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DSA performs non-trivial housekeeping of unicast and multicast addresses on shared (CPU and DSA) ports, and puts a bit of pressure on higher layers, requiring them to behave correctly (remove these addresses exactly as many times as they were added). Otherwise, either addresses linger around forever, or DSA returns -ENOENT complaining that entries that were already deleted must be deleted again. To aid debugging, introduce some trace points specifically for FDB and MDB - that's where some of the bugs still are right now. Some bugs I have seen were also due to race conditions, see: -630fd4822a("net: dsa: flush switchdev workqueue on bridge join error path") -a2614140dc("net: dsa: mv88e6xxx: flush switchdev FDB workqueue before removing VLAN") so it would be good to not disturb the timing too much, hence the choice to use trace points vs regular dev_dbg(). I've had these for some time on my computer in a less polished form, and they've proven useful. What I found most useful was to enable CONFIG_BOOTTIME_TRACING, add "trace_event=dsa" to the kernel cmdline, and run "cat /sys/kernel/debug/tracing/trace". This is to debug more complex environments with network managers started by the init system, things like that. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
40 lines
769 B
C
40 lines
769 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright 2022-2023 NXP
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*/
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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void dsa_db_print(const struct dsa_db *db, char buf[DSA_DB_BUFSIZ])
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{
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switch (db->type) {
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case DSA_DB_PORT:
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sprintf(buf, "port %s", db->dp->name);
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break;
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case DSA_DB_LAG:
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sprintf(buf, "lag %s id %d", db->lag.dev->name, db->lag.id);
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break;
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case DSA_DB_BRIDGE:
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sprintf(buf, "bridge %s num %d", db->bridge.dev->name,
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db->bridge.num);
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break;
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default:
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sprintf(buf, "unknown");
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break;
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}
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}
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const char *dsa_port_kind(const struct dsa_port *dp)
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{
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switch (dp->type) {
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case DSA_PORT_TYPE_USER:
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return "user";
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case DSA_PORT_TYPE_CPU:
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return "cpu";
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case DSA_PORT_TYPE_DSA:
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return "dsa";
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default:
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return "unused";
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}
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}
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