[PATCH v2 iwl-net 0/3] ice: Fix incorrect input/output pin behavior

[PATCH v2 iwl-net 0/3] ice: Fix incorrect input/output pin behavior

[Karol Kolacinski]

This patch series fixes incorrect external timestamps handling, which
may result in kernel crashes or not requested extts/perout behavior.

Jacob Keller (2):
  ice: Don't process extts if PTP is disabled
  ice: Reject pin requests with unsupported flags

Milena Olech (1):
  ice: Fix improper extts handling

 drivers/net/ethernet/intel/ice/ice_ptp.c | 132 +++++++++++++++++------
 drivers/net/ethernet/intel/ice/ice_ptp.h |   9 ++
 2 files changed, 111 insertions(+), 30 deletions(-)

V1 -> V2: Fixed typos and other formatting issues in all patches

base-commit: 0a8975e20f25bb2f5edb28d883dc715802231e71
-- 
2.43.0

[PATCH v2 iwl-net 1/3] ice: Fix improper extts handling

[Karol Kolacinski]

From: Milena Olech <milena.olech@intel.com>

Extts events are disabled and enabled by the application ts2phc.
However, in case where the driver is removed when the application is
running, channel remains enabled. As a result, in the next run of the
app, two channels are enabled and the information "extts on unexpected
channel" is printed to the user.

To avoid that, extts events shall be disabled when PTP is released.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
V1 -> V2: removed extra space and fixed return value in
          ice_ptp_gpio_enable_e823()

 drivers/net/ethernet/intel/ice/ice_ptp.c | 106 ++++++++++++++++++-----
 drivers/net/ethernet/intel/ice/ice_ptp.h |   8 ++
 2 files changed, 92 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 0f17fc1181d2..d8ff9f26010c 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1584,27 +1584,24 @@ void ice_ptp_extts_event(struct ice_pf *pf)
 /**
  * ice_ptp_cfg_extts - Configure EXTTS pin and channel
  * @pf: Board private structure
- * @ena: true to enable; false to disable
  * @chan: GPIO channel (0-3)
- * @gpio_pin: GPIO pin
- * @extts_flags: request flags from the ptp_extts_request.flags
+ * @config: desired EXTTS configuration.
+ * @store: If set to true, the values will be stored
+ *
+ * Configure an external timestamp event on the requested channel.
  */
-static int
-ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
-		  unsigned int extts_flags)
+static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
+			      struct ice_extts_channel *config, bool store)
 {
 	u32 func, aux_reg, gpio_reg, irq_reg;
 	struct ice_hw *hw = &pf->hw;
 	u8 tmr_idx;
 
-	if (chan > (unsigned int)pf->ptp.info.n_ext_ts)
-		return -EINVAL;
-
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	irq_reg = rd32(hw, PFINT_OICR_ENA);
 
-	if (ena) {
+	if (config->ena) {
 		/* Enable the interrupt */
 		irq_reg |= PFINT_OICR_TSYN_EVNT_M;
 		aux_reg = GLTSYN_AUX_IN_0_INT_ENA_M;
@@ -1613,9 +1610,9 @@ ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
 #define GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE	BIT(1)
 
 		/* set event level to requested edge */
-		if (extts_flags & PTP_FALLING_EDGE)
+		if (config->flags  & PTP_FALLING_EDGE)
 			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE;
-		if (extts_flags & PTP_RISING_EDGE)
+		if (config->flags  & PTP_RISING_EDGE)
 			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_RISING_EDGE;
 
 		/* Write GPIO CTL reg.
@@ -1636,9 +1633,48 @@ ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
 
 	wr32(hw, PFINT_OICR_ENA, irq_reg);
 	wr32(hw, GLTSYN_AUX_IN(chan, tmr_idx), aux_reg);
-	wr32(hw, GLGEN_GPIO_CTL(gpio_pin), gpio_reg);
+	wr32(hw, GLGEN_GPIO_CTL(config->gpio_pin), gpio_reg);
 
