[PATCH net-next 0/9] mlxsw: Prepare SPAN API for upcoming changes

[PATCH net-next 0/9] mlxsw: Prepare SPAN API for upcoming changes

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

Switched port analyzer (SPAN) is used for packet mirroring. Over mlxsw
this is achieved by attaching tc-mirred action to either matchall or
flower classifier.

The current API used to configure SPAN consists of two functions:
mlxsw_sp_span_mirror_add() and mlxsw_sp_span_mirror_del().

These two functions pack a lot of different operations:

* SPAN agent configuration: Determining the egress port and optional
  headers that need to encapsulate the mirrored packet (when mirroring
  to a gretap, for example)

* Egress mirror buffer configuration: Allocating / freeing a buffer when
  port is analyzed (inspected) at egress

* SPAN agent binding: Binding the SPAN agent to a trigger, if any. The
  current triggers are incoming / outgoing packet and they are only used
  for matchall-based mirroring

This non-modular design makes it difficult to extend the API for future
changes, such as new mirror targets (CPU) and new global triggers (early
dropped packets, for example).

Therefore, this patch set gradually adds APIs for above mentioned
operations and then converts the two existing users to use it instead of
the old API. No functional changes intended. Tested with existing
mirroring selftests.

Patch set overview:

Patches #1-#5 gradually add the new API
Patches #6-#8 convert existing users to use the new API
Patch #9 removes the old API

Ido Schimmel (9):
  mlxsw: spectrum_span: Add APIs to get / put a SPAN agent
  mlxsw: spectrum_span: Add APIs to get / put an analyzed port
  mlxsw: spectrum_span: Rename function
  mlxsw: spectrum_span: Wrap buffer change in a function
  mlxsw: spectrum_span: Add APIs to bind / unbind a SPAN agent
  mlxsw: spectrum: Convert matchall-based mirroring to new SPAN API
  mlxsw: spectrum_acl: Convert flower-based mirroring to new SPAN API
  mlxsw: spectrum_span: Use new analyzed ports list during speed / MTU
    change
  mlxsw: spectrum_span: Remove old SPAN API

 .../mlxsw/spectrum_acl_flex_actions.c         |  31 +-
 .../mellanox/mlxsw/spectrum_matchall.c        |  52 +-
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 563 ++++++++++++------
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |  47 +-
 4 files changed, 449 insertions(+), 244 deletions(-)

-- 
2.24.1

[PATCH net-next 1/9] mlxsw: spectrum_span: Add APIs to get / put a SPAN agent

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

Given a netdev that packets should be mirrored to, create a SPAN agent
and return its identifier to the caller.

The SPAN agent is reference counted, as multiple tc-mirred actions can
point to the same destination netdev.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 43 +++++++++++++++++++
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |  4 ++
 2 files changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index ae3c8a1e9a43..c4159f4a66e2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -1039,3 +1039,46 @@ void mlxsw_sp_span_respin(struct mlxsw_sp *mlxsw_sp)
 		return;
 	mlxsw_core_schedule_work(&mlxsw_sp->span->work);
 }
+
+int mlxsw_sp_span_agent_get(struct mlxsw_sp *mlxsw_sp,
+			    const struct net_device *to_dev, int *p_span_id)
+{
+	const struct mlxsw_sp_span_entry_ops *ops;
+	struct mlxsw_sp_span_entry *span_entry;
+	struct mlxsw_sp_span_parms sparms;
+	int err;
+
+	ASSERT_RTNL();
+
+	ops = mlxsw_sp_span_entry_ops(mlxsw_sp, to_dev);
+	if (!ops) {
+		dev_err(mlxsw_sp->bus_info->dev, "Cannot mirror to requested destination\n");
+		return -EOPNOTSUPP;
+	}
+
+	memset(&sparms, 0, sizeof(sparms));
+	err = ops->parms_set(to_dev, &sparms);
+	if (err)
+		return err;
+
+	span_entry = mlxsw_sp_span_entry_get(mlxsw_sp, to_dev, ops, sparms);
+	if (!span_entry)
+		return -ENOBUFS;
+
+	*p_span_id = span_entry->id;
+
+	return 0;
+}
+
+void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id)
+{
+	struct mlxsw_sp_span_entry *span_entry;
+
+	ASSERT_RTNL();
+
+	span_entry = mlxsw_sp_span_entry_find_by_id(mlxsw_sp, span_id);
+	if (WARN_ON_ONCE(!span_entry))
+		return;
+
+	mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
+}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
index d23abdf957fa..b79de9a125bb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
@@ -77,4 +77,8 @@ void mlxsw_sp_span_entry_invalidate(struct mlxsw_sp *mlxsw_sp,
 int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu);
 void mlxsw_sp_span_speed_update_work(struct work_struct *work);
 
+int mlxsw_sp_span_agent_get(struct mlxsw_sp *mlxsw_sp,
+			    const struct net_device *to_dev, int *p_span_id);
+void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id);
+
 #endif
-- 
2.24.1

[PATCH net-next 2/9] mlxsw: spectrum_span: Add APIs to get / put an analyzed port

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

An analyzed port is a port whose incoming / outgoing traffic is mirrored
to a SPAN agent and analyzed on a remote server.

A port can be analyzed by multiple tc filters and therefore the
corresponding analyzed port entry needs to be reference counted. This is
significant because ports whose outgoing traffic is analyzed need to
have an egress mirror buffer.

Add APIs to get / put an analyzed port. Allocate an egress mirror buffer
on a port when it is first inspected at egress and free the buffer when
it is no longer inspected at egress.

Protect the list of analyzed ports with a mutex, as a later patch will
traverse it from a context in which RTNL lock is not held.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 136 ++++++++++++++++++
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |   4 +
 2 files changed, 140 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index c4159f4a66e2..5edf9d1bf937 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -3,6 +3,7 @@
 
 #include <linux/if_bridge.h>
 #include <linux/list.h>
+#include <linux/mutex.h>
 #include <linux/refcount.h>
 #include <linux/rtnetlink.h>
 #include <linux/workqueue.h>
@@ -20,11 +21,20 @@
 struct mlxsw_sp_span {
 	struct work_struct work;
 	struct mlxsw_sp *mlxsw_sp;
+	struct list_head analyzed_ports_list;
+	struct mutex analyzed_ports_lock; /* Protects analyzed_ports_list */
 	atomic_t active_entries_count;
 	int entries_count;
 	struct mlxsw_sp_span_entry entries[];
 };
 
+struct mlxsw_sp_span_analyzed_port {
+	struct list_head list; /* Member of analyzed_ports_list */
+	refcount_t ref_count;
+	u8 local_port;
+	bool ingress;
+};
+
 static void mlxsw_sp_span_respin_work(struct work_struct *work);
 
 static u64 mlxsw_sp_span_occ_get(void *priv)
@@ -49,6 +59,8 @@ int mlxsw_sp_span_init(struct mlxsw_sp *mlxsw_sp)
 		return -ENOMEM;
 	span->entries_count = entries_count;
 	atomic_set(&span->active_entries_count, 0);
+	mutex_init(&span->analyzed_ports_lock);
+	INIT_LIST_HEAD(&span->analyzed_ports_list);
 	span->mlxsw_sp = mlxsw_sp;
 	mlxsw_sp->span = span;
 
@@ -79,6 +91,8 @@ void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp)
 
 		WARN_ON_ONCE(!list_empty(&curr->bound_ports_list));
 	}
+	WARN_ON_ONCE(!list_empty(&mlxsw_sp->span->analyzed_ports_list));
+	mutex_destroy(&mlxsw_sp->span->analyzed_ports_lock);
 	kfree(mlxsw_sp->span);
 }
 
@@ -1082,3 +1096,125 @@ void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id)
 
 	mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
 }
+
+static struct mlxsw_sp_span_analyzed_port *
+mlxsw_sp_span_analyzed_port_find(struct mlxsw_sp_span *span, u8 local_port,
+				 bool ingress)
+{
+	struct mlxsw_sp_span_analyzed_port *analyzed_port;
+
+	list_for_each_entry(analyzed_port, &span->analyzed_ports_list, list) {
+		if (analyzed_port->local_port == local_port &&
+		    analyzed_port->ingress == ingress)
+			return analyzed_port;
+	}
+
+	return NULL;
+}
+
+static struct mlxsw_sp_span_analyzed_port *
+mlxsw_sp_span_analyzed_port_create(struct mlxsw_sp_span *span,
+				   struct mlxsw_sp_port *mlxsw_sp_port,
+				   bool ingress)
+{
+	struct mlxsw_sp_span_analyzed_port *analyzed_port;
+	int err;
+
+	analyzed_port = kzalloc(sizeof(*analyzed_port), GFP_KERNEL);
+	if (!analyzed_port)
+		return ERR_PTR(-ENOMEM);
+
+	refcount_set(&analyzed_port->ref_count, 1);
+	analyzed_port->local_port = mlxsw_sp_port->local_port;
+	analyzed_port->ingress = ingress;
+	list_add_tail(&analyzed_port->list, &span->analyzed_ports_list);
+
+	/* An egress mirror buffer should be allocated on the egress port which
+	 * does the mirroring.
+	 */
+	if (!ingress) {
+		u16 mtu = mlxsw_sp_port->dev->mtu;
+
+		err = mlxsw_sp_span_port_buffsize_update(mlxsw_sp_port, mtu);
+		if (err)
+			goto err_buffsize_update;
+	}
+
+	return analyzed_port;
+
+err_buffsize_update:
+	list_del(&analyzed_port->list);
+	kfree(analyzed_port);
+	return ERR_PTR(err);
+}
+
+static void
+mlxsw_sp_span_analyzed_port_destroy(struct mlxsw_sp_span *span,
+				    struct mlxsw_sp_span_analyzed_port *
+				    analyzed_port)
+{
+	struct mlxsw_sp *mlxsw_sp = span->mlxsw_sp;
+	char sbib_pl[MLXSW_REG_SBIB_LEN];
+
+	/* Remove egress mirror buffer now that port is no longer analyzed
+	 * at egress.
+	 */
+	if (!analyzed_port->ingress) {
+		mlxsw_reg_sbib_pack(sbib_pl, analyzed_port->local_port, 0);
+		mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
+	}
+
+	list_del(&analyzed_port->list);
+	kfree(analyzed_port);
+}
+
+int mlxsw_sp_span_analyzed_port_get(struct mlxsw_sp_port *mlxsw_sp_port,
+				    bool ingress)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_span_analyzed_port *analyzed_port;
+	u8 local_port = mlxsw_sp_port->local_port;
+	int err = 0;
+
+	mutex_lock(&mlxsw_sp->span->analyzed_ports_lock);
+
+	analyzed_port = mlxsw_sp_span_analyzed_port_find(mlxsw_sp->span,
+							 local_port, ingress);
+	if (analyzed_port) {
+		refcount_inc(&analyzed_port->ref_count);
+		goto out_unlock;
+	}
+
+	analyzed_port = mlxsw_sp_span_analyzed_port_create(mlxsw_sp->span,
+							   mlxsw_sp_port,
+							   ingress);
+	if (IS_ERR(analyzed_port))
+		err = PTR_ERR(analyzed_port);
+
+out_unlock:
+	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
+	return err;
+}
+
+void mlxsw_sp_span_analyzed_port_put(struct mlxsw_sp_port *mlxsw_sp_port,
+				     bool ingress)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_span_analyzed_port *analyzed_port;
+	u8 local_port = mlxsw_sp_port->local_port;
+
+	mutex_lock(&mlxsw_sp->span->analyzed_ports_lock);
+
+	analyzed_port = mlxsw_sp_span_analyzed_port_find(mlxsw_sp->span,
+							 local_port, ingress);
+	if (WARN_ON_ONCE(!analyzed_port))
+		goto out_unlock;
+
+	if (!refcount_dec_and_test(&analyzed_port->ref_count))
+		goto out_unlock;
+
+	mlxsw_sp_span_analyzed_port_destroy(mlxsw_sp->span, analyzed_port);
+
+out_unlock:
+	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
+}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
index b79de9a125bb..1345eda5cc34 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
@@ -80,5 +80,9 @@ void mlxsw_sp_span_speed_update_work(struct work_struct *work);
 int mlxsw_sp_span_agent_get(struct mlxsw_sp *mlxsw_sp,
 			    const struct net_device *to_dev, int *p_span_id);
 void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id);
+int mlxsw_sp_span_analyzed_port_get(struct mlxsw_sp_port *mlxsw_sp_port,
+				    bool ingress);
+void mlxsw_sp_span_analyzed_port_put(struct mlxsw_sp_port *mlxsw_sp_port,
+				     bool ingress);
 
