[Intel-wired-lan] [PATCH 0/6] igc: PTP timestamping fixes

[Intel-wired-lan] [PATCH 0/6] igc: PTP timestamping fixes

[Andre Guedes]

Hi all,

This patch series provides some fixes and improvements to ptp timestamp
handling in IGC driver.

IGC ptp implementation was based on IGB, but there are a few differences on how
I225 handles rx timestamps that need to be considered. For example, I225 doesn't
report rx timestamps via the TS bit rx descriptor + RXSTMPL/RXSTMPH registers
mechanism. They are reported via the packet buffer only.

Apart from that, this patch series also fixes other issues like code
duplication, dummy UDP filter configuration, and missing SRRCTL register clean
up.

Regards,

Andre

Andre Guedes (6):
  igc: Clean up rx timestamping logic
  igc: Remove duplicate code in tx timestamp handling
  igc: Check __IGC_PTP_TX_IN_PROGRESS instead of ptp_tx_skb
  igc: Remove UDP filter setup in PTP code
  igc: Refactor igc_ptp_set_timestamp_mode()
  igc: Fix rx timestamp disabling

 drivers/net/ethernet/intel/igc/igc.h         |   3 -
 drivers/net/ethernet/intel/igc/igc_defines.h |   2 -
 drivers/net/ethernet/intel/igc/igc_main.c    |  12 +-
 drivers/net/ethernet/intel/igc/igc_ptp.c     | 256 +++++--------------
 drivers/net/ethernet/intel/igc/igc_regs.h    |   2 -
 5 files changed, 75 insertions(+), 200 deletions(-)

-- 
2.26.2

[Intel-wired-lan] [PATCH 1/6] igc: Clean up rx timestamping logic

[Andre Guedes]

Differently from I210, I225 doesn't report rx timestamps via the TS bit
rx descriptor + RXSTMPL/RXSTMPH registers mechanism. Rx timestamps are
reported in the packet buffer only, which is implemented by igc_ptp_rx_
pktstamp(). So this patch removes igc_ptp_rx_rgtstamp() and all code
related to it, copied from igb driver.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc.h         |  3 --
 drivers/net/ethernet/intel/igc/igc_defines.h |  2 -
 drivers/net/ethernet/intel/igc/igc_main.c    | 12 ++----
 drivers/net/ethernet/intel/igc/igc_ptp.c     | 44 +-------------------
 drivers/net/ethernet/intel/igc/igc_regs.h    |  2 -
 5 files changed, 5 insertions(+), 58 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 9c57afad6afe..3070dfdb7eb4 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -210,8 +210,6 @@ struct igc_adapter {
 	struct sk_buff *ptp_tx_skb;
 	struct hwtstamp_config tstamp_config;
 	unsigned long ptp_tx_start;
-	unsigned long last_rx_ptp_check;
-	unsigned long last_rx_timestamp;
 	unsigned int ptp_flags;
 	/* System time value lock */
 	spinlock_t tmreg_lock;
@@ -549,7 +547,6 @@ void igc_ptp_init(struct igc_adapter *adapter);
 void igc_ptp_reset(struct igc_adapter *adapter);
 void igc_ptp_suspend(struct igc_adapter *adapter);
 void igc_ptp_stop(struct igc_adapter *adapter);
-void igc_ptp_rx_rgtstamp(struct igc_q_vector *q_vector, struct sk_buff *skb);
 void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, void *va,
 			 struct sk_buff *skb);
 int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr);
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 81df6de2b206..1c032c1ce4d3 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -323,7 +323,6 @@
 
 /* Advanced Receive Descriptor bit definitions */
 #define IGC_RXDADV_STAT_TSIP	0x08000 /* timestamp in packet */
-#define IGC_RXDADV_STAT_TS	0x10000 /* Pkt was time stamped */
 
 #define IGC_RXDEXT_STATERR_CE		0x01000000
 #define IGC_RXDEXT_STATERR_SE		0x02000000
@@ -384,7 +383,6 @@
 #define IGC_FTQF_MASK_PROTO_BP	0x10000000
 
