[PATCH 1/3] net: marvell: prestera: fix driver reload

[Elad Nachman]

From: Elad Nachman <enachman@xxxxxxxxxxx>

Driver rmmod after insmod would fail because of
the following issues:

1. API call to reset the switch HW and restart the
   firmware CPU firmware code loading was missing in
   driver removal code handler.
2. Timeout waiting for the firmware CPU firmware
   loader code to start was too small.

Fix by adding API call to reset the switch HW and
restart the firmware CPU firmware code loading when
handling the driver removal procedure,
increase the timeout waiting for this restart operation
from 5 to 30 seconds.

Reported-by: Köry Maincent <kory.maincent@xxxxxxxxxxx>
Closes: https://lore.kernel.org/netdev/20240208101005.29e8c7f3@kmaincent-XPS-13-7390/T/
Signed-off-by: Elad Nachman <enachman@xxxxxxxxxxx>
---
 drivers/net/ethernet/marvell/prestera/prestera_hw.c   | 8 ++++++++
 drivers/net/ethernet/marvell/prestera/prestera_hw.h   | 1 +
 drivers/net/ethernet/marvell/prestera/prestera_main.c | 3 ++-
 drivers/net/ethernet/marvell/prestera/prestera_pci.c  | 7 ++++++-
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
index fc6f7d2746e8..08de8b498e0a 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_hw.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_hw.c
@@ -21,6 +21,7 @@
 enum prestera_cmd_type_t {
 	PRESTERA_CMD_TYPE_SWITCH_INIT = 0x1,
 	PRESTERA_CMD_TYPE_SWITCH_ATTR_SET = 0x2,
+	PRESTERA_CMD_TYPE_SWITCH_RESET = 0x4,
 
 	PRESTERA_CMD_TYPE_PORT_ATTR_SET = 0x100,
 	PRESTERA_CMD_TYPE_PORT_ATTR_GET = 0x101,
@@ -1087,6 +1088,13 @@ void prestera_hw_switch_fini(struct prestera_switch *sw)
 	WARN_ON(!list_empty(&sw->event_handlers));
 }
 
+int prestera_hw_switch_reset(struct prestera_switch *sw)
+{
+	struct prestera_msg_common_req req;
+
+	return prestera_cmd(sw, PRESTERA_CMD_TYPE_SWITCH_RESET, &req.cmd, sizeof(req));
+}
+
 int prestera_hw_switch_ageing_set(struct prestera_switch *sw, u32 ageing_ms)
 {
 	struct prestera_msg_switch_attr_req req = {
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_hw.h b/drivers/net/ethernet/marvell/prestera/prestera_hw.h
index 0a929279e1ce..86217bea2ca0 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_hw.h
+++ b/drivers/net/ethernet/marvell/prestera/prestera_hw.h
@@ -150,6 +150,7 @@ struct prestera_neigh_info;
 
 /* Switch API */
 int prestera_hw_switch_init(struct prestera_switch *sw);
+int prestera_hw_switch_reset(struct prestera_switch *sw);
 void prestera_hw_switch_fini(struct prestera_switch *sw);
 int prestera_hw_switch_ageing_set(struct prestera_switch *sw, u32 ageing_ms);
 int prestera_hw_switch_mac_set(struct prestera_switch *sw, const char *mac);
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index 4fb886c57cd7..bcaa8ea27b49 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -1444,7 +1444,7 @@ static int prestera_switch_init(struct prestera_switch *sw)
 err_router_init:
 	prestera_netdev_event_handler_unregister(sw);
 	prestera_hw_switch_fini(sw);
-
+	prestera_hw_switch_reset(sw);
 	return err;
 }
 
@@ -1463,6 +1463,7 @@ static void prestera_switch_fini(struct prestera_switch *sw)
 	prestera_router_fini(sw);
 	prestera_netdev_event_handler_unregister(sw);
 	prestera_hw_switch_fini(sw);
+	prestera_hw_switch_reset(sw);
 	of_node_put(sw->np);
 }
 
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
index 35857dc19542..b75a263ad8cb 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_pci.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
@@ -24,6 +24,11 @@
 #define PRESTERA_FW_ARM64_PATH_FMT "mrvl/prestera/mvsw_prestera_fw_arm64-v%u.%u.img"
 
 #define PRESTERA_FW_HDR_MAGIC		0x351D9D06
+/* Timeout waiting for prestera firmware CPU to reboot and
+ * restart the firmware loading software layer, hence becoming
+ * ready for the next firmware downloading phase:
+ */
+#define PRESTERA_FW_READY_TIMEOUT_SECS	30
 #define PRESTERA_FW_DL_TIMEOUT_MS	50000
 #define PRESTERA_FW_BLK_SZ		1024
 
@@ -765,7 +770,7 @@ static int prestera_fw_load(struct prestera_fw *fw)
 
 	err = prestera_ldr_wait_reg32(fw, PRESTERA_LDR_READY_REG,
 				      PRESTERA_LDR_READY_MAGIC,
-				      5 * MSEC_PER_SEC);
+				      PRESTERA_FW_READY_TIMEOUT_SECS * MSEC_PER_SEC);
 	if (err) {
 		dev_err(fw->dev.dev, "waiting for FW loader is timed out");
 		return err;
-- 
2.25.1