diff mbox series

[v6,iwl-next,1/7] ice: introduce PTP state machine

Message ID 20240118174552.2565889-2-karol.kolacinski@intel.com
State Changes Requested
Headers show
Series ice: fix timestamping in reset process | expand

Commit Message

Karol Kolacinski Jan. 18, 2024, 5:45 p.m. UTC 
Add PTP state machine so that the driver can correctly identify PTP
state around resets.
When the driver got information about ungraceful reset, PTP was not
prepared for reset and it returned error. When this situation occurs,
prepare PTP before rebuilding its structures.

Co-authored-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
---
V5 -> V6: refactored prepare_for_reset() bit in ice_ptp_reset()
V3 -> V4: removed merge conflict leftovers
V2 -> V3: fixed Tx timestamps missing by moving ICE_PTP_READY before
          ice_ptp_init_work()

 drivers/net/ethernet/intel/ice/ice.h         |   1 -
 drivers/net/ethernet/intel/ice/ice_ethtool.c |   2 +-
 drivers/net/ethernet/intel/ice/ice_ptp.c     | 110 +++++++++++--------
 drivers/net/ethernet/intel/ice/ice_ptp.h     |  10 ++
 4 files changed, 74 insertions(+), 49 deletions(-)

Comments

Simon Horman Jan. 23, 2024, 4:38 p.m. UTC | #1 
On Thu, Jan 18, 2024 at 06:45:46PM +0100, Karol Kolacinski wrote:
> Add PTP state machine so that the driver can correctly identify PTP
> state around resets.
> When the driver got information about ungraceful reset, PTP was not
> prepared for reset and it returned error. When this situation occurs,
> prepare PTP before rebuilding its structures.
> 
> Co-authored-by: Karol Kolacinski <karol.kolacinski@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
> ---
> V5 -> V6: refactored prepare_for_reset() bit in ice_ptp_reset()

Thanks for the update.

Reviewed-by: Simon Horman <horms@kernel.org>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index e841f6c4f1c4..a4ba60e17d0b 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -493,7 +493,6 @@  enum ice_pf_flags {
 	ICE_FLAG_DCB_ENA,
 	ICE_FLAG_FD_ENA,
 	ICE_FLAG_PTP_SUPPORTED,		/* PTP is supported by NVM */
-	ICE_FLAG_PTP,			/* PTP is enabled by software */
 	ICE_FLAG_ADV_FEATURES,
 	ICE_FLAG_TC_MQPRIO,		/* support for Multi queue TC */
 	ICE_FLAG_CLS_FLOWER,
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index f25e43881df2..3cc364a4d682 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -3361,7 +3361,7 @@  ice_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
 	struct ice_pf *pf = ice_netdev_to_pf(dev);
 
 	/* only report timestamping if PTP is enabled */
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return ethtool_op_get_ts_info(dev, info);
 
 	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 3b6605c8585e..8ed4af219f9b 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1430,7 +1430,7 @@  void ice_ptp_link_change(struct ice_pf *pf, u8 port, bool linkup)
 	struct ice_ptp_port *ptp_port;
 	struct ice_hw *hw = &pf->hw;
 
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return;
 
 	if (WARN_ON_ONCE(port >= ICE_NUM_EXTERNAL_PORTS))
@@ -2162,7 +2162,7 @@  int ice_ptp_get_ts_config(struct ice_pf *pf, struct ifreq *ifr)
 {
 	struct hwtstamp_config *config;
 
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return -EIO;
 
 	config = &pf->ptp.tstamp_config;
@@ -2232,7 +2232,7 @@  int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
 	struct hwtstamp_config config;
 	int err;
 
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return -EAGAIN;
 
 	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
@@ -2616,7 +2616,7 @@  static void ice_ptp_periodic_work(struct kthread_work *work)
 	struct ice_pf *pf = container_of(ptp, struct ice_pf, ptp);
 	int err;
 
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return;
 
 	err = ice_ptp_update_cached_phctime(pf);
@@ -2628,6 +2628,42 @@  static void ice_ptp_periodic_work(struct kthread_work *work)
 				   msecs_to_jiffies(err ? 10 : 500));
 }
 