-	return 0;
+	if (store)
+		memcpy(&pf->ptp.extts_channels[chan], config, sizeof(*config));
+}
+
+/**
+ * ice_ptp_disable_all_extts - Disable all EXTTS channels
+ * @pf: Board private structure
+ */
+static void ice_ptp_disable_all_extts(struct ice_pf *pf)
+{
+	struct ice_extts_channel extts_cfg = {};
+	int i;
+
+	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
+		if (pf->ptp.extts_channels[i].ena) {
+			extts_cfg.gpio_pin = pf->ptp.extts_channels[i].gpio_pin;
+			extts_cfg.ena = false;
+			ice_ptp_cfg_extts(pf, i, &extts_cfg, false);
+		}
+	}
+
+	synchronize_irq(pf->oicr_irq.virq);
+}
+
+/**
+ * ice_ptp_enable_all_extts - Enable all EXTTS channels
+ * @pf: Board private structure
+ *
+ * Called during reset to restore user configuration.
+ */
+static void ice_ptp_enable_all_extts(struct ice_pf *pf)
+{
+	int i;
+
+	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
+		if (pf->ptp.extts_channels[i].ena) {
+			ice_ptp_cfg_extts(pf, i, &pf->ptp.extts_channels[i],
+					  false);
+		}
+	}
 }
 
 /**
@@ -1795,7 +1831,6 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			 struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	struct ice_perout_channel clk_cfg = {0};
 	bool sma_pres = false;
 	unsigned int chan;
 	u32 gpio_pin;
@@ -1806,6 +1841,9 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PEROUT:
+	{
+		struct ice_perout_channel clk_cfg = {};
+
 		chan = rq->perout.index;
 		if (sma_pres) {
 			if (chan == ice_pin_desc_e810t[SMA1].chan)
@@ -1833,7 +1871,11 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 
 		err = ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
 		break;
+	}
 	case PTP_CLK_REQ_EXTTS:
+	{
+		struct ice_extts_channel extts_cfg = {};
+
 		chan = rq->extts.index;
 		if (sma_pres) {
 			if (chan < ice_pin_desc_e810t[SMA2].chan)
@@ -1849,9 +1891,13 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			gpio_pin = chan;
 		}
 
-		err = ice_ptp_cfg_extts(pf, !!on, chan, gpio_pin,
-					rq->extts.flags);
-		break;
+		extts_cfg.flags = rq->extts.flags;
+		extts_cfg.gpio_pin = gpio_pin;
+		extts_cfg.ena = !!on;
+
+		ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
+		return 0;
+	}
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -1869,21 +1915,31 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 				    struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	struct ice_perout_channel clk_cfg = {0};
 	int err;
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PPS:
+	{
+		struct ice_perout_channel clk_cfg = {};
+
 		clk_cfg.gpio_pin = PPS_PIN_INDEX;
 		clk_cfg.period = NSEC_PER_SEC;
 		clk_cfg.ena = !!on;
 
 		err = ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
 		break;
+	}
 	case PTP_CLK_REQ_EXTTS:
-		err = ice_ptp_cfg_extts(pf, !!on, rq->extts.index,
-					TIME_SYNC_PIN_INDEX, rq->extts.flags);
-		break;
+	{
+		struct ice_extts_channel extts_cfg = {};
+
+		extts_cfg.flags = rq->extts.flags;
+		extts_cfg.gpio_pin = TIME_SYNC_PIN_INDEX;
+		extts_cfg.ena = !!on;
+
+		ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
+		return 0;
+	}
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -2720,6 +2776,10 @@ static int ice_ptp_rebuild_owner(struct ice_pf *pf)
 		ice_ptp_restart_all_phy(pf);
 	}
 
+	/* Re-enable all periodic outputs and external timestamp events */
+	ice_ptp_enable_all_clkout(pf);
+	ice_ptp_enable_all_extts(pf);
+
 	return 0;
 }
 
@@ -3275,6 +3335,8 @@ void ice_ptp_release(struct ice_pf *pf)
 
 	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
 
+	ice_ptp_disable_all_extts(pf);
+
 	kthread_cancel_delayed_work_sync(&pf->ptp.work);
 
 	ice_ptp_port_phy_stop(&pf->ptp.port);
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 3af20025043a..f1171cdd93c8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -33,6 +33,12 @@ struct ice_perout_channel {
 	u64 start_time;
 };
 