 /* Time Sync Receive Control bit definitions */
-#define IGC_TSYNCRXCTL_VALID		0x00000001  /* Rx timestamp valid */
 #define IGC_TSYNCRXCTL_TYPE_MASK	0x0000000E  /* Rx type mask */
 #define IGC_TSYNCRXCTL_TYPE_L2_V2	0x00
 #define IGC_TSYNCRXCTL_TYPE_L4_V1	0x02
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index c767f5326ac9..4412ff573bcd 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1480,9 +1480,9 @@ static inline void igc_rx_hash(struct igc_ring *ring,
  * @rx_desc: pointer to the EOP Rx descriptor
  * @skb: pointer to current skb being populated
  *
- * This function checks the ring, descriptor, and packet information in
- * order to populate the hash, checksum, VLAN, timestamp, protocol, and
- * other fields within the skb.
+ * This function checks the ring, descriptor, and packet information in order
+ * to populate the hash, checksum, VLAN, protocol, and other fields within the
+ * skb.
  */
 static void igc_process_skb_fields(struct igc_ring *rx_ring,
 				   union igc_adv_rx_desc *rx_desc,
@@ -1492,10 +1492,6 @@ static void igc_process_skb_fields(struct igc_ring *rx_ring,
 
 	igc_rx_checksum(rx_ring, rx_desc, skb);
 
-	if (igc_test_staterr(rx_desc, IGC_RXDADV_STAT_TS) &&
-	    !igc_test_staterr(rx_desc, IGC_RXDADV_STAT_TSIP))
-		igc_ptp_rx_rgtstamp(rx_ring->q_vector, skb);
-
 	skb_record_rx_queue(skb, rx_ring->queue_index);
 
 	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
@@ -1976,7 +1972,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
 		/* probably a little skewed due to removing CRC */
 		total_bytes += skb->len;
 
-		/* populate checksum, timestamp, VLAN, and protocol */
+		/* populate checksum, VLAN, and protocol */
 		igc_process_skb_fields(rx_ring, rx_desc, skb);
 
 		napi_gro_receive(&q_vector->napi, skb);
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 0d746f8588c8..82e6c6c962d5 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -205,46 +205,6 @@ void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, void *va,
 		ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust);
 }
 
-/**
- * igc_ptp_rx_rgtstamp - retrieve Rx timestamp stored in register
- * @q_vector: Pointer to interrupt specific structure
- * @skb: Buffer containing timestamp and packet
- *
- * This function is meant to retrieve a timestamp from the internal registers
- * of the adapter and store it in the skb.
- */
-void igc_ptp_rx_rgtstamp(struct igc_q_vector *q_vector,
-			 struct sk_buff *skb)
-{
-	struct igc_adapter *adapter = q_vector->adapter;
-	struct igc_hw *hw = &adapter->hw;
-	u64 regval;
-
-	/* If this bit is set, then the RX registers contain the time
-	 * stamp. No other packet will be time stamped until we read
-	 * these registers, so read the registers to make them
-	 * available again. Because only one packet can be time
-	 * stamped at a time, we know that the register values must
-	 * belong to this one here and therefore we don't need to
-	 * compare any of the additional attributes stored for it.
-	 *
-	 * If nothing went wrong, then it should have a shared
-	 * tx_flags that we can turn into a skb_shared_hwtstamps.
-	 */
-	if (!(rd32(IGC_TSYNCRXCTL) & IGC_TSYNCRXCTL_VALID))
-		return;
-
-	regval = rd32(IGC_RXSTMPL);
-	regval |= (u64)rd32(IGC_RXSTMPH) << 32;
-
-	igc_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
-
-	/* Update the last_rx_timestamp timer in order to enable watchdog check
-	 * for error case of latched timestamp on a dropped packet.
-	 */
-	adapter->last_rx_timestamp = jiffies;
-}
-
 /**
  * igc_ptp_enable_tstamp_rxqueue - Enable RX timestamp for a queue
  * @rx_ring: Pointer to RX queue
@@ -419,11 +379,9 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	}
 	wrfl();
 
