linux-kernel - Re: [PATCH v2 net-next 4/6] net: dsa: exit early in dsa_slave_switchdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 12 Dec 2020 19:29:34 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Marek Behun <marek.behun@....cz>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [PATCH v2 net-next 4/6] net: dsa: exit early in
 dsa_slave_switchdev_event if we can't program the FDB



On 12/12/2020 6:40 PM, Vladimir Oltean wrote:
> Right now, the following would happen for a switch driver that does not
> implement .port_fdb_add or .port_fdb_del.
> 
> dsa_slave_switchdev_event returns NOTIFY_OK and schedules:
> -> dsa_slave_switchdev_event_work
>    -> dsa_port_fdb_add
>       -> dsa_port_notify(DSA_NOTIFIER_FDB_ADD)
>          -> dsa_switch_fdb_add
>             -> if (!ds->ops->port_fdb_add) return -EOPNOTSUPP;
>    -> an error is printed with dev_dbg, and
>       dsa_fdb_offload_notify(switchdev_work) is not called.
> 
> We can avoid scheduling the worker for nothing and say NOTIFY_OK.

Not sure if this comment is intended to describe what is being added,
only if you have to respin, should this be NOTIFY_DONE?

> Because we don't call dsa_fdb_offload_notify, the static FDB entry will
> remain just in the software bridge.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian