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* [dpdk-stable] [PATCH 20.11]] net/bnxt: fix PTP support for Thor
@ 2021-05-18  3:23 Kalesh A P
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From: Kalesh A P @ 2021-05-18  3:23 UTC (permalink / raw)
  To: stable

From: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>

[ upstream commit 53f98141ee9d3a3406fe1281bbc993efd0c06575 ]

On Thor, Rx timestamp is present in the Rx completion record.
Only 32 bits of the timestamp is present in the completion.
The driver needs to periodically poll the current 48 bit
free running timer using the HWRM_PORT_TS_QUERY command.
It can combine the upper 16 bits from the HWRM response
with the lower 32 bits in the Rx completion to produce
the 48 bit timestamp for the Rx packet.

This patch adds an alarm thread to periodically poll the current 48 bit
free running timer using the HWRM_PORT_TS_QUERY command.
This avoids issuing the hwrm command from the Rx handler.
This patch also handles the timer roll over condition.

Fixes: 6cbd89f9f3d8 ("net/bnxt: support PTP for Thor")

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt.h        |  6 ++++
 drivers/net/bnxt/bnxt_ethdev.c | 79 +++++++++++++++++++++++++++++++++++++++++-
 drivers/net/bnxt/bnxt_rxr.c    | 17 +++++----
 3 files changed, 95 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index b912fd8..6a326f1 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -319,6 +319,7 @@ struct rte_flow {
 #define BNXT_PTP_FLAGS_PATH_TX		0x0
 #define BNXT_PTP_FLAGS_PATH_RX		0x1
 #define BNXT_PTP_FLAGS_CURRENT_TIME	0x2
+#define BNXT_PTP_CURRENT_TIME_MASK	0xFFFF00000000ULL
 
 struct bnxt_ptp_cfg {
 #define BNXT_GRCPF_REG_WINDOW_BASE_OUT  0x400
@@ -368,6 +369,7 @@ struct bnxt_ptp_cfg {
 
 	/* On Thor, the Rx timestamp is present in the Rx completion record */
 	uint64_t			rx_timestamp;
+	uint64_t			current_time;
 };
 
 struct bnxt_coal {
@@ -646,6 +648,8 @@ struct bnxt {
 #define BNXT_FLAG_DFLT_MAC_SET			BIT(26)
 #define BNXT_FLAG_TRUFLOW_EN			BIT(27)
 #define BNXT_FLAG_GFID_ENABLE			BIT(28)
+#define BNXT_FLAGS_PTP_TIMESYNC_ENABLED	BIT(29)
+#define BNXT_FLAGS_PTP_ALARM_SCHEDULED		BIT(30)
 #define BNXT_PF(bp)		(!((bp)->flags & BNXT_FLAG_VF))
 #define BNXT_VF(bp)		((bp)->flags & BNXT_FLAG_VF)
 #define BNXT_NPAR(bp)		((bp)->flags & BNXT_FLAG_NPAR_PF)
@@ -662,6 +666,8 @@ struct bnxt {
 #define BNXT_HAS_DFLT_MAC_SET(bp)      ((bp)->flags & BNXT_FLAG_DFLT_MAC_SET)
 #define BNXT_TRUFLOW_EN(bp)	((bp)->flags & BNXT_FLAG_TRUFLOW_EN)
 #define BNXT_GFID_ENABLED(bp)	((bp)->flags & BNXT_FLAG_GFID_ENABLE)
+#define BNXT_THOR_PTP_TIMESYNC_ENABLED(bp)	\
+	((bp)->flags & BNXT_FLAGS_PTP_TIMESYNC_ENABLED)
 
 	uint32_t		fw_cap;
 #define BNXT_FW_CAP_HOT_RESET		BIT(0)
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index 3aa346d..767c116 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -1293,6 +1293,73 @@ static void bnxt_free_switch_domain(struct bnxt *bp)
 	}
 }
 
