mac_entry(const struct ofproto_dpif *, + struct eth_addr dl_src, int vlan); void xlate_set_support(const struct ofproto_dpif *, const struct dpif_backer_support *); diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c index fd0b2fdea..97f2ac475 100644 --- a/ofproto/ofproto-dpif.c +++ b/ofproto/ofproto-dpif.c @@ -5852,18 +5852,94 @@ ofproto_unixctl_fdb_show(struct unixctl_conn *conn, int argc OVS_UNUSED, LIST_FOR_EACH (e, lru_node, &ofproto->ml->lrus) { struct ofbundle *bundle = mac_entry_get_port(ofproto->ml, e); char name[OFP_MAX_PORT_NAME_LEN]; + int age = mac_entry_age(ofproto->ml, e); ofputil_port_to_string(ofbundle_get_a_port(bundle)->up.ofp_port, - NULL, name, sizeof name); - ds_put_format(&ds, "%5s %4d "ETH_ADDR_FMT" %3d\n", - name, e->vlan, ETH_ADDR_ARGS(e->mac), - mac_entry_age(ofproto->ml, e)); + NULL, name, sizeof name); + ds_put_format(&ds, "%5s %4d "ETH_ADDR_FMT" ", + name, e->vlan, ETH_ADDR_ARGS(e->mac)); + if (MAC_ENTRY_AGE_STATIC_ENTRY == age) { + ds_put_format(&ds, "static\n"); + } else { + ds_put_format(&ds, "%3d\n", age); + } } ovs_rwlock_unlock(&ofproto->ml->rwlock); unixctl_command_reply(conn, ds_cstr(&ds)); ds_destroy(&ds); } +static void +ofproto_unixctl_fdb_update(struct unixctl_conn *conn, int argc OVS_UNUSED, + const char *argv[], void *aux OVS_UNUSED) +{ + const char *br_name = argv[1]; + const char *port_name = argv[2]; + struct eth_addr mac; + uint16_t vlan = atoi(argv[3]); + const char *op = (const char *) aux; + const struct ofproto_dpif *ofproto; + ofp_port_t in_port = OFPP_NONE; + struct ofproto_port ofproto_port; + struct ds ds = DS_EMPTY_INITIALIZER; + + ofproto = ofproto_dpif_lookup_by_name(br_name); + if (!ofproto) { + unixctl_command_reply_error(conn, "no such bridge"); + return; + } + + if (!eth_addr_from_string(argv[4], &mac)) { + unixctl_command_reply_error(conn, "bad MAC address"); + return; + } + + if (ofproto_port_query_by_name(&ofproto->up, port_name, &ofproto_port)) { + unixctl_command_reply_error(conn, + "software error, odp port is present but no ofp port"); + return; + } + in_port = ofproto_port.ofp_port; + ofproto_port_destroy(&ofproto_port); + + if (!strcmp(op, "add")) { + /* Give a bit more information if the entry being added is overriding + * an existing entry */ + const struct mac_entry *mac_entry; + const struct ofbundle *bundle = NULL; + int age; + + ovs_rwlock_rdlock(&ofproto->ml->rwlock); + mac_entry = mac_learning_lookup(ofproto->ml, mac, vlan); + if (mac_entry) { + bundle = mac_entry ? + mac_entry_get_port(ofproto->ml, mac_entry) : NULL; + age = mac_entry->expires; + } + ovs_rwlock_unlock(&ofproto->ml->rwlock); + + if (bundle && ((strcmp(bundle->name, port_name)) || + (age != MAC_ENTRY_AGE_STATIC_ENTRY))) { + char old_port_name[OFP_MAX_PORT_NAME_LEN]; + + ofputil_port_to_string(ofbundle_get_a_port(bundle)->up.ofp_port, + NULL, old_port_name, sizeof old_port_name); + ds_put_format(&ds, "Overriding already existing %s entry on %s\n", + (age == MAC_ENTRY_AGE_STATIC_ENTRY) ? "static" : "dynamic", + old_port_name); + } + + xlate_add_static_mac_entry(ofproto, in_port, mac, vlan); + unixctl_command_reply(conn, ds_cstr(&ds)); + } else if (!strcmp(op, "del")) { + xlate_delete_static_mac_entry(ofproto, mac, vlan); + unixctl_command_reply(conn, NULL); + } else { + unixctl_command_reply_error(conn, "software error, unknown op"); + } + ds_destroy(&ds); +} + static void ofproto_unixctl_fdb_stats_clear(struct unixctl_conn *conn, int