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[ovs-dev] mac-learning: Fix learned fdb entries not age out issue.

Message ID SY4PR01MB84380CF341B689C71F3570B7CD2A9@SY4PR01MB8438.ausprd01.prod.outlook.com
State Superseded
Headers show
Series [ovs-dev] mac-learning: Fix learned fdb entries not age out issue. | expand

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Commit Message

lin huang Oct. 20, 2022, 3:06 p.m. UTC
From: Lin Huang <linhuang@ruijie.com.cn>

After user add a static fdb entry, the get_lru() function will always return
the static fdb entry. That's normal fdb entries will not age out through mac_learning_run().

Fix the issue by modify the get_lru() function to check the entry->expires field and
not return the entry which entry->expires is MAC_ENTRY_AGE_STATIC_ENTRY.

Adding a unit test for this.

Fixes: ccc24fc88d59 ("ofproto-dpif: APIs and CLI option to add/delete static fdb entry.")
Tested-by: Zhang Yuhuang <zhangyuhuang@ruijie.com.cn>
Signed-off-by: Lin Huang <linhuang@ruijie.com.cn>
---
 lib/mac-learning.c    | 36 +++++++++++++-----------------------
 tests/ofproto-dpif.at | 23 +++++++++++++++++++++++
 2 files changed, 36 insertions(+), 23 deletions(-)

Comments

Eelco Chaudron Oct. 21, 2022, 8:37 a.m. UTC | #1
On 20 Oct 2022, at 17:06, miterv@outlook.com wrote:

> From: Lin Huang <linhuang@ruijie.com.cn>
>
> After user add a static fdb entry, the get_lru() function will always return
> the static fdb entry. That's normal fdb entries will not age out through mac_learning_run().
>
> Fix the issue by modify the get_lru() function to check the entry->expires field and
> not return the entry which entry->expires is MAC_ENTRY_AGE_STATIC_ENTRY.
>
> Adding a unit test for this.
>
> Fixes: ccc24fc88d59 ("ofproto-dpif: APIs and CLI option to add/delete static fdb entry.")
> Tested-by: Zhang Yuhuang <zhangyuhuang@ruijie.com.cn>
> Signed-off-by: Lin Huang <linhuang@ruijie.com.cn>

Hi Lin,

Thanks for fixing the comments. There is one small nit which, maybe Ilya can fix at commit time.

Also, next time, please add a version reference to the subject line if you send out an updated version (and some version history).

Thanks,

Eelco

Acked-by: Eelco Chaudron <echaudro@redhat.com>

> ---
>  lib/mac-learning.c    | 36 +++++++++++++-----------------------
>  tests/ofproto-dpif.at | 23 +++++++++++++++++++++++
>  2 files changed, 36 insertions(+), 23 deletions(-)
>
> diff --git a/lib/mac-learning.c b/lib/mac-learning.c
> index a60794fb2..e8ead51af 100644
> --- a/lib/mac-learning.c
> +++ b/lib/mac-learning.c
> @@ -176,12 +176,17 @@ get_lru(struct mac_learning *ml, struct mac_entry **e)
>      OVS_REQ_RDLOCK(ml->rwlock)
>  {
>      if (!ovs_list_is_empty(&ml->lrus)) {
> -        *e = mac_entry_from_lru_node(ml->lrus.next);
> -        return true;
> -    } else {
> -        *e = NULL;
> -        return false;
> +        struct mac_entry *entry;

Please add cr/lf after definitions and beginning of code.

