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54 lines
2.1 KiB
Diff
54 lines
2.1 KiB
Diff
From 93a32fc4f43ae40a2140acd9258faada11a98ec0 Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Mon, 18 Nov 2019 20:16:57 +0200
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Subject: [PATCH] net: dsa: felix: Fix CPU port assignment when not last port
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On the NXP LS1028A, there are 2 Ethernet links between the Felix switch
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and the ENETC:
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- eno2 <-> swp4, at 2.5G
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- eno3 <-> swp5, at 1G
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Only one of the above Ethernet port pairs can act as a DSA link for
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tagging.
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When adding initial support for the driver, it was tested only on the 1G
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eno3 <-> swp5 interface, due to the necessity of using PHYLIB initially
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(which treats fixed-link interfaces as emulated C22 PHYs, so it doesn't
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support fixed-link speeds higher than 1G).
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After making PHYLINK work, it appears that swp4 still can't act as CPU
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port. So it looks like ocelot_set_cpu_port was being called for swp4,
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but then it was called again for swp5, overwriting the CPU port assigned
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in the DT.
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It appears that when you call dsa_upstream_port for a port that is not
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defined in the device tree (such as swp5 when using swp4 as CPU port),
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its dp->cpu_dp pointer is not initialized by dsa_tree_setup_default_cpu,
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and this trips up the following condition in dsa_upstream_port:
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if (!cpu_dp)
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return port;
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So the moral of the story is: don't call dsa_upstream_port for a port
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that is not defined in the device tree, and therefore its dsa_port
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structure is not completely initialized (ds->num_ports is still 6).
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Fixes: 56051948773e ("net: dsa: ocelot: add driver for Felix switch family")
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/ocelot/felix.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/net/dsa/ocelot/felix.c
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+++ b/drivers/net/dsa/ocelot/felix.c
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@@ -286,7 +286,7 @@ static int felix_setup(struct dsa_switch
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for (port = 0; port < ds->num_ports; port++) {
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ocelot_init_port(ocelot, port);
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- if (port == dsa_upstream_port(ds, port))
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+ if (dsa_is_cpu_port(ds, port))
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ocelot_set_cpu_port(ocelot, port,
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OCELOT_TAG_PREFIX_NONE,
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OCELOT_TAG_PREFIX_LONG);
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