-	/* clear TX/RX time stamp registers, just to be sure */
+	/* clear TX time stamp registers, just to be sure */
 	regval = rd32(IGC_TXSTMPL);
 	regval = rd32(IGC_TXSTMPH);
-	regval = rd32(IGC_RXSTMPL);
-	regval = rd32(IGC_RXSTMPH);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/igc/igc_regs.h b/drivers/net/ethernet/intel/igc/igc_regs.h
index 97f9b928509f..d53f49833db5 100644
--- a/drivers/net/ethernet/intel/igc/igc_regs.h
+++ b/drivers/net/ethernet/intel/igc/igc_regs.h
@@ -228,8 +228,6 @@
 #define IGC_SYSTIMR	0x0B6F8  /* System time register Residue */
 #define IGC_TIMINCA	0x0B608  /* Increment attributes register - RW */
 
-#define IGC_RXSTMPL	0x0B624  /* Rx timestamp Low - RO */
-#define IGC_RXSTMPH	0x0B628  /* Rx timestamp High - RO */
 #define IGC_TXSTMPL	0x0B618  /* Tx timestamp value Low - RO */
 #define IGC_TXSTMPH	0x0B61C  /* Tx timestamp value High - RO */
 
-- 
2.26.2

[Intel-wired-lan] [PATCH 2/6] igc: Remove duplicate code in tx timestamp handling

[Andre Guedes]

The functions igc_ptp_tx_hang() and igc_ptp_tx_work() have duplicate
code which handles tx timestamp timeouts. This patch does a trivial
refactoring by moving that code to its own function and reusing it.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 34 +++++++++++-------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 82e6c6c962d5..b1b23c6bf689 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -386,11 +386,23 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	return 0;
 }
 
+static void igc_ptp_tx_timeout(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+
+	dev_kfree_skb_any(adapter->ptp_tx_skb);
+	adapter->ptp_tx_skb = NULL;
+	adapter->tx_hwtstamp_timeouts++;
+	clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
+	/* Clear the tx valid bit in TSYNCTXCTL register to enable interrupt. */
+	rd32(IGC_TXSTMPH);
+	netdev_warn(adapter->netdev, "Tx timestamp timeout\n");
+}
+
 void igc_ptp_tx_hang(struct igc_adapter *adapter)
 {
 	bool timeout = time_is_before_jiffies(adapter->ptp_tx_start +
 					      IGC_PTP_TX_TIMEOUT);
-	struct igc_hw *hw = &adapter->hw;
 
 	if (!adapter->ptp_tx_skb)
 		return;
@@ -404,15 +416,7 @@ void igc_ptp_tx_hang(struct igc_adapter *adapter)
 	 */
 	if (timeout) {
 		cancel_work_sync(&adapter->ptp_tx_work);
-		dev_kfree_skb_any(adapter->ptp_tx_skb);
-		adapter->ptp_tx_skb = NULL;
-		clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
-		adapter->tx_hwtstamp_timeouts++;
-		/* Clear the Tx valid bit in TSYNCTXCTL register to enable
-		 * interrupt
-		 */
-		rd32(IGC_TXSTMPH);
-		netdev_warn(adapter->netdev, "Clearing Tx timestamp hang\n");
+		igc_ptp_tx_timeout(adapter);
 	}
 }
 
@@ -467,15 +471,7 @@ static void igc_ptp_tx_work(struct work_struct *work)
 
 	if (time_is_before_jiffies(adapter->ptp_tx_start +
 				   IGC_PTP_TX_TIMEOUT)) {
-		dev_kfree_skb_any(adapter->ptp_tx_skb);
-		adapter->ptp_tx_skb = NULL;
-		clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
-		adapter->tx_hwtstamp_timeouts++;
-		/* Clear the tx valid bit in TSYNCTXCTL register to enable
-		 * interrupt
-		 */
-		rd32(IGC_TXSTMPH);
-		netdev_warn(adapter->netdev, "Clearing Tx timestamp hang\n");
+		igc_ptp_tx_timeout(adapter);
 		return;
 	}
 
-- 
2.26.2

[Intel-wired-lan] [PATCH 3/6] igc: Check __IGC_PTP_TX_IN_PROGRESS instead of ptp_tx_skb

[Andre Guedes]

The __IGC_PTP_TX_IN_PROGRESS flag indicates we have a pending tx
timestamp. In some places, instead of checking that flag, we check
adapter->ptp_tx_skb. This patch fixes those places to use the flag.

Quick note about igc_ptp_tx_hwtstamp() change: when that function is
called, adapter->ptp_tx_skb is expected to be valid always so we
WARN_ON_ONCE() in case it is not.