 #endif
-- 
2.24.1

[PATCH net-next 3/9] mlxsw: spectrum_span: Rename function

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

Next patch will introduce mlxsw_sp_span_port_buffer_disable() function
that disables the egress buffer on an analyzed port. Rename the opposite
function that updates the buffer on an analyzed port accordingly.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Suggested-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_span.c  | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 5edf9d1bf937..c52f79a97f36 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -784,7 +784,7 @@ static bool mlxsw_sp_span_is_egress_mirror(struct mlxsw_sp_port *port)
 }
 
 static int
-mlxsw_sp_span_port_buffsize_update(struct mlxsw_sp_port *mlxsw_sp_port, u16 mtu)
+mlxsw_sp_span_port_buffer_update(struct mlxsw_sp_port *mlxsw_sp_port, u16 mtu)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 	char sbib_pl[MLXSW_REG_SBIB_LEN];
@@ -809,7 +809,7 @@ int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu)
 	 * updated according to the mtu value
 	 */
 	if (mlxsw_sp_span_is_egress_mirror(port))
-		return mlxsw_sp_span_port_buffsize_update(port, mtu);
+		return mlxsw_sp_span_port_buffer_update(port, mtu);
 	return 0;
 }
 
@@ -825,8 +825,8 @@ void mlxsw_sp_span_speed_update_work(struct work_struct *work)
 	 * updated according to the speed value.
 	 */
 	if (mlxsw_sp_span_is_egress_mirror(mlxsw_sp_port))
-		mlxsw_sp_span_port_buffsize_update(mlxsw_sp_port,
-						   mlxsw_sp_port->dev->mtu);
+		mlxsw_sp_span_port_buffer_update(mlxsw_sp_port,
+						 mlxsw_sp_port->dev->mtu);
 }
 
 static struct mlxsw_sp_span_inspected_port *
@@ -888,7 +888,7 @@ mlxsw_sp_span_inspected_port_add(struct mlxsw_sp_port *port,
 
 	/* if it is an egress SPAN, bind a shared buffer to it */
 	if (type == MLXSW_SP_SPAN_EGRESS) {
-		err = mlxsw_sp_span_port_buffsize_update(port, port->dev->mtu);
+		err = mlxsw_sp_span_port_buffer_update(port, port->dev->mtu);
 		if (err)
 			return err;
 	}
@@ -1135,14 +1135,14 @@ mlxsw_sp_span_analyzed_port_create(struct mlxsw_sp_span *span,
 	if (!ingress) {
 		u16 mtu = mlxsw_sp_port->dev->mtu;
 
-		err = mlxsw_sp_span_port_buffsize_update(mlxsw_sp_port, mtu);
+		err = mlxsw_sp_span_port_buffer_update(mlxsw_sp_port, mtu);
 		if (err)
-			goto err_buffsize_update;
+			goto err_buffer_update;
 	}
 
 	return analyzed_port;
 
-err_buffsize_update:
+err_buffer_update:
 	list_del(&analyzed_port->list);
 	kfree(analyzed_port);
 	return ERR_PTR(err);
-- 
2.24.1

[PATCH net-next 4/9] mlxsw: spectrum_span: Wrap buffer change in a function

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

The code that adjusts the egress buffer size is not symmetric at the
moment. The update is done via a call to
mlxsw_sp_span_port_buffer_update(), but the disablement is done inline
by invoking the write to SBIB register directly.

Wrap the disablement code in mlxsw_sp_span_port_buffer_disable().

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Suggested-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_span.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index c52f79a97f36..2b9d8ce93b13 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -803,6 +803,15 @@ mlxsw_sp_span_port_buffer_update(struct mlxsw_sp_port *mlxsw_sp_port, u16 mtu)
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
 }
 
+static void mlxsw_sp_span_port_buffer_disable(struct mlxsw_sp *mlxsw_sp,
+					      u8 local_port)
+{
+	char sbib_pl[MLXSW_REG_SBIB_LEN];
+
+	mlxsw_reg_sbib_pack(sbib_pl, local_port, 0);
+	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
+}
+
 int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu)
 {
 	/* If port is egress mirrored, the shared buffer size should be
@@ -1154,15 +1163,13 @@ mlxsw_sp_span_analyzed_port_destroy(struct mlxsw_sp_span *span,
 				    analyzed_port)
 {
 	struct mlxsw_sp *mlxsw_sp = span->mlxsw_sp;
-	char sbib_pl[MLXSW_REG_SBIB_LEN];
 
 	/* Remove egress mirror buffer now that port is no longer analyzed
 	 * at egress.
 	 */
-	if (!analyzed_port->ingress) {
-		mlxsw_reg_sbib_pack(sbib_pl, analyzed_port->local_port, 0);
-		mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
-	}
+	if (!analyzed_port->ingress)
+		mlxsw_sp_span_port_buffer_disable(mlxsw_sp,
+						  analyzed_port->local_port);
 
 	list_del(&analyzed_port->list);
 	kfree(analyzed_port);
-- 
2.24.1

[PATCH net-next 5/9] mlxsw: spectrum_span: Add APIs to bind / unbind a SPAN agent

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

Currently, a SPAN agent can only be bound to a per-port trigger where
the trigger is either an incoming packet (INGRESS) or an outgoing packet
(EGRESS) to / from the port.

A follow-up patch set will introduce the concept of global triggers and
per-{port, TC} enablement. With global triggers, the trigger entry is
only keyed by a trigger and not by a port and a trigger. The trigger can
be, for example, a packet that was early dropped.

While the binding between the SPAN agent and the trigger is performed
only once, the trigger entry needs to be reference counted, as the
trigger can be enabled on multiple ports.

Add APIs to bind / unbind a SPAN agent to a trigger and reference count
the trigger entry in preparation for global triggers.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 169 ++++++++++++++++++
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |  18 ++
 2 files changed, 187 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 2b9d8ce93b13..de9012ab94d5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -23,6 +23,7 @@ struct mlxsw_sp_span {
 	struct mlxsw_sp *mlxsw_sp;
 	struct list_head analyzed_ports_list;
 	struct mutex analyzed_ports_lock; /* Protects analyzed_ports_list */
+	struct list_head trigger_entries_list;
 	atomic_t active_entries_count;
 	int entries_count;
 	struct mlxsw_sp_span_entry entries[];
@@ -35,6 +36,14 @@ struct mlxsw_sp_span_analyzed_port {
 	bool ingress;
 };
 
+struct mlxsw_sp_span_trigger_entry {
+	struct list_head list; /* Member of trigger_entries_list */
+	refcount_t ref_count;
+	u8 local_port;
+	enum mlxsw_sp_span_trigger trigger;
+	struct mlxsw_sp_span_trigger_parms parms;
+};
+
 static void mlxsw_sp_span_respin_work(struct work_struct *work);
 
 static u64 mlxsw_sp_span_occ_get(void *priv)
@@ -61,6 +70,7 @@ int mlxsw_sp_span_init(struct mlxsw_sp *mlxsw_sp)
 	atomic_set(&span->active_entries_count, 0);
 	mutex_init(&span->analyzed_ports_lock);
 	INIT_LIST_HEAD(&span->analyzed_ports_list);
+	INIT_LIST_HEAD(&span->trigger_entries_list);
 	span->mlxsw_sp = mlxsw_sp;
 	mlxsw_sp->span = span;
 
@@ -91,6 +101,7 @@ void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp)
 
 		WARN_ON_ONCE(!list_empty(&curr->bound_ports_list));
 	}
+	WARN_ON_ONCE(!list_empty(&mlxsw_sp->span->trigger_entries_list));
 	WARN_ON_ONCE(!list_empty(&mlxsw_sp->span->analyzed_ports_list));
 	mutex_destroy(&mlxsw_sp->span->analyzed_ports_lock);
 	kfree(mlxsw_sp->span);
@@ -1225,3 +1236,161 @@ void mlxsw_sp_span_analyzed_port_put(struct mlxsw_sp_port *mlxsw_sp_port,
 out_unlock:
 	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
 }
+
+static int
+__mlxsw_sp_span_trigger_entry_bind(struct mlxsw_sp_span *span,
+				   struct mlxsw_sp_span_trigger_entry *
+				   trigger_entry, bool enable)
+{
+	char mpar_pl[MLXSW_REG_MPAR_LEN];
+	enum mlxsw_reg_mpar_i_e i_e;
+
+	switch (trigger_entry->trigger) {
+	case MLXSW_SP_SPAN_TRIGGER_INGRESS:
+		i_e = MLXSW_REG_MPAR_TYPE_INGRESS;
+		break;
+	case MLXSW_SP_SPAN_TRIGGER_EGRESS:
+		i_e = MLXSW_REG_MPAR_TYPE_EGRESS;
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		return -EINVAL;
+	}
+
+	mlxsw_reg_mpar_pack(mpar_pl, trigger_entry->local_port, i_e, enable,
+			    trigger_entry->parms.span_id);
+	return mlxsw_reg_write(span->mlxsw_sp->core, MLXSW_REG(mpar), mpar_pl);
+}
+
+static int
+mlxsw_sp_span_trigger_entry_bind(struct mlxsw_sp_span *span,
+				 struct mlxsw_sp_span_trigger_entry *
+				 trigger_entry)
+{
+	return __mlxsw_sp_span_trigger_entry_bind(span, trigger_entry, true);
+}
+
+static void
+mlxsw_sp_span_trigger_entry_unbind(struct mlxsw_sp_span *span,
+				   struct mlxsw_sp_span_trigger_entry *
+				   trigger_entry)
+{
+	__mlxsw_sp_span_trigger_entry_bind(span, trigger_entry, false);
+}
+
+static struct mlxsw_sp_span_trigger_entry *
+mlxsw_sp_span_trigger_entry_create(struct mlxsw_sp_span *span,
+				   enum mlxsw_sp_span_trigger trigger,
+				   struct mlxsw_sp_port *mlxsw_sp_port,
+				   const struct mlxsw_sp_span_trigger_parms
+				   *parms)
+{
+	struct mlxsw_sp_span_trigger_entry *trigger_entry;
+	int err;
+
+	trigger_entry = kzalloc(sizeof(*trigger_entry), GFP_KERNEL);
+	if (!trigger_entry)
+		return ERR_PTR(-ENOMEM);
+
+	refcount_set(&trigger_entry->ref_count, 1);
+	trigger_entry->local_port = mlxsw_sp_port->local_port;
+	trigger_entry->trigger = trigger;
+	memcpy(&trigger_entry->parms, parms, sizeof(trigger_entry->parms));
+	list_add_tail(&trigger_entry->list, &span->trigger_entries_list);
+
+	err = mlxsw_sp_span_trigger_entry_bind(span, trigger_entry);
+	if (err)
+		goto err_trigger_entry_bind;
+
+	return trigger_entry;
+
+err_trigger_entry_bind:
+	list_del(&trigger_entry->list);
+	kfree(trigger_entry);
+	return ERR_PTR(err);
+}
+
+static void
+mlxsw_sp_span_trigger_entry_destroy(struct mlxsw_sp_span *span,
+				    struct mlxsw_sp_span_trigger_entry *
+				    trigger_entry)
+{
+	mlxsw_sp_span_trigger_entry_unbind(span, trigger_entry);
+	list_del(&trigger_entry->list);
+	kfree(trigger_entry);
+}
+
+static struct mlxsw_sp_span_trigger_entry *
+mlxsw_sp_span_trigger_entry_find(struct mlxsw_sp_span *span,
+				 enum mlxsw_sp_span_trigger trigger,
+				 struct mlxsw_sp_port *mlxsw_sp_port)
+{
+	struct mlxsw_sp_span_trigger_entry *trigger_entry;
+
+	list_for_each_entry(trigger_entry, &span->trigger_entries_list, list) {
+		if (trigger_entry->trigger == trigger &&
+		    trigger_entry->local_port == mlxsw_sp_port->local_port)
+			return trigger_entry;
+	}
+
+	return NULL;
+}
+
+int mlxsw_sp_span_agent_bind(struct mlxsw_sp *mlxsw_sp,
+			     enum mlxsw_sp_span_trigger trigger,
+			     struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct mlxsw_sp_span_trigger_parms *parms)
+{
+	struct mlxsw_sp_span_trigger_entry *trigger_entry;
+	int err = 0;
+
+	ASSERT_RTNL();
+
+	if (!mlxsw_sp_span_entry_find_by_id(mlxsw_sp, parms->span_id))
+		return -EINVAL;
+
+	trigger_entry = mlxsw_sp_span_trigger_entry_find(mlxsw_sp->span,
+							 trigger,
+							 mlxsw_sp_port);
+	if (trigger_entry) {
+		if (trigger_entry->parms.span_id != parms->span_id)
+			return -EINVAL;
+		refcount_inc(&trigger_entry->ref_count);
+		goto out;
+	}
+
+	trigger_entry = mlxsw_sp_span_trigger_entry_create(mlxsw_sp->span,
+							   trigger,
+							   mlxsw_sp_port,
+							   parms);
+	if (IS_ERR(trigger_entry))
+		err = PTR_ERR(trigger_entry);
+
+out:
+	return err;
+}
+
+void mlxsw_sp_span_agent_unbind(struct mlxsw_sp *mlxsw_sp,
+				enum mlxsw_sp_span_trigger trigger,
+				struct mlxsw_sp_port *mlxsw_sp_port,
+				const struct mlxsw_sp_span_trigger_parms *parms)
+{
+	struct mlxsw_sp_span_trigger_entry *trigger_entry;
+
+	ASSERT_RTNL();
+
+	if (WARN_ON_ONCE(!mlxsw_sp_span_entry_find_by_id(mlxsw_sp,
+							 parms->span_id)))
+		return;
+
+	trigger_entry = mlxsw_sp_span_trigger_entry_find(mlxsw_sp->span,
+							 trigger,
+							 mlxsw_sp_port);
+	if (WARN_ON_ONCE(!trigger_entry))
+		return;
+
+	if (!refcount_dec_and_test(&trigger_entry->ref_count))
+		return;
+
+	mlxsw_sp_span_trigger_entry_destroy(mlxsw_sp->span, trigger_entry);
+}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
index 1345eda5cc34..6821eeb3906b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
@@ -37,6 +37,15 @@ struct mlxsw_sp_span_parms {
 	u16 vid;
 };
 
