diff mbox series

[v3,net-next,6/9] net: dsa: all DSA masters must be down when changing the tagging protocol

Message ID 20220819174820.3585002-7-vladimir.oltean@nxp.com (mailing list archive)
State Accepted
Commit f41ec1fd1c20e2a4e60a4ab8490b3e63423c0a8a
Delegated to: Netdev Maintainers
Headers show
Series DSA changes for multiple CPU ports (part 3) | expand

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Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2040 this patch: 2040
netdev/cc_maintainers success CCed 9 of 9 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2040 this patch: 2040
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 39 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Vladimir Oltean Aug. 19, 2022, 5:48 p.m. UTC 
The fact that the tagging protocol is set and queried from the
/sys/class/net/<dsa-master>/dsa/tagging file is a bit of a quirk from
the single CPU port days which isn't aging very well now that DSA can
have more than a single CPU port. This is because the tagging protocol
is a switch property, yet in the presence of multiple CPU ports it can
be queried and set from multiple sysfs files, all of which are handled
by the same implementation.

The current logic ensures that the net device whose sysfs file we're
changing the tagging protocol through must be down. That net device is
the DSA master, and this is fine for single DSA master / CPU port setups.

But exactly because the tagging protocol is per switch [ tree, in fact ]
and not per DSA master, this isn't fine any longer with multiple CPU
ports, and we must iterate through the tree and find all DSA masters,
and make sure that all of them are down.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
v1->v3: none

 net/dsa/dsa2.c     | 10 +++-------
 net/dsa/dsa_priv.h |  1 -
 net/dsa/master.c   |  2 +-
 3 files changed, 4 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index cac48a741f27..b2fe62bfe8dd 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -1238,7 +1238,6 @@  static int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst,
  * they would have formed disjoint trees (different "dsa,member" values).
  */
 int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
-			      struct net_device *master,
 			      const struct dsa_device_ops *tag_ops,
 			      const struct dsa_device_ops *old_tag_ops)
 {
@@ -1254,14 +1253,11 @@  int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
 	 * attempts to change the tagging protocol. If we ever lift the IFF_UP
 	 * restriction, there needs to be another mutex which serializes this.
 	 */
-	if (master->flags & IFF_UP)
-		goto out_unlock;
-
 	list_for_each_entry(dp, &dst->ports, list) {
-		if (!dsa_port_is_user(dp))
-			continue;
+		if (dsa_port_is_cpu(dp) && (dp->master->flags & IFF_UP))
+			goto out_unlock;
 
-		if (dp->slave->flags & IFF_UP)
+		if (dsa_port_is_user(dp) && (dp->slave->flags & IFF_UP))
 			goto out_unlock;
 	}
 
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index d9722e49864b..cc1cc866dc42 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -545,7 +545,6 @@  struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst,
 int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v);
 int dsa_broadcast(unsigned long e, void *v);
 int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
-			      struct net_device *master,
 			      const struct dsa_device_ops *tag_ops,
 			      const struct dsa_device_ops *old_tag_ops);
 void dsa_tree_master_admin_state_change(struct dsa_switch_tree *dst,
diff --git a/net/dsa/master.c b/net/dsa/master.c
index 2851e44c4cf0..32c0a00a8b92 100644
--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -307,7 +307,7 @@  static ssize_t tagging_store(struct device *d, struct device_attribute *attr,
 		 */
 		goto out;
 
-	err = dsa_tree_change_tag_proto(cpu_dp->ds->dst, dev, new_tag_ops,
+	err = dsa_tree_change_tag_proto(cpu_dp->ds->dst, new_tag_ops,
 					old_tag_ops);
 	if (err) {
 		/* On failure the old tagger is restored, so we don't need the