On 27/04/17 11:08, Arkadi Sharshevsky wrote:
> Commit 7e26bf45e4cb ("net: bridge: allow SW learn to take over HW fdb
> entries") added the ability to "take over an entry which was previously
> learned via HW when it shows up from a SW port".
>
> However, if an entry was learned via HW and then a control packet
> (e.g., ARP request) was trapped to the CPU, the bridge driver will
> update the entry and remove the externally learned flag, although the
> entry is still present in HW. Instead, only clear the externally learned
> flag in case of roaming.
>
> Fixes: 7e26bf45e4cb ("net: bridge: allow SW learn to take over HW fdb entries")
> Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxxxx>
> Signed-off-by: Arkadi Sharashevsky <arkadis@xxxxxxxxxxxx>
> Cc: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
> ---
> net/bridge/br_fdb.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index 5a40a87..ab0c7cc 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -589,14 +589,14 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
> if (unlikely(source != fdb->dst)) {
> fdb->dst = source;
> fdb_modified = true;
> + /* Take over HW learned entry */
> + if (unlikely(fdb->added_by_external_learn))
> + fdb->added_by_external_learn = 0;
> }
> if (now != fdb->updated)
> fdb->updated = now;
> if (unlikely(added_by_user))
> fdb->added_by_user = 1;
> - /* Take over HW learned entry */
> - if (unlikely(fdb->added_by_external_learn))
> - fdb->added_by_external_learn = 0;
> if (unlikely(fdb_modified))
> fdb_notify(br, fdb, RTM_NEWNEIGH);
> }
>
Wait, this won't apply to latest net-next due to my patch that added
fdb_modified when changing the ext learned flag. I think you'll have to
respin on top of latest net-next.