+enum mlxsw_sp_span_trigger {
+	MLXSW_SP_SPAN_TRIGGER_INGRESS,
+	MLXSW_SP_SPAN_TRIGGER_EGRESS,
+};
+
+struct mlxsw_sp_span_trigger_parms {
+	int span_id;
+};
+
 struct mlxsw_sp_span_entry_ops;
 
 struct mlxsw_sp_span_entry {
@@ -84,5 +93,14 @@ int mlxsw_sp_span_analyzed_port_get(struct mlxsw_sp_port *mlxsw_sp_port,
 				    bool ingress);
 void mlxsw_sp_span_analyzed_port_put(struct mlxsw_sp_port *mlxsw_sp_port,
 				     bool ingress);
+int mlxsw_sp_span_agent_bind(struct mlxsw_sp *mlxsw_sp,
+			     enum mlxsw_sp_span_trigger trigger,
+			     struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct mlxsw_sp_span_trigger_parms *parms);
+void
+mlxsw_sp_span_agent_unbind(struct mlxsw_sp *mlxsw_sp,
+			   enum mlxsw_sp_span_trigger trigger,
+			   struct mlxsw_sp_port *mlxsw_sp_port,
+			   const struct mlxsw_sp_span_trigger_parms *parms);
 
 #endif
-- 
2.24.1

[PATCH net-next 6/9] mlxsw: spectrum: Convert matchall-based mirroring to new SPAN API

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

In matchall-based mirroring, mirroring is not done with ACLs, but a SPAN
agent is bound to the ingress / egress of a port and all incoming /
outgoing traffic is mirrored.

Convert this type of mirroring to use the new API.

First the SPAN agent is resolved, then the port is marked as analyzed
and its egress mirror buffer is potentially allocated. Lastly, the
binding is performed.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../mellanox/mlxsw/spectrum_matchall.c        | 52 ++++++++++++++-----
 1 file changed, 39 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_matchall.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_matchall.c
index 889da63072be..da1c05f44cec 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_matchall.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_matchall.c
@@ -48,31 +48,57 @@ static int
 mlxsw_sp_mall_port_mirror_add(struct mlxsw_sp_port *mlxsw_sp_port,
 			      struct mlxsw_sp_mall_entry *mall_entry)
 {
-	enum mlxsw_sp_span_type span_type;
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_span_trigger_parms parms;
+	enum mlxsw_sp_span_trigger trigger;
+	int err;
 
 	if (!mall_entry->mirror.to_dev) {
 		netdev_err(mlxsw_sp_port->dev, "Could not find requested device\n");
 		return -EINVAL;
 	}
 
-	span_type = mall_entry->ingress ? MLXSW_SP_SPAN_INGRESS :
-					  MLXSW_SP_SPAN_EGRESS;
-	return mlxsw_sp_span_mirror_add(mlxsw_sp_port,
-					mall_entry->mirror.to_dev,
-					span_type, true,
-					&mall_entry->mirror.span_id);
+	err = mlxsw_sp_span_agent_get(mlxsw_sp, mall_entry->mirror.to_dev,
+				      &mall_entry->mirror.span_id);
+	if (err)
+		return err;
+
+	err = mlxsw_sp_span_analyzed_port_get(mlxsw_sp_port,
+					      mall_entry->ingress);
+	if (err)
+		goto err_analyzed_port_get;
+
+	trigger = mall_entry->ingress ? MLXSW_SP_SPAN_TRIGGER_INGRESS :
+					MLXSW_SP_SPAN_TRIGGER_EGRESS;
+	parms.span_id = mall_entry->mirror.span_id;
+	err = mlxsw_sp_span_agent_bind(mlxsw_sp, trigger, mlxsw_sp_port,
+				       &parms);
+	if (err)
+		goto err_agent_bind;
+
+	return 0;
+
+err_agent_bind:
+	mlxsw_sp_span_analyzed_port_put(mlxsw_sp_port, mall_entry->ingress);
+err_analyzed_port_get:
+	mlxsw_sp_span_agent_put(mlxsw_sp, mall_entry->mirror.span_id);
+	return err;
 }
 
 static void
 mlxsw_sp_mall_port_mirror_del(struct mlxsw_sp_port *mlxsw_sp_port,
 			      struct mlxsw_sp_mall_entry *mall_entry)
 {
-	enum mlxsw_sp_span_type span_type;
-
-	span_type = mall_entry->ingress ? MLXSW_SP_SPAN_INGRESS :
-					  MLXSW_SP_SPAN_EGRESS;
-	mlxsw_sp_span_mirror_del(mlxsw_sp_port, mall_entry->mirror.span_id,
-				 span_type, true);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_span_trigger_parms parms;
+	enum mlxsw_sp_span_trigger trigger;
+
+	trigger = mall_entry->ingress ? MLXSW_SP_SPAN_TRIGGER_INGRESS :
+					MLXSW_SP_SPAN_TRIGGER_EGRESS;
+	parms.span_id = mall_entry->mirror.span_id;
+	mlxsw_sp_span_agent_unbind(mlxsw_sp, trigger, mlxsw_sp_port, &parms);
+	mlxsw_sp_span_analyzed_port_put(mlxsw_sp_port, mall_entry->ingress);
+	mlxsw_sp_span_agent_put(mlxsw_sp, mall_entry->mirror.span_id);
 }
 
 static int mlxsw_sp_mall_port_sample_set(struct mlxsw_sp_port *mlxsw_sp_port,
-- 
2.24.1

[PATCH net-next 7/9] mlxsw: spectrum_acl: Convert flower-based mirroring to new SPAN API

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

In flower-based mirroring, mirroring is done with ACLs and the SPAN
agent is not bound to a port. Instead its identifier is specified in an
ACL action.