+/**
+ * ice_ptp_prepare_for_reset - Prepare PTP for reset
+ * @pf: Board private structure
+ */
+void ice_ptp_prepare_for_reset(struct ice_pf *pf)
+{
+	struct ice_ptp *ptp = &pf->ptp;
+	u8 src_tmr;
+
+	if (ptp->state != ICE_PTP_READY)
+		return;
+
+	ptp->state = ICE_PTP_RESETTING;
+
+	/* Disable timestamping for both Tx and Rx */
+	ice_ptp_disable_timestamp_mode(pf);
+
+	kthread_cancel_delayed_work_sync(&ptp->work);
+
+	if (test_bit(ICE_PFR_REQ, pf->state))
+		return;
+
+	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
+
+	/* Disable periodic outputs */
+	ice_ptp_disable_all_clkout(pf);
+
+	src_tmr = ice_get_ptp_src_clock_index(&pf->hw);
+
+	/* Disable source clock */
+	wr32(&pf->hw, GLTSYN_ENA(src_tmr), (u32)~GLTSYN_ENA_TSYN_ENA_M);
+
+	/* Acquire PHC and system timer to restore after reset */
+	ptp->reset_time = ktime_get_real_ns();
+}
+
 /**
  * ice_ptp_reset - Initialize PTP hardware clock support after reset
  * @pf: Board private structure
@@ -2640,6 +2676,14 @@  void ice_ptp_reset(struct ice_pf *pf)
 	int err, itr = 1;
 	u64 time_diff;
 
+	if (ptp->state == ICE_PTP_READY) {
+		ice_ptp_prepare_for_reset(pf);
+	} else if (ptp->state != ICE_PTP_RESETTING) {
+		err = -EINVAL;
+		dev_err(ice_pf_to_dev(pf), "PTP was not initialized\n");
+		goto err;
+	}
+
 	if (test_bit(ICE_PFR_REQ, pf->state) ||
 	    !ice_pf_src_tmr_owned(pf))
 		goto pfr;
@@ -2700,7 +2744,7 @@  void ice_ptp_reset(struct ice_pf *pf)
 	if (err)
 		goto err;
 
-	set_bit(ICE_FLAG_PTP, pf->flags);
+	ptp->state = ICE_PTP_READY;
 
 	/* Restart the PHY timestamping block */
 	if (!test_bit(ICE_PFR_REQ, pf->state) &&
@@ -2714,6 +2758,7 @@  void ice_ptp_reset(struct ice_pf *pf)
 	return;
 
 err:
+	ptp->state = ICE_PTP_ERROR;
 	dev_err(ice_pf_to_dev(pf), "PTP reset failed %d\n", err);
 }
 
@@ -2922,39 +2967,6 @@  int ice_ptp_clock_index(struct ice_pf *pf)
 	return clock ? ptp_clock_index(clock) : -1;
 }
 
-/**
- * ice_ptp_prepare_for_reset - Prepare PTP for reset
- * @pf: Board private structure
- */
-void ice_ptp_prepare_for_reset(struct ice_pf *pf)
-{
-	struct ice_ptp *ptp = &pf->ptp;
-	u8 src_tmr;
-
-	clear_bit(ICE_FLAG_PTP, pf->flags);
-
-	/* Disable timestamping for both Tx and Rx */
-	ice_ptp_disable_timestamp_mode(pf);
-
-	kthread_cancel_delayed_work_sync(&ptp->work);
-
-	if (test_bit(ICE_PFR_REQ, pf->state))
-		return;
-
-	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
-
-	/* Disable periodic outputs */
-	ice_ptp_disable_all_clkout(pf);
-
-	src_tmr = ice_get_ptp_src_clock_index(&pf->hw);
-
-	/* Disable source clock */
-	wr32(&pf->hw, GLTSYN_ENA(src_tmr), (u32)~GLTSYN_ENA_TSYN_ENA_M);
-
-	/* Acquire PHC and system timer to restore after reset */
-	ptp->reset_time = ktime_get_real_ns();
-}
-
 /**
  * ice_ptp_init_owner - Initialize PTP_1588_CLOCK device
  * @pf: Board private structure
@@ -3195,6 +3207,8 @@  void ice_ptp_init(struct ice_pf *pf)
 	struct ice_hw *hw = &pf->hw;
 	int err;
 
