@@ -1513,6 +1513,12 @@ int ocelot_init(struct ocelot *ocelot)
if (!ocelot->stats_queue)
return -ENOMEM;
+ ocelot->owq = alloc_ordered_workqueue("ocelot-owq", 0);
+ if (!ocelot->owq) {
+ destroy_workqueue(ocelot->stats_queue);
+ return -ENOMEM;
+ }
+
INIT_LIST_HEAD(&ocelot->multicast);
INIT_LIST_HEAD(&ocelot->pgids);
ocelot_mact_init(ocelot);
@@ -1619,6 +1625,7 @@ void ocelot_deinit(struct ocelot *ocelot)
{
cancel_delayed_work(&ocelot->stats_work);
destroy_workqueue(ocelot->stats_queue);
+ destroy_workqueue(ocelot->owq);
mutex_destroy(&ocelot->stats_lock);
}
EXPORT_SYMBOL(ocelot_deinit);
@@ -414,13 +414,81 @@ static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
+enum ocelot_action_type {
+ OCELOT_MACT_LEARN,
+ OCELOT_MACT_FORGET,
+};
+
+struct ocelot_mact_work_ctx {
+ struct work_struct work;
+ struct ocelot *ocelot;
+ enum ocelot_action_type type;
+ union {
+ /* OCELOT_MACT_LEARN */
+ struct {
+ unsigned char addr[ETH_ALEN];
+ u16 vid;
+ enum macaccess_entry_type entry_type;
+ int pgid;
+ } learn;
+ /* OCELOT_MACT_FORGET */
+ struct {
+ unsigned char addr[ETH_ALEN];
+ u16 vid;
+ } forget;
+ };
+};
+
+#define ocelot_work_to_ctx(x) \
+ container_of((x), struct ocelot_mact_work_ctx, work)
+
+static void ocelot_mact_work(struct work_struct *work)
+{
+ struct ocelot_mact_work_ctx *w = ocelot_work_to_ctx(work);
+ struct ocelot *ocelot = w->ocelot;
+
+ switch (w->type) {
+ case OCELOT_MACT_LEARN:
+ ocelot_mact_learn(ocelot, w->learn.pgid, w->learn.addr,
+ w->learn.vid, w->learn.entry_type);
+ break;
+ case OCELOT_MACT_FORGET:
+ ocelot_mact_forget(ocelot, w->forget.addr, w->forget.vid);
+ break;
+ default:
+ break;
+ };
+
+ kfree(w);
+}
+
+static int ocelot_enqueue_mact_action(struct ocelot *ocelot,
+ const struct ocelot_mact_work_ctx *ctx)
+{
+ struct ocelot_mact_work_ctx *w = kmemdup(ctx, sizeof(*w), GFP_ATOMIC);
+
+ if (!w)
+ return -ENOMEM;
+
+ w->ocelot = ocelot;
+ INIT_WORK(&w->work, ocelot_mact_work);
+ queue_work(ocelot->owq, &w->work);
+
+ return 0;
+}
+
static int ocelot_mc_unsync(struct net_device *dev, const unsigned char *addr)
{
struct ocelot_port_private *priv = netdev_priv(dev);
struct ocelot_port *ocelot_port = &priv->port;
struct ocelot *ocelot = ocelot_port->ocelot;
+ struct ocelot_mact_work_ctx w;
+
+ ether_addr_copy(w.forget.addr, addr);
+ w.forget.vid = ocelot_port->pvid_vlan.vid;
+ w.type = OCELOT_MACT_FORGET;
- return ocelot_mact_forget(ocelot, addr, ocelot_port->pvid_vlan.vid);
+ return ocelot_enqueue_mact_action(ocelot, &w);
}
static int ocelot_mc_sync(struct net_device *dev, const unsigned char *addr)
@@ -428,9 +496,15 @@ static int ocelot_mc_sync(struct net_device *dev, const unsigned char *addr)
struct ocelot_port_private *priv = netdev_priv(dev);
struct ocelot_port *ocelot_port = &priv->port;
struct ocelot *ocelot = ocelot_port->ocelot;
+ struct ocelot_mact_work_ctx w;
+
+ ether_addr_copy(w.learn.addr, addr);
+ w.learn.vid = ocelot_port->pvid_vlan.vid;
+ w.learn.pgid = PGID_CPU;
+ w.learn.entry_type = ENTRYTYPE_LOCKED;
+ w.type = OCELOT_MACT_LEARN;
- return ocelot_mact_learn(ocelot, PGID_CPU, addr,
- ocelot_port->pvid_vlan.vid, ENTRYTYPE_LOCKED);
+ return ocelot_enqueue_mact_action(ocelot, &w);
}
static void ocelot_set_rx_mode(struct net_device *dev)
@@ -650,6 +650,8 @@ struct ocelot {
struct delayed_work stats_work;
struct workqueue_struct *stats_queue;
+ struct workqueue_struct *owq;
+
u8 ptp:1;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_info;
Currently ocelot_set_rx_mode calls ocelot_mact_learn directly, which has a very nice ocelot_mact_wait_for_completion at the end. Introduced in commit 639c1b2625af ("net: mscc: ocelot: Register poll timeout should be wall time not attempts"), this function uses readx_poll_timeout which triggers a lot of lockdep warnings and is also dangerous to use from atomic context, potentially leading to lockups and panics. Steen Hegelund added a poll timeout of 100 ms for checking the MAC table, a duration which is clearly absurd to poll in atomic context. So we need to defer the MAC table access to process context, which we do via a dynamically allocated workqueue which contains all there is to know about the MAC table operation it has to do. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> --- Changes in v4: - Dropped WQ_MEM_RECLAIM - Properly cleaning up on memory allocation error - Using kmemdup - Reordered members of struct ocelot_mact_work_ctx::learn Changes in v3: - Dropped Fixes tag and retargeted to net-next - Dropped get_device/put_device since they don't offer real protection - Now allocating a private ordered workqueue which is drained on unbind to avoid accessing freed memory Changes in v2: - Added Fixes tag (it won't backport that far, but anyway) - Using get_device and put_device to avoid racing with unbind drivers/net/ethernet/mscc/ocelot.c | 7 +++ drivers/net/ethernet/mscc/ocelot_net.c | 80 +++++++++++++++++++++++++- include/soc/mscc/ocelot.h | 2 + 3 files changed, 86 insertions(+), 3 deletions(-)