Convert this type of mirroring to use the new API.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../mlxsw/spectrum_acl_flex_actions.c         | 31 ++++++++++++-------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c
index e47d1d286e93..73d56012654b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_flex_actions.c
@@ -136,28 +136,35 @@ mlxsw_sp_act_mirror_add(void *priv, u8 local_in_port,
 			const struct net_device *out_dev,
 			bool ingress, int *p_span_id)
 {
-	struct mlxsw_sp_port *in_port;
+	struct mlxsw_sp_port *mlxsw_sp_port;
 	struct mlxsw_sp *mlxsw_sp = priv;
-	enum mlxsw_sp_span_type type;
+	int err;
 
-	type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
-	in_port = mlxsw_sp->ports[local_in_port];
+	err = mlxsw_sp_span_agent_get(mlxsw_sp, out_dev, p_span_id);
+	if (err)
+		return err;
+
+	mlxsw_sp_port = mlxsw_sp->ports[local_in_port];
+	err = mlxsw_sp_span_analyzed_port_get(mlxsw_sp_port, ingress);
+	if (err)
+		goto err_analyzed_port_get;
 
-	return mlxsw_sp_span_mirror_add(in_port, out_dev, type,
-					false, p_span_id);
+	return 0;
+
+err_analyzed_port_get:
+	mlxsw_sp_span_agent_put(mlxsw_sp, *p_span_id);
+	return err;
 }
 
 static void
 mlxsw_sp_act_mirror_del(void *priv, u8 local_in_port, int span_id, bool ingress)
 {
+	struct mlxsw_sp_port *mlxsw_sp_port;
 	struct mlxsw_sp *mlxsw_sp = priv;
-	struct mlxsw_sp_port *in_port;
-	enum mlxsw_sp_span_type type;
-
-	type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
-	in_port = mlxsw_sp->ports[local_in_port];
 
-	mlxsw_sp_span_mirror_del(in_port, span_id, type, false);
+	mlxsw_sp_port = mlxsw_sp->ports[local_in_port];
+	mlxsw_sp_span_analyzed_port_put(mlxsw_sp_port, ingress);
+	mlxsw_sp_span_agent_put(mlxsw_sp, span_id);
 }
 
 const struct mlxsw_afa_ops mlxsw_sp1_act_afa_ops = {
-- 
2.24.1

[PATCH net-next 8/9] mlxsw: spectrum_span: Use new analyzed ports list during speed / MTU change

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

As previously explained, each port whose outgoing traffic is analyzed
needs to have an egress mirror buffer.

The size of the egress mirror buffer is calculated based on various
parameters, two of which are the speed and the MTU of the port.

Therefore, when the MTU or the speed of a port change, the SPAN code is
called to see if the egress mirror buffer of the port needs to be
adjusted.

Currently, this is done by traversing all the SPAN agents and for each
SPAN agent the list of bound ports is traversed.

Instead of the above, traverse the recently added list of analyzed
ports.

This will later allow us to remove the old SPAN API.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 72 +++++++++----------
 1 file changed, 35 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index de9012ab94d5..9cb8b509b849 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -776,24 +776,6 @@ static int mlxsw_sp_span_entry_put(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
-static bool mlxsw_sp_span_is_egress_mirror(struct mlxsw_sp_port *port)
-{
-	struct mlxsw_sp *mlxsw_sp = port->mlxsw_sp;
-	struct mlxsw_sp_span_inspected_port *p;
-	int i;
-
-	for (i = 0; i < mlxsw_sp->span->entries_count; i++) {
-		struct mlxsw_sp_span_entry *curr = &mlxsw_sp->span->entries[i];
-
-		list_for_each_entry(p, &curr->bound_ports_list, list)
-			if (p->local_port == port->local_port &&
-			    p->type == MLXSW_SP_SPAN_EGRESS)
-				return true;
-	}
-
-	return false;
-}
-
 static int
 mlxsw_sp_span_port_buffer_update(struct mlxsw_sp_port *mlxsw_sp_port, u16 mtu)
 {
@@ -823,20 +805,45 @@ static void mlxsw_sp_span_port_buffer_disable(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
 }
 
+static struct mlxsw_sp_span_analyzed_port *
+mlxsw_sp_span_analyzed_port_find(struct mlxsw_sp_span *span, u8 local_port,
+				 bool ingress)
+{
+	struct mlxsw_sp_span_analyzed_port *analyzed_port;
+
+	list_for_each_entry(analyzed_port, &span->analyzed_ports_list, list) {
+		if (analyzed_port->local_port == local_port &&
+		    analyzed_port->ingress == ingress)
+			return analyzed_port;
+	}
+
+	return NULL;
+}
+
 int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu)
 {
+	struct mlxsw_sp *mlxsw_sp = port->mlxsw_sp;
+	int err = 0;
+
 	/* If port is egress mirrored, the shared buffer size should be
 	 * updated according to the mtu value
 	 */
-	if (mlxsw_sp_span_is_egress_mirror(port))
-		return mlxsw_sp_span_port_buffer_update(port, mtu);
-	return 0;
+	mutex_lock(&mlxsw_sp->span->analyzed_ports_lock);
+
+	if (mlxsw_sp_span_analyzed_port_find(mlxsw_sp->span, port->local_port,
+					     false))
+		err = mlxsw_sp_span_port_buffer_update(port, mtu);
+
+	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
+
+	return err;
 }
 
 void mlxsw_sp_span_speed_update_work(struct work_struct *work)
 {
 	struct delayed_work *dwork = to_delayed_work(work);
 	struct mlxsw_sp_port *mlxsw_sp_port;
+	struct mlxsw_sp *mlxsw_sp;
 
 	mlxsw_sp_port = container_of(dwork, struct mlxsw_sp_port,
 				     span.speed_update_dw);
@@ -844,9 +851,15 @@ void mlxsw_sp_span_speed_update_work(struct work_struct *work)
 	/* If port is egress mirrored, the shared buffer size should be
 	 * updated according to the speed value.
 	 */
-	if (mlxsw_sp_span_is_egress_mirror(mlxsw_sp_port))
+	mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	mutex_lock(&mlxsw_sp->span->analyzed_ports_lock);
+
+	if (mlxsw_sp_span_analyzed_port_find(mlxsw_sp->span,
+					     mlxsw_sp_port->local_port, false))
 		mlxsw_sp_span_port_buffer_update(mlxsw_sp_port,
 						 mlxsw_sp_port->dev->mtu);
+
+	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
 }
 
 static struct mlxsw_sp_span_inspected_port *
@@ -1117,21 +1130,6 @@ void mlxsw_sp_span_agent_put(struct mlxsw_sp *mlxsw_sp, int span_id)
 	mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
 }
 
