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Date: Wed, 30 Oct 2019 22:09:13 -0400
From: Vivien Didelot <vivien.didelot@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: linux-kernel@...r.kernel.org,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org
Subject: [PATCH net-next v2 1/7] net: dsa: list DSA links in the fabric
Implement a new list of DSA links in the switch fabric itself, to
provide an alterative to the ds->rtable static arrays.
At the same time, provide a new dsa_routing_port() helper to abstract
the usage of ds->rtable in drivers. If there's no port to reach a
given device, return the first invalid port, ds->num_ports. This avoids
potential signedness errors or the need to define special values.
Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
drivers/net/dsa/mv88e6xxx/chip.c | 8 +++----
include/net/dsa.h | 29 +++++++++++++++++++++-
net/dsa/dsa2.c | 41 +++++++++++++++++++++++++++++++-
3 files changed, 72 insertions(+), 6 deletions(-)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 619cd081339e..66de492117ad 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1143,6 +1143,7 @@ static int mv88e6xxx_pri_setup(struct mv88e6xxx_chip *chip)
static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
{
+ struct dsa_switch *ds = chip->ds;
int target, port;
int err;
@@ -1151,10 +1152,9 @@ static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
/* Initialize the routing port to the 32 possible target devices */
for (target = 0; target < 32; target++) {
- port = 0x1f;
- if (target < DSA_MAX_SWITCHES)
- if (chip->ds->rtable[target] != DSA_RTABLE_NONE)
- port = chip->ds->rtable[target];
+ port = dsa_routing_port(ds, target);
+ if (port == ds->num_ports)
+ port = 0x1f;
err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
if (err)
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 9aba326abb64..3d7366d634d8 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -123,6 +123,9 @@ struct dsa_switch_tree {
/* List of switch ports */
struct list_head ports;
+ /* List of DSA links composing the routing table */
+ struct list_head rtable;
+
/*
* Data for the individual switch chips.
*/
@@ -214,6 +217,17 @@ struct dsa_port {
bool setup;
};
+/* TODO: ideally DSA ports would have a single dp->link_dp member,
+ * and no dst->rtable nor this struct dsa_link would be needed,
+ * but this would require some more complex tree walking,
+ * so keep it stupid at the moment and list them all.
+ */
+struct dsa_link {
+ struct dsa_port *dp;
+ struct dsa_port *link_dp;
+ struct list_head list;
+};
+
struct dsa_switch {
bool setup;
@@ -324,6 +338,19 @@ static inline u32 dsa_user_ports(struct dsa_switch *ds)
return mask;
}
+/* Return the local port used to reach an arbitrary switch device */
+static inline unsigned int dsa_routing_port(struct dsa_switch *ds, int device)
+{
+ struct dsa_switch_tree *dst = ds->dst;
+ struct dsa_link *dl;
+
+ list_for_each_entry(dl, &dst->rtable, list)
+ if (dl->dp->ds == ds && dl->link_dp->ds->index == device)
+ return dl->dp->index;
+
+ return ds->num_ports;
+}
+
/* Return the local port used to reach an arbitrary switch port */
static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
int port)
@@ -331,7 +358,7 @@ static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
if (device == ds->index)
return port;
else
- return ds->rtable[device];
+ return dsa_routing_port(ds, device);
}
/* Return the local port used to reach the dedicated CPU port */
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index e7aae96b54bb..222d7dbfcfea 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -45,6 +45,8 @@ static struct dsa_switch_tree *dsa_tree_alloc(int index)
dst->index = index;
+ INIT_LIST_HEAD(&dst->rtable);
+
INIT_LIST_HEAD(&dst->ports);
INIT_LIST_HEAD(&dst->list);
@@ -122,6 +124,31 @@ static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
return NULL;
}
+struct dsa_link *dsa_link_touch(struct dsa_port *dp, struct dsa_port *link_dp)
+{
+ struct dsa_switch *ds = dp->ds;
+ struct dsa_switch_tree *dst;
+ struct dsa_link *dl;
+
+ dst = ds->dst;
+
+ list_for_each_entry(dl, &dst->rtable, list)
+ if (dl->dp == dp && dl->link_dp == link_dp)
+ return dl;
+
+ dl = kzalloc(sizeof(*dl), GFP_KERNEL);
+ if (!dl)
+ return NULL;
+
+ dl->dp = dp;
+ dl->link_dp = link_dp;
+
+ INIT_LIST_HEAD(&dl->list);
+ list_add_tail(&dl->list, &dst->rtable);
+
+ return dl;
+}
+
static bool dsa_port_setup_routing_table(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
@@ -129,6 +156,7 @@ static bool dsa_port_setup_routing_table(struct dsa_port *dp)
struct device_node *dn = dp->dn;
struct of_phandle_iterator it;
struct dsa_port *link_dp;
+ struct dsa_link *dl;
int err;
of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
@@ -138,7 +166,11 @@ static bool dsa_port_setup_routing_table(struct dsa_port *dp)
return false;
}
- ds->rtable[link_dp->ds->index] = dp->index;
+ dl = dsa_link_touch(dp, link_dp);
+ if (!dl) {
+ of_node_put(it.node);
+ return false;
+ }
}
return true;
@@ -544,6 +576,8 @@ static int dsa_tree_setup(struct dsa_switch_tree *dst)
static void dsa_tree_teardown(struct dsa_switch_tree *dst)
{
+ struct dsa_link *dl, *next;
+
if (!dst->setup)
return;
@@ -553,6 +587,11 @@ static void dsa_tree_teardown(struct dsa_switch_tree *dst)
dsa_tree_teardown_default_cpu(dst);
+ list_for_each_entry_safe(dl, next, &dst->rtable, list) {
+ list_del(&dl->list);
+ kfree(dl);
+ }
+
pr_info("DSA: tree %d torn down\n", dst->index);
dst->setup = false;
--
2.23.0
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