[ovs-dev] [vlan-maint 2/2] vswitchd: Make the MAC entry aging time configurable.
Ethan Jackson
ethan at nicira.com
Mon Jan 23 22:58:24 UTC 2012
s/agin/aging/
It may be worth documenting the allowed range in vswitchd.xml, I don't
feel strongly about it though.
Looks good,
Ethan
On Mon, Jan 23, 2012 at 14:43, Ben Pfaff <blp at nicira.com> wrote:
> NICS-11.
> Signed-off-by: Ben Pfaff <blp at nicira.com>
> ---
> lib/learning-switch.c | 6 ++++--
> lib/mac-learning.c | 41 ++++++++++++++++++++++++++++++++++-------
> lib/mac-learning.h | 10 +++++++---
> ofproto/ofproto.c | 4 ++--
> vswitchd/bridge.c | 14 ++++++++++++--
> vswitchd/vswitch.xml | 6 ++++++
> 6 files changed, 65 insertions(+), 16 deletions(-)
>
> diff --git a/lib/learning-switch.c b/lib/learning-switch.c
> index ca97054..5b1996c 100644
> --- a/lib/learning-switch.c
> +++ b/lib/learning-switch.c
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
> + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks.
> *
> * Licensed under the Apache License, Version 2.0 (the "License");
> * you may not use this file except in compliance with the License.
> @@ -96,7 +96,9 @@ lswitch_create(struct rconn *rconn, const struct lswitch_config *cfg)
> sw->max_idle = cfg->max_idle;
> sw->datapath_id = 0;
> sw->last_features_request = time_now() - 1;
> - sw->ml = cfg->mode == LSW_LEARN ? mac_learning_create() : NULL;
> + sw->ml = (cfg->mode == LSW_LEARN
> + ? mac_learning_create(MAC_ENTRY_DEFAULT_IDLE_TIME)
> + : NULL);
> sw->action_normal = cfg->mode == LSW_NORMAL;
>
> flow_wildcards_init_exact(&sw->wc);
> diff --git a/lib/mac-learning.c b/lib/mac-learning.c
> index b7320e8..5efa44d 100644
> --- a/lib/mac-learning.c
> +++ b/lib/mac-learning.c
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2008, 2009, 2010 Nicira Networks.
> + * Copyright (c) 2008, 2009, 2010, 2012 Nicira Networks.
> *
> * Licensed under the Apache License, Version 2.0 (the "License");
> * you may not use this file except in compliance with the License.
> @@ -36,12 +36,12 @@ VLOG_DEFINE_THIS_MODULE(mac_learning);
> COVERAGE_DEFINE(mac_learning_learned);
> COVERAGE_DEFINE(mac_learning_expired);
>
> -/* Returns the number of seconds since 'e' was last learned. */
> +/* Returns the number of seconds since 'e' (within 'ml') was last learned. */
> int
> -mac_entry_age(const struct mac_entry *e)
> +mac_entry_age(const struct mac_learning *ml, const struct mac_entry *e)
> {
> time_t remaining = e->expires - time_now();
> - return MAC_ENTRY_IDLE_TIME - remaining;
> + return ml->idle_time - remaining;
> }
>
> static uint32_t
> @@ -115,9 +115,18 @@ free_mac_entry(struct mac_learning *ml, struct mac_entry *e)
> list_push_front(&ml->free, &e->lru_node);
> }
>
> -/* Creates and returns a new MAC learning table. */
> +static unsigned int
> +normalize_idle_time(unsigned int idle_time)
> +{
> + return (idle_time < 15 ? 15
> + : idle_time > 3600 ? 3600
> + : idle_time);
> +}
> +
> +/* Creates and returns a new MAC learning table with an initial MAC aging
> + * timeout of 'idle_time' seconds. */
> struct mac_learning *
> -mac_learning_create(void)
> +mac_learning_create(unsigned int idle_time)
> {
> struct mac_learning *ml;
> int i;
> @@ -134,6 +143,7 @@ mac_learning_create(void)
> }
> ml->secret = random_uint32();
> ml->flood_vlans = NULL;
> + ml->idle_time = normalize_idle_time(idle_time);
> return ml;
> }
>
> @@ -164,6 +174,23 @@ mac_learning_set_flood_vlans(struct mac_learning *ml, unsigned long *bitmap)
> return ret;
> }
>
> +/* Changes the MAC agin timeout of 'ml' to 'idle_time' seconds. */
> +void
> +mac_learning_set_idle_time(struct mac_learning *ml, unsigned int idle_time)
> +{
> + idle_time = normalize_idle_time(idle_time);
> + if (idle_time != ml->idle_time) {
> + struct mac_entry *e;
> + int delta;
> +
> + delta = (int) idle_time - (int) ml->idle_time;
> + LIST_FOR_EACH (e, lru_node, &ml->lrus) {
> + e->expires += delta;
> + }
> + ml->idle_time = idle_time;
> + }
> +}
> +
> static bool
> is_learning_vlan(const struct mac_learning *ml, uint16_t vlan)
> {
> @@ -222,7 +249,7 @@ mac_learning_learn(struct mac_learning *ml,
> /* Make the entry most-recently-used. */
> list_remove(&e->lru_node);
> list_push_back(&ml->lrus, &e->lru_node);
> - e->expires = time_now() + MAC_ENTRY_IDLE_TIME;
> + e->expires = time_now() + ml->idle_time;
> if (lock_type == GRAT_ARP_LOCK_SET) {
> e->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
> }
> diff --git a/lib/mac-learning.h b/lib/mac-learning.h
> index 9c59fa0..9a5a52e 100644
> --- a/lib/mac-learning.h
> +++ b/lib/mac-learning.h
> @@ -22,6 +22,8 @@