+struct ice_extts_channel {
+	bool ena;
+	u32 gpio_pin;
+	u32 flags;
+};
+
 /* The ice hardware captures Tx hardware timestamps in the PHY. The timestamp
  * is stored in a buffer of registers. Depending on the specific hardware,
  * this buffer might be shared across multiple PHY ports.
@@ -226,6 +232,7 @@ enum ice_ptp_state {
  * @ext_ts_irq: the external timestamp IRQ in use
  * @kworker: kwork thread for handling periodic work
  * @perout_channels: periodic output data
+ * @extts_channels: channels for external timestamps
  * @info: structure defining PTP hardware capabilities
  * @clock: pointer to registered PTP clock device
  * @tstamp_config: hardware timestamping configuration
@@ -249,6 +256,7 @@ struct ice_ptp {
 	u8 ext_ts_irq;
 	struct kthread_worker *kworker;
 	struct ice_perout_channel perout_channels[GLTSYN_TGT_H_IDX_MAX];
+	struct ice_extts_channel extts_channels[GLTSYN_TGT_H_IDX_MAX];
 	struct ptp_clock_info info;
 	struct ptp_clock *clock;
 	struct hwtstamp_config tstamp_config;
-- 
2.43.0

[PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Karol Kolacinski]

From: Jacob Keller <jacob.e.keller@intel.com>

The ice_ptp_extts_event() function can race with ice_ptp_release() and
result in a NULL pointer dereference which leads to a kernel panic.

Panic occurs because the ice_ptp_extts_event() function calls
ptp_clock_event() with a NULL pointer. The ice driver has already
released the PTP clock by the time the interrupt for the next external
timestamp event occurs.

To fix this, modify the ice_ptp_extts_event() function to check the
PTP state and bail early if PTP is not ready.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
V1 -> V2: removed unnecessary hunk of code and adjusted commit message

 drivers/net/ethernet/intel/ice/ice_ptp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index d8ff9f26010c..0500ced1adf8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1559,6 +1559,10 @@ void ice_ptp_extts_event(struct ice_pf *pf)
 	u8 chan, tmr_idx;
 	u32 hi, lo;
 
+	/* Don't process timestamp events if PTP is not ready */
+	if (pf->ptp.state != ICE_PTP_READY)
+		return;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 	/* Event time is captured by one of the two matched registers
 	 *      GLTSYN_EVNT_L: 32 LSB of sampled time event
-- 
2.43.0

[PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported flags

[Karol Kolacinski]

From: Jacob Keller <jacob.e.keller@intel.com>

The driver receives requests for configuring pins via the .enable
callback of the PTP clock object. These requests come into the driver
with flags which modify the requested behavior from userspace. Current
implementation in ice does not reject flags that it doesn't support.
This causes the driver to incorrectly apply requests with such flags as
PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it
is not yet aware of.

Fix this by properly validating flags in both ice_ptp_cfg_perout and
ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported
flags rather than just checking and rejecting known un-supported flags.
This is preferable, as it ensures better compatibility with future
kernels.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
V1 -> V2: adjusted indentation and added NULL config pointer check

 drivers/net/ethernet/intel/ice/ice_ptp.c | 38 ++++++++++++++----------
 drivers/net/ethernet/intel/ice/ice_ptp.h |  1 +
 2 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 0500ced1adf8..163b312c7cbc 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1593,14 +1593,23 @@ void ice_ptp_extts_event(struct ice_pf *pf)
  * @store: If set to true, the values will be stored
  *
  * Configure an external timestamp event on the requested channel.
+ *
+ * Return: 0 on success, -EOPNOTUSPP on unsupported flags
  */
-static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
-			      struct ice_extts_channel *config, bool store)
+static int ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
+			     struct ice_extts_channel *config, bool store)
 {
 	u32 func, aux_reg, gpio_reg, irq_reg;
 	struct ice_hw *hw = &pf->hw;
 	u8 tmr_idx;
 
+	/* Reject requests with unsupported flags */
+	if (config->flags & ~(PTP_ENABLE_FEATURE |
+			      PTP_RISING_EDGE |
+			      PTP_FALLING_EDGE |
+			      PTP_STRICT_FLAGS))
+		return -EOPNOTSUPP;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	irq_reg = rd32(hw, PFINT_OICR_ENA);
@@ -1641,6 +1650,8 @@ static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
 
 	if (store)
 		memcpy(&pf->ptp.extts_channels[chan], config, sizeof(*config));
+
+	return 0;
 }
 