Quick note about igc_ptp_suspend() change: when suspending, we don't
really need to check if there is a pending timestamp. We can simply
clear it unconditionally.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index b1b23c6bf689..e65fdcf966b2 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -404,9 +404,6 @@ void igc_ptp_tx_hang(struct igc_adapter *adapter)
 	bool timeout = time_is_before_jiffies(adapter->ptp_tx_start +
 					      IGC_PTP_TX_TIMEOUT);
 
-	if (!adapter->ptp_tx_skb)
-		return;
-
 	if (!test_bit(__IGC_PTP_TX_IN_PROGRESS, &adapter->state))
 		return;
 
@@ -435,6 +432,9 @@ static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter)
 	struct igc_hw *hw = &adapter->hw;
 	u64 regval;
 
+	if (WARN_ON_ONCE(!skb))
+		return;
+
 	regval = rd32(IGC_TXSTMPL);
 	regval |= (u64)rd32(IGC_TXSTMPH) << 32;
 	igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
@@ -466,7 +466,7 @@ static void igc_ptp_tx_work(struct work_struct *work)
 	struct igc_hw *hw = &adapter->hw;
 	u32 tsynctxctl;
 
-	if (!adapter->ptp_tx_skb)
+	if (!test_bit(__IGC_PTP_TX_IN_PROGRESS, &adapter->state))
 		return;
 
 	if (time_is_before_jiffies(adapter->ptp_tx_start +
@@ -588,11 +588,9 @@ void igc_ptp_suspend(struct igc_adapter *adapter)
 		return;
 
 	cancel_work_sync(&adapter->ptp_tx_work);
-	if (adapter->ptp_tx_skb) {
-		dev_kfree_skb_any(adapter->ptp_tx_skb);
-		adapter->ptp_tx_skb = NULL;
-		clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
-	}
+	dev_kfree_skb_any(adapter->ptp_tx_skb);
+	adapter->ptp_tx_skb = NULL;
+	clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
 }
 
 /**
-- 
2.26.2

[Intel-wired-lan] [PATCH 4/6] igc: Remove UDP filter setup in PTP code

[Andre Guedes]

As implemented in igc_ethtool_get_ts_info(), igc only supports HWTSTAMP_
FILTER_ALL so any HWTSTAMP_FILTER_* option the user may set falls back to
HWTSTAMP_FILTER_ALL.

HWTSTAMP_FILTER_ALL is implemented via Rx Time Sync Control (TSYNCRXCTL)
configuration which timestamps all incoming packets. Configuring an
UDP filter, in addition to TSYNCRXCTL, doesn't add much so this patch
removes that code. It also takes this opportunity to remove some
non-applicable comments.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 51 +-----------------------
 1 file changed, 1 insertion(+), 50 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index e65fdcf966b2..bdf934377abb 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -244,18 +244,7 @@ static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter,
  * @adapter: networking device structure
  * @config: hwtstamp configuration
  *
- * Outgoing time stamping can be enabled and disabled. Play nice and
- * disable it when requested, although it shouldn't case any overhead
- * when no packet needs it. At most one packet in the queue may be
- * marked for time stamping, otherwise it would be impossible to tell
- * for sure to which packet the hardware time stamp belongs.
- *
- * Incoming time stamping has to be configured via the hardware
- * filters. Not all combinations are supported, in particular event
- * type has to be specified. Matching the kind of event packet is
- * not supported, with the exception of "all V2 events regardless of
- * level 2 or 4".
- *
+ * Return: 0 in case of success, negative errno code otherwise.
  */
 static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 				      struct hwtstamp_config *config)
@@ -263,8 +252,6 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	u32 tsync_tx_ctl = IGC_TSYNCTXCTL_ENABLED;
 	u32 tsync_rx_ctl = IGC_TSYNCRXCTL_ENABLED;
 	struct igc_hw *hw = &adapter->hw;
-	u32 tsync_rx_cfg = 0;
-	bool is_l4 = false;
 	u32 regval;
 
