From: Andrew Lunn <andrew@lunn.ch>
To: Tobias Waldekranz <tobias@waldekranz.com>
Cc: davem@davemloft.net, kuba@kernel.org, vivien.didelot@gmail.com,
f.fainelli@gmail.com, olteanv@gmail.com, j.vosburgh@gmail.com,
vfalico@gmail.com, andy@greyhouse.net, netdev@vger.kernel.org
Subject: Re: [PATCH v3 net-next 2/4] net: dsa: Link aggregation support
Date: Fri, 4 Dec 2020 03:20:25 +0100 [thread overview]
Message-ID: <20201204022025.GC2414548@lunn.ch> (raw)
In-Reply-To: <20201202091356.24075-3-tobias@waldekranz.com>
> +static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
> +{
> + struct dsa_port *dp;
> + unsigned int num;
> +
> + list_for_each_entry(dp, &dst->ports, list)
> + num = dp->ds->num_lags;
> +
> + list_for_each_entry(dp, &dst->ports, list)
> + num = min(num, dp->ds->num_lags);
Do you really need to loop over the list twice? Cannot num be
initialised to UINT_MAX and then just do the second loop.
> +static inline bool dsa_port_can_offload(struct dsa_port *dp,
> + struct net_device *dev)
That name is a bit generic. We have a number of different offloads.
The mv88E6060 cannot offload anything!
> +{
> + /* Switchdev offloading can be configured on: */
> +
> + if (dev == dp->slave)
> + /* DSA ports directly connected to a bridge. */
> + return true;
> +
> + if (dp->lag && dev == rtnl_dereference(dp->lag->dev))
> + /* DSA ports connected to a bridge via a LAG */
> + return true;
> +
> + return false;
> +}
> +static void dsa_lag_put(struct dsa_switch_tree *dst, struct dsa_lag *lag)
> +{
> + if (!refcount_dec_and_test(&lag->refcount))
> + return;
> +
> + clear_bit(lag->id, dst->lags.busy);
> + WRITE_ONCE(lag->dev, NULL);
> + memset(lag, 0, sizeof(*lag));
> +}
I don't know what the locking is here, but wouldn't it be safer to
clear the bit last, after the memset and WRITE_ONCE.
Andrew
next prev parent reply other threads:[~2020-12-04 2:21 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 9:13 [PATCH v3 net-next 0/4] net: dsa: Link aggregation support Tobias Waldekranz
2020-12-02 9:13 ` [PATCH v3 net-next 1/4] net: bonding: Notify ports about their initial state Tobias Waldekranz
2020-12-02 19:09 ` Jay Vosburgh
2020-12-02 21:52 ` Tobias Waldekranz
2020-12-03 0:39 ` Jay Vosburgh
2020-12-03 8:16 ` Tobias Waldekranz
2020-12-02 9:13 ` [PATCH v3 net-next 2/4] net: dsa: Link aggregation support Tobias Waldekranz
2020-12-02 10:07 ` Vladimir Oltean
2020-12-02 10:51 ` Tobias Waldekranz
2020-12-02 18:58 ` Jakub Kicinski
2020-12-02 21:29 ` Tobias Waldekranz
2020-12-02 21:32 ` Vladimir Oltean
2020-12-03 16:24 ` Vladimir Oltean
2020-12-03 20:53 ` Tobias Waldekranz
2020-12-03 21:09 ` Andrew Lunn
2020-12-03 21:35 ` Tobias Waldekranz
2020-12-04 0:35 ` Vladimir Oltean
2020-12-03 21:57 ` Vladimir Oltean
2020-12-03 23:12 ` Tobias Waldekranz
2020-12-04 0:56 ` Vladimir Oltean
2020-12-07 21:49 ` Tobias Waldekranz
2020-12-04 1:33 ` Andrew Lunn
2020-12-04 4:18 ` Florian Fainelli
2020-12-07 21:56 ` Tobias Waldekranz
2020-12-03 20:48 ` Vladimir Oltean
2020-12-04 2:20 ` Andrew Lunn [this message]
2020-12-07 21:19 ` Tobias Waldekranz
2020-12-07 23:26 ` Andrew Lunn
2020-12-09 8:57 ` Tobias Waldekranz
2020-12-09 14:27 ` Andrew Lunn
2020-12-09 15:21 ` Tobias Waldekranz
2020-12-09 23:03 ` Andrew Lunn
2020-12-04 4:04 ` Florian Fainelli
2020-12-08 11:23 ` Vladimir Oltean
2020-12-08 15:33 ` Tobias Waldekranz
2020-12-08 16:37 ` Vladimir Oltean
2020-12-09 8:37 ` Tobias Waldekranz
2020-12-09 10:53 ` Vladimir Oltean
2020-12-09 14:11 ` Tobias Waldekranz
2020-12-09 16:04 ` Vladimir Oltean
2020-12-09 22:01 ` Tobias Waldekranz
2020-12-09 22:21 ` Vladimir Oltean
2020-12-10 10:18 ` Tobias Waldekranz
2020-12-09 22:59 ` Andrew Lunn
2020-12-10 1:05 ` Vladimir Oltean
2020-12-09 14:23 ` Andrew Lunn
2020-12-09 23:17 ` Vladimir Oltean
2020-12-08 17:26 ` Andrew Lunn
2020-12-11 20:50 ` Tobias Waldekranz
2020-12-12 14:26 ` Vladimir Oltean
2020-12-13 21:18 ` Tobias Waldekranz
2020-12-14 0:12 ` Vladimir Oltean
2020-12-14 11:42 ` Ido Schimmel
2020-12-16 15:15 ` Tobias Waldekranz
2020-12-16 18:48 ` Ido Schimmel
2020-12-14 9:41 ` Tobias Waldekranz
2020-12-02 9:13 ` [PATCH v3 net-next 3/4] net: dsa: mv88e6xxx: " Tobias Waldekranz
2020-12-02 9:13 ` [PATCH v3 net-next 4/4] net: dsa: tag_dsa: Support reception of packets from LAG devices Tobias Waldekranz
2020-12-04 3:58 ` Florian Fainelli
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