argc, const char *argv[], void *aux OVS_UNUSED) @@ -6415,6 +6491,10 @@ ofproto_unixctl_init(void) } registered = true; + unixctl_command_register("fdb/add", "[bridge port vlan mac]", 4, 4, + ofproto_unixctl_fdb_update, "add"); + unixctl_command_register("fdb/del", "[bridge port vlan mac]", 4, 4, + ofproto_unixctl_fdb_update, "del"); unixctl_command_register("fdb/flush", "[bridge]", 0, 1, ofproto_unixctl_fdb_flush, NULL); unixctl_command_register("fdb/show", "bridge", 1, 1, diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at index 31064ed95..a6105df1d 100644 --- a/tests/ofproto-dpif.at +++ b/tests/ofproto-dpif.at @@ -6753,6 +6753,90 @@ PORTNAME portName=p2 ])]) +AT_SETUP([ofproto-dpif - static-mac add/del/flush]) +OVS_VSWITCHD_START([set bridge br0 fail-mode=standalone]) +add_of_ports br0 1 2 + +dnl Generate some dynamic fdb entries on some ports +OFPROTO_TRACE([ovs-dummy], [in_port(1),eth(src=50:54:00:00:00:01)], [-generate], [100,2]) +OFPROTO_TRACE([ovs-dummy], [in_port(2),eth(src=50:54:00:00:00:02)], [-generate], [100,1]) + +dnl Add some static mac entries +AT_CHECK([ovs-appctl fdb/add br0 p1 0 50:54:00:00:01:01]) +AT_CHECK([ovs-appctl fdb/add br0 p2 0 50:54:00:00:02:02]) + +dnl Check initial fdb +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 1 0 50:54:00:00:00:01 + 1 0 50:54:00:00:01:01 static + 2 0 50:54:00:00:00:02 + 2 0 50:54:00:00:02:02 static +]) + +dnl Remove static mac entry +AT_CHECK([ovs-appctl fdb/del br0 p1 0 50:54:00:00:01:01]) + +dnl Check that entry is removed +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | grep "50:54:00:00:01:01"], [1], [dnl +]) + +dnl Flush mac entries, only dynamic ones should be evicted. +AT_CHECK([ovs-appctl fdb/flush br0], [0], [dnl +table successfully flushed +]) + +dnl Check that entry is removed +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 2 0 50:54:00:00:02:02 static +]) + +OVS_VSWITCHD_STOP +AT_CLEANUP + +AT_SETUP([ofproto-dpif - static-mac mac moves]) +OVS_VSWITCHD_START([set bridge br0 fail-mode=standalone]) +add_of_ports br0 1 2 + +dnl Generate a dynamic entry +OFPROTO_TRACE([ovs-dummy], [in_port(1),eth(src=50:54:00:00:00:00)], [-generate], [100,2]) + +dnl Convert dynamically learnt dl_src to a static-mac +AT_CHECK([ovs-appctl fdb/add br0 p1 0 50:54:00:00:00:00], [0], [dnl +Overriding already existing dynamic entry on 1 +]) + +dnl Check fdb +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 1 0 50:54:00:00:00:00 static +]) + +dnl Move the static mac to different port +AT_CHECK([ovs-appctl fdb/add br0 p2 0 50:54:00:00:00:00], [0], [dnl +Overriding already existing static entry on 1 +]) + +dnl Check fdb +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 2 0 50:54:00:00:00:00 static +]) + +dnl static-mac should not be converted to a dynamic one when a packet with same dl_src +dnl arrives on any port of the switch +dnl Packet arriving on p1 +OFPROTO_TRACE([ovs-dummy], [in_port(1),eth(src=50:54:00:00:00:00)], [-generate], [100,2]) +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 2 0 50:54:00:00:00:00 static +]) + +dnl Packet arriving on p2 +OFPROTO_TRACE([ovs-dummy], [in_port(2),eth(src=50:54:00:00:00:00)], [-generate], [100,1]) +AT_CHECK_UNQUOTED([ovs-appctl fdb/show br0 | sed 's/ *[[0-9]]\{1,\}$//' | grep -v port | sort], [0], [dnl + 2 0 50:54:00:00:00:00 static +]) + +OVS_VSWITCHD_STOP +AT_CLEANUP + AT_SETUP([ofproto-dpif - basic truncate action]) OVS_VSWITCHD_START add_of_ports br0 1 2 3 4 5