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ddcebda08b
Add kernel tag that introduced the patch on backport patch. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
90 lines
3.2 KiB
Diff
90 lines
3.2 KiB
Diff
From e83d56537859849f2223b90749e554831b1f3c27 Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Wed, 2 Feb 2022 01:03:21 +0100
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Subject: [PATCH 02/16] net: dsa: replay master state events in
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dsa_tree_{setup,teardown}_master
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In order for switch driver to be able to make simple and reliable use of
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the master tracking operations, they must also be notified of the
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initial state of the DSA master, not just of the changes. This is
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because they might enable certain features only during the time when
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they know that the DSA master is up and running.
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Therefore, this change explicitly checks the state of the DSA master
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under the same rtnl_mutex as we were holding during the
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dsa_master_setup() and dsa_master_teardown() call. The idea being that
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if the DSA master became operational in between the moment in which it
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became a DSA master (dsa_master_setup set dev->dsa_ptr) and the moment
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when we checked for the master being up, there is a chance that we
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would emit a ->master_state_change() call with no actual state change.
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We need to avoid that by serializing the concurrent netdevice event with
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us. If the netdevice event started before, we force it to finish before
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we begin, because we take rtnl_lock before making netdev_uses_dsa()
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return true. So we also handle that early event and do nothing on it.
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Similarly, if the dev_open() attempt is concurrent with us, it will
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attempt to take the rtnl_mutex, but we're holding it. We'll see that
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the master flag IFF_UP isn't set, then when we release the rtnl_mutex
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we'll process the NETDEV_UP notifier.
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/dsa/dsa2.c | 28 ++++++++++++++++++++++++----
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1 file changed, 24 insertions(+), 4 deletions(-)
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--- a/net/dsa/dsa2.c
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+++ b/net/dsa/dsa2.c
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@@ -15,6 +15,7 @@
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include <net/devlink.h>
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+#include <net/sch_generic.h>
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#include "dsa_priv.h"
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@@ -1060,9 +1061,18 @@ static int dsa_tree_setup_master(struct
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list_for_each_entry(dp, &dst->ports, list) {
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if (dsa_port_is_cpu(dp)) {
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- err = dsa_master_setup(dp->master, dp);
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+ struct net_device *master = dp->master;
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+ bool admin_up = (master->flags & IFF_UP) &&
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+ !qdisc_tx_is_noop(master);
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+
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+ err = dsa_master_setup(master, dp);
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if (err)
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return err;
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+
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+ /* Replay master state event */
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+ dsa_tree_master_admin_state_change(dst, master, admin_up);
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+ dsa_tree_master_oper_state_change(dst, master,
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+ netif_oper_up(master));
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}
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}
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@@ -1077,9 +1087,19 @@ static void dsa_tree_teardown_master(str
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rtnl_lock();
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- list_for_each_entry(dp, &dst->ports, list)
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- if (dsa_port_is_cpu(dp))
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- dsa_master_teardown(dp->master);
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+ list_for_each_entry(dp, &dst->ports, list) {
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+ if (dsa_port_is_cpu(dp)) {
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+ struct net_device *master = dp->master;
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+
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+ /* Synthesizing an "admin down" state is sufficient for
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+ * the switches to get a notification if the master is
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+ * currently up and running.
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+ */
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+ dsa_tree_master_admin_state_change(dst, master, false);
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+
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+ dsa_master_teardown(master);
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+ }
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+ }
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rtnl_unlock();
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}
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