+	ptp->state = ICE_PTP_INITIALIZING;
+
 	ice_ptp_init_phy_model(hw);
 
 	ice_ptp_init_tx_interrupt_mode(pf);
@@ -3219,12 +3233,13 @@  void ice_ptp_init(struct ice_pf *pf)
 	/* Configure initial Tx interrupt settings */
 	ice_ptp_cfg_tx_interrupt(pf);
 
-	set_bit(ICE_FLAG_PTP, pf->flags);
-	err = ice_ptp_init_work(pf, ptp);
+	err = ice_ptp_create_auxbus_device(pf);
 	if (err)
 		goto err;
 
-	err = ice_ptp_create_auxbus_device(pf);
+	ptp->state = ICE_PTP_READY;
+
+	err = ice_ptp_init_work(pf, ptp);
 	if (err)
 		goto err;
 
@@ -3237,7 +3252,7 @@  void ice_ptp_init(struct ice_pf *pf)
 		ptp_clock_unregister(ptp->clock);
 		pf->ptp.clock = NULL;
 	}
-	clear_bit(ICE_FLAG_PTP, pf->flags);
+	ptp->state = ICE_PTP_ERROR;
 	dev_err(ice_pf_to_dev(pf), "PTP failed %d\n", err);
 }
 
@@ -3250,9 +3265,11 @@  void ice_ptp_init(struct ice_pf *pf)
  */
 void ice_ptp_release(struct ice_pf *pf)
 {
-	if (!test_bit(ICE_FLAG_PTP, pf->flags))
+	if (pf->ptp.state != ICE_PTP_READY)
 		return;
 
+	pf->ptp.state = ICE_PTP_UNINIT;
+
 	/* Disable timestamping for both Tx and Rx */
 	ice_ptp_disable_timestamp_mode(pf);
 
@@ -3260,8 +3277,6 @@  void ice_ptp_release(struct ice_pf *pf)
 
 	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
 
-	clear_bit(ICE_FLAG_PTP, pf->flags);
-
 	kthread_cancel_delayed_work_sync(&pf->ptp.work);
 
 	ice_ptp_port_phy_stop(&pf->ptp.port);
@@ -3271,6 +3286,9 @@  void ice_ptp_release(struct ice_pf *pf)
 		pf->ptp.kworker = NULL;
 	}
 
+	if (ice_pf_src_tmr_owned(pf))
+		ice_ptp_unregister_auxbus_driver(pf);
+
 	if (!pf->ptp.clock)
 		return;
 
@@ -3280,7 +3298,5 @@  void ice_ptp_release(struct ice_pf *pf)
 	ptp_clock_unregister(pf->ptp.clock);
 	pf->ptp.clock = NULL;
 
-	ice_ptp_unregister_auxbus_driver(pf);
-
 	dev_info(ice_pf_to_dev(pf), "Removed PTP clock\n");
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 087dd32d8762..2457380142e1 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -203,8 +203,17 @@  struct ice_ptp_port_owner {
 
 #define GLTSYN_TGT_H_IDX_MAX		4
 
+enum ice_ptp_state {
+	ICE_PTP_UNINIT = 0,
+	ICE_PTP_INITIALIZING,
+	ICE_PTP_READY,
+	ICE_PTP_RESETTING,
+	ICE_PTP_ERROR,
+};
+
 /**
  * struct ice_ptp - data used for integrating with CONFIG_PTP_1588_CLOCK
+ * @state: current state of PTP state machine
  * @tx_interrupt_mode: the TX interrupt mode for the PTP clock
  * @port: data for the PHY port initialization procedure
  * @ports_owner: data for the auxiliary driver owner
@@ -227,6 +236,7 @@  struct ice_ptp_port_owner {
  * @late_cached_phc_updates: number of times cached PHC update is late
  */
 struct ice_ptp {
+	enum ice_ptp_state state;
 	enum ice_ptp_tx_interrupt tx_interrupt_mode;
 	struct ice_ptp_port port;
 	struct ice_ptp_port_owner ports_owner;