diff mbox series

[net-next] Revert "net: dsa: sja1105: Clear VLAN filtering offload netdev feature"

Message ID 20210320230445.2484150-1-olteanv@gmail.com (mailing list archive)
State Accepted
Commit a1e6f641e3075fa83403c699e64623ae272080e2
Delegated to: Netdev Maintainers
Headers show
Series [net-next] Revert "net: dsa: sja1105: Clear VLAN filtering offload netdev feature" | expand

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Commit Message

Vladimir Oltean March 20, 2021, 11:04 p.m. UTC 
From: Vladimir Oltean <vladimir.oltean@nxp.com>

This reverts commit e9bf96943b408e6c99dd13fb01cb907335787c61.

The topic of the reverted patch is the support for switches with global
VLAN filtering, added by commit 061f6a505ac3 ("net: dsa: Add
ndo_vlan_rx_{add, kill}_vid implementation"). Be there a switch with 4
ports swp0 -> swp3, and the following setup:

ip link add br0 type bridge vlan_filtering 1
ip link set swp0 master br0
ip link set swp1 master br0

What would happen with VLAN-tagged traffic received on standalone ports
swp2 and swp3? Well, it would get dropped, were it not for the
.ndo_vlan_rx_add_vid and .ndo_vlan_rx_kill_vid implementations (called
from vlan_vid_add and vlan_vid_del respectively). Basically, for DSA
switches where VLAN filtering is a global attribute, we enforce the
standalone ports to have 'rx-vlan-filter: off [fixed]' in their ethtool
features, which lets the user know that all VLAN-tagged packets that are
not explicitly added in the RX filtering list are dropped.

As for the sja1105 driver, at the time of the reverted patch, it was
operating in a pretty handicapped mode when it had ports under a bridge
with vlan_filtering=1. Specifically, it was unable to terminate traffic
through the CPU port (for further explanation see "Traffic support" in
Documentation/networking/dsa/sja1105.rst).

However, since then, the sja1105 driver has made considerable progress,
and that limitation is no longer as severe now. Specifically, since
commit 2cafa72e516f ("net: dsa: sja1105: add a new
best_effort_vlan_filtering devlink parameter"), the driver is able to
perform CPU termination even when some ports are under bridges with
vlan_filtering=1. Then, since commit 8841f6e63f2c ("net: dsa: sja1105:
make devlink property best_effort_vlan_filtering true by default"), this
even became the default operating mode.

So we can now take advantage of the logic in the DSA core.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 16 ----------------
 1 file changed, 16 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org March 21, 2021, 2:30 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Sun, 21 Mar 2021 01:04:45 +0200 you wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp.com>
> 
> This reverts commit e9bf96943b408e6c99dd13fb01cb907335787c61.
> 
> The topic of the reverted patch is the support for switches with global
> VLAN filtering, added by commit 061f6a505ac3 ("net: dsa: Add
> ndo_vlan_rx_{add, kill}_vid implementation"). Be there a switch with 4
> ports swp0 -> swp3, and the following setup:
> 
> [...]

Here is the summary with links:
  - [net-next] Revert "net: dsa: sja1105: Clear VLAN filtering offload netdev feature"
    https://git.kernel.org/netdev/net-next/c/a1e6f641e307

You are awesome, thank you!
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diff mbox series

Patch

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 51ea104c63bb..d9c198ca0197 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -3049,21 +3049,6 @@  static void sja1105_teardown(struct dsa_switch *ds)
 	}
 }
 
-static int sja1105_port_enable(struct dsa_switch *ds, int port,
-			       struct phy_device *phy)
-{
-	struct net_device *slave;
-
-	if (!dsa_is_user_port(ds, port))
-		return 0;
-
-	slave = dsa_to_port(ds, port)->slave;
-
-	slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
-
-	return 0;
-}
-
 static void sja1105_port_disable(struct dsa_switch *ds, int port)
 {
 	struct sja1105_private *priv = ds->priv;
@@ -3491,7 +3476,6 @@  static const struct dsa_switch_ops sja1105_switch_ops = {
 	.get_ethtool_stats	= sja1105_get_ethtool_stats,
 	.get_sset_count		= sja1105_get_sset_count,
 	.get_ts_info		= sja1105_get_ts_info,
-	.port_enable		= sja1105_port_enable,
 	.port_disable		= sja1105_port_disable,
 	.port_fdb_dump		= sja1105_fdb_dump,
 	.port_fdb_add		= sja1105_fdb_add,