-static struct mlxsw_sp_span_analyzed_port *
-mlxsw_sp_span_analyzed_port_find(struct mlxsw_sp_span *span, u8 local_port,
-				 bool ingress)
-{
-	struct mlxsw_sp_span_analyzed_port *analyzed_port;
-
-	list_for_each_entry(analyzed_port, &span->analyzed_ports_list, list) {
-		if (analyzed_port->local_port == local_port &&
-		    analyzed_port->ingress == ingress)
-			return analyzed_port;
-	}
-
-	return NULL;
-}
-
 static struct mlxsw_sp_span_analyzed_port *
 mlxsw_sp_span_analyzed_port_create(struct mlxsw_sp_span *span,
 				   struct mlxsw_sp_port *mlxsw_sp_port,
-- 
2.24.1

[PATCH net-next 9/9] mlxsw: spectrum_span: Remove old SPAN API

[Ido Schimmel]

From: Ido Schimmel <idosch@mellanox.com>

Remove the old SPAN API now that matchall-based and flower-based
mirroring were converted to use the new API.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 190 +-----------------
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |  21 --
 2 files changed, 2 insertions(+), 209 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 9cb8b509b849..304eb8c3d8bd 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -74,12 +74,8 @@ int mlxsw_sp_span_init(struct mlxsw_sp *mlxsw_sp)
 	span->mlxsw_sp = mlxsw_sp;
 	mlxsw_sp->span = span;
 
-	for (i = 0; i < mlxsw_sp->span->entries_count; i++) {
-		struct mlxsw_sp_span_entry *curr = &mlxsw_sp->span->entries[i];
-
-		INIT_LIST_HEAD(&curr->bound_ports_list);
-		curr->id = i;
-	}
+	for (i = 0; i < mlxsw_sp->span->entries_count; i++)
+		mlxsw_sp->span->entries[i].id = i;
 
 	devlink_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_SPAN,
 					  mlxsw_sp_span_occ_get, mlxsw_sp);
@@ -91,16 +87,10 @@ int mlxsw_sp_span_init(struct mlxsw_sp *mlxsw_sp)
 void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp)
 {
 	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
-	int i;
 
 	cancel_work_sync(&mlxsw_sp->span->work);
 	devlink_resource_occ_get_unregister(devlink, MLXSW_SP_RESOURCE_SPAN);
 
-	for (i = 0; i < mlxsw_sp->span->entries_count; i++) {
-		struct mlxsw_sp_span_entry *curr = &mlxsw_sp->span->entries[i];
-
-		WARN_ON_ONCE(!list_empty(&curr->bound_ports_list));
-	}
 	WARN_ON_ONCE(!list_empty(&mlxsw_sp->span->trigger_entries_list));
 	WARN_ON_ONCE(!list_empty(&mlxsw_sp->span->analyzed_ports_list));
 	mutex_destroy(&mlxsw_sp->span->analyzed_ports_lock);
@@ -862,131 +852,6 @@ void mlxsw_sp_span_speed_update_work(struct work_struct *work)
 	mutex_unlock(&mlxsw_sp->span->analyzed_ports_lock);
 }
 
-static struct mlxsw_sp_span_inspected_port *
-mlxsw_sp_span_entry_bound_port_find(struct mlxsw_sp_span_entry *span_entry,
-				    enum mlxsw_sp_span_type type,
-				    struct mlxsw_sp_port *port,
-				    bool bind)
-{
-	struct mlxsw_sp_span_inspected_port *p;
-
-	list_for_each_entry(p, &span_entry->bound_ports_list, list)
-		if (type == p->type &&
-		    port->local_port == p->local_port &&
-		    bind == p->bound)
-			return p;
-	return NULL;
-}
-
-static int
-mlxsw_sp_span_inspected_port_bind(struct mlxsw_sp_port *port,
-				  struct mlxsw_sp_span_entry *span_entry,
-				  enum mlxsw_sp_span_type type,
-				  bool bind)
-{
-	struct mlxsw_sp *mlxsw_sp = port->mlxsw_sp;
-	char mpar_pl[MLXSW_REG_MPAR_LEN];
-	int pa_id = span_entry->id;
-
-	/* bind the port to the SPAN entry */
-	mlxsw_reg_mpar_pack(mpar_pl, port->local_port,
-			    (enum mlxsw_reg_mpar_i_e)type, bind, pa_id);
-	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mpar), mpar_pl);
-}
-
-static int
-mlxsw_sp_span_inspected_port_add(struct mlxsw_sp_port *port,
-				 struct mlxsw_sp_span_entry *span_entry,
-				 enum mlxsw_sp_span_type type,
-				 bool bind)
-{
-	struct mlxsw_sp_span_inspected_port *inspected_port;
-	struct mlxsw_sp *mlxsw_sp = port->mlxsw_sp;
-	char sbib_pl[MLXSW_REG_SBIB_LEN];
-	int i;
-	int err;
-
-	/* A given (source port, direction) can only be bound to one analyzer,
-	 * so if a binding is requested, check for conflicts.
-	 */
-	if (bind)
-		for (i = 0; i < mlxsw_sp->span->entries_count; i++) {
-			struct mlxsw_sp_span_entry *curr =
-				&mlxsw_sp->span->entries[i];
-
-			if (mlxsw_sp_span_entry_bound_port_find(curr, type,
-								port, bind))
-				return -EEXIST;
-		}
-
-	/* if it is an egress SPAN, bind a shared buffer to it */
-	if (type == MLXSW_SP_SPAN_EGRESS) {
-		err = mlxsw_sp_span_port_buffer_update(port, port->dev->mtu);
-		if (err)
-			return err;
-	}
-
-	if (bind) {
-		err = mlxsw_sp_span_inspected_port_bind(port, span_entry, type,
-							true);
-		if (err)
-			goto err_port_bind;
-	}
-
-	inspected_port = kzalloc(sizeof(*inspected_port), GFP_KERNEL);
-	if (!inspected_port) {
-		err = -ENOMEM;
-		goto err_inspected_port_alloc;
-	}
-	inspected_port->local_port = port->local_port;
-	inspected_port->type = type;
-	inspected_port->bound = bind;
-	list_add_tail(&inspected_port->list, &span_entry->bound_ports_list);
-
-	return 0;
-
-err_inspected_port_alloc:
-	if (bind)
-		mlxsw_sp_span_inspected_port_bind(port, span_entry, type,
-						  false);
-err_port_bind:
-	if (type == MLXSW_SP_SPAN_EGRESS) {
-		mlxsw_reg_sbib_pack(sbib_pl, port->local_port, 0);
-		mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
-	}
-	return err;
-}
-
-static void
-mlxsw_sp_span_inspected_port_del(struct mlxsw_sp_port *port,
-				 struct mlxsw_sp_span_entry *span_entry,
-				 enum mlxsw_sp_span_type type,
-				 bool bind)
-{
-	struct mlxsw_sp_span_inspected_port *inspected_port;
-	struct mlxsw_sp *mlxsw_sp = port->mlxsw_sp;
-	char sbib_pl[MLXSW_REG_SBIB_LEN];
-
-	inspected_port = mlxsw_sp_span_entry_bound_port_find(span_entry, type,
-							     port, bind);
-	if (!inspected_port)
-		return;
-
-	if (bind)
-		mlxsw_sp_span_inspected_port_bind(port, span_entry, type,
-						  false);
-	/* remove the SBIB buffer if it was egress SPAN */
-	if (type == MLXSW_SP_SPAN_EGRESS) {
-		mlxsw_reg_sbib_pack(sbib_pl, port->local_port, 0);
-		mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
-	}
-
-	mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
-
-	list_del(&inspected_port->list);
-	kfree(inspected_port);
-}
-
 static const struct mlxsw_sp_span_entry_ops *
 mlxsw_sp_span_entry_ops(struct mlxsw_sp *mlxsw_sp,
 			const struct net_device *to_dev)
@@ -1000,57 +865,6 @@ mlxsw_sp_span_entry_ops(struct mlxsw_sp *mlxsw_sp,
 	return NULL;
 }
 
