> > Plus, i'm not actually sure we should be issuing warnings here. What
> > does the bridge code do in this case? Is it silent and just does it,
> > or does it issue a warning?
>
> :D
>
> What Oleksij doesn't know, I bet, is that he's using the bridge bypass
> commands:
>
> bridge fdb add dev lan0 00:01:02:03:04:05
>
> That is the deprecated way of managing FDB entries, and has several
> disadvantages such as:
> - the bridge software FDB never gets updated with this entry, so other
> drivers which might be subscribed to DSA's FDB (imagine a non-DSA
> driver having the same logic as our ds->assisted_learning_on_cpu_port)
> will never see these FDB entries
> - you have to manage duplicates yourself
I was actually meaning a pure software bridge, with unaccelerated
interfaces. It has a dynamic MAC address in its tables, and the user
adds a static. Ideally, we want the same behaviour.
And i think the answer is:
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid)
{
struct net_bridge_fdb_entry *fdb;
if (!is_valid_ether_addr(addr))
return -EINVAL;
fdb = br_fdb_find(br, addr, vid);
if (fdb) {
/* it is okay to have multiple ports with same
* address, just use the first one.
*/
if (test_bit(BR_FDB_LOCAL, &fdb->flags))
return 0;
br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
source ? source->dev->name : br->dev->name, addr, vid);
fdb_delete(br, fdb, true);
}
fdb = fdb_create(br, source, addr, vid,
BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC));
if (!fdb)
return -ENOMEM;
fdb_add_hw_addr(br, addr);
fdb_notify(br, fdb, RTM_NEWNEIGH, true);
return 0;
}
So it looks like it warns and then replaces the dynamic entry.
So having the DSA driver also warn is maybe O.K. Having said that, i
don't think any other DSA driver does.
Andrew