 /**
@@ -1699,6 +1710,9 @@ static int ice_ptp_cfg_clkout(struct ice_pf *pf, unsigned int chan,
 	u32 func, val, gpio_pin;
 	u8 tmr_idx;
 
+	if (config && config->flags & ~PTP_PEROUT_PHASE)
+		return -EOPNOTSUPP;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	/* 0. Reset mode & out_en in AUX_OUT */
@@ -1838,7 +1852,6 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 	bool sma_pres = false;
 	unsigned int chan;
 	u32 gpio_pin;
-	int err;
 
 	if (ice_is_feature_supported(pf, ICE_F_SMA_CTRL))
 		sma_pres = true;
@@ -1867,14 +1880,14 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			clk_cfg.gpio_pin = chan;
 		}
 
+		clk_cfg.flags = rq->perout.flags;
 		clk_cfg.period = ((rq->perout.period.sec * NSEC_PER_SEC) +
 				   rq->perout.period.nsec);
 		clk_cfg.start_time = ((rq->perout.start.sec * NSEC_PER_SEC) +
 				       rq->perout.start.nsec);
 		clk_cfg.ena = !!on;
 
-		err = ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
-		break;
+		return ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
 	}
 	case PTP_CLK_REQ_EXTTS:
 	{
@@ -1899,14 +1912,11 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 		extts_cfg.gpio_pin = gpio_pin;
 		extts_cfg.ena = !!on;
 
-		ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
-		return 0;
+		return ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
 	}
 	default:
 		return -EOPNOTSUPP;
 	}
-
-	return err;
 }
 
 /**
@@ -1919,19 +1929,18 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 				    struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	int err;
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PPS:
 	{
 		struct ice_perout_channel clk_cfg = {};
 
+		clk_cfg.flags = rq->perout.flags;
 		clk_cfg.gpio_pin = PPS_PIN_INDEX;
 		clk_cfg.period = NSEC_PER_SEC;
 		clk_cfg.ena = !!on;
 
-		err = ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
-		break;
+		return ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
 	}
 	case PTP_CLK_REQ_EXTTS:
 	{
@@ -1941,14 +1950,11 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 		extts_cfg.gpio_pin = TIME_SYNC_PIN_INDEX;
 		extts_cfg.ena = !!on;
 
-		ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
-		return 0;
+		return ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
 	}
 	default:
 		return -EOPNOTSUPP;
 	}
-
-	return err;
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index f1171cdd93c8..e2af9749061c 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -29,6 +29,7 @@ enum ice_ptp_pin_e810t {
 struct ice_perout_channel {
 	bool ena;
 	u32 gpio_pin;
+	u32 flags;
 	u64 period;
 	u64 start_time;
 };
-- 
2.43.0

Re: [PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported flags

[Simon Horman]

On Thu, Jun 20, 2024 at 02:27:10PM +0200, Karol Kolacinski wrote:
> From: Jacob Keller <jacob.e.keller@intel.com>
> 
> The driver receives requests for configuring pins via the .enable
> callback of the PTP clock object. These requests come into the driver
> with flags which modify the requested behavior from userspace. Current
> implementation in ice does not reject flags that it doesn't support.
> This causes the driver to incorrectly apply requests with such flags as
> PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it
> is not yet aware of.
> 
> Fix this by properly validating flags in both ice_ptp_cfg_perout and
> ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported
> flags rather than just checking and rejecting known un-supported flags.
> This is preferable, as it ensures better compatibility with future
> kernels.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: adjusted indentation and added NULL config pointer check

Thanks for the update, this version looks good to me.

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

Re: [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Simon Horman]

On Thu, Jun 20, 2024 at 02:27:09PM +0200, Karol Kolacinski wrote:
> From: Jacob Keller <jacob.e.keller@intel.com>
> 
> The ice_ptp_extts_event() function can race with ice_ptp_release() and
> result in a NULL pointer dereference which leads to a kernel panic.
> 
> Panic occurs because the ice_ptp_extts_event() function calls
> ptp_clock_event() with a NULL pointer. The ice driver has already
> released the PTP clock by the time the interrupt for the next external
> timestamp event occurs.
> 
> To fix this, modify the ice_ptp_extts_event() function to check the
> PTP state and bail early if PTP is not ready.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: removed unnecessary hunk of code and adjusted commit message

Thanks for the update.