> +        LIST_FOR_EACH (entry, lru_node, &ml->lrus) {
> +            if (entry->expires != MAC_ENTRY_AGE_STATIC_ENTRY) {
> +                *e = entry;
> +                return true;
> +            }
> +        }
>      }
> +
> +    *e = NULL;
> +    return false;
>  }
>
>  static unsigned int
> @@ -618,25 +623,10 @@ mac_learning_expire(struct mac_learning *ml, struct mac_entry *e)
>  void
>  mac_learning_flush(struct mac_learning *ml)
>  {
> -    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;
> -            }
> +    struct mac_entry *e;
>
> -            /* Remove from lru head and append it to tail. */
> -            ovs_list_remove(&e->lru_node);
> -            ovs_list_push_back(&ml->lrus, &e->lru_node);
> -        } else {
> -            mac_learning_expire(ml, e);
> -        }
> +    while (get_lru(ml, &e)) {
> +        mac_learning_expire(ml, e);
>      }
>      hmap_shrink(&ml->table);
>  }
> diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
> index 8e993c585..eb4cd1896 100644
> --- a/tests/ofproto-dpif.at
> +++ b/tests/ofproto-dpif.at
> @@ -7287,6 +7287,29 @@ AT_CHECK([ovs-appctl coverage/read-counter mac_learning_static_none_move], [0],
>  OVS_VSWITCHD_STOP
>  AT_CLEANUP
>
> +AT_SETUP([ofproto-dpif - static-mac learned mac age out])
> +OVS_VSWITCHD_START([set bridge br0 fail-mode=standalone -- set bridge br0 other_config:mac-aging-time=5])
> +add_of_ports br0 1 2
> +
> +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 Generate some dynamic fdb entries on some ports.
> +OFPROTO_TRACE([ovs-dummy], [in_port(1),eth(src=60:54:00:00:00:01)], [-generate], [100,2])
> +OFPROTO_TRACE([ovs-dummy], [in_port(2),eth(src=60:54:00:00:00:02)], [-generate], [100,1])
> +
> +dnl Waiting for aging out.
> +ovs-appctl time/warp 20000
> +
> +dnl Count number of static entries remaining.
> +AT_CHECK_UNQUOTED([ovs-appctl fdb/stats-show br0 | grep expired], [0], [dnl
> +  Total number of expired MAC entries     : 2
> +])
> +
> +OVS_VSWITCHD_STOP
> +AT_CLEANUP
> +
>  AT_SETUP([ofproto-dpif - basic truncate action])
>  OVS_VSWITCHD_START
>  add_of_ports br0 1 2 3 4 5
> -- 
> 2.27.0
diff mbox series

Patch

diff --git a/lib/mac-learning.c b/lib/mac-learning.c
index a60794fb2..e8ead51af 100644
--- a/lib/mac-learning.c
+++ b/lib/mac-learning.c
@@ -176,12 +176,17 @@  get_lru(struct mac_learning *ml, struct mac_entry **e)
     OVS_REQ_RDLOCK(ml->rwlock)
 {
     if (!ovs_list_is_empty(&ml->lrus)) {
-        *e = mac_entry_from_lru_node(ml->lrus.next);
-        return true;
-    } else {
-        *e = NULL;
-        return false;
+        struct mac_entry *entry;
+        LIST_FOR_EACH (entry, lru_node, &ml->lrus) {
+            if (entry->expires != MAC_ENTRY_AGE_STATIC_ENTRY) {
+                *e = entry;
+                return true;
+            }
+        }
     }
+
+    *e = NULL;
+    return false;
 }
 
 static unsigned int
@@ -618,25 +623,10 @@  mac_learning_expire(struct mac_learning *ml, struct mac_entry *e)
 void
 mac_learning_flush(struct mac_learning *ml)
 {
-    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;
-            }
+    struct mac_entry *e;
 
-            /* Remove from lru head and append it to tail. */
-            ovs_list_remove(&e->lru_node);
-            ovs_list_push_back(&ml->lrus, &e->lru_node);
-        } else {
-            mac_learning_expire(ml, e);
-        }
+    while (get_lru(ml, &e)) {
+        mac_learning_expire(ml, e);
     }
     hmap_shrink(&ml->table);
 }
diff --git a/tests/ofproto-dpif.at b/tests/ofproto-dpif.at
index 8e993c585..eb4cd1896 100644
--- a/tests/ofproto-dpif.at
+++ b/tests/ofproto-dpif.at
@@ -7287,6 +7287,29 @@  AT_CHECK([ovs-appctl coverage/read-counter mac_learning_static_none_move], [0],
 OVS_VSWITCHD_STOP
 AT_CLEANUP
 
+AT_SETUP([ofproto-dpif - static-mac learned mac age out])
+OVS_VSWITCHD_START([set bridge br0 fail-mode=standalone -- set bridge br0 other_config:mac-aging-time=5])
+add_of_ports br0 1 2
+
+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 Generate some dynamic fdb entries on some ports.
+OFPROTO_TRACE([ovs-dummy], [in_port(1),eth(src=60:54:00:00:00:01)], [-generate], [100,2])
+OFPROTO_TRACE([ovs-dummy], [in_port(2),eth(src=60:54:00:00:00:02)], [-generate], [100,1])
+
+dnl Waiting for aging out.
+ovs-appctl time/warp 20000
+
+dnl Count number of static entries remaining.
+AT_CHECK_UNQUOTED([ovs-appctl fdb/stats-show br0 | grep expired], [0], [dnl
+  Total number of expired MAC entries     : 2
+])
+
+OVS_VSWITCHD_STOP
+AT_CLEANUP
+
 AT_SETUP([ofproto-dpif - basic truncate action])
 OVS_VSWITCHD_START
 add_of_ports br0 1 2 3 4 5