netdev - [PATCH net-next 4/5] ice: disable FW logging on driver unload

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Date:   Thu,  9 Feb 2023 11:07:01 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        jacob.e.keller@...el.com, jiri@...dia.com, idosch@...sch.org,
        Gurucharan G <gurucharanx.g@...el.com>
Subject: [PATCH net-next 4/5] ice: disable FW logging on driver unload

From: Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>

The FW is running in it's own context irregardless of what the driver
is doing. In this case, if the driver previously registered for FW
log events and then the driver unloads without informing the FW to
unregister for FW log events then the FW still has a timer running to
output FW logs.

The next time the driver loads and tries to register for FW log events
then the FW returns an error, but still enables the continued
outputting of FW logs. This causes an IO error to devlink which isn't
intuitive since the logs are still being output.

Fix this by disabling FW logging when the driver is being unloaded.

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>
Tested-by: Gurucharan G <gurucharanx.g@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 29 +++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 055849dc608a..cf8c9220a6d7 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -4526,6 +4526,33 @@ static void ice_unregister_netdev(struct ice_vsi *vsi)
 	clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
 }
 
+/**
+ * ice_pf_fwlog_deinit - clear FW logging metadata on device exit
+ * @pf: pointer to the PF struct
+ */
+static void ice_pf_fwlog_deinit(struct ice_pf *pf)
+{
+	struct ice_hw *hw = &pf->hw;
+
+	/* make sure FW logging is disabled to not put the FW in a weird state
+	 * for the next driver load
+	 */
+	if (hw->fwlog_ena) {
+		int status;
+
+		hw->fwlog_cfg.options &= ~ICE_FWLOG_OPTION_ARQ_ENA;
+		status = ice_fwlog_set(hw, &hw->fwlog_cfg);
+		if (status)
+			dev_warn(ice_pf_to_dev(pf), "Unable to turn off FW logging, status: %d\n",
+				 status);
+
+		status = ice_fwlog_unregister(hw);
+		if (status)
+			dev_warn(ice_pf_to_dev(pf), "Unable to unregister FW logging, status: %d\n",
+				 status);
+	}
+}
+
 /**
  * ice_cfg_netdev - Allocate, configure and register a netdev
  * @vsi: the VSI associated with the new netdev
@@ -5266,6 +5293,8 @@ static void ice_remove(struct pci_dev *pdev)
 		msleep(100);
 	}
 
+	ice_pf_fwlog_deinit(pf);
+
 	if (test_bit(ICE_FLAG_SRIOV_ENA, pf->flags)) {
 		set_bit(ICE_VF_RESETS_DISABLED, pf->state);
 		ice_free_vfs(pf);
-- 
2.38.1