> #include "packets.h"
> #include "tag.h"
>
> +struct mac_learning;
> +
> #define MAC_HASH_BITS 10
> #define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
> #define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
> @@ -29,7 +31,7 @@
> #define MAC_MAX 2048
>
> /* Time, in seconds, before expiring a mac_entry due to inactivity. */
> -#define MAC_ENTRY_IDLE_TIME 300
> +#define MAC_ENTRY_DEFAULT_IDLE_TIME 300
>
> /* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
> * relearning based on a reflection from a bond slave. */
> @@ -53,7 +55,7 @@ struct mac_entry {
> tag_type tag; /* Tag for this learning entry. */
> };
>
> -int mac_entry_age(const struct mac_entry *);
> +int mac_entry_age(const struct mac_learning *, const struct mac_entry *);
>
> /* MAC learning table. */
> struct mac_learning {
> @@ -64,12 +66,14 @@ struct mac_learning {
> struct mac_entry entries[MAC_MAX]; /* All entries. */
> uint32_t secret; /* Secret for randomizing hash table. */
> unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
> + unsigned int idle_time; /* Max age before deleting an entry. */
> };
>
> -struct mac_learning *mac_learning_create(void);
> +struct mac_learning *mac_learning_create(unsigned int idle_time);
> void mac_learning_destroy(struct mac_learning *);
> bool mac_learning_set_flood_vlans(struct mac_learning *,
> unsigned long *bitmap);
> +void mac_learning_set_idle_time(struct mac_learning *, unsigned int idle_time);
> tag_type mac_learning_learn(struct mac_learning *,
> const uint8_t src[ETH_ADDR_LEN], uint16_t vlan,
> uint16_t src_port, enum grat_arp_lock_type
> diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c
> index 9bcef2c..37e2ad9 100644
> --- a/ofproto/ofproto.c
> +++ b/ofproto/ofproto.c
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2009, 2010, 2011 Nicira Networks.
> + * Copyright (c) 2009, 2010, 2011, 2012 Nicira Networks.
> * Copyright (c) 2010 Jean Tourrilhes - HP-Labs.
> *
> * Licensed under the Apache License, Version 2.0 (the "License");
> @@ -515,7 +515,7 @@ ofproto_create(const char *datapath, const char *datapath_type,
> } else {
> p->ofhooks = &default_ofhooks;
> p->aux = p;
> - p->ml = mac_learning_create();
> + p->ml = mac_learning_create(MAC_ENTRY_DEFAULT_IDLE_TIME);
> }
>
> /* Pick final datapath ID. */
> diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
> index fb2ad83..b2303d0 100644
> --- a/vswitchd/bridge.c
> +++ b/vswitchd/bridge.c
> @@ -1584,7 +1584,8 @@ bridge_unixctl_fdb_show(struct unixctl_conn *conn,
> }
> ds_put_format(&ds, "%5d %4d "ETH_ADDR_FMT" %3d\n",
> br->ports[e->port]->ifaces[0]->dp_ifidx,
> - e->vlan, ETH_ADDR_ARGS(e->mac), mac_entry_age(e));
> + e->vlan, ETH_ADDR_ARGS(e->mac),
> + mac_entry_age(br->ml, e));
> }
> unixctl_command_reply(conn, 200, ds_cstr(&ds));
> ds_destroy(&ds);
> @@ -1714,7 +1715,7 @@ bridge_create(const struct ovsrec_bridge *br_cfg)
>
> br->name = xstrdup(br_cfg->name);
> br->cfg = br_cfg;
> - br->ml = mac_learning_create();
> + br->ml = mac_learning_create(MAC_ENTRY_DEFAULT_IDLE_TIME);
> eth_addr_nicira_random(br->default_ea);
>
> hmap_init(&br->ifaces);
> @@ -1867,6 +1868,8 @@ bridge_reconfigure_one(struct bridge *br)
> struct svec snoops, old_snoops;
> struct shash_node *node;
> enum ofproto_fail_mode fail_mode;
> + const char *idle_time_str;
> + int idle_time;
> size_t i;
>
> /* Collect old ports. */
> @@ -1946,6 +1949,13 @@ bridge_reconfigure_one(struct bridge *br)
> }
> ofproto_set_fail_mode(br->ofproto, fail_mode);
>
> + /* Set the MAC learning aging timeout. */
> + idle_time_str = bridge_get_other_config(br->cfg, "mac-aging-time");
> + idle_time = (idle_time_str && atoi(idle_time_str)
> + ? atoi(idle_time_str)
> + : MAC_ENTRY_DEFAULT_IDLE_TIME);
> + mac_learning_set_idle_time(br->ml, idle_time);
> +
> /* Delete all flows if we're switching from connected to standalone or vice
> * versa. (XXX Should we delete all flows if we are switching from one
> * controller to another?) */
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
> index 2f77669..c574434 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -437,6 +437,12 @@
> does not have QoS configured, or if the port does not have a queue
> with the specified ID, the default queue is used instead.
> </dd>
> + <dt><code>mac-aging-time</code></dt>
> + <dd>
> + A positive integer specifying the maximum number of seconds to
> + retain a MAC learning entry for which no packets have been seen.
> + The default is currently 300 seconds (5 minutes).
> + </dd>
> </dl>
> </column>
> </group>
> --
> 1.7.2.5
>
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