 	/* reserved for future extensions */
@@ -285,15 +272,7 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 		tsync_rx_ctl = 0;
 		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_L4_V1;
-		tsync_rx_cfg = IGC_TSYNCRXCFG_PTP_V1_SYNC_MESSAGE;
-		is_l4 = true;
-		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_L4_V1;
-		tsync_rx_cfg = IGC_TSYNCRXCFG_PTP_V1_DELAY_REQ_MESSAGE;
-		is_l4 = true;
-		break;
 	case HWTSTAMP_FILTER_PTP_V2_EVENT:
 	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
@@ -303,32 +282,22 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_EVENT_V2;
-		config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
-		is_l4 = true;
-		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 	case HWTSTAMP_FILTER_NTP_ALL:
 	case HWTSTAMP_FILTER_ALL:
 		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_ALL;
 		config->rx_filter = HWTSTAMP_FILTER_ALL;
 		break;
-		/* fall through */
 	default:
 		config->rx_filter = HWTSTAMP_FILTER_NONE;
 		return -ERANGE;
 	}
 
-	/* Per-packet timestamping only works if all packets are
-	 * timestamped, so enable timestamping in all packets as long
-	 * as one Rx filter was configured.
-	 */
 	if (tsync_rx_ctl) {
 		tsync_rx_ctl = IGC_TSYNCRXCTL_ENABLED;
 		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_ALL;
 		tsync_rx_ctl |= IGC_TSYNCRXCTL_RXSYNSIG;
 		config->rx_filter = HWTSTAMP_FILTER_ALL;
-		is_l4 = true;
 
 		if (hw->mac.type == igc_i225) {
 			regval = rd32(IGC_RXPBS);
@@ -359,24 +328,6 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	regval |= tsync_rx_ctl;
 	wr32(IGC_TSYNCRXCTL, regval);
 
-	/* define which PTP packets are time stamped */
-	wr32(IGC_TSYNCRXCFG, tsync_rx_cfg);
-
-	/* L4 Queue Filter[3]: filter by destination port and protocol */
-	if (is_l4) {
-		u32 ftqf = (IPPROTO_UDP /* UDP */
-			    | IGC_FTQF_VF_BP /* VF not compared */
-			    | IGC_FTQF_1588_TIME_STAMP /* Enable Timestamp */
-			    | IGC_FTQF_MASK); /* mask all inputs */
-		ftqf &= ~IGC_FTQF_MASK_PROTO_BP; /* enable protocol check */
-
-		wr32(IGC_IMIR(3), htons(PTP_EV_PORT));
-		wr32(IGC_IMIREXT(3),
-		     (IGC_IMIREXT_SIZE_BP | IGC_IMIREXT_CTRL_BP));
-		wr32(IGC_FTQF(3), ftqf);
-	} else {
-		wr32(IGC_FTQF(3), IGC_FTQF_MASK);
-	}
 	wrfl();
 
 	/* clear TX time stamp registers, just to be sure */
-- 
2.26.2

[Intel-wired-lan] [PATCH 5/6] igc: Refactor igc_ptp_set_timestamp_mode()

[Andre Guedes]

Current igc_ptp_set_timestamp_mode() logic is a bit tangled since it
handles many different hardware configurations in one single place,
making it harder to follow. This patch untangles that code by breaking
it into helper functions.

Quick note about the hw->mac.type check which was removed in this
refactoring: this check it not really needed since igc_i225 is the only
type supported by the IGC driver.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 103 ++++++++++++-----------
 1 file changed, 53 insertions(+), 50 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index bdf934377abb..0251e6bedac4 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -239,6 +239,54 @@ static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter,
 	}
 }
 