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

Re: [PATCH v2 iwl-net 1/3] ice: Fix improper extts handling

[Simon Horman]

On Thu, Jun 20, 2024 at 02:27:08PM +0200, Karol Kolacinski wrote:
> From: Milena Olech <milena.olech@intel.com>
> 
> Extts events are disabled and enabled by the application ts2phc.
> However, in case where the driver is removed when the application is
> running, channel remains enabled. As a result, in the next run of the
> app, two channels are enabled and the information "extts on unexpected
> channel" is printed to the user.
> 
> To avoid that, extts events shall be disabled when PTP is released.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Milena Olech <milena.olech@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: removed extra space and fixed return value in
>           ice_ptp_gpio_enable_e823()

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

RE: [Intel-wired-lan] [PATCH v2 iwl-net 1/3] ice: Fix improper extts handling

[Pucha, HimasekharX Reddy]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Karol Kolacinski
> Sent: Thursday, June 20, 2024 5:57 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org; Kolacinski, Karol <karol.kolacinski@intel.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@intel.com>; Keller, Jacob E <jacob.e.keller@intel.com>; Olech, Milena <milena.olech@intel.com>
> Subject: [Intel-wired-lan] [PATCH v2 iwl-net 1/3] ice: Fix improper extts handling
>
> From: Milena Olech <milena.olech@intel.com>
>
> Extts events are disabled and enabled by the application ts2phc.
> However, in case where the driver is removed when the application is running, channel remains enabled. As a result, in the next run of the app, two channels are enabled and the information "extts on unexpected channel" is printed to the user.
>
> To avoid that, extts events shall be disabled when PTP is released.
>
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Milena Olech <milena.olech@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: removed extra space and fixed return value in
>           ice_ptp_gpio_enable_e823()
>
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 106 ++++++++++++++++++-----
>  drivers/net/ethernet/intel/ice/ice_ptp.h |   8 ++
>  2 files changed, 92 insertions(+), 22 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)

RE: [Intel-wired-lan] [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Pucha, HimasekharX Reddy]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Karol Kolacinski
> Sent: Thursday, June 20, 2024 5:57 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Keller, Jacob E <jacob.e.keller@intel.com>; netdev@vger.kernel.org; Kolacinski, Karol <karol.kolacinski@intel.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@intel.com>
> Subject: [Intel-wired-lan] [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled
>
> From: Jacob Keller <jacob.e.keller@intel.com>
>
> The ice_ptp_extts_event() function can race with ice_ptp_release() and result in a NULL pointer dereference which leads to a kernel panic.
>
> Panic occurs because the ice_ptp_extts_event() function calls
> ptp_clock_event() with a NULL pointer. The ice driver has already released the PTP clock by the time the interrupt for the next external timestamp event occurs.
>
> To fix this, modify the ice_ptp_extts_event() function to check the PTP state and bail early if PTP is not ready.
>
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: removed unnecessary hunk of code and adjusted commit message
>
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 4 ++++
>  1 file changed, 4 insertions(+)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)

RE: [Intel-wired-lan] [PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported flags

[Pucha, HimasekharX Reddy]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Karol Kolacinski
> Sent: Thursday, June 20, 2024 5:57 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Keller, Jacob E <jacob.e.keller@intel.com>; netdev@vger.kernel.org; Kolacinski, Karol <karol.kolacinski@intel.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@intel.com>
> Subject: [Intel-wired-lan] [PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported flags
>
> From: Jacob Keller <jacob.e.keller@intel.com>
>
> The driver receives requests for configuring pins via the .enable callback of the PTP clock object. These requests come into the driver with flags which modify the requested behavior from userspace. Current implementation in ice does not reject flags that it doesn't support.
> This causes the driver to incorrectly apply requests with such flags as PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it is not yet aware of.
>
> Fix this by properly validating flags in both ice_ptp_cfg_perout and ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported flags rather than just checking and rejecting known un-supported flags.
> This is preferable, as it ensures better compatibility with future kernels.
>
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
> V1 -> V2: adjusted indentation and added NULL config pointer check
>
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 38 ++++++++++++++----------  drivers/net/ethernet/intel/ice/ice_ptp.h |  1 +
>  2 files changed, 23 insertions(+), 16 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)