netdev - [PATCH v4 iwl-next 04/11] ice: rename verify_cached to has_ready

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Date: Tue, 29 Aug 2023 12:40:34 +0200
From: Karol Kolacinski <karol.kolacinski@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com,
	jesse.brandeburg@...el.com,
	Jacob Keller <jacob.e.keller@...el.com>,
	Karol Kolacinski <karol.kolacinski@...el.com>
Subject: [PATCH v4 iwl-next 04/11] ice: rename verify_cached to has_ready_bitmap

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

The tx->verify_cached flag is used to inform the Tx timestamp tracking
code whether it needs to verify the cached Tx timestamp value against
a previous captured value. This is necessary on E810 hardware which does
not have a Tx timestamp ready bitmap.

In addition, we currently rely on the fact that the
ice_get_phy_tx_tstamp_ready() function returns all 1s for E810 hardware.
Instead of introducing a brand new flag, rename and verify_cached to
has_ready_bitmap, inverting the relevant checks.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c | 19 +++++++++++--------
 drivers/net/ethernet/intel/ice/ice_ptp.h |  8 +++++---
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index a9c5552dd0d3..f513bbbba9f8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -591,9 +591,11 @@ static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
 	hw = &pf->hw;
 
 	/* Read the Tx ready status first */
-	err = ice_get_phy_tx_tstamp_ready(hw, tx->block, &tstamp_ready);
-	if (err)
-		return;
+	if (tx->has_ready_bitmap) {
+		err = ice_get_phy_tx_tstamp_ready(hw, tx->block, &tstamp_ready);
+		if (err)
+			return;
+	}
 
 	/* Drop packets if the link went down */
 	link_up = ptp_port->link_up;
@@ -621,7 +623,8 @@ static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
 		 * If we do not, the hardware logic for generating a new
 		 * interrupt can get stuck on some devices.
 		 */
-		if (!(tstamp_ready & BIT_ULL(phy_idx))) {
+		if (tx->has_ready_bitmap &&
+		    !(tstamp_ready & BIT_ULL(phy_idx))) {
 			if (drop_ts)
 				goto skip_ts_read;
 
@@ -641,7 +644,7 @@ static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
 		 * from the last cached timestamp. If it is not, skip this for
 		 * now assuming it hasn't yet been captured by hardware.
 		 */
-		if (!drop_ts && tx->verify_cached &&
+		if (!drop_ts && !tx->has_ready_bitmap &&
 		    raw_tstamp == tx->tstamps[idx].cached_tstamp)
 			continue;
 
@@ -651,7 +654,7 @@ static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
 
 skip_ts_read:
 		spin_lock(&tx->lock);
-		if (tx->verify_cached && raw_tstamp)
+		if (!tx->has_ready_bitmap && raw_tstamp)
 			tx->tstamps[idx].cached_tstamp = raw_tstamp;
 		clear_bit(idx, tx->in_use);
 		skb = tx->tstamps[idx].skb;
@@ -895,7 +898,7 @@ ice_ptp_init_tx_e822(struct ice_pf *pf, struct ice_ptp_tx *tx, u8 port)
 	tx->block = port / ICE_PORTS_PER_QUAD;
 	tx->offset = (port % ICE_PORTS_PER_QUAD) * INDEX_PER_PORT_E822;
 	tx->len = INDEX_PER_PORT_E822;
-	tx->verify_cached = 0;
+	tx->has_ready_bitmap = 1;
 
 	return ice_ptp_alloc_tx_tracker(tx);
 }
@@ -918,7 +921,7 @@ ice_ptp_init_tx_e810(struct ice_pf *pf, struct ice_ptp_tx *tx)
 	 * verify new timestamps against cached copy of the last read
 	 * timestamp.
 	 */
-	tx->verify_cached = 1;
+	tx->has_ready_bitmap = 0;
 
 	return ice_ptp_alloc_tx_tracker(tx);
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 48c0d56c0568..f8fd8e00bbc8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -100,7 +100,7 @@ struct ice_perout_channel {
  * the last timestamp we read for a given index. If the current timestamp
  * value is the same as the cached value, we assume a new timestamp hasn't
  * been captured. This avoids reporting stale timestamps to the stack. This is
- * only done if the verify_cached flag is set in ice_ptp_tx structure.
+ * only done if the has_ready_bitmap flag is not set in ice_ptp_tx structure.
  */
 struct ice_tx_tstamp {
 	struct sk_buff *skb;
@@ -130,7 +130,9 @@ enum ice_tx_tstamp_work {
  * @init: if true, the tracker is initialized;
  * @calibrating: if true, the PHY is calibrating the Tx offset. During this
  *               window, timestamps are temporarily disabled.
- * @verify_cached: if true, verify new timestamp differs from last read value
+ * @has_ready_bitmap: if true, the hardware has a valid Tx timestamp ready
+ *                    bitmap register. If false, fall back to verifying new
+ *                    timestamp values against previously cached copy.
  */
 struct ice_ptp_tx {
 	spinlock_t lock; /* lock protecting in_use bitmap */
@@ -142,7 +144,7 @@ struct ice_ptp_tx {
 	u8 len;
 	u8 init : 1;
 	u8 calibrating : 1;
-	u8 verify_cached : 1;
+	u8 has_ready_bitmap : 1;
 };
 
 /* Quad and port information for initializing timestamp blocks */
-- 
2.39.2