+static void igc_ptp_disable_rx_timestamp(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 val;
+
+	wr32(IGC_TSYNCRXCTL, 0);
+
+	val = rd32(IGC_RXPBS);
+	val &= ~IGC_RXPBS_CFG_TS_EN;
+	wr32(IGC_RXPBS, val);
+}
+
+static void igc_ptp_enable_rx_timestamp(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 val;
+
+	val = rd32(IGC_RXPBS);
+	val |= IGC_RXPBS_CFG_TS_EN;
+	wr32(IGC_RXPBS, val);
+
+	/* FIXME: For now, only support retrieving RX timestamps from timer 0
+	 */
+	igc_ptp_enable_tstamp_all_rxqueues(adapter, 0);
+
+	val = IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_ALL |
+	      IGC_TSYNCRXCTL_RXSYNSIG;
+	wr32(IGC_TSYNCRXCTL, val);
+}
+
+static void igc_ptp_disable_tx_timestamp(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+
+	wr32(IGC_TSYNCTXCTL, 0);
+}
+
+static void igc_ptp_enable_tx_timestamp(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+
+	wr32(IGC_TSYNCTXCTL, IGC_TSYNCTXCTL_ENABLED | IGC_TSYNCTXCTL_TXSYNSIG);
+
+	/* Read TXSTMP registers to discard any timestamp previously stored. */
+	rd32(IGC_TXSTMPL);
+	rd32(IGC_TXSTMPH);
+}
+
 /**
  * igc_ptp_set_timestamp_mode - setup hardware for timestamping
  * @adapter: networking device structure
@@ -249,19 +297,16 @@ static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter,
 static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 				      struct hwtstamp_config *config)
 {
-	u32 tsync_tx_ctl = IGC_TSYNCTXCTL_ENABLED;
-	u32 tsync_rx_ctl = IGC_TSYNCRXCTL_ENABLED;
-	struct igc_hw *hw = &adapter->hw;
-	u32 regval;
-
 	/* reserved for future extensions */
 	if (config->flags)
 		return -EINVAL;
 
 	switch (config->tx_type) {
 	case HWTSTAMP_TX_OFF:
-		tsync_tx_ctl = 0;
+		igc_ptp_disable_tx_timestamp(adapter);
+		break;
 	case HWTSTAMP_TX_ON:
+		igc_ptp_enable_tx_timestamp(adapter);
 		break;
 	default:
 		return -ERANGE;
@@ -269,7 +314,7 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 
 	switch (config->rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
-		tsync_rx_ctl = 0;
+		igc_ptp_disable_rx_timestamp(adapter);
 		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
@@ -285,55 +330,13 @@ static int igc_ptp_set_timestamp_mode(struct igc_adapter *adapter,
 	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 	case HWTSTAMP_FILTER_NTP_ALL:
 	case HWTSTAMP_FILTER_ALL:
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_ALL;
+		igc_ptp_enable_rx_timestamp(adapter);
 		config->rx_filter = HWTSTAMP_FILTER_ALL;
 		break;
 	default:
-		config->rx_filter = HWTSTAMP_FILTER_NONE;
 		return -ERANGE;
 	}
 
-	if (tsync_rx_ctl) {
-		tsync_rx_ctl = IGC_TSYNCRXCTL_ENABLED;
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_TYPE_ALL;
-		tsync_rx_ctl |= IGC_TSYNCRXCTL_RXSYNSIG;
-		config->rx_filter = HWTSTAMP_FILTER_ALL;
-
-		if (hw->mac.type == igc_i225) {
-			regval = rd32(IGC_RXPBS);
-			regval |= IGC_RXPBS_CFG_TS_EN;
-			wr32(IGC_RXPBS, regval);
-
-			/* FIXME: For now, only support retrieving RX
-			 * timestamps from timer 0
-			 */
-			igc_ptp_enable_tstamp_all_rxqueues(adapter, 0);
-		}
-	}
-
-	if (tsync_tx_ctl) {
-		tsync_tx_ctl = IGC_TSYNCTXCTL_ENABLED;
-		tsync_tx_ctl |= IGC_TSYNCTXCTL_TXSYNSIG;
-	}
-
-	/* enable/disable TX */
-	regval = rd32(IGC_TSYNCTXCTL);
-	regval &= ~IGC_TSYNCTXCTL_ENABLED;
-	regval |= tsync_tx_ctl;
-	wr32(IGC_TSYNCTXCTL, regval);
-
-	/* enable/disable RX */
-	regval = rd32(IGC_TSYNCRXCTL);
-	regval &= ~(IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_MASK);
-	regval |= tsync_rx_ctl;
-	wr32(IGC_TSYNCRXCTL, regval);
-
-	wrfl();
-
-	/* clear TX time stamp registers, just to be sure */
-	regval = rd32(IGC_TXSTMPL);
-	regval = rd32(IGC_TXSTMPH);
-
 	return 0;
 }
 
-- 
2.26.2

[Intel-wired-lan] [PATCH 6/6] igc: Fix rx timestamp disabling

[Andre Guedes]

When rx timestamping is enabled, we set the timestamp bit in SRRCTL
register for each queue, but we don't clear it when disabling. This
patch fixes igc_ptp_disable_rx_timestamp() accordingly.

