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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-10-20 20:49:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-21 14:44:06 +0300 |
| commit | d0004a020bb50263de0e3e775c7b7c7a003e0e0c (patch) | |
| tree | 03811eb15c15b4bec1430485f0a94b38535629e6 /net/dsa/dsa2.c | |
| parent | 82b318983c515f29b8b3a0dad9f6a5fe8a68a7f4 (diff) | |
| download | linux-d0004a020bb50263de0e3e775c7b7c7a003e0e0c.tar.xz | |
net: dsa: remove the "dsa_to_port in a loop" antipattern from the core
Ever since Vivien's conversion of the ds->ports array into a dst->ports
list, and the introduction of dsa_to_port, iterations through the ports
of a switch became quadratic whenever dsa_to_port was needed.
dsa_to_port can either be called directly, or indirectly through the
dsa_is_{user,cpu,dsa,unused}_port helpers.
Use the newly introduced dsa_switch_for_each_port() iteration macro
that works with the iterator variable being a struct dsa_port *dp
directly, and not an int i. It is an expensive variable to go from i to
dp, but cheap to go from dp to i.
This macro iterates through the entire ds->dst->ports list and filters
by the ports belonging just to the switch provided as argument.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa/dsa2.c')
| -rw-r--r-- | net/dsa/dsa2.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index 691d27498b24..1c09182b3644 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -802,17 +802,16 @@ static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds) { const struct dsa_device_ops *tag_ops = ds->dst->tag_ops; struct dsa_switch_tree *dst = ds->dst; - int port, err; + struct dsa_port *cpu_dp; + int err; if (tag_ops->proto == dst->default_proto) return 0; - for (port = 0; port < ds->num_ports; port++) { - if (!dsa_is_cpu_port(ds, port)) - continue; - + dsa_switch_for_each_cpu_port(cpu_dp, ds) { rtnl_lock(); - err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto); + err = ds->ops->change_tag_protocol(ds, cpu_dp->index, + tag_ops->proto); rtnl_unlock(); if (err) { dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n", @@ -1150,7 +1149,7 @@ int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, goto out_unlock; list_for_each_entry(dp, &dst->ports, list) { - if (!dsa_is_user_port(dp->ds, dp->index)) + if (!dsa_port_is_user(dp)) continue; if (dp->slave->flags & IFF_UP) |