+static void bnxt_ptp_get_current_time(void *arg)
+{
+	struct bnxt *bp = arg;
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+	int rc;
+
+	rc = is_bnxt_in_error(bp);
+	if (rc)
+		return;
+
+	if (!ptp)
+		return;
+
+	bnxt_hwrm_port_ts_query(bp, BNXT_PTP_FLAGS_CURRENT_TIME,
+				&ptp->current_time);
+
+	rc = rte_eal_alarm_set(US_PER_S, bnxt_ptp_get_current_time, (void *)bp);
+	if (rc != 0) {
+		PMD_DRV_LOG(ERR, "Failed to re-schedule PTP alarm\n");
+		bp->flags &= ~BNXT_FLAGS_PTP_ALARM_SCHEDULED;
+	}
+}
+
+static int bnxt_schedule_ptp_alarm(struct bnxt *bp)
+{
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+	int rc;
+
+	if (bp->flags & BNXT_FLAGS_PTP_ALARM_SCHEDULED)
+		return 0;
+
+	bnxt_hwrm_port_ts_query(bp, BNXT_PTP_FLAGS_CURRENT_TIME,
+				&ptp->current_time);
+
+	rc = rte_eal_alarm_set(US_PER_S, bnxt_ptp_get_current_time, (void *)bp);
+	return rc;
+}
+
+static void bnxt_cancel_ptp_alarm(struct bnxt *bp)
+{
+	if (bp->flags & BNXT_FLAGS_PTP_ALARM_SCHEDULED) {
+		rte_eal_alarm_cancel(bnxt_ptp_get_current_time, (void *)bp);
+		bp->flags &= ~BNXT_FLAGS_PTP_ALARM_SCHEDULED;
+	}
+}
+
+static void bnxt_ptp_stop(struct bnxt *bp)
+{
+	bnxt_cancel_ptp_alarm(bp);
+	bp->flags &= ~BNXT_FLAGS_PTP_TIMESYNC_ENABLED;
+}
+
+static int bnxt_ptp_start(struct bnxt *bp)
+{
+	int rc;
+
+	rc = bnxt_schedule_ptp_alarm(bp);
+	if (rc != 0) {
+		PMD_DRV_LOG(ERR, "Failed to schedule PTP alarm\n");
+	} else {
+		bp->flags |= BNXT_FLAGS_PTP_TIMESYNC_ENABLED;
+		bp->flags |= BNXT_FLAGS_PTP_ALARM_SCHEDULED;
+	}
+
+	return rc;
+}
+
 /* Unload the driver, release resources */
 static int bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
 {
@@ -1324,6 +1391,9 @@ static int bnxt_dev_stop_op(struct rte_eth_dev *eth_dev)
 
 	bnxt_cancel_fw_health_check(bp);
 
+	if (BNXT_THOR_PTP_TIMESYNC_ENABLED(bp))
+		bnxt_cancel_ptp_alarm(bp);
+
 	/* Do not bring link down during reset recovery */
 	if (!is_bnxt_in_error(bp)) {
 		bnxt_dev_set_link_down_op(eth_dev);
@@ -1426,6 +1496,9 @@ static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev)
 
 	bnxt_schedule_fw_health_check(bp);
 
+	if (BNXT_THOR_PTP_TIMESYNC_ENABLED(bp))
+		bnxt_schedule_ptp_alarm(bp);
+
 	return 0;
 
 error:
@@ -3290,8 +3363,10 @@ bnxt_timesync_enable(struct rte_eth_dev *dev)
 
 	if (!BNXT_CHIP_THOR(bp))
 		bnxt_map_ptp_regs(bp);
+	else
+		rc = bnxt_ptp_start(bp);
 
-	return 0;
+	return rc;
 }
 
 static int
@@ -3311,6 +3386,8 @@ bnxt_timesync_disable(struct rte_eth_dev *dev)
 
 	if (!BNXT_CHIP_THOR(bp))
 		bnxt_unmap_ptp_regs(bp);
+	else
+		bnxt_ptp_stop(bp);
 
 	return 0;
 }
diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
index b28b7fb..bdb6252 100644
--- a/drivers/net/bnxt/bnxt_rxr.c
+++ b/drivers/net/bnxt/bnxt_rxr.c
@@ -539,9 +539,11 @@ bnxt_set_ol_flags(struct bnxt_rx_ring_info *rxr, struct rx_pkt_cmpl *rxcmp,
 static void
 bnxt_get_rx_ts_thor(struct bnxt *bp, uint32_t rx_ts_cmpl)
 {
-	uint64_t systime_cycles = 0;
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+	uint64_t last_hwrm_time;
+	uint64_t pkt_time = 0;
 
-	if (!BNXT_CHIP_THOR(bp))
+	if (!BNXT_CHIP_THOR(bp) || !ptp)
 		return;
 
 	/* On Thor, Rx timestamps are provided directly in the
@@ -552,10 +554,13 @@ bnxt_get_rx_ts_thor(struct bnxt *bp, uint32_t rx_ts_cmpl)
 	 * from the HWRM response with the lower 32 bits in the
 	 * Rx completion to produce the 48 bit timestamp for the Rx packet
 	 */
-	bnxt_hwrm_port_ts_query(bp, BNXT_PTP_FLAGS_CURRENT_TIME,
-				&systime_cycles);
-	bp->ptp_cfg->rx_timestamp = (systime_cycles & 0xFFFF00000000);
-	bp->ptp_cfg->rx_timestamp |= rx_ts_cmpl;
+	last_hwrm_time = ptp->current_time;
+	pkt_time = (last_hwrm_time & BNXT_PTP_CURRENT_TIME_MASK) | rx_ts_cmpl;
+	if (rx_ts_cmpl < (uint32_t)last_hwrm_time) {
+		/* timer has rolled over */
+		pkt_time += (1ULL << 32);
+	}
+	ptp->rx_timestamp = pkt_time;
 }
 #endif
 
-- 
2.10.1


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2021-05-18  3:23 [dpdk-stable] [PATCH 20.11]] net/bnxt: fix PTP support for Thor Kalesh A P

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