Also, this patch gets rid of igc_ptp_enable_tstamp_rxqueue() and
igc_ptp_enable_tstamp_all_rxqueues() and move their logic into
igc_ptp_enable_rx_timestamp() to keep the enable and disable
helpers symmetric.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 54 ++++++++----------------
 1 file changed, 17 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 0251e6bedac4..e67d4655b47e 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -205,47 +205,20 @@ void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, void *va,
 		ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust);
 }
 
-/**
- * igc_ptp_enable_tstamp_rxqueue - Enable RX timestamp for a queue
- * @rx_ring: Pointer to RX queue
- * @timer: Index for timer
- *
- * This function enables RX timestamping for a queue, and selects
- * which 1588 timer will provide the timestamp.
- */
-static void igc_ptp_enable_tstamp_rxqueue(struct igc_adapter *adapter,
-					  struct igc_ring *rx_ring, u8 timer)
-{
-	struct igc_hw *hw = &adapter->hw;
-	int reg_idx = rx_ring->reg_idx;
-	u32 srrctl = rd32(IGC_SRRCTL(reg_idx));
-
-	srrctl |= IGC_SRRCTL_TIMESTAMP;
-	srrctl |= IGC_SRRCTL_TIMER1SEL(timer);
-	srrctl |= IGC_SRRCTL_TIMER0SEL(timer);
-
-	wr32(IGC_SRRCTL(reg_idx), srrctl);
-}
-
-static void igc_ptp_enable_tstamp_all_rxqueues(struct igc_adapter *adapter,
-					       u8 timer)
-{
-	int i;
-
-	for (i = 0; i < adapter->num_rx_queues; i++) {
-		struct igc_ring *ring = adapter->rx_ring[i];
-
-		igc_ptp_enable_tstamp_rxqueue(adapter, ring, timer);
-	}
-}
-
 static void igc_ptp_disable_rx_timestamp(struct igc_adapter *adapter)
 {
 	struct igc_hw *hw = &adapter->hw;
 	u32 val;
+	int i;
 
 	wr32(IGC_TSYNCRXCTL, 0);
 
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		val = rd32(IGC_SRRCTL(i));
+		val &= ~IGC_SRRCTL_TIMESTAMP;
+		wr32(IGC_SRRCTL(i), val);
+	}
+
 	val = rd32(IGC_RXPBS);
 	val &= ~IGC_RXPBS_CFG_TS_EN;
 	wr32(IGC_RXPBS, val);
@@ -255,14 +228,21 @@ static void igc_ptp_enable_rx_timestamp(struct igc_adapter *adapter)
 {
 	struct igc_hw *hw = &adapter->hw;
 	u32 val;
+	int i;
 
 	val = rd32(IGC_RXPBS);
 	val |= IGC_RXPBS_CFG_TS_EN;
 	wr32(IGC_RXPBS, val);
 
-	/* FIXME: For now, only support retrieving RX timestamps from timer 0
-	 */
-	igc_ptp_enable_tstamp_all_rxqueues(adapter, 0);
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		val = rd32(IGC_SRRCTL(i));
+		/* FIXME: For now, only support retrieving RX timestamps from
+		 * timer 0.
+		 */
+		val |= IGC_SRRCTL_TIMER1SEL(0) | IGC_SRRCTL_TIMER0SEL(0) |
+		       IGC_SRRCTL_TIMESTAMP;
+		wr32(IGC_SRRCTL(i), val);
+	}
 
