Linux Ethernet Bridging - Feb 2021 - [Bridge] [PATCH net 2/2] switchdev: mrp: Remove SWITCHDEV_ATTR_ID_MRP_PORT_STAT

Based on the discussion here[1], there was a problem with the function
br_mrp_port_switchdev_set_state. The problem was that it was called
both with BR_STATE* and BR_MRP_PORT_STATE* types. This patch series
fixes this issue and removes SWITCHDEV_ATTR_ID_MRP_PORT_STAT because
is not used anymore.

[1] https://www.spinics.net/lists/netdev/msg714816.html

Horatiu Vultur (2):
  bridge: mrp: Fix the usage of br_mrp_port_switchdev_set_state
  switchdev: mrp: Remove SWITCHDEV_ATTR_ID_MRP_PORT_STAT

 include/net/switchdev.h       | 2 --
 net/bridge/br_mrp.c           | 9 ++++++---
 net/bridge/br_mrp_switchdev.c | 7 +++----
 net/bridge/br_private_mrp.h   | 3 +--
 4 files changed, 10 insertions(+), 11 deletions(-)

-- 
2.27.0

The function br_mrp_port_switchdev_set_state was called both with MRP
port state and STP port state, which is an issue because they don't
match exactly.

Therefore, update the function to be used only with STP port state and
use the id SWITCHDEV_ATTR_ID_PORT_STP_STATE.

The choice of using STP over MRP is that the drivers already implement
SWITCHDEV_ATTR_ID_PORT_STP_STATE and already in SW we update the port
STP state.

Fixes: 9a9f26e8f7ea30 ("bridge: mrp: Connect MRP API with the switchdev
API")
Fixes: fadd409136f0f2 ("bridge: switchdev: mrp: Implement MRP API for
switchdev")
Fixes: 2f1a11ae11d222 ("bridge: mrp: Add MRP interface.")
Reported-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
Signed-off-by: Horatiu Vultur <horatiu.vultur at microchip.com>
---
 net/bridge/br_mrp.c           | 9 ++++++---
 net/bridge/br_mrp_switchdev.c | 7 +++----
 net/bridge/br_private_mrp.h   | 3 +--
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
index cec2c4e4561d..5aeae6ad17b3 100644
--- a/net/bridge/br_mrp.c
+++ b/net/bridge/br_mrp.c
@@ -557,19 +557,22 @@ int br_mrp_del(struct net_bridge *br, struct
br_mrp_instance *instance)
 int br_mrp_set_port_state(struct net_bridge_port *p,
 			  enum br_mrp_port_state_type state)
 {
+	u32 port_state;
+
 	if (!p || !(p->flags & BR_MRP_AWARE))
 		return -EINVAL;
 
 	spin_lock_bh(&p->br->lock);
 
 	if (state == BR_MRP_PORT_STATE_FORWARDING)
-		p->state = BR_STATE_FORWARDING;
+		port_state = BR_STATE_FORWARDING;
 	else
-		p->state = BR_STATE_BLOCKING;
+		port_state = BR_STATE_BLOCKING;
 
+	p->state = port_state;
 	spin_unlock_bh(&p->br->lock);
 
-	br_mrp_port_switchdev_set_state(p, state);
+	br_mrp_port_switchdev_set_state(p, port_state);
 
 	return 0;
 }
diff --git a/net/bridge/br_mrp_switchdev.c b/net/bridge/br_mrp_switchdev.c
index ed547e03ace1..75a7e8d0a268 100644
--- a/net/bridge/br_mrp_switchdev.c
+++ b/net/bridge/br_mrp_switchdev.c
@@ -169,13 +169,12 @@ int br_mrp_switchdev_send_in_test(struct net_bridge *br,
struct br_mrp *mrp,
 	return err;
 }
 
-int br_mrp_port_switchdev_set_state(struct net_bridge_port *p,
-				    enum br_mrp_port_state_type state)
+int br_mrp_port_switchdev_set_state(struct net_bridge_port *p, u32 state)
 {
 	struct switchdev_attr attr = {
 		.orig_dev = p->dev,
-		.id = SWITCHDEV_ATTR_ID_MRP_PORT_STATE,
-		.u.mrp_port_state = state,
+		.id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
+		.u.stp_state = state,
 	};
 	int err;
 
diff --git a/net/bridge/br_private_mrp.h b/net/bridge/br_private_mrp.h
index 32a48e5418da..2514954c1431 100644
--- a/net/bridge/br_private_mrp.h
+++ b/net/bridge/br_private_mrp.h
@@ -72,8 +72,7 @@ int br_mrp_switchdev_set_ring_state(struct net_bridge *br,
struct br_mrp *mrp,
 int br_mrp_switchdev_send_ring_test(struct net_bridge *br, struct br_mrp *mrp,
 				    u32 interval, u8 max_miss, u32 period,
 				    bool monitor);
-int br_mrp_port_switchdev_set_state(struct net_bridge_port *p,
-				    enum br_mrp_port_state_type state);
+int br_mrp_port_switchdev_set_state(struct net_bridge_port *p, u32 state);
 int br_mrp_port_switchdev_set_role(struct net_bridge_port *p,
 				   enum br_mrp_port_role_type role);
 int br_mrp_switchdev_set_in_role(struct net_bridge *br, struct br_mrp *mrp,
-- 
2.27.0

Now that MRP started to use also SWITCHDEV_ATTR_ID_PORT_STP_STATE to
notify HW, then SWITCHDEV_ATTR_ID_MRP_PORT_STAT is not used anywhere
else, therefore we can remove it.

Fixes: c284b545900830 ("switchdev: mrp: Extend switchdev API to offload
MRP")
Signed-off-by: Horatiu Vultur <horatiu.vultur at microchip.com>
---
 include/net/switchdev.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 99cd538d6519..afdf8bd1b4fe 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -42,7 +42,6 @@ enum switchdev_attr_id {
 	SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
 	SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
-	SWITCHDEV_ATTR_ID_MRP_PORT_STATE,
 	SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
 #endif
 };
@@ -62,7 +61,6 @@ struct switchdev_attr {
 		u16 vlan_protocol;			/* BRIDGE_VLAN_PROTOCOL */
 		bool mc_disabled;			/* MC_DISABLED */
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
-		u8 mrp_port_state;			/* MRP_PORT_STATE */
 		u8 mrp_port_role;			/* MRP_PORT_ROLE */
 #endif
 	} u;
-- 
2.27.0

Hello:

This series was applied to netdev/net.git (refs/heads/master):

On Sat, 6 Feb 2021 22:47:32 +0100 you wrote:
> Based on the discussion here[1], there was a problem with the function
> br_mrp_port_switchdev_set_state. The problem was that it was called
> both with BR_STATE* and BR_MRP_PORT_STATE* types. This patch series
> fixes this issue and removes SWITCHDEV_ATTR_ID_MRP_PORT_STAT because
> is not used anymore.
> 
> [1] https://www.spinics.net/lists/netdev/msg714816.html
> 
> [...]
Here is the summary with links:
  - [net,1/2] bridge: mrp: Fix the usage of br_mrp_port_switchdev_set_state
    https://git.kernel.org/netdev/net/c/b2bdba1cbc84
  - [net,2/2] switchdev: mrp: Remove SWITCHDEV_ATTR_ID_MRP_PORT_STAT
    https://git.kernel.org/netdev/net/c/059d2a100498

You are awesome, thank you!
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