-int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
-			     const struct net_device *to_dev,
-			     enum mlxsw_sp_span_type type, bool bind,
-			     int *p_span_id)
-{
-	struct mlxsw_sp *mlxsw_sp = from->mlxsw_sp;
-	const struct mlxsw_sp_span_entry_ops *ops;
-	struct mlxsw_sp_span_parms sparms = {NULL};
-	struct mlxsw_sp_span_entry *span_entry;
-	int err;
-
-	ops = mlxsw_sp_span_entry_ops(mlxsw_sp, to_dev);
-	if (!ops) {
-		netdev_err(to_dev, "Cannot mirror to %s", to_dev->name);
-		return -EOPNOTSUPP;
-	}
-
-	err = ops->parms_set(to_dev, &sparms);
-	if (err)
-		return err;
-
-	span_entry = mlxsw_sp_span_entry_get(mlxsw_sp, to_dev, ops, sparms);
-	if (!span_entry)
-		return -ENOBUFS;
-
-	err = mlxsw_sp_span_inspected_port_add(from, span_entry, type, bind);
-	if (err)
-		goto err_port_bind;
-
-	*p_span_id = span_entry->id;
-	return 0;
-
-err_port_bind:
-	mlxsw_sp_span_entry_put(mlxsw_sp, span_entry);
-	return err;
-}
-
-void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, int span_id,
-			      enum mlxsw_sp_span_type type, bool bind)
-{
-	struct mlxsw_sp_span_entry *span_entry;
-
-	span_entry = mlxsw_sp_span_entry_find_by_id(from->mlxsw_sp, span_id);
-	if (!span_entry) {
-		netdev_err(from->dev, "no span entry found\n");
-		return;
-	}
-
-	mlxsw_sp_span_inspected_port_del(from, span_entry, type, bind);
-}
-
 static void mlxsw_sp_span_respin_work(struct work_struct *work)
 {
 	struct mlxsw_sp_span *span;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
index 6821eeb3906b..9f6dd2d0f4e6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.h
@@ -13,20 +13,6 @@
 struct mlxsw_sp;
 struct mlxsw_sp_port;
 
-enum mlxsw_sp_span_type {
-	MLXSW_SP_SPAN_EGRESS,
-	MLXSW_SP_SPAN_INGRESS
-};
-
-struct mlxsw_sp_span_inspected_port {
-	struct list_head list;
-	enum mlxsw_sp_span_type type;
-	u8 local_port;
-
-	/* Whether this is a directly bound mirror (port-to-port) or an ACL. */
-	bool bound;
-};
-
 struct mlxsw_sp_span_parms {
 	struct mlxsw_sp_port *dest_port; /* NULL for unoffloaded SPAN. */
 	unsigned int ttl;
@@ -52,7 +38,6 @@ struct mlxsw_sp_span_entry {
 	const struct net_device *to_dev;
 	const struct mlxsw_sp_span_entry_ops *ops;
 	struct mlxsw_sp_span_parms parms;
-	struct list_head bound_ports_list;
 	refcount_t ref_count;
 	int id;
 };
@@ -70,12 +55,6 @@ int mlxsw_sp_span_init(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_span_fini(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_span_respin(struct mlxsw_sp *mlxsw_sp);
 
-int mlxsw_sp_span_mirror_add(struct mlxsw_sp_port *from,
-			     const struct net_device *to_dev,
-			     enum mlxsw_sp_span_type type,
-			     bool bind, int *p_span_id);
-void mlxsw_sp_span_mirror_del(struct mlxsw_sp_port *from, int span_id,
-			      enum mlxsw_sp_span_type type, bool bind);
 struct mlxsw_sp_span_entry *
 mlxsw_sp_span_entry_find_by_port(struct mlxsw_sp *mlxsw_sp,
 				 const struct net_device *to_dev);
-- 
2.24.1

Re: [PATCH net-next 0/9] mlxsw: Prepare SPAN API for upcoming changes

[David Miller]

From: Ido Schimmel <idosch@idosch.org>
Date: Thu, 30 Apr 2020 20:01:07 +0300

> Switched port analyzer (SPAN) is used for packet mirroring. Over mlxsw
> this is achieved by attaching tc-mirred action to either matchall or
> flower classifier.
> 
> The current API used to configure SPAN consists of two functions:
> mlxsw_sp_span_mirror_add() and mlxsw_sp_span_mirror_del().
> 
> These two functions pack a lot of different operations:
> 
> * SPAN agent configuration: Determining the egress port and optional
>   headers that need to encapsulate the mirrored packet (when mirroring
>   to a gretap, for example)
> 
> * Egress mirror buffer configuration: Allocating / freeing a buffer when
>   port is analyzed (inspected) at egress
> 
> * SPAN agent binding: Binding the SPAN agent to a trigger, if any. The
>   current triggers are incoming / outgoing packet and they are only used
>   for matchall-based mirroring
> 
> This non-modular design makes it difficult to extend the API for future
> changes, such as new mirror targets (CPU) and new global triggers (early
> dropped packets, for example).
> 
> Therefore, this patch set gradually adds APIs for above mentioned
> operations and then converts the two existing users to use it instead of
> the old API. No functional changes intended. Tested with existing
> mirroring selftests.
> 
> Patch set overview:
> 
> Patches #1-#5 gradually add the new API
> Patches #6-#8 convert existing users to use the new API
> Patch #9 removes the old API

Looks good, series applied, thanks!