 	val = IGC_TSYNCRXCTL_ENABLED | IGC_TSYNCRXCTL_TYPE_ALL |
 	      IGC_TSYNCRXCTL_RXSYNSIG;
-- 
2.26.2

[Intel-wired-lan] [PATCH 1/6] igc: Clean up rx timestamping logic

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 1/6] igc: Clean up rx timestamping logic
> 
> Differently from I210, I225 doesn't report rx timestamps via the TS bit
> rx descriptor + RXSTMPL/RXSTMPH registers mechanism. Rx timestamps are
> reported in the packet buffer only, which is implemented by igc_ptp_rx_
> pktstamp(). So this patch removes igc_ptp_rx_rgtstamp() and all code
> related to it, copied from igb driver.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc.h         |  3 --
>  drivers/net/ethernet/intel/igc/igc_defines.h |  2 -
>  drivers/net/ethernet/intel/igc/igc_main.c    | 12 ++----
>  drivers/net/ethernet/intel/igc/igc_ptp.c     | 44 +-------------------
>  drivers/net/ethernet/intel/igc/igc_regs.h    |  2 -
>  5 files changed, 5 insertions(+), 58 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [PATCH 2/6] igc: Remove duplicate code in tx timestamp handling

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 2/6] igc: Remove duplicate code in tx
> timestamp handling
> 
> The functions igc_ptp_tx_hang() and igc_ptp_tx_work() have duplicate
> code which handles tx timestamp timeouts. This patch does a trivial
> refactoring by moving that code to its own function and reusing it.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 34 +++++++++++-------------
>  1 file changed, 15 insertions(+), 19 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [PATCH 3/6] igc: Check __IGC_PTP_TX_IN_PROGRESS instead of ptp_tx_skb

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 3/6] igc: Check
> __IGC_PTP_TX_IN_PROGRESS instead of ptp_tx_skb
> 
> The __IGC_PTP_TX_IN_PROGRESS flag indicates we have a pending tx
> timestamp. In some places, instead of checking that flag, we check
> adapter->ptp_tx_skb. This patch fixes those places to use the flag.
> 
> Quick note about igc_ptp_tx_hwtstamp() change: when that function is
> called, adapter->ptp_tx_skb is expected to be valid always so we
> WARN_ON_ONCE() in case it is not.
> 
> Quick note about igc_ptp_suspend() change: when suspending, we don't
> really need to check if there is a pending timestamp. We can simply
> clear it unconditionally.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [PATCH 4/6] igc: Remove UDP filter setup in PTP code

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 4/6] igc: Remove UDP filter setup in PTP
> code
> 
> As implemented in igc_ethtool_get_ts_info(), igc only supports
> HWTSTAMP_
> FILTER_ALL so any HWTSTAMP_FILTER_* option the user may set falls back
> to
> HWTSTAMP_FILTER_ALL.
> 
> HWTSTAMP_FILTER_ALL is implemented via Rx Time Sync Control
> (TSYNCRXCTL)
> configuration which timestamps all incoming packets. Configuring an
> UDP filter, in addition to TSYNCRXCTL, doesn't add much so this patch
> removes that code. It also takes this opportunity to remove some
> non-applicable comments.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 51 +-----------------------
>  1 file changed, 1 insertion(+), 50 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [PATCH 5/6] igc: Refactor igc_ptp_set_timestamp_mode()

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 5/6] igc: Refactor
> igc_ptp_set_timestamp_mode()
> 
> Current igc_ptp_set_timestamp_mode() logic is a bit tangled since it
> handles many different hardware configurations in one single place,
> making it harder to follow. This patch untangles that code by breaking
> it into helper functions.
> 
> Quick note about the hw->mac.type check which was removed in this
> refactoring: this check it not really needed since igc_i225 is the only
> type supported by the IGC driver.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 103 ++++++++++++-----------
>  1 file changed, 53 insertions(+), 50 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

[Intel-wired-lan] [PATCH 6/6] igc: Fix rx timestamp disabling

[Brown, Aaron F]

> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Andre Guedes
> Sent: Wednesday, June 3, 2020 5:01 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH 6/6] igc: Fix rx timestamp disabling
> 
> When rx timestamping is enabled, we set the timestamp bit in SRRCTL
> register for each queue, but we don't clear it when disabling. This
> patch fixes igc_ptp_disable_rx_timestamp() accordingly.
> 
> Also, this patch gets rid of igc_ptp_enable_tstamp_rxqueue() and
> igc_ptp_enable_tstamp_all_rxqueues() and move their logic into
> igc_ptp_enable_rx_timestamp() to keep the enable and disable
> helpers symmetric.
> 
> Signed-off-by: Andre Guedes <andre.guedes@intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 54 ++++++++----------------
>  1 file changed, 17 insertions(+), 37 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@intel.com>